<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/html/canvas/resources/canvas-tests.js"></script>
<link rel="help" href="https://html.spec.whatwg.org/#dom-offscreencanvas-transfertoimagebitmap">
<script id="myWorker" type="text/worker">
self.onmessage = function(e) {
};
</script>
<script>
function makeWorker(script)
{
var blob = new Blob([script]);
return new Worker(URL.createObjectURL(blob));
}
test(function() {
function testSize(contextType) {
var offscreenCanvas = new OffscreenCanvas(100, 50);
var ctx = offscreenCanvas.getContext(contextType);
var image = offscreenCanvas.transferToImageBitmap();
assert_equals(image.width, 100);
assert_equals(image.height, 50);
}
testSize('2d');
testSize('webgl');
}, "Test that transferToImageBitmap returns an ImageBitmap with correct width and height");
test(function() {
function testImageBitmapClr(shouldCallTwice, alphaVal) {
var offscreenCanvas = new OffscreenCanvas(100, 50);
var ctx = offscreenCanvas.getContext('2d', {alpha: alphaVal});
ctx.fillStyle = "#0f0";
ctx.fillRect(0, 0, 100, 50);
var image = offscreenCanvas.transferToImageBitmap();
if (shouldCallTwice)
image = offscreenCanvas.transferToImageBitmap();
var drawCanvas = document.createElement('canvas');
drawCanvas.width = 100;
drawCanvas.height = 50;
var dCtx = drawCanvas.getContext('2d');
dCtx.drawImage(image, 0, 0);
if (shouldCallTwice) {
if (alphaVal)
_assertPixel(drawCanvas, 50,25, 0,0,0,0);
else
_assertPixel(drawCanvas, 50,25, 0,0,0,255);
} else {
_assertPixel(drawCanvas, 50,25, 0,255,0,255);
}
}
testImageBitmapClr(false, true);
testImageBitmapClr(true, true);
testImageBitmapClr(true, false);
}, "Test that transferToImageBitmap returns an ImageBitmap with correct color");
test(function() {
var offscreenCanvas = new OffscreenCanvas(100, 50);
var ctx = offscreenCanvas.getContext('2d');
ctx.lineWidth = 10;
var image = offscreenCanvas.transferToImageBitmap();
assert_equals(ctx.lineWidth, 10);
}, "Test that transferToImageBitmap won't change context's property");
test(function() {
var offscreenCanvas = new OffscreenCanvas(100, 50);
var ctx = offscreenCanvas.getContext('2d');
ctx.rect(0, 0, 25, 50);
ctx.clip();
ctx.translate(20, 20);
ctx.fillStyle = '#0f0';
var image1 = offscreenCanvas.transferToImageBitmap();
// trasnform should be preserved
ctx.fillRect(0, 0, 10, 10);
var image2 = offscreenCanvas.transferToImageBitmap();
var drawCanvas = document.createElement('canvas');
drawCanvas.width = 100;
drawCanvas.height = 50;
var dCtx = drawCanvas.getContext('2d');
dCtx.drawImage(image2, 0, 0);
// Verify that transform was carried over.
_assertPixel(drawCanvas, 23,25, 0,255,0,255);
// Verify that clip was carried over.
_assertPixel(drawCanvas, 27,25, 0,0,0,0);
}, "Test that transferToImageBitmap preserves transform");
async_test(function(t) {
var worker = makeWorker(document.getElementById("myWorker").textContent);
var offscreenCanvas = new OffscreenCanvas(10, 10);
worker.postMessage(offscreenCanvas, [offscreenCanvas]);
assert_throws_dom("InvalidStateError", function() { offscreenCanvas.transferToImageBitmap(); });
t.done();
}, "Test that call transferToImageBitmap on a detached OffscreenCanvas throws an exception");
test(function() {
var offscreenCanvas = new OffscreenCanvas(10, 10);
assert_throws_dom("InvalidStateError", function() { offscreenCanvas.transferToImageBitmap(); });
}, "Test that transferToImageBitmap without a context throws an exception");
</script>
Codebase Browser
chromium