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Optimise blend mode loop by pre-calculating divisions.

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This commit is contained in:
Jürg Lehni 2011-06-01 14:00:50 +01:00
parent 4a9f0d726f
commit b9739aa26a
1 changed files with 9 additions and 7 deletions
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16
src/util/BlendMode.js
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@ -52,8 +52,8 @@ var BlendMode = {
src = srcD.data,
dst = dstD.data,
min = Math.min,
sA, dA, dA2, sRA, sGA, sBA, dRA, dGA, dBA, demultiply;
opacity = opacity / 255,
sA, dA, sAM, dAM, dA2, sRA, sGA, sBA, dRA, dGA, dBA, demultiply;
// TODO: Some blend modes seem broken at the moment, e.g.
// dodge, burn
@ -166,12 +166,14 @@ var BlendMode = {
sA = src[i + 3] * opacity;
dA = dst[i + 3] / 255;
dA2 = sA + dA - sA * dA;
sRA = src[i] / 255 * sA;
dRA = dst[i] / 255 * dA;
sGA = src[i + 1] / 255 * sA;
dGA = dst[i + 1] / 255 * dA;
sBA = src[i + 2] / 255 * sA;
dBA = dst[i + 2] / 255 * dA;
sAM = sA / 255;
dAM = dA / 255;
sRA = src[i] * sAM;
dRA = dst[i] * dAM;
sGA = src[i + 1] * sAM;
dGA = dst[i + 1] * dAM;
sBA = src[i + 2] * sAM;
dBA = dst[i + 2] * dAM;
demultiply = 255 / dA2;
process(i);
dst[i + 3] = dA2 * 255;