From 95b096245b52f06f9036f219146835db3f3e8d7d Mon Sep 17 00:00:00 2001 From: Gustavo Sverzut Barbieri Date: Mon, 30 Oct 2006 19:17:51 +0000 Subject: [PATCH] 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 --- vhook/drawtext.c | 14 +++++++++----- 1 file 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; \ + 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]; \