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/PHP-7.1/ext/gd/libgd/
H A Dgd.c2497 double alpha_factor, alpha_sum = 0.0, contrib_sum = 0.0; in gdImageCopyResampled() local
2538 alpha_sum += alpha_factor; in gdImageCopyResampled()
2557 if ( alpha_sum != 0.0f) { in gdImageCopyResampled()
2559 alpha_sum /= contrib_sum; in gdImageCopyResampled()
2561 red /= alpha_sum; in gdImageCopyResampled()
2562 green /= alpha_sum; in gdImageCopyResampled()
2563 blue /= alpha_sum; in gdImageCopyResampled()

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