2dcontext/imagebitmap/createImageBitmap-drawImage.html

<!DOCTYPE html>
<html>
<title>createImageBitmap + drawImage test</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/canvas-tests.js"></script>
<script src="/common/media.js"></script>
<script src="/common/namespaces.js"></script>
<script src="common.sub.js"></script>
<link rel="stylesheet" href="/common/canvas-tests.css">
<body>
<script>
function testCanvasDisplayingPattern(canvas, width, height)
{
    var tolerance = 10; // for creating ImageBitmap from a video, the tolerance needs to be high
    const check = (x, y, r, g, b, a) =>
        _assertPixelApprox(canvas, x,y, r,g,b,a, `${x},${y}`, `${r},${g},${b},${a}`, tolerance);
    check(1 * width / 4, 1 * height / 4, 255,0,0,255);
    check(3 * width / 4, 1 * height / 4, 0,255,0,255);
    check(1 * width / 4, 3 * height / 4, 0,0,255,255);
    check(3 * width / 4, 3 * height / 4, 0,0,0,255);
}

function testDrawImageBitmap(source, args = [], { resizeWidth = 20, resizeHeight = 20 } = {})
{
    var canvas = document.createElement("canvas");
    canvas.width = resizeWidth;
    canvas.height = resizeHeight;
    var ctx = canvas.getContext("2d");
    return createImageBitmap(source, ...args).then(imageBitmap => {
        assert_equals(imageBitmap.width, resizeWidth);
        assert_equals(imageBitmap.height, resizeHeight);
        ctx.drawImage(imageBitmap, 0, 0);
        testCanvasDisplayingPattern(canvas, resizeWidth, resizeHeight);
    });
}

for (let { name, factory } of imageSourceTypes) {
    promise_test(function() {
        return factory().then(function(img) {
            return testDrawImageBitmap(img);
        });
    }, `createImageBitmap from ${name}, and drawImage on the created ImageBitmap`);

    promise_test(function() {
        return factory().then(function(img) {
            const options = { resizeWidth: 10, resizeHeight: 10 };
            return testDrawImageBitmap(img, [options], options);
        });
    }, `createImageBitmap from ${name} scaled down, and drawImage on the created ImageBitmap`);

    promise_test(function() {
        return factory().then(function(img) {
            const options = { resizeWidth: 40, resizeHeight: 40 };
            return testDrawImageBitmap(img, [options], options);
        });
    }, `createImageBitmap from ${name} scaled up, and drawImage on the created ImageBitmap`);

    promise_test(function() {
        return factory().then(function(img) {
            const options = { resizeWidth: 10, resizeHeight: 40 };
            return testDrawImageBitmap(img, [options], options);
        });
    }, `createImageBitmap from ${name} resized, and drawImage on the created ImageBitmap`);

    promise_test(function() {
        return factory().then(function(img) {
            return testDrawImageBitmap(img, [20, 20, -20, -20]);
        });
    }, `createImageBitmap from ${name} with negative sw/sh, and drawImage on the created ImageBitmap`);
}
</script>
</body>
</html>