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example_html_canvas_layer_async.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>img.js - Example canvas as mask layer</title>
<script src="build/img.js"></script>
<script>
function drawEllipseByCenter(ctx, cx, cy, w, h) {
drawEllipse(ctx, cx - w / 2.0, cy - h / 2.0, w, h);
}
function drawEllipse(ctx, x, y, w, h) {
var kappa = .5522848;
var ox = (w / 2) * kappa; // control point offset horizontal
var oy = (h / 2) * kappa; // control point offset vertical
var xe = x + w; // x-end
var ye = y + h; // y-end
var xm = x + w / 2; // x-middle
var ym = y + h / 2; // y-middle
ctx.save();
ctx.beginPath();
ctx.moveTo(x, ym);
ctx.bezierCurveTo(x, ym - oy, xm - ox, y, xm, y);
ctx.bezierCurveTo(xm + ox, y, xe, ym - oy, xe, ym);
ctx.bezierCurveTo(xe, ym + oy, xm + ox, ye, xm, ye);
ctx.bezierCurveTo(xm - ox, ye, x, ym + oy, x, ym);
ctx.closePath();
ctx.fill();
ctx.restore();
}
window.onload = function () {
var w = 360;
var h = 360;
var iCanvas = new img.ImageCanvas(600, 450);
var canvas = document.createElement('canvas');
var ctx = canvas.getContext('2d');
var iCanvas2 = new img.ImageCanvas(650, 500);
var layer = iCanvas.addLayer('images/img1.jpg');
layer.addFilter('rgbAdjust', {r: 0.25, g: 0.25});
layer = iCanvas.addLayer('images/img2.jpg');
layer.addFilter('rgbAdjust', {r: 0.30, g: 0.20, b: 0.35});
canvas.width = w;
canvas.height = h;
ctx.fillStyle = 'grey';
drawEllipseByCenter(ctx, w / 2, h / 2, w, h);
layer.mask.addLayer(canvas);
iCanvas2.addLayer('black', 'cornflowerblue', 90, 0.65);
layer = iCanvas2.addLayer('black', 'gold', 270, 0.65);
layer.blendmode = 'screen';
layer = iCanvas2.addLayer('black', 'crimson', 0, 0.65);
layer.blendmode = 'screen';
layer = iCanvas2.addLayer('black', 'honeydew', 180, 0.65);
layer.blendmode = 'screen';
layer = iCanvas2.addLayer(iCanvas);
layer.blendmode = 'lighten';
iCanvas2.render(function (canvas) {
document.body.appendChild(canvas);
});
};
</script>
</head>
<body id="root">
</body>
</html>