Make a SharedGraphics directory for classes shared between Kernel and LibGUI.

SharedGraphics/Point.h

@@ -0,0 +1,47 @@
+#pragma once
+
+class Rect;
+struct GUI_Point;
+
+class Point {
+public:
+    Point() { }
+    Point(int x, int y) : m_x(x) , m_y(y) { }
+    Point(const GUI_Point&);
+
+    int x() const { return m_x; }
+    int y() const { return m_y; }
+
+    void set_x(int x) { m_x = x; }
+    void set_y(int y) { m_y = y; }
+
+    void move_by(int dx, int dy)
+    {
+        m_x += dx;
+        m_y += dy;
+    }
+
+    void move_by(const Point& delta)
+    {
+        move_by(delta.x(), delta.y());
+    }
+
+    void constrain(const Rect&);
+
+    bool operator==(const Point& other) const
+    {
+        return m_x == other.m_x
+            && m_y == other.m_y;
+    }
+
+    bool operator!=(const Point& other) const
+    {
+        return !(*this == other);
+    }
+
+    operator GUI_Point() const;
+
+private:
+    int m_x { 0 };
+    int m_y { 0 };
+};