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Code Issues Releases Wiki Activity

Optimization in AlphaBlend()

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This commit is contained in:
Klaus Schmidinger 2011-02-20 21:35:48 +01:00
parent 76d9240395
commit e145ee45e2
1 changed files with 3 additions and 5 deletions
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4
osd.c
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@ -4,7 +4,7 @@
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: osd.c 2.12 2011/02/20 14:48:01 kls Exp $
* $Id: osd.c 2.13 2011/02/20 21:35:48 kls Exp $
*/
#include "osd.h"
@ -72,10 +72,8 @@ cInitAlphaLut initAlphaLut;
tColor AlphaBlend(tColor ColorFg, tColor ColorBg, tColor AlphaLayer)
{
tColor Alpha = (ColorFg & 0xFF000000) >> 24;
if (AlphaLayer < ALPHA_OPAQUE) {
Alpha *= AlphaLayer;
Alpha = ((Alpha + ((Alpha >> 8) & 0x000000FF) + 0x00000080) >> 8) & 0x000000FF;
}
uint16_t *lut = &AlphaLut[Alpha][(ColorBg & 0xFF000000) >> 24][0];
return (tColor)((lut[3] << 24)
| (((((ColorFg & 0x00FF0000) >> 16) * lut[0] + ((ColorBg & 0x00FF0000) >> 16) * lut[1]) << 8) & 0x00FF0000)