disable-acceleration-preserves-recording.html

<!DOCTYPE html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script>
test(() => {
  assert_true(!!window.internals, 'Tests require window.internals.');
}, 'Prerequisites to running the rest of the tests.');

function checkPixel(ctx, x, y, rgb) {
    assert_array_equals(ctx.getImageData(x, y, 1, 1).data.slice(0,3), rgb);
}

test(function(t) {
  const canvas = document.createElement('canvas');
  const ctx = canvas.getContext('2d');

  ctx.fillStyle = 'green';
  ctx.fillRect(0, 0, 10, 10);

  internals.disableCanvasAcceleration(canvas);

  ctx.fillStyle = 'blue';
  ctx.fillRect(10, 0, 10, 10);
  checkPixel(ctx, 5, 5, [0, 128, 0]);
  checkPixel(ctx, 15, 5, [0, 0, 255]);
}, 'Disabling acceleration preserves recording.');

test(function(t) {
  const canvas = document.createElement('canvas');
  const ctx = canvas.getContext('2d');

  ctx.fillStyle = 'green';
  ctx.fillRect(0, 0, 10, 10);

  // Read the canvas content to force rasterization.
  checkPixel(ctx, 5, 5, [0, 128, 0]);

  internals.disableCanvasAcceleration(canvas);

  ctx.fillStyle = 'blue';
  ctx.fillRect(10, 0, 10, 10);
  checkPixel(ctx, 5, 5, [0, 128, 0]);
  checkPixel(ctx, 15, 5, [0, 0, 255]);
}, 'Disabling acceleration preserves previously rasterized image.');
</script>
chromium/third_party/blink/web_tests/fast/canvas/disable-acceleration-preserves-recording.html
