96 lines
3 KiB
JavaScript
96 lines
3 KiB
JavaScript
(function () {
|
|
var ns = $.namespace('pskl.utils');
|
|
var colorCache = {};
|
|
ns.FrameUtils = {
|
|
merge : function (frames) {
|
|
var merged = null;
|
|
if (frames.length) {
|
|
merged = frames[0];
|
|
var w = merged.getWidth(), h = merged.getHeight();
|
|
for (var i = 1 ; i < frames.length ; i++) {
|
|
pskl.utils.FrameUtils.mergeFrames_(merged, frames[i]);
|
|
}
|
|
}
|
|
return merged;
|
|
},
|
|
|
|
mergeFrames_ : function (frameA, frameB) {
|
|
frameB.forEachPixel(function (p, col, row) {
|
|
if (p != Constants.TRANSPARENT_COLOR) {
|
|
frameA.setPixel(col, row, p);
|
|
}
|
|
});
|
|
},
|
|
|
|
/**
|
|
* Alpha compositing using porter duff algorithm :
|
|
* http://en.wikipedia.org/wiki/Alpha_compositing
|
|
* http://keithp.com/~keithp/porterduff/p253-porter.pdf
|
|
* @param {String} strColor1 color over
|
|
* @param {String} strColor2 color under
|
|
* @return {String} the composite color
|
|
*/
|
|
mergePixels : function (strColor1, strColor2, globalOpacity1) {
|
|
var col1 = pskl.utils.FrameUtils.toRgba(strColor1);
|
|
var col2 = pskl.utils.FrameUtils.toRgba(strColor2);
|
|
if (typeof globalOpacity1 == 'number') {
|
|
col1 = JSON.parse(JSON.stringify(col1));
|
|
col1.a = globalOpacity1 * col1.a;
|
|
}
|
|
var a = col1.a + col2.a * (1 - col1.a);
|
|
|
|
var r = ((col1.r * col1.a + col2.r * col2.a * (1 - col1.a)) / a)|0;
|
|
var g = ((col1.g * col1.a + col2.g * col2.a * (1 - col1.a)) / a)|0;
|
|
var b = ((col1.b * col1.a + col2.b * col2.a * (1 - col1.a)) / a)|0;
|
|
|
|
return 'rgba('+r+','+g+','+b+','+a+')';
|
|
},
|
|
|
|
/**
|
|
* Convert a color defined as a string (hex, rgba, rgb, 'TRANSPARENT') to an Object with r,g,b,a properties.
|
|
* r, g and b are integers between 0 and 255, a is a float between 0 and 1
|
|
* @param {String} c color as a string
|
|
* @return {Object} {r:Number,g:Number,b:Number,a:Number}
|
|
*/
|
|
toRgba : function (c) {
|
|
if (colorCache[c]) {
|
|
return colorCache[c];
|
|
}
|
|
var color, matches;
|
|
if (c === 'TRANSPARENT') {
|
|
color = {
|
|
r : 0,
|
|
g : 0,
|
|
b : 0,
|
|
a : 0
|
|
};
|
|
} else if (c.indexOf('rgba(') != -1) {
|
|
matches = /rgba\((\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*,\s*(1|0\.\d+)\s*\)/.exec(c);
|
|
color = {
|
|
r : parseInt(matches[1],10),
|
|
g : parseInt(matches[2],10),
|
|
b : parseInt(matches[3],10),
|
|
a : parseFloat(matches[4])
|
|
};
|
|
} else if (c.indexOf('rgb(') != -1) {
|
|
matches = /rgb\((\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)/.exec(c);
|
|
color = {
|
|
r : parseInt(matches[1],10),
|
|
g : parseInt(matches[2],10),
|
|
b : parseInt(matches[3],10),
|
|
a : 1
|
|
};
|
|
} else {
|
|
matches = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(c);
|
|
color = {
|
|
r : parseInt(matches[1], 16),
|
|
g : parseInt(matches[2], 16),
|
|
b : parseInt(matches[3], 16),
|
|
a : 1
|
|
};
|
|
}
|
|
colorCache[c] = color;
|
|
return color;
|
|
}
|
|
};
|
|
})();
|