mouse.c

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/*
 * COPYRIGHT:        See COPYING in the top level directory
 * PROJECT:          ReactOS win32 subsystem
 * PURPOSE:          Mouse pointer functions
 * FILE:             win32ss/gdi/eng/mouse.c
 * PROGRAMER:        Casper S. Hornstrup (chorns@users.sourceforge.net)
 *                   Timo Kreuzer (timo.kreuzer@reactos.org)
 */
/* INCLUDES ******************************************************************/

#include <win32k.h>

#define NDEBUG
#include <debug.h>

/* FUNCTIONS *****************************************************************/

__drv_preferredFunction("(see documentation)", "Obsolete, always returns false. ")
BOOL
APIENTRY
EngSetPointerTag(
    _In_ HDEV hdev,
    _In_opt_ SURFOBJ *psoMask,
    _In_opt_ SURFOBJ *psoColor,
    _Reserved_ XLATEOBJ *pxlo,
    _In_ FLONG fl)
{
    // This function is obsolete for Windows 2000 and later.
    // This function is still supported, but always returns FALSE.
    // www.osr.com/ddk/graphics/gdifncs_4yav.htm
    return FALSE;
}

/*
 * FUNCTION: Notify the mouse driver that drawing is about to begin in
 * a rectangle on a particular surface.
 */
_Requires_lock_held_(*ppdev->hsemDevLock)
BOOL
NTAPI
MouseSafetyOnDrawStart(
    _Inout_ PPDEVOBJ ppdev,
    _In_ LONG HazardX1,
    _In_ LONG HazardY1,
    _In_ LONG HazardX2,
    _In_ LONG HazardY2)
{
    LONG tmp;
    GDIPOINTER *pgp;

    ASSERT(ppdev != NULL);
    ASSERT(ppdev->pSurface != NULL);

    pgp = &ppdev->Pointer;

    if (pgp->Exclude.right == -1)
    {
        return FALSE;
    }

    ppdev->SafetyRemoveCount++;

    if (ppdev->SafetyRemoveLevel != 0)
    {
        return FALSE;
    }

    if (HazardX1 > HazardX2)
    {
        tmp = HazardX2;
        HazardX2 = HazardX1;
        HazardX1 = tmp;
    }
    if (HazardY1 > HazardY2)
    {
        tmp = HazardY2;
        HazardY2 = HazardY1;
        HazardY1 = tmp;
    }

    if (pgp->Exclude.right >= HazardX1
        && pgp->Exclude.left <= HazardX2
        && pgp->Exclude.bottom >= HazardY1
        && pgp->Exclude.top <= HazardY2)
    {
        ppdev->SafetyRemoveLevel = ppdev->SafetyRemoveCount;
        ppdev->pfnMovePointer(&ppdev->pSurface->SurfObj, -1, -1, NULL);
    }

    return TRUE;
}

/*
 * FUNCTION: Notify the mouse driver that drawing has finished on a surface.
 */
_Requires_lock_held_(*ppdev->hsemDevLock)
BOOL
NTAPI
MouseSafetyOnDrawEnd(
    _Inout_ PPDEVOBJ ppdev)
{
    GDIPOINTER *pgp;

    ASSERT(ppdev != NULL);
    ASSERT(ppdev->pSurface != NULL);

    pgp = &ppdev->Pointer;

    if (pgp->Exclude.right == -1)
    {
        return FALSE;
    }

    if (--ppdev->SafetyRemoveCount >= ppdev->SafetyRemoveLevel)
    {
        return FALSE;
    }

    ppdev->pfnMovePointer(&ppdev->pSurface->SurfObj,
                          gpsi->ptCursor.x,
                          gpsi->ptCursor.y,
                          &pgp->Exclude);

    ppdev->SafetyRemoveLevel = 0;

    return TRUE;
}

/* SOFTWARE MOUSE POINTER IMPLEMENTATION **************************************/

VOID
NTAPI
IntHideMousePointer(
    _Inout_ PDEVOBJ *ppdev,
    _Inout_ SURFOBJ *psoDest)
{
    GDIPOINTER *pgp;
    POINTL pt;
    RECTL rclDest;
    POINTL ptlSave;

    ASSERT(ppdev);
    ASSERT(psoDest);

    pgp = &ppdev->Pointer;

    if (!pgp->Enabled)
    {
        return;
    }

    pgp->Enabled = FALSE;

    if (!pgp->psurfSave)
    {
        DPRINT("No SaveSurface!\n");
        return;
    }

    /* Calculate cursor coordinates */
    pt.x = ppdev->ptlPointer.x - pgp->HotSpot.x;
    pt.y = ppdev->ptlPointer.y - pgp->HotSpot.y;

    rclDest.left = max(pt.x, 0);
    rclDest.top = max(pt.y, 0);
    rclDest.right = min(pt.x + pgp->Size.cx, psoDest->sizlBitmap.cx);
    rclDest.bottom = min(pt.y + pgp->Size.cy, psoDest->sizlBitmap.cy);

    ptlSave.x = rclDest.left - pt.x;
    ptlSave.y = rclDest.top - pt.y;

    IntEngBitBlt(psoDest,
                 &pgp->psurfSave->SurfObj,
                 NULL,
                 NULL,
                 NULL,
                 &rclDest,
                 &ptlSave,
                 &ptlSave,
                 NULL,
                 NULL,
                 ROP4_FROM_INDEX(R3_OPINDEX_SRCCOPY));
}

VOID
NTAPI
IntShowMousePointer(
    _Inout_ PDEVOBJ *ppdev,
    _Inout_ SURFOBJ *psoDest)
{
    GDIPOINTER *pgp;
    POINTL pt;
    RECTL rclSurf, rclPointer;

    ASSERT(ppdev);
    ASSERT(psoDest);

    pgp = &ppdev->Pointer;

    if (pgp->Enabled)
    {
        return;
    }

    pgp->Enabled = TRUE;

    /* Check if we have any mouse pointer */
    if (!pgp->psurfSave) return;

    /* Calculate pointer coordinates */
    pt.x = ppdev->ptlPointer.x - pgp->HotSpot.x;
    pt.y = ppdev->ptlPointer.y - pgp->HotSpot.y;

    /* Calculate the rect on the surface */
    rclSurf.left = max(pt.x, 0);
    rclSurf.top = max(pt.y, 0);
    rclSurf.right = min(pt.x + pgp->Size.cx, psoDest->sizlBitmap.cx);
    rclSurf.bottom = min(pt.y + pgp->Size.cy, psoDest->sizlBitmap.cy);

    /* Calculate the rect in the pointer bitmap */
    rclPointer.left = rclSurf.left - pt.x;
    rclPointer.top = rclSurf.top - pt.y;
    rclPointer.right = min(pgp->Size.cx, psoDest->sizlBitmap.cx - pt.x);
    rclPointer.bottom = min(pgp->Size.cy, psoDest->sizlBitmap.cy - pt.y);

    /* Copy the pixels under the cursor to temporary surface. */
    IntEngBitBlt(&pgp->psurfSave->SurfObj,
                 psoDest,
                 NULL,
                 NULL,
                 NULL,
                 &rclPointer,
                 (POINTL*)&rclSurf,
                 NULL,
                 NULL,
                 NULL,
                 ROP4_FROM_INDEX(R3_OPINDEX_SRCCOPY));

    /* Blt the pointer on the screen. */
    if (pgp->psurfColor)
    {
        if(!(pgp->flags & SPS_ALPHA))
        {
            IntEngBitBlt(psoDest,
                         &pgp->psurfMask->SurfObj,
                         NULL,
                         NULL,
                         NULL,
                         &rclSurf,
                         (POINTL*)&rclPointer,
                         NULL,
                         NULL,
                         NULL,
                         ROP4_SRCAND);

            IntEngBitBlt(psoDest,
                         &pgp->psurfColor->SurfObj,
                         NULL,
                         NULL,
                         NULL,
                         &rclSurf,
                         (POINTL*)&rclPointer,
                         NULL,
                         NULL,
                         NULL,
                         ROP4_SRCINVERT);
         }
         else
         {
            BLENDOBJ blendobj = { {AC_SRC_OVER, 0, 255, AC_SRC_ALPHA } };
            EXLATEOBJ exlo;
            EXLATEOBJ_vInitialize(&exlo,
                &gpalRGB,
                ppdev->ppalSurf,
                0, 0, 0);
            IntEngAlphaBlend(psoDest,
                             &pgp->psurfColor->SurfObj,
                             NULL,
                             &exlo.xlo,
                             &rclSurf,
                             &rclPointer,
                             &blendobj);
            EXLATEOBJ_vCleanup(&exlo);
        }
    }
    else
    {
        IntEngBitBlt(psoDest,
                     &pgp->psurfMask->SurfObj,
                     NULL,
                     NULL,
                     NULL,
                     &rclSurf,
                     (POINTL*)&rclPointer,
                     NULL,
                     NULL,
                     NULL,
                     ROP4_FROM_INDEX(R3_OPINDEX_SRCAND));

        rclPointer.top += pgp->Size.cy;

        IntEngBitBlt(psoDest,
                     &pgp->psurfMask->SurfObj,
                     NULL,
                     NULL,
                     NULL,
                     &rclSurf,
                     (POINTL*)&rclPointer,
                     NULL,
                     NULL,
                     NULL,
                     ROP4_FROM_INDEX(R3_OPINDEX_SRCINVERT));
    }
}

/*
 * @implemented
 */
ULONG
APIENTRY
EngSetPointerShape(
    _In_ SURFOBJ *pso,
    _In_opt_ SURFOBJ *psoMask,
    _In_opt_ SURFOBJ *psoColor,
    _In_opt_ XLATEOBJ *pxlo,
    _In_ LONG xHot,
    _In_ LONG yHot,
    _In_ LONG x,
    _In_ LONG y,
    _In_ RECTL *prcl,
    _In_ FLONG fl)
{
    PDEVOBJ *ppdev;
    GDIPOINTER *pgp;
    LONG lDelta = 0;
    HBITMAP hbmSave = NULL, hbmColor = NULL, hbmMask = NULL;
    PSURFACE psurfSave = NULL, psurfColor = NULL, psurfMask = NULL;
    RECTL rectl;
    SIZEL sizel = {0, 0};

    ASSERT(pso);

    ppdev = GDIDEV(pso);
    pgp = &ppdev->Pointer;

    /* Handle the case where we have no XLATEOBJ */
    if (pxlo == NULL)
        pxlo = &gexloTrivial.xlo;

    /* Do we have any bitmap at all? */
    if (psoColor || psoMask)
    {
        /* Get the size of the new pointer */
        if (psoColor)
        {
            sizel.cx = psoColor->sizlBitmap.cx;
            sizel.cy = psoColor->sizlBitmap.cy;
        }
        else// if (psoMask)
        {
            sizel.cx = psoMask->sizlBitmap.cx;
            sizel.cy = psoMask->sizlBitmap.cy / 2;
        }

        rectl.left = 0;
        rectl.top = 0;
        rectl.right = sizel.cx;
        rectl.bottom = sizel.cy;

        /* Calculate lDelta for our surfaces. */
        lDelta = WIDTH_BYTES_ALIGN32(sizel.cx,
                                     BitsPerFormat(pso->iBitmapFormat));

        /* Create a bitmap for saving the pixels under the cursor. */
        hbmSave = EngCreateBitmap(sizel,
                                  lDelta,
                                  pso->iBitmapFormat,
                                  BMF_TOPDOWN | BMF_NOZEROINIT,
                                  NULL);
        psurfSave = SURFACE_ShareLockSurface(hbmSave);
        if (!psurfSave) goto failure;
    }

    if (psoColor)
    {
        if (fl & SPS_ALPHA)
        {
            /* Always store the alpha cursor in RGB. */
            EXLATEOBJ exloSrcRGB;
            PEXLATEOBJ pexlo;

            pexlo = CONTAINING_RECORD(pxlo, EXLATEOBJ, xlo);
            EXLATEOBJ_vInitialize(&exloSrcRGB, pexlo->ppalSrc, &gpalRGB, 0, 0, 0);

            hbmColor = EngCreateBitmap(psoColor->sizlBitmap,
                WIDTH_BYTES_ALIGN32(sizel.cx, 32),
                BMF_32BPP,
                BMF_TOPDOWN | BMF_NOZEROINIT,
                NULL);
            psurfColor = SURFACE_ShareLockSurface(hbmColor);
            if (!psurfColor) goto failure;

            /* Now copy the given bitmap. */
            rectl.bottom = psoColor->sizlBitmap.cy;
            IntEngCopyBits(&psurfColor->SurfObj,
                           psoColor,
                           NULL,
                           &exloSrcRGB.xlo,
                           &rectl,
                           (POINTL*)&rectl);

            EXLATEOBJ_vCleanup(&exloSrcRGB);
        }
        else
        {
            /* Color bitmap must have the same format as the dest surface */
            if (psoColor->iBitmapFormat != pso->iBitmapFormat)
            {
                DPRINT1("Screen surface and cursor color bitmap format don't match!.\n");
                goto failure;
            }

            /* Create a bitmap to copy the color bitmap to */
            hbmColor = EngCreateBitmap(psoColor->sizlBitmap,
                               lDelta,
                               pso->iBitmapFormat,
                               BMF_TOPDOWN | BMF_NOZEROINIT,
                               NULL);
            psurfColor = SURFACE_ShareLockSurface(hbmColor);
            if (!psurfColor) goto failure;

            /* Now copy the given bitmap. */
            rectl.bottom = psoColor->sizlBitmap.cy;
            IntEngCopyBits(&psurfColor->SurfObj,
                           psoColor,
                           NULL,
                           pxlo,
                           &rectl,
                           (POINTL*)&rectl);
        }

    }

    /* Create a mask surface */
    if (psoMask)
    {
        EXLATEOBJ exlo;
        PPALETTE ppal;

        lDelta = WIDTH_BYTES_ALIGN32(sizel.cx, BitsPerFormat(pso->iBitmapFormat));

        /* Create a bitmap for the mask */
        hbmMask = EngCreateBitmap(psoMask->sizlBitmap,
                                  lDelta,
                                  pso->iBitmapFormat,
                                  BMF_TOPDOWN | BMF_NOZEROINIT,
                                  NULL);
        psurfMask = SURFACE_ShareLockSurface(hbmMask);
        if (!psurfMask) goto failure;

        /* Initialize an EXLATEOBJ */
        ppal = PALETTE_ShareLockPalette(ppdev->devinfo.hpalDefault);
        EXLATEOBJ_vInitialize(&exlo,
                              gppalMono,
                              ppal,
                              0,
                              RGB(0xff,0xff,0xff),
                              RGB(0,0,0));

        /* Copy the mask bitmap */
        rectl.bottom = psoMask->sizlBitmap.cy;
        IntEngCopyBits(&psurfMask->SurfObj,
                       psoMask,
                       NULL,
                       &exlo.xlo,
                       &rectl,
                       (POINTL*)&rectl);

        /* Cleanup */
        EXLATEOBJ_vCleanup(&exlo);
        if (ppal) PALETTE_ShareUnlockPalette(ppal);
    }

    /* Hide mouse pointer */
    IntHideMousePointer(ppdev, pso);

    /* Free old color bitmap */
    if (pgp->psurfColor)
    {
        EngDeleteSurface(pgp->psurfColor->BaseObject.hHmgr);
        SURFACE_ShareUnlockSurface(pgp->psurfColor);
        pgp->psurfColor = NULL;
    }

    /* Free old mask bitmap */
    if (pgp->psurfMask)
    {
        EngDeleteSurface(pgp->psurfMask->BaseObject.hHmgr);
        SURFACE_ShareUnlockSurface(pgp->psurfMask);
        pgp->psurfMask = NULL;
    }

    /* Free old save bitmap */
    if (pgp->psurfSave)
    {
        EngDeleteSurface(pgp->psurfSave->BaseObject.hHmgr);
        SURFACE_ShareUnlockSurface(pgp->psurfSave);
        pgp->psurfSave = NULL;
    }

    /* See if we are being asked to hide the pointer. */
    if (psoMask == NULL && psoColor == NULL)
    {
        /* We're done */
        return SPS_ACCEPT_NOEXCLUDE;
    }

    /* Now set the new cursor */
    pgp->psurfColor = psurfColor;
    pgp->psurfMask = psurfMask;
    pgp->psurfSave = psurfSave;
    pgp->HotSpot.x = xHot;
    pgp->HotSpot.y = yHot;
    pgp->Size = sizel;
    pgp->flags = fl;

    if (x != -1)
    {
        ppdev->ptlPointer.x = x;
        ppdev->ptlPointer.y = y;

        IntShowMousePointer(ppdev, pso);

        if (prcl != NULL)
        {
            prcl->left = x - pgp->HotSpot.x;
            prcl->top = y - pgp->HotSpot.x;
            prcl->right = prcl->left + pgp->Size.cx;
            prcl->bottom = prcl->top + pgp->Size.cy;
        }
    }
    else if (prcl != NULL)
    {
        prcl->left = prcl->top = prcl->right = prcl->bottom = -1;
    }

    return SPS_ACCEPT_NOEXCLUDE;

failure:
    /* Cleanup surfaces */
    if (hbmMask) EngDeleteSurface((HSURF)hbmMask);
    if (psurfMask) SURFACE_ShareUnlockSurface(psurfMask);
    if (hbmColor) EngDeleteSurface((HSURF)hbmColor);
    if (psurfColor) SURFACE_ShareUnlockSurface(psurfColor);
    if (hbmSave) EngDeleteSurface((HSURF)hbmSave);
    if (psurfSave) SURFACE_ShareUnlockSurface(psurfSave);

    return SPS_ERROR;
}

/*
 * @implemented
 */
VOID
APIENTRY
EngMovePointer(
    _In_ SURFOBJ *pso,
    _In_ LONG x,
    _In_ LONG y,
    _In_ RECTL *prcl)
{
    PDEVOBJ *ppdev;
    GDIPOINTER *pgp;

    ASSERT(pso);

    ppdev = GDIDEV(pso);
    ASSERT(ppdev);

    pgp = &ppdev->Pointer;

    IntHideMousePointer(ppdev, pso);

    ppdev->ptlPointer.x = x;
    ppdev->ptlPointer.y = y;

    if (x != -1)
    {
        IntShowMousePointer(ppdev, pso);
        if (prcl != NULL)
        {
            prcl->left = x - pgp->HotSpot.x;
            prcl->top = y - pgp->HotSpot.y;
            prcl->right = prcl->left + pgp->Size.cx;
            prcl->bottom = prcl->top + pgp->Size.cy;
        }
    }
    else if (prcl != NULL)
    {
        prcl->left = prcl->top = prcl->right = prcl->bottom = -1;
    }
}

ULONG
NTAPI
IntEngSetPointerShape(
    _In_ SURFOBJ *pso,
    _In_opt_ SURFOBJ *psoMask,
    _In_opt_ SURFOBJ *psoColor,
    _In_opt_ XLATEOBJ *pxlo,
    _In_ LONG xHot,
    _In_ LONG yHot,
    _In_ LONG x,
    _In_ LONG y,
    _In_ RECTL *prcl,
    _In_ FLONG fl)
{
    ULONG ulResult = SPS_DECLINE;
    PFN_DrvSetPointerShape pfnSetPointerShape;
    PPDEVOBJ ppdev = GDIDEV(pso);
    BOOL bHardwarePointer = FALSE;
    BOOL bSoftwarePointer = TRUE;

    pfnSetPointerShape = GDIDEVFUNCS(pso).SetPointerShape;

    if (pfnSetPointerShape)
    {
        /* Drivers expect to get an XLATEOBJ */
        if (pxlo == NULL)
            pxlo = &gexloTrivial.xlo;

        /* Call the driver */
        ulResult = pfnSetPointerShape(pso,
                                      psoMask,
                                      psoColor,
                                      pxlo,
                                      xHot,
                                      yHot,
                                      x,
                                      y,
                                      prcl,
                                      fl);

        /* Check if the driver accepted it */
        if (ulResult == SPS_ACCEPT_NOEXCLUDE)
            bHardwarePointer = TRUE;

        bSoftwarePointer = !bHardwarePointer;
    }

    if (bSoftwarePointer)
    {
        /* Set software pointer */
        ulResult = EngSetPointerShape(pso,
                                      psoMask,
                                      psoColor,
                                      pxlo,
                                      xHot,
                                      yHot,
                                      x,
                                      y,
                                      prcl,
                                      fl);
    }

    if (!bSoftwarePointer && ppdev->flFlags & PDEV_SOFTWARE_POINTER)
    {
        /* Disable software pointer */
        EngMovePointer(pso, -1, -1, NULL);
    }

    if (!bHardwarePointer && ppdev->flFlags & PDEV_HARDWARE_POINTER)
    {
        /* Disable hardware pointer */
        ppdev->pfnMovePointer(pso, -1, -1, NULL);
    }

    /* Update flags */
    if (bSoftwarePointer)
        ppdev->flFlags |= PDEV_SOFTWARE_POINTER;
    else
        ppdev->flFlags &= ~PDEV_SOFTWARE_POINTER;

    if (bHardwarePointer)
        ppdev->flFlags |= PDEV_HARDWARE_POINTER;
    else
        ppdev->flFlags &= ~PDEV_HARDWARE_POINTER;

    return ulResult;
}

ULONG
NTAPI
GreSetPointerShape(
    _In_ HDC hdc,
    _In_opt_ HBITMAP hbmMask,
    _In_opt_ HBITMAP hbmColor,
    _In_ LONG xHot,
    _In_ LONG yHot,
    _In_ LONG x,
    _In_ LONG y,
    _In_ FLONG fl)
{
    PDC pdc;
    PSURFACE psurf, psurfMask, psurfColor;
    EXLATEOBJ exlo;
    ULONG ulResult = 0;

    pdc = DC_LockDc(hdc);
    if (!pdc)
    {
        DPRINT1("Failed to lock the DC.\n");
        return 0;
    }

    ASSERT(pdc->dctype == DCTYPE_DIRECT);
    EngAcquireSemaphore(pdc->ppdev->hsemDevLock);
    /* We're not sure DC surface is the good one */
    psurf = pdc->ppdev->pSurface;
    if (!psurf)
    {
        DPRINT1("DC has no surface.\n");
        EngReleaseSemaphore(pdc->ppdev->hsemDevLock);
        DC_UnlockDc(pdc);
        return 0;
    }

    /* Lock the mask bitmap */
    if (hbmMask)
    {
        psurfMask = SURFACE_ShareLockSurface(hbmMask);
    }
    else
    {
        //ASSERT(fl & SPS_ALPHA);
        psurfMask = NULL;
    }

    /* Check for color bitmap */
    if (hbmColor)
    {
        /* We have one, lock it */
        psurfColor = SURFACE_ShareLockSurface(hbmColor);

        if (psurfColor)
        {
            /* Create an XLATEOBJ, no mono support */
            EXLATEOBJ_vInitialize(&exlo, psurfColor->ppal, psurf->ppal, 0, 0, 0);
        }
    }
    else
        psurfColor = NULL;

    /* We must have a valid surface in case of alpha bitmap */
    ASSERT(((fl & SPS_ALPHA) && psurfColor) || !(fl & SPS_ALPHA));

    /* Call the driver or eng function */
    ulResult = IntEngSetPointerShape(&psurf->SurfObj,
                                     psurfMask ? &psurfMask->SurfObj : NULL,
                                     psurfColor ? &psurfColor->SurfObj : NULL,
                                     psurfColor ? &exlo.xlo : NULL,
                                     xHot,
                                     yHot,
                                     x,
                                     y,
                                     &pdc->ppdev->Pointer.Exclude,
                                     fl | SPS_CHANGE);

    /* Cleanup */
    if (psurfColor)
    {
        EXLATEOBJ_vCleanup(&exlo);
        SURFACE_ShareUnlockSurface(psurfColor);
    }

    if (psurfMask)
        SURFACE_ShareUnlockSurface(psurfMask);

    EngReleaseSemaphore(pdc->ppdev->hsemDevLock);

    /* Unlock the DC */
    DC_UnlockDc(pdc);

    /* Return result */
    return ulResult;
}

VOID
NTAPI
GreMovePointer(
    _In_ HDC hdc,
    _In_ LONG x,
    _In_ LONG y)
{
    PDC pdc;
    PRECTL prcl;

    /* Lock the DC */
    pdc = DC_LockDc(hdc);
    if (!pdc)
    {
        DPRINT1("Failed to lock the DC.\n");
        return;
    }
    ASSERT(pdc->dctype == DCTYPE_DIRECT);

    /* Acquire PDEV lock */
    EngAcquireSemaphore(pdc->ppdev->hsemDevLock);

    /* Check if we need to move it */
    if(pdc->ppdev->SafetyRemoveLevel == 0)
    {
        SURFOBJ* pso = &pdc->ppdev->pSurface->SurfObj;

        /* Store the cursor exclude position in the PDEV */
        prcl = &pdc->ppdev->Pointer.Exclude;

        /* Send new position of the hot spot of the pointer (will likely redraw cursor) */
        if (pdc->ppdev->flFlags & PDEV_HARDWARE_POINTER)
            pdc->ppdev->pfnMovePointer(pso, x, y, prcl);
        else if (pdc->ppdev->flFlags & PDEV_SOFTWARE_POINTER)
            EngMovePointer(pso, x, y, prcl);

        /* If panning device, and we're not hiding the cursor, notify cursor's current position.
         * (driver may already have been called if it also supports hardware pointers) */
        if (pdc->ppdev->devinfo.flGraphicsCaps & GCAPS_PANNING && y >= 0)
            pdc->ppdev->pfnMovePointer(pso, x, y - pso->sizlBitmap.cy, NULL);
    }

    /* Release PDEV lock */
    EngReleaseSemaphore(pdc->ppdev->hsemDevLock);

    /* Unlock the DC */
    DC_UnlockDc(pdc);
}


/* EOF */