da113fe40d
-Added ability to convert xml and tscn scenes to binary on export, makes loading of larger scenes faster
319 lines
11 KiB
C
319 lines
11 KiB
C
// Copyright 2010 Google Inc. All Rights Reserved.
|
|
//
|
|
// Use of this source code is governed by a BSD-style license
|
|
// that can be found in the COPYING file in the root of the source
|
|
// tree. An additional intellectual property rights grant can be found
|
|
// in the file PATENTS. All contributing project authors may
|
|
// be found in the AUTHORS file in the root of the source tree.
|
|
// -----------------------------------------------------------------------------
|
|
//
|
|
// inline YUV<->RGB conversion function
|
|
//
|
|
// The exact naming is Y'CbCr, following the ITU-R BT.601 standard.
|
|
// More information at: http://en.wikipedia.org/wiki/YCbCr
|
|
// Y = 0.2569 * R + 0.5044 * G + 0.0979 * B + 16
|
|
// U = -0.1483 * R - 0.2911 * G + 0.4394 * B + 128
|
|
// V = 0.4394 * R - 0.3679 * G - 0.0715 * B + 128
|
|
// We use 16bit fixed point operations for RGB->YUV conversion (YUV_FIX).
|
|
//
|
|
// For the Y'CbCr to RGB conversion, the BT.601 specification reads:
|
|
// R = 1.164 * (Y-16) + 1.596 * (V-128)
|
|
// G = 1.164 * (Y-16) - 0.813 * (V-128) - 0.391 * (U-128)
|
|
// B = 1.164 * (Y-16) + 2.018 * (U-128)
|
|
// where Y is in the [16,235] range, and U/V in the [16,240] range.
|
|
// In the table-lookup version (WEBP_YUV_USE_TABLE), the common factor
|
|
// "1.164 * (Y-16)" can be handled as an offset in the VP8kClip[] table.
|
|
// So in this case the formulae should read:
|
|
// R = 1.164 * [Y + 1.371 * (V-128) ] - 18.624
|
|
// G = 1.164 * [Y - 0.698 * (V-128) - 0.336 * (U-128)] - 18.624
|
|
// B = 1.164 * [Y + 1.733 * (U-128)] - 18.624
|
|
// once factorized.
|
|
// For YUV->RGB conversion, only 14bit fixed precision is used (YUV_FIX2).
|
|
// That's the maximum possible for a convenient ARM implementation.
|
|
//
|
|
// Author: Skal (pascal.massimino@gmail.com)
|
|
|
|
#ifndef WEBP_DSP_YUV_H_
|
|
#define WEBP_DSP_YUV_H_
|
|
|
|
#include "./dsp.h"
|
|
#include "../dec/decode_vp8.h"
|
|
|
|
// Define the following to use the LUT-based code:
|
|
// #define WEBP_YUV_USE_TABLE
|
|
|
|
#if defined(WEBP_EXPERIMENTAL_FEATURES)
|
|
// Do NOT activate this feature for real compression. This is only experimental!
|
|
// This flag is for comparison purpose against JPEG's "YUVj" natural colorspace.
|
|
// This colorspace is close to Rec.601's Y'CbCr model with the notable
|
|
// difference of allowing larger range for luma/chroma.
|
|
// See http://en.wikipedia.org/wiki/YCbCr#JPEG_conversion paragraph, and its
|
|
// difference with http://en.wikipedia.org/wiki/YCbCr#ITU-R_BT.601_conversion
|
|
// #define USE_YUVj
|
|
#endif
|
|
|
|
//------------------------------------------------------------------------------
|
|
// YUV -> RGB conversion
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
enum {
|
|
YUV_FIX = 16, // fixed-point precision for RGB->YUV
|
|
YUV_HALF = 1 << (YUV_FIX - 1),
|
|
YUV_MASK = (256 << YUV_FIX) - 1,
|
|
YUV_RANGE_MIN = -227, // min value of r/g/b output
|
|
YUV_RANGE_MAX = 256 + 226, // max value of r/g/b output
|
|
|
|
YUV_FIX2 = 14, // fixed-point precision for YUV->RGB
|
|
YUV_HALF2 = 1 << (YUV_FIX2 - 1),
|
|
YUV_MASK2 = (256 << YUV_FIX2) - 1
|
|
};
|
|
|
|
// These constants are 14b fixed-point version of ITU-R BT.601 constants.
|
|
#define kYScale 19077 // 1.164 = 255 / 219
|
|
#define kVToR 26149 // 1.596 = 255 / 112 * 0.701
|
|
#define kUToG 6419 // 0.391 = 255 / 112 * 0.886 * 0.114 / 0.587
|
|
#define kVToG 13320 // 0.813 = 255 / 112 * 0.701 * 0.299 / 0.587
|
|
#define kUToB 33050 // 2.018 = 255 / 112 * 0.886
|
|
#define kRCst (-kYScale * 16 - kVToR * 128 + YUV_HALF2)
|
|
#define kGCst (-kYScale * 16 + kUToG * 128 + kVToG * 128 + YUV_HALF2)
|
|
#define kBCst (-kYScale * 16 - kUToB * 128 + YUV_HALF2)
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
#if !defined(WEBP_YUV_USE_TABLE)
|
|
|
|
// slower on x86 by ~7-8%, but bit-exact with the SSE2 version
|
|
|
|
static WEBP_INLINE int VP8Clip8(int v) {
|
|
return ((v & ~YUV_MASK2) == 0) ? (v >> YUV_FIX2) : (v < 0) ? 0 : 255;
|
|
}
|
|
|
|
static WEBP_INLINE int VP8YUVToR(int y, int v) {
|
|
return VP8Clip8(kYScale * y + kVToR * v + kRCst);
|
|
}
|
|
|
|
static WEBP_INLINE int VP8YUVToG(int y, int u, int v) {
|
|
return VP8Clip8(kYScale * y - kUToG * u - kVToG * v + kGCst);
|
|
}
|
|
|
|
static WEBP_INLINE int VP8YUVToB(int y, int u) {
|
|
return VP8Clip8(kYScale * y + kUToB * u + kBCst);
|
|
}
|
|
|
|
static WEBP_INLINE void VP8YuvToRgb(int y, int u, int v,
|
|
uint8_t* const rgb) {
|
|
rgb[0] = VP8YUVToR(y, v);
|
|
rgb[1] = VP8YUVToG(y, u, v);
|
|
rgb[2] = VP8YUVToB(y, u);
|
|
}
|
|
|
|
static WEBP_INLINE void VP8YuvToBgr(int y, int u, int v,
|
|
uint8_t* const bgr) {
|
|
bgr[0] = VP8YUVToB(y, u);
|
|
bgr[1] = VP8YUVToG(y, u, v);
|
|
bgr[2] = VP8YUVToR(y, v);
|
|
}
|
|
|
|
static WEBP_INLINE void VP8YuvToRgb565(int y, int u, int v,
|
|
uint8_t* const rgb) {
|
|
const int r = VP8YUVToR(y, v); // 5 usable bits
|
|
const int g = VP8YUVToG(y, u, v); // 6 usable bits
|
|
const int b = VP8YUVToB(y, u); // 5 usable bits
|
|
const int rg = (r & 0xf8) | (g >> 5);
|
|
const int gb = ((g << 3) & 0xe0) | (b >> 3);
|
|
#ifdef WEBP_SWAP_16BIT_CSP
|
|
rgb[0] = gb;
|
|
rgb[1] = rg;
|
|
#else
|
|
rgb[0] = rg;
|
|
rgb[1] = gb;
|
|
#endif
|
|
}
|
|
|
|
static WEBP_INLINE void VP8YuvToRgba4444(int y, int u, int v,
|
|
uint8_t* const argb) {
|
|
const int r = VP8YUVToR(y, v); // 4 usable bits
|
|
const int g = VP8YUVToG(y, u, v); // 4 usable bits
|
|
const int b = VP8YUVToB(y, u); // 4 usable bits
|
|
const int rg = (r & 0xf0) | (g >> 4);
|
|
const int ba = (b & 0xf0) | 0x0f; // overwrite the lower 4 bits
|
|
#ifdef WEBP_SWAP_16BIT_CSP
|
|
argb[0] = ba;
|
|
argb[1] = rg;
|
|
#else
|
|
argb[0] = rg;
|
|
argb[1] = ba;
|
|
#endif
|
|
}
|
|
|
|
#else
|
|
|
|
// Table-based version, not totally equivalent to the SSE2 version.
|
|
// Rounding diff is only +/-1 though.
|
|
|
|
extern int16_t VP8kVToR[256], VP8kUToB[256];
|
|
extern int32_t VP8kVToG[256], VP8kUToG[256];
|
|
extern uint8_t VP8kClip[YUV_RANGE_MAX - YUV_RANGE_MIN];
|
|
extern uint8_t VP8kClip4Bits[YUV_RANGE_MAX - YUV_RANGE_MIN];
|
|
|
|
static WEBP_INLINE void VP8YuvToRgb(int y, int u, int v,
|
|
uint8_t* const rgb) {
|
|
const int r_off = VP8kVToR[v];
|
|
const int g_off = (VP8kVToG[v] + VP8kUToG[u]) >> YUV_FIX;
|
|
const int b_off = VP8kUToB[u];
|
|
rgb[0] = VP8kClip[y + r_off - YUV_RANGE_MIN];
|
|
rgb[1] = VP8kClip[y + g_off - YUV_RANGE_MIN];
|
|
rgb[2] = VP8kClip[y + b_off - YUV_RANGE_MIN];
|
|
}
|
|
|
|
static WEBP_INLINE void VP8YuvToBgr(int y, int u, int v,
|
|
uint8_t* const bgr) {
|
|
const int r_off = VP8kVToR[v];
|
|
const int g_off = (VP8kVToG[v] + VP8kUToG[u]) >> YUV_FIX;
|
|
const int b_off = VP8kUToB[u];
|
|
bgr[0] = VP8kClip[y + b_off - YUV_RANGE_MIN];
|
|
bgr[1] = VP8kClip[y + g_off - YUV_RANGE_MIN];
|
|
bgr[2] = VP8kClip[y + r_off - YUV_RANGE_MIN];
|
|
}
|
|
|
|
static WEBP_INLINE void VP8YuvToRgb565(int y, int u, int v,
|
|
uint8_t* const rgb) {
|
|
const int r_off = VP8kVToR[v];
|
|
const int g_off = (VP8kVToG[v] + VP8kUToG[u]) >> YUV_FIX;
|
|
const int b_off = VP8kUToB[u];
|
|
const int rg = ((VP8kClip[y + r_off - YUV_RANGE_MIN] & 0xf8) |
|
|
(VP8kClip[y + g_off - YUV_RANGE_MIN] >> 5));
|
|
const int gb = (((VP8kClip[y + g_off - YUV_RANGE_MIN] << 3) & 0xe0) |
|
|
(VP8kClip[y + b_off - YUV_RANGE_MIN] >> 3));
|
|
#ifdef WEBP_SWAP_16BIT_CSP
|
|
rgb[0] = gb;
|
|
rgb[1] = rg;
|
|
#else
|
|
rgb[0] = rg;
|
|
rgb[1] = gb;
|
|
#endif
|
|
}
|
|
|
|
static WEBP_INLINE void VP8YuvToRgba4444(int y, int u, int v,
|
|
uint8_t* const argb) {
|
|
const int r_off = VP8kVToR[v];
|
|
const int g_off = (VP8kVToG[v] + VP8kUToG[u]) >> YUV_FIX;
|
|
const int b_off = VP8kUToB[u];
|
|
const int rg = ((VP8kClip4Bits[y + r_off - YUV_RANGE_MIN] << 4) |
|
|
VP8kClip4Bits[y + g_off - YUV_RANGE_MIN]);
|
|
const int ba = (VP8kClip4Bits[y + b_off - YUV_RANGE_MIN] << 4) | 0x0f;
|
|
#ifdef WEBP_SWAP_16BIT_CSP
|
|
argb[0] = ba;
|
|
argb[1] = rg;
|
|
#else
|
|
argb[0] = rg;
|
|
argb[1] = ba;
|
|
#endif
|
|
}
|
|
|
|
#endif // WEBP_YUV_USE_TABLE
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// Alpha handling variants
|
|
|
|
static WEBP_INLINE void VP8YuvToArgb(uint8_t y, uint8_t u, uint8_t v,
|
|
uint8_t* const argb) {
|
|
argb[0] = 0xff;
|
|
VP8YuvToRgb(y, u, v, argb + 1);
|
|
}
|
|
|
|
static WEBP_INLINE void VP8YuvToBgra(uint8_t y, uint8_t u, uint8_t v,
|
|
uint8_t* const bgra) {
|
|
VP8YuvToBgr(y, u, v, bgra);
|
|
bgra[3] = 0xff;
|
|
}
|
|
|
|
static WEBP_INLINE void VP8YuvToRgba(uint8_t y, uint8_t u, uint8_t v,
|
|
uint8_t* const rgba) {
|
|
VP8YuvToRgb(y, u, v, rgba);
|
|
rgba[3] = 0xff;
|
|
}
|
|
|
|
// Must be called before everything, to initialize the tables.
|
|
void VP8YUVInit(void);
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// SSE2 extra functions (mostly for upsampling_sse2.c)
|
|
|
|
#if defined(WEBP_USE_SSE2)
|
|
|
|
// When the following is defined, tables are initialized statically, adding ~12k
|
|
// to the binary size. Otherwise, they are initialized at run-time (small cost).
|
|
#define WEBP_YUV_USE_SSE2_TABLES
|
|
|
|
// Process 32 pixels and store the result (24b or 32b per pixel) in *dst.
|
|
void VP8YuvToRgba32(const uint8_t* y, const uint8_t* u, const uint8_t* v,
|
|
uint8_t* dst);
|
|
void VP8YuvToRgb32(const uint8_t* y, const uint8_t* u, const uint8_t* v,
|
|
uint8_t* dst);
|
|
void VP8YuvToBgra32(const uint8_t* y, const uint8_t* u, const uint8_t* v,
|
|
uint8_t* dst);
|
|
void VP8YuvToBgr32(const uint8_t* y, const uint8_t* u, const uint8_t* v,
|
|
uint8_t* dst);
|
|
|
|
// Must be called to initialize tables before using the functions.
|
|
void VP8YUVInitSSE2(void);
|
|
|
|
#endif // WEBP_USE_SSE2
|
|
|
|
//------------------------------------------------------------------------------
|
|
// RGB -> YUV conversion
|
|
|
|
// Stub functions that can be called with various rounding values:
|
|
static WEBP_INLINE int VP8ClipUV(int uv, int rounding) {
|
|
uv = (uv + rounding + (128 << (YUV_FIX + 2))) >> (YUV_FIX + 2);
|
|
return ((uv & ~0xff) == 0) ? uv : (uv < 0) ? 0 : 255;
|
|
}
|
|
|
|
#ifndef USE_YUVj
|
|
|
|
static WEBP_INLINE int VP8RGBToY(int r, int g, int b, int rounding) {
|
|
const int luma = 16839 * r + 33059 * g + 6420 * b;
|
|
return (luma + rounding + (16 << YUV_FIX)) >> YUV_FIX; // no need to clip
|
|
}
|
|
|
|
static WEBP_INLINE int VP8RGBToU(int r, int g, int b, int rounding) {
|
|
const int u = -9719 * r - 19081 * g + 28800 * b;
|
|
return VP8ClipUV(u, rounding);
|
|
}
|
|
|
|
static WEBP_INLINE int VP8RGBToV(int r, int g, int b, int rounding) {
|
|
const int v = +28800 * r - 24116 * g - 4684 * b;
|
|
return VP8ClipUV(v, rounding);
|
|
}
|
|
|
|
#else
|
|
|
|
// This JPEG-YUV colorspace, only for comparison!
|
|
// These are also 16bit precision coefficients from Rec.601, but with full
|
|
// [0..255] output range.
|
|
static WEBP_INLINE int VP8RGBToY(int r, int g, int b, int rounding) {
|
|
const int luma = 19595 * r + 38470 * g + 7471 * b;
|
|
return (luma + rounding) >> YUV_FIX; // no need to clip
|
|
}
|
|
|
|
static WEBP_INLINE int VP8RGBToU(int r, int g, int b, int rounding) {
|
|
const int u = -11058 * r - 21710 * g + 32768 * b;
|
|
return VP8ClipUV(u, rounding);
|
|
}
|
|
|
|
static WEBP_INLINE int VP8RGBToV(int r, int g, int b, int rounding) {
|
|
const int v = 32768 * r - 27439 * g - 5329 * b;
|
|
return VP8ClipUV(v, rounding);
|
|
}
|
|
|
|
#endif // USE_YUVj
|
|
|
|
#ifdef __cplusplus
|
|
} // extern "C"
|
|
#endif
|
|
|
|
#endif /* WEBP_DSP_YUV_H_ */
|