Alexander Suvorov
110 lines
4.8 KiB
C++
110 lines
4.8 KiB
C++
/* Copyright (c) 2013, Evan Parker, Brandon Jones. All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
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#define PLATFORM_NACL // This disables use of 64 bit integers, among other things.
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#include <stddef.h> // For NULL, size_t
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#include <cstring> // for malloc etc
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#include "crn_decomp.h"
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extern "C" {
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unsigned int crn_get_width(void* src, unsigned int src_size);
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unsigned int crn_get_height(void* src, unsigned int src_size);
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unsigned int crn_get_levels(void* src, unsigned int src_size);
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unsigned int crn_get_dxt_format(void* src, unsigned int src_size);
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unsigned int crn_get_bytes_per_block(void* src, unsigned int src_size);
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unsigned int crn_get_uncompressed_size(void* p, unsigned int size, unsigned int level);
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void crn_decompress(void* src, unsigned int src_size, void* dst, unsigned int dst_size, unsigned int firstLevel, unsigned int levelCount);
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}
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unsigned int crn_get_width(void* src, unsigned int src_size) {
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crnd::crn_texture_info tex_info;
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crnd::crnd_get_texture_info(static_cast<crn_uint8*>(src), src_size, &tex_info);
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return tex_info.m_width;
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}
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unsigned int crn_get_height(void* src, unsigned int src_size) {
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crnd::crn_texture_info tex_info;
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crnd::crnd_get_texture_info(static_cast<crn_uint8*>(src), src_size, &tex_info);
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return tex_info.m_height;
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}
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unsigned int crn_get_levels(void* src, unsigned int src_size) {
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crnd::crn_texture_info tex_info;
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crnd::crnd_get_texture_info(static_cast<crn_uint8*>(src), src_size, &tex_info);
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return tex_info.m_levels;
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}
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unsigned int crn_get_dxt_format(void* src, unsigned int src_size) {
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crnd::crn_texture_info tex_info;
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crnd::crnd_get_texture_info(static_cast<crn_uint8*>(src), src_size, &tex_info);
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return tex_info.m_format;
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}
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unsigned int crn_get_bytes_per_block(void* src, unsigned int src_size) {
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crnd::crn_texture_info tex_info;
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crnd::crnd_get_texture_info(static_cast<crn_uint8*>(src), src_size, &tex_info);
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return crnd::crnd_get_bytes_per_dxt_block(tex_info.m_format);
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}
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unsigned int crn_get_uncompressed_size(void* src, unsigned int src_size, unsigned int level) {
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crnd::crn_texture_info tex_info;
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crnd::crnd_get_texture_info(static_cast<crn_uint8*>(src), src_size, &tex_info);
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const crn_uint32 width = tex_info.m_width >> level;
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const crn_uint32 height = tex_info.m_height >> level;
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const crn_uint32 blocks_x = (width + 3) >> 2;
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const crn_uint32 blocks_y = (height + 3) >> 2;
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const crn_uint32 row_pitch = blocks_x * crnd::crnd_get_bytes_per_dxt_block(tex_info.m_format);
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const crn_uint32 total_face_size = row_pitch * blocks_y;
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return total_face_size;
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}
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void crn_decompress(void* src, unsigned int src_size, void* dst, unsigned int dst_size, unsigned int firstLevel, unsigned int levelCount) {
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crnd::crn_texture_info tex_info;
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crnd::crnd_get_texture_info(static_cast<crn_uint8*>(src), src_size, &tex_info);
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crn_uint32 width = tex_info.m_width >> firstLevel;
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crn_uint32 height = tex_info.m_height >> firstLevel;
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crn_uint32 bytes_per_block = crnd::crnd_get_bytes_per_dxt_block(tex_info.m_format);
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void* pDecomp_images[1];
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pDecomp_images[0] = dst;
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crnd::crnd_unpack_context pContext =
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crnd::crnd_unpack_begin(static_cast<crn_uint8*>(src), src_size);
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for (int i = firstLevel; i < firstLevel + levelCount; ++i) {
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crn_uint32 blocks_x = (width + 3) >> 2;
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crn_uint32 blocks_y = (height + 3) >> 2;
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crn_uint32 row_pitch = blocks_x * bytes_per_block;
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crn_uint32 total_level_size = row_pitch * blocks_y;
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crnd::crnd_unpack_level(pContext, pDecomp_images, total_level_size, row_pitch, i);
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pDecomp_images[0] = (char*)pDecomp_images[0] + total_level_size;
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width = width >> 1;
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height = height >> 1;
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}
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crnd::crnd_unpack_end(pContext);
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} |