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speedup La -> LA conversion in most cases

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This commit is contained in:
homm 2016-05-26 15:22:01 +03:00
parent d1272b9b8a
commit b56d8f3f1f
1 changed files with 4 additions and 4 deletions
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6
libImaging/Convert.c
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@ -140,10 +140,10 @@ la2lA(UINT8* out, const UINT8* in, int xsize)
unsigned int alpha, pixel; unsigned int alpha, pixel;
for (x = 0; x < xsize; x++, in+=4) { for (x = 0; x < xsize; x++, in+=4) {
alpha = in[3]; alpha = in[3];
if (alpha) { if (alpha == 255 || alpha == 0) {
pixel = CLIP((255 * in[0]) / alpha);
} else {
pixel = in[0]; pixel = in[0];
} else {
pixel = CLIP((255 * in[0]) / alpha);
} }
*out++ = (UINT8) pixel; *out++ = (UINT8) pixel;
*out++ = (UINT8) pixel; *out++ = (UINT8) pixel;