platform/qt/fast/canvas/toDataURL-jpeg-alpha.html

<html>
<head>
    <script src="toDataURL-jpeg.js"></script>
    <script>
        if (window.testRunner)
            testRunner.dumpAsText();

        window.notifyEndTest = function ()
        {
            if (window.testRunner)
                testRunner.notifyDone();
        };

        function testToDataURL(canvas, ctx)
        {
            ctx.fillStyle = 'rgba(128, 255, 128, 0.5)';
            ctx.fillRect(0, 0, 100, 50);
            ctx.globalCompositeOperation = 'destination-over'; // should be ignored by toDataURL
            var data = canvas.toDataURL('image/jpeg');
            ctx.globalCompositeOperation = 'source-over';
            if (!data.match(/^data:image\/jpeg[;,]/)) {
                _assert(true, "true");
            } else {
                ctx.fillStyle = '#f00';
                ctx.fillRect(0, 0, 100, 50);
                var img = new Image();
                deferTest();
                img.onload = wrapFunction(function ()
                {
                    ctx.drawImage(img, 0, 0);
                    
                    _assertPixelApprox(canvas, 50,25, 63,127,63,255, "50,25", "63,127,63,255", 8);
                });
                img.src = data;
                if (window.testRunner)
                    testRunner.waitUntilDone();
            }
        }
        _addTest(testToDataURL);
    </script>
</head>
<body>
    <p>To verify jpeg data URL should take alpha component into account if canvas color has alpha component</p>
    <canvas id="c" width="100" height="50"></canvas>
    <p id="d"></p>
</body>
</html>