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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>Canvas Mask Demo</title>
<style>
html {
background-image: -webkit-gradient(
linear,
left bottom,
left top,
color-stop(0.13, rgb(119,84,184)),
color-stop(0.54, rgb(32,50,122))
);
background-image: -moz-linear-gradient(
center bottom,
rgb(119,84,184) 13%,
rgb(32,50,122) 54%
);
height:100%;
overflow:hidden;
}
body {
width:100%;
height:100%;
}
canvas {
position:relative;
width:500px;
height:500px;
left:50%;
top:50%;
margin:-250px 0 0 -250px;
-webkit-animation-name: rotate;
-webkit-transform:rotate(0deg);
}
canvas.rotate {
-webkit-animation-duration: 5s;
-webkit-animation-iteration-count: infinite;
-webkit-animation-timing-function: linear;
}
@-webkit-keyframes rotate {
from {
-webkit-transform: rotate(0deg);
}
to {
-webkit-transform: rotate(360deg);
}
}
</style>
</head>
<body>
<canvas id="master" width="500" height="500"></canvas>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js"></script>
<script src="canvasMask.js"></script>
<script>
(function() {
var paths = [
{ src: "img/alpha.png", type: "alpha" },
{ src: "img/octagon.jpg", type: "base" }
],
images = {},
outputCanvas = document.getElementById('master'),
output = outputCanvas.getContext && outputCanvas.getContext('2d'),
width = 500,
height = 500;
/**
Kick off.
*/
loadImages(function() {
output.globalCompositeOperation = "lighter";
output.putImageData(
applyCanvasMask(images['base'], images['alpha'], width, height), 0, 0, 0, 0, width, height
);
outputCanvas.className = "rotate";
$('body').css({'background-image': 'url(' + applyCanvasMask(images['base'], images['alpha'], width, height, true) + ')'});
});
/**
@private
@name loadImages
@function
@description Preload images and fire single callback
*/
function loadImages(callback) {
i = paths.length;
while (i--) {
loadImage(paths[i], function(type) {
images[type] = this;
c = 0;
for (o in images) c++;
c === paths.length && callback();
});
}
};
/**
@private
@name loadImage
@function
@description Preload (and compare) image
*/
function loadImage(obj, callback) {
var image = new Image();
// set onload actions
image.onload = function() {
typeof callback === 'function' && callback.call(this, obj.type);
};
// kick off image load
image.src = obj.src;
return this;
};
})();
</script>
</body>
</html>