render-vs-prerender

JavaScript performance comparison

Revision 47 of this test case created by Hairo

Preparation code

<canvas id="canvas1" width="640" height="480">
</canvas>
<script>
  var can = document.getElementById('canvas1');
  var ctx = can.getContext('2d');

  var can2 = document.createElement('canvas');
  can2.width = 100;
  can2.height = 40;
  var ctx2 = can2.getContext('2d');

  var can3 = document.createElement('canvas');
  can3.width = 300;
  can3.height = 100;
  var ctx3 = can3.getContext('2d');

  var can4 = document.createElement('canvas');
  can4.width = 300;
  can4.height = 100;
  var ctx4 = can4.getContext('2d');


  function render(context) {
    context.font = "20pt Arial";
    context.fillStyle = "black";
    context.fillText('Hello World', 50, 50);
  }

  render(ctx2);
  render(ctx3);
  render(ctx4);
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
render
render(ctx);
pending…
pre-rendered snug
ctx.drawImage(can2, 0, 0);
pending…
pre-rendered loose
ctx.drawImage(can3, 0, 0);
pending…
pre-rendered loose clipped
ctx.drawImage(can4, 0, 0, 100, 40, 0, 0, 100, 40);
pending…

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