<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>