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improved unstable margins / preserve opacity

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Kyle
2021-10-24 13:23:52 -07:00
parent 6efb64f8f2
commit f2f5ecf8b5
6 changed files with 25 additions and 10 deletions
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8
js/creator-23.js
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@@ -337,9 +337,11 @@ function drawFrames() {
//manually blends colors, basing blending-alpha on the masks and desired draw-opacity, but preserving alpha
for (var i = 0; i < existingPixels.length; i += 4) {
const functionalAlpha = maskPixels[i + 3] * functionalAlphaMultiplier //functional alpha = alpha ignoring source image
existingPixels[ i ] = existingPixels[ i ] * (1 - functionalAlpha) + newPixels[ i ] * functionalAlpha; //RED
existingPixels[i + 1] = existingPixels[i + 1] * (1 - functionalAlpha) + newPixels[i + 1] * functionalAlpha; //GREEN
existingPixels[i + 2] = existingPixels[i + 2] * (1 - functionalAlpha) + newPixels[i + 2] * functionalAlpha; //BLUE
if (newPixels[i + 3] > 0) { //Only blend if the new image has alpha
existingPixels[ i ] = existingPixels[ i ] * (1 - functionalAlpha) + newPixels[ i ] * functionalAlpha; //RED
existingPixels[i + 1] = existingPixels[i + 1] * (1 - functionalAlpha) + newPixels[i + 1] * functionalAlpha; //GREEN
existingPixels[i + 2] = existingPixels[i + 2] * (1 - functionalAlpha) + newPixels[i + 2] * functionalAlpha; //BLUE
}
}
frameContext.putImageData(existingData, 0, 0);
} else {