1 files changed, 30 insertions, 0 deletions
diff --git a/gfx/src/nsRect.cpp b/gfx/src/nsRect.cpp
new file mode 100644
index 0000000000..8f88c9190e
--- /dev/null
+++ b/gfx/src/nsRect.cpp
@@ -0,0 +1,30 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+#include "nsRect.h"
+#include "mozilla/gfx/Types.h"   // for eSideBottom, etc
+#include "mozilla/CheckedInt.h"  // for CheckedInt
+#include "nsDeviceContext.h"     // for nsDeviceContext
+#include "nsString.h"            // for nsAutoString, etc
+#include "nsMargin.h"            // for nsMargin
+
+static_assert(
+    (int(mozilla::eSideTop) == 0) && (int(mozilla::eSideRight) == 1) &&
+        (int(mozilla::eSideBottom) == 2) && (int(mozilla::eSideLeft) == 3),
+    "The mozilla::Side sequence must match the nsMargin nscoord sequence");
+
+const mozilla::gfx::IntRect& GetMaxSizedIntRect() {
+  static const mozilla::gfx::IntRect r(0, 0, INT32_MAX, INT32_MAX);
+  return r;
+}
+
+bool nsRect::Overflows() const {
+  mozilla::CheckedInt<int32_t> xMost = this->x;
+  xMost += this->width;
+  mozilla::CheckedInt<int32_t> yMost = this->y;
+  yMost += this->height;
+  return !xMost.isValid() || !yMost.isValid();
+}