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Simplify and comment spudec bilinear scaling code

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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@28223 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
reimar 2009-01-01 11:33:46 +00:00
parent 0b806e4798
commit 2641f96246
1 changed files with 4 additions and 3 deletions
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7
spudec.c
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@ -737,9 +737,10 @@ static void scale_image(int x, int y, scale_pixel* table_x, scale_pixel* table_y
spu->scaled_image[scaled] = (color[0] * scale[0] + color[1] * scale[1] + color[2] * scale[2] + color[3] * scale[3])>>24;
spu->scaled_aimage[scaled] = (scale[0] + scale[1] + scale[2] + scale[3]) >> 16;
if (spu->scaled_aimage[scaled]){
spu->scaled_aimage[scaled] = 256 - spu->scaled_aimage[scaled];
if(spu->scaled_aimage[scaled] + spu->scaled_image[scaled] > 255)
spu->scaled_image[scaled] = 256 - spu->scaled_aimage[scaled];
// ensure that MPlayer's simplified alpha-blending can not overflow
spu->scaled_image[scaled] = FFMIN(spu->scaled_image[scaled], spu->scaled_aimage[scaled]);
// convert to MPlayer-style alpha
spu->scaled_aimage[scaled] = -spu->scaled_aimage[scaled];
}
}