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 */
int(* dxt5_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:51
int(* rgtc1u_alpha_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:57
The exact code depends on how similar the blocks are and how related they are to the block
uint8_t
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
int(* dxt5y_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:52
int(* dxt3_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:49
int(* rgtc2s_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:58
int(* dxt5ys_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:53
int(* rgtc1u_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:55
int(* dxt1a_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:47
int(* dxt2_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:48
void ff_texturedsp_init(TextureDSPContext *c)
Definition: texturedsp.c:637
int(* dxt1_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:46
void ff_texturedspenc_init(TextureDSPContext *c)
int(* dxt4_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:50
int(* rgtc1s_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:54
int
int(* rgtc2u_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:59
#define stride
int(* rgtc1u_gray_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:56
int(* dxn3dc_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:60