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backport fix for gdImageCopyResampled created noisy image with alpha

master
Pierre Joye 2013-04-05 08:08:45 +02:00
parent 0f0894a7dd
commit d7ce3d3181
1 changed files with 9 additions and 0 deletions
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9
src/gd.c
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@ -2689,6 +2689,15 @@ BGD_DECLARE(void) gdImageCopyResampled (gdImagePtr dst,
green /= spixels;
blue /= spixels;
alpha /= spixels;
alpha += 0.5;
}
if ( alpha_sum != 0.0f) {
if( contrib_sum != 0.0f) {
alpha_sum /= contrib_sum;
}
red /= alpha_sum;
green /= alpha_sum;
blue /= alpha_sum;
}
/* Clamping to allow for rounding errors above */
if (red > 255.0) {