1/**************************************************************************/
2/* image_decompress_squish.cpp */
3/**************************************************************************/
4/* This file is part of: */
5/* GODOT ENGINE */
6/* https://godotengine.org */
7/**************************************************************************/
8/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
9/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
10/* */
11/* Permission is hereby granted, free of charge, to any person obtaining */
12/* a copy of this software and associated documentation files (the */
13/* "Software"), to deal in the Software without restriction, including */
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15/* distribute, sublicense, and/or sell copies of the Software, and to */
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17/* the following conditions: */
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20/* included in all copies or substantial portions of the Software. */
21/* */
22/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
23/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
24/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
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28/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
29/**************************************************************************/
30
31#include "image_decompress_squish.h"
32
33#include <squish.h>
34
35void image_decompress_squish(Image *p_image) {
36 int w = p_image->get_width();
37 int h = p_image->get_height();
38
39 Image::Format target_format = Image::FORMAT_RGBA8;
40 Vector<uint8_t> data;
41 int target_size = Image::get_image_data_size(w, h, target_format, p_image->has_mipmaps());
42 int mm_count = p_image->get_mipmap_count();
43 data.resize(target_size);
44
45 const uint8_t *rb = p_image->get_data().ptr();
46 uint8_t *wb = data.ptrw();
47
48 int squish_flags = Image::FORMAT_MAX;
49 if (p_image->get_format() == Image::FORMAT_DXT1) {
50 squish_flags = squish::kDxt1;
51 } else if (p_image->get_format() == Image::FORMAT_DXT3) {
52 squish_flags = squish::kDxt3;
53 } else if (p_image->get_format() == Image::FORMAT_DXT5 || p_image->get_format() == Image::FORMAT_DXT5_RA_AS_RG) {
54 squish_flags = squish::kDxt5;
55 } else if (p_image->get_format() == Image::FORMAT_RGTC_R) {
56 squish_flags = squish::kBc4;
57 } else if (p_image->get_format() == Image::FORMAT_RGTC_RG) {
58 squish_flags = squish::kBc5;
59 } else {
60 ERR_FAIL_MSG("Squish: Can't decompress unknown format: " + itos(p_image->get_format()) + ".");
61 }
62
63 for (int i = 0; i <= mm_count; i++) {
64 int src_ofs = 0, mipmap_size = 0, mipmap_w = 0, mipmap_h = 0;
65 p_image->get_mipmap_offset_size_and_dimensions(i, src_ofs, mipmap_size, mipmap_w, mipmap_h);
66 int dst_ofs = Image::get_image_mipmap_offset(p_image->get_width(), p_image->get_height(), target_format, i);
67 squish::DecompressImage(&wb[dst_ofs], w, h, &rb[src_ofs], squish_flags);
68 w >>= 1;
69 h >>= 1;
70 }
71
72 p_image->set_data(p_image->get_width(), p_image->get_height(), p_image->has_mipmaps(), target_format, data);
73
74 if (p_image->get_format() == Image::FORMAT_DXT5_RA_AS_RG) {
75 p_image->convert_ra_rgba8_to_rg();
76 }
77}
78