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Use fixed point in color conversion.

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patch by Gustavo Sverzut Barbieri, barbieri gmail com

Originally committed as revision 6842 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Gustavo Sverzut Barbieri 2006-10-30 19:17:51 +00:00 committed by Diego Biurrun
parent e389399289
commit 95b096245b
1 changed files with 9 additions and 5 deletions
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14
vhook/drawtext.c
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@ -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]; \