canvas-resetTransform.html | Explore in Territory

<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<body>
<script>
test(function(t) {
    
    var canvas = document.createElement('canvas');
    document.body.appendChild(canvas);
    canvas.setAttribute('width', '100');
    canvas.setAttribute('height', '100');
    var ctx = canvas.getContext('2d');
    
    ctx.save();
    ctx.scale(0.5, 0.5);
    ctx.resetTransform();
    ctx.fillStyle = 'green';
    ctx.fillRect(0, 0, 100, 100);
    ctx.restore();
    
    var imageData = ctx.getImageData(98, 98, 1, 1).data;
    assert_array_equals(imageData.slice(0, 3), [0, 128, 0]);
    
    ctx.save();
    ctx.scale(0.5, 0.5);
    ctx.save();
    ctx.resetTransform();
    ctx.fillStyle = 'green';
    ctx.fillRect(0, 0, 100, 100);
    ctx.restore();
    ctx.fillStyle = 'red';
    ctx.fillRect(0, 0, 100, 100);
    ctx.restore();
    
    imageData = ctx.getImageData(98, 98, 1, 1).data;
    assert_array_equals(imageData.slice(0, 3), [0, 128, 0]);
    
    imageData = ctx.getImageData(48, 48, 1, 1).data;
    assert_array_equals(imageData.slice(0, 3), [255, 0, 0]);
    
    /* This should draw a green rectangle on on top of a red one. The red should not be visible. */
    ctx.save();
    ctx.beginPath();
    ctx.moveTo(0, 0);
    ctx.lineTo(100, 0);
    ctx.lineTo(100, 100);
    ctx.lineTo(0, 100);
    ctx.fillStyle = 'red';
    ctx.fill();
    ctx.translate(200, 0);
    ctx.resetTransform();
    ctx.fillStyle = 'green';
    ctx.fill();
    ctx.restore();
    
    imageData = ctx.getImageData(50, 50, 1, 1).data;
    assert_array_equals(imageData.slice(0, 3), [0, 128, 0]);
    
    ctx.save();
    ctx.fillStyle = 'red';
    ctx.fillRect(0, 0, 100, 100);
    ctx.beginPath();
    ctx.moveTo(0, 0);
    ctx.lineTo(100, 0);
    ctx.lineTo(100, 100);
    ctx.lineTo(0, 100);
    ctx.scale(0, 0);
    ctx.resetTransform();
    ctx.fillStyle = 'green';
    ctx.fill();
    ctx.restore();
    
    imageData = ctx.getImageData(98, 98, 1, 1).data;
    assert_array_equals(imageData.slice(0, 3), [0, 128, 0]);
    
    ctx.save();
    ctx.fillStyle = 'red';
    ctx.fillRect(0, 0, 100, 100);
    ctx.beginPath();
    ctx.moveTo(0, 0);
    ctx.lineTo(100, 0);
    ctx.lineTo(100, 50);
    ctx.scale(0, 0);
    ctx.lineTo(100, 100);
    ctx.resetTransform();
    ctx.lineTo(0, 100);
    ctx.fillStyle = 'green';
    ctx.fill();
    ctx.restore();
    
    imageData = ctx.getImageData(98, 98, 1, 1).data;
    assert_array_equals(imageData.slice(0, 3), [255, 0, 0]);
    
    imageData = ctx.getImageData(98, 48, 1, 1).data;
    assert_array_equals(imageData.slice(0, 3), [0, 128, 0]);
}, "This test checks resetTransform in canvas v5");
</script>
</body>
chromium/third_party/blink/web_tests/fast/canvas/canvas-resetTransform.html
