summaryrefslogtreecommitdiffstats
path: root/testing/web-platform/tests/html/canvas/offscreen/pixel-manipulation/2d.imageData.get.clamp.html
blob: 825d00a5c4c9fe4cd9c9652e0331f5fd9273fc6b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<title>OffscreenCanvas test: 2d.imageData.get.clamp</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/html/canvas/resources/canvas-tests.js"></script>

<h1>2d.imageData.get.clamp</h1>
<p class="desc">getImageData() clamps colors to the range [0, 255]</p>


<script>
var t = async_test("getImageData() clamps colors to the range [0, 255]");
var t_pass = t.done.bind(t);
var t_fail = t.step_func(function(reason) {
    throw reason;
});
t.step(function() {

  var canvas = new OffscreenCanvas(100, 50);
  var ctx = canvas.getContext('2d');

  ctx.fillStyle = 'rgb(-100, -200, -300)';
  ctx.fillRect(0, 0, 100, 50);
  ctx.fillStyle = 'rgb(256, 300, 400)';
  ctx.fillRect(20, 10, 60, 10);
  var imgdata1 = ctx.getImageData(10, 5, 1, 1);
  _assertSame(imgdata1.data[0], 0, "imgdata1.data[\""+(0)+"\"]", "0");
  _assertSame(imgdata1.data[1], 0, "imgdata1.data[\""+(1)+"\"]", "0");
  _assertSame(imgdata1.data[2], 0, "imgdata1.data[\""+(2)+"\"]", "0");
  var imgdata2 = ctx.getImageData(30, 15, 1, 1);
  _assertSame(imgdata2.data[0], 255, "imgdata2.data[\""+(0)+"\"]", "255");
  _assertSame(imgdata2.data[1], 255, "imgdata2.data[\""+(1)+"\"]", "255");
  _assertSame(imgdata2.data[2], 255, "imgdata2.data[\""+(2)+"\"]", "255");
  t.done();

});
</script>