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<html>
<head>
<script type="text/javascript">
function assert(cond, msg) { if (!cond) { throw msg; } }
function isSameTM(m1, m2) {
// XXX this is probably the ugliest possible way to write this function,
// but it's intended to be lowest-common-denominator
if (!(m1.length === 6 && m1.length === m2.length)) {
return false;
}
for (var i = 0; i < m1.length; ++i) {
if (m1[i] !== m2[i]) {
return false;
}
}
return true;
}
window.onload = function() {
var IM = [ 1, 0, 0, 1, 0, 0 ];
try {
var ctx = document.getElementById("c1").getContext("2d");
var singular = [ 0, 0, 0, 0, 0, 0 ];
ctx.mozCurrentTransform = singular;
assert(isSameTM(singular, ctx.mozCurrentTransform),
"Expected setting CTM to a singular matrix to work");
var inv = ctx.mozCurrentTransformInverse;
assert(!isSameTM(inv, inv),
"Expected to get back matrix of NaN's from currentTransformInverse");
ctx.mozCurrentTransform = IM;
var m = [ 1, 2, 3, 4, 5, 6 ];
ctx.mozCurrentTransform = m;
ctx.mozCurrentTransformInverse = singular;
assert(isSameTM(m, ctx.mozCurrentTransform),
"Setting currentTransformInverse to a singular matrix is a no-op");
ctx.mozCurrentTransform = IM;
} catch (e) {
document.body.innerHTML = "FAIL: "+ e.toString();
return;
}
document.body.innerHTML = "Pass";
}
</script>
</head>
<body>
<div><canvas id="c1" width="300" height="300"></canvas></div>
</body>
</html>
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