new file mode 100644
--- /dev/null
+++ b/window/rect.h
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2004-2006  Kazunori "jagarl" Ueno
+ * 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.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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.
+ */
+
+
+#ifndef __RECT_H__
+#define __RECT_H__
+
+#include<vector>
+
+struct Rect {
+	int lx, rx; // x = [lx,rx)
+	int ty, by; // y = [ty,by)
+
+	Rect(int x1, int y1);
+	Rect(int x1, int y1, int x2, int y2);
+	Rect(const Rect& rect);
+	Rect(const class Surface& rect);
+	Rect(const class TextGlyph& glyph);
+	void intersect(const Rect& rect);
+	bool is_crossed(const Rect& rect) const;
+	bool is_inner(const Rect& inner_rect) const;
+	bool is_nearly_inner(const Rect& inner_rect, int delta) const;
+	void join(const Rect& rect);
+	void rmove(int add_x, int add_y);
+	/** Subtracts rect from this. The resulting area is the set of pixels contained in this but not in the rect.
+	  * result will be push_backed to ret_array.
+	  */
+	void subtract(const Rect& rect, std::vector<Rect>& ret_array) const;
+	bool point_in(int x, int y) const;
+	bool empty(void) const {
+		return (lx == rx) || (ty == by);
+	}
+	int width(void) const {
+		return rx-lx;
+	}
+	int height(void) const {
+		return by-ty;
+	}
+};
+
+inline bool operator ==(const Rect& r1, const Rect& r2) {
+	return (r1.lx == r2.lx && r1.rx == r2.rx && r1.ty == r2.ty && r1.by == r2.by);
+}
+inline bool Rect::point_in(int x, int y) const {
+	return (lx <= x && x < rx && ty <= y && y < by);
+}
+
+struct Color {
+	int r,g,b,a;
+	Color(int _r, int _g, int _b) : r(_r),g(_g),b(_b),a(0xff) {}
+	Color(int _r, int _g, int _b, int _a) : r(_r),g(_g),b(_b),a(_a) {}
+};
+#endif