canvas-blitting-full

JavaScript performance comparison

Test case created by Ilmari

Preparation code

<script>
  var c = document.createElement('canvas');
  c.width = c.height = 256;
  var ctx = c.getContext('2d');
  
  var framebuffer = ctx.getImageData(0, 0, 256, 256);
</script>

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Testing in unknown unknown
Test Ops/sec
fillRect
 
ctx.clearRect(0, 0, 256, 256);
for (var j = 0; j < 256; j++) {
 for (var i = 0; i < 256; i++) {
  ctx.fillRect(i, j, 1, 1);
 }
}
 pending…
putImageData
 
var px = framebuffer.data;
for (var j = 0; j < 256; j++) {
 for (var i = 0; i < 256; i++) {
  var off = (j * 256 + i) * 4;
  px[off] = 0;
  px[off + 1] = 0;
  px[off + 2] = 0;
  px[off + 3] = 255;
 }
}
ctx.putImageData(framebuffer, 0, 0);
 pending…
gradient fillRect 
ctx.clearRect(0, 0, 256, 256);
for (var j = 0; j < 256; j++) {
 for (var i = 0; i < 256; i++) {
  ctx.fillStyle = 'rgba(' + i + ',0,' + j + ',1)';
  ctx.fillRect(i, j, 1, 1);
 }
}
 pending…
gradient putImageData
 
var px = framebuffer.data;
for (var j = 0; j < 256; j++) {
 for (var i = 0; i < 256; i++) {
  var off = (j * 256 + i) * 4;
  px[off] = i;
  px[off + 1] = 0;
  px[off + 2] = j;
  px[off + 3] = 255;
 }
}
ctx.putImageData(framebuffer, 0, 0);
 pending…

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