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| author | Gustavo Sverzut Barbieri <barbieri@gmail.com> | 2006-10-30 19:17:51 +0000 |
|---|---|---|
| committer | Diego Biurrun <diego@biurrun.de> | 2006-10-30 19:17:51 +0000 |
| commit | 95b096245b52f06f9036f219146835db3f3e8d7d (patch) | |
| tree | 8b732c65903e45dfc5da1abd27f6baf933319a43 | |
| parent | e389399289c19a754531d851bbdd97ac0e1f0130 (diff) | |
| download | ffmpeg-95b096245b52f06f9036f219146835db3f3e8d7d.tar.gz | |
Use fixed point in color conversion.
patch by Gustavo Sverzut Barbieri, barbieri gmail com
Originally committed as revision 6842 to svn://svn.ffmpeg.org/ffmpeg/trunk
| -rw-r--r-- | vhook/drawtext.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/vhook/drawtext.c b/vhook/drawtext.c index 65d7bd6776..e0005950e4 100644 --- a/vhook/drawtext.c +++ b/vhook/drawtext.c @@ -61,11 +61,15 @@ #include FT_FREETYPE_H #include FT_GLYPH_H -#define RGB_TO_YUV(rgb_color, yuv_color) { \ - yuv_color[0] = ( 0.257 * rgb_color[0]) + (0.504 * rgb_color[1]) + (0.098 * rgb_color[2]) + 16; \ - yuv_color[2] = ( 0.439 * rgb_color[0]) - (0.368 * rgb_color[1]) - (0.071 * rgb_color[2]) + 128; \ - yuv_color[1] = (-0.148 * rgb_color[0]) - (0.291 * rgb_color[1]) + (0.439 * rgb_color[2]) + 128; \ -} +#define SCALEBITS 10 +#define ONE_HALF (1 << (SCALEBITS - 1)) +#define FIX(x) ((int) ((x) * (1<<SCALEBITS) + 0.5)) + +#define RGB_TO_YUV(rgb_color, yuv_color) do { \ + yuv_color[0] = (FIX(0.29900) * rgb_color[0] + FIX(0.58700) * rgb_color[1] + FIX(0.11400) * rgb_color[2] + ONE_HALF) >> SCALEBITS; \ + yuv_color[2] = ((FIX(0.50000) * rgb_color[0] - FIX(0.41869) * rgb_color[1] - FIX(0.08131) * rgb_color[2] + ONE_HALF - 1) >> SCALEBITS) + 128; \ + yuv_color[1] = ((- FIX(0.16874) * rgb_color[0] - FIX(0.33126) * rgb_color[1] + FIX(0.50000) * rgb_color[2] + ONE_HALF - 1) >> SCALEBITS) + 128; \ +} while (0) #define COPY_3(dst,src) { \ dst[0]=src[0]; \ |