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WASM: unpremultiplyBuffer fixes (#999)

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Michal Maciola 2021-11-05 10:32:41 +01:00 • committed by GitHub
parent 45f521618c
commit 545d3ead67
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1 changed files with 7 additions and 3 deletions
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10
src/wasm/thorvgwasm.cpp
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@ -225,16 +225,20 @@ private:
for (uint32_t x = 0; x < mWidth; ++x) {
uint8_t a = buffer[x] >> 24;
if (a == 255) {
continue;
uint8_t b = (buffer[x] & 0xff);
uint8_t r = ((buffer[x] >> 16) & 0xff);
buffer[x] = (buffer[x] & 0xff00ff00) | (b << 16) | (r);
} else if (a == 0) {
buffer[x] = 0x00ffffff;
} else {
uint16_t b = ((buffer[x] << 8) & 0xff00) / a;
uint16_t g = ((buffer[x]) & 0xff00) / a;
uint16_t r = ((buffer[x] >> 8) & 0xff00) / a;
if (b > 0xff) r = 0xff;
if (b > 0xff) b = 0xff;
if (g > 0xff) g = 0xff;
if (r > 0xff) b = 0xff;
if (r > 0xff) r = 0xff;
buffer[x] = (a << 24) | (b << 16) | (g << 8) | (r);
}
}