1 files changed, 70 insertions, 0 deletions
diff --git a/gfx/src/nsSize.h b/gfx/src/nsSize.h
new file mode 100644
index 000000000..f27c478f9
--- /dev/null
+++ b/gfx/src/nsSize.h
@@ -0,0 +1,70 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#ifndef NSSIZE_H
+#define NSSIZE_H
+
+#include "nsCoord.h"
+#include "mozilla/gfx/BaseSize.h"
+#include "mozilla/gfx/Point.h"
+
+// Maximum allowable size
+#define NS_MAXSIZE nscoord_MAX
+
+typedef mozilla::gfx::IntSize nsIntSize;
+
+struct nsSize : public mozilla::gfx::BaseSize<nscoord, nsSize> {
+  typedef mozilla::gfx::BaseSize<nscoord, nsSize> Super;
+
+  nsSize() : Super() {}
+  nsSize(nscoord aWidth, nscoord aHeight) : Super(aWidth, aHeight) {}
+
+  inline mozilla::gfx::IntSize ScaleToNearestPixels(float aXScale, float aYScale,
+                                        nscoord aAppUnitsPerPixel) const;
+  inline mozilla::gfx::IntSize ToNearestPixels(nscoord aAppUnitsPerPixel) const;
+
+  /**
+   * Return this size scaled to a different appunits per pixel (APP) ratio.
+   * @param aFromAPP the APP to scale from
+   * @param aToAPP the APP to scale to
+   */
+  MOZ_MUST_USE inline nsSize
+    ScaleToOtherAppUnits(int32_t aFromAPP, int32_t aToAPP) const;
+};
+
+inline mozilla::gfx::IntSize
+nsSize::ScaleToNearestPixels(float aXScale, float aYScale,
+                             nscoord aAppUnitsPerPixel) const
+{
+  return mozilla::gfx::IntSize(
+      NSToIntRoundUp(NSAppUnitsToDoublePixels(width, aAppUnitsPerPixel) * aXScale),
+      NSToIntRoundUp(NSAppUnitsToDoublePixels(height, aAppUnitsPerPixel) * aYScale));
+}
+
+inline mozilla::gfx::IntSize
+nsSize::ToNearestPixels(nscoord aAppUnitsPerPixel) const
+{
+  return ScaleToNearestPixels(1.0f, 1.0f, aAppUnitsPerPixel);
+}
+
+inline nsSize
+nsSize::ScaleToOtherAppUnits(int32_t aFromAPP, int32_t aToAPP) const {
+  if (aFromAPP != aToAPP) {
+    nsSize size;
+    size.width = NSToCoordRound(NSCoordScale(width, aFromAPP, aToAPP));
+    size.height = NSToCoordRound(NSCoordScale(height, aFromAPP, aToAPP));
+    return size;
+  }
+  return *this;
+}
+
+inline nsSize
+IntSizeToAppUnits(mozilla::gfx::IntSize aSize, nscoord aAppUnitsPerPixel)
+{
+  return nsSize(NSIntPixelsToAppUnits(aSize.width, aAppUnitsPerPixel),
+                NSIntPixelsToAppUnits(aSize.height, aAppUnitsPerPixel));
+}
+
+#endif /* NSSIZE_H */