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adding RGBa->RGBA conversion

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wiredfool 2013-10-04 13:24:47 -07:00
parent 7077cd18af
commit b9f94b7632
1 changed files with 27 additions and 0 deletions
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27
libImaging/Convert.c
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@ -289,6 +289,31 @@ rgba2rgba(UINT8* out, const UINT8* in, int xsize)
}
}
/* RGBa -> RGBA conversion to remove premultiplication
Needed for correct transforms/resizing on RGBA images */
static void
rgba2rgbA(UINT8* out, const UINT8* in, int xsize)
{
int x;
unsigned int alpha;
for (x = 0; x < xsize; x++, in+=4) {
alpha = in[3];
if (alpha) {
*out++ = CLIP((255 * in[0]) / alpha);
*out++ = CLIP((255 * in[1]) / alpha);
*out++ = CLIP((255 * in[2]) / alpha);
} else {
*out++ = in[0];
*out++ = in[1];
*out++ = in[2];
}
*out++ = in[3];
}
}
/* ---------------- */
/* CMYK conversions */
/* ---------------- */
@ -619,6 +644,8 @@ static struct {
{ "RGBA", "CMYK", rgb2cmyk },
{ "RGBA", "YCbCr", ImagingConvertRGB2YCbCr },
{ "RGBa", "RGBA", rgba2rgbA },
{ "RGBX", "1", rgb2bit },
{ "RGBX", "L", rgb2l },
{ "RGBA", "I", rgb2i },