scratchfoundation/paper.js
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Only rasterize an item's content if the resulting raster is not empty.

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closes #828
This commit is contained in:
Jürg Lehni 2015-11-12 10:11:31 +01:00
parent deafacdad0
commit 8149fa830b
1 changed files with 12 additions and 10 deletions
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22
src/item/Item.js
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@ -1541,16 +1541,18 @@ var Item = Base.extend(Emitter, /** @lends Item# */{
topLeft = bounds.getTopLeft().floor(),
bottomRight = bounds.getBottomRight().ceil(),
size = new Size(bottomRight.subtract(topLeft)),
canvas = CanvasProvider.getCanvas(size.multiply(scale)),
ctx = canvas.getContext('2d'),
matrix = new Matrix().scale(scale).translate(topLeft.negate());
ctx.save();
matrix.applyToContext(ctx);
// See Project#draw() for an explanation of new Base()
this.draw(ctx, new Base({ matrices: [matrix] }));
ctx.restore();
var raster = new Raster(Item.NO_INSERT);
raster.setCanvas(canvas);
raster = new Raster(Item.NO_INSERT);
if (!size.isZero()) {
var canvas = CanvasProvider.getCanvas(size.multiply(scale)),
ctx = canvas.getContext('2d'),
matrix = new Matrix().scale(scale).translate(topLeft.negate());
ctx.save();
matrix.applyToContext(ctx);
// See Project#draw() for an explanation of new Base()
this.draw(ctx, new Base({ matrices: [matrix] }));
ctx.restore();
raster.setCanvas(canvas);
}
raster.transform(new Matrix().translate(topLeft.add(size.divide(2)))
// Take resolution into account and scale back to original size.
.scale(1 / scale));