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image-loader: Fix undefined left shift in premultiply_data

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../shared/image-loader.c:184:14: runtime error: left shift of 255 by 24 places cannot be represented in type 'int'

Store each channel in a uint32_t instead of a byte so we compute the shift over
an unsigned type.
This commit is contained in:
Adam Jackson 2019-10-16 16:06:06 -04:00
parent 3c3f3b1cc3
commit ad0fe6b6f9
1 changed files with 4 additions and 4 deletions
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8
shared/image-loader.c
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@ -166,15 +166,15 @@ premultiply_data(png_structp png,
png_bytep p;
for (i = 0, p = data; i < row_info->rowbytes; i += 4, p += 4) {
png_byte alpha = p[3];
uint32_t alpha = p[3];
uint32_t w;
if (alpha == 0) {
w = 0;
} else {
png_byte red = p[0];
png_byte green = p[1];
png_byte blue = p[2];
uint32_t red = p[0];
uint32_t green = p[1];
uint32_t blue = p[2];
if (alpha != 0xff) {
red = multiply_alpha(alpha, red);