Libav 0.7.1
libavfilter/drawutils.c
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00001 /*
00002  * This file is part of Libav.
00003  *
00004  * Libav is free software; you can redistribute it and/or
00005  * modify it under the terms of the GNU Lesser General Public
00006  * License as published by the Free Software Foundation; either
00007  * version 2.1 of the License, or (at your option) any later version.
00008  *
00009  * Libav is distributed in the hope that it will be useful,
00010  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012  * Lesser General Public License for more details.
00013  *
00014  * You should have received a copy of the GNU Lesser General Public
00015  * License along with Libav; if not, write to the Free Software
00016  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00017  */
00018 
00019 #include "libavutil/avutil.h"
00020 #include "libavutil/colorspace.h"
00021 #include "libavutil/pixdesc.h"
00022 #include "drawutils.h"
00023 
00024 enum { RED = 0, GREEN, BLUE, ALPHA };
00025 
00026 int ff_fill_line_with_color(uint8_t *line[4], int pixel_step[4], int w, uint8_t dst_color[4],
00027                             enum PixelFormat pix_fmt, uint8_t rgba_color[4],
00028                             int *is_packed_rgba, uint8_t rgba_map_ptr[4])
00029 {
00030     uint8_t rgba_map[4] = {0};
00031     int i;
00032     const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[pix_fmt];
00033     int hsub = pix_desc->log2_chroma_w;
00034 
00035     *is_packed_rgba = 1;
00036     switch (pix_fmt) {
00037     case PIX_FMT_ARGB:  rgba_map[ALPHA] = 0; rgba_map[RED  ] = 1; rgba_map[GREEN] = 2; rgba_map[BLUE ] = 3; break;
00038     case PIX_FMT_ABGR:  rgba_map[ALPHA] = 0; rgba_map[BLUE ] = 1; rgba_map[GREEN] = 2; rgba_map[RED  ] = 3; break;
00039     case PIX_FMT_RGBA:
00040     case PIX_FMT_RGB24: rgba_map[RED  ] = 0; rgba_map[GREEN] = 1; rgba_map[BLUE ] = 2; rgba_map[ALPHA] = 3; break;
00041     case PIX_FMT_BGRA:
00042     case PIX_FMT_BGR24: rgba_map[BLUE ] = 0; rgba_map[GREEN] = 1; rgba_map[RED  ] = 2; rgba_map[ALPHA] = 3; break;
00043     default:
00044         *is_packed_rgba = 0;
00045     }
00046 
00047     if (*is_packed_rgba) {
00048         pixel_step[0] = (av_get_bits_per_pixel(pix_desc))>>3;
00049         for (i = 0; i < 4; i++)
00050             dst_color[rgba_map[i]] = rgba_color[i];
00051 
00052         line[0] = av_malloc(w * pixel_step[0]);
00053         for (i = 0; i < w; i++)
00054             memcpy(line[0] + i * pixel_step[0], dst_color, pixel_step[0]);
00055         if (rgba_map_ptr)
00056             memcpy(rgba_map_ptr, rgba_map, sizeof(rgba_map[0]) * 4);
00057     } else {
00058         int plane;
00059 
00060         dst_color[0] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]);
00061         dst_color[1] = RGB_TO_U_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
00062         dst_color[2] = RGB_TO_V_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
00063         dst_color[3] = rgba_color[3];
00064 
00065         for (plane = 0; plane < 4; plane++) {
00066             int line_size;
00067             int hsub1 = (plane == 1 || plane == 2) ? hsub : 0;
00068 
00069             pixel_step[plane] = 1;
00070             line_size = (w >> hsub1) * pixel_step[plane];
00071             line[plane] = av_malloc(line_size);
00072             memset(line[plane], dst_color[plane], line_size);
00073         }
00074     }
00075 
00076     return 0;
00077 }
00078 
00079 void ff_draw_rectangle(uint8_t *dst[4], int dst_linesize[4],
00080                        uint8_t *src[4], int pixelstep[4],
00081                        int hsub, int vsub, int x, int y, int w, int h)
00082 {
00083     int i, plane;
00084     uint8_t *p;
00085 
00086     for (plane = 0; plane < 4 && dst[plane]; plane++) {
00087         int hsub1 = plane == 1 || plane == 2 ? hsub : 0;
00088         int vsub1 = plane == 1 || plane == 2 ? vsub : 0;
00089 
00090         p = dst[plane] + (y >> vsub1) * dst_linesize[plane];
00091         for (i = 0; i < (h >> vsub1); i++) {
00092             memcpy(p + (x >> hsub1) * pixelstep[plane],
00093                    src[plane], (w >> hsub1) * pixelstep[plane]);
00094             p += dst_linesize[plane];
00095         }
00096     }
00097 }
00098 
00099 void ff_copy_rectangle(uint8_t *dst[4], int dst_linesize[4],
00100                        uint8_t *src[4], int src_linesize[4], int pixelstep[4],
00101                        int hsub, int vsub, int x, int y, int y2, int w, int h)
00102 {
00103     int i, plane;
00104     uint8_t *p;
00105 
00106     for (plane = 0; plane < 4 && dst[plane]; plane++) {
00107         int hsub1 = plane == 1 || plane == 2 ? hsub : 0;
00108         int vsub1 = plane == 1 || plane == 2 ? vsub : 0;
00109 
00110         p = dst[plane] + (y >> vsub1) * dst_linesize[plane];
00111         for (i = 0; i < (h >> vsub1); i++) {
00112             memcpy(p + (x >> hsub1) * pixelstep[plane],
00113                    src[plane] + src_linesize[plane]*(i+(y2>>vsub1)), (w >> hsub1) * pixelstep[plane]);
00114             p += dst_linesize[plane];
00115         }
00116     }
00117 }