<!-- The letters in the right image should be blurry compared to the letters in the left image. -->
<canvas></canvas>
<img id="result">
<pre id="error"></pre>
<script>
if (window.testRunner)
testRunner.waitUntilDone();
var image = new Image();
image.onload = function() {
var canvas = document.querySelector('canvas');
canvas.width = this.width;
canvas.height = this.height;
var ctx = canvas.getContext('2d');
ctx.drawImage(this, 0, 0);
// setTimeout creates a frame barrier that locks the canvas into gpu
// acceleration mode when running under virtual/gpu
setTimeout(() => {
var dataURL = canvas.toDataURL('image/webp', 0.3); // low quality
if (!dataURL.match(/^data:image\/webp[;,]/))
error.textContent += "FAIL: the dataURL should have 'image/webp' type.";
else
result.src = dataURL;
document.body.style.zoom = 1.3; // zoom in to see the low quality
if (window.testRunner)
testRunner.notifyDone();
}, 0);
};
image.src = "resources/letters.png";
</script>