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245 lines
9.2 KiB
C++
245 lines
9.2 KiB
C++
/**************************************************************************/
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/* image_decompress_etcpak.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) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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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_decompress_etcpak.h"
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#include "core/os/os.h"
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#include "core/string/print_string.h"
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#include <DecodeRGB.hpp>
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#define ETCPAK_R_BLOCK_SIZE 8
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#define ETCPAK_RG_BLOCK_SIZE 16
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#define ETCPAK_RGB_BLOCK_SIZE 8
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#define ETCPAK_RGBA_BLOCK_SIZE 16
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template <void (*decompress_func)(const void *, void *, size_t), int block_size, int pixel_size>
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static inline void _safe_decompress_mipmap(int width, int height, const uint8_t *src, uint8_t *dst) {
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// A stack-allocated output buffer large enough to contain an entire uncompressed block.
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uint8_t temp_buf[4 * 4 * pixel_size];
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// The amount of misaligned pixels on each axis.
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const int width_diff = width - (width & ~0x03);
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const int height_diff = height - (height & ~0x03);
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// The amount of uncompressed blocks on each axis.
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const int width_blocks = (width & ~0x03) / 4;
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const int height_blocks = (height & ~0x03) / 4;
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// The pitch of the image in bytes.
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const int image_pitch = width * pixel_size;
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// The pitch of a block in bytes.
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const int block_pitch = 4 * pixel_size;
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// The pitch of the last block in bytes.
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const int odd_pitch = width_diff * pixel_size;
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size_t src_pos = 0;
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size_t dst_pos = 0;
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// Decompress the blocks, starting from the top.
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for (int y = 0; y < height_blocks; y += 1) {
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// Decompress the blocks, starting from the left.
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for (int x = 0; x < width_blocks; x += 1) {
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decompress_func(&src[src_pos], &dst[dst_pos], width);
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src_pos += block_size;
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dst_pos += block_pitch;
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}
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// Decompress the block on the right.
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if (width_diff > 0) {
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decompress_func(&src[src_pos], temp_buf, 4);
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// Copy the data from the temporary buffer to the output.
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for (int i = 0; i < 4; i++) {
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memcpy(&dst[dst_pos + i * image_pitch], &temp_buf[i * block_pitch], odd_pitch);
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}
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src_pos += block_size;
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dst_pos += odd_pitch;
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}
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// Skip to the next row of blocks, the current one has already been filled.
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dst_pos += 3 * image_pitch;
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}
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// Decompress the blocks at the bottom of the image.
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if (height_diff > 0) {
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// Decompress the blocks at the bottom.
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for (int x = 0; x < width_blocks; x += 1) {
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decompress_func(&src[src_pos], temp_buf, 4);
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// Copy the data from the temporary buffer to the output.
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for (int i = 0; i < height_diff; i++) {
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memcpy(&dst[dst_pos + i * image_pitch], &temp_buf[i * block_pitch], block_pitch);
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}
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src_pos += block_size;
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dst_pos += block_pitch;
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}
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// Decompress the block in the lower-right corner.
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if (width_diff > 0) {
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decompress_func(&src[src_pos], temp_buf, 4);
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// Copy the data from the temporary buffer to the output.
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for (int i = 0; i < height_diff; i++) {
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memcpy(&dst[dst_pos + i * image_pitch], &temp_buf[i * block_pitch], odd_pitch);
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}
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src_pos += block_size;
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dst_pos += odd_pitch;
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}
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}
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}
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template <void (*decompress_func)(const void *, void *, size_t), int block_size, int pixel_size>
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static inline void _decompress_mipmap(int width, int height, const uint8_t *src, uint8_t *dst) {
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size_t src_pos = 0;
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size_t dst_pos = 0;
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// The size of a single block in bytes.
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const int block_pitch = 4 * pixel_size;
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for (int y = 0; y < height; y += 4) {
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for (int x = 0; x < width; x += 4) {
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decompress_func(&src[src_pos], &dst[dst_pos], width);
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src_pos += block_size;
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dst_pos += block_pitch;
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}
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// Skip to the next row of blocks, the current one has already been filled.
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dst_pos += 3 * width * pixel_size;
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}
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}
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static void decompress_image(EtcpakFormat format, const void *src, void *dst, const uint64_t width, const uint64_t height) {
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const uint8_t *src_blocks = reinterpret_cast<const uint8_t *>(src);
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uint8_t *dec_blocks = reinterpret_cast<uint8_t *>(dst);
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const uint64_t aligned_width = (width + 3) & ~0x03;
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const uint64_t aligned_height = (height + 3) & ~0x03;
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if (width != aligned_width || height != aligned_height) {
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switch (format) {
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case Etcpak_R: {
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_safe_decompress_mipmap<DecodeRBlock, ETCPAK_R_BLOCK_SIZE, 4>(width, height, src_blocks, dec_blocks);
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} break;
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case Etcpak_RG: {
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_safe_decompress_mipmap<DecodeRGBlock, ETCPAK_RG_BLOCK_SIZE, 4>(width, height, src_blocks, dec_blocks);
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} break;
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case Etcpak_RGB: {
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_safe_decompress_mipmap<DecodeRGBBlock, ETCPAK_RGB_BLOCK_SIZE, 4>(width, height, src_blocks, dec_blocks);
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} break;
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case Etcpak_RGBA: {
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_safe_decompress_mipmap<DecodeRGBABlock, ETCPAK_RGBA_BLOCK_SIZE, 4>(width, height, src_blocks, dec_blocks);
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} break;
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}
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} else {
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switch (format) {
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case Etcpak_R: {
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_decompress_mipmap<DecodeRBlock, ETCPAK_R_BLOCK_SIZE, 4>(width, height, src_blocks, dec_blocks);
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} break;
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case Etcpak_RG: {
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_decompress_mipmap<DecodeRGBlock, ETCPAK_RG_BLOCK_SIZE, 4>(width, height, src_blocks, dec_blocks);
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} break;
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case Etcpak_RGB: {
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_decompress_mipmap<DecodeRGBBlock, ETCPAK_RGB_BLOCK_SIZE, 4>(width, height, src_blocks, dec_blocks);
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} break;
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case Etcpak_RGBA: {
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_decompress_mipmap<DecodeRGBABlock, ETCPAK_RGBA_BLOCK_SIZE, 4>(width, height, src_blocks, dec_blocks);
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} break;
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}
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}
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}
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void _decompress_etc(Image *p_image) {
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uint64_t start_time = OS::get_singleton()->get_ticks_msec();
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int width = p_image->get_width();
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int height = p_image->get_height();
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Image::Format source_format = p_image->get_format();
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Image::Format target_format = Image::FORMAT_RGBA8;
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EtcpakFormat etcpak_format = Etcpak_R;
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switch (source_format) {
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case Image::FORMAT_ETC:
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case Image::FORMAT_ETC2_RGB8:
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etcpak_format = Etcpak_RGB;
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break;
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case Image::FORMAT_ETC2_RGBA8:
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case Image::FORMAT_ETC2_RA_AS_RG:
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etcpak_format = Etcpak_RGBA;
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break;
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case Image::FORMAT_ETC2_R11:
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etcpak_format = Etcpak_R;
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break;
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case Image::FORMAT_ETC2_RG11:
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etcpak_format = Etcpak_RG;
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break;
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default:
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ERR_FAIL_MSG(vformat("etcpak: Can't decompress image %s with an unknown format: %s.", p_image->get_path(), Image::get_format_name(source_format)));
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break;
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}
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int mm_count = p_image->get_mipmap_count();
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int64_t target_size = Image::get_image_data_size(width, height, target_format, p_image->has_mipmaps());
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// Decompressed data.
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Vector<uint8_t> data;
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data.resize(target_size);
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uint8_t *wb = data.ptrw();
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// Source data.
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const uint8_t *rb = p_image->ptr();
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// Decompress mipmaps.
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for (int i = 0; i <= mm_count; i++) {
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int mipmap_w = 0, mipmap_h = 0;
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int64_t src_ofs = Image::get_image_mipmap_offset(width, height, source_format, i);
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int64_t dst_ofs = Image::get_image_mipmap_offset_and_dimensions(width, height, target_format, i, mipmap_w, mipmap_h);
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decompress_image(etcpak_format, rb + src_ofs, wb + dst_ofs, mipmap_w, mipmap_h);
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}
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p_image->set_data(p_image->get_width(), p_image->get_height(), p_image->has_mipmaps(), target_format, data);
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// Swap channels if the format is using a channel swizzle.
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if (source_format == Image::FORMAT_ETC2_RA_AS_RG) {
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p_image->convert_ra_rgba8_to_rg();
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}
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print_verbose(vformat("etcpak: Decompression of %dx%d %s image %s with %d mipmaps took %d ms.",
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p_image->get_width(), p_image->get_height(), Image::get_format_name(source_format), p_image->get_path(), p_image->get_mipmap_count(), OS::get_singleton()->get_ticks_msec() - start_time));
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}
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