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Fix bug in Raster#getSubImage and add test.

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This commit is contained in:
Jonathan Puckey 2013-03-17 18:57:16 +01:00
parent 2058bf3438
commit 58247ea232
2 changed files with 28 additions and 1 deletions
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2
src/item/Raster.js
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@ -321,7 +321,7 @@ var Raster = this.Raster = PlacedItem.extend(/** @lends Raster# */{
rect = Rectangle.read(arguments);
var ctx = CanvasProvider.getContext(rect.getSize());
ctx.drawImage(this.getCanvas(), rect.x, rect.y,
canvas.width, canvas.height, 0, 0, canvas.width, canvas.height);
rect.width, rect.height, 0, 0, rect.width, rect.height);
return ctx.canvas;
},

27
test/tests/Raster.js
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@ -89,3 +89,30 @@ asyncTest('Raster#getPixel / setPixel', function(callback) {
callback();
};
});
asyncTest('Raster#getSubImage', function(callback) {
var raster = new Raster('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAIAAAD91JpzAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAABlJREFUeNpi+s/AwPCfgYmR4f9/hv8AAQYAHiAFAS8Lwy8AAAAASUVORK5CYII=');
raster.onLoad = function() {
var canvas = raster.getSubImage(new Rectangle({
point: [1, 0],
size: [1, 2]
}));
equals(function() {
return canvas.width;
}, 1);
equals(function() {
return canvas.height;
}, 2);
var ctx = canvas.getContext('2d');
var expected = [
// green pixel:
0, 255, 0, 255,
// white pixel:
255, 255, 255, 255
];
equals(function() {
return Base.equals(Array.prototype.slice.call(ctx.getImageData(0, 0, 1, 2).data), expected);
}, true);
callback();
};
});