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Clean up blend-mode code a bit.

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This commit is contained in:
Jürg Lehni 2013-06-18 11:26:58 -07:00
parent deebd15f05
commit a2cc7e11b3
1 changed files with 6 additions and 8 deletions
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14
src/canvas/BlendMode.js
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@ -234,7 +234,10 @@ var BlendMode = new function() {
}, {});
CanvasProvider.release(ctx);
this.process = function(blendMode, srcContext, dstContext, alpha, offset) {
this.process = function(blendMode, srcContext, dstContext, opacity, offset) {
var process = modes[blendMode];
if (!process)
return;
var srcCanvas = srcContext.canvas;
// Use native blend-modes if supported, and fall back to emulation.
if (this.nativeModes[blendMode]) {
@ -248,11 +251,6 @@ var BlendMode = new function() {
dst = dstData.data,
src = srcContext.getImageData(0, 0,
srcCanvas.width, srcCanvas.height).data;
var process = modes[blendMode];
if (!process)
return;
for (var i = 0, l = dst.length; i < l; i += 4) {
sr = src[i];
br = dst[i];
@ -263,12 +261,12 @@ var BlendMode = new function() {
sa = src[i + 3];
ba = dst[i + 3];
process();
var a1 = sa * alpha / 255,
var a1 = sa * opacity / 255,
a2 = 1 - a1;
dst[i] = a1 * dr + a2 * br;
dst[i + 1] = a1 * dg + a2 * bg;
dst[i + 2] = a1 * db + a2 * bb;
dst[i + 3] = sa * alpha + a2 * ba;
dst[i + 3] = sa * opacity + a2 * ba;
}
dstContext.putImageData(dstData, offset.x, offset.y);
}