Add ETC1/ETC2 compression support though etc2comp.

Remove rg-etc1 code. Also updated travis to use ubuntu 14.04.

Fixes #8457.
This commit is contained in:
Ferenc Arn 2017-04-26 10:49:08 -05:00
parent bd26fa7bf2
commit 6a9c990da7
61 changed files with 12981 additions and 2765 deletions

View file

@ -1,5 +1,7 @@
language: cpp language: cpp
dist: trusty
sudo: false sudo: false
compiler: compiler:
@ -73,7 +75,6 @@ addons:
# For style checks. # For style checks.
- clang-format-3.9 - clang-format-3.9
before_script: before_script:
- if [ "$TRAVIS_OS_NAME" = "osx" ]; then brew update; brew install scons; fi - if [ "$TRAVIS_OS_NAME" = "osx" ]; then brew update; brew install scons; fi
- if [ "$TRAVIS_OS_NAME" = "osx" ] && [ "$GODOT_TARGET" = "android" ]; then - if [ "$TRAVIS_OS_NAME" = "osx" ] && [ "$GODOT_TARGET" = "android" ]; then
@ -86,5 +87,9 @@ script:
- if [ "$STATIC_CHECKS" = "yes" ]; then - if [ "$STATIC_CHECKS" = "yes" ]; then
sh ./misc/travis/clang-format.sh; sh ./misc/travis/clang-format.sh;
else else
scons platform=$GODOT_TARGET CXX=$CXX openssl=builtin; if [ "$TRAVIS_OS_NAME" = "windows" ]; then
scons platform=$GODOT_TARGET CXX=$CXX openssl=builtin;
else
scons platform=$GODOT_TARGET bits=64 CXX=$CXX openssl=builtin;
fi
fi fi

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@ -1483,16 +1483,16 @@ Error Image::decompress() {
_image_decompress_bc(this); _image_decompress_bc(this);
else if (format >= FORMAT_PVRTC2 && format <= FORMAT_PVRTC4A && _image_decompress_pvrtc) else if (format >= FORMAT_PVRTC2 && format <= FORMAT_PVRTC4A && _image_decompress_pvrtc)
_image_decompress_pvrtc(this); _image_decompress_pvrtc(this);
else if (format == FORMAT_ETC && _image_decompress_etc) else if (format == FORMAT_ETC && _image_decompress_etc1)
_image_decompress_etc(this); _image_decompress_etc1(this);
else if (format >= FORMAT_ETC2_R11 && format <= FORMAT_ETC2_RGB8A1 && _image_decompress_etc) else if (format >= FORMAT_ETC2_R11 && format <= FORMAT_ETC2_RGB8A1 && _image_decompress_etc1)
_image_decompress_etc2(this); _image_decompress_etc2(this);
else else
return ERR_UNAVAILABLE; return ERR_UNAVAILABLE;
return OK; return OK;
} }
Error Image::compress(CompressMode p_mode, bool p_for_srgb) { Error Image::compress(CompressMode p_mode, bool p_for_srgb, float p_lossy_quality) {
switch (p_mode) { switch (p_mode) {
@ -1513,13 +1513,13 @@ Error Image::compress(CompressMode p_mode, bool p_for_srgb) {
} break; } break;
case COMPRESS_ETC: { case COMPRESS_ETC: {
ERR_FAIL_COND_V(!_image_compress_etc_func, ERR_UNAVAILABLE); ERR_FAIL_COND_V(!_image_compress_etc1_func, ERR_UNAVAILABLE);
_image_compress_etc_func(this); _image_compress_etc1_func(this, p_lossy_quality);
} break; } break;
case COMPRESS_ETC2: { case COMPRESS_ETC2: {
ERR_FAIL_COND_V(!_image_compress_etc_func, ERR_UNAVAILABLE); ERR_FAIL_COND_V(!_image_compress_etc2_func, ERR_UNAVAILABLE);
_image_compress_etc_func(this); _image_compress_etc2_func(this, p_lossy_quality);
} break; } break;
} }
@ -1652,11 +1652,11 @@ Ref<Image> (*Image::_jpg_mem_loader_func)(const uint8_t *, int) = NULL;
void (*Image::_image_compress_bc_func)(Image *, bool) = NULL; void (*Image::_image_compress_bc_func)(Image *, bool) = NULL;
void (*Image::_image_compress_pvrtc2_func)(Image *) = NULL; void (*Image::_image_compress_pvrtc2_func)(Image *) = NULL;
void (*Image::_image_compress_pvrtc4_func)(Image *) = NULL; void (*Image::_image_compress_pvrtc4_func)(Image *) = NULL;
void (*Image::_image_compress_etc_func)(Image *) = NULL; void (*Image::_image_compress_etc1_func)(Image *, float) = NULL;
void (*Image::_image_compress_etc2_func)(Image *) = NULL; void (*Image::_image_compress_etc2_func)(Image *, float) = NULL;
void (*Image::_image_decompress_pvrtc)(Image *) = NULL; void (*Image::_image_decompress_pvrtc)(Image *) = NULL;
void (*Image::_image_decompress_bc)(Image *) = NULL; void (*Image::_image_decompress_bc)(Image *) = NULL;
void (*Image::_image_decompress_etc)(Image *) = NULL; void (*Image::_image_decompress_etc1)(Image *) = NULL;
void (*Image::_image_decompress_etc2)(Image *) = NULL; void (*Image::_image_decompress_etc2)(Image *) = NULL;
PoolVector<uint8_t> (*Image::lossy_packer)(const Ref<Image> &, float) = NULL; PoolVector<uint8_t> (*Image::lossy_packer)(const Ref<Image> &, float) = NULL;

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@ -117,12 +117,12 @@ public:
static void (*_image_compress_bc_func)(Image *, bool p_srgb); static void (*_image_compress_bc_func)(Image *, bool p_srgb);
static void (*_image_compress_pvrtc2_func)(Image *); static void (*_image_compress_pvrtc2_func)(Image *);
static void (*_image_compress_pvrtc4_func)(Image *); static void (*_image_compress_pvrtc4_func)(Image *);
static void (*_image_compress_etc_func)(Image *); static void (*_image_compress_etc1_func)(Image *, float);
static void (*_image_compress_etc2_func)(Image *); static void (*_image_compress_etc2_func)(Image *, float);
static void (*_image_decompress_pvrtc)(Image *); static void (*_image_decompress_pvrtc)(Image *);
static void (*_image_decompress_bc)(Image *); static void (*_image_decompress_bc)(Image *);
static void (*_image_decompress_etc)(Image *); static void (*_image_decompress_etc1)(Image *);
static void (*_image_decompress_etc2)(Image *); static void (*_image_decompress_etc2)(Image *);
static PoolVector<uint8_t> (*lossy_packer)(const Ref<Image> &p_image, float p_quality); static PoolVector<uint8_t> (*lossy_packer)(const Ref<Image> &p_image, float p_quality);
@ -267,7 +267,7 @@ public:
COMPRESS_ETC2, COMPRESS_ETC2,
}; };
Error compress(CompressMode p_mode = COMPRESS_S3TC, bool p_for_srgb = false); Error compress(CompressMode p_mode = COMPRESS_S3TC, bool p_for_srgb = false, float p_lossy_quality = 0.7);
Error decompress(); Error decompress();
bool is_compressed() const; bool is_compressed() const;

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@ -112,6 +112,15 @@ public:
static _ALWAYS_INLINE_ bool is_inf(double p_val) { static _ALWAYS_INLINE_ bool is_inf(double p_val) {
#ifdef _MSC_VER #ifdef _MSC_VER
return !_finite(p_val); return !_finite(p_val);
// workaround for mingw builds on travis
#elif defined(__MINGW32__) || defined(__MINGW64__)
union {
uint64_t u;
double f;
} ieee754;
ieee754.f = p_val;
return ((unsigned)(ieee754.u >> 32) & 0x7fffffff) == 0x7ff00000 &&
((unsigned)ieee754.u == 0);
#else #else
return isinf(p_val); return isinf(p_val);
#endif #endif
@ -120,6 +129,14 @@ public:
static _ALWAYS_INLINE_ bool is_inf(float p_val) { static _ALWAYS_INLINE_ bool is_inf(float p_val) {
#ifdef _MSC_VER #ifdef _MSC_VER
return !_finite(p_val); return !_finite(p_val);
// workaround for mingw builds on travis
#elif defined(__MINGW32__) || defined(__MINGW64__)
union {
uint32_t u;
float f;
} ieee754;
ieee754.f = p_val;
return (ieee754.u & 0x7fffffff) == 0x7f800000;
#else #else
return isinf(p_val); return isinf(p_val);
#endif #endif

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@ -18490,8 +18490,10 @@
</return> </return>
<argument index="0" name="format" type="int" default="0"> <argument index="0" name="format" type="int" default="0">
</argument> </argument>
<argument index="0" name="quality" type="float" default="0">
</argument>
<description> <description>
Return a new compressed [Image] from this [Image] using one of [Image].COMPRESS_*. Return a new compressed [Image] from this [Image] using one of [Image].COMPRESS_*. Quality only affects ETC1 and ETC2 encoding.
</description> </description>
</method> </method>
<method name="converted"> <method name="converted">

View file

@ -144,8 +144,12 @@ String ResourceImporterTexture::get_resource_type() const {
bool ResourceImporterTexture::get_option_visibility(const String &p_option, const Map<StringName, Variant> &p_options) const { bool ResourceImporterTexture::get_option_visibility(const String &p_option, const Map<StringName, Variant> &p_options) const {
if (p_option == "compress/lossy_quality" && int(p_options["compress/mode"]) != COMPRESS_LOSSY) if (p_option == "compress/lossy_quality") {
return false; int compress_mode = int(p_options["compress/mode"]);
if (compress_mode != COMPRESS_LOSSY && compress_mode != COMPRESS_VIDEO_RAM) {
return false;
}
}
return true; return true;
} }
@ -277,7 +281,7 @@ void ResourceImporterTexture::_save_stex(const Ref<Image> &p_image, const String
if (p_force_rgbe && image->get_format() >= Image::FORMAT_R8 && image->get_format() <= Image::FORMAT_RGBE9995) { if (p_force_rgbe && image->get_format() >= Image::FORMAT_R8 && image->get_format() <= Image::FORMAT_RGBE9995) {
image->convert(Image::FORMAT_RGBE9995); image->convert(Image::FORMAT_RGBE9995);
} else { } else {
image->compress(p_vram_compression, p_texture_flags & VS::TEXTURE_FLAG_CONVERT_TO_LINEAR); image->compress(p_vram_compression, p_texture_flags & VS::TEXTURE_FLAG_CONVERT_TO_LINEAR, p_lossy_quality);
} }
format |= image->get_format(); format |= image->get_format();
@ -382,8 +386,8 @@ Error ResourceImporterTexture::import(const String &p_source_file, const String
//Android, GLES 2.x //Android, GLES 2.x
_save_stex(image, p_save_path + ".etc.stex", compress_mode, lossy, Image::COMPRESS_ETC, mipmaps, tex_flags, stream, detect_3d, detect_srgb, force_rgbe); _save_stex(image, p_save_path + ".etc.stex", compress_mode, lossy, Image::COMPRESS_ETC, mipmaps, tex_flags, stream, detect_3d, detect_srgb, force_rgbe);
r_platform_variants->push_back("etc"); r_platform_variants->push_back("etc");
//_save_stex(image,p_save_path+".etc2.stex",compress_mode,lossy,Image::COMPRESS_ETC2,mipmaps,tex_flags,stream); _save_stex(image, p_save_path + ".etc2.stex", compress_mode, lossy, Image::COMPRESS_ETC2, mipmaps, tex_flags, stream, detect_3d, detect_srgb, force_rgbe);
//r_platform_variants->push_back("etc2"); r_platform_variants->push_back("etc2");
_save_stex(image, p_save_path + ".s3tc.stex", compress_mode, lossy, Image::COMPRESS_S3TC, mipmaps, tex_flags, stream, detect_3d, detect_srgb, force_rgbe); _save_stex(image, p_save_path + ".s3tc.stex", compress_mode, lossy, Image::COMPRESS_S3TC, mipmaps, tex_flags, stream, detect_3d, detect_srgb, force_rgbe);
r_platform_variants->push_back("s3tc"); r_platform_variants->push_back("s3tc");

37
modules/etc/SCsub Normal file
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@ -0,0 +1,37 @@
#!/usr/bin/env python
Import('env')
Import('env_modules')
env_etc = env_modules.Clone()
# Thirdparty source files
# Not unbundled so far since not widespread as shared library
thirdparty_dir = "#thirdparty/etc2comp/"
thirdparty_sources = [
"EtcBlock4x4.cpp",
"EtcBlock4x4Encoding.cpp",
"EtcBlock4x4Encoding_ETC1.cpp",
"EtcBlock4x4Encoding_R11.cpp",
"EtcBlock4x4Encoding_RG11.cpp",
"EtcBlock4x4Encoding_RGB8A1.cpp",
"EtcBlock4x4Encoding_RGB8.cpp",
"EtcBlock4x4Encoding_RGBA8.cpp",
"Etc.cpp",
"EtcDifferentialTrys.cpp",
"EtcFilter.cpp",
"EtcImage.cpp",
"EtcIndividualTrys.cpp",
"EtcMath.cpp",
"EtcSortedBlockList.cpp",
]
thirdparty_sources = [thirdparty_dir + file for file in thirdparty_sources]
env_etc.add_source_files(env.modules_sources, thirdparty_sources)
env_etc.Append(CPPPATH=[thirdparty_dir])
# Godot source files
env_etc.add_source_files(env.modules_sources, "*.cpp")
# upstream uses c++11
env_etc.Append(CXXFLAGS="-std=gnu++11")

181
modules/etc/image_etc.cpp Normal file
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@ -0,0 +1,181 @@
/*************************************************************************/
/* image_etc.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* http://www.godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2017 Godot Engine contributors (cf. AUTHORS.md) */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "image_etc.h"
#include "Etc.h"
#include "EtcFilter.h"
#include "image.h"
#include "os/copymem.h"
#include "os/os.h"
#include "print_string.h"
static Image::Format _get_etc2_mode(Image::DetectChannels format) {
switch (format) {
case Image::DETECTED_L:
case Image::DETECTED_R:
return Image::FORMAT_ETC2_R11;
case Image::DETECTED_RG:
return Image::FORMAT_ETC2_RG11;
case Image::DETECTED_RGB:
return Image::FORMAT_ETC2_RGB8;
case Image::DETECTED_RGBA:
return Image::FORMAT_ETC2_RGBA8;
// TODO: would be nice if we could use FORMAT_ETC2_RGB8A1 for FORMAT_RGBA5551
}
ERR_FAIL_COND_V(true, Image::FORMAT_MAX);
}
static Etc::Image::Format _image_format_to_etc2comp_format(Image::Format format) {
switch (format) {
case Image::FORMAT_ETC:
return Etc::Image::Format::ETC1;
case Image::FORMAT_ETC2_R11:
return Etc::Image::Format::R11;
case Image::FORMAT_ETC2_R11S:
return Etc::Image::Format::SIGNED_R11;
case Image::FORMAT_ETC2_RG11:
return Etc::Image::Format::RG11;
case Image::FORMAT_ETC2_RG11S:
return Etc::Image::Format::SIGNED_RG11;
case Image::FORMAT_ETC2_RGB8:
return Etc::Image::Format::RGB8;
case Image::FORMAT_ETC2_RGBA8:
return Etc::Image::Format::RGBA8;
case Image::FORMAT_ETC2_RGB8A1:
return Etc::Image::Format::RGB8A1;
}
ERR_FAIL_COND_V(true, Etc::Image::Format::UNKNOWN);
}
static void _decompress_etc1(Image *p_img) {
// not implemented, to be removed
}
static void _decompress_etc2(Image *p_img) {
// not implemented, to be removed
}
static void _compress_etc(Image *p_img, float p_lossy_quality, bool force_etc1_format) {
Image::Format img_format = p_img->get_format();
Image::DetectChannels detected_channels = p_img->get_detected_channels();
if (img_format >= Image::FORMAT_DXT1) {
return; //do not compress, already compressed
}
if (img_format > Image::FORMAT_RGBA8) {
// TODO: we should be able to handle FORMAT_RGBA4444 and FORMAT_RGBA5551 eventually
return;
}
int imgw = p_img->get_width(), imgh = p_img->get_height();
ERR_FAIL_COND(nearest_power_of_2(imgw) != imgw || nearest_power_of_2(imgh) != imgh);
Image::Format etc_format = force_etc1_format ? Image::FORMAT_ETC : _get_etc2_mode(detected_channels);
Ref<Image> img = p_img->duplicate();
if (img->get_format() != Image::FORMAT_RGBA8)
img->convert(Image::FORMAT_RGBA8); //still uses RGBA to convert
PoolVector<uint8_t>::Read r = img->get_data().read();
int target_size = Image::get_image_data_size(imgw, imgh, etc_format, p_img->has_mipmaps() ? -1 : 0);
int mmc = p_img->has_mipmaps() ? Image::get_image_required_mipmaps(imgw, imgh, etc_format) : 0;
PoolVector<uint8_t> dst_data;
dst_data.resize(target_size);
PoolVector<uint8_t>::Write w = dst_data.write();
// prepare parameters to be passed to etc2comp
int num_cpus = OS::get_singleton()->get_processor_count();
int encoding_time = 0;
float effort = CLAMP(p_lossy_quality * 100, 0, 100);
Etc::ErrorMetric error_metric = Etc::ErrorMetric::BT709; // NOTE: we can experiment with other error metrics
Etc::Image::Format etc2comp_etc_format = _image_format_to_etc2comp_format(etc_format);
int wofs = 0;
for (int i = 0; i < mmc + 1; i++) {
// convert source image to internal etc2comp format (which is equivalent to Image::FORMAT_RGBAF)
// NOTE: We can alternatively add a case to Image::convert to handle Image::FORMAT_RGBAF conversion.
int mipmap_ofs = 0, mipmap_size = 0, mipmap_w = 0, mipmap_h = 0;
img->get_mipmap_offset_size_and_dimensions(i, mipmap_ofs, mipmap_size, mipmap_w, mipmap_h);
const uint8_t *src = &r[mipmap_ofs];
Etc::ColorFloatRGBA *src_rgba_f = new Etc::ColorFloatRGBA[mipmap_w * mipmap_h];
for (int i = 0; i < mipmap_w * mipmap_h; i++) {
int si = i * 4; // RGBA8
src_rgba_f[i] = Etc::ColorFloatRGBA::ConvertFromRGBA8(src[si], src[si + 1], src[si + 2], src[si + 3]);
}
unsigned char *etc_data = NULL;
unsigned int etc_data_len = 0;
unsigned int extended_width = 0, extended_height = 0;
Etc::Encode((float *)src_rgba_f, mipmap_w, mipmap_h, etc2comp_etc_format, error_metric, effort, num_cpus, num_cpus, &etc_data, &etc_data_len, &extended_width, &extended_height, &encoding_time);
memcpy(&w[wofs], etc_data, etc_data_len);
wofs += etc_data_len;
delete[] etc_data;
delete[] src_rgba_f;
}
p_img->create(imgw, imgh, mmc > 1 ? true : false, etc_format, dst_data);
}
static void _compress_etc1(Image *p_img, float p_lossy_quality) {
_compress_etc(p_img, p_lossy_quality, true);
}
static void _compress_etc2(Image *p_img, float p_lossy_quality) {
_compress_etc(p_img, p_lossy_quality, false);
}
void _register_etc_compress_func() {
Image::_image_compress_etc1_func = _compress_etc1;
//Image::_image_decompress_etc1 = _decompress_etc1;
Image::_image_compress_etc2_func = _compress_etc2;
//Image::_image_decompress_etc2 = _decompress_etc2;
}

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@ -30,6 +30,6 @@
#ifndef IMAGE_ETC1_H #ifndef IMAGE_ETC1_H
#define IMAGE_ETC1_H #define IMAGE_ETC1_H
void _register_etc1_compress_func(); void _register_etc_compress_func();
#endif // IMAGE_ETC_H #endif // IMAGE_ETC_H

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@ -34,15 +34,15 @@
static ResourceFormatPKM *resource_loader_pkm = NULL; static ResourceFormatPKM *resource_loader_pkm = NULL;
void register_etc1_types() { void register_etc_types() {
resource_loader_pkm = memnew(ResourceFormatPKM); resource_loader_pkm = memnew(ResourceFormatPKM);
ResourceLoader::add_resource_format_loader(resource_loader_pkm); ResourceLoader::add_resource_format_loader(resource_loader_pkm);
_register_etc1_compress_func(); _register_etc_compress_func();
} }
void unregister_etc1_types() { void unregister_etc_types() {
memdelete(resource_loader_pkm); memdelete(resource_loader_pkm);
} }

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@ -27,5 +27,5 @@
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */ /* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/ /*************************************************************************/
void register_etc1_types(); void register_etc_types();
void unregister_etc1_types(); void unregister_etc_types();

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@ -1,20 +0,0 @@
#!/usr/bin/env python
Import('env')
Import('env_modules')
env_etc1 = env_modules.Clone()
# Thirdparty source files
# Not unbundled so far since not widespread as shared library
thirdparty_dir = "#thirdparty/rg-etc1/"
thirdparty_sources = [
"rg_etc1.cpp",
]
thirdparty_sources = [thirdparty_dir + file for file in thirdparty_sources]
env_etc1.add_source_files(env.modules_sources, thirdparty_sources)
env_etc1.Append(CPPPATH=[thirdparty_dir])
# Godot source files
env_etc1.add_source_files(env.modules_sources, "*.cpp")

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@ -1,183 +0,0 @@
/*************************************************************************/
/* image_etc.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* http://www.godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2017 Godot Engine contributors (cf. AUTHORS.md) */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "image_etc.h"
#include "image.h"
#include "os/copymem.h"
#include "print_string.h"
#include "rg_etc1.h"
static void _decompress_etc(Image *p_img) {
ERR_FAIL_COND(p_img->get_format() != Image::FORMAT_ETC);
int imgw = p_img->get_width();
int imgh = p_img->get_height();
PoolVector<uint8_t> src = p_img->get_data();
PoolVector<uint8_t> dst;
PoolVector<uint8_t>::Read r = src.read();
int mmc = p_img->get_mipmap_count();
for (int i = 0; i <= mmc; i++) {
dst.resize(dst.size() + imgw * imgh * 3);
const uint8_t *srcbr = &r[p_img->get_mipmap_offset(i)];
PoolVector<uint8_t>::Write w = dst.write();
uint8_t *wptr = &w[dst.size() - imgw * imgh * 3];
int bw = MAX(imgw / 4, 1);
int bh = MAX(imgh / 4, 1);
for (int y = 0; y < bh; y++) {
for (int x = 0; x < bw; x++) {
uint8_t block[4 * 4 * 4];
rg_etc1::unpack_etc1_block(srcbr, (unsigned int *)block);
srcbr += 8;
int maxx = MIN(imgw, 4);
int maxy = MIN(imgh, 4);
for (int yy = 0; yy < maxy; yy++) {
for (int xx = 0; xx < maxx; xx++) {
uint32_t src_ofs = (yy * 4 + xx) * 4;
uint32_t dst_ofs = ((y * 4 + yy) * imgw + x * 4 + xx) * 3;
wptr[dst_ofs + 0] = block[src_ofs + 0];
wptr[dst_ofs + 1] = block[src_ofs + 1];
wptr[dst_ofs + 2] = block[src_ofs + 2];
}
}
}
}
imgw = MAX(1, imgw / 2);
imgh = MAX(1, imgh / 2);
}
r = PoolVector<uint8_t>::Read();
//print_line("Re Creating ETC into regular image: w "+itos(p_img->get_width())+" h "+itos(p_img->get_height())+" mm "+itos(p_img->get_mipmaps()));
bool needs_mipmaps = p_img->has_mipmaps();
p_img->create(p_img->get_width(), p_img->get_height(), p_img->has_mipmaps(), Image::FORMAT_RGB8, dst);
if (needs_mipmaps)
p_img->generate_mipmaps();
}
static void _compress_etc(Image *p_img) {
Ref<Image> img = p_img->duplicate();
int imgw = img->get_width(), imgh = img->get_height();
ERR_FAIL_COND(nearest_power_of_2(imgw) != imgw || nearest_power_of_2(imgh) != imgh);
if (img->get_format() != Image::FORMAT_RGB8)
img->convert(Image::FORMAT_RGB8);
PoolVector<uint8_t> res_data;
PoolVector<uint8_t> dst_data;
PoolVector<uint8_t>::Read r = img->get_data().read();
int target_size = Image::get_image_data_size(p_img->get_width(), p_img->get_height(), Image::FORMAT_ETC, p_img->has_mipmaps() ? -1 : 0);
int mmc = p_img->has_mipmaps() ? Image::get_image_required_mipmaps(p_img->get_width(), p_img->get_height(), Image::FORMAT_ETC) : 0;
dst_data.resize(target_size);
int mc = 0;
int ofs = 0;
PoolVector<uint8_t>::Write w = dst_data.write();
rg_etc1::etc1_pack_params pp;
pp.m_quality = rg_etc1::cLowQuality;
for (int i = 0; i <= mmc; i++) {
int bw = MAX(imgw / 4, 1);
int bh = MAX(imgh / 4, 1);
const uint8_t *src = &r[img->get_mipmap_offset(i)];
int mmsize = MAX(bw, 1) * MAX(bh, 1) * 8;
uint8_t *dst = &w[ofs];
ofs += mmsize;
//print_line("bh: "+itos(bh)+" bw: "+itos(bw));
for (int y = 0; y < bh; y++) {
for (int x = 0; x < bw; x++) {
//print_line("x: "+itos(x)+" y: "+itos(y));
uint8_t block[4 * 4 * 4];
zeromem(block, 4 * 4 * 4);
uint8_t cblock[8];
int maxy = MIN(imgh, 4);
int maxx = MIN(imgw, 4);
for (int yy = 0; yy < maxy; yy++) {
for (int xx = 0; xx < maxx; xx++) {
uint32_t dst_ofs = (yy * 4 + xx) * 4;
uint32_t src_ofs = ((y * 4 + yy) * imgw + x * 4 + xx) * 3;
block[dst_ofs + 0] = src[src_ofs + 0];
block[dst_ofs + 1] = src[src_ofs + 1];
block[dst_ofs + 2] = src[src_ofs + 2];
block[dst_ofs + 3] = 255;
}
}
rg_etc1::pack_etc1_block(cblock, (const unsigned int *)block, pp);
for (int j = 0; j < 8; j++) {
dst[j] = cblock[j];
}
dst += 8;
}
}
imgw = MAX(1, imgw / 2);
imgh = MAX(1, imgh / 2);
mc++;
}
p_img->create(p_img->get_width(), p_img->get_height(), (mc - 1) ? true : false, Image::FORMAT_ETC, dst_data);
}
void _register_etc1_compress_func() {
rg_etc1::pack_etc1_block_init();
Image::_image_compress_etc_func = _compress_etc;
Image::_image_decompress_etc = _decompress_etc;
}

23
thirdparty/README.md vendored
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@ -37,6 +37,18 @@ Check the diff of enet.h, protocol.c, and host.c with the 1.3.13
tarball before the next update. tarball before the next update.
## etc2comp
- Upstream: https://github.com/google/etc2comp
- Version: 9cd0f9c (git)
- License: Apache
Files extracted from upstream source:
- all .cpp and .h files in EtcLib/
- README.md, LICENSE, AUTHORS
## fonts ## fonts
- Upstream: ? - Upstream: ?
@ -296,17 +308,6 @@ Files extracted from upstream source:
- LICENSE.TXT - LICENSE.TXT
## rg-etc1
- Upstream: https://github.com/richgel999/rg-etc1
- Version: 1.04
- License: zlib
Files extracted from upstream source:
- `rg_etc1.{cpp,h}`
## rtaudio ## rtaudio
- Upstream: http://www.music.mcgill.ca/~gary/rtaudio/ - Upstream: http://www.music.mcgill.ca/~gary/rtaudio/

7
thirdparty/etc2comp/AUTHORS vendored Normal file
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@ -0,0 +1,7 @@
# This is the list of Etc2Comp authors for copyright purposes.
#
# This does not necessarily list everyone who has contributed code, since in
# some cases, their employer may be the copyright holder. To see the full list
# of contributors, see the revision history in source control.
Google Inc.
Blue Shift Inc.

128
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@ -0,0 +1,128 @@
/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "EtcConfig.h"
#include "Etc.h"
#include "EtcFilter.h"
#include <string.h>
namespace Etc
{
// ----------------------------------------------------------------------------------------------------
// C-style inteface to the encoder
//
void Encode(float *a_pafSourceRGBA,
unsigned int a_uiSourceWidth,
unsigned int a_uiSourceHeight,
Image::Format a_format,
ErrorMetric a_eErrMetric,
float a_fEffort,
unsigned int a_uiJobs,
unsigned int a_uiMaxJobs,
unsigned char **a_ppaucEncodingBits,
unsigned int *a_puiEncodingBitsBytes,
unsigned int *a_puiExtendedWidth,
unsigned int *a_puiExtendedHeight,
int *a_piEncodingTime_ms, bool a_bVerboseOutput)
{
Image image(a_pafSourceRGBA, a_uiSourceWidth,
a_uiSourceHeight,
a_eErrMetric);
image.m_bVerboseOutput = a_bVerboseOutput;
image.Encode(a_format, a_eErrMetric, a_fEffort, a_uiJobs, a_uiMaxJobs);
*a_ppaucEncodingBits = image.GetEncodingBits();
*a_puiEncodingBitsBytes = image.GetEncodingBitsBytes();
*a_puiExtendedWidth = image.GetExtendedWidth();
*a_puiExtendedHeight = image.GetExtendedHeight();
*a_piEncodingTime_ms = image.GetEncodingTimeMs();
}
void EncodeMipmaps(float *a_pafSourceRGBA,
unsigned int a_uiSourceWidth,
unsigned int a_uiSourceHeight,
Image::Format a_format,
ErrorMetric a_eErrMetric,
float a_fEffort,
unsigned int a_uiJobs,
unsigned int a_uiMaxJobs,
unsigned int a_uiMaxMipmaps,
unsigned int a_uiMipFilterFlags,
RawImage* a_pMipmapImages,
int *a_piEncodingTime_ms,
bool a_bVerboseOutput)
{
auto mipWidth = a_uiSourceWidth;
auto mipHeight = a_uiSourceHeight;
int totalEncodingTime = 0;
for(unsigned int mip = 0; mip < a_uiMaxMipmaps && mipWidth >= 1 && mipHeight >= 1; mip++)
{
float* pImageData = nullptr;
float* pMipImage = nullptr;
if(mip == 0)
{
pImageData = a_pafSourceRGBA;
}
else
{
pMipImage = new float[mipWidth*mipHeight*4];
if(FilterTwoPass(a_pafSourceRGBA, a_uiSourceWidth, a_uiSourceHeight, pMipImage, mipWidth, mipHeight, a_uiMipFilterFlags, Etc::FilterLanczos3) )
{
pImageData = pMipImage;
}
}
if ( pImageData )
{
Image image(pImageData, mipWidth, mipHeight, a_eErrMetric);
image.m_bVerboseOutput = a_bVerboseOutput;
image.Encode(a_format, a_eErrMetric, a_fEffort, a_uiJobs, a_uiMaxJobs);
a_pMipmapImages[mip].paucEncodingBits = std::shared_ptr<unsigned char>(image.GetEncodingBits(), [](unsigned char *p) { delete[] p; });
a_pMipmapImages[mip].uiEncodingBitsBytes = image.GetEncodingBitsBytes();
a_pMipmapImages[mip].uiExtendedWidth = image.GetExtendedWidth();
a_pMipmapImages[mip].uiExtendedHeight = image.GetExtendedHeight();
totalEncodingTime += image.GetEncodingTimeMs();
}
if(pMipImage)
{
delete[] pMipImage;
}
if (!pImageData)
{
break;
}
mipWidth >>= 1;
mipHeight >>= 1;
}
*a_piEncodingTime_ms = totalEncodingTime;
}
// ----------------------------------------------------------------------------------------------------
//
}

71
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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include "EtcConfig.h"
#include "EtcImage.h"
#include "EtcColor.h"
#include "EtcErrorMetric.h"
#include <memory>
#define ETCCOMP_MIN_EFFORT_LEVEL (0.0f)
#define ETCCOMP_DEFAULT_EFFORT_LEVEL (40.0f)
#define ETCCOMP_MAX_EFFORT_LEVEL (100.0f)
namespace Etc
{
class Block4x4EncodingBits;
struct RawImage
{
int uiExtendedWidth;
int uiExtendedHeight;
unsigned int uiEncodingBitsBytes;
std::shared_ptr<unsigned char> paucEncodingBits;
};
// C-style inteface to the encoder
void Encode(float *a_pafSourceRGBA,
unsigned int a_uiSourceWidth,
unsigned int a_uiSourceHeight,
Image::Format a_format,
ErrorMetric a_eErrMetric,
float a_fEffort,
unsigned int a_uiJobs,
unsigned int a_uimaxJobs,
unsigned char **a_ppaucEncodingBits,
unsigned int *a_puiEncodingBitsBytes,
unsigned int *a_puiExtendedWidth,
unsigned int *a_puiExtendedHeight,
int *a_piEncodingTime_ms, bool a_bVerboseOutput = false);
void EncodeMipmaps(float *a_pafSourceRGBA,
unsigned int a_uiSourceWidth,
unsigned int a_uiSourceHeight,
Image::Format a_format,
ErrorMetric a_eErrMetric,
float a_fEffort,
unsigned int a_uiJobs,
unsigned int a_uiMaxJobs,
unsigned int a_uiMaxMipmaps,
unsigned int a_uiMipFilterFlags,
RawImage* a_pMipmaps,
int *a_piEncodingTime_ms, bool a_bVerboseOutput = false);
}

425
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@ -0,0 +1,425 @@
/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
EtcBlock4x4.cpp
Implements the state associated with each 4x4 block of pixels in an image
Source images that are not a multiple of 4x4 are extended to fill the Block4x4 using pixels with an
alpha of NAN
*/
#include "EtcConfig.h"
#include "EtcBlock4x4.h"
#include "EtcBlock4x4EncodingBits.h"
#include "EtcColor.h"
#include "EtcImage.h"
#include "EtcColorFloatRGBA.h"
#include "EtcBlock4x4Encoding_RGB8.h"
#include "EtcBlock4x4Encoding_RGBA8.h"
#include "EtcBlock4x4Encoding_RGB8A1.h"
#include "EtcBlock4x4Encoding_R11.h"
#include "EtcBlock4x4Encoding_RG11.h"
#include <stdio.h>
#include <string.h>
#include <assert.h>
namespace Etc
{
// ETC pixels are scanned vertically.
// this mapping is for when someone wants to scan the ETC pixels horizontally
const unsigned int Block4x4::s_auiPixelOrderHScan[PIXELS] = { 0, 4, 8, 12, 1, 5, 9, 13, 2, 6, 10, 14, 3, 7, 11, 15 };
// ----------------------------------------------------------------------------------------------------
//
Block4x4::Block4x4(void)
{
m_pimageSource = nullptr;
m_uiSourceH = 0;
m_uiSourceV = 0;
m_sourcealphamix = SourceAlphaMix::UNKNOWN;
m_boolBorderPixels = false;
m_boolPunchThroughPixels = false;
m_pencoding = nullptr;
m_errormetric = ErrorMetric::NUMERIC;
}
Block4x4::~Block4x4()
{
m_pimageSource = nullptr;
if (m_pencoding)
{
delete m_pencoding;
m_pencoding = nullptr;
}
}
// ----------------------------------------------------------------------------------------------------
// initialization prior to encoding from a source image
// [a_uiSourceH,a_uiSourceV] is the location of the block in a_pimageSource
// a_paucEncodingBits is the place to store the final encoding
// a_errormetric is used for finding the best encoding
//
void Block4x4::InitFromSource(Image *a_pimageSource,
unsigned int a_uiSourceH, unsigned int a_uiSourceV,
unsigned char *a_paucEncodingBits,
ErrorMetric a_errormetric)
{
Block4x4();
m_pimageSource = a_pimageSource;
m_uiSourceH = a_uiSourceH;
m_uiSourceV = a_uiSourceV;
m_errormetric = a_errormetric;
SetSourcePixels();
// set block encoder function
switch (m_pimageSource->GetFormat())
{
case Image::Format::ETC1:
m_pencoding = new Block4x4Encoding_ETC1;
break;
case Image::Format::RGB8:
case Image::Format::SRGB8:
m_pencoding = new Block4x4Encoding_RGB8;
break;
case Image::Format::RGBA8:
case Image::Format::SRGBA8:
if (a_errormetric == RGBX)
{
m_pencoding = new Block4x4Encoding_RGBA8;
}
else
{
switch (m_sourcealphamix)
{
case SourceAlphaMix::OPAQUE:
m_pencoding = new Block4x4Encoding_RGBA8_Opaque;
break;
case SourceAlphaMix::TRANSPARENT:
m_pencoding = new Block4x4Encoding_RGBA8_Transparent;
break;
case SourceAlphaMix::TRANSLUCENT:
m_pencoding = new Block4x4Encoding_RGBA8;
break;
default:
assert(0);
break;
}
break;
}
break;
case Image::Format::RGB8A1:
case Image::Format::SRGB8A1:
switch (m_sourcealphamix)
{
case SourceAlphaMix::OPAQUE:
m_pencoding = new Block4x4Encoding_RGB8A1_Opaque;
break;
case SourceAlphaMix::TRANSPARENT:
m_pencoding = new Block4x4Encoding_RGB8A1_Transparent;
break;
case SourceAlphaMix::TRANSLUCENT:
if (m_boolPunchThroughPixels)
{
m_pencoding = new Block4x4Encoding_RGB8A1;
}
else
{
m_pencoding = new Block4x4Encoding_RGB8A1_Opaque;
}
break;
default:
assert(0);
break;
}
break;
case Image::Format::R11:
case Image::Format::SIGNED_R11:
m_pencoding = new Block4x4Encoding_R11;
break;
case Image::Format::RG11:
case Image::Format::SIGNED_RG11:
m_pencoding = new Block4x4Encoding_RG11;
break;
default:
assert(0);
break;
}
m_pencoding->InitFromSource(this, m_afrgbaSource,
a_paucEncodingBits, a_errormetric);
}
// ----------------------------------------------------------------------------------------------------
// initialization of encoding state from a prior encoding using encoding bits
// [a_uiSourceH,a_uiSourceV] is the location of the block in a_pimageSource
// a_paucEncodingBits is the place to read the prior encoding
// a_imageformat is used to determine how to interpret a_paucEncodingBits
// a_errormetric was used for the prior encoding
//
void Block4x4::InitFromEtcEncodingBits(Image::Format a_imageformat,
unsigned int a_uiSourceH, unsigned int a_uiSourceV,
unsigned char *a_paucEncodingBits,
Image *a_pimageSource,
ErrorMetric a_errormetric)
{
Block4x4();
m_pimageSource = a_pimageSource;
m_uiSourceH = a_uiSourceH;
m_uiSourceV = a_uiSourceV;
m_errormetric = a_errormetric;
SetSourcePixels();
// set block encoder function
switch (a_imageformat)
{
case Image::Format::ETC1:
m_pencoding = new Block4x4Encoding_ETC1;
break;
case Image::Format::RGB8:
case Image::Format::SRGB8:
m_pencoding = new Block4x4Encoding_RGB8;
break;
case Image::Format::RGBA8:
case Image::Format::SRGBA8:
m_pencoding = new Block4x4Encoding_RGBA8;
break;
case Image::Format::RGB8A1:
case Image::Format::SRGB8A1:
m_pencoding = new Block4x4Encoding_RGB8A1;
break;
case Image::Format::R11:
case Image::Format::SIGNED_R11:
m_pencoding = new Block4x4Encoding_R11;
break;
case Image::Format::RG11:
case Image::Format::SIGNED_RG11:
m_pencoding = new Block4x4Encoding_RG11;
break;
default:
assert(0);
break;
}
m_pencoding->InitFromEncodingBits(this, a_paucEncodingBits, m_afrgbaSource,
m_pimageSource->GetErrorMetric());
}
// ----------------------------------------------------------------------------------------------------
// set source pixels from m_pimageSource
// set m_alphamix
//
void Block4x4::SetSourcePixels(void)
{
Image::Format imageformat = m_pimageSource->GetFormat();
// alpha census
unsigned int uiTransparentSourcePixels = 0;
unsigned int uiOpaqueSourcePixels = 0;
// copy source to consecutive memory locations
// convert from image horizontal scan to block vertical scan
unsigned int uiPixel = 0;
for (unsigned int uiBlockPixelH = 0; uiBlockPixelH < Block4x4::COLUMNS; uiBlockPixelH++)
{
unsigned int uiSourcePixelH = m_uiSourceH + uiBlockPixelH;
for (unsigned int uiBlockPixelV = 0; uiBlockPixelV < Block4x4::ROWS; uiBlockPixelV++)
{
unsigned int uiSourcePixelV = m_uiSourceV + uiBlockPixelV;
ColorFloatRGBA *pfrgbaSource = m_pimageSource->GetSourcePixel(uiSourcePixelH, uiSourcePixelV);
// if pixel extends beyond source image because of block padding
if (pfrgbaSource == nullptr)
{
m_afrgbaSource[uiPixel] = ColorFloatRGBA(0.0f, 0.0f, 0.0f, NAN); // denotes border pixel
m_boolBorderPixels = true;
uiTransparentSourcePixels++;
}
else
{
//get teh current pixel data, and store some of the attributes
//before capping values to fit the encoder type
m_afrgbaSource[uiPixel] = (*pfrgbaSource).ClampRGBA();
if (m_afrgbaSource[uiPixel].fA == 1.0f || m_errormetric == RGBX)
{
m_pimageSource->m_iNumOpaquePixels++;
}
else if (m_afrgbaSource[uiPixel].fA == 0.0f)
{
m_pimageSource->m_iNumTransparentPixels++;
}
else if(m_afrgbaSource[uiPixel].fA > 0.0f && m_afrgbaSource[uiPixel].fA < 1.0f)
{
m_pimageSource->m_iNumTranslucentPixels++;
}
else
{
m_pimageSource->m_numOutOfRangeValues.fA++;
}
if (m_afrgbaSource[uiPixel].fR != 0.0f)
{
m_pimageSource->m_numColorValues.fR++;
//make sure we are getting a float between 0-1
if (m_afrgbaSource[uiPixel].fR - 1.0f > 0.0f)
{
m_pimageSource->m_numOutOfRangeValues.fR++;
}
}
if (m_afrgbaSource[uiPixel].fG != 0.0f)
{
m_pimageSource->m_numColorValues.fG++;
if (m_afrgbaSource[uiPixel].fG - 1.0f > 0.0f)
{
m_pimageSource->m_numOutOfRangeValues.fG++;
}
}
if (m_afrgbaSource[uiPixel].fB != 0.0f)
{
m_pimageSource->m_numColorValues.fB++;
if (m_afrgbaSource[uiPixel].fB - 1.0f > 0.0f)
{
m_pimageSource->m_numOutOfRangeValues.fB++;
}
}
// for formats with no alpha, set source alpha to 1
if (imageformat == Image::Format::ETC1 ||
imageformat == Image::Format::RGB8 ||
imageformat == Image::Format::SRGB8)
{
m_afrgbaSource[uiPixel].fA = 1.0f;
}
if (imageformat == Image::Format::R11 ||
imageformat == Image::Format::SIGNED_R11)
{
m_afrgbaSource[uiPixel].fA = 1.0f;
m_afrgbaSource[uiPixel].fG = 0.0f;
m_afrgbaSource[uiPixel].fB = 0.0f;
}
if (imageformat == Image::Format::RG11 ||
imageformat == Image::Format::SIGNED_RG11)
{
m_afrgbaSource[uiPixel].fA = 1.0f;
m_afrgbaSource[uiPixel].fB = 0.0f;
}
// for RGB8A1, set source alpha to 0.0 or 1.0
// set punch through flag
if (imageformat == Image::Format::RGB8A1 ||
imageformat == Image::Format::SRGB8A1)
{
if (m_afrgbaSource[uiPixel].fA >= 0.5f)
{
m_afrgbaSource[uiPixel].fA = 1.0f;
}
else
{
m_afrgbaSource[uiPixel].fA = 0.0f;
m_boolPunchThroughPixels = true;
}
}
if (m_afrgbaSource[uiPixel].fA == 1.0f || m_errormetric == RGBX)
{
uiOpaqueSourcePixels++;
}
else if (m_afrgbaSource[uiPixel].fA == 0.0f)
{
uiTransparentSourcePixels++;
}
}
uiPixel += 1;
}
}
if (uiOpaqueSourcePixels == PIXELS)
{
m_sourcealphamix = SourceAlphaMix::OPAQUE;
}
else if (uiTransparentSourcePixels == PIXELS)
{
m_sourcealphamix = SourceAlphaMix::TRANSPARENT;
}
else
{
m_sourcealphamix = SourceAlphaMix::TRANSLUCENT;
}
}
// ----------------------------------------------------------------------------------------------------
// return a name for the encoding mode
//
const char * Block4x4::GetEncodingModeName(void)
{
switch (m_pencoding->GetMode())
{
case Block4x4Encoding::MODE_ETC1:
return "ETC1";
case Block4x4Encoding::MODE_T:
return "T";
case Block4x4Encoding::MODE_H:
return "H";
case Block4x4Encoding::MODE_PLANAR:
return "PLANAR";
default:
return "???";
}
}
// ----------------------------------------------------------------------------------------------------
//
}

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include "EtcColor.h"
#include "EtcColorFloatRGBA.h"
#include "EtcErrorMetric.h"
#include "EtcImage.h"
#include "EtcBlock4x4Encoding.h"
namespace Etc
{
class Block4x4EncodingBits;
class Block4x4
{
public:
static const unsigned int ROWS = 4;
static const unsigned int COLUMNS = 4;
static const unsigned int PIXELS = ROWS * COLUMNS;
// the alpha mix for a 4x4 block of pixels
enum class SourceAlphaMix
{
UNKNOWN,
//
OPAQUE, // all 1.0
TRANSPARENT, // all 0.0 or NAN
TRANSLUCENT // not all opaque or transparent
};
typedef void (Block4x4::*EncoderFunctionPtr)(void);
Block4x4(void);
~Block4x4();
void InitFromSource(Image *a_pimageSource,
unsigned int a_uiSourceH,
unsigned int a_uiSourceV,
unsigned char *a_paucEncodingBits,
ErrorMetric a_errormetric);
void InitFromEtcEncodingBits(Image::Format a_imageformat,
unsigned int a_uiSourceH,
unsigned int a_uiSourceV,
unsigned char *a_paucEncodingBits,
Image *a_pimageSource,
ErrorMetric a_errormetric);
// return true if final iteration was performed
inline void PerformEncodingIteration(float a_fEffort)
{
m_pencoding->PerformIteration(a_fEffort);
}
inline void SetEncodingBitsFromEncoding(void)
{
m_pencoding->SetEncodingBits();
}
inline unsigned int GetSourceH(void)
{
return m_uiSourceH;
}
inline unsigned int GetSourceV(void)
{
return m_uiSourceV;
}
inline float GetError(void)
{
return m_pencoding->GetError();
}
static const unsigned int s_auiPixelOrderHScan[PIXELS];
inline ColorFloatRGBA * GetDecodedColors(void)
{
return m_pencoding->GetDecodedColors();
}
inline float * GetDecodedAlphas(void)
{
return m_pencoding->GetDecodedAlphas();
}
inline Block4x4Encoding::Mode GetEncodingMode(void)
{
return m_pencoding->GetMode();
}
inline bool GetFlip(void)
{
return m_pencoding->GetFlip();
}
inline bool IsDifferential(void)
{
return m_pencoding->IsDifferential();
}
inline ColorFloatRGBA * GetSource()
{
return m_afrgbaSource;
}
inline ErrorMetric GetErrorMetric()
{
return m_errormetric;
}
const char * GetEncodingModeName(void);
inline Block4x4Encoding * GetEncoding(void)
{
return m_pencoding;
}
inline SourceAlphaMix GetSourceAlphaMix(void)
{
return m_sourcealphamix;
}
inline Image * GetImageSource(void)
{
return m_pimageSource;
}
inline bool HasBorderPixels(void)
{
return m_boolBorderPixels;
}
inline bool HasPunchThroughPixels(void)
{
return m_boolPunchThroughPixels;
}
private:
void SetSourcePixels(void);
Image *m_pimageSource;
unsigned int m_uiSourceH;
unsigned int m_uiSourceV;
ErrorMetric m_errormetric;
ColorFloatRGBA m_afrgbaSource[PIXELS]; // vertical scan
SourceAlphaMix m_sourcealphamix;
bool m_boolBorderPixels; // marked as rgba(NAN, NAN, NAN, NAN)
bool m_boolPunchThroughPixels; // RGB8A1 or SRGB8A1 with any pixels with alpha < 0.5
Block4x4Encoding *m_pencoding;
};
} // namespace Etc

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
EtcBlock4x4Encoding.cpp
Block4x4Encoding is the abstract base class for the different encoders. Each encoder targets a
particular file format (e.g. ETC1, RGB8, RGBA8, R11)
*/
#include "EtcConfig.h"
#include "EtcBlock4x4Encoding.h"
#include "EtcBlock4x4EncodingBits.h"
#include "EtcBlock4x4.h"
#include <stdio.h>
#include <string.h>
#include <assert.h>
namespace Etc
{
// ----------------------------------------------------------------------------------------------------
//
const float Block4x4Encoding::LUMA_WEIGHT = 3.0f;
const float Block4x4Encoding::CHROMA_BLUE_WEIGHT = 0.5f;
// ----------------------------------------------------------------------------------------------------
//
Block4x4Encoding::Block4x4Encoding(void)
{
m_pblockParent = nullptr;
m_pafrgbaSource = nullptr;
m_boolBorderPixels = false;
m_fError = -1.0f;
m_mode = MODE_UNKNOWN;
m_uiEncodingIterations = 0;
m_boolDone = false;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
m_afrgbaDecodedColors[uiPixel] = ColorFloatRGBA(-1.0f, -1.0f, -1.0f, -1.0f);
m_afDecodedAlphas[uiPixel] = -1.0f;
}
}
// ----------------------------------------------------------------------------------------------------
// initialize the generic encoding for a 4x4 block
// a_pblockParent points to the block associated with this encoding
// a_errormetric is used to choose the best encoding
// init the decoded pixels to -1 to mark them as undefined
// init the error to -1 to mark it as undefined
//
void Block4x4Encoding::Init(Block4x4 *a_pblockParent,
ColorFloatRGBA *a_pafrgbaSource,
ErrorMetric a_errormetric)
{
m_pblockParent = a_pblockParent;
m_pafrgbaSource = a_pafrgbaSource;
m_boolBorderPixels = m_pblockParent->HasBorderPixels();
m_fError = -1.0f;
m_uiEncodingIterations = 0;
m_errormetric = a_errormetric;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
m_afrgbaDecodedColors[uiPixel] = ColorFloatRGBA(-1.0f, -1.0f, -1.0f, -1.0f);
m_afDecodedAlphas[uiPixel] = -1.0f;
}
}
// ----------------------------------------------------------------------------------------------------
// calculate the error for the block by summing the pixel errors
//
void Block4x4Encoding::CalcBlockError(void)
{
m_fError = 0.0f;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
m_fError += CalcPixelError(m_afrgbaDecodedColors[uiPixel], m_afDecodedAlphas[uiPixel],
m_pafrgbaSource[uiPixel]);
}
}
// ----------------------------------------------------------------------------------------------------
// calculate the error between the source pixel and the decoded pixel
// the error amount is base on the error metric
//
float Block4x4Encoding::CalcPixelError(ColorFloatRGBA a_frgbaDecodedColor, float a_fDecodedAlpha,
ColorFloatRGBA a_frgbaSourcePixel)
{
// if a border pixel
if (isnan(a_frgbaSourcePixel.fA))
{
return 0.0f;
}
if (m_errormetric == ErrorMetric::RGBA)
{
assert(a_fDecodedAlpha >= 0.0f);
float fDRed = (a_fDecodedAlpha * a_frgbaDecodedColor.fR) -
(a_frgbaSourcePixel.fA * a_frgbaSourcePixel.fR);
float fDGreen = (a_fDecodedAlpha * a_frgbaDecodedColor.fG) -
(a_frgbaSourcePixel.fA * a_frgbaSourcePixel.fG);
float fDBlue = (a_fDecodedAlpha * a_frgbaDecodedColor.fB) -
(a_frgbaSourcePixel.fA * a_frgbaSourcePixel.fB);
float fDAlpha = a_fDecodedAlpha - a_frgbaSourcePixel.fA;
return fDRed*fDRed + fDGreen*fDGreen + fDBlue*fDBlue + fDAlpha*fDAlpha;
}
else if (m_errormetric == ErrorMetric::RGBX)
{
assert(a_fDecodedAlpha >= 0.0f);
float fDRed = a_frgbaDecodedColor.fR - a_frgbaSourcePixel.fR;
float fDGreen = a_frgbaDecodedColor.fG - a_frgbaSourcePixel.fG;
float fDBlue = a_frgbaDecodedColor.fB - a_frgbaSourcePixel.fB;
float fDAlpha = a_fDecodedAlpha - a_frgbaSourcePixel.fA;
return fDRed*fDRed + fDGreen*fDGreen + fDBlue*fDBlue + fDAlpha*fDAlpha;
}
else if (m_errormetric == ErrorMetric::REC709)
{
assert(a_fDecodedAlpha >= 0.0f);
float fLuma1 = a_frgbaSourcePixel.fR*0.2126f + a_frgbaSourcePixel.fG*0.7152f + a_frgbaSourcePixel.fB*0.0722f;
float fChromaR1 = 0.5f * ((a_frgbaSourcePixel.fR - fLuma1) * (1.0f / (1.0f - 0.2126f)));
float fChromaB1 = 0.5f * ((a_frgbaSourcePixel.fB - fLuma1) * (1.0f / (1.0f - 0.0722f)));
float fLuma2 = a_frgbaDecodedColor.fR*0.2126f +
a_frgbaDecodedColor.fG*0.7152f +
a_frgbaDecodedColor.fB*0.0722f;
float fChromaR2 = 0.5f * ((a_frgbaDecodedColor.fR - fLuma2) * (1.0f / (1.0f - 0.2126f)));
float fChromaB2 = 0.5f * ((a_frgbaDecodedColor.fB - fLuma2) * (1.0f / (1.0f - 0.0722f)));
float fDeltaL = a_frgbaSourcePixel.fA * fLuma1 - a_fDecodedAlpha * fLuma2;
float fDeltaCr = a_frgbaSourcePixel.fA * fChromaR1 - a_fDecodedAlpha * fChromaR2;
float fDeltaCb = a_frgbaSourcePixel.fA * fChromaB1 - a_fDecodedAlpha * fChromaB2;
float fDAlpha = a_fDecodedAlpha - a_frgbaSourcePixel.fA;
// Favor Luma accuracy over Chroma, and Red over Blue
return LUMA_WEIGHT*fDeltaL*fDeltaL +
fDeltaCr*fDeltaCr +
CHROMA_BLUE_WEIGHT*fDeltaCb*fDeltaCb +
fDAlpha*fDAlpha;
#if 0
float fDRed = a_frgbaDecodedPixel.fR - a_frgbaSourcePixel.fR;
float fDGreen = a_frgbaDecodedPixel.fG - a_frgbaSourcePixel.fG;
float fDBlue = a_frgbaDecodedPixel.fB - a_frgbaSourcePixel.fB;
return 2.0f * 3.0f * fDeltaL * fDeltaL + fDRed*fDRed + fDGreen*fDGreen + fDBlue*fDBlue;
#endif
}
else if (m_errormetric == ErrorMetric::NORMALXYZ)
{
float fDecodedX = 2.0f * a_frgbaDecodedColor.fR - 1.0f;
float fDecodedY = 2.0f * a_frgbaDecodedColor.fG - 1.0f;
float fDecodedZ = 2.0f * a_frgbaDecodedColor.fB - 1.0f;
float fDecodedLength = sqrtf(fDecodedX*fDecodedX + fDecodedY*fDecodedY + fDecodedZ*fDecodedZ);
if (fDecodedLength < 0.5f)
{
return 1.0f;
}
else if (fDecodedLength == 0.0f)
{
fDecodedX = 1.0f;
fDecodedY = 0.0f;
fDecodedZ = 0.0f;
}
else
{
fDecodedX /= fDecodedLength;
fDecodedY /= fDecodedLength;
fDecodedZ /= fDecodedLength;
}
float fSourceX = 2.0f * a_frgbaSourcePixel.fR - 1.0f;
float fSourceY = 2.0f * a_frgbaSourcePixel.fG - 1.0f;
float fSourceZ = 2.0f * a_frgbaSourcePixel.fB - 1.0f;
float fSourceLength = sqrtf(fSourceX*fSourceX + fSourceY*fSourceY + fSourceZ*fSourceZ);
if (fSourceLength == 0.0f)
{
fSourceX = 1.0f;
fSourceY = 0.0f;
fSourceZ = 0.0f;
}
else
{
fSourceX /= fSourceLength;
fSourceY /= fSourceLength;
fSourceZ /= fSourceLength;
}
float fDotProduct = fSourceX*fDecodedX + fSourceY*fDecodedY + fSourceZ*fDecodedZ;
float fNormalizedDotProduct = 1.0f - 0.5f * (fDotProduct + 1.0f);
float fDotProductError = fNormalizedDotProduct * fNormalizedDotProduct;
float fLength2 = fDecodedX*fDecodedX + fDecodedY*fDecodedY + fDecodedZ*fDecodedZ;
float fLength2Error = fabsf(1.0f - fLength2);
float fDeltaW = a_frgbaDecodedColor.fA - a_frgbaSourcePixel.fA;
float fErrorW = fDeltaW * fDeltaW;
return fDotProductError + fLength2Error + fErrorW;
}
else // ErrorMetric::NUMERIC
{
assert(a_fDecodedAlpha >= 0.0f);
float fDX = a_frgbaDecodedColor.fR - a_frgbaSourcePixel.fR;
float fDY = a_frgbaDecodedColor.fG - a_frgbaSourcePixel.fG;
float fDZ = a_frgbaDecodedColor.fB - a_frgbaSourcePixel.fB;
float fDW = a_frgbaDecodedColor.fA - a_frgbaSourcePixel.fA;
return fDX*fDX + fDY*fDY + fDZ*fDZ + fDW*fDW;
}
}
// ----------------------------------------------------------------------------------------------------
//
} // namespace Etc

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include "EtcColorFloatRGBA.h"
#include "EtcErrorMetric.h"
#include <assert.h>
#include <float.h>
namespace Etc
{
class Block4x4;
// abstract base class for specific encodings
class Block4x4Encoding
{
public:
static const unsigned int ROWS = 4;
static const unsigned int COLUMNS = 4;
static const unsigned int PIXELS = ROWS * COLUMNS;
static const float LUMA_WEIGHT;
static const float CHROMA_BLUE_WEIGHT;
typedef enum
{
MODE_UNKNOWN,
//
MODE_ETC1,
MODE_T,
MODE_H,
MODE_PLANAR,
MODE_R11,
MODE_RG11,
//
MODES
} Mode;
Block4x4Encoding(void);
//virtual ~Block4x4Encoding(void) =0;
virtual ~Block4x4Encoding(void) {}
virtual void InitFromSource(Block4x4 *a_pblockParent,
ColorFloatRGBA *a_pafrgbaSource,
unsigned char *a_paucEncodingBits, ErrorMetric a_errormetric) = 0;
virtual void InitFromEncodingBits(Block4x4 *a_pblockParent,
unsigned char *a_paucEncodingBits,
ColorFloatRGBA *a_pafrgbaSource,
ErrorMetric a_errormetric) = 0;
// perform an iteration of the encoding
// the first iteration must generate a complete, valid (if poor) encoding
virtual void PerformIteration(float a_fEffort) = 0;
void CalcBlockError(void);
inline float GetError(void)
{
assert(m_fError >= 0.0f);
return m_fError;
}
inline ColorFloatRGBA * GetDecodedColors(void)
{
return m_afrgbaDecodedColors;
}
inline float * GetDecodedAlphas(void)
{
return m_afDecodedAlphas;
}
virtual void SetEncodingBits(void) = 0;
virtual bool GetFlip(void) = 0;
virtual bool IsDifferential(void) = 0;
virtual bool HasSeverelyBentDifferentialColors(void) const = 0;
inline Mode GetMode(void)
{
return m_mode;
}
inline bool IsDone(void)
{
return m_boolDone;
}
inline void SetDoneIfPerfect()
{
if (GetError() == 0.0f)
{
m_boolDone = true;
}
}
float CalcPixelError(ColorFloatRGBA a_frgbaDecodedColor, float a_fDecodedAlpha,
ColorFloatRGBA a_frgbaSourcePixel);
protected:
void Init(Block4x4 *a_pblockParent,
ColorFloatRGBA *a_pafrgbaSource,
ErrorMetric a_errormetric);
Block4x4 *m_pblockParent;
ColorFloatRGBA *m_pafrgbaSource;
bool m_boolBorderPixels; // if block has any border pixels
ColorFloatRGBA m_afrgbaDecodedColors[PIXELS]; // decoded RGB components, ignore Alpha
float m_afDecodedAlphas[PIXELS]; // decoded alpha component
float m_fError; // error for RGBA relative to m_pafrgbaSource
// intermediate encoding
Mode m_mode;
unsigned int m_uiEncodingIterations;
bool m_boolDone; // all iterations have been done
ErrorMetric m_errormetric;
private:
};
} // namespace Etc

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <assert.h>
namespace Etc
{
// ################################################################################
// Block4x4EncodingBits
// Base class for Block4x4EncodingBits_XXXX
// ################################################################################
class Block4x4EncodingBits
{
public:
enum class Format
{
UNKNOWN,
//
RGB8,
RGBA8,
R11,
RG11,
RGB8A1,
//
FORMATS
};
static unsigned int GetBytesPerBlock(Format a_format)
{
switch (a_format)
{
case Format::RGB8:
case Format::R11:
case Format::RGB8A1:
return 8;
break;
case Format::RGBA8:
case Format::RG11:
return 16;
break;
default:
return 0;
break;
}
}
};
// ################################################################################
// Block4x4EncodingBits_RGB8
// Encoding bits for the RGB portion of ETC1, RGB8, RGB8A1 and RGBA8
// ################################################################################
class Block4x4EncodingBits_RGB8
{
public:
static const unsigned int BYTES_PER_BLOCK = 8;
inline Block4x4EncodingBits_RGB8(void)
{
assert(sizeof(Block4x4EncodingBits_RGB8) == BYTES_PER_BLOCK);
for (unsigned int uiByte = 0; uiByte < BYTES_PER_BLOCK; uiByte++)
{
auc[uiByte] = 0;
}
}
typedef struct
{
unsigned red2 : 4;
unsigned red1 : 4;
//
unsigned green2 : 4;
unsigned green1 : 4;
//
unsigned blue2 : 4;
unsigned blue1 : 4;
//
unsigned flip : 1;
unsigned diff : 1;
unsigned cw2 : 3;
unsigned cw1 : 3;
//
unsigned int selectors;
} Individual;
typedef struct
{
signed dred2 : 3;
unsigned red1 : 5;
//
signed dgreen2 : 3;
unsigned green1 : 5;
//
signed dblue2 : 3;
unsigned blue1 : 5;
//
unsigned flip : 1;
unsigned diff : 1;
unsigned cw2 : 3;
unsigned cw1 : 3;
//
unsigned int selectors;
} Differential;
typedef struct
{
unsigned red1b : 2;
unsigned detect2 : 1;
unsigned red1a : 2;
unsigned detect1 : 3;
//
unsigned blue1 : 4;
unsigned green1 : 4;
//
unsigned green2 : 4;
unsigned red2 : 4;
//
unsigned db : 1;
unsigned diff : 1;
unsigned da : 2;
unsigned blue2 : 4;
//
unsigned int selectors;
} T;
typedef struct
{
unsigned green1a : 3;
unsigned red1 : 4;
unsigned detect1 : 1;
//
unsigned blue1b : 2;
unsigned detect3 : 1;
unsigned blue1a : 1;
unsigned green1b : 1;
unsigned detect2 : 3;
//
unsigned green2a : 3;
unsigned red2 : 4;
unsigned blue1c : 1;
//
unsigned db : 1;
unsigned diff : 1;
unsigned da : 1;
unsigned blue2 : 4;
unsigned green2b : 1;
//
unsigned int selectors;
} H;
typedef struct
{
unsigned originGreen1 : 1;
unsigned originRed : 6;
unsigned detect1 : 1;
//
unsigned originBlue1 : 1;
unsigned originGreen2 : 6;
unsigned detect2 : 1;
//
unsigned originBlue3 : 2;
unsigned detect4 : 1;
unsigned originBlue2 : 2;
unsigned detect3 : 3;
//
unsigned horizRed2 : 1;
unsigned diff : 1;
unsigned horizRed1 : 5;
unsigned originBlue4 : 1;
//
unsigned horizBlue1: 1;
unsigned horizGreen : 7;
//
unsigned vertRed1 : 3;
unsigned horizBlue2 : 5;
//
unsigned vertGreen1 : 5;
unsigned vertRed2 : 3;
//
unsigned vertBlue : 6;
unsigned vertGreen2 : 2;
} Planar;
union
{
unsigned char auc[BYTES_PER_BLOCK];
unsigned long int ul;
Individual individual;
Differential differential;
T t;
H h;
Planar planar;
};
};
// ################################################################################
// Block4x4EncodingBits_A8
// Encoding bits for the A portion of RGBA8
// ################################################################################
class Block4x4EncodingBits_A8
{
public:
static const unsigned int BYTES_PER_BLOCK = 8;
static const unsigned int SELECTOR_BYTES = 6;
typedef struct
{
unsigned base : 8;
unsigned table : 4;
unsigned multiplier : 4;
unsigned selectors0 : 8;
unsigned selectors1 : 8;
unsigned selectors2 : 8;
unsigned selectors3 : 8;
unsigned selectors4 : 8;
unsigned selectors5 : 8;
} Data;
Data data;
};
// ################################################################################
// Block4x4EncodingBits_R11
// Encoding bits for the R portion of R11
// ################################################################################
class Block4x4EncodingBits_R11
{
public:
static const unsigned int BYTES_PER_BLOCK = 8;
static const unsigned int SELECTOR_BYTES = 6;
typedef struct
{
unsigned base : 8;
unsigned table : 4;
unsigned multiplier : 4;
unsigned selectors0 : 8;
unsigned selectors1 : 8;
unsigned selectors2 : 8;
unsigned selectors3 : 8;
unsigned selectors4 : 8;
unsigned selectors5 : 8;
} Data;
Data data;
};
class Block4x4EncodingBits_RG11
{
public:
static const unsigned int BYTES_PER_BLOCK = 16;
static const unsigned int SELECTOR_BYTES = 12;
typedef struct
{
//Red portion
unsigned baseR : 8;
unsigned tableIndexR : 4;
unsigned multiplierR : 4;
unsigned selectorsR0 : 8;
unsigned selectorsR1 : 8;
unsigned selectorsR2 : 8;
unsigned selectorsR3 : 8;
unsigned selectorsR4 : 8;
unsigned selectorsR5 : 8;
//Green portion
unsigned baseG : 8;
unsigned tableIndexG : 4;
unsigned multiplierG : 4;
unsigned selectorsG0 : 8;
unsigned selectorsG1 : 8;
unsigned selectorsG2 : 8;
unsigned selectorsG3 : 8;
unsigned selectorsG4 : 8;
unsigned selectorsG5 : 8;
} Data;
Data data;
};
}

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include "EtcBlock4x4Encoding.h"
#include "EtcBlock4x4EncodingBits.h"
#include "EtcDifferentialTrys.h"
#include "EtcIndividualTrys.h"
namespace Etc
{
// base class for Block4x4Encoding_RGB8
class Block4x4Encoding_ETC1 : public Block4x4Encoding
{
public:
Block4x4Encoding_ETC1(void);
virtual ~Block4x4Encoding_ETC1(void);
virtual void InitFromSource(Block4x4 *a_pblockParent,
ColorFloatRGBA *a_pafrgbaSource,
unsigned char *a_paucEncodingBits,
ErrorMetric a_errormetric);
virtual void InitFromEncodingBits(Block4x4 *a_pblockParent,
unsigned char *a_paucEncodingBits,
ColorFloatRGBA *a_pafrgbaSource,
ErrorMetric a_errormetric);
virtual void PerformIteration(float a_fEffort);
inline virtual bool GetFlip(void)
{
return m_boolFlip;
}
inline virtual bool IsDifferential(void)
{
return m_boolDiff;
}
virtual void SetEncodingBits(void);
void Decode(void);
inline ColorFloatRGBA GetColor1(void) const
{
return m_frgbaColor1;
}
inline ColorFloatRGBA GetColor2(void) const
{
return m_frgbaColor2;
}
inline const unsigned int * GetSelectors(void) const
{
return m_auiSelectors;
}
inline unsigned int GetCW1(void) const
{
return m_uiCW1;
}
inline unsigned int GetCW2(void) const
{
return m_uiCW2;
}
inline bool HasSeverelyBentDifferentialColors(void) const
{
return m_boolSeverelyBentDifferentialColors;
}
protected:
static const unsigned int s_auiPixelOrderFlip0[PIXELS];
static const unsigned int s_auiPixelOrderFlip1[PIXELS];
static const unsigned int s_auiPixelOrderHScan[PIXELS];
static const unsigned int s_auiLeftPixelMapping[8];
static const unsigned int s_auiRightPixelMapping[8];
static const unsigned int s_auiTopPixelMapping[8];
static const unsigned int s_auiBottomPixelMapping[8];
static const unsigned int SELECTOR_BITS = 2;
static const unsigned int SELECTORS = 1 << SELECTOR_BITS;
static const unsigned int CW_BITS = 3;
static const unsigned int CW_RANGES = 1 << CW_BITS;
static float s_aafCwTable[CW_RANGES][SELECTORS];
static unsigned char s_aucDifferentialCwRange[256];
static const int MAX_DIFFERENTIAL = 3;
static const int MIN_DIFFERENTIAL = -4;
void InitFromEncodingBits_Selectors(void);
void PerformFirstIteration(void);
void CalculateMostLikelyFlip(void);
void TryDifferential(bool a_boolFlip, unsigned int a_uiRadius,
int a_iGrayOffset1, int a_iGrayOffset2);
void TryDifferentialHalf(DifferentialTrys::Half *a_phalf);
void TryIndividual(bool a_boolFlip, unsigned int a_uiRadius);
void TryIndividualHalf(IndividualTrys::Half *a_phalf);
void TryDegenerates1(void);
void TryDegenerates2(void);
void TryDegenerates3(void);
void TryDegenerates4(void);
void CalculateSelectors();
void CalculateHalfOfTheSelectors(unsigned int a_uiHalf,
const unsigned int *pauiPixelMapping);
// calculate the distance2 of r_frgbaPixel from r_frgbaTarget's gray line
inline float CalcGrayDistance2(ColorFloatRGBA &r_frgbaPixel,
ColorFloatRGBA &r_frgbaTarget)
{
float fDeltaGray = ((r_frgbaPixel.fR - r_frgbaTarget.fR) +
(r_frgbaPixel.fG - r_frgbaTarget.fG) +
(r_frgbaPixel.fB - r_frgbaTarget.fB)) / 3.0f;
ColorFloatRGBA frgbaPointOnGrayLine = (r_frgbaTarget + fDeltaGray).ClampRGB();
float fDR = r_frgbaPixel.fR - frgbaPointOnGrayLine.fR;
float fDG = r_frgbaPixel.fG - frgbaPointOnGrayLine.fG;
float fDB = r_frgbaPixel.fB - frgbaPointOnGrayLine.fB;
return (fDR*fDR) + (fDG*fDG) + (fDB*fDB);
}
void SetEncodingBits_Selectors(void);
// intermediate encoding
bool m_boolDiff;
bool m_boolFlip;
ColorFloatRGBA m_frgbaColor1;
ColorFloatRGBA m_frgbaColor2;
unsigned int m_uiCW1;
unsigned int m_uiCW2;
unsigned int m_auiSelectors[PIXELS];
// state shared between iterations
ColorFloatRGBA m_frgbaSourceAverageLeft;
ColorFloatRGBA m_frgbaSourceAverageRight;
ColorFloatRGBA m_frgbaSourceAverageTop;
ColorFloatRGBA m_frgbaSourceAverageBottom;
bool m_boolMostLikelyFlip;
// stats
float m_fError1; // error for Etc1 half 1
float m_fError2; // error for Etc1 half 2
bool m_boolSeverelyBentDifferentialColors; // only valid if m_boolDiff;
// final encoding
Block4x4EncodingBits_RGB8 *m_pencodingbitsRGB8; // or RGB8 portion of Block4x4EncodingBits_RGB8A8
private:
void CalculateSourceAverages(void);
};
} // namespace Etc

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
EtcBlock4x4Encoding_R11.cpp
Block4x4Encoding_R11 is the encoder to use when targetting file format R11 and SR11 (signed R11).
*/
#include "EtcConfig.h"
#include "EtcBlock4x4Encoding_R11.h"
#include "EtcBlock4x4EncodingBits.h"
#include "EtcBlock4x4.h"
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <float.h>
#include <limits>
namespace Etc
{
// modifier values to use for R11, SR11, RG11 and SRG11
float Block4x4Encoding_R11::s_aafModifierTable[MODIFIER_TABLE_ENTRYS][SELECTORS]
{
{ -3.0f / 255.0f, -6.0f / 255.0f, -9.0f / 255.0f, -15.0f / 255.0f, 2.0f / 255.0f, 5.0f / 255.0f, 8.0f / 255.0f, 14.0f / 255.0f },
{ -3.0f / 255.0f, -7.0f / 255.0f, -10.0f / 255.0f, -13.0f / 255.0f, 2.0f / 255.0f, 6.0f / 255.0f, 9.0f / 255.0f, 12.0f / 255.0f },
{ -2.0f / 255.0f, -5.0f / 255.0f, -8.0f / 255.0f, -13.0f / 255.0f, 1.0f / 255.0f, 4.0f / 255.0f, 7.0f / 255.0f, 12.0f / 255.0f },
{ -2.0f / 255.0f, -4.0f / 255.0f, -6.0f / 255.0f, -13.0f / 255.0f, 1.0f / 255.0f, 3.0f / 255.0f, 5.0f / 255.0f, 12.0f / 255.0f },
{ -3.0f / 255.0f, -6.0f / 255.0f, -8.0f / 255.0f, -12.0f / 255.0f, 2.0f / 255.0f, 5.0f / 255.0f, 7.0f / 255.0f, 11.0f / 255.0f },
{ -3.0f / 255.0f, -7.0f / 255.0f, -9.0f / 255.0f, -11.0f / 255.0f, 2.0f / 255.0f, 6.0f / 255.0f, 8.0f / 255.0f, 10.0f / 255.0f },
{ -4.0f / 255.0f, -7.0f / 255.0f, -8.0f / 255.0f, -11.0f / 255.0f, 3.0f / 255.0f, 6.0f / 255.0f, 7.0f / 255.0f, 10.0f / 255.0f },
{ -3.0f / 255.0f, -5.0f / 255.0f, -8.0f / 255.0f, -11.0f / 255.0f, 2.0f / 255.0f, 4.0f / 255.0f, 7.0f / 255.0f, 10.0f / 255.0f },
{ -2.0f / 255.0f, -6.0f / 255.0f, -8.0f / 255.0f, -10.0f / 255.0f, 1.0f / 255.0f, 5.0f / 255.0f, 7.0f / 255.0f, 9.0f / 255.0f },
{ -2.0f / 255.0f, -5.0f / 255.0f, -8.0f / 255.0f, -10.0f / 255.0f, 1.0f / 255.0f, 4.0f / 255.0f, 7.0f / 255.0f, 9.0f / 255.0f },
{ -2.0f / 255.0f, -4.0f / 255.0f, -8.0f / 255.0f, -10.0f / 255.0f, 1.0f / 255.0f, 3.0f / 255.0f, 7.0f / 255.0f, 9.0f / 255.0f },
{ -2.0f / 255.0f, -5.0f / 255.0f, -7.0f / 255.0f, -10.0f / 255.0f, 1.0f / 255.0f, 4.0f / 255.0f, 6.0f / 255.0f, 9.0f / 255.0f },
{ -3.0f / 255.0f, -4.0f / 255.0f, -7.0f / 255.0f, -10.0f / 255.0f, 2.0f / 255.0f, 3.0f / 255.0f, 6.0f / 255.0f, 9.0f / 255.0f },
{ -1.0f / 255.0f, -2.0f / 255.0f, -3.0f / 255.0f, -10.0f / 255.0f, 0.0f / 255.0f, 1.0f / 255.0f, 2.0f / 255.0f, 9.0f / 255.0f },
{ -4.0f / 255.0f, -6.0f / 255.0f, -8.0f / 255.0f, -9.0f / 255.0f, 3.0f / 255.0f, 5.0f / 255.0f, 7.0f / 255.0f, 8.0f / 255.0f },
{ -3.0f / 255.0f, -5.0f / 255.0f, -7.0f / 255.0f, -9.0f / 255.0f, 2.0f / 255.0f, 4.0f / 255.0f, 6.0f / 255.0f, 8.0f / 255.0f }
};
// ----------------------------------------------------------------------------------------------------
//
Block4x4Encoding_R11::Block4x4Encoding_R11(void)
{
m_pencodingbitsR11 = nullptr;
}
Block4x4Encoding_R11::~Block4x4Encoding_R11(void) {}
// ----------------------------------------------------------------------------------------------------
// initialization prior to encoding
// a_pblockParent points to the block associated with this encoding
// a_errormetric is used to choose the best encoding
// a_pafrgbaSource points to a 4x4 block subset of the source image
// a_paucEncodingBits points to the final encoding bits
//
void Block4x4Encoding_R11::InitFromSource(Block4x4 *a_pblockParent,
ColorFloatRGBA *a_pafrgbaSource,
unsigned char *a_paucEncodingBits, ErrorMetric a_errormetric)
{
Block4x4Encoding::Init(a_pblockParent, a_pafrgbaSource,a_errormetric);
m_pencodingbitsR11 = (Block4x4EncodingBits_R11 *)a_paucEncodingBits;
}
// ----------------------------------------------------------------------------------------------------
// initialization from the encoding bits of a previous encoding
// a_pblockParent points to the block associated with this encoding
// a_errormetric is used to choose the best encoding
// a_pafrgbaSource points to a 4x4 block subset of the source image
// a_paucEncodingBits points to the final encoding bits of a previous encoding
//
void Block4x4Encoding_R11::InitFromEncodingBits(Block4x4 *a_pblockParent,
unsigned char *a_paucEncodingBits,
ColorFloatRGBA *a_pafrgbaSource,
ErrorMetric a_errormetric)
{
m_pencodingbitsR11 = (Block4x4EncodingBits_R11 *)a_paucEncodingBits;
// init RGB portion
Block4x4Encoding_RGB8::InitFromEncodingBits(a_pblockParent,
(unsigned char *)m_pencodingbitsR11,
a_pafrgbaSource,
a_errormetric);
// init R11 portion
{
m_mode = MODE_R11;
if (a_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_R11 || a_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
{
m_fRedBase = (float)(signed char)m_pencodingbitsR11->data.base;
}
else
{
m_fRedBase = (float)(unsigned char)m_pencodingbitsR11->data.base;
}
m_fRedMultiplier = (float)m_pencodingbitsR11->data.multiplier;
m_uiRedModifierTableIndex = m_pencodingbitsR11->data.table;
unsigned long long int ulliSelectorBits = 0;
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsR11->data.selectors0 << 40;
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsR11->data.selectors1 << 32;
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsR11->data.selectors2 << 24;
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsR11->data.selectors3 << 16;
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsR11->data.selectors4 << 8;
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsR11->data.selectors5;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
unsigned int uiShift = 45 - (3 * uiPixel);
m_auiRedSelectors[uiPixel] = (ulliSelectorBits >> uiShift) & (SELECTORS - 1);
}
// decode the red channel
// calc red error
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
float fDecodedPixelData = 0.0f;
if (a_pblockParent->GetImageSource()->GetFormat() == Image::Format::R11 || a_pblockParent->GetImageSource()->GetFormat() == Image::Format::RG11)
{
fDecodedPixelData = DecodePixelRed(m_fRedBase, m_fRedMultiplier,
m_uiRedModifierTableIndex,
m_auiRedSelectors[uiPixel]);
}
else if (a_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_R11 || a_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
{
fDecodedPixelData = DecodePixelRed(m_fRedBase + 128, m_fRedMultiplier,
m_uiRedModifierTableIndex,
m_auiRedSelectors[uiPixel]);
}
else
{
assert(0);
}
m_afrgbaDecodedColors[uiPixel] = ColorFloatRGBA(fDecodedPixelData, 0.0f, 0.0f, 1.0f);
}
CalcBlockError();
}
}
// ----------------------------------------------------------------------------------------------------
// perform a single encoding iteration
// replace the encoding if a better encoding was found
// subsequent iterations generally take longer for each iteration
// set m_boolDone if encoding is perfect or encoding is finished based on a_fEffort
//
void Block4x4Encoding_R11::PerformIteration(float a_fEffort)
{
assert(!m_boolDone);
m_mode = MODE_R11;
switch (m_uiEncodingIterations)
{
case 0:
m_fError = FLT_MAX;
m_fRedBlockError = FLT_MAX; // artificially high value
CalculateR11(8, 0.0f, 0.0f);
m_fError = m_fRedBlockError;
break;
case 1:
CalculateR11(8, 2.0f, 1.0f);
m_fError = m_fRedBlockError;
if (a_fEffort <= 24.5f)
{
m_boolDone = true;
}
break;
case 2:
CalculateR11(8, 12.0f, 1.0f);
m_fError = m_fRedBlockError;
if (a_fEffort <= 49.5f)
{
m_boolDone = true;
}
break;
case 3:
CalculateR11(7, 6.0f, 1.0f);
m_fError = m_fRedBlockError;
break;
case 4:
CalculateR11(6, 3.0f, 1.0f);
m_fError = m_fRedBlockError;
break;
case 5:
CalculateR11(5, 1.0f, 0.0f);
m_fError = m_fRedBlockError;
m_boolDone = true;
break;
default:
assert(0);
break;
}
m_uiEncodingIterations++;
SetDoneIfPerfect();
}
// ----------------------------------------------------------------------------------------------------
// find the best combination of base color, multiplier and selectors
//
// a_uiSelectorsUsed limits the number of selector combinations to try
// a_fBaseRadius limits the range of base colors to try
// a_fMultiplierRadius limits the range of multipliers to try
//
void Block4x4Encoding_R11::CalculateR11(unsigned int a_uiSelectorsUsed,
float a_fBaseRadius, float a_fMultiplierRadius)
{
// maps from virtual (monotonic) selector to ETC selector
static const unsigned int auiVirtualSelectorMap[8] = {3, 2, 1, 0, 4, 5, 6, 7};
// find min/max red
float fMinRed = 1.0f;
float fMaxRed = 0.0f;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
// ignore border pixels
float fAlpha = m_pafrgbaSource[uiPixel].fA;
if (isnan(fAlpha))
{
continue;
}
float fRed = m_pafrgbaSource[uiPixel].fR;
if (fRed < fMinRed)
{
fMinRed = fRed;
}
if (fRed > fMaxRed)
{
fMaxRed = fRed;
}
}
assert(fMinRed <= fMaxRed);
float fRedRange = (fMaxRed - fMinRed);
// try each modifier table entry
for (unsigned int uiTableEntry = 0; uiTableEntry < MODIFIER_TABLE_ENTRYS; uiTableEntry++)
{
for (unsigned int uiMinVirtualSelector = 0;
uiMinVirtualSelector <= (8- a_uiSelectorsUsed);
uiMinVirtualSelector++)
{
unsigned int uiMaxVirtualSelector = uiMinVirtualSelector + a_uiSelectorsUsed - 1;
unsigned int uiMinSelector = auiVirtualSelectorMap[uiMinVirtualSelector];
unsigned int uiMaxSelector = auiVirtualSelectorMap[uiMaxVirtualSelector];
float fTableEntryCenter = -s_aafModifierTable[uiTableEntry][uiMinSelector];
float fTableEntryRange = s_aafModifierTable[uiTableEntry][uiMaxSelector] -
s_aafModifierTable[uiTableEntry][uiMinSelector];
float fCenterRatio = fTableEntryCenter / fTableEntryRange;
float fCenter = fMinRed + fCenterRatio*fRedRange;
fCenter = roundf(255.0f * fCenter) / 255.0f;
float fMinBase = fCenter - (a_fBaseRadius / 255.0f);
if (fMinBase < 0.0f)
{
fMinBase = 0.0f;
}
float fMaxBase = fCenter + (a_fBaseRadius / 255.0f);
if (fMaxBase > 1.0f)
{
fMaxBase = 1.0f;
}
for (float fBase = fMinBase; fBase <= fMaxBase; fBase += (0.999999f / 255.0f))
{
float fRangeMultiplier = roundf(fRedRange / fTableEntryRange);
float fMinMultiplier = fRangeMultiplier - a_fMultiplierRadius;
if (fMinMultiplier < 1.0f)
{
fMinMultiplier = 0.0f;
}
else if (fMinMultiplier > 15.0f)
{
fMinMultiplier = 15.0f;
}
float fMaxMultiplier = fRangeMultiplier + a_fMultiplierRadius;
if (fMaxMultiplier < 1.0f)
{
fMaxMultiplier = 1.0f;
}
else if (fMaxMultiplier > 15.0f)
{
fMaxMultiplier = 15.0f;
}
for (float fMultiplier = fMinMultiplier; fMultiplier <= fMaxMultiplier; fMultiplier += 1.0f)
{
// find best selector for each pixel
unsigned int auiBestSelectors[PIXELS];
float afBestRedError[PIXELS];
float afBestPixelRed[PIXELS];
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
float fBestPixelRedError = FLT_MAX;
for (unsigned int uiSelector = 0; uiSelector < SELECTORS; uiSelector++)
{
float fPixelRed = DecodePixelRed(fBase * 255.0f, fMultiplier, uiTableEntry, uiSelector);
ColorFloatRGBA frgba(fPixelRed, m_pafrgbaSource[uiPixel].fG,0.0f,1.0f);
float fPixelRedError = CalcPixelError(frgba, 1.0f, m_pafrgbaSource[uiPixel]);
if (fPixelRedError < fBestPixelRedError)
{
fBestPixelRedError = fPixelRedError;
auiBestSelectors[uiPixel] = uiSelector;
afBestRedError[uiPixel] = fBestPixelRedError;
afBestPixelRed[uiPixel] = fPixelRed;
}
}
}
float fBlockError = 0.0f;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
fBlockError += afBestRedError[uiPixel];
}
if (fBlockError < m_fRedBlockError)
{
m_fRedBlockError = fBlockError;
if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::R11 || m_pblockParent->GetImageSource()->GetFormat() == Image::Format::RG11)
{
m_fRedBase = 255.0f * fBase;
}
else if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_R11 || m_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
{
m_fRedBase = (fBase * 255) - 128;
}
else
{
assert(0);
}
m_fRedMultiplier = fMultiplier;
m_uiRedModifierTableIndex = uiTableEntry;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
m_auiRedSelectors[uiPixel] = auiBestSelectors[uiPixel];
float fBestPixelRed = afBestPixelRed[uiPixel];
m_afrgbaDecodedColors[uiPixel] = ColorFloatRGBA(fBestPixelRed, 0.0f, 0.0f, 1.0f);
m_afDecodedAlphas[uiPixel] = 1.0f;
}
}
}
}
}
}
}
// ----------------------------------------------------------------------------------------------------
// set the encoding bits based on encoding state
//
void Block4x4Encoding_R11::SetEncodingBits(void)
{
if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::R11 || m_pblockParent->GetImageSource()->GetFormat() == Image::Format::RG11)
{
m_pencodingbitsR11->data.base = (unsigned char)roundf(m_fRedBase);
}
else if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_R11 || m_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
{
m_pencodingbitsR11->data.base = (signed char)roundf(m_fRedBase);
}
else
{
assert(0);
}
m_pencodingbitsR11->data.table = m_uiRedModifierTableIndex;
m_pencodingbitsR11->data.multiplier = (unsigned char)roundf(m_fRedMultiplier);
unsigned long long int ulliSelectorBits = 0;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
unsigned int uiShift = 45 - (3 * uiPixel);
ulliSelectorBits |= ((unsigned long long int)m_auiRedSelectors[uiPixel]) << uiShift;
}
m_pencodingbitsR11->data.selectors0 = ulliSelectorBits >> 40;
m_pencodingbitsR11->data.selectors1 = ulliSelectorBits >> 32;
m_pencodingbitsR11->data.selectors2 = ulliSelectorBits >> 24;
m_pencodingbitsR11->data.selectors3 = ulliSelectorBits >> 16;
m_pencodingbitsR11->data.selectors4 = ulliSelectorBits >> 8;
m_pencodingbitsR11->data.selectors5 = ulliSelectorBits;
}
// ----------------------------------------------------------------------------------------------------
//
}

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include "EtcBlock4x4Encoding_RGB8.h"
namespace Etc
{
class Block4x4EncodingBits_R11;
// ################################################################################
// Block4x4Encoding_R11
// ################################################################################
class Block4x4Encoding_R11 : public Block4x4Encoding_RGB8
{
public:
Block4x4Encoding_R11(void);
virtual ~Block4x4Encoding_R11(void);
virtual void InitFromSource(Block4x4 *a_pblockParent,
ColorFloatRGBA *a_pafrgbaSource,
unsigned char *a_paucEncodingBits, ErrorMetric a_errormetric);
virtual void InitFromEncodingBits(Block4x4 *a_pblockParent,
unsigned char *a_paucEncodingBits,
ColorFloatRGBA *a_pafrgbaSource,
ErrorMetric a_errormetric);
virtual void PerformIteration(float a_fEffort);
virtual void SetEncodingBits(void);
inline float GetRedBase(void) const
{
return m_fRedBase;
}
inline float GetRedMultiplier(void) const
{
return m_fRedMultiplier;
}
inline int GetRedTableIndex(void) const
{
return m_uiRedModifierTableIndex;
}
inline const unsigned int * GetRedSelectors(void) const
{
return m_auiRedSelectors;
}
protected:
static const unsigned int MODIFIER_TABLE_ENTRYS = 16;
static const unsigned int SELECTOR_BITS = 3;
static const unsigned int SELECTORS = 1 << SELECTOR_BITS;
static float s_aafModifierTable[MODIFIER_TABLE_ENTRYS][SELECTORS];
void CalculateR11(unsigned int a_uiSelectorsUsed,
float a_fBaseRadius, float a_fMultiplierRadius);
inline float DecodePixelRed(float a_fBase, float a_fMultiplier,
unsigned int a_uiTableIndex, unsigned int a_uiSelector)
{
float fMultiplier = a_fMultiplier;
if (fMultiplier <= 0.0f)
{
fMultiplier = 1.0f / 8.0f;
}
float fPixelRed = a_fBase * 8 + 4 +
8 * fMultiplier*s_aafModifierTable[a_uiTableIndex][a_uiSelector]*255;
fPixelRed /= 2047.0f;
if (fPixelRed < 0.0f)
{
fPixelRed = 0.0f;
}
else if (fPixelRed > 1.0f)
{
fPixelRed = 1.0f;
}
return fPixelRed;
}
Block4x4EncodingBits_R11 *m_pencodingbitsR11;
float m_fRedBase;
float m_fRedMultiplier;
float m_fRedBlockError;
unsigned int m_uiRedModifierTableIndex;
unsigned int m_auiRedSelectors[PIXELS];
};
// ----------------------------------------------------------------------------------------------------
//
} // namespace Etc

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
EtcBlock4x4Encoding_RG11.cpp
Block4x4Encoding_RG11 is the encoder to use when targetting file format RG11 and SRG11 (signed RG11).
*/
#include "EtcConfig.h"
#include "EtcBlock4x4Encoding_RG11.h"
#include "EtcBlock4x4EncodingBits.h"
#include "EtcBlock4x4.h"
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <float.h>
#include <limits>
namespace Etc
{
// ----------------------------------------------------------------------------------------------------
//
Block4x4Encoding_RG11::Block4x4Encoding_RG11(void)
{
m_pencodingbitsRG11 = nullptr;
}
Block4x4Encoding_RG11::~Block4x4Encoding_RG11(void) {}
// ----------------------------------------------------------------------------------------------------
// initialization prior to encoding
// a_pblockParent points to the block associated with this encoding
// a_errormetric is used to choose the best encoding
// a_pafrgbaSource points to a 4x4 block subset of the source image
// a_paucEncodingBits points to the final encoding bits
//
void Block4x4Encoding_RG11::InitFromSource(Block4x4 *a_pblockParent,
ColorFloatRGBA *a_pafrgbaSource,
unsigned char *a_paucEncodingBits, ErrorMetric a_errormetric)
{
Block4x4Encoding::Init(a_pblockParent, a_pafrgbaSource,a_errormetric);
m_pencodingbitsRG11 = (Block4x4EncodingBits_RG11 *)a_paucEncodingBits;
}
// ----------------------------------------------------------------------------------------------------
// initialization from the encoding bits of a previous encoding
// a_pblockParent points to the block associated with this encoding
// a_errormetric is used to choose the best encoding
// a_pafrgbaSource points to a 4x4 block subset of the source image
// a_paucEncodingBits points to the final encoding bits of a previous encoding
//
void Block4x4Encoding_RG11::InitFromEncodingBits(Block4x4 *a_pblockParent,
unsigned char *a_paucEncodingBits,
ColorFloatRGBA *a_pafrgbaSource,
ErrorMetric a_errormetric)
{
m_pencodingbitsRG11 = (Block4x4EncodingBits_RG11 *)a_paucEncodingBits;
// init RGB portion
Block4x4Encoding_RGB8::InitFromEncodingBits(a_pblockParent,
(unsigned char *)m_pencodingbitsRG11,
a_pafrgbaSource,
a_errormetric);
m_fError = 0.0f;
{
m_mode = MODE_RG11;
if (a_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
{
m_fRedBase = (float)(signed char)m_pencodingbitsRG11->data.baseR;
m_fGrnBase = (float)(signed char)m_pencodingbitsRG11->data.baseG;
}
else
{
m_fRedBase = (float)(unsigned char)m_pencodingbitsRG11->data.baseR;
m_fGrnBase = (float)(unsigned char)m_pencodingbitsRG11->data.baseG;
}
m_fRedMultiplier = (float)m_pencodingbitsRG11->data.multiplierR;
m_fGrnMultiplier = (float)m_pencodingbitsRG11->data.multiplierG;
m_uiRedModifierTableIndex = m_pencodingbitsRG11->data.tableIndexR;
m_uiGrnModifierTableIndex = m_pencodingbitsRG11->data.tableIndexG;
unsigned long long int ulliSelectorBitsR = 0;
ulliSelectorBitsR |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsR0 << 40;
ulliSelectorBitsR |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsR1 << 32;
ulliSelectorBitsR |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsR2 << 24;
ulliSelectorBitsR |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsR3 << 16;
ulliSelectorBitsR |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsR4 << 8;
ulliSelectorBitsR |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsR5;
unsigned long long int ulliSelectorBitsG = 0;
ulliSelectorBitsG |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsG0 << 40;
ulliSelectorBitsG |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsG1 << 32;
ulliSelectorBitsG |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsG2 << 24;
ulliSelectorBitsG |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsG3 << 16;
ulliSelectorBitsG |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsG4 << 8;
ulliSelectorBitsG |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsG5;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
unsigned int uiShift = 45 - (3 * uiPixel);
m_auiRedSelectors[uiPixel] = (ulliSelectorBitsR >> uiShift) & (SELECTORS - 1);
m_auiGrnSelectors[uiPixel] = (ulliSelectorBitsG >> uiShift) & (SELECTORS - 1);
}
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
float fRedDecodedData = 0.0f;
float fGrnDecodedData = 0.0f;
if (a_pblockParent->GetImageSource()->GetFormat() == Image::Format::RG11)
{
fRedDecodedData = DecodePixelRed(m_fRedBase, m_fRedMultiplier, m_uiRedModifierTableIndex, m_auiRedSelectors[uiPixel]);
fGrnDecodedData = DecodePixelRed(m_fGrnBase, m_fGrnMultiplier, m_uiGrnModifierTableIndex, m_auiGrnSelectors[uiPixel]);
}
else if (a_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
{
fRedDecodedData = DecodePixelRed(m_fRedBase + 128, m_fRedMultiplier, m_uiRedModifierTableIndex, m_auiRedSelectors[uiPixel]);
fGrnDecodedData = DecodePixelRed(m_fGrnBase + 128, m_fGrnMultiplier, m_uiGrnModifierTableIndex, m_auiGrnSelectors[uiPixel]);
}
else
{
assert(0);
}
m_afrgbaDecodedColors[uiPixel] = ColorFloatRGBA(fRedDecodedData, fGrnDecodedData, 0.0f, 1.0f);
}
}
CalcBlockError();
}
// ----------------------------------------------------------------------------------------------------
// perform a single encoding iteration
// replace the encoding if a better encoding was found
// subsequent iterations generally take longer for each iteration
// set m_boolDone if encoding is perfect or encoding is finished based on a_fEffort
//
void Block4x4Encoding_RG11::PerformIteration(float a_fEffort)
{
assert(!m_boolDone);
switch (m_uiEncodingIterations)
{
case 0:
m_fError = FLT_MAX;
m_fGrnBlockError = FLT_MAX; // artificially high value
m_fRedBlockError = FLT_MAX;
CalculateR11(8, 0.0f, 0.0f);
CalculateG11(8, 0.0f, 0.0f);
m_fError = (m_fGrnBlockError + m_fRedBlockError);
break;
case 1:
CalculateR11(8, 2.0f, 1.0f);
CalculateG11(8, 2.0f, 1.0f);
m_fError = (m_fGrnBlockError + m_fRedBlockError);
if (a_fEffort <= 24.5f)
{
m_boolDone = true;
}
break;
case 2:
CalculateR11(8, 12.0f, 1.0f);
CalculateG11(8, 12.0f, 1.0f);
m_fError = (m_fGrnBlockError + m_fRedBlockError);
if (a_fEffort <= 49.5f)
{
m_boolDone = true;
}
break;
case 3:
CalculateR11(7, 6.0f, 1.0f);
CalculateG11(7, 6.0f, 1.0f);
m_fError = (m_fGrnBlockError + m_fRedBlockError);
break;
case 4:
CalculateR11(6, 3.0f, 1.0f);
CalculateG11(6, 3.0f, 1.0f);
m_fError = (m_fGrnBlockError + m_fRedBlockError);
break;
case 5:
CalculateR11(5, 1.0f, 0.0f);
CalculateG11(5, 1.0f, 0.0f);
m_fError = (m_fGrnBlockError + m_fRedBlockError);
m_boolDone = true;
break;
default:
assert(0);
break;
}
m_uiEncodingIterations++;
SetDoneIfPerfect();
}
// ----------------------------------------------------------------------------------------------------
// find the best combination of base color, multiplier and selectors
//
// a_uiSelectorsUsed limits the number of selector combinations to try
// a_fBaseRadius limits the range of base colors to try
// a_fMultiplierRadius limits the range of multipliers to try
//
void Block4x4Encoding_RG11::CalculateG11(unsigned int a_uiSelectorsUsed,
float a_fBaseRadius, float a_fMultiplierRadius)
{
// maps from virtual (monotonic) selector to etc selector
static const unsigned int auiVirtualSelectorMap[8] = { 3, 2, 1, 0, 4, 5, 6, 7 };
// find min/max Grn
float fMinGrn = 1.0f;
float fMaxGrn = 0.0f;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
// ignore border pixels
float fAlpha = m_pafrgbaSource[uiPixel].fA;
if (isnan(fAlpha))
{
continue;
}
float fGrn = m_pafrgbaSource[uiPixel].fG;
if (fGrn < fMinGrn)
{
fMinGrn = fGrn;
}
if (fGrn > fMaxGrn)
{
fMaxGrn = fGrn;
}
}
assert(fMinGrn <= fMaxGrn);
float fGrnRange = (fMaxGrn - fMinGrn);
// try each modifier table entry
for (unsigned int uiTableEntry = 0; uiTableEntry < MODIFIER_TABLE_ENTRYS; uiTableEntry++)
{
for (unsigned int uiMinVirtualSelector = 0;
uiMinVirtualSelector <= (8 - a_uiSelectorsUsed);
uiMinVirtualSelector++)
{
unsigned int uiMaxVirtualSelector = uiMinVirtualSelector + a_uiSelectorsUsed - 1;
unsigned int uiMinSelector = auiVirtualSelectorMap[uiMinVirtualSelector];
unsigned int uiMaxSelector = auiVirtualSelectorMap[uiMaxVirtualSelector];
float fTableEntryCenter = -s_aafModifierTable[uiTableEntry][uiMinSelector];
float fTableEntryRange = s_aafModifierTable[uiTableEntry][uiMaxSelector] -
s_aafModifierTable[uiTableEntry][uiMinSelector];
float fCenterRatio = fTableEntryCenter / fTableEntryRange;
float fCenter = fMinGrn + fCenterRatio*fGrnRange;
fCenter = roundf(255.0f * fCenter) / 255.0f;
float fMinBase = fCenter - (a_fBaseRadius / 255.0f);
if (fMinBase < 0.0f)
{
fMinBase = 0.0f;
}
float fMaxBase = fCenter + (a_fBaseRadius / 255.0f);
if (fMaxBase > 1.0f)
{
fMaxBase = 1.0f;
}
for (float fBase = fMinBase; fBase <= fMaxBase; fBase += (0.999999f / 255.0f))
{
float fRangeMultiplier = roundf(fGrnRange / fTableEntryRange);
float fMinMultiplier = fRangeMultiplier - a_fMultiplierRadius;
if (fMinMultiplier < 1.0f)
{
fMinMultiplier = 0.0f;
}
else if (fMinMultiplier > 15.0f)
{
fMinMultiplier = 15.0f;
}
float fMaxMultiplier = fRangeMultiplier + a_fMultiplierRadius;
if (fMaxMultiplier < 1.0f)
{
fMaxMultiplier = 1.0f;
}
else if (fMaxMultiplier > 15.0f)
{
fMaxMultiplier = 15.0f;
}
for (float fMultiplier = fMinMultiplier; fMultiplier <= fMaxMultiplier; fMultiplier += 1.0f)
{
// find best selector for each pixel
unsigned int auiBestSelectors[PIXELS];
float afBestGrnError[PIXELS];
float afBestPixelGrn[PIXELS];
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
float fBestPixelGrnError = FLT_MAX;
for (unsigned int uiSelector = 0; uiSelector < SELECTORS; uiSelector++)
{
//DecodePixelRed is not red channel specific
float fPixelGrn = DecodePixelRed(fBase * 255.0f, fMultiplier, uiTableEntry, uiSelector);
ColorFloatRGBA frgba(m_pafrgbaSource[uiPixel].fR, fPixelGrn, 0.0f, 1.0f);
float fPixelGrnError = CalcPixelError(frgba, 1.0f, m_pafrgbaSource[uiPixel]);
if (fPixelGrnError < fBestPixelGrnError)
{
fBestPixelGrnError = fPixelGrnError;
auiBestSelectors[uiPixel] = uiSelector;
afBestGrnError[uiPixel] = fBestPixelGrnError;
afBestPixelGrn[uiPixel] = fPixelGrn;
}
}
}
float fBlockError = 0.0f;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
fBlockError += afBestGrnError[uiPixel];
}
if (fBlockError < m_fGrnBlockError)
{
m_fGrnBlockError = fBlockError;
if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::RG11)
{
m_fGrnBase = 255.0f * fBase;
}
else if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
{
m_fGrnBase = (fBase * 255) - 128;
}
else
{
assert(0);
}
m_fGrnMultiplier = fMultiplier;
m_uiGrnModifierTableIndex = uiTableEntry;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
m_auiGrnSelectors[uiPixel] = auiBestSelectors[uiPixel];
m_afrgbaDecodedColors[uiPixel].fG = afBestPixelGrn[uiPixel];
m_afDecodedAlphas[uiPixel] = 1.0f;
}
}
}
}
}
}
}
// ----------------------------------------------------------------------------------------------------
// set the encoding bits based on encoding state
//
void Block4x4Encoding_RG11::SetEncodingBits(void)
{
unsigned long long int ulliSelectorBitsR = 0;
unsigned long long int ulliSelectorBitsG = 0;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
unsigned int uiShift = 45 - (3 * uiPixel);
ulliSelectorBitsR |= ((unsigned long long int)m_auiRedSelectors[uiPixel]) << uiShift;
ulliSelectorBitsG |= ((unsigned long long int)m_auiGrnSelectors[uiPixel]) << uiShift;
}
if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::RG11)
{
m_pencodingbitsRG11->data.baseR = (unsigned char)roundf(m_fRedBase);
}
else if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
{
m_pencodingbitsRG11->data.baseR = (signed char)roundf(m_fRedBase);
}
else
{
assert(0);
}
m_pencodingbitsRG11->data.tableIndexR = m_uiRedModifierTableIndex;
m_pencodingbitsRG11->data.multiplierR = (unsigned char)roundf(m_fRedMultiplier);
m_pencodingbitsRG11->data.selectorsR0 = ulliSelectorBitsR >> 40;
m_pencodingbitsRG11->data.selectorsR1 = ulliSelectorBitsR >> 32;
m_pencodingbitsRG11->data.selectorsR2 = ulliSelectorBitsR >> 24;
m_pencodingbitsRG11->data.selectorsR3 = ulliSelectorBitsR >> 16;
m_pencodingbitsRG11->data.selectorsR4 = ulliSelectorBitsR >> 8;
m_pencodingbitsRG11->data.selectorsR5 = ulliSelectorBitsR;
if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::RG11)
{
m_pencodingbitsRG11->data.baseG = (unsigned char)roundf(m_fGrnBase);
}
else if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
{
m_pencodingbitsRG11->data.baseG = (signed char)roundf(m_fGrnBase);
}
else
{
assert(0);
}
m_pencodingbitsRG11->data.tableIndexG = m_uiGrnModifierTableIndex;
m_pencodingbitsRG11->data.multiplierG = (unsigned char)roundf(m_fGrnMultiplier);
m_pencodingbitsRG11->data.selectorsG0 = ulliSelectorBitsG >> 40;
m_pencodingbitsRG11->data.selectorsG1 = ulliSelectorBitsG >> 32;
m_pencodingbitsRG11->data.selectorsG2 = ulliSelectorBitsG >> 24;
m_pencodingbitsRG11->data.selectorsG3 = ulliSelectorBitsG >> 16;
m_pencodingbitsRG11->data.selectorsG4 = ulliSelectorBitsG >> 8;
m_pencodingbitsRG11->data.selectorsG5 = ulliSelectorBitsG;
}
// ----------------------------------------------------------------------------------------------------
//
}

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include "EtcBlock4x4Encoding_RGB8.h"
#include "EtcBlock4x4Encoding_R11.h"
namespace Etc
{
class Block4x4EncodingBits_RG11;
// ################################################################################
// Block4x4Encoding_RG11
// ################################################################################
class Block4x4Encoding_RG11 : public Block4x4Encoding_R11
{
float m_fGrnBase;
float m_fGrnMultiplier;
float m_fGrnBlockError;
unsigned int m_auiGrnSelectors[PIXELS];
unsigned int m_uiGrnModifierTableIndex;
public:
Block4x4Encoding_RG11(void);
virtual ~Block4x4Encoding_RG11(void);
virtual void InitFromSource(Block4x4 *a_pblockParent,
ColorFloatRGBA *a_pafrgbaSource,
unsigned char *a_paucEncodingBits, ErrorMetric a_errormetric);
virtual void InitFromEncodingBits(Block4x4 *a_pblockParent,
unsigned char *a_paucEncodingBits,
ColorFloatRGBA *a_pafrgbaSource,
ErrorMetric a_errormetric);
virtual void PerformIteration(float a_fEffort);
virtual void SetEncodingBits(void);
Block4x4EncodingBits_RG11 *m_pencodingbitsRG11;
void CalculateG11(unsigned int a_uiSelectorsUsed, float a_fBaseRadius, float a_fMultiplierRadius);
inline float GetGrnBase(void) const
{
return m_fGrnBase;
}
inline float GetGrnMultiplier(void) const
{
return m_fGrnMultiplier;
}
inline int GetGrnTableIndex(void) const
{
return m_uiGrnModifierTableIndex;
}
inline const unsigned int * GetGrnSelectors(void) const
{
return m_auiGrnSelectors;
}
};
// ----------------------------------------------------------------------------------------------------
//
} // namespace Etc

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include "EtcBlock4x4Encoding_ETC1.h"
namespace Etc
{
class Block4x4Encoding_RGB8 : public Block4x4Encoding_ETC1
{
public:
Block4x4Encoding_RGB8(void);
virtual ~Block4x4Encoding_RGB8(void);
virtual void InitFromEncodingBits(Block4x4 *a_pblockParent,
unsigned char *a_paucEncodingBits,
ColorFloatRGBA *a_pafrgbaSource,
ErrorMetric a_errormetric);
virtual void PerformIteration(float a_fEffort);
virtual void SetEncodingBits(void);
inline ColorFloatRGBA GetColor3(void) const
{
return m_frgbaColor3;
}
protected:
static const unsigned int PLANAR_CORNER_COLORS = 3;
static const unsigned int MAX_PLANAR_REGRESSION_SIZE = 4;
static const unsigned int TH_DISTANCES = 8;
static float s_afTHDistanceTable[TH_DISTANCES];
void TryPlanar(unsigned int a_uiRadius);
void TryTAndH(unsigned int a_uiRadius);
void InitFromEncodingBits_Planar(void);
ColorFloatRGBA m_frgbaColor3; // used for planar
void SetEncodingBits_T(void);
void SetEncodingBits_H(void);
void SetEncodingBits_Planar(void);
// state shared between iterations
ColorFloatRGBA m_frgbaOriginalColor1_TAndH;
ColorFloatRGBA m_frgbaOriginalColor2_TAndH;
void CalculateBaseColorsForTAndH(void);
void TryT(unsigned int a_uiRadius);
void TryT_BestSelectorCombination(void);
void TryH(unsigned int a_uiRadius);
void TryH_BestSelectorCombination(void);
private:
void InitFromEncodingBits_T(void);
void InitFromEncodingBits_H(void);
void CalculatePlanarCornerColors(void);
void ColorRegression(ColorFloatRGBA *a_pafrgbaPixels, unsigned int a_uiPixels,
ColorFloatRGBA *a_pfrgbaSlope, ColorFloatRGBA *a_pfrgbaOffset);
bool TwiddlePlanar(void);
bool TwiddlePlanarR();
bool TwiddlePlanarG();
bool TwiddlePlanarB();
void DecodePixels_T(void);
void DecodePixels_H(void);
void DecodePixels_Planar(void);
};
} // namespace Etc

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include "EtcBlock4x4Encoding_RGB8.h"
#include "EtcErrorMetric.h"
#include "EtcBlock4x4EncodingBits.h"
namespace Etc
{
// ################################################################################
// Block4x4Encoding_RGB8A1
// RGB8A1 if not completely opaque or transparent
// ################################################################################
class Block4x4Encoding_RGB8A1 : public Block4x4Encoding_RGB8
{
public:
static const unsigned int TRANSPARENT_SELECTOR = 2;
Block4x4Encoding_RGB8A1(void);
virtual ~Block4x4Encoding_RGB8A1(void);
virtual void InitFromSource(Block4x4 *a_pblockParent,
ColorFloatRGBA *a_pafrgbaSource,
unsigned char *a_paucEncodingBits,
ErrorMetric a_errormetric);
virtual void InitFromEncodingBits(Block4x4 *a_pblockParent,
unsigned char *a_paucEncodingBits,
ColorFloatRGBA *a_pafrgbaSource,
ErrorMetric a_errormetric);
virtual void PerformIteration(float a_fEffort);
virtual void SetEncodingBits(void);
void InitFromEncodingBits_ETC1(Block4x4 *a_pblockParent,
unsigned char *a_paucEncodingBits,
ColorFloatRGBA *a_pafrgbaSource,
ErrorMetric a_errormetric);
void InitFromEncodingBits_T(void);
void InitFromEncodingBits_H(void);
void PerformFirstIteration(void);
void Decode_ETC1(void);
void DecodePixels_T(void);
void DecodePixels_H(void);
void SetEncodingBits_ETC1(void);
void SetEncodingBits_T(void);
void SetEncodingBits_H(void);
protected:
bool m_boolOpaque; // all source pixels have alpha >= 0.5
bool m_boolTransparent; // all source pixels have alpha < 0.5
bool m_boolPunchThroughPixels; // some source pixels have alpha < 0.5
static float s_aafCwOpaqueUnsetTable[CW_RANGES][SELECTORS];
private:
void TryDifferential(bool a_boolFlip, unsigned int a_uiRadius,
int a_iGrayOffset1, int a_iGrayOffset2);
void TryDifferentialHalf(DifferentialTrys::Half *a_phalf);
void TryT(unsigned int a_uiRadius);
void TryT_BestSelectorCombination(void);
void TryH(unsigned int a_uiRadius);
void TryH_BestSelectorCombination(void);
void TryDegenerates1(void);
void TryDegenerates2(void);
void TryDegenerates3(void);
void TryDegenerates4(void);
};
// ################################################################################
// Block4x4Encoding_RGB8A1_Opaque
// RGB8A1 if all pixels have alpha==1
// ################################################################################
class Block4x4Encoding_RGB8A1_Opaque : public Block4x4Encoding_RGB8A1
{
public:
virtual void PerformIteration(float a_fEffort);
void PerformFirstIteration(void);
private:
};
// ################################################################################
// Block4x4Encoding_RGB8A1_Transparent
// RGB8A1 if all pixels have alpha==0
// ################################################################################
class Block4x4Encoding_RGB8A1_Transparent : public Block4x4Encoding_RGB8A1
{
public:
virtual void PerformIteration(float a_fEffort);
private:
};
} // namespace Etc

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
EtcBlock4x4Encoding_RGBA8.cpp contains:
Block4x4Encoding_RGBA8
Block4x4Encoding_RGBA8_Opaque
Block4x4Encoding_RGBA8_Transparent
These encoders are used when targetting file format RGBA8.
Block4x4Encoding_RGBA8_Opaque is used when all pixels in the 4x4 block are opaque
Block4x4Encoding_RGBA8_Transparent is used when all pixels in the 4x4 block are transparent
Block4x4Encoding_RGBA8 is used when there is a mixture of alphas in the 4x4 block
*/
#include "EtcConfig.h"
#include "EtcBlock4x4Encoding_RGBA8.h"
#include "EtcBlock4x4EncodingBits.h"
#include "EtcBlock4x4.h"
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <float.h>
#include <limits>
namespace Etc
{
// ####################################################################################################
// Block4x4Encoding_RGBA8
// ####################################################################################################
float Block4x4Encoding_RGBA8::s_aafModifierTable[MODIFIER_TABLE_ENTRYS][ALPHA_SELECTORS]
{
{ -3.0f / 255.0f, -6.0f / 255.0f, -9.0f / 255.0f, -15.0f / 255.0f, 2.0f / 255.0f, 5.0f / 255.0f, 8.0f / 255.0f, 14.0f / 255.0f },
{ -3.0f / 255.0f, -7.0f / 255.0f, -10.0f / 255.0f, -13.0f / 255.0f, 2.0f / 255.0f, 6.0f / 255.0f, 9.0f / 255.0f, 12.0f / 255.0f },
{ -2.0f / 255.0f, -5.0f / 255.0f, -8.0f / 255.0f, -13.0f / 255.0f, 1.0f / 255.0f, 4.0f / 255.0f, 7.0f / 255.0f, 12.0f / 255.0f },
{ -2.0f / 255.0f, -4.0f / 255.0f, -6.0f / 255.0f, -13.0f / 255.0f, 1.0f / 255.0f, 3.0f / 255.0f, 5.0f / 255.0f, 12.0f / 255.0f },
{ -3.0f / 255.0f, -6.0f / 255.0f, -8.0f / 255.0f, -12.0f / 255.0f, 2.0f / 255.0f, 5.0f / 255.0f, 7.0f / 255.0f, 11.0f / 255.0f },
{ -3.0f / 255.0f, -7.0f / 255.0f, -9.0f / 255.0f, -11.0f / 255.0f, 2.0f / 255.0f, 6.0f / 255.0f, 8.0f / 255.0f, 10.0f / 255.0f },
{ -4.0f / 255.0f, -7.0f / 255.0f, -8.0f / 255.0f, -11.0f / 255.0f, 3.0f / 255.0f, 6.0f / 255.0f, 7.0f / 255.0f, 10.0f / 255.0f },
{ -3.0f / 255.0f, -5.0f / 255.0f, -8.0f / 255.0f, -11.0f / 255.0f, 2.0f / 255.0f, 4.0f / 255.0f, 7.0f / 255.0f, 10.0f / 255.0f },
{ -2.0f / 255.0f, -6.0f / 255.0f, -8.0f / 255.0f, -10.0f / 255.0f, 1.0f / 255.0f, 5.0f / 255.0f, 7.0f / 255.0f, 9.0f / 255.0f },
{ -2.0f / 255.0f, -5.0f / 255.0f, -8.0f / 255.0f, -10.0f / 255.0f, 1.0f / 255.0f, 4.0f / 255.0f, 7.0f / 255.0f, 9.0f / 255.0f },
{ -2.0f / 255.0f, -4.0f / 255.0f, -8.0f / 255.0f, -10.0f / 255.0f, 1.0f / 255.0f, 3.0f / 255.0f, 7.0f / 255.0f, 9.0f / 255.0f },
{ -2.0f / 255.0f, -5.0f / 255.0f, -7.0f / 255.0f, -10.0f / 255.0f, 1.0f / 255.0f, 4.0f / 255.0f, 6.0f / 255.0f, 9.0f / 255.0f },
{ -3.0f / 255.0f, -4.0f / 255.0f, -7.0f / 255.0f, -10.0f / 255.0f, 2.0f / 255.0f, 3.0f / 255.0f, 6.0f / 255.0f, 9.0f / 255.0f },
{ -1.0f / 255.0f, -2.0f / 255.0f, -3.0f / 255.0f, -10.0f / 255.0f, 0.0f / 255.0f, 1.0f / 255.0f, 2.0f / 255.0f, 9.0f / 255.0f },
{ -4.0f / 255.0f, -6.0f / 255.0f, -8.0f / 255.0f, -9.0f / 255.0f, 3.0f / 255.0f, 5.0f / 255.0f, 7.0f / 255.0f, 8.0f / 255.0f },
{ -3.0f / 255.0f, -5.0f / 255.0f, -7.0f / 255.0f, -9.0f / 255.0f, 2.0f / 255.0f, 4.0f / 255.0f, 6.0f / 255.0f, 8.0f / 255.0f }
};
// ----------------------------------------------------------------------------------------------------
//
Block4x4Encoding_RGBA8::Block4x4Encoding_RGBA8(void)
{
m_pencodingbitsA8 = nullptr;
}
Block4x4Encoding_RGBA8::~Block4x4Encoding_RGBA8(void) {}
// ----------------------------------------------------------------------------------------------------
// initialization prior to encoding
// a_pblockParent points to the block associated with this encoding
// a_errormetric is used to choose the best encoding
// a_pafrgbaSource points to a 4x4 block subset of the source image
// a_paucEncodingBits points to the final encoding bits
//
void Block4x4Encoding_RGBA8::InitFromSource(Block4x4 *a_pblockParent,
ColorFloatRGBA *a_pafrgbaSource,
unsigned char *a_paucEncodingBits, ErrorMetric a_errormetric)
{
Block4x4Encoding::Init(a_pblockParent, a_pafrgbaSource,a_errormetric);
m_pencodingbitsA8 = (Block4x4EncodingBits_A8 *)a_paucEncodingBits;
m_pencodingbitsRGB8 = (Block4x4EncodingBits_RGB8 *)(a_paucEncodingBits + sizeof(Block4x4EncodingBits_A8));
}
// ----------------------------------------------------------------------------------------------------
// initialization from the encoding bits of a previous encoding
// a_pblockParent points to the block associated with this encoding
// a_errormetric is used to choose the best encoding
// a_pafrgbaSource points to a 4x4 block subset of the source image
// a_paucEncodingBits points to the final encoding bits of a previous encoding
//
void Block4x4Encoding_RGBA8::InitFromEncodingBits(Block4x4 *a_pblockParent,
unsigned char *a_paucEncodingBits,
ColorFloatRGBA *a_pafrgbaSource,
ErrorMetric a_errormetric)
{
m_pencodingbitsA8 = (Block4x4EncodingBits_A8 *)a_paucEncodingBits;
m_pencodingbitsRGB8 = (Block4x4EncodingBits_RGB8 *)(a_paucEncodingBits + sizeof(Block4x4EncodingBits_A8));
// init RGB portion
Block4x4Encoding_RGB8::InitFromEncodingBits(a_pblockParent,
(unsigned char *) m_pencodingbitsRGB8,
a_pafrgbaSource,
a_errormetric);
// init A8 portion
// has to be done after InitFromEncodingBits()
{
m_fBase = m_pencodingbitsA8->data.base / 255.0f;
m_fMultiplier = (float)m_pencodingbitsA8->data.multiplier;
m_uiModifierTableIndex = m_pencodingbitsA8->data.table;
unsigned long long int ulliSelectorBits = 0;
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsA8->data.selectors0 << 40;
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsA8->data.selectors1 << 32;
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsA8->data.selectors2 << 24;
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsA8->data.selectors3 << 16;
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsA8->data.selectors4 << 8;
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsA8->data.selectors5;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
unsigned int uiShift = 45 - (3 * uiPixel);
m_auiAlphaSelectors[uiPixel] = (ulliSelectorBits >> uiShift) & (ALPHA_SELECTORS - 1);
}
// decode the alphas
// calc alpha error
m_fError = 0.0f;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
m_afDecodedAlphas[uiPixel] = DecodePixelAlpha(m_fBase, m_fMultiplier,
m_uiModifierTableIndex,
m_auiAlphaSelectors[uiPixel]);
float fDeltaAlpha = m_afDecodedAlphas[uiPixel] - m_pafrgbaSource[uiPixel].fA;
m_fError += fDeltaAlpha * fDeltaAlpha;
}
}
// redo error calc to include alpha
CalcBlockError();
}
// ----------------------------------------------------------------------------------------------------
// perform a single encoding iteration
// replace the encoding if a better encoding was found
// subsequent iterations generally take longer for each iteration
// set m_boolDone if encoding is perfect or encoding is finished based on a_fEffort
//
// similar to Block4x4Encoding_RGB8_Base::Encode_RGB8(), but with alpha added
//
void Block4x4Encoding_RGBA8::PerformIteration(float a_fEffort)
{
assert(!m_boolDone);
if (m_uiEncodingIterations == 0)
{
if (a_fEffort < 24.9f)
{
CalculateA8(0.0f);
}
else if (a_fEffort < 49.9f)
{
CalculateA8(1.0f);
}
else
{
CalculateA8(2.0f);
}
}
Block4x4Encoding_RGB8::PerformIteration(a_fEffort);
}
// ----------------------------------------------------------------------------------------------------
// find the best combination of base alpga, multiplier and selectors
//
// a_fRadius limits the range of base alpha to try
//
void Block4x4Encoding_RGBA8::CalculateA8(float a_fRadius)
{
// find min/max alpha
float fMinAlpha = 1.0f;
float fMaxAlpha = 0.0f;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
float fAlpha = m_pafrgbaSource[uiPixel].fA;
// ignore border pixels
if (isnan(fAlpha))
{
continue;
}
if (fAlpha < fMinAlpha)
{
fMinAlpha = fAlpha;
}
if (fAlpha > fMaxAlpha)
{
fMaxAlpha = fAlpha;
}
}
assert(fMinAlpha <= fMaxAlpha);
float fAlphaRange = fMaxAlpha - fMinAlpha;
// try each modifier table entry
m_fError = FLT_MAX; // artificially high value
for (unsigned int uiTableEntry = 0; uiTableEntry < MODIFIER_TABLE_ENTRYS; uiTableEntry++)
{
static const unsigned int MIN_VALUE_SELECTOR = 3;
static const unsigned int MAX_VALUE_SELECTOR = 7;
float fTableEntryCenter = -s_aafModifierTable[uiTableEntry][MIN_VALUE_SELECTOR];
float fTableEntryRange = s_aafModifierTable[uiTableEntry][MAX_VALUE_SELECTOR] -
s_aafModifierTable[uiTableEntry][MIN_VALUE_SELECTOR];
float fCenterRatio = fTableEntryCenter / fTableEntryRange;
float fCenter = fMinAlpha + fCenterRatio*fAlphaRange;
fCenter = roundf(255.0f * fCenter) / 255.0f;
float fMinBase = fCenter - (a_fRadius / 255.0f);
if (fMinBase < 0.0f)
{
fMinBase = 0.0f;
}
float fMaxBase = fCenter + (a_fRadius / 255.0f);
if (fMaxBase > 1.0f)
{
fMaxBase = 1.0f;
}
for (float fBase = fMinBase; fBase <= fMaxBase; fBase += (0.999999f / 255.0f))
{
float fRangeMultiplier = roundf(fAlphaRange / fTableEntryRange);
float fMinMultiplier = fRangeMultiplier - a_fRadius;
if (fMinMultiplier < 1.0f)
{
fMinMultiplier = 1.0f;
}
else if (fMinMultiplier > 15.0f)
{
fMinMultiplier = 15.0f;
}
float fMaxMultiplier = fRangeMultiplier + a_fRadius;
if (fMaxMultiplier < 1.0f)
{
fMaxMultiplier = 1.0f;
}
else if (fMaxMultiplier > 15.0f)
{
fMaxMultiplier = 15.0f;
}
for (float fMultiplier = fMinMultiplier; fMultiplier <= fMaxMultiplier; fMultiplier += 1.0f)
{
// find best selector for each pixel
unsigned int auiBestSelectors[PIXELS];
float afBestAlphaError[PIXELS];
float afBestDecodedAlphas[PIXELS];
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
float fBestPixelAlphaError = FLT_MAX;
for (unsigned int uiSelector = 0; uiSelector < ALPHA_SELECTORS; uiSelector++)
{
float fDecodedAlpha = DecodePixelAlpha(fBase, fMultiplier, uiTableEntry, uiSelector);
// border pixels (NAN) should have zero error
float fPixelDeltaAlpha = isnan(m_pafrgbaSource[uiPixel].fA) ?
0.0f :
fDecodedAlpha - m_pafrgbaSource[uiPixel].fA;
float fPixelAlphaError = fPixelDeltaAlpha * fPixelDeltaAlpha;
if (fPixelAlphaError < fBestPixelAlphaError)
{
fBestPixelAlphaError = fPixelAlphaError;
auiBestSelectors[uiPixel] = uiSelector;
afBestAlphaError[uiPixel] = fBestPixelAlphaError;
afBestDecodedAlphas[uiPixel] = fDecodedAlpha;
}
}
}
float fBlockError = 0.0f;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
fBlockError += afBestAlphaError[uiPixel];
}
if (fBlockError < m_fError)
{
m_fError = fBlockError;
m_fBase = fBase;
m_fMultiplier = fMultiplier;
m_uiModifierTableIndex = uiTableEntry;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
m_auiAlphaSelectors[uiPixel] = auiBestSelectors[uiPixel];
m_afDecodedAlphas[uiPixel] = afBestDecodedAlphas[uiPixel];
}
}
}
}
}
}
// ----------------------------------------------------------------------------------------------------
// set the encoding bits based on encoding state
//
void Block4x4Encoding_RGBA8::SetEncodingBits(void)
{
// set the RGB8 portion
Block4x4Encoding_RGB8::SetEncodingBits();
// set the A8 portion
{
m_pencodingbitsA8->data.base = (unsigned char)roundf(255.0f * m_fBase);
m_pencodingbitsA8->data.table = m_uiModifierTableIndex;
m_pencodingbitsA8->data.multiplier = (unsigned char)roundf(m_fMultiplier);
unsigned long long int ulliSelectorBits = 0;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
unsigned int uiShift = 45 - (3 * uiPixel);
ulliSelectorBits |= ((unsigned long long int)m_auiAlphaSelectors[uiPixel]) << uiShift;
}
m_pencodingbitsA8->data.selectors0 = ulliSelectorBits >> 40;
m_pencodingbitsA8->data.selectors1 = ulliSelectorBits >> 32;
m_pencodingbitsA8->data.selectors2 = ulliSelectorBits >> 24;
m_pencodingbitsA8->data.selectors3 = ulliSelectorBits >> 16;
m_pencodingbitsA8->data.selectors4 = ulliSelectorBits >> 8;
m_pencodingbitsA8->data.selectors5 = ulliSelectorBits;
}
}
// ####################################################################################################
// Block4x4Encoding_RGBA8_Opaque
// ####################################################################################################
// ----------------------------------------------------------------------------------------------------
// perform a single encoding iteration
// replace the encoding if a better encoding was found
// subsequent iterations generally take longer for each iteration
// set m_boolDone if encoding is perfect or encoding is finished based on a_fEffort
//
void Block4x4Encoding_RGBA8_Opaque::PerformIteration(float a_fEffort)
{
assert(!m_boolDone);
if (m_uiEncodingIterations == 0)
{
m_fError = 0.0f;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
m_afDecodedAlphas[uiPixel] = 1.0f;
}
}
Block4x4Encoding_RGB8::PerformIteration(a_fEffort);
}
// ----------------------------------------------------------------------------------------------------
// set the encoding bits based on encoding state
//
void Block4x4Encoding_RGBA8_Opaque::SetEncodingBits(void)
{
// set the RGB8 portion
Block4x4Encoding_RGB8::SetEncodingBits();
// set the A8 portion
m_pencodingbitsA8->data.base = 255;
m_pencodingbitsA8->data.table = 15;
m_pencodingbitsA8->data.multiplier = 15;
m_pencodingbitsA8->data.selectors0 = 0xFF;
m_pencodingbitsA8->data.selectors1 = 0xFF;
m_pencodingbitsA8->data.selectors2 = 0xFF;
m_pencodingbitsA8->data.selectors3 = 0xFF;
m_pencodingbitsA8->data.selectors4 = 0xFF;
m_pencodingbitsA8->data.selectors5 = 0xFF;
}
// ####################################################################################################
// Block4x4Encoding_RGBA8_Transparent
// ####################################################################################################
// ----------------------------------------------------------------------------------------------------
// perform a single encoding iteration
// replace the encoding if a better encoding was found
// subsequent iterations generally take longer for each iteration
// set m_boolDone if encoding is perfect or encoding is finished based on a_fEffort
//
void Block4x4Encoding_RGBA8_Transparent::PerformIteration(float )
{
assert(!m_boolDone);
assert(m_uiEncodingIterations == 0);
m_mode = MODE_ETC1;
m_boolDiff = true;
m_boolFlip = false;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
m_afrgbaDecodedColors[uiPixel] = ColorFloatRGBA();
m_afDecodedAlphas[uiPixel] = 0.0f;
}
m_fError = 0.0f;
m_boolDone = true;
m_uiEncodingIterations++;
}
// ----------------------------------------------------------------------------------------------------
// set the encoding bits based on encoding state
//
void Block4x4Encoding_RGBA8_Transparent::SetEncodingBits(void)
{
Block4x4Encoding_RGB8::SetEncodingBits();
// set the A8 portion
m_pencodingbitsA8->data.base = 0;
m_pencodingbitsA8->data.table = 0;
m_pencodingbitsA8->data.multiplier = 1;
m_pencodingbitsA8->data.selectors0 = 0;
m_pencodingbitsA8->data.selectors1 = 0;
m_pencodingbitsA8->data.selectors2 = 0;
m_pencodingbitsA8->data.selectors3 = 0;
m_pencodingbitsA8->data.selectors4 = 0;
m_pencodingbitsA8->data.selectors5 = 0;
}
// ----------------------------------------------------------------------------------------------------
//
}

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include "EtcBlock4x4Encoding_RGB8.h"
namespace Etc
{
class Block4x4EncodingBits_A8;
// ################################################################################
// Block4x4Encoding_RGBA8
// RGBA8 if not completely opaque or transparent
// ################################################################################
class Block4x4Encoding_RGBA8 : public Block4x4Encoding_RGB8
{
public:
Block4x4Encoding_RGBA8(void);
virtual ~Block4x4Encoding_RGBA8(void);
virtual void InitFromSource(Block4x4 *a_pblockParent,
ColorFloatRGBA *a_pafrgbaSource,
unsigned char *a_paucEncodingBits, ErrorMetric a_errormetric);
virtual void InitFromEncodingBits(Block4x4 *a_pblockParent,
unsigned char *a_paucEncodingBits,
ColorFloatRGBA *a_pafrgbaSource,
ErrorMetric a_errormetric);
virtual void PerformIteration(float a_fEffort);
virtual void SetEncodingBits(void);
protected:
static const unsigned int MODIFIER_TABLE_ENTRYS = 16;
static const unsigned int ALPHA_SELECTOR_BITS = 3;
static const unsigned int ALPHA_SELECTORS = 1 << ALPHA_SELECTOR_BITS;
static float s_aafModifierTable[MODIFIER_TABLE_ENTRYS][ALPHA_SELECTORS];
void CalculateA8(float a_fRadius);
Block4x4EncodingBits_A8 *m_pencodingbitsA8; // A8 portion of Block4x4EncodingBits_RGBA8
float m_fBase;
float m_fMultiplier;
unsigned int m_uiModifierTableIndex;
unsigned int m_auiAlphaSelectors[PIXELS];
private:
inline float DecodePixelAlpha(float a_fBase, float a_fMultiplier,
unsigned int a_uiTableIndex, unsigned int a_uiSelector)
{
float fPixelAlpha = a_fBase +
a_fMultiplier*s_aafModifierTable[a_uiTableIndex][a_uiSelector];
if (fPixelAlpha < 0.0f)
{
fPixelAlpha = 0.0f;
}
else if (fPixelAlpha > 1.0f)
{
fPixelAlpha = 1.0f;
}
return fPixelAlpha;
}
};
// ################################################################################
// Block4x4Encoding_RGBA8_Opaque
// RGBA8 if all pixels have alpha==1
// ################################################################################
class Block4x4Encoding_RGBA8_Opaque : public Block4x4Encoding_RGBA8
{
public:
virtual void PerformIteration(float a_fEffort);
virtual void SetEncodingBits(void);
};
// ################################################################################
// Block4x4Encoding_RGBA8_Transparent
// RGBA8 if all pixels have alpha==0
// ################################################################################
class Block4x4Encoding_RGBA8_Transparent : public Block4x4Encoding_RGBA8
{
public:
virtual void PerformIteration(float a_fEffort);
virtual void SetEncodingBits(void);
};
// ----------------------------------------------------------------------------------------------------
//
} // namespace Etc

64
thirdparty/etc2comp/EtcColor.h vendored Normal file
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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <math.h>
namespace Etc
{
inline float LogToLinear(float a_fLog)
{
static const float ALPHA = 0.055f;
static const float ONE_PLUS_ALPHA = 1.0f + ALPHA;
if (a_fLog <= 0.04045f)
{
return a_fLog / 12.92f;
}
else
{
return powf((a_fLog + ALPHA) / ONE_PLUS_ALPHA, 2.4f);
}
}
inline float LinearToLog(float &a_fLinear)
{
static const float ALPHA = 0.055f;
static const float ONE_PLUS_ALPHA = 1.0f + ALPHA;
if (a_fLinear <= 0.0031308f)
{
return 12.92f * a_fLinear;
}
else
{
return ONE_PLUS_ALPHA * powf(a_fLinear, (1.0f/2.4f)) - ALPHA;
}
}
class ColorR8G8B8A8
{
public:
unsigned char ucR;
unsigned char ucG;
unsigned char ucB;
unsigned char ucA;
};
}

321
thirdparty/etc2comp/EtcColorFloatRGBA.h vendored Normal file
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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include "EtcConfig.h"
#include "EtcColor.h"
#include <math.h>
namespace Etc
{
class ColorFloatRGBA
{
public:
ColorFloatRGBA(void)
{
fR = fG = fB = fA = 0.0f;
}
ColorFloatRGBA(float a_fR, float a_fG, float a_fB, float a_fA)
{
fR = a_fR;
fG = a_fG;
fB = a_fB;
fA = a_fA;
}
inline ColorFloatRGBA operator+(ColorFloatRGBA& a_rfrgba)
{
ColorFloatRGBA frgba;
frgba.fR = fR + a_rfrgba.fR;
frgba.fG = fG + a_rfrgba.fG;
frgba.fB = fB + a_rfrgba.fB;
frgba.fA = fA + a_rfrgba.fA;
return frgba;
}
inline ColorFloatRGBA operator+(float a_f)
{
ColorFloatRGBA frgba;
frgba.fR = fR + a_f;
frgba.fG = fG + a_f;
frgba.fB = fB + a_f;
frgba.fA = fA;
return frgba;
}
inline ColorFloatRGBA operator-(float a_f)
{
ColorFloatRGBA frgba;
frgba.fR = fR - a_f;
frgba.fG = fG - a_f;
frgba.fB = fB - a_f;
frgba.fA = fA;
return frgba;
}
inline ColorFloatRGBA operator-(ColorFloatRGBA& a_rfrgba)
{
ColorFloatRGBA frgba;
frgba.fR = fR - a_rfrgba.fR;
frgba.fG = fG - a_rfrgba.fG;
frgba.fB = fB - a_rfrgba.fB;
frgba.fA = fA - a_rfrgba.fA;
return frgba;
}
inline ColorFloatRGBA operator*(float a_f)
{
ColorFloatRGBA frgba;
frgba.fR = fR * a_f;
frgba.fG = fG * a_f;
frgba.fB = fB * a_f;
frgba.fA = fA;
return frgba;
}
inline ColorFloatRGBA ScaleRGB(float a_f)
{
ColorFloatRGBA frgba;
frgba.fR = a_f * fR;
frgba.fG = a_f * fG;
frgba.fB = a_f * fB;
frgba.fA = fA;
return frgba;
}
inline ColorFloatRGBA RoundRGB(void)
{
ColorFloatRGBA frgba;
frgba.fR = roundf(fR);
frgba.fG = roundf(fG);
frgba.fB = roundf(fB);
return frgba;
}
inline ColorFloatRGBA ToLinear()
{
ColorFloatRGBA frgbaLinear;
frgbaLinear.fR = LogToLinear(fR);
frgbaLinear.fG = LogToLinear(fG);
frgbaLinear.fB = LogToLinear(fB);
frgbaLinear.fA = fA;
return frgbaLinear;
}
inline ColorFloatRGBA ToLog(void)
{
ColorFloatRGBA frgbaLog;
frgbaLog.fR = LinearToLog(fR);
frgbaLog.fG = LinearToLog(fG);
frgbaLog.fB = LinearToLog(fB);
frgbaLog.fA = fA;
return frgbaLog;
}
inline static ColorFloatRGBA ConvertFromRGBA8(unsigned char a_ucR,
unsigned char a_ucG, unsigned char a_ucB, unsigned char a_ucA)
{
ColorFloatRGBA frgba;
frgba.fR = (float)a_ucR / 255.0f;
frgba.fG = (float)a_ucG / 255.0f;
frgba.fB = (float)a_ucB / 255.0f;
frgba.fA = (float)a_ucA / 255.0f;
return frgba;
}
inline static ColorFloatRGBA ConvertFromRGB4(unsigned char a_ucR4,
unsigned char a_ucG4,
unsigned char a_ucB4)
{
ColorFloatRGBA frgba;
unsigned char ucR8 = (unsigned char)((a_ucR4 << 4) + a_ucR4);
unsigned char ucG8 = (unsigned char)((a_ucG4 << 4) + a_ucG4);
unsigned char ucB8 = (unsigned char)((a_ucB4 << 4) + a_ucB4);
frgba.fR = (float)ucR8 / 255.0f;
frgba.fG = (float)ucG8 / 255.0f;
frgba.fB = (float)ucB8 / 255.0f;
frgba.fA = 1.0f;
return frgba;
}
inline static ColorFloatRGBA ConvertFromRGB5(unsigned char a_ucR5,
unsigned char a_ucG5,
unsigned char a_ucB5)
{
ColorFloatRGBA frgba;
unsigned char ucR8 = (unsigned char)((a_ucR5 << 3) + (a_ucR5 >> 2));
unsigned char ucG8 = (unsigned char)((a_ucG5 << 3) + (a_ucG5 >> 2));
unsigned char ucB8 = (unsigned char)((a_ucB5 << 3) + (a_ucB5 >> 2));
frgba.fR = (float)ucR8 / 255.0f;
frgba.fG = (float)ucG8 / 255.0f;
frgba.fB = (float)ucB8 / 255.0f;
frgba.fA = 1.0f;
return frgba;
}
inline static ColorFloatRGBA ConvertFromR6G7B6(unsigned char a_ucR6,
unsigned char a_ucG7,
unsigned char a_ucB6)
{
ColorFloatRGBA frgba;
unsigned char ucR8 = (unsigned char)((a_ucR6 << 2) + (a_ucR6 >> 4));
unsigned char ucG8 = (unsigned char)((a_ucG7 << 1) + (a_ucG7 >> 6));
unsigned char ucB8 = (unsigned char)((a_ucB6 << 2) + (a_ucB6 >> 4));
frgba.fR = (float)ucR8 / 255.0f;
frgba.fG = (float)ucG8 / 255.0f;
frgba.fB = (float)ucB8 / 255.0f;
frgba.fA = 1.0f;
return frgba;
}
// quantize to 4 bits, expand to 8 bits
inline ColorFloatRGBA QuantizeR4G4B4(void) const
{
ColorFloatRGBA frgba = *this;
// quantize to 4 bits
frgba = frgba.ClampRGB().ScaleRGB(15.0f).RoundRGB();
unsigned int uiR4 = (unsigned int)frgba.fR;
unsigned int uiG4 = (unsigned int)frgba.fG;
unsigned int uiB4 = (unsigned int)frgba.fB;
// expand to 8 bits
frgba.fR = (float) ((uiR4 << 4) + uiR4);
frgba.fG = (float) ((uiG4 << 4) + uiG4);
frgba.fB = (float) ((uiB4 << 4) + uiB4);
frgba = frgba.ScaleRGB(1.0f/255.0f);
return frgba;
}
// quantize to 5 bits, expand to 8 bits
inline ColorFloatRGBA QuantizeR5G5B5(void) const
{
ColorFloatRGBA frgba = *this;
// quantize to 5 bits
frgba = frgba.ClampRGB().ScaleRGB(31.0f).RoundRGB();
unsigned int uiR5 = (unsigned int)frgba.fR;
unsigned int uiG5 = (unsigned int)frgba.fG;
unsigned int uiB5 = (unsigned int)frgba.fB;
// expand to 8 bits
frgba.fR = (float)((uiR5 << 3) + (uiR5 >> 2));
frgba.fG = (float)((uiG5 << 3) + (uiG5 >> 2));
frgba.fB = (float)((uiB5 << 3) + (uiB5 >> 2));
frgba = frgba.ScaleRGB(1.0f / 255.0f);
return frgba;
}
// quantize to 6/7/6 bits, expand to 8 bits
inline ColorFloatRGBA QuantizeR6G7B6(void) const
{
ColorFloatRGBA frgba = *this;
// quantize to 6/7/6 bits
ColorFloatRGBA frgba6 = frgba.ClampRGB().ScaleRGB(63.0f).RoundRGB();
ColorFloatRGBA frgba7 = frgba.ClampRGB().ScaleRGB(127.0f).RoundRGB();
unsigned int uiR6 = (unsigned int)frgba6.fR;
unsigned int uiG7 = (unsigned int)frgba7.fG;
unsigned int uiB6 = (unsigned int)frgba6.fB;
// expand to 8 bits
frgba.fR = (float)((uiR6 << 2) + (uiR6 >> 4));
frgba.fG = (float)((uiG7 << 1) + (uiG7 >> 6));
frgba.fB = (float)((uiB6 << 2) + (uiB6 >> 4));
frgba = frgba.ScaleRGB(1.0f / 255.0f);
return frgba;
}
inline ColorFloatRGBA ClampRGB(void)
{
ColorFloatRGBA frgba = *this;
if (frgba.fR < 0.0f) { frgba.fR = 0.0f; }
if (frgba.fR > 1.0f) { frgba.fR = 1.0f; }
if (frgba.fG < 0.0f) { frgba.fG = 0.0f; }
if (frgba.fG > 1.0f) { frgba.fG = 1.0f; }
if (frgba.fB < 0.0f) { frgba.fB = 0.0f; }
if (frgba.fB > 1.0f) { frgba.fB = 1.0f; }
return frgba;
}
inline ColorFloatRGBA ClampRGBA(void)
{
ColorFloatRGBA frgba = *this;
if (frgba.fR < 0.0f) { frgba.fR = 0.0f; }
if (frgba.fR > 1.0f) { frgba.fR = 1.0f; }
if (frgba.fG < 0.0f) { frgba.fG = 0.0f; }
if (frgba.fG > 1.0f) { frgba.fG = 1.0f; }
if (frgba.fB < 0.0f) { frgba.fB = 0.0f; }
if (frgba.fB > 1.0f) { frgba.fB = 1.0f; }
if (frgba.fA < 0.0f) { frgba.fA = 0.0f; }
if (frgba.fA > 1.0f) { frgba.fA = 1.0f; }
return frgba;
}
inline int IntRed(float a_fScale)
{
return (int)roundf(fR * a_fScale);
}
inline int IntGreen(float a_fScale)
{
return (int)roundf(fG * a_fScale);
}
inline int IntBlue(float a_fScale)
{
return (int)roundf(fB * a_fScale);
}
inline int IntAlpha(float a_fScale)
{
return (int)roundf(fA * a_fScale);
}
float fR, fG, fB, fA;
};
}

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#ifdef _WIN32
#define ETC_WINDOWS (1)
#else
#define ETC_WINDOWS (0)
#endif
#if __APPLE__
#define ETC_OSX (1)
#else
#define ETC_OSX (0)
#endif
#if __unix__
#define ETC_UNIX (1)
#else
#define ETC_UNIX (0)
#endif
// short names for common types
#include <stdint.h>
typedef int8_t i8;
typedef int16_t i16;
typedef int32_t i32;
typedef int64_t i64;
typedef uint8_t u8;
typedef uint16_t u16;
typedef uint32_t u32;
typedef uint64_t u64;
typedef float f32;
typedef double f64;
// Keep asserts enabled in release builds during development
#undef NDEBUG
// 0=disable. stb_image can be used if you need to compress
//other image formats like jpg
#define USE_STB_IMAGE_LOAD 0
#if ETC_WINDOWS
#include <sdkddkver.h>
#define _CRT_SECURE_NO_WARNINGS (1)
#include <tchar.h>
#endif
#include <stdio.h>

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
EtcDifferentialTrys.cpp
Gathers the results of the various encoding trys for both halves of a 4x4 block for Differential mode
*/
#include "EtcConfig.h"
#include "EtcDifferentialTrys.h"
#include <assert.h>
namespace Etc
{
// ----------------------------------------------------------------------------------------------------
// construct a list of trys (encoding attempts)
//
// a_frgbaColor1 is the basecolor for the first half
// a_frgbaColor2 is the basecolor for the second half
// a_pauiPixelMapping1 is the pixel order for the first half
// a_pauiPixelMapping2 is the pixel order for the second half
// a_uiRadius is the amount to vary the base colors
//
DifferentialTrys::DifferentialTrys(ColorFloatRGBA a_frgbaColor1, ColorFloatRGBA a_frgbaColor2,
const unsigned int *a_pauiPixelMapping1,
const unsigned int *a_pauiPixelMapping2,
unsigned int a_uiRadius,
int a_iGrayOffset1, int a_iGrayOffset2)
{
assert(a_uiRadius <= MAX_RADIUS);
m_boolSeverelyBentColors = false;
ColorFloatRGBA frgbaQuantizedColor1 = a_frgbaColor1.QuantizeR5G5B5();
ColorFloatRGBA frgbaQuantizedColor2 = a_frgbaColor2.QuantizeR5G5B5();
// quantize base colors
// ensure that trys with a_uiRadius don't overflow
int iRed1 = MoveAwayFromEdge(frgbaQuantizedColor1.IntRed(31.0f)+a_iGrayOffset1, a_uiRadius);
int iGreen1 = MoveAwayFromEdge(frgbaQuantizedColor1.IntGreen(31.0f) + a_iGrayOffset1, a_uiRadius);
int iBlue1 = MoveAwayFromEdge(frgbaQuantizedColor1.IntBlue(31.0f) + a_iGrayOffset1, a_uiRadius);
int iRed2 = MoveAwayFromEdge(frgbaQuantizedColor2.IntRed(31.0f) + a_iGrayOffset2, a_uiRadius);
int iGreen2 = MoveAwayFromEdge(frgbaQuantizedColor2.IntGreen(31.0f) + a_iGrayOffset2, a_uiRadius);
int iBlue2 = MoveAwayFromEdge(frgbaQuantizedColor2.IntBlue(31.0f) + a_iGrayOffset2, a_uiRadius);
int iDeltaRed = iRed2 - iRed1;
int iDeltaGreen = iGreen2 - iGreen1;
int iDeltaBlue = iBlue2 - iBlue1;
// make sure components are within range
{
if (iDeltaRed > 3)
{
if (iDeltaRed > 7)
{
m_boolSeverelyBentColors = true;
}
iRed1 += (iDeltaRed - 3) / 2;
iRed2 = iRed1 + 3;
iDeltaRed = 3;
}
else if (iDeltaRed < -4)
{
if (iDeltaRed < -8)
{
m_boolSeverelyBentColors = true;
}
iRed1 += (iDeltaRed + 4) / 2;
iRed2 = iRed1 - 4;
iDeltaRed = -4;
}
assert(iRed1 >= (signed)(0 + a_uiRadius) && iRed1 <= (signed)(31 - a_uiRadius));
assert(iRed2 >= (signed)(0 + a_uiRadius) && iRed2 <= (signed)(31 - a_uiRadius));
assert(iDeltaRed >= -4 && iDeltaRed <= 3);
if (iDeltaGreen > 3)
{
if (iDeltaGreen > 7)
{
m_boolSeverelyBentColors = true;
}
iGreen1 += (iDeltaGreen - 3) / 2;
iGreen2 = iGreen1 + 3;
iDeltaGreen = 3;
}
else if (iDeltaGreen < -4)
{
if (iDeltaGreen < -8)
{
m_boolSeverelyBentColors = true;
}
iGreen1 += (iDeltaGreen + 4) / 2;
iGreen2 = iGreen1 - 4;
iDeltaGreen = -4;
}
assert(iGreen1 >= (signed)(0 + a_uiRadius) && iGreen1 <= (signed)(31 - a_uiRadius));
assert(iGreen2 >= (signed)(0 + a_uiRadius) && iGreen2 <= (signed)(31 - a_uiRadius));
assert(iDeltaGreen >= -4 && iDeltaGreen <= 3);
if (iDeltaBlue > 3)
{
if (iDeltaBlue > 7)
{
m_boolSeverelyBentColors = true;
}
iBlue1 += (iDeltaBlue - 3) / 2;
iBlue2 = iBlue1 + 3;
iDeltaBlue = 3;
}
else if (iDeltaBlue < -4)
{
if (iDeltaBlue < -8)
{
m_boolSeverelyBentColors = true;
}
iBlue1 += (iDeltaBlue + 4) / 2;
iBlue2 = iBlue1 - 4;
iDeltaBlue = -4;
}
assert(iBlue1 >= (signed)(0+a_uiRadius) && iBlue1 <= (signed)(31 - a_uiRadius));
assert(iBlue2 >= (signed)(0 + a_uiRadius) && iBlue2 <= (signed)(31 - a_uiRadius));
assert(iDeltaBlue >= -4 && iDeltaBlue <= 3);
}
m_half1.Init(iRed1, iGreen1, iBlue1, a_pauiPixelMapping1, a_uiRadius);
m_half2.Init(iRed2, iGreen2, iBlue2, a_pauiPixelMapping2, a_uiRadius);
}
// ----------------------------------------------------------------------------------------------------
//
void DifferentialTrys::Half::Init(int a_iRed, int a_iGreen, int a_iBlue,
const unsigned int *a_pauiPixelMapping, unsigned int a_uiRadius)
{
m_iRed = a_iRed;
m_iGreen = a_iGreen;
m_iBlue = a_iBlue;
m_pauiPixelMapping = a_pauiPixelMapping;
m_uiRadius = a_uiRadius;
m_uiTrys = 0;
}
// ----------------------------------------------------------------------------------------------------
//
} // namespace Etc

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include "EtcColorFloatRGBA.h"
namespace Etc
{
class DifferentialTrys
{
public:
static const unsigned int MAX_RADIUS = 2;
DifferentialTrys(ColorFloatRGBA a_frgbaColor1,
ColorFloatRGBA a_frgbaColor2,
const unsigned int *a_pauiPixelMapping1,
const unsigned int *a_pauiPixelMapping2,
unsigned int a_uiRadius,
int a_iGrayOffset1, int a_iGrayOffset2);
inline static int MoveAwayFromEdge(int a_i, int a_iDistance)
{
if (a_i < (0+ a_iDistance))
{
return (0 + a_iDistance);
}
else if (a_i > (31- a_iDistance))
{
return (31 - a_iDistance);
}
return a_i;
}
class Try
{
public :
static const unsigned int SELECTORS = 8; // per half
int m_iRed;
int m_iGreen;
int m_iBlue;
unsigned int m_uiCW;
unsigned int m_auiSelectors[SELECTORS];
float m_fError;
};
class Half
{
public:
static const unsigned int MAX_TRYS = 125;
void Init(int a_iRed, int a_iGreen, int a_iBlue,
const unsigned int *a_pauiPixelMapping,
unsigned int a_uiRadius);
// center of trys
int m_iRed;
int m_iGreen;
int m_iBlue;
const unsigned int *m_pauiPixelMapping;
unsigned int m_uiRadius;
unsigned int m_uiTrys;
Try m_atry[MAX_TRYS];
Try *m_ptryBest;
};
Half m_half1;
Half m_half2;
bool m_boolSeverelyBentColors;
};
// ----------------------------------------------------------------------------------------------------
//
} // namespace Etc

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
namespace Etc
{
enum ErrorMetric
{
RGBA,
RGBX,
REC709,
NUMERIC,
NORMALXYZ,
//
ERROR_METRICS,
//
BT709 = REC709
};
inline const char *ErrorMetricToString(ErrorMetric errorMetric)
{
switch (errorMetric)
{
case RGBA:
return "RGBA";
case RGBX:
return "RGBX";
case REC709:
return "REC709";
case NUMERIC:
return "NUMERIC";
case NORMALXYZ:
return "NORMALXYZ";
case ERROR_METRICS:
default:
return "UNKNOWN";
}
}
} // namespace Etc

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifdef _WIN32
#define _CRT_SECURE_NO_WARNINGS (1)
#endif
#include "EtcConfig.h"
#include "EtcFile.h"
#include "EtcFileHeader.h"
#include "EtcColor.h"
#include "Etc.h"
#include "EtcBlock4x4EncodingBits.h"
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <stdlib.h>
using namespace Etc;
// ----------------------------------------------------------------------------------------------------
//
File::File(const char *a_pstrFilename, Format a_fileformat, Image::Format a_imageformat,
unsigned char *a_paucEncodingBits, unsigned int a_uiEncodingBitsBytes,
unsigned int a_uiSourceWidth, unsigned int a_uiSourceHeight,
unsigned int a_uiExtendedWidth, unsigned int a_uiExtendedHeight)
{
if (a_pstrFilename == nullptr)
{
m_pstrFilename = const_cast<char *>("");
}
else
{
m_pstrFilename = new char[strlen(a_pstrFilename) + 1];
strcpy(m_pstrFilename, a_pstrFilename);
}
m_fileformat = a_fileformat;
if (m_fileformat == Format::INFER_FROM_FILE_EXTENSION)
{
// ***** TODO: add this later *****
m_fileformat = Format::KTX;
}
m_imageformat = a_imageformat;
m_uiNumMipmaps = 1;
m_pMipmapImages = new RawImage[m_uiNumMipmaps];
m_pMipmapImages[0].paucEncodingBits = std::shared_ptr<unsigned char>(a_paucEncodingBits, [](unsigned char *p) { delete[] p; } );
m_pMipmapImages[0].uiEncodingBitsBytes = a_uiEncodingBitsBytes;
m_pMipmapImages[0].uiExtendedWidth = a_uiExtendedWidth;
m_pMipmapImages[0].uiExtendedHeight = a_uiExtendedHeight;
m_uiSourceWidth = a_uiSourceWidth;
m_uiSourceHeight = a_uiSourceHeight;
switch (m_fileformat)
{
case Format::PKM:
m_pheader = new FileHeader_Pkm(this);
break;
case Format::KTX:
m_pheader = new FileHeader_Ktx(this);
break;
default:
assert(0);
break;
}
}
// ----------------------------------------------------------------------------------------------------
//
File::File(const char *a_pstrFilename, Format a_fileformat, Image::Format a_imageformat,
unsigned int a_uiNumMipmaps, RawImage *a_pMipmapImages,
unsigned int a_uiSourceWidth, unsigned int a_uiSourceHeight)
{
if (a_pstrFilename == nullptr)
{
m_pstrFilename = const_cast<char *>("");
}
else
{
m_pstrFilename = new char[strlen(a_pstrFilename) + 1];
strcpy(m_pstrFilename, a_pstrFilename);
}
m_fileformat = a_fileformat;
if (m_fileformat == Format::INFER_FROM_FILE_EXTENSION)
{
// ***** TODO: add this later *****
m_fileformat = Format::KTX;
}
m_imageformat = a_imageformat;
m_uiNumMipmaps = a_uiNumMipmaps;
m_pMipmapImages = new RawImage[m_uiNumMipmaps];
for(unsigned int mip = 0; mip < m_uiNumMipmaps; mip++)
{
m_pMipmapImages[mip] = a_pMipmapImages[mip];
}
m_uiSourceWidth = a_uiSourceWidth;
m_uiSourceHeight = a_uiSourceHeight;
switch (m_fileformat)
{
case Format::PKM:
m_pheader = new FileHeader_Pkm(this);
break;
case Format::KTX:
m_pheader = new FileHeader_Ktx(this);
break;
default:
assert(0);
break;
}
}
// ----------------------------------------------------------------------------------------------------
//
File::File(const char *a_pstrFilename, Format a_fileformat)
{
if (a_pstrFilename == nullptr)
{
return;
}
else
{
m_pstrFilename = new char[strlen(a_pstrFilename) + 1];
strcpy(m_pstrFilename, a_pstrFilename);
}
m_fileformat = a_fileformat;
if (m_fileformat == Format::INFER_FROM_FILE_EXTENSION)
{
// ***** TODO: add this later *****
m_fileformat = Format::KTX;
}
FILE *pfile = fopen(m_pstrFilename, "rb");
if (pfile == nullptr)
{
printf("ERROR: Couldn't open %s", m_pstrFilename);
exit(1);
}
fseek(pfile, 0, SEEK_END);
unsigned int fileSize = ftell(pfile);
fseek(pfile, 0, SEEK_SET);
size_t szResult;
m_pheader = new FileHeader_Ktx(this);
szResult = fread( ((FileHeader_Ktx*)m_pheader)->GetData(), 1, sizeof(FileHeader_Ktx::Data), pfile);
assert(szResult > 0);
m_uiNumMipmaps = 1;
m_pMipmapImages = new RawImage[m_uiNumMipmaps];
if (((FileHeader_Ktx*)m_pheader)->GetData()->m_u32BytesOfKeyValueData > 0)
fseek(pfile, ((FileHeader_Ktx*)m_pheader)->GetData()->m_u32BytesOfKeyValueData, SEEK_CUR);
szResult = fread(&m_pMipmapImages->uiEncodingBitsBytes, 1, sizeof(unsigned int), pfile);
assert(szResult > 0);
m_pMipmapImages->paucEncodingBits = std::shared_ptr<unsigned char>(new unsigned char[m_pMipmapImages->uiEncodingBitsBytes], [](unsigned char *p) { delete[] p; } );
assert(ftell(pfile) + m_pMipmapImages->uiEncodingBitsBytes <= fileSize);
szResult = fread(m_pMipmapImages->paucEncodingBits.get(), 1, m_pMipmapImages->uiEncodingBitsBytes, pfile);
assert(szResult == m_pMipmapImages->uiEncodingBitsBytes);
uint32_t uiInternalFormat = ((FileHeader_Ktx*)m_pheader)->GetData()->m_u32GlInternalFormat;
uint32_t uiBaseInternalFormat = ((FileHeader_Ktx*)m_pheader)->GetData()->m_u32GlBaseInternalFormat;
if (uiInternalFormat == (uint32_t)FileHeader_Ktx::InternalFormat::ETC1_RGB8 && uiBaseInternalFormat == (uint32_t)FileHeader_Ktx::BaseInternalFormat::ETC1_RGB8)
{
m_imageformat = Image::Format::ETC1;
}
else if (uiInternalFormat == (uint32_t)FileHeader_Ktx::InternalFormat::ETC2_RGB8 && uiBaseInternalFormat == (uint32_t)FileHeader_Ktx::BaseInternalFormat::ETC2_RGB8)
{
m_imageformat = Image::Format::RGB8;
}
else if (uiInternalFormat == (uint32_t)FileHeader_Ktx::InternalFormat::ETC2_RGB8A1 && uiBaseInternalFormat == (uint32_t)FileHeader_Ktx::BaseInternalFormat::ETC2_RGB8A1)
{
m_imageformat = Image::Format::RGB8A1;
}
else if (uiInternalFormat == (uint32_t)FileHeader_Ktx::InternalFormat::ETC2_RGBA8 && uiBaseInternalFormat == (uint32_t)FileHeader_Ktx::BaseInternalFormat::ETC2_RGBA8)
{
m_imageformat = Image::Format::RGBA8;
}
else if (uiInternalFormat == (uint32_t)FileHeader_Ktx::InternalFormat::ETC2_R11 && uiBaseInternalFormat == (uint32_t)FileHeader_Ktx::BaseInternalFormat::ETC2_R11)
{
m_imageformat = Image::Format::R11;
}
else if (uiInternalFormat == (uint32_t)FileHeader_Ktx::InternalFormat::ETC2_SIGNED_R11 && uiBaseInternalFormat == (uint32_t)FileHeader_Ktx::BaseInternalFormat::ETC2_R11)
{
m_imageformat = Image::Format::SIGNED_R11;
}
else if (uiInternalFormat == (uint32_t)FileHeader_Ktx::InternalFormat::ETC2_RG11 && uiBaseInternalFormat == (uint32_t)FileHeader_Ktx::BaseInternalFormat::ETC2_RG11)
{
m_imageformat = Image::Format::RG11;
}
else if (uiInternalFormat == (uint32_t)FileHeader_Ktx::InternalFormat::ETC2_SIGNED_RG11 && uiBaseInternalFormat == (uint32_t)FileHeader_Ktx::BaseInternalFormat::ETC2_RG11)
{
m_imageformat = Image::Format::SIGNED_RG11;
}
else
{
m_imageformat = Image::Format::UNKNOWN;
}
m_uiSourceWidth = ((FileHeader_Ktx*)m_pheader)->GetData()->m_u32PixelWidth;
m_uiSourceHeight = ((FileHeader_Ktx*)m_pheader)->GetData()->m_u32PixelHeight;
m_pMipmapImages->uiExtendedWidth = Image::CalcExtendedDimension((unsigned short)m_uiSourceWidth);
m_pMipmapImages->uiExtendedHeight = Image::CalcExtendedDimension((unsigned short)m_uiSourceHeight);
unsigned int uiBlocks = m_pMipmapImages->uiExtendedWidth * m_pMipmapImages->uiExtendedHeight / 16;
Block4x4EncodingBits::Format encodingbitsformat = Image::DetermineEncodingBitsFormat(m_imageformat);
unsigned int expectedbytes = uiBlocks * Block4x4EncodingBits::GetBytesPerBlock(encodingbitsformat);
assert(expectedbytes == m_pMipmapImages->uiEncodingBitsBytes);
fclose(pfile);
}
File::~File()
{
if (m_pMipmapImages != nullptr)
{
delete [] m_pMipmapImages;
}
if(m_pstrFilename != nullptr)
{
delete[] m_pstrFilename;
m_pstrFilename = nullptr;
}
if (m_pheader != nullptr)
{
delete m_pheader;
m_pheader = nullptr;
}
}
void File::UseSingleBlock(int a_iPixelX, int a_iPixelY)
{
if (a_iPixelX <= -1 || a_iPixelY <= -1)
return;
if (a_iPixelX >(int) m_uiSourceWidth)
{
//if we are using a ktx thats the size of a single block or less
//then make sure we use the 4x4 image as the single block
if (m_uiSourceWidth <= 4)
{
a_iPixelX = 0;
}
else
{
printf("blockAtHV: H coordinate out of range, capped to image width\n");
a_iPixelX = m_uiSourceWidth - 1;
}
}
if (a_iPixelY >(int) m_uiSourceHeight)
{
//if we are using a ktx thats the size of a single block or less
//then make sure we use the 4x4 image as the single block
if (m_uiSourceHeight <= 4)
{
a_iPixelY= 0;
}
else
{
printf("blockAtHV: V coordinate out of range, capped to image height\n");
a_iPixelY = m_uiSourceHeight - 1;
}
}
unsigned int origWidth = m_uiSourceWidth;
unsigned int origHeight = m_uiSourceHeight;
m_uiSourceWidth = 4;
m_uiSourceHeight = 4;
Block4x4EncodingBits::Format encodingbitsformat = Image::DetermineEncodingBitsFormat(m_imageformat);
unsigned int uiEncodingBitsBytesPerBlock = Block4x4EncodingBits::GetBytesPerBlock(encodingbitsformat);
int numMipmaps = 1;
RawImage* pMipmapImages = new RawImage[numMipmaps];
pMipmapImages[0].uiExtendedWidth = Image::CalcExtendedDimension((unsigned short)m_uiSourceWidth);
pMipmapImages[0].uiExtendedHeight = Image::CalcExtendedDimension((unsigned short)m_uiSourceHeight);
pMipmapImages[0].uiEncodingBitsBytes = 0;
pMipmapImages[0].paucEncodingBits = std::shared_ptr<unsigned char>(new unsigned char[uiEncodingBitsBytesPerBlock], [](unsigned char *p) { delete[] p; });
//block position in pixels
// remove the bottom 2 bits to get the block coordinates
unsigned int iBlockPosX = (a_iPixelX & 0xFFFFFFFC);
unsigned int iBlockPosY = (a_iPixelY & 0xFFFFFFFC);
int numXBlocks = (origWidth / 4);
int numYBlocks = (origHeight / 4);
// block location
//int iBlockX = (a_iPixelX % 4) == 0 ? a_iPixelX / 4.0f : (a_iPixelX / 4) + 1;
//int iBlockY = (a_iPixelY % 4) == 0 ? a_iPixelY / 4.0f : (a_iPixelY / 4) + 1;
//m_paucEncodingBits += ((iBlockY * numXBlocks) + iBlockX) * uiEncodingBitsBytesPerBlock;
unsigned int num = numXBlocks*numYBlocks;
unsigned int uiH = 0, uiV = 0;
unsigned char* pEncodingBits = m_pMipmapImages[0].paucEncodingBits.get();
for (unsigned int uiBlock = 0; uiBlock < num; uiBlock++)
{
if (uiH == iBlockPosX && uiV == iBlockPosY)
{
memcpy(pMipmapImages[0].paucEncodingBits.get(),pEncodingBits, uiEncodingBitsBytesPerBlock);
break;
}
pEncodingBits += uiEncodingBitsBytesPerBlock;
uiH += 4;
if (uiH >= origWidth)
{
uiH = 0;
uiV += 4;
}
}
delete [] m_pMipmapImages;
m_pMipmapImages = pMipmapImages;
}
// ----------------------------------------------------------------------------------------------------
//
void File::Write()
{
FILE *pfile = fopen(m_pstrFilename, "wb");
if (pfile == nullptr)
{
printf("Error: couldn't open Etc file (%s)\n", m_pstrFilename);
exit(1);
}
m_pheader->Write(pfile);
for(unsigned int mip = 0; mip < m_uiNumMipmaps; mip++)
{
if(m_fileformat == Format::KTX)
{
// Write u32 image size
uint32_t u32ImageSize = m_pMipmapImages[mip].uiEncodingBitsBytes;
uint32_t szBytesWritten = fwrite(&u32ImageSize, 1, sizeof(u32ImageSize), pfile);
assert(szBytesWritten == sizeof(u32ImageSize));
}
unsigned int iResult = (int)fwrite(m_pMipmapImages[mip].paucEncodingBits.get(), 1, m_pMipmapImages[mip].uiEncodingBitsBytes, pfile);
if (iResult != m_pMipmapImages[mip].uiEncodingBitsBytes)
{
printf("Error: couldn't write Etc file (%s)\n", m_pstrFilename);
exit(1);
}
}
fclose(pfile);
}
// ----------------------------------------------------------------------------------------------------
//

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include "EtcColorFloatRGBA.h"
#include "EtcImage.h"
#include "Etc.h"
namespace Etc
{
class FileHeader;
class SourceImage;
class File
{
public:
enum class Format
{
INFER_FROM_FILE_EXTENSION,
PKM,
KTX,
};
File(const char *a_pstrFilename, Format a_fileformat, Image::Format a_imageformat,
unsigned char *a_paucEncodingBits, unsigned int a_uiEncodingBitsBytes,
unsigned int a_uiSourceWidth, unsigned int a_uiSourceHeight,
unsigned int a_uiExtendedWidth, unsigned int a_uiExtendedHeight);
File(const char *a_pstrFilename, Format a_fileformat, Image::Format a_imageformat,
unsigned int a_uiNumMipmaps, RawImage *pMipmapImages,
unsigned int a_uiSourceWidth, unsigned int a_uiSourceHeight );
File(const char *a_pstrFilename, Format a_fileformat);
~File();
const char *GetFilename(void) { return m_pstrFilename; }
void Read(const char *a_pstrFilename);
void Write(void);
inline unsigned int GetSourceWidth(void)
{
return m_uiSourceWidth;
}
inline unsigned int GetSourceHeight(void)
{
return m_uiSourceHeight;
}
inline unsigned int GetExtendedWidth(unsigned int mipmapIndex = 0)
{
if (mipmapIndex < m_uiNumMipmaps)
{
return m_pMipmapImages[mipmapIndex].uiExtendedWidth;
}
else
{
return 0;
}
}
inline unsigned int GetExtendedHeight(unsigned int mipmapIndex = 0)
{
if (mipmapIndex < m_uiNumMipmaps)
{
return m_pMipmapImages[mipmapIndex].uiExtendedHeight;
}
else
{
return 0;
}
}
inline Image::Format GetImageFormat()
{
return m_imageformat;
}
inline unsigned int GetEncodingBitsBytes(unsigned int mipmapIndex = 0)
{
if (mipmapIndex < m_uiNumMipmaps)
{
return m_pMipmapImages[mipmapIndex].uiEncodingBitsBytes;
}
else
{
return 0;
}
}
inline unsigned char* GetEncodingBits(unsigned int mipmapIndex = 0)
{
if( mipmapIndex < m_uiNumMipmaps)
{
return m_pMipmapImages[mipmapIndex].paucEncodingBits.get();
}
else
{
return nullptr;
}
}
inline unsigned int GetNumMipmaps()
{
return m_uiNumMipmaps;
}
void UseSingleBlock(int a_iPixelX = -1, int a_iPixelY = -1);
private:
char *m_pstrFilename; // includes directory path and file extension
Format m_fileformat;
Image::Format m_imageformat;
FileHeader *m_pheader;
unsigned int m_uiNumMipmaps;
RawImage* m_pMipmapImages;
unsigned int m_uiSourceWidth;
unsigned int m_uiSourceHeight;
};
}

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "EtcFileHeader.h"
#include "EtcBlock4x4EncodingBits.h"
#include <assert.h>
namespace Etc
{
// ----------------------------------------------------------------------------------------------------
//
FileHeader_Pkm::FileHeader_Pkm(File *a_pfile)
{
m_pfile = a_pfile;
static const char s_acMagicNumberData[4] = { 'P', 'K', 'M', ' ' };
static const char s_acVersionData[2] = { '1', '0' };
for (unsigned int ui = 0; ui < sizeof(s_acMagicNumberData); ui++)
{
m_data.m_acMagicNumber[ui] = s_acMagicNumberData[ui];
}
for (unsigned int ui = 0; ui < sizeof(s_acVersionData); ui++)
{
m_data.m_acVersion[ui] = s_acVersionData[ui];
}
m_data.m_ucDataType_msb = 0; // ETC1_RGB_NO_MIPMAPS
m_data.m_ucDataType_lsb = 0;
m_data.m_ucOriginalWidth_msb = (unsigned char)(m_pfile->GetSourceWidth() >> 8);
m_data.m_ucOriginalWidth_lsb = m_pfile->GetSourceWidth() & 0xFF;
m_data.m_ucOriginalHeight_msb = (unsigned char)(m_pfile->GetSourceHeight() >> 8);
m_data.m_ucOriginalHeight_lsb = m_pfile->GetSourceHeight() & 0xFF;
m_data.m_ucExtendedWidth_msb = (unsigned char)(m_pfile->GetExtendedWidth() >> 8);
m_data.m_ucExtendedWidth_lsb = m_pfile->GetExtendedWidth() & 0xFF;
m_data.m_ucExtendedHeight_msb = (unsigned char)(m_pfile->GetExtendedHeight() >> 8);
m_data.m_ucExtendedHeight_lsb = m_pfile->GetExtendedHeight() & 0xFF;
}
// ----------------------------------------------------------------------------------------------------
//
void FileHeader_Pkm::Write(FILE *a_pfile)
{
fwrite(&m_data, sizeof(Data), 1, a_pfile);
}
// ----------------------------------------------------------------------------------------------------
//
FileHeader_Ktx::FileHeader_Ktx(File *a_pfile)
{
m_pfile = a_pfile;
static const uint8_t s_au8Itentfier[12] =
{
0xAB, 0x4B, 0x54, 0x58, // first four bytes of Byte[12] identifier
0x20, 0x31, 0x31, 0xBB, // next four bytes of Byte[12] identifier
0x0D, 0x0A, 0x1A, 0x0A // final four bytes of Byte[12] identifier
};
for (unsigned int ui = 0; ui < sizeof(s_au8Itentfier); ui++)
{
m_data.m_au8Identifier[ui] = s_au8Itentfier[ui];
}
m_data.m_u32Endianness = 0x04030201;
m_data.m_u32GlType = 0;
m_data.m_u32GlTypeSize = 1;
m_data.m_u32GlFormat = 0;
switch (m_pfile->GetImageFormat())
{
case Image::Format::RGB8:
case Image::Format::SRGB8:
m_data.m_u32GlInternalFormat = (unsigned int)InternalFormat::ETC2_RGB8;
m_data.m_u32GlBaseInternalFormat = (unsigned int)BaseInternalFormat::ETC2_RGB8;
break;
case Image::Format::RGBA8:
case Image::Format::SRGBA8:
m_data.m_u32GlInternalFormat = (unsigned int)InternalFormat::ETC2_RGBA8;
m_data.m_u32GlBaseInternalFormat = (unsigned int)BaseInternalFormat::ETC2_RGBA8;
break;
case Image::Format::RGB8A1:
case Image::Format::SRGB8A1:
m_data.m_u32GlInternalFormat = (unsigned int)InternalFormat::ETC2_RGB8A1;
m_data.m_u32GlBaseInternalFormat = (unsigned int)BaseInternalFormat::ETC2_RGB8A1;
break;
case Image::Format::R11:
m_data.m_u32GlInternalFormat = (unsigned int)InternalFormat::ETC2_R11;
m_data.m_u32GlBaseInternalFormat = (unsigned int)BaseInternalFormat::ETC2_R11;
break;
case Image::Format::SIGNED_R11:
m_data.m_u32GlInternalFormat = (unsigned int)InternalFormat::ETC2_SIGNED_R11;
m_data.m_u32GlBaseInternalFormat = (unsigned int)BaseInternalFormat::ETC2_R11;
break;
case Image::Format::RG11:
m_data.m_u32GlInternalFormat = (unsigned int)InternalFormat::ETC2_RG11;
m_data.m_u32GlBaseInternalFormat = (unsigned int)BaseInternalFormat::ETC2_RG11;
break;
case Image::Format::SIGNED_RG11:
m_data.m_u32GlInternalFormat = (unsigned int)InternalFormat::ETC2_SIGNED_RG11;
m_data.m_u32GlBaseInternalFormat = (unsigned int)BaseInternalFormat::ETC2_RG11;
break;
default:
m_data.m_u32GlInternalFormat = (unsigned int)InternalFormat::ETC1_RGB8;
m_data.m_u32GlBaseInternalFormat = (unsigned int)BaseInternalFormat::ETC1_RGB8;
break;
}
m_data.m_u32PixelWidth = 0;
m_data.m_u32PixelHeight = 0;
m_data.m_u32PixelDepth = 0;
m_data.m_u32NumberOfArrayElements = 0;
m_data.m_u32NumberOfFaces = 0;
m_data.m_u32BytesOfKeyValueData = 0;
m_pkeyvaluepair = nullptr;
m_u32Images = 0;
m_u32KeyValuePairs = 0;
m_data.m_u32PixelWidth = m_pfile->GetSourceWidth();
m_data.m_u32PixelHeight = m_pfile->GetSourceHeight();
m_data.m_u32PixelDepth = 0;
m_data.m_u32NumberOfArrayElements = 0;
m_data.m_u32NumberOfFaces = 1;
m_data.m_u32NumberOfMipmapLevels = m_pfile->GetNumMipmaps();
}
// ----------------------------------------------------------------------------------------------------
//
void FileHeader_Ktx::Write(FILE *a_pfile)
{
size_t szBytesWritten;
// Write header
szBytesWritten = fwrite(&m_data, 1, sizeof(Data), a_pfile);
assert(szBytesWritten == sizeof(Data));
// Write KeyAndValuePairs
if (m_u32KeyValuePairs)
{
fwrite(m_pkeyvaluepair, m_pkeyvaluepair->u32KeyAndValueByteSize, 1, a_pfile);
}
}
// ----------------------------------------------------------------------------------------------------
//
FileHeader_Ktx::Data *FileHeader_Ktx::GetData()
{
return &m_data;
}
// ----------------------------------------------------------------------------------------------------
//
} // namespace Etc

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include "EtcFile.h"
#include <stdio.h>
#include <inttypes.h>
namespace Etc
{
class Image;
class FileHeader
{
public:
virtual void Write(FILE *a_pfile) = 0;
File GetFile();
virtual ~FileHeader(void) {}
protected:
File *m_pfile;
};
// ----------------------------------------------------------------------------------------------------
//
class FileHeader_Pkm : public FileHeader
{
public:
FileHeader_Pkm(File *a_pfile);
virtual void Write(FILE *a_pfile);
virtual ~FileHeader_Pkm(void) {}
private:
typedef struct
{
char m_acMagicNumber[4];
char m_acVersion[2];
unsigned char m_ucDataType_msb; // e.g. ETC1_RGB_NO_MIPMAPS
unsigned char m_ucDataType_lsb;
unsigned char m_ucExtendedWidth_msb; // padded to 4x4 blocks
unsigned char m_ucExtendedWidth_lsb;
unsigned char m_ucExtendedHeight_msb; // padded to 4x4 blocks
unsigned char m_ucExtendedHeight_lsb;
unsigned char m_ucOriginalWidth_msb;
unsigned char m_ucOriginalWidth_lsb;
unsigned char m_ucOriginalHeight_msb;
unsigned char m_ucOriginalHeight_lsb;
} Data;
Data m_data;
};
// ----------------------------------------------------------------------------------------------------
//
class FileHeader_Ktx : public FileHeader
{
public:
typedef struct
{
uint32_t u32KeyAndValueByteSize;
} KeyValuePair;
typedef struct
{
uint8_t m_au8Identifier[12];
uint32_t m_u32Endianness;
uint32_t m_u32GlType;
uint32_t m_u32GlTypeSize;
uint32_t m_u32GlFormat;
uint32_t m_u32GlInternalFormat;
uint32_t m_u32GlBaseInternalFormat;
uint32_t m_u32PixelWidth;
uint32_t m_u32PixelHeight;
uint32_t m_u32PixelDepth;
uint32_t m_u32NumberOfArrayElements;
uint32_t m_u32NumberOfFaces;
uint32_t m_u32NumberOfMipmapLevels;
uint32_t m_u32BytesOfKeyValueData;
} Data;
enum class InternalFormat
{
ETC1_RGB8 = 0x8D64,
ETC1_ALPHA8 = ETC1_RGB8,
//
ETC2_R11 = 0x9270,
ETC2_SIGNED_R11 = 0x9271,
ETC2_RG11 = 0x9272,
ETC2_SIGNED_RG11 = 0x9273,
ETC2_RGB8 = 0x9274,
ETC2_SRGB8 = 0x9275,
ETC2_RGB8A1 = 0x9276,
ETC2_SRGB8_PUNCHTHROUGH_ALPHA1 = 0x9277,
ETC2_RGBA8 = 0x9278
};
enum class BaseInternalFormat
{
ETC2_R11 = 0x1903,
ETC2_RG11 = 0x8227,
ETC1_RGB8 = 0x1907,
ETC1_ALPHA8 = ETC1_RGB8,
//
ETC2_RGB8 = 0x1907,
ETC2_RGB8A1 = 0x1908,
ETC2_RGBA8 = 0x1908,
};
FileHeader_Ktx(File *a_pfile);
virtual void Write(FILE *a_pfile);
virtual ~FileHeader_Ktx(void) {}
void AddKeyAndValue(KeyValuePair *a_pkeyvaluepair);
Data* GetData();
private:
Data m_data;
KeyValuePair *m_pkeyvaluepair;
uint32_t m_u32Images;
uint32_t m_u32KeyValuePairs;
};
} // namespace Etc

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#include <stdlib.h>
#include <math.h>
#include "EtcFilter.h"
namespace Etc
{
static const double PiConst = 3.14159265358979323846;
inline double sinc(double x)
{
if ( x == 0.0 )
{
return 1.0;
}
return sin(PiConst * x) / (PiConst * x);
}
//inline float sincf( float x )
//{
// x *= F_PI;
// if (x < 0.01f && x > -0.01f)
// {
// return 1.0f + x*x*(-1.0f/6.0f + x*x*1.0f/120.0f);
// }
//
// return sinf(x)/x;
//}
//
//double bessel0(double x)
//{
// const double EPSILON_RATIO = 1E-16;
// double xh, sum, pow, ds;
// int k;
//
// xh = 0.5 * x;
// sum = 1.0;
// pow = 1.0;
// k = 0;
// ds = 1.0;
// while (ds > sum * EPSILON_RATIO)
// {
// ++k;
// pow = pow * (xh / k);
// ds = pow * pow;
// sum = sum + ds;
// }
//
// return sum;
//}
//**--------------------------------------------------------------------------
//** Name: kaiser(double alpha, double half_width, double x)
//** Returns:
//** Description: Alpha controls shape of filter. We are using 4.
//**--------------------------------------------------------------------------
//inline double kaiser(double alpha, double half_width, double x)
//{
// double ratio = (x / half_width);
// return bessel0(alpha * sqrt(1 - ratio * ratio)) / bessel0(alpha);
//}
//
//float Filter_Lanczos4Sinc(float x)
//{
// if (x <= -4.0f || x >= 4.0f) // half-width of 4
// {
// return 0.0;
// }
//
// return sinc(0.875f * x) * sinc(0.25f * x);
//}
//
//double Filter_Kaiser4( double t )
//{
// return kaiser( 4.0, 3.0, t);
//}
//
//double Filter_KaiserOptimal( double t )
//{
// return kaiser( 8.93, 3.0f, t);
//}
double FilterLanczos3( double t )
{
if ( t <= -3.0 || t >= 3.0 )
{
return 0.0;
}
return sinc( t ) * sinc( t / 3.0 );
}
double FilterBox( double t )
{
return ( t > -0.5 && t < 0.5) ? 1.0 : 0.0;
}
double FilterLinear( double t )
{
if (t < 0.0) t = -t;
return (t < 1.0) ? (1.0 - t) : 0.0;
}
//**--------------------------------------------------------------------------
//** Name: CalcContributions( int srcSize,
//** int destSize,
//** double filterSize,
//** bool wrap,
//** double (*FilterProc)(double),
//** FilterWeights contrib[] )
//** Returns: void
//** Description:
//**--------------------------------------------------------------------------
void CalcContributions( int srcSize, int destSize, double filterSize, bool wrap, double (*FilterProc)(double), FilterWeights contrib[] )
{
double scale;
double filterScale;
double center;
double totalWeight;
double weight;
int iRight;
int iLeft;
int iDest;
scale = (double)destSize / srcSize;
if ( scale < 1.0 )
{
filterSize = filterSize / scale;
filterScale = scale;
}
else
{
filterScale = 1.0;
}
if ( filterSize > (double)MaxFilterSize )
{
filterSize = (double)MaxFilterSize;
}
for ( iDest = 0; iDest < destSize; ++iDest )
{
center = (double)iDest / scale;
iLeft = (int)ceil(center - filterSize);
iRight = (int)floor(center + filterSize);
if ( !wrap )
{
if ( iLeft < 0 )
{
iLeft = 0;
}
if ( iRight >= srcSize )
{
iRight = srcSize - 1;
}
}
int numWeights = iRight - iLeft + 1;
contrib[iDest].first = iLeft;
contrib[iDest].numWeights = numWeights;
totalWeight = 0;
double t = ((double)iLeft - center) * filterScale;
for (int i = 0; i < numWeights; i++)
{
weight = (*FilterProc)(t) * filterScale;
totalWeight += weight;
contrib[iDest].weight[i] = weight;
t += filterScale;
}
//**--------------------------------------------------------
//** Normalize weights by dividing by the sum of the weights
//**--------------------------------------------------------
if ( totalWeight > 0.0 )
{
for ( int i = 0; i < numWeights; i++)
{
contrib[iDest].weight[i] /= totalWeight;
}
}
}
}
//**-------------------------------------------------------------------------
//** Name: Filter_TwoPass( RGBCOLOR *pSrcImage,
//** int srcWidth, int srcHeight,
//** RGBCOLOR *pDestImage,
//** int destWidth, int destHeight,
//** double (*FilterProc)(double) )
//** Returns: 0 on failure and 1 on success
//** Description: Filters a 2d image with a two pass filter by averaging the
//** weighted contributions of the pixels within the filter region. The
//** contributions are determined by a weighting function parameter.
//**-------------------------------------------------------------------------
int FilterTwoPass( RGBCOLOR *pSrcImage, int srcWidth, int srcHeight,
RGBCOLOR *pDestImage, int destWidth, int destHeight, unsigned int wrapFlags, double (*FilterProc)(double) )
{
FilterWeights *contrib;
RGBCOLOR *pPixel;
RGBCOLOR *pSrcPixel;
RGBCOLOR *pTempImage;
int iRow;
int iCol;
int iSrcCol;
int iSrcRow;
int iWeight;
double dRed;
double dGreen;
double dBlue;
double dAlpha;
double filterSize = 3.0;
int maxDim = (srcWidth>srcHeight)?srcWidth:srcHeight;
contrib = (FilterWeights*)malloc(maxDim * sizeof(FilterWeights));
//**------------------------------------------------------------------------
//** Need to create a temporary image to stuff the horizontally scaled image
//**------------------------------------------------------------------------
pTempImage = (RGBCOLOR *)malloc( destWidth * srcHeight * sizeof(RGBCOLOR) );
if ( pTempImage == NULL )
{
return 0;
}
//**-------------------------------------------------------
//** Horizontally filter the image into the temporary image
//**-------------------------------------------------------
bool bWrapHorizontal = !!(wrapFlags&FILTER_WRAP_X);
CalcContributions( srcWidth, destWidth, filterSize, bWrapHorizontal, FilterProc, contrib );
for ( iRow = 0; iRow < srcHeight; iRow++ )
{
for ( iCol = 0; iCol < destWidth; iCol++ )
{
dRed = 0;
dGreen = 0;
dBlue = 0;
dAlpha = 0;
for ( iWeight = 0; iWeight < contrib[iCol].numWeights; iWeight++ )
{
iSrcCol = iWeight + contrib[iCol].first;
if (bWrapHorizontal)
{
iSrcCol = (iSrcCol < 0) ? (srcWidth + iSrcCol) : (iSrcCol >= srcWidth) ? (iSrcCol - srcWidth) : iSrcCol;
}
pSrcPixel = pSrcImage + (iRow * srcWidth) + iSrcCol;
dRed += contrib[iCol].weight[iWeight] * pSrcPixel->rgba[0];
dGreen += contrib[iCol].weight[iWeight] * pSrcPixel->rgba[1];
dBlue += contrib[iCol].weight[iWeight] * pSrcPixel->rgba[2];
dAlpha += contrib[iCol].weight[iWeight] * pSrcPixel->rgba[3];
}
pPixel = pTempImage + (iRow * destWidth) + iCol;
pPixel->rgba[0] = static_cast<unsigned char>(std::max(0.0, std::min(255.0, dRed)));
pPixel->rgba[1] = static_cast<unsigned char>(std::max(0.0, std::min(255.0, dGreen)));
pPixel->rgba[2] = static_cast<unsigned char>(std::max(0.0, std::min(255.0, dBlue)));
pPixel->rgba[3] = static_cast<unsigned char>(std::max(0.0, std::min(255.0, dAlpha)));
}
}
//**-------------------------------------------------------
//** Vertically filter the image into the destination image
//**-------------------------------------------------------
bool bWrapVertical = !!(wrapFlags&FILTER_WRAP_Y);
CalcContributions(srcHeight, destHeight, filterSize, bWrapVertical, FilterProc, contrib);
for ( iCol = 0; iCol < destWidth; iCol++ )
{
for ( iRow = 0; iRow < destHeight; iRow++ )
{
dRed = 0;
dGreen = 0;
dBlue = 0;
dAlpha = 0;
for ( iWeight = 0; iWeight < contrib[iRow].numWeights; iWeight++ )
{
iSrcRow = iWeight + contrib[iRow].first;
if (bWrapVertical)
{
iSrcRow = (iSrcRow < 0) ? (srcHeight + iSrcRow) : (iSrcRow >= srcHeight) ? (iSrcRow - srcHeight) : iSrcRow;
}
pSrcPixel = pTempImage + (iSrcRow * destWidth) + iCol;
dRed += contrib[iRow].weight[iWeight] * pSrcPixel->rgba[0];
dGreen += contrib[iRow].weight[iWeight] * pSrcPixel->rgba[1];
dBlue += contrib[iRow].weight[iWeight] * pSrcPixel->rgba[2];
dAlpha += contrib[iRow].weight[iWeight] * pSrcPixel->rgba[3];
}
pPixel = pDestImage + (iRow * destWidth) + iCol;
pPixel->rgba[0] = (unsigned char)(std::max( 0.0, std::min( 255.0, dRed)));
pPixel->rgba[1] = (unsigned char)(std::max( 0.0, std::min( 255.0, dGreen)));
pPixel->rgba[2] = (unsigned char)(std::max( 0.0, std::min( 255.0, dBlue)));
pPixel->rgba[3] = (unsigned char)(std::max( 0.0, std::min( 255.0, dAlpha)));
}
}
free( pTempImage );
free( contrib );
return 1;
}
//**-------------------------------------------------------------------------
//** Name: FilterResample(RGBCOLOR *pSrcImage, int srcWidth, int srcHeight,
//** RGBCOLOR *pDstImage, int dstWidth, int dstHeight)
//** Returns: 1
//** Description: This function runs a 2d box filter over the srouce image
//** to produce the destination image.
//**-------------------------------------------------------------------------
void FilterResample( RGBCOLOR *pSrcImage, int srcWidth, int srcHeight,
RGBCOLOR *pDstImage, int dstWidth, int dstHeight )
{
int iRow;
int iCol;
int iSampleRow;
int iSampleCol;
int iFirstSampleRow;
int iFirstSampleCol;
int iLastSampleRow;
int iLastSampleCol;
int red;
int green;
int blue;
int alpha;
int samples;
float xScale;
float yScale;
RGBCOLOR *pSrcPixel;
RGBCOLOR *pDstPixel;
xScale = (float)srcWidth / dstWidth;
yScale = (float)srcHeight / dstHeight;
for ( iRow = 0; iRow < dstHeight; iRow++ )
{
for ( iCol = 0; iCol < dstWidth; iCol++ )
{
iFirstSampleRow = (int)(iRow * yScale);
iLastSampleRow = (int)ceil(iFirstSampleRow + yScale - 1);
if ( iLastSampleRow >= srcHeight )
{
iLastSampleRow = srcHeight - 1;
}
iFirstSampleCol = (int)(iCol * xScale);
iLastSampleCol = (int)ceil(iFirstSampleCol + xScale - 1);
if ( iLastSampleCol >= srcWidth )
{
iLastSampleCol = srcWidth - 1;
}
samples = 0;
red = 0;
green = 0;
blue = 0;
alpha = 0;
for ( iSampleRow = iFirstSampleRow; iSampleRow <= iLastSampleRow; iSampleRow++ )
{
for ( iSampleCol = iFirstSampleCol; iSampleCol <= iLastSampleCol; iSampleCol++ )
{
pSrcPixel = pSrcImage + iSampleRow * srcWidth + iSampleCol;
red += pSrcPixel->rgba[0];
green += pSrcPixel->rgba[1];
blue += pSrcPixel->rgba[2];
alpha += pSrcPixel->rgba[3];
samples++;
}
}
pDstPixel = pDstImage + iRow * dstWidth + iCol;
if ( samples > 0 )
{
pDstPixel->rgba[0] = static_cast<uint8_t>(red / samples);
pDstPixel->rgba[1] = static_cast<uint8_t>(green / samples);
pDstPixel->rgba[2] = static_cast<uint8_t>(blue / samples);
pDstPixel->rgba[3] = static_cast<uint8_t>(alpha / samples);
}
else
{
pDstPixel->rgba[0] = static_cast<uint8_t>(red);
pDstPixel->rgba[1] = static_cast<uint8_t>(green);
pDstPixel->rgba[2] = static_cast<uint8_t>(blue);
pDstPixel->rgba[3] = static_cast<uint8_t>(alpha);
}
}
}
}
}

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#pragma once
#include <stdint.h>
#include <algorithm>
namespace Etc
{
enum FilterEnums
{
MaxFilterSize = 32
};
enum WrapFlags
{
FILTER_WRAP_NONE = 0,
FILTER_WRAP_X = 0x1,
FILTER_WRAP_Y = 0x2
};
typedef struct tagFilterWeights
{
int first;
int numWeights;
double weight[MaxFilterSize * 2 + 1];
} FilterWeights;
typedef struct tagRGBCOLOR
{
union
{
uint32_t ulColor;
uint8_t rgba[4];
};
} RGBCOLOR;
double FilterBox( double t );
double FilterLinear( double t );
double FilterLanczos3( double t );
int FilterTwoPass( RGBCOLOR *pSrcImage, int srcWidth, int srcHeight,
RGBCOLOR *pDestImage, int destWidth, int destHeight, unsigned int wrapFlags, double (*FilterProc)(double) );
void FilterResample( RGBCOLOR *pSrcImage, int srcWidth, int srcHeight,
RGBCOLOR *pDstImage, int dstWidth, int dstHeight );
void CalcContributions(int srcSize, int destSize, double filterSize, bool wrap, double(*FilterProc)(double), FilterWeights contrib[]);
template <typename T>
void FilterResample(T *pSrcImage, int srcWidth, int srcHeight, T *pDstImage, int dstWidth, int dstHeight)
{
float xScale;
float yScale;
T *pSrcPixel;
T *pDstPixel;
xScale = (float)srcWidth / dstWidth;
yScale = (float)srcHeight / dstHeight;
for (int iRow = 0; iRow < dstHeight; iRow++)
{
for (int iCol = 0; iCol < dstWidth; iCol++)
{
int samples;
int iFirstSampleRow;
int iFirstSampleCol;
int iLastSampleRow;
int iLastSampleCol;
float red;
float green;
float blue;
float alpha;
iFirstSampleRow = (int)(iRow * yScale);
iLastSampleRow = (int)ceil(iFirstSampleRow + yScale - 1);
if (iLastSampleRow >= srcHeight)
{
iLastSampleRow = srcHeight - 1;
}
iFirstSampleCol = (int)(iCol * xScale);
iLastSampleCol = (int)ceil(iFirstSampleCol + xScale - 1);
if (iLastSampleCol >= srcWidth)
{
iLastSampleCol = srcWidth - 1;
}
samples = 0;
red = 0.f;
green = 0.f;
blue = 0.f;
alpha = 0.f;
for (int iSampleRow = iFirstSampleRow; iSampleRow <= iLastSampleRow; iSampleRow++)
{
for (int iSampleCol = iFirstSampleCol; iSampleCol <= iLastSampleCol; iSampleCol++)
{
pSrcPixel = pSrcImage + (iSampleRow * srcWidth + iSampleCol) * 4;
red += static_cast<float>(pSrcPixel[0]);
green += static_cast<float>(pSrcPixel[1]);
blue += static_cast<float>(pSrcPixel[2]);
alpha += static_cast<float>(pSrcPixel[3]);
samples++;
}
}
pDstPixel = pDstImage + (iRow * dstWidth + iCol) * 4;
if (samples > 0)
{
pDstPixel[0] = static_cast<T>(red / samples);
pDstPixel[1] = static_cast<T>(green / samples);
pDstPixel[2] = static_cast<T>(blue / samples);
pDstPixel[3] = static_cast<T>(alpha / samples);
}
else
{
pDstPixel[0] = static_cast<T>(red);
pDstPixel[1] = static_cast<T>(green);
pDstPixel[2] = static_cast<T>(blue);
pDstPixel[3] = static_cast<T>(alpha);
}
}
}
}
//**-------------------------------------------------------------------------
//** Name: Filter_TwoPass( RGBCOLOR *pSrcImage,
//** int srcWidth, int srcHeight,
//** RGBCOLOR *pDestImage,
//** int destWidth, int destHeight,
//** double (*FilterProc)(double) )
//** Returns: 0 on failure and 1 on success
//** Description: Filters a 2d image with a two pass filter by averaging the
//** weighted contributions of the pixels within the filter region. The
//** contributions are determined by a weighting function parameter.
//**-------------------------------------------------------------------------
template <typename T>
int FilterTwoPass(T *pSrcImage, int srcWidth, int srcHeight,
T *pDestImage, int destWidth, int destHeight, unsigned int wrapFlags, double(*FilterProc)(double))
{
const int numComponents = 4;
FilterWeights *contrib;
T *pPixel;
T *pTempImage;
double dRed;
double dGreen;
double dBlue;
double dAlpha;
double filterSize = 3.0;
int maxDim = (srcWidth>srcHeight) ? srcWidth : srcHeight;
contrib = new FilterWeights[maxDim];
//**------------------------------------------------------------------------
//** Need to create a temporary image to stuff the horizontally scaled image
//**------------------------------------------------------------------------
pTempImage = new T[destWidth * srcHeight * numComponents];
if (pTempImage == NULL)
{
return 0;
}
//**-------------------------------------------------------
//** Horizontally filter the image into the temporary image
//**-------------------------------------------------------
bool bWrapHorizontal = !!(wrapFlags&FILTER_WRAP_X);
CalcContributions(srcWidth, destWidth, filterSize, bWrapHorizontal, FilterProc, contrib);
for (int iRow = 0; iRow < srcHeight; iRow++)
{
for (int iCol = 0; iCol < destWidth; iCol++)
{
dRed = 0;
dGreen = 0;
dBlue = 0;
dAlpha = 0;
for (int iWeight = 0; iWeight < contrib[iCol].numWeights; iWeight++)
{
int iSrcCol = iWeight + contrib[iCol].first;
if(bWrapHorizontal)
{
iSrcCol = (iSrcCol < 0)?(srcWidth+iSrcCol):(iSrcCol >= srcWidth)?(iSrcCol-srcWidth):iSrcCol;
}
T* pSrcPixel = pSrcImage + ((iRow * srcWidth) + iSrcCol)*numComponents;
dRed += contrib[iCol].weight[iWeight] * pSrcPixel[0];
dGreen += contrib[iCol].weight[iWeight] * pSrcPixel[1];
dBlue += contrib[iCol].weight[iWeight] * pSrcPixel[2];
dAlpha += contrib[iCol].weight[iWeight] * pSrcPixel[3];
}
pPixel = pTempImage + ((iRow * destWidth) + iCol)*numComponents;
pPixel[0] = static_cast<T>(std::max(0.0, std::min(255.0, dRed)));
pPixel[1] = static_cast<T>(std::max(0.0, std::min(255.0, dGreen)));
pPixel[2] = static_cast<T>(std::max(0.0, std::min(255.0, dBlue)));
pPixel[3] = static_cast<T>(std::max(0.0, std::min(255.0, dAlpha)));
}
}
//**-------------------------------------------------------
//** Vertically filter the image into the destination image
//**-------------------------------------------------------
bool bWrapVertical = !!(wrapFlags&FILTER_WRAP_Y);
CalcContributions(srcHeight, destHeight, filterSize, bWrapVertical, FilterProc, contrib);
for (int iCol = 0; iCol < destWidth; iCol++)
{
for (int iRow = 0; iRow < destHeight; iRow++)
{
dRed = 0;
dGreen = 0;
dBlue = 0;
dAlpha = 0;
for (int iWeight = 0; iWeight < contrib[iRow].numWeights; iWeight++)
{
int iSrcRow = iWeight + contrib[iRow].first;
if (bWrapVertical)
{
iSrcRow = (iSrcRow < 0) ? (srcHeight + iSrcRow) : (iSrcRow >= srcHeight) ? (iSrcRow - srcHeight) : iSrcRow;
}
T* pSrcPixel = pTempImage + ((iSrcRow * destWidth) + iCol)*numComponents;
dRed += contrib[iRow].weight[iWeight] * pSrcPixel[0];
dGreen += contrib[iRow].weight[iWeight] * pSrcPixel[1];
dBlue += contrib[iRow].weight[iWeight] * pSrcPixel[2];
dAlpha += contrib[iRow].weight[iWeight] * pSrcPixel[3];
}
pPixel = pDestImage + ((iRow * destWidth) + iCol)*numComponents;
pPixel[0] = static_cast<T>(std::max(0.0, std::min(255.0, dRed)));
pPixel[1] = static_cast<T>(std::max(0.0, std::min(255.0, dGreen)));
pPixel[2] = static_cast<T>(std::max(0.0, std::min(255.0, dBlue)));
pPixel[3] = static_cast<T>(std::max(0.0, std::min(255.0, dAlpha)));
}
}
delete[] pTempImage;
delete[] contrib;
return 1;
}
}

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
EtcImage.cpp
Image is an array of 4x4 blocks that represent the encoding of the source image
*/
#include "EtcConfig.h"
#include <stdlib.h>
#include "EtcImage.h"
#include "Etc.h"
#include "EtcBlock4x4.h"
#include "EtcBlock4x4EncodingBits.h"
#include "EtcSortedBlockList.h"
#if ETC_WINDOWS
#include <windows.h>
#endif
#include <ctime>
#include <chrono>
#include <future>
#include <stdio.h>
#include <string.h>
#include <assert.h>
// fix conflict with Block4x4::AlphaMix
#ifdef OPAQUE
#undef OPAQUE
#endif
#ifdef TRANSPARENT
#undef TRANSPARENT
#endif
namespace Etc
{
// ----------------------------------------------------------------------------------------------------
//
Image::Image(void)
{
m_encodingStatus = EncodingStatus::SUCCESS;
m_warningsToCapture = EncodingStatus::SUCCESS;
m_pafrgbaSource = nullptr;
m_pablock = nullptr;
m_encodingbitsformat = Block4x4EncodingBits::Format::UNKNOWN;
m_uiEncodingBitsBytes = 0;
m_paucEncodingBits = nullptr;
m_format = Format::UNKNOWN;
m_iNumOpaquePixels = 0;
m_iNumTranslucentPixels = 0;
m_iNumTransparentPixels = 0;
}
// ----------------------------------------------------------------------------------------------------
// constructor using source image
// used to set state before Encode() is called
//
Image::Image(float *a_pafSourceRGBA, unsigned int a_uiSourceWidth,
unsigned int a_uiSourceHeight,
ErrorMetric a_errormetric)
{
m_encodingStatus = EncodingStatus::SUCCESS;
m_warningsToCapture = EncodingStatus::SUCCESS;
m_pafrgbaSource = (ColorFloatRGBA *) a_pafSourceRGBA;
m_uiSourceWidth = a_uiSourceWidth;
m_uiSourceHeight = a_uiSourceHeight;
m_uiExtendedWidth = CalcExtendedDimension((unsigned short)m_uiSourceWidth);
m_uiExtendedHeight = CalcExtendedDimension((unsigned short)m_uiSourceHeight);
m_uiBlockColumns = m_uiExtendedWidth >> 2;
m_uiBlockRows = m_uiExtendedHeight >> 2;
m_pablock = new Block4x4[GetNumberOfBlocks()];
assert(m_pablock);
m_format = Format::UNKNOWN;
m_encodingbitsformat = Block4x4EncodingBits::Format::UNKNOWN;
m_uiEncodingBitsBytes = 0;
m_paucEncodingBits = nullptr;
m_errormetric = a_errormetric;
m_fEffort = 0.0f;
m_iEncodeTime_ms = -1;
m_iNumOpaquePixels = 0;
m_iNumTranslucentPixels = 0;
m_iNumTransparentPixels = 0;
m_bVerboseOutput = false;
}
// ----------------------------------------------------------------------------------------------------
// constructor using encoding bits
// recreates encoding state using a previously encoded image
//
Image::Image(Format a_format,
unsigned int a_uiSourceWidth, unsigned int a_uiSourceHeight,
unsigned char *a_paucEncidingBits, unsigned int a_uiEncodingBitsBytes,
Image *a_pimageSource, ErrorMetric a_errormetric)
{
m_encodingStatus = EncodingStatus::SUCCESS;
m_pafrgbaSource = nullptr;
m_uiSourceWidth = a_uiSourceWidth;
m_uiSourceHeight = a_uiSourceHeight;
m_uiExtendedWidth = CalcExtendedDimension((unsigned short)m_uiSourceWidth);
m_uiExtendedHeight = CalcExtendedDimension((unsigned short)m_uiSourceHeight);
m_uiBlockColumns = m_uiExtendedWidth >> 2;
m_uiBlockRows = m_uiExtendedHeight >> 2;
unsigned int uiBlocks = GetNumberOfBlocks();
m_pablock = new Block4x4[uiBlocks];
assert(m_pablock);
m_format = a_format;
m_iNumOpaquePixels = 0;
m_iNumTranslucentPixels = 0;
m_iNumTransparentPixels = 0;
m_encodingbitsformat = DetermineEncodingBitsFormat(m_format);
if (m_encodingbitsformat == Block4x4EncodingBits::Format::UNKNOWN)
{
AddToEncodingStatus(ERROR_UNKNOWN_FORMAT);
return;
}
m_uiEncodingBitsBytes = a_uiEncodingBitsBytes;
m_paucEncodingBits = a_paucEncidingBits;
m_errormetric = a_errormetric;
m_fEffort = 0.0f;
m_bVerboseOutput = false;
m_iEncodeTime_ms = -1;
unsigned char *paucEncodingBits = m_paucEncodingBits;
unsigned int uiEncodingBitsBytesPerBlock = Block4x4EncodingBits::GetBytesPerBlock(m_encodingbitsformat);
unsigned int uiH = 0;
unsigned int uiV = 0;
for (unsigned int uiBlock = 0; uiBlock < uiBlocks; uiBlock++)
{
m_pablock[uiBlock].InitFromEtcEncodingBits(a_format, uiH, uiV, paucEncodingBits,
a_pimageSource, a_errormetric);
paucEncodingBits += uiEncodingBitsBytesPerBlock;
uiH += 4;
if (uiH >= m_uiSourceWidth)
{
uiH = 0;
uiV += 4;
}
}
}
// ----------------------------------------------------------------------------------------------------
//
Image::~Image(void)
{
if (m_pablock != nullptr)
{
delete[] m_pablock;
m_pablock = nullptr;
}
/*if (m_paucEncodingBits != nullptr)
{
delete[] m_paucEncodingBits;
m_paucEncodingBits = nullptr;
}*/
}
// ----------------------------------------------------------------------------------------------------
// encode an image
// create a set of encoding bits that conforms to a_format
// find best fit using a_errormetric
// explore a range of possible encodings based on a_fEffort (range = [0:100])
// speed up process using a_uiJobs as the number of process threads (a_uiJobs must not excede a_uiMaxJobs)
//
Image::EncodingStatus Image::Encode(Format a_format, ErrorMetric a_errormetric, float a_fEffort, unsigned int a_uiJobs, unsigned int a_uiMaxJobs)
{
auto start = std::chrono::steady_clock::now();
m_encodingStatus = EncodingStatus::SUCCESS;
m_format = a_format;
m_errormetric = a_errormetric;
m_fEffort = a_fEffort;
if (m_errormetric < 0 || m_errormetric > ERROR_METRICS)
{
AddToEncodingStatus(ERROR_UNKNOWN_ERROR_METRIC);
return m_encodingStatus;
}
if (m_fEffort < ETCCOMP_MIN_EFFORT_LEVEL)
{
AddToEncodingStatus(WARNING_EFFORT_OUT_OF_RANGE);
m_fEffort = ETCCOMP_MIN_EFFORT_LEVEL;
}
else if (m_fEffort > ETCCOMP_MAX_EFFORT_LEVEL)
{
AddToEncodingStatus(WARNING_EFFORT_OUT_OF_RANGE);
m_fEffort = ETCCOMP_MAX_EFFORT_LEVEL;
}
if (a_uiJobs < 1)
{
a_uiJobs = 1;
AddToEncodingStatus(WARNING_JOBS_OUT_OF_RANGE);
}
else if (a_uiJobs > a_uiMaxJobs)
{
a_uiJobs = a_uiMaxJobs;
AddToEncodingStatus(WARNING_JOBS_OUT_OF_RANGE);
}
m_encodingbitsformat = DetermineEncodingBitsFormat(m_format);
if (m_encodingbitsformat == Block4x4EncodingBits::Format::UNKNOWN)
{
AddToEncodingStatus(ERROR_UNKNOWN_FORMAT);
return m_encodingStatus;
}
assert(m_paucEncodingBits == nullptr);
m_uiEncodingBitsBytes = GetNumberOfBlocks() * Block4x4EncodingBits::GetBytesPerBlock(m_encodingbitsformat);
m_paucEncodingBits = new unsigned char[m_uiEncodingBitsBytes];
InitBlocksAndBlockSorter();
std::future<void> *handle = new std::future<void>[a_uiMaxJobs];
unsigned int uiNumThreadsNeeded = 0;
unsigned int uiUnfinishedBlocks = GetNumberOfBlocks();
uiNumThreadsNeeded = (uiUnfinishedBlocks < a_uiJobs) ? uiUnfinishedBlocks : a_uiJobs;
for (int i = 0; i < (int)uiNumThreadsNeeded - 1; i++)
{
handle[i] = async(std::launch::async, &Image::RunFirstPass, this, i, uiNumThreadsNeeded);
}
RunFirstPass(uiNumThreadsNeeded - 1, uiNumThreadsNeeded);
for (int i = 0; i < (int)uiNumThreadsNeeded - 1; i++)
{
handle[i].get();
}
// perform effort-based encoding
if (m_fEffort > ETCCOMP_MIN_EFFORT_LEVEL)
{
unsigned int uiFinishedBlocks = 0;
unsigned int uiTotalEffortBlocks = static_cast<unsigned int>(roundf(0.01f * m_fEffort * GetNumberOfBlocks()));
if (m_bVerboseOutput)
{
printf("effortblocks = %d\n", uiTotalEffortBlocks);
}
unsigned int uiPass = 0;
while (1)
{
if (m_bVerboseOutput)
{
uiPass++;
printf("pass %u\n", uiPass);
}
m_psortedblocklist->Sort();
uiUnfinishedBlocks = m_psortedblocklist->GetNumberOfSortedBlocks();
uiFinishedBlocks = GetNumberOfBlocks() - uiUnfinishedBlocks;
if (m_bVerboseOutput)
{
printf(" %u unfinished blocks\n", uiUnfinishedBlocks);
// m_psortedblocklist->Print();
}
//stop enocding when we did enough to satify the effort percentage
if (uiFinishedBlocks >= uiTotalEffortBlocks)
{
if (m_bVerboseOutput)
{
printf("Finished %d Blocks out of %d\n", uiFinishedBlocks, uiTotalEffortBlocks);
}
break;
}
unsigned int uiIteratedBlocks = 0;
unsigned int blocksToIterateThisPass = (uiTotalEffortBlocks - uiFinishedBlocks);
uiNumThreadsNeeded = (uiUnfinishedBlocks < a_uiJobs) ? uiUnfinishedBlocks : a_uiJobs;
if (uiNumThreadsNeeded <= 1)
{
//since we already how many blocks each thread will process
//cap the thread limit to do the proper amount of work, and not more
uiIteratedBlocks = IterateThroughWorstBlocks(blocksToIterateThisPass, 0, 1);
}
else
{
//we have a lot of work to do, so lets multi thread it
std::future<unsigned int> *handleToBlockEncoders = new std::future<unsigned int>[uiNumThreadsNeeded-1];
for (int i = 0; i < (int)uiNumThreadsNeeded - 1; i++)
{
handleToBlockEncoders[i] = async(std::launch::async, &Image::IterateThroughWorstBlocks, this, blocksToIterateThisPass, i, uiNumThreadsNeeded);
}
uiIteratedBlocks = IterateThroughWorstBlocks(blocksToIterateThisPass, uiNumThreadsNeeded - 1, uiNumThreadsNeeded);
for (int i = 0; i < (int)uiNumThreadsNeeded - 1; i++)
{
uiIteratedBlocks += handleToBlockEncoders[i].get();
}
delete[] handleToBlockEncoders;
}
if (m_bVerboseOutput)
{
printf(" %u iterated blocks\n", uiIteratedBlocks);
}
}
}
// generate Etc2-compatible bit-format 4x4 blocks
for (int i = 0; i < (int)a_uiJobs - 1; i++)
{
handle[i] = async(std::launch::async, &Image::SetEncodingBits, this, i, a_uiJobs);
}
SetEncodingBits(a_uiJobs - 1, a_uiJobs);
for (int i = 0; i < (int)a_uiJobs - 1; i++)
{
handle[i].get();
}
auto end = std::chrono::steady_clock::now();
std::chrono::milliseconds elapsed = std::chrono::duration_cast<std::chrono::milliseconds>(end - start);
m_iEncodeTime_ms = (int)elapsed.count();
delete[] handle;
delete m_psortedblocklist;
return m_encodingStatus;
}
// ----------------------------------------------------------------------------------------------------
// iterate the encoding thru the blocks with the worst error
// stop when a_uiMaxBlocks blocks have been iterated
// split the blocks between the process threads using a_uiMultithreadingOffset and a_uiMultithreadingStride
//
unsigned int Image::IterateThroughWorstBlocks(unsigned int a_uiMaxBlocks,
unsigned int a_uiMultithreadingOffset,
unsigned int a_uiMultithreadingStride)
{
assert(a_uiMultithreadingStride > 0);
unsigned int uiIteratedBlocks = a_uiMultithreadingOffset;
SortedBlockList::Link *plink = m_psortedblocklist->GetLinkToFirstBlock();
for (plink = plink->Advance(a_uiMultithreadingOffset);
plink != nullptr;
plink = plink->Advance(a_uiMultithreadingStride) )
{
if (uiIteratedBlocks >= a_uiMaxBlocks)
{
break;
}
plink->GetBlock()->PerformEncodingIteration(m_fEffort);
uiIteratedBlocks += a_uiMultithreadingStride;
}
return uiIteratedBlocks;
}
// ----------------------------------------------------------------------------------------------------
// determine which warnings to check for during Encode() based on encoding format
//
void Image::FindEncodingWarningTypesForCurFormat()
{
TrackEncodingWarning(WARNING_ALL_TRANSPARENT_PIXELS);
TrackEncodingWarning(WARNING_SOME_RGBA_NOT_0_TO_1);
switch (m_format)
{
case Image::Format::ETC1:
case Image::Format::RGB8:
case Image::Format::SRGB8:
TrackEncodingWarning(WARNING_SOME_NON_OPAQUE_PIXELS);
TrackEncodingWarning(WARNING_SOME_TRANSLUCENT_PIXELS);
break;
case Image::Format::RGB8A1:
case Image::Format::SRGB8A1:
TrackEncodingWarning(WARNING_SOME_TRANSLUCENT_PIXELS);
TrackEncodingWarning(WARNING_ALL_OPAQUE_PIXELS);
break;
case Image::Format::RGBA8:
case Image::Format::SRGBA8:
TrackEncodingWarning(WARNING_ALL_OPAQUE_PIXELS);
break;
case Image::Format::R11:
case Image::Format::SIGNED_R11:
TrackEncodingWarning(WARNING_SOME_NON_OPAQUE_PIXELS);
TrackEncodingWarning(WARNING_SOME_TRANSLUCENT_PIXELS);
TrackEncodingWarning(WARNING_SOME_GREEN_VALUES_ARE_NOT_ZERO);
TrackEncodingWarning(WARNING_SOME_BLUE_VALUES_ARE_NOT_ZERO);
break;
case Image::Format::RG11:
case Image::Format::SIGNED_RG11:
TrackEncodingWarning(WARNING_SOME_NON_OPAQUE_PIXELS);
TrackEncodingWarning(WARNING_SOME_TRANSLUCENT_PIXELS);
TrackEncodingWarning(WARNING_SOME_BLUE_VALUES_ARE_NOT_ZERO);
break;
case Image::Format::FORMATS:
case Image::Format::UNKNOWN:
default:
assert(0);
break;
}
}
// ----------------------------------------------------------------------------------------------------
// examine source pixels to check for warnings
//
void Image::FindAndSetEncodingWarnings()
{
int numPixels = (m_uiBlockRows * 4) * (m_uiBlockColumns * 4);
if (m_iNumOpaquePixels == numPixels)
{
AddToEncodingStatusIfSignfigant(Image::EncodingStatus::WARNING_ALL_OPAQUE_PIXELS);
}
if (m_iNumOpaquePixels < numPixels)
{
AddToEncodingStatusIfSignfigant(Image::EncodingStatus::WARNING_SOME_NON_OPAQUE_PIXELS);
}
if (m_iNumTranslucentPixels > 0)
{
AddToEncodingStatusIfSignfigant(Image::EncodingStatus::WARNING_SOME_TRANSLUCENT_PIXELS);
}
if (m_iNumTransparentPixels == numPixels)
{
AddToEncodingStatusIfSignfigant(Image::EncodingStatus::WARNING_ALL_TRANSPARENT_PIXELS);
}
if (m_numColorValues.fB > 0.0f)
{
AddToEncodingStatusIfSignfigant(Image::EncodingStatus::WARNING_SOME_BLUE_VALUES_ARE_NOT_ZERO);
}
if (m_numColorValues.fG > 0.0f)
{
AddToEncodingStatusIfSignfigant(Image::EncodingStatus::WARNING_SOME_GREEN_VALUES_ARE_NOT_ZERO);
}
if (m_numOutOfRangeValues.fR > 0.0f || m_numOutOfRangeValues.fG > 0.0f)
{
AddToEncodingStatusIfSignfigant(Image::EncodingStatus::WARNING_SOME_RGBA_NOT_0_TO_1);
}
if (m_numOutOfRangeValues.fB > 0.0f || m_numOutOfRangeValues.fA > 0.0f)
{
AddToEncodingStatusIfSignfigant(Image::EncodingStatus::WARNING_SOME_RGBA_NOT_0_TO_1);
}
}
// ----------------------------------------------------------------------------------------------------
// return a string name for a given image format
//
const char * Image::EncodingFormatToString(Image::Format a_format)
{
switch (a_format)
{
case Image::Format::ETC1:
return "ETC1";
case Image::Format::RGB8:
return "RGB8";
case Image::Format::SRGB8:
return "SRGB8";
case Image::Format::RGB8A1:
return "RGB8A1";
case Image::Format::SRGB8A1:
return "SRGB8A1";
case Image::Format::RGBA8:
return "RGBA8";
case Image::Format::SRGBA8:
return "SRGBA8";
case Image::Format::R11:
return "R11";
case Image::Format::SIGNED_R11:
return "SIGNED_R11";
case Image::Format::RG11:
return "RG11";
case Image::Format::SIGNED_RG11:
return "SIGNED_RG11";
case Image::Format::FORMATS:
case Image::Format::UNKNOWN:
default:
return "UNKNOWN";
}
}
// ----------------------------------------------------------------------------------------------------
// return a string name for the image's format
//
const char * Image::EncodingFormatToString(void)
{
return EncodingFormatToString(m_format);
}
// ----------------------------------------------------------------------------------------------------
// init image blocks prior to encoding
// init block sorter for subsequent sortings
// check for encoding warnings
//
void Image::InitBlocksAndBlockSorter(void)
{
FindEncodingWarningTypesForCurFormat();
// init each block
Block4x4 *pblock = m_pablock;
unsigned char *paucEncodingBits = m_paucEncodingBits;
for (unsigned int uiBlockRow = 0; uiBlockRow < m_uiBlockRows; uiBlockRow++)
{
unsigned int uiBlockV = uiBlockRow * 4;
for (unsigned int uiBlockColumn = 0; uiBlockColumn < m_uiBlockColumns; uiBlockColumn++)
{
unsigned int uiBlockH = uiBlockColumn * 4;
pblock->InitFromSource(this, uiBlockH, uiBlockV, paucEncodingBits, m_errormetric);
paucEncodingBits += Block4x4EncodingBits::GetBytesPerBlock(m_encodingbitsformat);
pblock++;
}
}
FindAndSetEncodingWarnings();
// init block sorter
{
m_psortedblocklist = new SortedBlockList(GetNumberOfBlocks(), 100);
for (unsigned int uiBlock = 0; uiBlock < GetNumberOfBlocks(); uiBlock++)
{
pblock = &m_pablock[uiBlock];
m_psortedblocklist->AddBlock(pblock);
}
}
}
// ----------------------------------------------------------------------------------------------------
// run the first pass of the encoder
// the encoder generally finds a reasonable, fast encoding
// this is run on all blocks regardless of effort to ensure that all blocks have a valid encoding
//
void Image::RunFirstPass(unsigned int a_uiMultithreadingOffset, unsigned int a_uiMultithreadingStride)
{
assert(a_uiMultithreadingStride > 0);
for (unsigned int uiBlock = a_uiMultithreadingOffset;
uiBlock < GetNumberOfBlocks();
uiBlock += a_uiMultithreadingStride)
{
Block4x4 *pblock = &m_pablock[uiBlock];
pblock->PerformEncodingIteration(m_fEffort);
}
}
// ----------------------------------------------------------------------------------------------------
// set the encoding bits (for the output file) based on the best encoding for each block
//
void Image::SetEncodingBits(unsigned int a_uiMultithreadingOffset,
unsigned int a_uiMultithreadingStride)
{
assert(a_uiMultithreadingStride > 0);
for (unsigned int uiBlock = a_uiMultithreadingOffset;
uiBlock < GetNumberOfBlocks();
uiBlock += a_uiMultithreadingStride)
{
Block4x4 *pblock = &m_pablock[uiBlock];
pblock->SetEncodingBitsFromEncoding();
}
}
// ----------------------------------------------------------------------------------------------------
// return the image error
// image error is the sum of all block errors
//
float Image::GetError(void)
{
float fError = 0.0f;
for (unsigned int uiBlock = 0; uiBlock < GetNumberOfBlocks(); uiBlock++)
{
Block4x4 *pblock = &m_pablock[uiBlock];
fError += pblock->GetError();
}
return fError;
}
// ----------------------------------------------------------------------------------------------------
// determine the encoding bits format based on the encoding format
// the encoding bits format is a family of bit encodings that are shared across various encoding formats
//
Block4x4EncodingBits::Format Image::DetermineEncodingBitsFormat(Format a_format)
{
Block4x4EncodingBits::Format encodingbitsformat;
// determine encoding bits format from image format
switch (a_format)
{
case Format::ETC1:
case Format::RGB8:
case Format::SRGB8:
encodingbitsformat = Block4x4EncodingBits::Format::RGB8;
break;
case Format::RGBA8:
case Format::SRGBA8:
encodingbitsformat = Block4x4EncodingBits::Format::RGBA8;
break;
case Format::R11:
case Format::SIGNED_R11:
encodingbitsformat = Block4x4EncodingBits::Format::R11;
break;
case Format::RG11:
case Format::SIGNED_RG11:
encodingbitsformat = Block4x4EncodingBits::Format::RG11;
break;
case Format::RGB8A1:
case Format::SRGB8A1:
encodingbitsformat = Block4x4EncodingBits::Format::RGB8A1;
break;
default:
encodingbitsformat = Block4x4EncodingBits::Format::UNKNOWN;
break;
}
return encodingbitsformat;
}
// ----------------------------------------------------------------------------------------------------
//
} // namespace Etc

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
//#include "Etc.h"
#include "EtcColorFloatRGBA.h"
#include "EtcBlock4x4EncodingBits.h"
#include "EtcErrorMetric.h"
namespace Etc
{
class Block4x4;
class EncoderSpec;
class SortedBlockList;
class Image
{
public:
//the differnt warning and errors that can come up during encoding
enum EncodingStatus
{
SUCCESS = 0,
//
WARNING_THRESHOLD = 1 << 0,
//
WARNING_EFFORT_OUT_OF_RANGE = 1 << 1,
WARNING_JOBS_OUT_OF_RANGE = 1 << 2,
WARNING_SOME_NON_OPAQUE_PIXELS = 1 << 3,//just for opaque formats, etc1, rgb8, r11, rg11
WARNING_ALL_OPAQUE_PIXELS = 1 << 4,
WARNING_ALL_TRANSPARENT_PIXELS = 1 << 5,
WARNING_SOME_TRANSLUCENT_PIXELS = 1 << 6,//just for rgb8A1
WARNING_SOME_RGBA_NOT_0_TO_1 = 1 << 7,
WARNING_SOME_BLUE_VALUES_ARE_NOT_ZERO = 1 << 8,
WARNING_SOME_GREEN_VALUES_ARE_NOT_ZERO = 1 << 9,
//
ERROR_THRESHOLD = 1 << 16,
//
ERROR_UNKNOWN_FORMAT = 1 << 17,
ERROR_UNKNOWN_ERROR_METRIC = 1 << 18,
ERROR_ZERO_WIDTH_OR_HEIGHT = 1 << 19,
//
};
enum class Format
{
UNKNOWN,
//
ETC1,
//
// ETC2 formats
RGB8,
SRGB8,
RGBA8,
SRGBA8,
R11,
SIGNED_R11,
RG11,
SIGNED_RG11,
RGB8A1,
SRGB8A1,
//
FORMATS,
//
DEFAULT = SRGB8
};
// constructor using source image
Image(float *a_pafSourceRGBA, unsigned int a_uiSourceWidth,
unsigned int a_uiSourceHeight,
ErrorMetric a_errormetric);
// constructor using encoding bits
Image(Format a_format,
unsigned int a_uiSourceWidth, unsigned int a_uiSourceHeight,
unsigned char *a_paucEncidingBits, unsigned int a_uiEncodingBitsBytes,
Image *a_pimageSource,
ErrorMetric a_errormetric);
~Image(void);
EncodingStatus Encode(Format a_format, ErrorMetric a_errormetric, float a_fEffort,
unsigned int a_uiJobs, unsigned int a_uiMaxJobs);
inline void AddToEncodingStatus(EncodingStatus a_encStatus)
{
m_encodingStatus = (EncodingStatus)((unsigned int)m_encodingStatus | (unsigned int)a_encStatus);
}
inline unsigned int GetSourceWidth(void)
{
return m_uiSourceWidth;
}
inline unsigned int GetSourceHeight(void)
{
return m_uiSourceHeight;
}
inline unsigned int GetExtendedWidth(void)
{
return m_uiExtendedWidth;
}
inline unsigned int GetExtendedHeight(void)
{
return m_uiExtendedHeight;
}
inline unsigned int GetNumberOfBlocks()
{
return m_uiBlockColumns * m_uiBlockRows;
}
inline Block4x4 * GetBlocks()
{
return m_pablock;
}
inline unsigned char * GetEncodingBits(void)
{
return m_paucEncodingBits;
}
inline unsigned int GetEncodingBitsBytes(void)
{
return m_uiEncodingBitsBytes;
}
inline int GetEncodingTimeMs(void)
{
return m_iEncodeTime_ms;
}
float GetError(void);
inline ColorFloatRGBA * GetSourcePixel(unsigned int a_uiH, unsigned int a_uiV)
{
if (a_uiH >= m_uiSourceWidth || a_uiV >= m_uiSourceHeight)
{
return nullptr;
}
return &m_pafrgbaSource[a_uiV*m_uiSourceWidth + a_uiH];
}
inline Format GetFormat(void)
{
return m_format;
}
static Block4x4EncodingBits::Format DetermineEncodingBitsFormat(Format a_format);
inline static unsigned short CalcExtendedDimension(unsigned short a_ushOriginalDimension)
{
return (unsigned short)((a_ushOriginalDimension + 3) & ~3);
}
inline ErrorMetric GetErrorMetric(void)
{
return m_errormetric;
}
static const char * EncodingFormatToString(Image::Format a_format);
const char * EncodingFormatToString(void);
//used to get basic information about the image data
int m_iNumOpaquePixels;
int m_iNumTranslucentPixels;
int m_iNumTransparentPixels;
ColorFloatRGBA m_numColorValues;
ColorFloatRGBA m_numOutOfRangeValues;
bool m_bVerboseOutput;
private:
//add a warning or error to check for while encoding
inline void TrackEncodingWarning(EncodingStatus a_encStatus)
{
m_warningsToCapture = (EncodingStatus)((unsigned int)m_warningsToCapture | (unsigned int)a_encStatus);
}
//report the warning if it is something we care about for this encoding
inline void AddToEncodingStatusIfSignfigant(EncodingStatus a_encStatus)
{
if ((EncodingStatus)((unsigned int)m_warningsToCapture & (unsigned int)a_encStatus) == a_encStatus)
{
AddToEncodingStatus(a_encStatus);
}
}
Image(void);
void FindEncodingWarningTypesForCurFormat();
void FindAndSetEncodingWarnings();
void InitBlocksAndBlockSorter(void);
void RunFirstPass(unsigned int a_uiMultithreadingOffset,
unsigned int a_uiMultithreadingStride);
void SetEncodingBits(unsigned int a_uiMultithreadingOffset,
unsigned int a_uiMultithreadingStride);
unsigned int IterateThroughWorstBlocks(unsigned int a_uiMaxBlocks,
unsigned int a_uiMultithreadingOffset,
unsigned int a_uiMultithreadingStride);
// inputs
ColorFloatRGBA *m_pafrgbaSource;
unsigned int m_uiSourceWidth;
unsigned int m_uiSourceHeight;
unsigned int m_uiExtendedWidth;
unsigned int m_uiExtendedHeight;
unsigned int m_uiBlockColumns;
unsigned int m_uiBlockRows;
// intermediate data
Block4x4 *m_pablock;
// encoding
Format m_format;
Block4x4EncodingBits::Format m_encodingbitsformat;
unsigned int m_uiEncodingBitsBytes; // for entire image
unsigned char *m_paucEncodingBits;
ErrorMetric m_errormetric;
float m_fEffort;
// stats
int m_iEncodeTime_ms;
SortedBlockList *m_psortedblocklist;
//this will hold any warning or errors that happen during encoding
EncodingStatus m_encodingStatus;
//these will be the warnings we are tracking
EncodingStatus m_warningsToCapture;
};
} // namespace Etc

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
EtcIndividualTrys.cpp
Gathers the results of the various encoding trys for both halves of a 4x4 block for Individual mode
*/
#include "EtcConfig.h"
#include "EtcIndividualTrys.h"
#include <assert.h>
namespace Etc
{
// ----------------------------------------------------------------------------------------------------
// construct a list of trys (encoding attempts)
//
// a_frgbaColor1 is the basecolor for the first half
// a_frgbaColor2 is the basecolor for the second half
// a_pauiPixelMapping1 is the pixel order for the first half
// a_pauiPixelMapping2 is the pixel order for the second half
// a_uiRadius is the amount to vary the base colors
//
IndividualTrys::IndividualTrys(ColorFloatRGBA a_frgbaColor1, ColorFloatRGBA a_frgbaColor2,
const unsigned int *a_pauiPixelMapping1,
const unsigned int *a_pauiPixelMapping2,
unsigned int a_uiRadius)
{
assert(a_uiRadius <= MAX_RADIUS);
ColorFloatRGBA frgbaQuantizedColor1 = a_frgbaColor1.QuantizeR4G4B4();
ColorFloatRGBA frgbaQuantizedColor2 = a_frgbaColor2.QuantizeR4G4B4();
// quantize base colors
// ensure that trys with a_uiRadius don't overflow
int iRed1 = MoveAwayFromEdge(frgbaQuantizedColor1.IntRed(15.0f), a_uiRadius);
int iGreen1 = MoveAwayFromEdge(frgbaQuantizedColor1.IntGreen(15.0f), a_uiRadius);
int iBlue1 = MoveAwayFromEdge(frgbaQuantizedColor1.IntBlue(15.0f), a_uiRadius);
int iRed2 = MoveAwayFromEdge(frgbaQuantizedColor2.IntRed(15.0f), a_uiRadius);
int iGreen2 = MoveAwayFromEdge(frgbaQuantizedColor2.IntGreen(15.0f), a_uiRadius);
int iBlue2 = MoveAwayFromEdge(frgbaQuantizedColor2.IntBlue(15.0f), a_uiRadius);
m_half1.Init(iRed1, iGreen1, iBlue1, a_pauiPixelMapping1, a_uiRadius);
m_half2.Init(iRed2, iGreen2, iBlue2, a_pauiPixelMapping2, a_uiRadius);
}
// ----------------------------------------------------------------------------------------------------
//
void IndividualTrys::Half::Init(int a_iRed, int a_iGreen, int a_iBlue,
const unsigned int *a_pauiPixelMapping, unsigned int a_uiRadius)
{
m_iRed = a_iRed;
m_iGreen = a_iGreen;
m_iBlue = a_iBlue;
m_pauiPixelMapping = a_pauiPixelMapping;
m_uiRadius = a_uiRadius;
m_uiTrys = 0;
}
// ----------------------------------------------------------------------------------------------------
//
} // namespace Etc

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include "EtcColorFloatRGBA.h"
namespace Etc
{
class IndividualTrys
{
public:
static const unsigned int MAX_RADIUS = 1;
IndividualTrys(ColorFloatRGBA a_frgbaColor1,
ColorFloatRGBA a_frgbaColor2,
const unsigned int *a_pauiPixelMapping1,
const unsigned int *a_pauiPixelMapping2,
unsigned int a_uiRadius);
inline static int MoveAwayFromEdge(int a_i, int a_iDistance)
{
if (a_i < (0+ a_iDistance))
{
return (0 + a_iDistance);
}
else if (a_i > (15- a_iDistance))
{
return (15 - a_iDistance);
}
return a_i;
}
class Try
{
public :
static const unsigned int SELECTORS = 8; // per half
int m_iRed;
int m_iGreen;
int m_iBlue;
unsigned int m_uiCW;
unsigned int m_auiSelectors[SELECTORS];
float m_fError;
};
class Half
{
public:
static const unsigned int MAX_TRYS = 27;
void Init(int a_iRed, int a_iGreen, int a_iBlue,
const unsigned int *a_pauiPixelMapping,
unsigned int a_uiRadius);
// center of trys
int m_iRed;
int m_iGreen;
int m_iBlue;
const unsigned int *m_pauiPixelMapping;
unsigned int m_uiRadius;
unsigned int m_uiTrys;
Try m_atry[MAX_TRYS];
Try *m_ptryBest;
};
Half m_half1;
Half m_half2;
};
// ----------------------------------------------------------------------------------------------------
//
} // namespace Etc

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "EtcConfig.h"
#include "EtcMath.h"
namespace Etc
{
// ----------------------------------------------------------------------------------------------------
// calculate the line that best fits the set of XY points contained in a_afX[] and a_afY[]
// use a_fSlope and a_fOffset to define that line
//
bool Regression(float a_afX[], float a_afY[], unsigned int a_Points,
float *a_fSlope, float *a_fOffset)
{
float fPoints = (float)a_Points;
float fSumX = 0.0f;
float fSumY = 0.0f;
float fSumXY = 0.0f;
float fSumX2 = 0.0f;
for (unsigned int uiPoint = 0; uiPoint < a_Points; uiPoint++)
{
fSumX += a_afX[uiPoint];
fSumY += a_afY[uiPoint];
fSumXY += a_afX[uiPoint] * a_afY[uiPoint];
fSumX2 += a_afX[uiPoint] * a_afX[uiPoint];
}
float fDivisor = fPoints*fSumX2 - fSumX*fSumX;
// if vertical line
if (fDivisor == 0.0f)
{
*a_fSlope = 0.0f;
*a_fOffset = 0.0f;
return true;
}
*a_fSlope = (fPoints*fSumXY - fSumX*fSumY) / fDivisor;
*a_fOffset = (fSumY - (*a_fSlope)*fSumX) / fPoints;
return false;
}
// ----------------------------------------------------------------------------------------------------
//
} // namespace Etc

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <math.h>
namespace Etc
{
// ----------------------------------------------------------------------------------------------------
// return true if vertical line
bool Regression(float a_afX[], float a_afY[], unsigned int a_Points,
float *a_fSlope, float *a_fOffset);
inline float ConvertMSEToPSNR(float a_fMSE)
{
if (a_fMSE == 0.0f)
{
return INFINITY;
}
return 10.0f * log10f(1.0f / a_fMSE);
}
}

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
EtcSortedBlockList.cpp
SortedBlockList is a list of 4x4 blocks that can be used by the "effort" system to prioritize
the encoding of the 4x4 blocks.
The sorting is done with buckets, where each bucket is an indication of how much error each 4x4 block has
*/
#include "EtcConfig.h"
#include "EtcSortedBlockList.h"
#include "EtcBlock4x4.h"
#include <stdio.h>
#include <string.h>
#include <assert.h>
namespace Etc
{
// ----------------------------------------------------------------------------------------------------
// construct an empty list
//
// allocate enough memory to add all of the image's 4x4 blocks later
// allocate enough buckets to sort the blocks
//
SortedBlockList::SortedBlockList(unsigned int a_uiImageBlocks, unsigned int a_uiBuckets)
{
m_uiImageBlocks = a_uiImageBlocks;
m_iBuckets = (int)a_uiBuckets;
m_uiAddedBlocks = 0;
m_uiSortedBlocks = 0;
m_palinkPool = new Link[m_uiImageBlocks];
m_pabucket = new Bucket[m_iBuckets];
m_fMaxError = 0.0f;
InitBuckets();
}
// ----------------------------------------------------------------------------------------------------
//
SortedBlockList::~SortedBlockList(void)
{
delete[] m_palinkPool;
delete[] m_pabucket;
}
// ----------------------------------------------------------------------------------------------------
// add a 4x4 block to the list
// the 4x4 block will be sorted later
//
void SortedBlockList::AddBlock(Block4x4 *a_pblock)
{
assert(m_uiAddedBlocks < m_uiImageBlocks);
Link *plink = &m_palinkPool[m_uiAddedBlocks++];
plink->Init(a_pblock);
}
// ----------------------------------------------------------------------------------------------------
// sort all of the 4x4 blocks that have been added to the list
//
// first, determine the maximum error, then assign an error range to each bucket
// next, determine which bucket each 4x4 block belongs to based on the 4x4 block's error
// add the 4x4 block to the appropriate bucket
// lastly, walk thru the buckets and add each bucket to a sorted linked list
//
// the resultant sorting is an approximate sorting from most to least error
//
void SortedBlockList::Sort(void)
{
assert(m_uiAddedBlocks == m_uiImageBlocks);
InitBuckets();
// find max block error
m_fMaxError = -1.0f;
for (unsigned int uiLink = 0; uiLink < m_uiAddedBlocks; uiLink++)
{
Link *plinkBlock = &m_palinkPool[uiLink];
float fBlockError = plinkBlock->GetBlock()->GetError();
if (fBlockError > m_fMaxError)
{
m_fMaxError = fBlockError;
}
}
// prevent divide by zero or divide by negative
if (m_fMaxError <= 0.0f)
{
m_fMaxError = 1.0f;
}
//used for debugging
//int numDone = 0;
// put all of the blocks with unfinished encodings into the appropriate bucket
m_uiSortedBlocks = 0;
for (unsigned int uiLink = 0; uiLink < m_uiAddedBlocks; uiLink++)
{
Link *plinkBlock = &m_palinkPool[uiLink];
// if the encoding is done, don't add it to the list
if (plinkBlock->GetBlock()->GetEncoding()->IsDone())
{
//numDone++;
continue;
}
// calculate the appropriate sort bucket
float fBlockError = plinkBlock->GetBlock()->GetError();
int iBucket = (int) floorf(m_iBuckets * fBlockError / m_fMaxError);
// clamp to bucket index
iBucket = iBucket < 0 ? 0 : iBucket >= m_iBuckets ? m_iBuckets - 1 : iBucket;
// add block to bucket
{
Bucket *pbucket = &m_pabucket[iBucket];
if (pbucket->plinkLast)
{
pbucket->plinkLast->SetNext(plinkBlock);
pbucket->plinkLast = plinkBlock;
}
else
{
pbucket->plinkFirst = pbucket->plinkLast = plinkBlock;
}
plinkBlock->SetNext(nullptr);
}
m_uiSortedBlocks++;
if (0)
{
printf("%u: e=%.3f\n", uiLink, fBlockError);
Print();
printf("\n\n\n");
}
}
//printf("num blocks already done: %d\n",numDone);
//link the blocks together across buckets
m_plinkFirst = nullptr;
m_plinkLast = nullptr;
for (int iBucket = m_iBuckets - 1; iBucket >= 0; iBucket--)
{
Bucket *pbucket = &m_pabucket[iBucket];
if (pbucket->plinkFirst)
{
if (m_plinkFirst == nullptr)
{
m_plinkFirst = pbucket->plinkFirst;
}
else
{
assert(pbucket->plinkLast->GetNext() == nullptr);
m_plinkLast->SetNext(pbucket->plinkFirst);
}
m_plinkLast = pbucket->plinkLast;
}
}
}
// ----------------------------------------------------------------------------------------------------
// clear all of the buckets. normally done in preparation for a sort
//
void SortedBlockList::InitBuckets(void)
{
for (int iBucket = 0; iBucket < m_iBuckets; iBucket++)
{
Bucket *pbucket = &m_pabucket[iBucket];
pbucket->plinkFirst = 0;
pbucket->plinkLast = 0;
}
}
// ----------------------------------------------------------------------------------------------------
// print out the list of sorted 4x4 blocks
// normally used for debugging
//
void SortedBlockList::Print(void)
{
for (int iBucket = m_iBuckets-1; iBucket >= 0; iBucket--)
{
Bucket *pbucket = &m_pabucket[iBucket];
unsigned int uiBlocks = 0;
for (Link *plink = pbucket->plinkFirst; plink != nullptr; plink = plink->GetNext() )
{
uiBlocks++;
if (plink == pbucket->plinkLast)
{
break;
}
}
float fBucketError = m_fMaxError * iBucket / m_iBuckets;
float fBucketRMS = sqrtf(fBucketError / (4.0f*16.0f) );
printf("%3d: e=%.3f rms=%.6f %u\n", iBucket, fBucketError, fBucketRMS, uiBlocks);
}
}
// ----------------------------------------------------------------------------------------------------
//
} // namespace Etc

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
namespace Etc
{
class Block4x4;
class SortedBlockList
{
public:
class Link
{
public:
inline void Init(Block4x4 *a_pblock)
{
m_pblock = a_pblock;
m_plinkNext = nullptr;
}
inline Block4x4 * GetBlock(void)
{
return m_pblock;
}
inline void SetNext(Link *a_plinkNext)
{
m_plinkNext = a_plinkNext;
}
inline Link * GetNext(void)
{
return m_plinkNext;
}
inline Link * Advance(unsigned int a_uiSteps = 1)
{
Link *plink = this;
for (unsigned int uiStep = 0; uiStep < a_uiSteps; uiStep++)
{
if (plink == nullptr)
{
break;
}
plink = plink->m_plinkNext;
}
return plink;
}
private:
Block4x4 *m_pblock;
Link *m_plinkNext;
};
SortedBlockList(unsigned int a_uiImageBlocks, unsigned int a_uiBuckets);
~SortedBlockList(void);
void AddBlock(Block4x4 *a_pblock);
void Sort(void);
inline Link * GetLinkToFirstBlock(void)
{
return m_plinkFirst;
}
inline unsigned int GetNumberOfAddedBlocks(void)
{
return m_uiAddedBlocks;
}
inline unsigned int GetNumberOfSortedBlocks(void)
{
return m_uiSortedBlocks;
}
void Print(void);
private:
void InitBuckets(void);
class Bucket
{
public:
Link *plinkFirst;
Link *plinkLast;
};
unsigned int m_uiImageBlocks;
int m_iBuckets;
unsigned int m_uiAddedBlocks;
unsigned int m_uiSortedBlocks;
Link *m_palinkPool;
Bucket *m_pabucket;
float m_fMaxError;
Link *m_plinkFirst;
Link *m_plinkLast;
};
} // namespace Etc

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# Etc2Comp - Texture to ETC2 compressor
Etc2Comp is a command line tool that converts textures (e.g. bitmaps)
into the [ETC2](https://en.wikipedia.org/wiki/Ericsson_Texture_Compression)
format. The tool is built with a focus on encoding performance
to reduce the amount of time required to compile asset heavy applications as
well as reduce overall application size.
This repo provides source code that can be compiled into a binary. The
binary can then be used to convert textures to the ETC2 format.
Important: This is not an official Google product. It is an experimental
library published as-is. Please see the CONTRIBUTORS.md file for information
about questions or issues.
## Setup
This project uses [CMake](https://cmake.org/) to generate platform-specific
build files:
- Linux: make files
- OS X: Xcode workspace files
- Microsoft Windows: Visual Studio solution files
- Note: CMake supports other formats, but this doc only provides steps for
one of each platform for brevity.
Refer to each platform's setup section to setup your environment and build
an Etc2Comp binary. Then skip to the usage section of this page for examples
of how to use the library.
### Setup for OS X
build tested on this config:
OS X 10.9.5 i7 16GB RAM
Xcode 5.1.1
cmake 3.2.3
Start by downloading and installing the following components if they are not
already installed on your development machine.
- *Xcode* version 5.1.1, or greater
- [CMake](https://cmake.org/download/) version 3.2.3, or greater
To build the Etc2Comp binary:
1. Open a *Terminal* window and navigate to the project directory.
1. Run `mkdir build_xcode`
1. Run `cd build_xcode`
1. Run `cmake -G Xcode ../`
1. Open *Xcode* and import the `build_xcode/EtcTest.xcodeproj` file.
1. Open the Product menu and choose Build For -> Running.
1. Once the build succeeds the binary located at `build_xcode/EtcTool/Debug/EtcTool`
can be executed.
Optional
Xcode EtcTool Run preferences
note: if the build_xcode/EtcTest.xcodeproj is manually deleted then some Xcode preferences
will need to be set by hand after cmake is run (these prefs are retained across
cmake updates if the .xcodeproj is not deleted/removed)
1. Set the active scheme to EtcTool
1. Edit the scheme
1. Select option Run EtcTool, then tab Arguments.
Add this launch argument: -argfile ../../EtcTool/args.txt
1. Select tab Options and set a custom working directory to: $(SRCROOT)/Build_Xcode/EtcTool
### SetUp for Windows
1. Open a *Terminal* window and navigate to the project directory.
1. Run `mkdir build_vs`
1. Run `cd build_vs`
1. Run CMAKE, noting what build version you need, and pointing to the parent directory as the source root;
For VS 2013 : `cmake -G "Visual Studio 12 2013 Win64" ../`
For VS 2015 : `cmake -G "Visual Studio 14 2015 Win64" ../`
NOTE: To see what supported Visual Studio outputs there are, run `cmake -G`
1. open the 'EtcTest' solution
1. make the 'EtcTool' project the start up project
1. (optional) in the project properties, under 'Debugging ->command arguments'
add the argfile textfile thats included in the EtcTool directory.
example: -argfile C:\etc2\EtcTool\Args.txt
### Setup For Linux
The Linux build was tested on this config:
Ubuntu desktop 14.04
gcc/g++ 4.8
cmake 2.8.12.2
1. Verify linux has cmake and C++-11 capable g++ installed
1. Open shell
1. Run `mkdir build_linux`
1. Run `cd build_linux`
1. Run `cmake ../`
1. Run `make`
1. navigate to the newly created EtcTool directory `cd EtcTool`
1. run the executable: `./EtcTool -argfile ../../EtcTool/args.txt`
Skip to the <a href="#usage">Usage</a> section for more information about using the
tool.
## Usage
### Command Line Usage
EtcTool can be run from the command line with the following usage:
etctool.exe source_image [options ...] -output encoded_image
The encoder will use an array of RGBA floats read from the source_image to create
an ETC1 or ETC2 encoded image in encoded_image. The RGBA floats should be in the
range [0:1].
Options:
-analyze <analysis_folder>
-argfile <arg_file> additional command line arguments read from a file
-blockAtHV <H V> encodes a single block that contains the
pixel specified by the H V coordinates
-compare <comparison_image> compares source_image to comparison_image
-effort <amount> number between 0 and 100 to specify the encoding quality
(100 is the highest quality)
-errormetric <error_metric> specify the error metric, the options are
rgba, rgbx, rec709, numeric and normalxyz
-format <etc_format> ETC1, RGB8, SRGB8, RGBA8, SRGB8, RGB8A1,
SRGB8A1 or R11
-help prints this message
-jobs or -j <thread_count> specifies the number of threads (default=1)
-normalizexyz normalize RGB to have a length of 1
-verbose or -v shows status information during the encoding
process
-mipmaps or -m <mip_count> sets the maximum number of mipaps to generate (default=1)
-mipwrap or -w <x|y|xy> sets the mipmap filter wrap mode (default=clamp)
* -analyze will run an analysis of the encoding and place it in folder
"analysis_folder" (e.g. ../analysis/kodim05). within the analysis_folder, a folder
will be created with a name of the current date/time (e.g. 20151204_153306). this
date/time folder is used to compare encodings of the same texture over time.
within the date/time folder is a text file with several encoding stats and a 2x png
image showing the encoding mode for each 4x4 block.
* -argfile allows additional command line arguments to be placed in a text file
* -blockAtHV selects the 4x4 pixel subset of the source image at position (H,V).
This is mainly used for debugging
* -compare compares the source image to the created encoded image. The encoding
will dictate what error analysis is used in the comparison.
* -effort uses an "amount" between 0 and 100 to determine how much additional effort
to apply during the encoding.
* -errormetric selects the fitting algorithm used by the encoder. "rgba" calculates
RMS error using RGB components that are weighted by A. "rgbx" calculates RMS error
using RGBA components, where A is treated as an additional data channel, instead of
as alpha. "rec709" is similar to "rgba", except the RGB components are also weighted
according to Rec709. "numeric" calculates RMS error using unweighted RGBA components.
"normalize" calculates error based on dot product and vector length for RGB and RMS
error for A.
* -help prints out the usage message
* -jobs enables multi-threading to speed up image encoding
* -normalizexyz normalizes the source RGB to have a length of 1.
* -verbose shows information on the current encoding process. It will then display the
PSNR and time time it took to encode the image.
* -mipmaps takes an argument that specifies how many mipmaps to generate from the
source image. The mipmaps are generated with a lanczos3 filter using edge clamping.
If the mipmaps option is not specified no mipmaps are created.
* -mipwrap takes an argument that specifies the mipmap filter wrap mode. The options
are "x", "y" and "xy" which specify wrapping in x only, y only or x and y respectively.
The default options are clamping in both x and y.
Note: Path names can use slashes or backslashes. The tool will convert the
slashes to the appropriate polarity for the current platform.
## API
The library supports two different APIs - a C-like API that is not heavily
class-based and a class-based API.
main() in EtcTool.cpp contains an example of both APIs.
The Encode() method now returns an EncodingStatus that contains bit flags for
reporting various warnings and flags encountered when encoding.
## Copyright
Copyright 2015 Etc2Comp Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

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// File: rg_etc1.h - Fast, high quality ETC1 block packer/unpacker - Rich Geldreich <richgel99@gmail.com>
// Please see ZLIB license at the end of this file.
#pragma once
namespace rg_etc1
{
// Unpacks an 8-byte ETC1 compressed block to a block of 4x4 32bpp RGBA pixels.
// Returns false if the block is invalid. Invalid blocks will still be unpacked with clamping.
// This function is thread safe, and does not dynamically allocate any memory.
// If preserve_alpha is true, the alpha channel of the destination pixels will not be overwritten. Otherwise, alpha will be set to 255.
bool unpack_etc1_block(const void *pETC1_block, unsigned int* pDst_pixels_rgba, bool preserve_alpha = false);
// Quality setting = the higher the quality, the slower.
// To pack large textures, it is highly recommended to call pack_etc1_block() in parallel, on different blocks, from multiple threads (particularly when using cHighQuality).
enum etc1_quality
{
cLowQuality,
cMediumQuality,
cHighQuality,
};
struct etc1_pack_params
{
etc1_quality m_quality;
bool m_dithering;
inline etc1_pack_params()
{
clear();
}
void clear()
{
m_quality = cHighQuality;
m_dithering = false;
}
};
// Important: pack_etc1_block_init() must be called before calling pack_etc1_block().
void pack_etc1_block_init();
// Packs a 4x4 block of 32bpp RGBA pixels to an 8-byte ETC1 block.
// 32-bit RGBA pixels must always be arranged as (R,G,B,A) (R first, A last) in memory, independent of platform endianness. A should always be 255.
// Returns squared error of result.
// This function is thread safe, and does not dynamically allocate any memory.
// pack_etc1_block() does not currently support "perceptual" colorspace metrics - it primarily optimizes for RGB RMSE.
unsigned int pack_etc1_block(void* pETC1_block, const unsigned int* pSrc_pixels_rgba, etc1_pack_params& pack_params);
} // namespace rg_etc1
//------------------------------------------------------------------------------
//
// rg_etc1 uses the ZLIB license:
// http://opensource.org/licenses/Zlib
//
// Copyright (c) 2012 Rich Geldreich
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would be
// appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not be
// misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
//------------------------------------------------------------------------------