bitmaprenderer-as-imagesource.html

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This WPT test may be referenced by the following Test IDs:
- /imagebitmap-renderingcontext/bitmaprenderer-as-imagesource.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>Canvas's ImageBitmapRenderingContext test</title>

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

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

<link rel="help" href="https://html.spec.whatwg.org/multipage/scripting.html#the-imagebitmap-rendering-context">

<script>

var width = 10;

var height = 10;

function testCanvas(ctx, x, y, r, g, b, a)

    var color = ctx.getImageData(x, y, 1, 1).data;

    assert_array_equals(color, [r, g, b, a]);

function consumeImageBitmap(image, t)

    var myCanvas = document.createElement('canvas');

    myCanvas.width = myCanvas.height = 20;

    var myCtx = myCanvas.getContext('bitmaprenderer');

    myCtx.transferFromImageBitmap(image);

    createImageBitmap(myCanvas).then(t.step_func_done(function(imageBitmap) {

        // Per spec, when transferFromImageBitmap happens, the transferred

        // ImageBitmap (|image| here) must determine the intrinsic size of

        // myCanvas, and hence myCanvas.width/height is ignored. Therefore,

        // |imageBitmap| should have the same size as the |image|.

        assert_equals(imageBitmap.width, width);

        assert_equals(imageBitmap.height, height);

        var dstCanvas = document.createElement('canvas');

        dstCanvas.width = dstCanvas.height = 20;

        var dstCtx = dstCanvas.getContext('2d');

        dstCtx.drawImage(myCanvas, 0, 0);

        testCanvas(dstCtx, 5, 5, 0, 255, 0, 255);

        testCanvas(dstCtx, 15, 15, 0, 0, 0, 0);

    }));

async_test(function(t) {

    var canvas = document.createElement("canvas");

    canvas.width = width;

    canvas.height = height;

    var ctx = canvas.getContext('2d');

    ctx.fillStyle = '#0f0';

    ctx.fillRect(0, 0, width, height);

    createImageBitmap(canvas).then(t.step_func(function(image) {

        consumeImageBitmap(image, t);

    }));

}, 'Test that createImageBitmap from a bitmaprenderer canvas produces correct result');

async_test(function(t) {

    var canvas = document.createElement("canvas");

    canvas.width = width;

    canvas.height = height;

    var ctx = canvas.getContext('bitmaprenderer');

    createImageBitmap(canvas).then(t.step_func_done(function(image) {

        assert_equals(image.width, width);

        assert_equals(image.height, height);

        var dstCanvas = document.createElement('canvas');

        dstCanvas.width = width;

        dstCanvas.height = height;

        var dstCtx = dstCanvas.getContext('2d');

        dstCtx.drawImage(canvas, 0, 0);

        testCanvas(dstCtx, 5, 5, 0, 0, 0, 0);

    }));

}, 'Test that createImageBitmap on a bitmaprenderer canvas that never consumes any source produces correct result');

async_test(function(t) {

    var canvas = document.createElement("canvas");

    canvas.width = width;

    canvas.height = height;

    var ctx = canvas.getContext('bitmaprenderer');

    ctx.transferFromImageBitmap(null);

    createImageBitmap(canvas).then(t.step_func_done(function(image) {

        assert_equals(image.width, width);

        assert_equals(image.height, height);

        var dstCanvas = document.createElement('canvas');

        dstCanvas.width = width;

        dstCanvas.height = height;

        var dstCtx = dstCanvas.getContext('2d');

        dstCtx.drawImage(canvas, 0, 0);

        testCanvas(dstCtx, 5, 5, 0, 0, 0, 0);

    }));

}, 'Test that createImageBitmap on a bitmaprenderer canvas that consumes null produces correct result');

</script>