gdi.h

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    RECT            rcBound;
   /**
    * head of the clipping rectangle list.
    */
    PCLIPRECT       head;
   /**
    * tail of the clipping rectangle list.
    */
    PCLIPRECT       tail;
   /**
    * The private block data heap used to allocate clipping rectangles.
    * \sa BLOCKHEAP
    */
    PBLOCKHEAP      heap;
} CLIPRGN;

/**
 * \var typedef CLIPRGN* PCLIPRGN
 * \brief Data type of the pointer to a CLIPRGN.
 *
 * \sa CLIPRGN
 */
typedef CLIPRGN* PCLIPRGN;

/**
 * \def InitFreeClipRectList(heap, size)
 * \brief Initializes the private block data heap used to allocate clipping rectangles.
 * \param heap The pointer to a BLOCKHEAP structure.
 * \param size The size of the heap.
 * 
 * \note This macro is defined to call \a InitBlockDataHeap function with \a bd_size set to 
 * \a sizeof(CLIPRECT).
 *
 * \sa InitBlockDataHeap
 */
#define InitFreeClipRectList(heap, size)    InitBlockDataHeap (heap, sizeof (CLIPRECT), size)

/**
 * \def ClipRectAlloc(heap)
 * \brief Allocates a clipping rectangles from the private block data heap.
 * \param heap The pointer to the initialized BLOCKHEAP structure.
 * 
 * \note This macro is defined to call \a BlockDataAlloc function.
 *
 * \sa BlockDataAlloc
 */
#define ClipRectAlloc(heap)     BlockDataAlloc (heap)

/**
 * \def FreeClipRect(heap, cr)
 * \brief Frees a clipping rectangle which is allocated from the private block data heap.
 * \param heap The pointer to the initialized BLOCKHEAP structure.
 * \param cr The pointer to the clipping rectangle to be freed.
 * 
 * \note This macro is defined to call \a BlockDataFree function.
 *
 * \sa BlockDataFree
 */
#define FreeClipRect(heap, cr)  BlockDataFree (heap, cr);

/**
 * \def DestroyFreeClipRectList(heap)
 * \brief Destroies the private block data heap used to allocate clipping rectangles.
 * \param heap The pointer to the BLOCKHEAP structure.
 * 
 * \note This macro is defined to call \a DestroyBlockDataHeap function.
 *
 * \sa DestroyBlockDataHeap
 */
#define DestroyFreeClipRectList(heap)   DestroyBlockDataHeap (heap);

/**
 * \fn void GUIAPI InitClipRgn (PCLIPRGN pRgn, PBLOCKHEAP pFreeList)
 * \brief Initializes a clipping region.
 *
 * Before intializing a clipping region, you should initialize a private
 * block data heap first. The region operations, such as \a UnionRegion function,
 * will allocate/free the clipping rectangles from/to the heap.
 * This function will set the \a heap field of \a pRgn to be \a pFreeList,
 * and empty the region.
 *
 * \param pRgn The pointer to the CLIPRGN structure to be initialized.
 * \param pFreeList The pointer to the initialized private block data heap.
 *
 * \sa InitFreeClipRectList, EmptyClipRgn.
 *
 * Example:
 *
 * \include initcliprgn.c
 */

void GUIAPI InitClipRgn (PCLIPRGN pRgn, PBLOCKHEAP pFreeList);

/**
 * \fn void GUIAPI EmptyClipRgn (PCLIPRGN pRgn)
 * \brief Empties a clipping region.
 *
 * This function empties a clipping region pointed to by \a pRgn.
 *
 * \param pRgn The pointer to the region.
 *
 * \sa InitClipRgn
 */
void GUIAPI EmptyClipRgn (PCLIPRGN pRgn);

/**
 * \fn BOOL GUIAPI ClipRgnCopy (PCLIPRGN pDstRgn, const CLIPRGN* pSrcRgn)
 * \brief Copies one region to another.
 *
 * This function copies the region pointed to by \a pSrcRgn to the region pointed to by \a pDstRgn. 
 *
 * \param pDstRgn The destination region.
 * \param pSrcRgn The source region.
 * \return TRUE on success, otherwise FALSE.
 *
 * \note This function will empty the region \a pDstRgn first.
 *
 * \sa EmptyClipRgn, ClipRgnIntersect, UnionRegion, SubtractRegion, XorRegion
 */
BOOL GUIAPI ClipRgnCopy (PCLIPRGN pDstRgn, const CLIPRGN* pSrcRgn);

/**
 * \fn BOOL GUIAPI ClipRgnIntersect (PCLIPRGN pRstRgn, const CLIPRGN* pRgn1, const CLIPRGN* pRgn2)
 * \brief Intersects two region.
 *
 * This function gets the intersection of two regions pointed to by \a pRgn1 and \a pRgn2 
 * respectively and puts the result to the region pointed to by \a pRstRgn.
 *
 * \param pRstRgn The intersected result region.
 * \param pRgn1 The first region.
 * \param pRgn2 The second region.
 * \return TRUE on success, otherwise FALSE.
 *
 * \note If \a pRgn1 does not intersected with \a pRgn2, the result region will be
 * a emgty region.
 *
 * \sa EmptyClipRgn, ClipRgnCopy, UnionRegion, SubtractRegion, XorRegion
 */
BOOL GUIAPI ClipRgnIntersect (PCLIPRGN pRstRgn,
                       const CLIPRGN* pRgn1, const CLIPRGN* pRgn2);

/**
 * \fn void GUIAPI GetClipRgnBoundRect (PCLIPRGN pRgn, PRECT pRect)
 * \brief Gets the bounding rectangle of a region.
 * 
 * This function gets the bounding rect of the region pointed to by \a pRgn, 
 * and returns the rect in the rect pointed to by \a pRect.
 *
 * \param pRgn The pointer to the region.
 * \param pRect The pointer to the result rect.
 *
 * \sa IsEmptyClipRgn
 */
void GUIAPI GetClipRgnBoundRect (PCLIPRGN pRgn, PRECT pRect);

/**
 * \fn BOOL GUIAPI SetClipRgn (PCLIPRGN pRgn, const RECT* pRect)
 * \brief Sets a region to contain only one rect.
 *
 * This function sets the region \a pRgn to contain only a rect pointed to by \a pRect.
 *
 * \param pRgn The pointer to the region.
 * \param pRect The pointer to the rect.
 * \return TRUE on success, otherwise FALSE.
 *
 * \note This function will empty the region \a pRgn first.
 *
 * \sa EmptyClipRgn
 */
BOOL GUIAPI SetClipRgn (PCLIPRGN pRgn, const RECT* pRect);

/**
 * \fn BOOL GUIAPI IsEmptyClipRgn (const CLIPRGN* pRgn)
 * \brief Determines whether a region is an empty region.
 *
 * This function determines whether the region pointed to by \a pRgn is an empty region.
 *
 * \param pRgn The pointer to the region.
 * \return TRUE for empty one, else for not empty region.
 *
 * \sa EmptyClipRgn
 */
BOOL GUIAPI IsEmptyClipRgn (const CLIPRGN* pRgn);

/**
 * \fn BOOL GUIAPI AddClipRect (PCLIPRGN pRgn, const RECT* pRect)
 * \brief Unions one rectangle to a region.
 *
 * This function unions a rectangle to the region pointed to by \a pRgn.
 *
 * \param pRgn The pointer to the region.
 * \param pRect The pointer to the rectangle.
 * \return TRUE on success, otherwise FALSE.
 *
 * \sa IntersectClipRect, SubtractClipRect
 */
BOOL GUIAPI AddClipRect (PCLIPRGN pRgn, const RECT* pRect);

/**
 * \fn BOOL GUIAPI IntersectClipRect (PCLIPRGN pRgn, const RECT* pRect)
 * \brief Intersects a rectangle with a region.
 *
 * This function intersects the region pointed to by \a pRgn with a rect pointed to by \a pRect.
 *
 * \param pRgn The pointer to the region.
 * \param pRect The pointer to the rectangle.
 * \return TRUE on success, otherwise FALSE.
 *
 * \sa AddClipRect, SubtractClipRect
 */
BOOL GUIAPI IntersectClipRect (PCLIPRGN pRgn, const RECT* pRect);

/**
 * \fn BOOL GUIAPI SubtractClipRect (PCLIPRGN pRgn, const RECT* pRect)
 * \brief Subtracts a rectangle from a region.
 *
 * This function subtracts a rect pointed to by \a pRect from the region pointed to by \a pRgn.
 *
 * \param pRgn The pointer to the region.
 * \param pRect The pointer to the rect.
 * \return TRUE on success, otherwise FALSE.
 *
 * \sa AddClipRect, IntersectClipRect
 */
BOOL GUIAPI SubtractClipRect (PCLIPRGN pRgn, const RECT* pRect);

/**
 * \fn BOOL GUIAPI PtInRegion (PCLIPRGN region, int x, int y)
 * \brief Determines whether a point is in a region.
 *
 * This function determines whether a point \a (x,y) is in the region pointed to by \a region.
 *
 * \param region The pointer to the region.
 * \param x x,y: The point.
 * \param y x,y: The point.
 * \return TRUE for in the region, otherwise FALSE.
 *
 * \note This fucntion defined only for _USE_NEWGAL.
 *
 * \sa RectInRegion
 */
BOOL GUIAPI PtInRegion (PCLIPRGN region, int x, int y);

/**
 * \fn BOOL GUIAPI RectInRegion (PCLIPRGN region, const RECT* rect)
 * \brief Determines whether a rectangle is intersected with a region.
 *
 * This function determines whether the rect \a rect is intersected with the region
 * pointed to by \a region.
 *
 * \param region The pointer to the region.
 * \param rect The pointer to the rect.
 * \return TRUE for in the region, otherwise FALSE.
 *
 * \note This fucntion defined only for _USE_NEWGAL.
 *
 * \sa PtInRegion
 */
BOOL GUIAPI RectInRegion (PCLIPRGN region, const RECT* rect);

/**
 * \fn void GUIAPI OffsetRegion (PCLIPRGN region, int x, int y)
 * \brief Offsets the region.
 *
 * This function offsets a given region pointed to by region.
 *
 * \param region The pointer to the region.
 * \param x x,y: Offsets on x and y coodinates.
 * \param y x,y: Offsets on x and y coodinates.
 *
 * \note This fucntion defined only for _USE_NEWGAL.
 */
void GUIAPI OffsetRegion (PCLIPRGN region, int x, int y);

#ifdef _USE_NEWGAL

/**
 * \fn BOOL GUIAPI UnionRegion (PCLIPRGN dst, const CLIPRGN* src1, const CLIPRGN* src2)
 * \brief Unions two regions.
 *
 * This function unions two regions pointed to by \a src1 and \a src2 respectively and
 * puts the result to the region pointed to by \a dst.
 *
 * \param dst The pointer to the result region.
 * \param src1 src1,src2: Two regions will be unioned.
 * \param src2 src1,src2: Two regions will be unioned.
 * \return TRUE on success, otherwise FALSE.
 *
 * \note This fucntion defined only for _USE_NEWGAL.
 *
 * \sa SubtractRegion, XorRegion
 */
BOOL GUIAPI UnionRegion (PCLIPRGN dst, const CLIPRGN* src1, const CLIPRGN* src2);

/**
 * \fn BOOL GUIAPI SubtractRegion (CLIPRGN* rgnD, const CLIPRGN* rgnM, const CLIPRGN* rgnS)
 * \brief Substrcts a region from another.
 *
 * This function subtracts \a rgnS from \a rgnM and leave the result in \a rgnD.
 *
 * \param rgnD The pointer to the difference region.
 * \param rgnM The pointer to the minuend region.
 * \param rgnS The pointer to the subtrahend region.
 * \return TRUE on success, otherwise FALSE.
 *
 * \note This fucntion defined only for _USE_NEWGAL.
 *
 * \sa UnionRegion, XorRegion
 */
BOOL GUIAPI SubtractRegion (CLIPRGN* rgnD, const CLIPRGN* rgnM, const CLIPRGN* rgnS);

/**
 * \fn BOOL GUIAPI XorRegion (CLIPRGN *dst, const CLIPRGN *src1, const CLIPRGN *src2)
 * \brief Does the XOR operation between two regions.
 *
 * This function does the XOR operation between two regions pointed to by
 * \a src1 and \a src2 and puts the result to the region pointed to by \a dst.
 *
 * \param dst The pointer to the result region.
 * \param src1 src1,src2: Two regions will be xor'ed.
 * \param src2 src1,src2: Two regions will be xor'ed.
 * \return TRUE on success, otherwise FALSE.
 *
 * \note This fucntion defined only for _USE_NEWGAL.
 *
 * \sa UnionRegion, SubtractRegion
 */
BOOL GUIAPI XorRegion (CLIPRGN *dst, const CLIPRGN *src1, const CLIPRGN *src2);

/**
 * \def UnionRectWithRegion
 * \brief Is an alias of \a AddClipRect
 * \sa AddClipRect
 */
#define UnionRectWithRegion     AddClipRect

/**
 * \def CopyRegion
 * \brief Is an alias of \a ClipRgnCopy
 * \sa ClipRgnCopy
 */
#define CopyRegion              ClipRgnCopy

/**
 * \def IntersectRegion
 * \brief Is an alias of \a ClipRgnIntersect
 * \sa ClipRgnIntersect
 */
#define IntersectRegion         ClipRgnIntersect

/**
 * \fn BOOL GUIAPI InitCircleRegion (PCLIPRGN dst, int x, int y, int r)
 * \brief Initializes a region to be an enclosed circle.
 *
 * \param dst The pointer to the region to be initialized.
 * \param x x,y: The center of the circle.
 * \param y x,y: The center of the circle.
 * \param r The radius of the circle.
 * \return TRUE on success, otherwise FALSE.
 *
 * \note This fucntion defined only for _USE_NEWGAL.
 *
 * \sa InitEllipseRegion, InitPolygonRegion
 */
BOOL GUIAPI InitCircleRegion (PCLIPRGN dst, int x, int y, int r);

/**
 * \fn BOOL GUIAPI InitEllipseRegion (PCLIPRGN dst, int x, int y, int rx, int ry)
 * \brief Initializes a region to be an enclosed ellipse.
 *
 * \param dst The pointer to the region to be initialized.
 * \param x x,y: The center of the ellipse.
 * \param y x,y: The center of the ellipse.
 * \param rx The x-radius of the ellipse.
 * \param ry The y-radius of the ellipse.
 * \return TRUE on success, otherwise FALSE.
 *
 * \note This fucntion defined only for _USE_NEWGAL.
 *
 * \sa InitCircleRegion, InitPolygonRegion
 */
BOOL GUIAPI InitEllipseRegion (PCLIPRGN dst, int x, int y, int rx, int ry);

/**
 * \fn BOOL GUIAPI InitPolygonRegion (PCLIPRGN dst, const POINT* pts, int vertices)