/usr/include/crystalspace-2.0/csgeom/csrectrg.h is in libcrystalspace-dev 2.0+dfsg-1build1.
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Copyright (C) 2001 by Christopher Nelson
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __CS_CSRECTREGION_H__
#define __CS_CSRECTREGION_H__
/**\file
* Splittable 2D rectangles.
*/
/**
* \addtogroup geom_utils
* @{ */
#include "csextern.h"
#include "csgeom/csrect.h"
#include "csutil/array.h"
#ifdef CS_DEBUG
// defining this causes the csRectRegionDebug class to be compiled in
//#define CS_DEBUG_RECT_REG
#endif
#ifdef CS_DEBUG_RECT_REG
class csRandomGen;
#endif
/**
* A rect region is a class that implements splittable 2d rectangles. The
* region may be composed of one or more rectangles that do not need to occupy
* the same area. The idea being that you need to be able to have a number of
* disparate rectangular regions for updates. This class uses csRect for
* nearly all rectangle operations.
* <p>
* To use you can Include and Exclude rectangles from this region. When
* finished, this class will have a list of optimal rectangles that occupy a
* region. If used properly, it will result in faster overall painting
* performance, since several areas will not require overwriting.
*/
class CS_CRYSTALSPACE_EXPORT csRectRegion
{
protected:
static const size_t FRAGMENT_BUFFER_SIZE=64;
/// The pointer the list of regions
csArray<csRect> region;
/// The fragment buffer, used for performing fragment operations
csRect fragment[FRAGMENT_BUFFER_SIZE];
/// The gather marker
size_t gather_mark;
/**
* Controls fragmentContainedRect, used to perform all-side clipping
* and edge intersection.
*/
void fragmentRect(csRect&, csRect&, int mode);
void nkSplit(csRect& r1, csRect& r2);
/// Work method fragments rects properly when they intersect.
void fragmentContainedRect(csRect &r1, csRect &r2);
/// Marks the current region insertion point for gather.
void markForGather();
/// Gathers all regions since the mark into the fragment buffer.
void gatherFragments();
public:
/// Constructor.
csRectRegion();
/// Destructor
~csRectRegion();
/**
* Add a rect to this region; may cause unions, but will not adjance
* (see csRect).
*/
void Include(const csRect &rect);
/// Exclude a rect from this region; may cause splitting.
void Exclude(const csRect &rect);
/// Clips everything in the region to the borders given.
void ClipTo(csRect &clip);
/// Returns the number of rectangles in this region
inline size_t Count() const { return region.GetSize(); }
/// Returns the rect at a specific index
inline const csRect& RectAt(size_t i) const { return region[i]; }
/// Resets the region count to zero.
void MakeEmpty();
};
#ifdef CS_DEBUG_RECT_REG
// this class is an alternate implementation of rectRegion
// it uses a 100 x 100 bool array to represent which pixels
// in that area are contained in a rectangle. This class is
// intended solely to aid in debugging the csRectRegion class.
#define CS_RECT_REG_SIZE 100
class CS_CRYSTALSPACE_EXPORT csRectRegionDebug
{
private:
bool area[CS_RECT_REG_SIZE][CS_RECT_REG_SIZE];
csRandomGen* rand;
// these values ought to help someone with a debugger
// quickly locate and reproduce failed tests.
unsigned int rand_seed;
int num_tests_complete;
public:
csRectRegionDebug();
~csRectRegionDebug();
/**
* Add a rect to this region; may cause unions, but will not adjance
* (see csRect).
*/
void Include(const csRect &rect);
/// Exclude a rect from this region
void Exclude(const csRect &rect);
/// Clips everything in the region to the borders given.
void ClipTo(const csRect &clip);
/// Resets the region count to zero.
void MakeEmpty();
/**
* Checks to see if a csRectRegion contains rectangles which exactly
* represent the area of this region.
*/
void AssertEqual(const csRectRegion &r);
/// Ensures that the contents of a rect are within (0,0)-(size-1,size-1)
bool CheckBounds(const csRect &clip);
/// Tests the current csRectRegion implmentation
void UnitTest();
/// Generates a random rect within the debug region
csRect RandRect();
/// Generates a random non-empty rect within the debug region
csRect RandNonEmptyRect();
};
#endif // CS_DEBUG
/** @} */
#endif // __CS_CSRECTREGION_H__
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