1 files changed, 78 insertions, 0 deletions
diff --git a/dom/svg/test/matrixUtils.js b/dom/svg/test/matrixUtils.js
new file mode 100644
index 0000000000..ed9b8297b9
--- /dev/null
+++ b/dom/svg/test/matrixUtils.js
@@ -0,0 +1,78 @@
+/* -*- 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(", ") + ")";
+}