godot/modules/hdr/image_loader_hdr.cpp
2024-08-09 22:39:30 +02:00

164 lines
5.9 KiB
C++

/**************************************************************************/
/* image_loader_hdr.cpp */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* 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_loader_hdr.h"
#include "core/os/os.h"
#include "core/string/print_string.h"
Error ImageLoaderHDR::load_image(Ref<Image> p_image, Ref<FileAccess> f, BitField<ImageFormatLoader::LoaderFlags> p_flags, float p_scale) {
String header = f->get_token();
ERR_FAIL_COND_V_MSG(header != "#?RADIANCE" && header != "#?RGBE", ERR_FILE_UNRECOGNIZED, "Unsupported header information in HDR: " + header + ".");
while (true) {
String line = f->get_line();
ERR_FAIL_COND_V(f->eof_reached(), ERR_FILE_UNRECOGNIZED);
if (line.is_empty()) { // empty line indicates end of header
break;
}
if (line.begins_with("FORMAT=")) { // leave option to implement other commands
ERR_FAIL_COND_V_MSG(line != "FORMAT=32-bit_rle_rgbe", ERR_FILE_UNRECOGNIZED, "Only 32-bit_rle_rgbe is supported for HDR files.");
} else if (!line.begins_with("#")) { // not comment
WARN_PRINT("Ignoring unsupported header information in HDR: " + line + ".");
}
}
String token = f->get_token();
ERR_FAIL_COND_V(token != "-Y", ERR_FILE_CORRUPT);
int height = f->get_token().to_int();
token = f->get_token();
ERR_FAIL_COND_V(token != "+X", ERR_FILE_CORRUPT);
int width = f->get_line().to_int();
Vector<uint8_t> imgdata;
imgdata.resize(height * width * (int)sizeof(uint32_t));
{
uint8_t *ptr = imgdata.ptrw();
Vector<uint8_t> temp_read_data;
temp_read_data.resize(128);
uint8_t *temp_read_ptr = temp_read_data.ptrw();
if (width < 8 || width >= 32768) {
// Read flat data
f->get_buffer(ptr, (uint64_t)width * height * 4);
} else {
// Read RLE-encoded data
for (int j = 0; j < height; ++j) {
int c1 = f->get_8();
int c2 = f->get_8();
int len = f->get_8();
if (c1 != 2 || c2 != 2 || (len & 0x80)) {
// not run-length encoded, so we have to actually use THIS data as a decoded
// pixel (note this can't be a valid pixel--one of RGB must be >= 128)
ptr[(j * width) * 4 + 0] = uint8_t(c1);
ptr[(j * width) * 4 + 1] = uint8_t(c2);
ptr[(j * width) * 4 + 2] = uint8_t(len);
ptr[(j * width) * 4 + 3] = f->get_8();
f->get_buffer(&ptr[(j * width + 1) * 4], (width - 1) * 4);
continue;
}
len <<= 8;
len |= f->get_8();
ERR_FAIL_COND_V_MSG(len != width, ERR_FILE_CORRUPT, "Invalid decoded scanline length, corrupt HDR.");
for (int k = 0; k < 4; ++k) {
int i = 0;
while (i < width) {
int count = f->get_8();
if (count > 128) {
// Run
int value = f->get_8();
count -= 128;
for (int z = 0; z < count; ++z) {
ptr[(j * width + i++) * 4 + k] = uint8_t(value);
}
} else {
// Dump
f->get_buffer(temp_read_ptr, count);
for (int z = 0; z < count; ++z) {
ptr[(j * width + i++) * 4 + k] = temp_read_ptr[z];
}
}
}
}
}
}
const bool force_linear = p_flags & FLAG_FORCE_LINEAR;
//convert
for (int i = 0; i < width * height; i++) {
int e = ptr[3] - 128;
if (force_linear || (e < -15 || e > 15)) {
float exp = pow(2.0f, e);
Color c(ptr[0] * exp / 255.0, ptr[1] * exp / 255.0, ptr[2] * exp / 255.0);
if (force_linear) {
c = c.srgb_to_linear();
}
*(uint32_t *)ptr = c.to_rgbe9995();
} else {
// https://github.com/george-steel/rgbe-rs/blob/e7cc33b7f42b4eb3272c166dac75385e48687c92/src/types.rs#L123-L129
uint32_t e5 = (uint32_t)(e + 15);
*(uint32_t *)ptr = ((e5 << 27) | ((uint32_t)ptr[2] << 19) | ((uint32_t)ptr[1] << 10) | ((uint32_t)ptr[0] << 1));
}
ptr += 4;
}
}
p_image->set_data(width, height, false, Image::FORMAT_RGBE9995, imgdata);
return OK;
}
void ImageLoaderHDR::get_recognized_extensions(List<String> *p_extensions) const {
p_extensions->push_back("hdr");
}
ImageLoaderHDR::ImageLoaderHDR() {
}