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huffyuvdsp.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include <stdint.h>
20 
21 #include "config.h"
22 #include "libavutil/attributes.h"
23 #include "mathops.h"
24 #include "huffyuvdsp.h"
25 
26 // 0x7f7f7f7f or 0x7f7f7f7f7f7f7f7f or whatever, depending on the cpu's native arithmetic size
27 #define pb_7f (~0UL / 255 * 0x7f)
28 #define pb_80 (~0UL / 255 * 0x80)
29 
30 static void add_bytes_c(uint8_t *dst, uint8_t *src, intptr_t w)
31 {
32  long i;
33 
34  for (i = 0; i <= w - (int) sizeof(long); i += sizeof(long)) {
35  long a = *(long *) (src + i);
36  long b = *(long *) (dst + i);
37  *(long *) (dst + i) = ((a & pb_7f) + (b & pb_7f)) ^ ((a ^ b) & pb_80);
38  }
39  for (; i < w; i++)
40  dst[i + 0] += src[i + 0];
41 }
42 
43 static void add_hfyu_median_pred_c(uint8_t *dst, const uint8_t *src1,
44  const uint8_t *diff, intptr_t w,
45  int *left, int *left_top)
46 {
47  int i;
48  uint8_t l, lt;
49 
50  l = *left;
51  lt = *left_top;
52 
53  for (i = 0; i < w; i++) {
54  l = mid_pred(l, src1[i], (l + src1[i] - lt) & 0xFF) + diff[i];
55  lt = src1[i];
56  dst[i] = l;
57  }
58 
59  *left = l;
60  *left_top = lt;
61 }
62 
63 static int add_hfyu_left_pred_c(uint8_t *dst, const uint8_t *src, intptr_t w,
64  int acc)
65 {
66  int i;
67 
68  for (i = 0; i < w - 1; i++) {
69  acc += src[i];
70  dst[i] = acc;
71  i++;
72  acc += src[i];
73  dst[i] = acc;
74  }
75 
76  for (; i < w; i++) {
77  acc += src[i];
78  dst[i] = acc;
79  }
80 
81  return acc;
82 }
83 
84 static void add_hfyu_left_pred_bgr32_c(uint8_t *dst, const uint8_t *src,
85  intptr_t w, uint8_t *left)
86 {
87  int i;
88  uint8_t r = left[R], g = left[G], b = left[B], a = left[A];
89 
90  for (i = 0; i < w; i++) {
91  b += src[4 * i + B];
92  g += src[4 * i + G];
93  r += src[4 * i + R];
94  a += src[4 * i + A];
95 
96  dst[4 * i + B] = b;
97  dst[4 * i + G] = g;
98  dst[4 * i + R] = r;
99  dst[4 * i + A] = a;
100  }
101 
102  left[B] = b;
103  left[G] = g;
104  left[R] = r;
105  left[A] = a;
106 }
107 
109 {
110  c->add_bytes = add_bytes_c;
114 
115  if (ARCH_X86)
117 }