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/*************************************************************************/
/* image_compress_squish.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2020 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_compress_squish.h"
#include <squish.h>
void image_decompress_squish(Image *p_image) {
int w = p_image->get_width();
int h = p_image->get_height();
Image::Format target_format = Image::FORMAT_RGBA8;
Vector<uint8_t> data;
int target_size = Image::get_image_data_size(w, h, target_format, p_image->has_mipmaps());
int mm_count = p_image->get_mipmap_count();
data.resize(target_size);
const uint8_t *rb = p_image->get_data().ptr();
uint8_t *wb = data.ptrw();
int squish_flags = Image::FORMAT_MAX;
if (p_image->get_format() == Image::FORMAT_DXT1) {
squish_flags = squish::kDxt1;
} else if (p_image->get_format() == Image::FORMAT_DXT3) {
squish_flags = squish::kDxt3;
} else if (p_image->get_format() == Image::FORMAT_DXT5 || p_image->get_format() == Image::FORMAT_DXT5_RA_AS_RG) {
squish_flags = squish::kDxt5;
} else if (p_image->get_format() == Image::FORMAT_RGTC_R) {
squish_flags = squish::kBc4;
} else if (p_image->get_format() == Image::FORMAT_RGTC_RG) {
squish_flags = squish::kBc5;
} else {
ERR_FAIL_MSG("Squish: Can't decompress unknown format: " + itos(p_image->get_format()) + ".");
return;
}
for (int i = 0; i <= mm_count; i++) {
int src_ofs = 0, mipmap_size = 0, mipmap_w = 0, mipmap_h = 0;
p_image->get_mipmap_offset_size_and_dimensions(i, src_ofs, mipmap_size, mipmap_w, mipmap_h);
int dst_ofs = Image::get_image_mipmap_offset(p_image->get_width(), p_image->get_height(), target_format, i);
squish::DecompressImage(&wb[dst_ofs], w, h, &rb[src_ofs], squish_flags);
w >>= 1;
h >>= 1;
}
p_image->create(p_image->get_width(), p_image->get_height(), p_image->has_mipmaps(), target_format, data);
if (p_image->get_format() == Image::FORMAT_DXT5_RA_AS_RG) {
p_image->convert_ra_rgba8_to_rg();
}
}
void image_compress_squish(Image *p_image, float p_lossy_quality, Image::UsedChannels p_channels) {
if (p_image->get_format() >= Image::FORMAT_DXT1)
return; //do not compress, already compressed
int w = p_image->get_width();
int h = p_image->get_height();
if (p_image->get_format() <= Image::FORMAT_RGBA8) {
int squish_comp = squish::kColourRangeFit;
if (p_lossy_quality > 0.85)
squish_comp = squish::kColourIterativeClusterFit;
else if (p_lossy_quality > 0.75)
squish_comp = squish::kColourClusterFit;
Image::Format target_format = Image::FORMAT_RGBA8;
p_image->convert(Image::FORMAT_RGBA8); //still uses RGBA to convert
switch (p_channels) {
case Image::USED_CHANNELS_L: {
target_format = Image::FORMAT_DXT1;
squish_comp |= squish::kDxt1;
} break;
case Image::USED_CHANNELS_LA: {
target_format = Image::FORMAT_DXT5;
squish_comp |= squish::kDxt5;
} break;
case Image::USED_CHANNELS_R: {
target_format = Image::FORMAT_RGTC_R;
squish_comp |= squish::kBc4;
} break;
case Image::USED_CHANNELS_RG: {
target_format = Image::FORMAT_RGTC_RG;
squish_comp |= squish::kBc5;
} break;
case Image::USED_CHANNELS_RGB: {
target_format = Image::FORMAT_DXT1;
squish_comp |= squish::kDxt1;
} break;
case Image::USED_CHANNELS_RGBA: {
//TODO, should convert both, then measure which one does a better job
target_format = Image::FORMAT_DXT5;
squish_comp |= squish::kDxt5;
} break;
default: {
ERR_PRINT("Unknown image format, defaulting to RGBA8");
break;
}
}
Vector<uint8_t> data;
int target_size = Image::get_image_data_size(w, h, target_format, p_image->has_mipmaps());
int mm_count = p_image->has_mipmaps() ? Image::get_image_required_mipmaps(w, h, target_format) : 0;
data.resize(target_size);
int shift = Image::get_format_pixel_rshift(target_format);
const uint8_t *rb = p_image->get_data().ptr();
uint8_t *wb = data.ptrw();
int dst_ofs = 0;
for (int i = 0; i <= mm_count; i++) {
int bw = w % 4 != 0 ? w + (4 - w % 4) : w;
int bh = h % 4 != 0 ? h + (4 - h % 4) : h;
int src_ofs = p_image->get_mipmap_offset(i);
squish::CompressImage(&rb[src_ofs], w, h, &wb[dst_ofs], squish_comp);
dst_ofs += (MAX(4, bw) * MAX(4, bh)) >> shift;
w = MAX(w / 2, 1);
h = MAX(h / 2, 1);
}
p_image->create(p_image->get_width(), p_image->get_height(), p_image->has_mipmaps(), target_format, data);
}
}
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