diff --git a/libs/ui/Rect.cpp b/libs/ui/Rect.cpp
new file mode 100644
index 0000000..99e68bb
--- /dev/null
+++ b/libs/ui/Rect.cpp
@@ -0,0 +1,86 @@
+/*
+ *  Rect.cpp
+ *  Android
+ *
+ *  Created on 10/14/05.
+ *  Copyright 2005 The Android Open Source Project
+ *
+ */
+
+#include <ui/Rect.h>
+
+namespace android {
+
+inline int min(int a, int b) {
+    return (a<b) ? a : b;
+}
+
+inline int max(int a, int b) {
+    return (a>b) ? a : b;
+}
+
+void Rect::makeInvalid() {
+    left = 0;
+    top = 0;
+    right = -1;
+    bottom = -1;
+}
+
+bool Rect::operator < (const Rect& rhs) const
+{
+    if (top<rhs.top) {
+        return true;
+    } else if (top == rhs.top) {
+        if (left < rhs.left) {
+            return true;
+        } else if (left == rhs.left) {
+            if (bottom<rhs.bottom) {
+                return true;
+            } else if (bottom == rhs.bottom) {
+                if (right<rhs.right) {
+                    return true;
+                }
+            }
+        }
+    }
+    return false;
+}
+
+Rect& Rect::offsetTo(int x, int y)
+{
+    right -= left - x;
+    bottom -= top - y;
+    left = x;
+    top = y;
+    return *this;
+}
+
+Rect& Rect::offsetBy(int x, int y)
+{
+    left += x;
+    top  += y;
+    right+= x;
+    bottom+=y;
+    return *this;
+}
+
+Rect Rect::operator + (const Point& rhs) const
+{
+    return Rect(left+rhs.x, top+rhs.y, right+rhs.x, bottom+rhs.y); 
+}
+
+Rect Rect::operator - (const Point& rhs) const
+{
+    return Rect(left-rhs.x, top-rhs.y, right-rhs.x, bottom-rhs.y); 
+}
+
+bool Rect::intersect(const Rect& with, Rect* result) const
+{
+    result->left    = max(left, with.left);
+    result->top     = max(top, with.top);
+    result->right   = min(right, with.right);
+    result->bottom  = min(bottom, with.bottom);
+    return !(result->isEmpty());
+}
+
+}; // namespace android