Blitz - WPT: canvas-transform.https.html

wpt / css / css-paint-api / hidpi / canvas-transform.https.html

/css/css-paint-api/hidpi/canvas-transform.https.html

<!DOCTYPE html>
<html class="reftest-wait">
<link rel="help" href="https://drafts.css-houdini.org/css-paint-api/">
<link rel="match" href="canvas-transform-ref.html">
<style>
.container {
  width: 270px;
  height: 275px;
}

#canvas-geometry {
  background-image: paint(geometry);
}
</style>
<script src="/common/reftest-wait.js"></script>
<script src="/common/worklet-reftest.js"></script>
<body>
<div id="canvas-geometry" class="container"></div>

<script id="code" type="text/worklet">
// Regression test for crbug.com/970783. The canvas transform matrix should
// account for the devicePixelRatio, such that the clip bounds can be
// properly computed when applying clips.
registerPaint('geometry', class {
  paint(ctx, geom) {
    var fillW = 250;
    var fillH = 50;
    ctx.setTransform(devicePixelRatio, 0, 0, devicePixelRatio, 0, 100);
    ctx.beginPath();
    ctx.rect(0, 0, fillW, fillH);
    ctx.closePath();
    ctx.clip();
    ctx.fillStyle = 'green';
    ctx.fillRect(0, 0, fillW, fillH);
  }
});
</script>

<script>
    importWorkletAndTerminateTestAfterAsyncPaint(CSS.paintWorklet, document.getElementById('code').textContent);
</script>
</body>
</html>

/css/css-paint-api/hidpi/canvas-transform-ref.html

<!DOCTYPE html>
<html>
<body>
<canvas id ="canvas" width="540" height="550"></canvas>
<script>
var canvas = document.getElementById('canvas');
// In the test page, the paint worklet canvas has a size of width of 270 CSS
// pixels, and height of 275. To divided by 2 is to match the canvas size.
canvas.style.width = (canvas.width / 2) + 'px';
canvas.style.height = (canvas.height / 2) + 'px';
var ctx = canvas.getContext("2d");
var fillW = 250;
var fillH = 50;
ctx.setTransform(2 * devicePixelRatio, 0, 0, 2 * devicePixelRatio, 0, 200);
ctx.beginPath();
ctx.rect(0, 0, fillW, fillH);
ctx.closePath();
ctx.clip();
ctx.fillStyle = 'green';
ctx.fillRect(0, 0, fillW, fillH);
</script>
</body>
</html>