canvas-imageSmoothing-disabled-scaling-down.html

<!DOCTYPE HTML>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script>
function getCanvasDataFromDrawImage(source, disableSmoothing)
{
    var canvas = document.createElement("canvas");
    canvas.width = 100;
    canvas.height = 100;
    var ctx = canvas.getContext("2d");
    ctx.clearRect(0, 0, canvas.width, canvas.height);
    ctx.scale(0.9, 0.9);
    ctx.rotate(45 * Math.PI / 180);
    if (disableSmoothing)
        ctx.imageSmoothingEnabled = false;
    ctx.drawImage(source, 0, 0, source.width, source.height, 0, 0, 100, 100);
    var d = ctx.getImageData(0, 0, 100, 100).data;
    return d;
}

test(function() {
    var canvas = document.createElement('canvas');
    canvas.height = 100;
    canvas.width = 100;
    var ctx = canvas.getContext('2d');
    ctx.fillStyle = '#FF0000';
    ctx.fillRect(0, 0, canvas.width, canvas.height);
    var data1 = getCanvasDataFromDrawImage(canvas, false);
    var data2 = getCanvasDataFromDrawImage(canvas, true);
    assert_array_equals(data1, data2, "drawImage() should have the same results with imageSmoothingEnabled = true and false when scaling down.");
}, 'Test drawImage with imageSmoothingEnabled=false and scaling down the source.');

</script>

chromium/third_party/blink/web_tests/fast/canvas/canvas-imageSmoothing-disabled-scaling-down.html