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common/rfb/Rect.h

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+/* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
+ * 
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+
+// rfb::Rect and rfb::Point structures
+
+#ifndef __RFB_RECT_INCLUDED__
+#define __RFB_RECT_INCLUDED__
+
+// Some platforms (e.g. Windows) include max() and min() macros in their
+// standard headers, but they are also standard C++ template functions, so some
+// C++ headers will undefine them.  So we steer clear of the names min and max
+// and define __rfbmin and __rfbmax instead.
+
+#ifndef __rfbmax
+#define __rfbmax(a,b) (((a) > (b)) ? (a) : (b))
+#endif
+#ifndef __rfbmin
+#define __rfbmin(a,b) (((a) < (b)) ? (a) : (b))
+#endif
+
+namespace rfb {
+
+  // rfb::Point
+  //
+  // Represents a point in 2D space, by X and Y coordinates.
+  // Can also be used to represent a delta, or offset, between
+  // two Points.
+  // Functions are provided to allow Points to be compared for
+  // equality and translated by a supplied offset.
+  // Functions are also provided to negate offset Points.
+
+  struct Point {
+    Point() : x(0), y(0) {}
+    Point(int x_, int y_) : x(x_), y(y_) {}
+    inline Point negate() const {return Point(-x, -y);}
+    inline bool equals(const Point &p) const {return x==p.x && y==p.y;}
+    inline Point translate(const Point &p) const {return Point(x+p.x, y+p.y);}
+    inline Point subtract(const Point &p) const {return Point(x-p.x, y-p.y);}
+    int x, y;
+  };
+
+  // rfb::Rect
+  //
+  // Represents a rectangular region defined by its top-left (tl)
+  // and bottom-right (br) Points.
+  // Rects may be compared for equality, checked to determine whether
+  // or not they are empty, cleared (made empty), or intersected with
+  // one another.  The bounding rectangle of two existing Rects
+  // may be calculated, as may the area of a Rect.
+  // Rects may also be translated, in the same way as Points, by
+  // an offset specified in a Point structure.
+
+  struct Rect {
+    Rect() {}
+    Rect(Point tl_, Point br_) : tl(tl_), br(br_) {}
+    Rect(int x1, int y1, int x2, int y2) : tl(x1, y1), br(x2, y2) {}
+    inline void setXYWH(int x, int y, int w, int h) {
+      tl.x = x; tl.y = y; br.x = x+w; br.y = y+h;
+    }
+    inline Rect intersect(const Rect &r) const {
+      Rect result;
+      result.tl.x = __rfbmax(tl.x, r.tl.x);
+      result.tl.y = __rfbmax(tl.y, r.tl.y);
+      result.br.x = __rfbmax(__rfbmin(br.x, r.br.x), result.tl.x);
+      result.br.y = __rfbmax(__rfbmin(br.y, r.br.y), result.tl.y);
+      return result;
+    }
+    inline Rect union_boundary(const Rect &r) const {
+      if (r.is_empty()) return *this;
+      if (is_empty()) return r;
+      Rect result;
+      result.tl.x = __rfbmin(tl.x, r.tl.x);
+      result.tl.y = __rfbmin(tl.y, r.tl.y);
+      result.br.x = __rfbmax(br.x, r.br.x);
+      result.br.y = __rfbmax(br.y, r.br.y);
+      return result;
+    }
+    inline Rect translate(const Point &p) const {
+      return Rect(tl.translate(p), br.translate(p));
+    }
+    inline bool equals(const Rect &r) const {return r.tl.equals(tl) && r.br.equals(br);}
+    inline bool is_empty() const {return (tl.x >= br.x) || (tl.y >= br.y);}
+    inline void clear() {tl = Point(); br = Point();}
+    inline bool enclosed_by(const Rect &r) const {
+      return (tl.x>=r.tl.x) && (tl.y>=r.tl.y) && (br.x<=r.br.x) && (br.y<=r.br.y);
+    }
+    inline bool overlaps(const Rect &r) const {
+      return tl.x < r.br.x && tl.y < r.br.y && br.x > r.tl.x && br.y > r.tl.y;
+    }
+    inline int area() const {return is_empty() ? 0 : (br.x-tl.x)*(br.y-tl.y);}
+    inline Point dimensions() const {return Point(width(), height());}
+    inline int width() const {return br.x-tl.x;}
+    inline int height() const {return br.y-tl.y;}
+    inline bool contains(const Point &p) const {
+      return (tl.x<=p.x) && (tl.y<=p.y) && (br.x>p.x) && (br.y>p.y);
+    }
+    Point tl;
+    Point br;
+  };
+}
+#endif // __RFB_RECT_INCLUDED__