layout/reftests/canvas/ctm-singular-sanity.html@7e26c7da4463
layout/reftests/canvas/ctm-singular-sanity.html
Wed, 31 Dec 2014 06:55:50 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:55:50 +0100
- changeset 2
- 7e26c7da4463
- permissions
- -rw-r--r--
Added tag UPSTREAM_283F7C6 for changeset ca08bd8f51b2
1 <html>
2 <head>
3 <script type="text/javascript">
5 function assert(cond, msg) { if (!cond) { throw msg; } }
7 function isSameTM(m1, m2) {
8 // XXX this is probably the ugliest possible way to write this function,
9 // but it's intended to be lowest-common-denominator
10 if (!(m1.length === 6 && m1.length === m2.length)) {
11 return false;
12 }
13 for (var i = 0; i < m1.length; ++i) {
14 if (m1[i] !== m2[i]) {
15 return false;
16 }
17 }
18 return true;
19 }
21 window.onload = function() {
22 var IM = [ 1, 0, 0, 1, 0, 0 ];
24 try {
25 var ctx = document.getElementById("c1").getContext("2d");
27 var singular = [ 0, 0, 0, 0, 0, 0 ];
28 ctx.mozCurrentTransform = singular;
29 assert(isSameTM(singular, ctx.mozCurrentTransform),
30 "Expected setting CTM to a singular matrix to work");
31 var inv = ctx.mozCurrentTransformInverse;
32 assert(!isSameTM(inv, inv),
33 "Expected to get back matrix of NaN's from currentTransformInverse");
34 ctx.mozCurrentTransform = IM;
36 var m = [ 1, 2, 3, 4, 5, 6 ];
37 ctx.mozCurrentTransform = m;
38 ctx.mozCurrentTransformInverse = singular;
39 assert(isSameTM(m, ctx.mozCurrentTransform),
40 "Setting currentTransformInverse to a singular matrix is a no-op");
41 ctx.mozCurrentTransform = IM;
42 } catch (e) {
43 document.body.innerHTML = "FAIL: "+ e.toString();
44 return;
45 }
46 document.body.innerHTML = "Pass";
47 }
48 </script>
49 </head>
50 <body>
51 <div><canvas id="c1" width="300" height="300"></canvas></div>
52 </body>
53 </html>
