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image: fix conversion on different endianness (FS#504) 

Signed-off-by: Julien Danjou <julien@danjou.info>
This commit is contained in:
Julien Danjou 2009-04-27 12:09:04 +02:00
parent b780be7578
commit 14b090e566
1 changed files with 9 additions and 0 deletions
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9
image.c
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@ -100,12 +100,21 @@ image_compute(image_t *image)
for(i = 0; i < size; i++, dataimg += 4) for(i = 0; i < size; i++, dataimg += 4)
{ {
#if AWESOME_IS_BIG_ENDIAN
dataimg[0] = (data[i] >> 24) & 0xff; /* A */
/* cairo wants pre-multiplied alpha */
alpha = dataimg[0] / 255.0;
dataimg[1] = ((data[i] >> 16) & 0xff) * alpha; /* R */
dataimg[2] = ((data[i] >> 8) & 0xff) * alpha; /* G */
dataimg[3] = (data[i] & 0xff) * alpha; /* B */
#else
dataimg[3] = (data[i] >> 24) & 0xff; /* A */ dataimg[3] = (data[i] >> 24) & 0xff; /* A */
/* cairo wants pre-multiplied alpha */ /* cairo wants pre-multiplied alpha */
alpha = dataimg[3] / 255.0; alpha = dataimg[3] / 255.0;
dataimg[2] = ((data[i] >> 16) & 0xff) * alpha; /* R */ dataimg[2] = ((data[i] >> 16) & 0xff) * alpha; /* R */
dataimg[1] = ((data[i] >> 8) & 0xff) * alpha; /* G */ dataimg[1] = ((data[i] >> 8) & 0xff) * alpha; /* G */
dataimg[0] = (data[i] & 0xff) * alpha; /* B */ dataimg[0] = (data[i] & 0xff) * alpha; /* B */
#endif
} }
} }