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
|
<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<title>OffscreenCanvas test: 2d.drawImage.negativedest</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/html/canvas/resources/canvas-tests.js"></script>
<h1>2d.drawImage.negativedest</h1>
<p class="desc">Negative destination width/height represents the correct rectangle</p>
<script>
promise_test(async t => {
var canvas = new OffscreenCanvas(100, 50);
var ctx = canvas.getContext('2d');
ctx.fillStyle = '#f00';
ctx.fillRect(0, 0, 100, 50);
const response = await fetch('/images/ggrr-256x256.png');
const blob = await response.blob();
const bitmap = await createImageBitmap(blob);
ctx.drawImage(bitmap, 100, 78, 50, 50, 0, 50, 50, -50);
ctx.drawImage(bitmap, 100, 128, 50, -50, 100, 50, -50, -50);
_assertPixelApprox(canvas, 1,1, 0,255,0,255, 2);
_assertPixelApprox(canvas, 1,48, 0,255,0,255, 2);
_assertPixelApprox(canvas, 98,1, 0,255,0,255, 2);
_assertPixelApprox(canvas, 98,48, 0,255,0,255, 2);
_assertPixelApprox(canvas, 48,1, 0,255,0,255, 2);
_assertPixelApprox(canvas, 48,48, 0,255,0,255, 2);
_assertPixelApprox(canvas, 51,1, 0,255,0,255, 2);
_assertPixelApprox(canvas, 51,48, 0,255,0,255, 2);
_assertPixelApprox(canvas, 25,25, 0,255,0,255, 2);
_assertPixelApprox(canvas, 75,25, 0,255,0,255, 2);
}, "Negative destination width/height represents the correct rectangle");
</script>
|
