godot/modules/squish/image_compress_squish.cpp
K. S. Ernest (iFire) Lee d840165a32
Add etcpak library for faster ETC/ETC2/S3TC imports.
- `etc` module was renamed to `etcpak` and modified to use the new library.
- PKM importer is removed in the process, it's obsolete.
- Old library `etc2comp` is removed.
- S3TC compression no longer done via `squish` (but decompression still is).
- Slight modifications to etcpak sources for MinGW compatibility,
  to fix LLVM `-Wc++11-narrowing` errors, and to allow using vendored or
  system libpng.

Co-authored-by: Rémi Verschelde <rverschelde@gmail.com>
2021-04-13 00:12:12 +02:00

79 lines
3.9 KiB
C++

/*************************************************************************/
/* image_compress_squish.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
/* */
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/* "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 */
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/* the following conditions: */
/* */
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/* included in all copies or substantial portions of the Software. */
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/*************************************************************************/
#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();
}
}