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Pre-calculate opacity value.

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This commit is contained in:
Jürg Lehni 2011-06-01 14:00:02 +01:00
parent a1d996df05
commit 4a9f0d726f
1 changed files with 2 additions and 1 deletions
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3
src/util/BlendMode.js
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@ -53,6 +53,7 @@ var BlendMode = {
dst = dstD.data,
min = Math.min,
sA, dA, dA2, sRA, sGA, sBA, dRA, dGA, dBA, demultiply;
opacity = opacity / 255,
// TODO: Some blend modes seem broken at the moment, e.g.
// dodge, burn
@ -162,7 +163,7 @@ var BlendMode = {
var process = modes[blendMode] || modes.unsupported;
for (var i = 0, l = dst.length; i < l; i += 4) {
sA = src[i + 3] / 255 * opacity;
sA = src[i + 3] * opacity;
dA = dst[i + 3] / 255;
dA2 = sA + dA - sA * dA;
sRA = src[i] / 255 * sA;