libavfilter/drawutils.c

   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 <string.h>
  20
  21 #include "libavutil/avutil.h"
  22 #include "libavutil/colorspace.h"
  23 #include "libavutil/mem.h"
  24 #include "libavutil/pixdesc.h"
  25 #include "drawutils.h"
  26
  27 enum { RED = 0, GREEN, BLUE, ALPHA };
  28
  29 int ff_fill_line_with_color(uint8_t *line[4], int pixel_step[4], int w, uint8_t dst_color[4],
  30                             enum AVPixelFormat pix_fmt, uint8_t rgba_color[4],
  31                             int *is_packed_rgba, uint8_t rgba_map_ptr[4])
  32 {
  33     uint8_t rgba_map[4] = {0};
  34     int i;
  35     const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(pix_fmt);
  36     int hsub = pix_desc->log2_chroma_w;
  37
  38     *is_packed_rgba = 1;
  39     switch (pix_fmt) {
  40     case AV_PIX_FMT_ARGB:  rgba_map[ALPHA] = 0; rgba_map[RED  ] = 1; rgba_map[GREEN] = 2; rgba_map[BLUE ] = 3; break;
  41     case AV_PIX_FMT_ABGR:  rgba_map[ALPHA] = 0; rgba_map[BLUE ] = 1; rgba_map[GREEN] = 2; rgba_map[RED  ] = 3; break;
  42     case AV_PIX_FMT_RGBA:
  43     case AV_PIX_FMT_RGB24: rgba_map[RED  ] = 0; rgba_map[GREEN] = 1; rgba_map[BLUE ] = 2; rgba_map[ALPHA] = 3; break;
  44     case AV_PIX_FMT_BGRA:
  45     case AV_PIX_FMT_BGR24: rgba_map[BLUE ] = 0; rgba_map[GREEN] = 1; rgba_map[RED  ] = 2; rgba_map[ALPHA] = 3; break;
  46     default:
  47         *is_packed_rgba = 0;
  48     }
  49
  50     if (*is_packed_rgba) {
  51         pixel_step[0] = (av_get_bits_per_pixel(pix_desc))>>3;
  52         for (i = 0; i < 4; i++)
  53             dst_color[rgba_map[i]] = rgba_color[i];
  54
  55         line[0] = av_malloc(w * pixel_step[0]);
  56         for (i = 0; i < w; i++)
  57             memcpy(line[0] + i * pixel_step[0], dst_color, pixel_step[0]);
  58         if (rgba_map_ptr)
  59             memcpy(rgba_map_ptr, rgba_map, sizeof(rgba_map[0]) * 4);
  60     } else {
  61         int plane;
  62
  63         dst_color[0] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]);
  64         dst_color[1] = RGB_TO_U_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
  65         dst_color[2] = RGB_TO_V_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
  66         dst_color[3] = rgba_color[3];
  67
  68         for (plane = 0; plane < 4; plane++) {
  69             int line_size;
  70             int hsub1 = (plane == 1 || plane == 2) ? hsub : 0;
  71
  72             pixel_step[plane] = 1;
  73             line_size = (w >> hsub1) * pixel_step[plane];
  74             line[plane] = av_malloc(line_size);
  75             memset(line[plane], dst_color[plane], line_size);
  76         }
  77     }
  78
  79     return 0;
  80 }
  81
  82 void ff_draw_rectangle(uint8_t *dst[4], int dst_linesize[4],
  83                        uint8_t *src[4], int pixelstep[4],
  84                        int hsub, int vsub, int x, int y, int w, int h)
  85 {
  86     int i, plane;
  87     uint8_t *p;
  88
  89     for (plane = 0; plane < 4 && dst[plane]; plane++) {
  90         int hsub1 = plane == 1 || plane == 2 ? hsub : 0;
  91         int vsub1 = plane == 1 || plane == 2 ? vsub : 0;
  92
  93         p = dst[plane] + (y >> vsub1) * dst_linesize[plane];
  94         for (i = 0; i < (h >> vsub1); i++) {
  95             memcpy(p + (x >> hsub1) * pixelstep[plane],
  96                    src[plane], (w >> hsub1) * pixelstep[plane]);
  97             p += dst_linesize[plane];
  98         }
  99     }
 100 }
 101
 102 void ff_copy_rectangle(uint8_t *dst[4], int dst_linesize[4],
 103                        uint8_t *src[4], int src_linesize[4], int pixelstep[4],
 104                        int hsub, int vsub, int x, int y, int y2, int w, int h)
 105 {
 106     int i, plane;
 107     uint8_t *p;
 108
 109     for (plane = 0; plane < 4 && dst[plane]; plane++) {
 110         int hsub1 = plane == 1 || plane == 2 ? hsub : 0;
 111         int vsub1 = plane == 1 || plane == 2 ? vsub : 0;
 112
 113         p = dst[plane] + (y >> vsub1) * dst_linesize[plane];
 114         for (i = 0; i < (h >> vsub1); i++) {
 115             memcpy(p + (x >> hsub1) * pixelstep[plane],
 116                    src[plane] + src_linesize[plane]*(i+(y2>>vsub1)), (w >> hsub1) * pixelstep[plane]);
 117             p += dst_linesize[plane];
 118         }
 119     }
 120 }