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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, r, g, b, a)
{
var color = ctx.getImageData(5, 5, 1, 1).data;
assert_array_equals(color, [r, g, b, a]);
}
promise_test(function() {
function testTransferFromImageBitmapNullability(greenImage) {
var bitmapCanvas = new OffscreenCanvas(width,height);
var bitmapCtx = bitmapCanvas.getContext('bitmaprenderer');
bitmapCtx.transferFromImageBitmap(greenImage);
// Make sure the bitmap renderer canvas is filled correctly.
var pngImage = document.getElementById("img");
bitmapCanvas.convertToBlob().then(function(blob){
pngImage.src = URL.createObjectURL(blob);
var myCanvasToTest = document.createElement('canvas');
myCanvasToTest.width = width;
myCanvasToTest.height = height;
var myCtxToTest = myCanvasToTest.getContext('2d');
myCtxToTest.drawImage(pngImage, 0, 0);
testCanvas(myCtxToTest, 0, 255, 0, 255);
});
}
var greenCanvas = document.createElement('canvas');
greenCanvas.width = width;
greenCanvas.height = height;
var greenCtx = greenCanvas.getContext('2d');
greenCtx.fillStyle = '#0f0';
greenCtx.fillRect(0, 0, width, height);
return Promise.all([
createImageBitmap(greenCanvas),
]).then(([greenImage]) => {
testTransferFromImageBitmapNullability(greenImage);
});
},'Test that transferToBlob works and produce the expected image');
</script>