testing/web-platform/tests/html/canvas/offscreen/transformations/2d.transformation.setTransform.skewed.html
author criss <ccozmuta@mozilla.com>
Thu, 19 May 2022 12:36:17 +0300
changeset 618192 ba856ffe455a3c5275f4255a5c4bce00ba5528d4
parent 604175 8c8326a5e1017f214639db0061c86bad7911f51d
permissions -rw-r--r--
Merge autoland to mozilla-central. a=merge

<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<title>OffscreenCanvas test: 2d.transformation.setTransform.skewed</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/html/canvas/resources/canvas-tests.js"></script>

<h1>2d.transformation.setTransform.skewed</h1>
<p class="desc"></p>


<script>
var t = async_test("");
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');

// Create green with a red square ring inside it
ctx.fillStyle = '#0f0';
ctx.fillRect(0, 0, 100, 50);
ctx.fillStyle = '#f00';
ctx.fillRect(20, 10, 60, 30);
ctx.fillStyle = '#0f0';
ctx.fillRect(40, 20, 20, 10);
// Draw a skewed shape to fill that gap, to make sure it is aligned correctly
ctx.setTransform(1,4, 2,3, 5,6);
// Post-transform coordinates:
//   [[20,10],[80,10],[80,40],[20,40],[20,10],[40,20],[40,30],[60,30],[60,20],[40,20],[20,10]];
// Hence pre-transform coordinates:
var pts=[[-7.4,11.2],[-43.4,59.2],[-31.4,53.2],[4.6,5.2],[-7.4,11.2],
         [-15.4,25.2],[-11.4,23.2],[-23.4,39.2],[-27.4,41.2],[-15.4,25.2],
         [-7.4,11.2]];
ctx.beginPath();
ctx.moveTo(pts[0][0], pts[0][1]);
for (var i = 0; i < pts.length; ++i)
    ctx.lineTo(pts[i][0], pts[i][1]);
ctx.fill();
_assertPixel(canvas, 21,11, 0,255,0,255, "21,11", "0,255,0,255");
_assertPixel(canvas, 79,11, 0,255,0,255, "79,11", "0,255,0,255");
_assertPixel(canvas, 21,39, 0,255,0,255, "21,39", "0,255,0,255");
_assertPixel(canvas, 79,39, 0,255,0,255, "79,39", "0,255,0,255");
_assertPixel(canvas, 39,19, 0,255,0,255, "39,19", "0,255,0,255");
_assertPixel(canvas, 61,19, 0,255,0,255, "61,19", "0,255,0,255");
_assertPixel(canvas, 39,31, 0,255,0,255, "39,31", "0,255,0,255");
_assertPixel(canvas, 61,31, 0,255,0,255, "61,31", "0,255,0,255");
t.done();

});
</script>