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diff --git a/Source/WebCore/platform/mac/PlatformScreenMac.mm b/Source/WebCore/platform/mac/PlatformScreenMac.mm
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+++ b/Source/WebCore/platform/mac/PlatformScreenMac.mm
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+/*
+ * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import "config.h"
+#import "PlatformScreen.h"
+
+#import "FloatRect.h"
+#import "Frame.h"
+#import "FrameView.h"
+#import "Page.h"
+
+namespace WebCore {
+
+int screenDepth(Widget*)
+{
+    return NSBitsPerPixelFromDepth([[NSScreen deepestScreen] depth]);
+}
+
+int screenDepthPerComponent(Widget*)
+{
+    return NSBitsPerSampleFromDepth([[NSScreen deepestScreen] depth]);
+}
+
+bool screenIsMonochrome(Widget*)
+{
+    return false;
+}
+
+// These functions scale between screen and page coordinates because JavaScript/DOM operations 
+// assume that the screen and the page share the same coordinate system.
+
+FloatRect screenRect(Widget* widget)
+{
+    NSWindow *window = widget ? [widget->platformWidget() window] : nil;
+    return toUserSpace([screenForWindow(window) frame], window);
+}
+
+FloatRect screenAvailableRect(Widget* widget)
+{
+    NSWindow *window = widget ? [widget->platformWidget() window] : nil;
+    return toUserSpace([screenForWindow(window) visibleFrame], window);
+}
+
+NSScreen *screenForWindow(NSWindow *window)
+{
+    NSScreen *screen = [window screen]; // nil if the window is off-screen
+    if (screen)
+        return screen;
+    
+    NSArray *screens = [NSScreen screens];
+    if ([screens count] > 0)
+        return [screens objectAtIndex:0]; // screen containing the menubar
+    
+    return nil;
+}
+
+FloatRect toUserSpace(const NSRect& rect, NSWindow *destination)
+{
+    FloatRect userRect = rect;
+    userRect.setY(NSMaxY([screenForWindow(destination) frame]) - (userRect.y() + userRect.height())); // flip
+    if (destination)
+        userRect.scale(1 / [destination userSpaceScaleFactor]); // scale down
+    return userRect;
+}
+
+NSRect toDeviceSpace(const FloatRect& rect, NSWindow *source)
+{
+    FloatRect deviceRect = rect;
+    if (source)
+        deviceRect.scale([source userSpaceScaleFactor]); // scale up
+    deviceRect.setY(NSMaxY([screenForWindow(source) frame]) - (deviceRect.y() + deviceRect.height())); // flip
+    return deviceRect;
+}
+
+NSPoint flipScreenPoint(const NSPoint& screenPoint, NSScreen *screen)
+{
+    NSPoint flippedPoint = screenPoint;
+    flippedPoint.y = NSMaxY([screen frame]) - flippedPoint.y;
+    return flippedPoint;
+}
+
+} // namespace WebCore