canvas-createPattern-fillRect-shadow.html

<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<body>
<script>

// Create auxiliary canvas to draw to and create an image from.
// This is done instead of simply loading an image from the file system
// because that would throw a SECURITY_ERR DOM Exception.
var aCanvas = document.createElement('canvas');
aCanvas.setAttribute('width', '200');
aCanvas.setAttribute('height', '200');
var aCtx = aCanvas.getContext('2d');

// Draw a circle on the same canvas.
aCtx.beginPath();
aCtx.fillStyle = 'blue';
aCtx.arc(100, 100, 100, 0, Math.PI * 2, false);
aCtx.fill();

// Create the image object to be drawn on the master canvas.
var img = new Image();
img.src = aCanvas.toDataURL(); // set a data URI of the base64 encoded image as the source

// Create master canvas.
var canvas = document.createElement('canvas');
document.body.appendChild(canvas);
canvas.setAttribute('width', '700');
canvas.setAttribute('height', '1100');
var ctx = canvas.getContext('2d');

function drawImageToCanvasAndCheckPixels() {
    ctx.shadowOffsetX = 250;
    ctx.fillStyle = ctx.createPattern(img, 'repeat');

    ctx.shadowColor = 'rgba(255, 0, 0, 1.0)';
    ctx.fillRect(50, 50, 200, 200);

    ctx.shadowColor = 'rgba(255, 0, 0, 0.2)';
    ctx.fillRect(50, 300, 200, 200);

    ctx.shadowBlur = 10;
    ctx.shadowColor = 'rgba(255, 0, 0, 1.0)';
    ctx.fillRect(50, 550, 200, 200);

    ctx.shadowColor = 'rgba(255, 0, 0, 0.2)';
    ctx.fillRect(50, 800, 200, 200);

    checkPixels();
}

function checkPixels() {
    var imageData, data;

    // Verify solid shadow.
    imageData = ctx.getImageData(300, 50, 1, 1);
    d = imageData.data;
    assert_equals(d[0], 255);
    assert_equals(d[1], 0);
    assert_equals(d[2], 0);
    assert_equals(d[3], 255);

    imageData = ctx.getImageData(300, 249, 1, 1);
    d = imageData.data;
    assert_equals(d[0], 255);
    assert_equals(d[1], 0);
    assert_equals(d[2], 0);
    assert_equals(d[3], 255);

    imageData = ctx.getImageData(490, 240, 1, 1);
    d = imageData.data;
    assert_equals(d[0], 255);
    assert_equals(d[1], 0);
    assert_equals(d[2], 0);
    assert_equals(d[3], 255);

    // Verify solid alpha shadow.
    imageData = ctx.getImageData(310, 350, 1, 1);
    d = imageData.data;
    assert_equals(d[0], 255);
    assert_equals(d[1], 0);
    assert_equals(d[2], 0);
    assert_approx_equals(d[3], 51, 10);

    imageData = ctx.getImageData(490, 490, 1, 1);
    d = imageData.data;
    assert_equals(d[0], 255);
    assert_equals(d[1], 0);
    assert_equals(d[2], 0);
    assert_approx_equals(d[3], 51, 10);

    imageData = ctx.getImageData(300, 499, 1, 1);
    d = imageData.data;
    assert_equals(d[0], 255);
    assert_equals(d[1], 0);
    assert_equals(d[2], 0);
    assert_approx_equals(d[3], 51, 10);

    // Verify blurry shadow.
    imageData = ctx.getImageData(310, 550, 1, 1);
    d = imageData.data;
    assert_equals(d[0], 255);
    assert_equals(d[1], 0);
    assert_equals(d[2], 0);
    assert_approx_equals(d[3], 141, 10);

    imageData = ctx.getImageData(490, 750, 1, 1);
    d = imageData.data;
    assert_equals(d[0], 255);
    assert_equals(d[1], 0);
    assert_equals(d[2], 0);
    assert_approx_equals(d[3], 125, 10);

    imageData = ctx.getImageData(499, 499, 1, 1);
    d = imageData.data;
    assert_equals(d[0], 255);
    assert_equals(d[1], 0);
    assert_equals(d[2], 0);
    assert_approx_equals(d[3], 51, 10);

    // Verify blurry alpha shadow.
    imageData = ctx.getImageData(300, 850, 1, 1);
    d = imageData.data;
    assert_equals(d[0], 255);
    assert_equals(d[1], 0);
    assert_equals(d[2], 0);
    assert_approx_equals(d[3], 29, 10);

    imageData = ctx.getImageData(500, 875, 1, 1);
    d = imageData.data;
    assert_equals(d[0], 255);
    assert_equals(d[1], 0);
    assert_equals(d[2], 0);
    assert_approx_equals(d[3], 23, 10);

    imageData = ctx.getImageData(300, 900, 1, 1);
    d = imageData.data;
    assert_equals(d[0], 255);
    assert_equals(d[1], 0);
    assert_equals(d[2], 0);
    assert_approx_equals(d[3], 29, 10);
}

async_test(t => {
        img.onload = function() {
            t.step(drawImageToCanvasAndCheckPixels);
            t.done();
        }
}, "Ensure correct behavior of canvas with createPattern + fillRect with shadow.");
</script>
</body>
chromium/third_party/blink/web_tests/fast/canvas/canvas-createPattern-fillRect-shadow.html
