162 lines
5.3 KiB
C++
162 lines
5.3 KiB
C++
/*************************************************************************/
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/* image_loader_hdr.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md) */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "image_loader_hdr.h"
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#include "core/os/os.h"
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#include "core/print_string.h"
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#include "thirdparty/tinyexr/tinyexr.h"
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Error ImageLoaderHDR::load_image(Ref<Image> p_image, FileAccess *f, bool p_force_linear, float p_scale) {
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String header = f->get_token();
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ERR_FAIL_COND_V(header != "#?RADIANCE" && header != "#?RGBE", ERR_FILE_UNRECOGNIZED);
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while (true) {
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String line = f->get_line();
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ERR_FAIL_COND_V(f->eof_reached(), ERR_FILE_UNRECOGNIZED);
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if (line == "") // empty line indicates end of header
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break;
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if (line.begins_with("FORMAT=")) { // leave option to implement other commands
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if (line != "FORMAT=32-bit_rle_rgbe") {
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ERR_EXPLAIN("Only 32-bit_rle_rgbe is supported for HDR files.");
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return ERR_FILE_UNRECOGNIZED;
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}
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} else if (!line.begins_with("#")) { // not comment
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WARN_PRINTS("Ignoring unsupported header information in HDR : " + line);
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}
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}
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String token = f->get_token();
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ERR_FAIL_COND_V(token != "-Y", ERR_FILE_CORRUPT);
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int height = f->get_token().to_int();
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token = f->get_token();
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ERR_FAIL_COND_V(token != "+X", ERR_FILE_CORRUPT);
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int width = f->get_line().to_int();
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PoolVector<uint8_t> imgdata;
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imgdata.resize(height * width * sizeof(uint32_t));
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{
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PoolVector<uint8_t>::Write w = imgdata.write();
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uint8_t *ptr = (uint8_t *)w.ptr();
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if (width < 8 || width >= 32768) {
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// Read flat data
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f->get_buffer(ptr, width * height * 4);
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} else {
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// Read RLE-encoded data
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for (int j = 0; j < height; ++j) {
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int c1 = f->get_8();
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int c2 = f->get_8();
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int len = f->get_8();
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if (c1 != 2 || c2 != 2 || (len & 0x80)) {
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// not run-length encoded, so we have to actually use THIS data as a decoded
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// pixel (note this can't be a valid pixel--one of RGB must be >= 128)
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ptr[(j * width) * 4 + 0] = uint8_t(c1);
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ptr[(j * width) * 4 + 1] = uint8_t(c2);
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ptr[(j * width) * 4 + 2] = uint8_t(len);
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ptr[(j * width) * 4 + 3] = f->get_8();
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f->get_buffer(&ptr[(j * width + 1) * 4], (width - 1) * 4);
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continue;
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}
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len <<= 8;
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len |= f->get_8();
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if (len != width) {
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ERR_EXPLAIN("invalid decoded scanline length, corrupt HDR");
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ERR_FAIL_V(ERR_FILE_CORRUPT);
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}
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for (int k = 0; k < 4; ++k) {
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int i = 0;
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while (i < width) {
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int count = f->get_8();
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if (count > 128) {
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// Run
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int value = f->get_8();
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count -= 128;
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for (int z = 0; z < count; ++z)
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ptr[(j * width + i++) * 4 + k] = uint8_t(value);
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} else {
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// Dump
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for (int z = 0; z < count; ++z)
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ptr[(j * width + i++) * 4 + k] = f->get_8();
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}
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}
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}
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}
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}
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//convert
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for (int i = 0; i < width * height; i++) {
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float exp = pow(2.0f, ptr[3] - 128.0f);
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Color c(
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ptr[0] * exp / 255.0,
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ptr[1] * exp / 255.0,
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ptr[2] * exp / 255.0);
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if (p_force_linear) {
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c = c.to_linear();
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}
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*(uint32_t *)ptr = c.to_rgbe9995();
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ptr += 4;
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}
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}
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p_image->create(width, height, false, Image::FORMAT_RGBE9995, imgdata);
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return OK;
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}
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void ImageLoaderHDR::get_recognized_extensions(List<String> *p_extensions) const {
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p_extensions->push_back("hdr");
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}
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ImageLoaderHDR::ImageLoaderHDR() {
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}
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