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Optimise code for normal and multiply blend modes by precalculating values.

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This commit is contained in:
Jürg Lehni 2011-06-01 17:10:40 +01:00
parent 8bbb3744fe
commit 3850e4a53b
1 changed files with 8 additions and 6 deletions
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14
src/util/BlendMode.js
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@ -53,15 +53,17 @@ var BlendMode = {
// TODO: Some blend modes seem broken at the moment, e.g. dodge, burn
var modes = {
normal: function(i) {
dst[i] = (sRA + dRA - dRA * sA) * rM;
dst[i + 1] = (sGA + dGA - dGA * sA) * rM;
dst[i + 2] = (sBA + dBA - dBA * sA) * rM;
var sA1 = 1 - sA;
dst[i] = (sRA + dRA * sA1) * rM;
dst[i + 1] = (sGA + dGA * sA1) * rM;
dst[i + 2] = (sBA + dRA * sA1) * rM;
},
multiply: function(i) {
dst[i] = (sRA * dRA + sRA * (1 - dA) + dRA * (1 - sA)) * rM;
dst[i + 1] = (sGA * dGA + sGA * (1 - dA) + dGA * (1 - sA)) * rM;
dst[i + 2] = (sBA * dBA + sBA * (1 - dA) + dBA * (1 - sA)) * rM;
var sA1 = 1 - sA, dA1 = 1 - dA;
dst[i] = (sRA * dRA + sRA * dA1 + dRA * sA1) * rM;
dst[i + 1] = (sGA * dGA + sGA * dA1 + dGA * sA1) * rM;
dst[i + 2] = (sBA * dBA + sBA * dA1 + dBA * sA1) * rM;
},
screen: function(i) {