/******************************Module*Header*******************************\
* Module Name: rgnddi.cxx
*
* Clip object call back routines
*
* Created: 25-Aug-1990 10:15:09
* Author: Donald Sidoroff [donalds]
*
* Copyright (c) 1990 Microsoft Corporation
\**************************************************************************/

#include "precomp.hxx"

/******************************Public*Routine******************************\
* CLIPOBJ *EngCreateClip()
*
* Create a long live clipping object for a driver
*
* History:
*  22-Sep-1992 -by- Donald Sidoroff [donalds]
* Wrote it.
\**************************************************************************/

CLIPOBJ *EngCreateClip()
{

    //
    // Note that we intentionally zero this memory on allocation. Even though
    // we're going to set some of these fields to non-zero values right away,
    // this is not a performance-critical function (a driver typically calls
    // this only once), and we save a lot of instruction bytes by not having to
    // zero a number of fields explicitly.
    //

    VOID *pv = EngAllocMem(FL_ZERO_MEMORY,
                           sizeof(ECLIPOBJ) + SINGLE_REGION_SIZE,
                           'vrdG');

    if (pv != NULL)
    {
        //
        // Make this a CLIPOBJ that doesn't clip anything.
        //

        ((ECLIPOBJ *) pv)->iDComplexity     = DC_TRIVIAL;
        ((ECLIPOBJ *) pv)->iFComplexity     = FC_RECT;
        ((ECLIPOBJ *) pv)->iMode            = TC_RECTANGLES;

        REGION *prgn = (REGION*)((PBYTE)pv + sizeof(ECLIPOBJ));
        ((ECLIPOBJ *) pv)->prgn             = prgn;

        RGNOBJ ro(prgn);
        static RECTL rcl = {NEG_INFINITY, NEG_INFINITY, POS_INFINITY,
                            POS_INFINITY};
        ro.vSet(&rcl);
    }

    return((CLIPOBJ *)pv);
}

/******************************Public*Routine******************************\
* VOID EngDeleteClip()
*
* Delete a long live clipping object for a driver
*
* History:
*  22-Sep-1992 -by- Donald Sidoroff [donalds]
* Wrote it.
\**************************************************************************/

VOID EngDeleteClip(CLIPOBJ *pco)
{
    if (pco == NULL)
    {
        WARNING("Driver calling to free NULL clipobj");
    }
    else
    {
        ASSERTGDI(pco->iUniq == 0, "Non-zero iUniq\n");
    }

    //
    // BUGBUG
    // We call EngFreeMem since some drivers like to free non-existant
    // Clip Objects.
    //

    EngFreeMem((PVOID)pco);

}