FFmpeg
texturedsp.h
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1 /*
2  * Texture block module
3  * Copyright (C) 2015 Vittorio Giovara <vittorio.giovara@gmail.com>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * Texture block (4x4) module
25  *
26  * References:
27  * https://www.opengl.org/wiki/S3_Texture_Compression
28  * https://www.opengl.org/wiki/Red_Green_Texture_Compression
29  * https://msdn.microsoft.com/en-us/library/bb694531%28v=vs.85%29.aspx
30  *
31  * All functions return how much data has been written or read.
32  *
33  * Pixel input or output format is always AV_PIX_FMT_RGBA.
34  */
35 
36 #ifndef AVCODEC_TEXTUREDSP_H
37 #define AVCODEC_TEXTUREDSP_H
38 
39 #include <stddef.h>
40 #include <stdint.h>
41 
42 #define TEXTURE_BLOCK_W 4
43 #define TEXTURE_BLOCK_H 4
44 
45 typedef struct TextureDSPContext {
46  int (*dxt1_block) (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
47  int (*dxt1a_block) (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
48  int (*dxt2_block) (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
49  int (*dxt3_block) (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
50  int (*dxt4_block) (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
51  int (*dxt5_block) (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
52  int (*dxt5y_block) (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
53  int (*dxt5ys_block) (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
54  int (*rgtc1s_block) (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
55  int (*rgtc1u_block) (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
56  int (*rgtc1u_gray_block) (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
57  int (*rgtc1u_alpha_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
58  int (*rgtc2s_block) (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
59  int (*rgtc2u_block) (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
60  int (*dxn3dc_block) (uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
62 
65 
66 #endif /* AVCODEC_TEXTUREDSP_H */
stride
int stride
Definition: mace.c:144
TextureDSPContext::dxt1_block
int(* dxt1_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:46
TextureDSPContext::rgtc1u_alpha_block
int(* rgtc1u_alpha_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:57
TextureDSPContext::rgtc1u_gray_block
int(* rgtc1u_gray_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:56
TextureDSPContext::rgtc2s_block
int(* rgtc2s_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:58
TextureDSPContext::dxt2_block
int(* dxt2_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:48
TextureDSPContext::dxt5ys_block
int(* dxt5ys_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:53
TextureDSPContext
Definition: texturedsp.h:45
TextureDSPContext::rgtc1u_block
int(* rgtc1u_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:55
TextureDSPContext::dxt5_block
int(* dxt5_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:51
TextureDSPContext::dxt1a_block
int(* dxt1a_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:47
TextureDSPContext::dxn3dc_block
int(* dxn3dc_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:60
ff_texturedspenc_init
void ff_texturedspenc_init(TextureDSPContext *c)
Definition: texturedspenc.c:666
TextureDSPContext::rgtc2u_block
int(* rgtc2u_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:59
TextureDSPContext::dxt4_block
int(* dxt4_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:50
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
TextureDSPContext::dxt5y_block
int(* dxt5y_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:52
TextureDSPContext::dxt3_block
int(* dxt3_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:49
ff_texturedsp_init
void ff_texturedsp_init(TextureDSPContext *c)
Definition: texturedsp.c:637
block
The exact code depends on how similar the blocks are and how related they are to the block
Definition: filter_design.txt:207
int
int
Definition: ffmpeg_filter.c:153
TextureDSPContext::rgtc1s_block
int(* rgtc1s_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:54