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evas/common: improve evas_common_convert_argb_unpremul() computation. 

prev logic increased the alpha channel by 1 so the unpremul resulted in the color got too diff from the origin.

We can't avoid losing the rest values while dividing values in premul/unpremul()
but this will recover the value better closed to origin value.
This commit is contained in:
ChunEon Park 2015-04-06 21:58:07 +09:00
parent f419555cd8
commit 7a6eb2ea42
1 changed files with 3 additions and 3 deletions
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6
src/lib/evas/common/evas_convert_color.c
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@ -52,18 +52,18 @@ evas_common_convert_argb_unpremul(DATA32 *data, unsigned int len)
while (data < de)
{
DATA32 a = (*data >> 24) + 1;
DATA32 a = (*data >> 24);
if (p_val == *data) *data = p_res;
else
{
p_val = *data;
if ((a > 1) && (a < 256))
if ((a > 0) && (a < 255))
*data = ARGB_JOIN(a,
(R_VAL(data) * 255) / a,
(G_VAL(data) * 255) / a,
(B_VAL(data) * 255) / a);
else if (a == 1)
else if (a == 0)
*data = 0x00000000;
p_res = *data;
}