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Speed up Raster#getPixel().

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This commit is contained in:
Jürg Lehni 2013-04-24 18:09:58 -07:00
parent ead3646581
commit 420fb49230
1 changed files with 12 additions and 13 deletions
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25
src/item/Raster.js
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@ -445,12 +445,10 @@ var Raster = this.Raster = Item.extend(/** @lends Raster# */{
*/
getPixel: function(point) {
point = Point.read(arguments);
var pixels = this.getContext().getImageData(point.x, point.y, 1, 1).data,
components = [0, 0, 0];
for (var i = 0; i < 3; i++)
components[i] = pixels[i] / 255;
var data = this.getContext().getImageData(point.x, point.y, 1, 1).data;
// Alpha is separate now:
return new Color('rgb', components, pixels[3] / 255);
return new Color('rgb', [data[0] / 255, data[1] / 255, data[2] / 255],
data[3] / 255);
},
/**
@ -472,15 +470,16 @@ var Raster = this.Raster = Item.extend(/** @lends Raster# */{
*/
setPixel: function(point, color) {
var _point = Point.read(arguments),
_color = Color.read(arguments);
var ctx = this.getContext(true),
imageData = ctx.createImageData(1, 1),
_color = Color.read(arguments),
components = _color._convert('rgb'),
alpha = _color.getAlpha();
imageData.data[0] = components[0] * 255;
imageData.data[1] = components[1] * 255;
imageData.data[2] = components[2] * 255;
imageData.data[3] = alpha != null ? alpha * 255 : 255;
alpha = _color._alpha,
ctx = this.getContext(true),
imageData = ctx.createImageData(1, 1),
data = imageData.data;
data[0] = components[0] * 255;
data[1] = components[1] * 255;
data[2] = components[2] * 255;
data[3] = alpha != null ? alpha * 255 : 255;
ctx.putImageData(imageData, _point.x, _point.y);
},