/* $Xorg: region.h,v 1.4 2001/02/09 02:03:40 xorgcvs Exp $ */
/************************************************************************

Copyright 1987, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of The Open Group shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from The Open Group.


Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its 
documentation for any purpose and without fee is hereby granted, 
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in 
supporting documentation, and that the name of Digital not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.  

DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.

************************************************************************/

#ifndef __REGION_SUPPORT_H
#define __REGION_SUPPORT_H

#include <Region.h>

class BRegion::Support {
 public:
        static  int                                     XUnionRegion(const BRegion* reg1,
                                                                        const BRegion* reg2, BRegion* newReg);

        static  int                                     XIntersectRegion(const BRegion* reg1,
                                                                        const BRegion* reg2, BRegion* newReg);

        static  int                                     XSubtractRegion(const BRegion* regM,
                                                                        const BRegion* regS, BRegion* regD);

        static  int                                     XXorRegion(const BRegion* sra,
                                                                        const BRegion* srb, BRegion* dr);

        static  bool                            XPointInRegion(const BRegion* region,
                                                                        int x, int y);

        enum {
                RectangleOut = 0,
                RectanglePart = 1,
                RectangleIn = 2
        };

        static  int                                     XRectInRegion(const BRegion* region,
                                                                        const clipping_rect& rect);

 private:
        static  BRegion*                        CreateRegion();
        static  void                            DestroyRegion(BRegion* r);

        static  void                            XOffsetRegion(BRegion* pRegion, int x, int y);

        static  void                            miSetExtents(BRegion* pReg);
        static  int                                     miIntersectO(BRegion* pReg,
                                                                        clipping_rect* r1, clipping_rect* r1End,
                                                                        clipping_rect* r2, clipping_rect* r2End,
                                                                        int top, int bottom);
        static  void                            miRegionCopy(BRegion* dstrgn, const BRegion* rgn);
        static  int                                     miCoalesce(BRegion* pReg,
                                                                        int prevStart, int curStart);
        static  int                                     miUnionNonO(BRegion* pReg, clipping_rect*       r,
                                                                        clipping_rect* rEnd, int top, int bottom);
        static  int                                     miUnionO(BRegion*       pReg,
                                                                        clipping_rect* r1, clipping_rect* r1End,
                                                                        clipping_rect* r2, clipping_rect* r2End,
                                                                        int     top, int bottom);
        static  int                                     miSubtractO(BRegion* pReg,
                                                                        clipping_rect* r1, clipping_rect* r1End,
                                                                        clipping_rect* r2, clipping_rect* r2End,
                                                                        int top, int bottom);
        static  int                                     miSubtractNonO1(BRegion* pReg,
                                                                        clipping_rect* r, clipping_rect* rEnd,
                                                                        int top, int bottom);



        typedef int (*overlapProcp)(
                BRegion* pReg,
                clipping_rect* r1,
                clipping_rect* r1End,
                clipping_rect* r2,
                clipping_rect* r2End,
                int top,
                int bottom);

        typedef int (*nonOverlapProcp)(
                BRegion* pReg,
                clipping_rect* r,
                clipping_rect* rEnd,
                int top,
                int bottom);

        static  void                            miRegionOp(BRegion* newReg,
                                                                        const BRegion* reg1, const BRegion* reg2,
    int (*overlapFunc)(
        BRegion*     pReg,
        clipping_rect*     r1,
        clipping_rect*              r1End,
        clipping_rect*     r2,
        clipping_rect*              r2End,
        int               top,
        int               bottom),
    int (*nonOverlap1Func)(
        BRegion*     pReg,
        clipping_rect*     r,
        clipping_rect*              rEnd,
        int      top,
        int      bottom),

    int (*nonOverlap2Func)(
        BRegion*     pReg,
        clipping_rect*     r,
        clipping_rect*              rEnd,
        int      top,
        int      bottom));

};

#endif // __REGION_SUPPORT_H