diff options
Diffstat (limited to 'spudec.c')
| -rw-r--r-- | spudec.c | 7 |
1 files changed, 4 insertions, 3 deletions
@@ -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]; } } |