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<!DOCTYPE HTML>
<html>
<head>
<script type="text/javascript">
if (window.testRunner)
testRunner.waitUntilDone();
window.jsTestIsAsync = true
</script>
</head>
<body>
<script src="../../resources/js-test.js"></script>
<script type="text/javascript" src="canvas-blending-helpers.js"></script>
<script type="text/javascript">
description("Series of tests to ensure correct results on applying different blend modes when drawing an image on top of another.");
var context;
function actualColor(x, y) {
return context.getImageData(x, y, 1, 1).data;
}
function checkBlendModeResult(i, context, sigma) {
var expectedColor = blendColors([129 / 255, 1, 129 / 255, 1], [1, 129 / 255, 129 / 255, 1], i);
var ac = "actualColor(0, 0)";
shouldBeCloseTo(ac + "[0]", expectedColor[0], sigma);
shouldBeCloseTo(ac + "[1]", expectedColor[1], sigma);
shouldBeCloseTo(ac + "[2]", expectedColor[2], sigma);
shouldBeCloseTo(ac + "[3]", expectedColor[3], sigma);
}
function drawElement(context, i) {
if (i >= blendModes.length) {
finishJSTest();
return;
}
debug("Testing blend mode " + blendModes[i]);
context.clearRect(0, 0, 10, 10);
context.save();
drawBackdropColorImageInContext(context, function() {
context.globalCompositeOperation = blendModes[i];
drawSourceColorImageInContext(context, function() {
checkBlendModeResult(i, context, 5);
context.restore();
debug('');
drawElement(context, ++i);
});
});
}
function runTest() {
var canvas = document.createElement("canvas");
var sigma = 5;
canvas.width = 10;
canvas.height = 10;
context = canvas.getContext("2d");
drawElement(context, 0);
}
runTest();
</script>
</body>
</html>
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