screen_rect.h

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//            Copyright (C) 2004-2007 by The Allacrost Project
//                         All Rights Reserved
//
// This code is licensed under the GNU GPL version 2. It is free software 
// and you may modify it and/or redistribute it under the terms of this license.
// See http://www.gnu.org/copyleft/gpl.html for details.

#ifndef __SCREEN_RECT_HEADER__
#define __SCREEN_RECT_HEADER__

#include "defs.h"
#include "utils.h"

namespace hoa_video {

class ScreenRect {
public: 
  ScreenRect()
    {}
  ScreenRect(int32 l, int32 t, int32 w, int32 h)
    : left(l), top(t), width(w), height(h) {}

  void Intersect(const ScreenRect &rect)
  {
    // Find max left and top coordinates
    if (rect.left > left)
      left = rect.left;
    if (rect.top > top)
      top = rect.top;

    // Find min right and bottom coordinates
    int32 right = left + width - 1;
    int32 bottom = top + height - 1;
    if (rect.left + rect.width - 1 < right)
      right = rect.left + rect.width - 1;
    if (rect.top + rect.height - 1 < bottom)
      bottom = rect.top + rect.height - 1;

    if (left > right || top > bottom) {
      left = right = width = height = 0;
    }
    else {
      width = right - left + 1;
      height = bottom - top + 1;
    }
  }

  int32 left, top;

  int32 width, height;
}; // class ScreenRect

}  // namespace hoa_video

#endif // __SCREEN_RECT_HEADER__

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