drawutils.c
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1 /*
2  * This file is part of Libav.
3  *
4  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include "libavutil/avutil.h"
20 #include "libavutil/colorspace.h"
21 #include "libavutil/pixdesc.h"
22 #include "drawutils.h"
23 
24 enum { RED = 0, GREEN, BLUE, ALPHA };
25 
26 int ff_fill_line_with_color(uint8_t *line[4], int pixel_step[4], int w, uint8_t dst_color[4],
27  enum PixelFormat pix_fmt, uint8_t rgba_color[4],
28  int *is_packed_rgba, uint8_t rgba_map_ptr[4])
29 {
30  uint8_t rgba_map[4] = {0};
31  int i;
33  int hsub = pix_desc->log2_chroma_w;
34 
35  *is_packed_rgba = 1;
36  switch (pix_fmt) {
37  case PIX_FMT_ARGB: rgba_map[ALPHA] = 0; rgba_map[RED ] = 1; rgba_map[GREEN] = 2; rgba_map[BLUE ] = 3; break;
38  case PIX_FMT_ABGR: rgba_map[ALPHA] = 0; rgba_map[BLUE ] = 1; rgba_map[GREEN] = 2; rgba_map[RED ] = 3; break;
39  case PIX_FMT_RGBA:
40  case PIX_FMT_RGB24: rgba_map[RED ] = 0; rgba_map[GREEN] = 1; rgba_map[BLUE ] = 2; rgba_map[ALPHA] = 3; break;
41  case PIX_FMT_BGRA:
42  case PIX_FMT_BGR24: rgba_map[BLUE ] = 0; rgba_map[GREEN] = 1; rgba_map[RED ] = 2; rgba_map[ALPHA] = 3; break;
43  default:
44  *is_packed_rgba = 0;
45  }
46 
47  if (*is_packed_rgba) {
48  pixel_step[0] = (av_get_bits_per_pixel(pix_desc))>>3;
49  for (i = 0; i < 4; i++)
50  dst_color[rgba_map[i]] = rgba_color[i];
51 
52  line[0] = av_malloc(w * pixel_step[0]);
53  for (i = 0; i < w; i++)
54  memcpy(line[0] + i * pixel_step[0], dst_color, pixel_step[0]);
55  if (rgba_map_ptr)
56  memcpy(rgba_map_ptr, rgba_map, sizeof(rgba_map[0]) * 4);
57  } else {
58  int plane;
59 
60  dst_color[0] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]);
61  dst_color[1] = RGB_TO_U_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
62  dst_color[2] = RGB_TO_V_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
63  dst_color[3] = rgba_color[3];
64 
65  for (plane = 0; plane < 4; plane++) {
66  int line_size;
67  int hsub1 = (plane == 1 || plane == 2) ? hsub : 0;
68 
69  pixel_step[plane] = 1;
70  line_size = (w >> hsub1) * pixel_step[plane];
71  line[plane] = av_malloc(line_size);
72  memset(line[plane], dst_color[plane], line_size);
73  }
74  }
75 
76  return 0;
77 }
78 
79 void ff_draw_rectangle(uint8_t *dst[4], int dst_linesize[4],
80  uint8_t *src[4], int pixelstep[4],
81  int hsub, int vsub, int x, int y, int w, int h)
82 {
83  int i, plane;
84  uint8_t *p;
85 
86  for (plane = 0; plane < 4 && dst[plane]; plane++) {
87  int hsub1 = plane == 1 || plane == 2 ? hsub : 0;
88  int vsub1 = plane == 1 || plane == 2 ? vsub : 0;
89 
90  p = dst[plane] + (y >> vsub1) * dst_linesize[plane];
91  for (i = 0; i < (h >> vsub1); i++) {
92  memcpy(p + (x >> hsub1) * pixelstep[plane],
93  src[plane], (w >> hsub1) * pixelstep[plane]);
94  p += dst_linesize[plane];
95  }
96  }
97 }
98 
99 void ff_copy_rectangle(uint8_t *dst[4], int dst_linesize[4],
100  uint8_t *src[4], int src_linesize[4], int pixelstep[4],
101  int hsub, int vsub, int x, int y, int y2, int w, int h)
102 {
103  int i, plane;
104  uint8_t *p;
105 
106  for (plane = 0; plane < 4 && dst[plane]; plane++) {
107  int hsub1 = plane == 1 || plane == 2 ? hsub : 0;
108  int vsub1 = plane == 1 || plane == 2 ? vsub : 0;
109 
110  p = dst[plane] + (y >> vsub1) * dst_linesize[plane];
111  for (i = 0; i < (h >> vsub1); i++) {
112  memcpy(p + (x >> hsub1) * pixelstep[plane],
113  src[plane] + src_linesize[plane]*(i+(y2>>vsub1)), (w >> hsub1) * pixelstep[plane]);
114  p += dst_linesize[plane];
115  }
116  }
117 }