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"use strict";
var mp = function(mp) {
mp.resource = {
loadImage: loadImage,
copyImageData: copyImageData,
parseColor: parseColor
};
/*
* Quick compatability workaround
* node testing environment needs new Canvas() and won't tolerate document.createElement("canvas")
* A createCanvas method is therefore provided in its sandbox which can be quickly checked to determine the method needed
*/
var createCanvas = "createCanvas" in document ? document.createCanvas : function() { return document.createElement("canvas"); };
var canvas = createCanvas();
var context = canvas.getContext("2d");
/*
* Load in an image given a URL.
* The provided callback will fire when loading is complete.
* The parameters will be false and the the imageData if successful, and false and the error otherwise.
*/
function loadImage(url, callback) {
var image = new Image();
image.onload = function() {
canvas.width = image.width;
canvas.height = image.height;
context.drawImage(image, 0, 0);
callback(false, context.getImageData(0, 0, image.width, image.height));
};
image.onerror = function(err) {
callback(true, err);
};
image.src = url;
}
function copyImageData(ctx, src) {
var dst = ctx.createImageData(src.width, src.height);
dst.data.set(src.data);
return dst;
}
/*
* Parses the given color string into an array of parts
*/
function parseColor(colorString) {
if (colorString[0] == "#") {
colorString = colorString.substring(1);
}
if (colorString.length == 3) {
var r = colorString[0] + colorString[0];
var g = colorString[1] + colorString[1];
var b = colorString[2] + colorString[2];
return [parseInt(r, 16), parseInt(g, 16), parseInt(b, 16)]
}
if (colorString.length == 6) {
return [parseInt(colorString.substring(0,2), 16), parseInt(colorString.substring(2,4), 16), parseInt(colorString.substring(4,6), 16)]
}
// TODO others?
return null;
}
return mp;
}(mp || {});
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