third_party/WebKit/LayoutTests/fast/canvas/canvas-drawImage-scaled-copy-to-self.html

<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script>
test(function(t) {
    var canvas = document.createElement("canvas");
    canvas.width = 10;
    canvas.height = 10;
    var ctx = canvas.getContext('2d');
    
    ctx.globalCompositeOperation = 'copy';
    ctx.fillStyle = '#0f0';
    ctx.fillRect(0, 0, 10, 10);
    ctx.drawImage(canvas, 0, 0, 10, 10, 0, 0, 5, 5);
    
    var imageData = ctx.getImageData(0, 0, 1, 1);
    var imgdata = imageData.data;
    assert_equals(imgdata[0], 0);
    assert_equals(imgdata[1], 255);
    assert_equals(imgdata[2], 0);
    assert_equals(imgdata[3], 255);
    
    imageData = ctx.getImageData(4, 4, 1, 1);
    imgdata = imageData.data;
    assert_equals(imgdata[0], 0);
    assert_equals(imgdata[1], 255);
    assert_equals(imgdata[2], 0);
    assert_equals(imgdata[3], 255);
    
    imageData = ctx.getImageData(4, 5, 1, 1);
    imgdata = imageData.data;
    assert_equals(imgdata[0], 0);
    assert_equals(imgdata[1], 0);
    assert_equals(imgdata[2], 0);
    assert_equals(imgdata[3], 0);
    
    imageData = ctx.getImageData(5, 4, 1, 1);
    imgdata = imageData.data;
    assert_equals(imgdata[0], 0);
    assert_equals(imgdata[1], 0);
    assert_equals(imgdata[2], 0);
    assert_equals(imgdata[3], 0);
}, 'Tests drawImage with self as source image, copy composite operation, and downsized destination rect. Regression test for issue crbug.com/330711');
</script>
</body>