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Redraw clipItem when drawing into separate canvas for blend-modes.

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Closes #228.
This commit is contained in:
Jürg Lehni 2013-06-11 20:41:20 -07:00
parent 20f7c567aa
commit 94e07e77f0
1 changed files with 9 additions and 4 deletions
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13
src/item/Item.js
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@ -2867,9 +2867,10 @@ var Item = Base.extend(Callback, /** @lends Item# */{
// over their fill.
// Exclude Raster items since they never draw a stroke and handle
// opacity by themselves (they also don't call _setStyles)
var parentCtx, itemOffset, prevOffset;
if (this._blendMode !== 'normal' || this._opacity < 1
&& this._type !== 'raster' && (this._type !== 'path'
var blending = this._blendMode !== 'normal',
parentCtx, itemOffset, prevOffset;
if (blending || this._opacity < 1 && this._type !== 'raster'
&& (this._type !== 'path'
|| this.getFillColor() && this.getStrokeColor())) {
// Apply the paren't global matrix to the calculation of correct
// bounds.
@ -2895,6 +2896,10 @@ var Item = Base.extend(Callback, /** @lends Item# */{
ctx.translate(-itemOffset.x, -itemOffset.y);
// Apply globalMatrix when blitting into temporary canvas.
(parentCtx ? globalMatrix : this._matrix).applyToContext(ctx);
// If we're blending and a clipItem is defined for the current rendering
// loop, we need to draw the clip item again into the separate canvas.
if (blending && param.clipItem)
param.clipItem.draw(ctx, param.extend({ clip: true }));
this._draw(ctx, param);
ctx.restore();
transforms.pop();
@ -2907,7 +2912,7 @@ var Item = Base.extend(Callback, /** @lends Item# */{
param.offset = prevOffset;
// If the item has a blendMode, use BlendMode#process to
// composite its canvas on the parentCanvas.
if (this._blendMode !== 'normal') {
if (blending) {
// The pixel offset of the temporary canvas to the parent
// canvas.
BlendMode.process(this._blendMode, ctx, parentCtx,