2d.layer.non-invertible-matrix.html

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This WPT test may be referenced by the following Test IDs:
- /html/canvas/element/layers/2d.layer.non-invertible-matrix.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->

<meta charset="UTF-8">

<link rel="match" href="2d.layer.non-invertible-matrix-expected.html">

<title>Canvas test: 2d.layer.non-invertible-matrix</title>

<h1>2d.layer.non-invertible-matrix</h1>

<p class="desc">Test drawing layers when the transform is not invertible.</p>

<canvas id="canvas" width="200" height="200">

  <p class="fallback">FAIL (fallback content)</p>

</canvas>

<script>

  const canvas = document.getElementById("canvas");

  const ctx = canvas.getContext('2d');

  ctx.fillStyle = 'blue';

  ctx.fillRect(30, 30, 50, 50);

  // Anything below will be non-rasterizable.

  ctx.scale(1, 0);

  // Open the layer with a non-invertible matrix. The whole layer will be

  // non-rasterizable.

  ctx.beginLayer();

  // Because the transform is global, the matrix is still non-invertible.

  ctx.fillStyle = 'rgba(225, 0, 0, 1)';

  ctx.fillRect(40, 70, 50, 50);

  // Set a valid matrix in the middle of the layer. This makes the global

  // matrix invertible again, but because because the layer was opened with a

  // non-invertible matrix, the whole layer remains non-rasterizable.

  ctx.setTransform(1, 0, 0, 1, 0, 0);

  ctx.fillStyle = 'green';

  ctx.fillRect(70, 40, 50, 50);

  ctx.endLayer();

</script>