1 files changed, 76 insertions, 0 deletions
diff --git a/dom/svg/test/matrixUtils.js b/dom/svg/test/matrixUtils.js
new file mode 100644
index 000000000..9e316ed07
--- /dev/null
+++ b/dom/svg/test/matrixUtils.js
@@ -0,0 +1,76 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*-
+ * vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * Utilities for testing SVG matrices
+ */
+
+function createMatrix(a, b, c, d, e, f)
+{
+  var svg = document.getElementsByTagName("svg")[0];
+  var m = svg.createSVGMatrix();
+  m.a = a;
+  m.b = b;
+  m.c = c;
+  m.d = d;
+  m.e = e;
+  m.f = f;
+  return m;
+}
+
+// Lightweight dummy Matrix class for representing arrays that get passed in
+function MatrixFromArray(a)
+{
+  this.a = a[0];
+  this.b = a[1];
+  this.c = a[2];
+  this.d = a[3];
+  this.e = a[4];
+  this.f = a[5];
+}
+
+function cmpMatrix(a, b, msg)
+{
+  if (a.constructor === Array)
+    a = new MatrixFromArray(a);
+  if (b.constructor === Array)
+    b = new MatrixFromArray(b);
+
+  ok(a.a == b.a &&
+     a.b == b.b &&
+     a.c == b.c &&
+     a.d == b.d &&
+     a.e == b.e &&
+     a.f == b.f,
+     msg + " - got " + formatMatrix(a)
+         + ", expected " + formatMatrix(b));
+}
+
+function roughCmpMatrix(a, b, msg)
+{
+  if (a.constructor === Array)
+    a = new MatrixFromArray(a);
+  if (b.constructor === Array)
+    b = new MatrixFromArray(b);
+
+  const tolerance = 1 / 65535;
+  ok(Math.abs(b.a - a.a) < tolerance &&
+     Math.abs(b.b - a.b) < tolerance &&
+     Math.abs(b.c - a.c) < tolerance &&
+     Math.abs(b.d - a.d) < tolerance &&
+     Math.abs(b.e - a.e) < tolerance &&
+     Math.abs(b.f - a.f) < tolerance,
+     msg + " - got " + formatMatrix(a)
+         + ", expected " + formatMatrix(b));
+}
+
+function formatMatrix(m)
+{
+  if (m.constructor != Array)
+    return "(" + [m.a, m.b, m.c, m.d, m.e, m.f].join(', ') + ")";
+
+  return "(" + m.join(', ') + ")";
+}