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/*
* Texture block module
* Copyright (C) 2015 Vittorio Giovara <vittorio.giovara@gmail.com>
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Texture block (4x4) module
*
* References:
* https://www.opengl.org/wiki/S3_Texture_Compression
* https://www.opengl.org/wiki/Red_Green_Texture_Compression
* https://msdn.microsoft.com/en-us/library/bb694531%28v=vs.85%29.aspx
*
* All functions return how much data has been written or read.
*
* Pixel input or output format is always AV_PIX_FMT_RGBA.
*/
#ifndef AVCODEC_TEXTUREDSP_H
#define AVCODEC_TEXTUREDSP_H
#include <stddef.h>
#include <stdint.h>
#define TEXTURE_BLOCK_W 4
#define TEXTURE_BLOCK_H 4
typedef struct TextureDSPContext {
int (*dxt1_block) (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
int (*dxt1a_block) (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
int (*dxt2_block) (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
int (*dxt3_block) (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
int (*dxt4_block) (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
int (*dxt5_block) (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
int (*dxt5y_block) (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
int (*dxt5ys_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
int (*rgtc1s_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
int (*rgtc1u_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
int (*rgtc2s_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
int (*rgtc2u_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
int (*dxn3dc_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
} TextureDSPContext;
void ff_texturedsp_init(TextureDSPContext *c);
void ff_texturedspenc_init(TextureDSPContext *c);
#endif /* AVCODEC_TEXTUREDSP_H */
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