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bitmaprenderer-as-imagesource.html
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bitmaprenderer-as-imagesource.html
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<!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>