/*
 * Copyright © 2003 Keith Packard
 *
 * 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, and that the name of Keith Packard not be used in
 * advertising or publicity pertaining to distribution of the software without
 * specific, written prior permission.  Keith Packard makes no
 * representations about the suitability of this software for any purpose.  It
 * is provided "as is" without express or implied warranty.
 *
 * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL KEITH PACKARD 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.
 */

#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif

#include <stdlib.h>

#include    <X11/X.h>
#include    "scrnintstr.h"
#include    "windowstr.h"
#include    <X11/fonts/font.h>
#include    "dixfontstr.h"
#include    <X11/fonts/fontstruct.h>
#include    "mi.h"
#include    "regionstr.h"
#include    "globals.h"
#include    "gcstruct.h"
#include    "damage.h"
#include    "damagestr.h"
#ifdef COMPOSITE
#include    "cw.h"
#endif

#define wrap(priv, real, mem, func) {\
    priv->mem = real->mem; \
    real->mem = func; \
}

#define unwrap(priv, real, mem) {\
    real->mem = priv->mem; \
}

#define BOX_SAME(a,b) \
    ((a)->x1 == (b)->x1 && \
     (a)->y1 == (b)->y1 && \
     (a)->x2 == (b)->x2 && \
     (a)->y2 == (b)->y2)

#define DAMAGE_VALIDATE_ENABLE 0
#define DAMAGE_DEBUG_ENABLE 0
#if DAMAGE_DEBUG_ENABLE
#define DAMAGE_DEBUG(x)	ErrorF x
#else
#define DAMAGE_DEBUG(x)
#endif

#define getPixmapDamageRef(pPixmap) ((DamagePtr *) \
    dixLookupPrivateAddr(&(pPixmap)->devPrivates, damagePixPrivateKey))

#define pixmapDamage(pPixmap)		damagePixPriv(pPixmap)

static DevPrivateKeyRec damageScrPrivateKeyRec;
#define damageScrPrivateKey (&damageScrPrivateKeyRec)
static DevPrivateKeyRec damagePixPrivateKeyRec;
#define damagePixPrivateKey (&damagePixPrivateKeyRec)
static DevPrivateKeyRec damageGCPrivateKeyRec;
#define damageGCPrivateKey (&damageGCPrivateKeyRec)
static DevPrivateKeyRec damageWinPrivateKeyRec;
#define damageWinPrivateKey (&damageWinPrivateKeyRec)

static DamagePtr *
getDrawableDamageRef (DrawablePtr pDrawable)
{
    PixmapPtr   pPixmap;
    
    if (WindowDrawable(pDrawable->type))
    {
	ScreenPtr   pScreen = pDrawable->pScreen;

	pPixmap = 0;
	if (pScreen->GetWindowPixmap)
	    pPixmap = (*pScreen->GetWindowPixmap) ((WindowPtr)pDrawable);

	if (!pPixmap)
	{
	    damageScrPriv(pScreen);

	    return &pScrPriv->pScreenDamage;
	}
    }
    else
	pPixmap = (PixmapPtr) pDrawable;
    return getPixmapDamageRef (pPixmap);
}

#define getDrawableDamage(pDrawable)	(*getDrawableDamageRef (pDrawable))
#define getWindowDamage(pWin)		getDrawableDamage(&(pWin)->drawable)

#define drawableDamage(pDrawable)	\
    DamagePtr	pDamage = getDrawableDamage(pDrawable)

#define windowDamage(pWin)		drawableDamage(&(pWin)->drawable)

#define winDamageRef(pWindow) \
    DamagePtr	*pPrev = (DamagePtr *) \
	dixLookupPrivateAddr(&(pWindow)->devPrivates, damageWinPrivateKey)

static void
damageReportDamage (DamagePtr pDamage, RegionPtr pDamageRegion)
{
    BoxRec tmpBox;
    RegionRec tmpRegion;
    Bool was_empty;

    switch (pDamage->damageLevel) {
    case DamageReportRawRegion:
	RegionUnion(&pDamage->damage, &pDamage->damage,
			 pDamageRegion);
	(*pDamage->damageReport) (pDamage, pDamageRegion, pDamage->closure);
	break;
    case DamageReportDeltaRegion:
	RegionNull(&tmpRegion);
	RegionSubtract(&tmpRegion, pDamageRegion, &pDamage->damage);
	if (RegionNotEmpty(&tmpRegion)) {
	    RegionUnion(&pDamage->damage, &pDamage->damage,
			 pDamageRegion);
	    (*pDamage->damageReport) (pDamage, &tmpRegion, pDamage->closure);
	}
	RegionUninit(&tmpRegion);
	break;
    case DamageReportBoundingBox:
	tmpBox = *RegionExtents(&pDamage->damage);
	RegionUnion(&pDamage->damage, &pDamage->damage,
		     pDamageRegion);
	if (!BOX_SAME (&tmpBox, RegionExtents(&pDamage->damage))) {
	    (*pDamage->damageReport) (pDamage, &pDamage->damage,
				      pDamage->closure);
	}
	break;
    case DamageReportNonEmpty:
	was_empty = !RegionNotEmpty(&pDamage->damage);
	RegionUnion(&pDamage->damage, &pDamage->damage,
		     pDamageRegion);
	if (was_empty && RegionNotEmpty(&pDamage->damage)) {
	    (*pDamage->damageReport) (pDamage, &pDamage->damage,
				      pDamage->closure);
	}
	break;
    case DamageReportNone:
	RegionUnion(&pDamage->damage, &pDamage->damage,
		     pDamageRegion);
	break;
    }
}

static void
damageReportDamagePostRendering (DamagePtr pDamage, RegionPtr pOldDamage, RegionPtr pDamageRegion)
{
    BoxRec tmpBox;
    RegionRec tmpRegion, newDamage;
    Bool was_empty;

    RegionUnion(&newDamage, pOldDamage, pDamageRegion);

    switch (pDamage->damageLevel) {
    case DamageReportRawRegion:
	(*pDamage->damageReportPostRendering) (pDamage, pDamageRegion, pDamage->closure);
	break;
    case DamageReportDeltaRegion:
	RegionNull(&tmpRegion);
	RegionSubtract(&tmpRegion, pDamageRegion, pOldDamage);
	if (RegionNotEmpty(&tmpRegion)) {
	    (*pDamage->damageReportPostRendering) (pDamage, &tmpRegion, pDamage->closure);
	}
	RegionUninit(&tmpRegion);
	break;
    case DamageReportBoundingBox:
	tmpBox = *RegionExtents(pOldDamage);
	if (!BOX_SAME (&tmpBox, RegionExtents(&newDamage))) {
	    (*pDamage->damageReportPostRendering) (pDamage, &newDamage,
				      pDamage->closure);
	}
	break;
    case DamageReportNonEmpty:
	was_empty = !RegionNotEmpty(pOldDamage);
	if (was_empty && RegionNotEmpty(&newDamage)) {
	    (*pDamage->damageReportPostRendering) (pDamage, &newDamage,
				      pDamage->closure);
	}
	break;
    case DamageReportNone:
	break;
    }

    RegionUninit(&newDamage);
}

#if DAMAGE_DEBUG_ENABLE
static void
_damageRegionAppend (DrawablePtr pDrawable, RegionPtr pRegion, Bool clip, int subWindowMode, const char *where)
#define damageRegionAppend(d,r,c,m) _damageRegionAppend(d,r,c,m,__FUNCTION__)
#else
static void
damageRegionAppend (DrawablePtr pDrawable, RegionPtr pRegion, Bool clip,
			int subWindowMode)
#endif
{
    ScreenPtr	    pScreen = pDrawable->pScreen;
    damageScrPriv(pScreen);
    drawableDamage(pDrawable);
    DamagePtr	    pNext;
    RegionRec	    clippedRec;
    RegionPtr	    pDamageRegion;
    RegionRec	    pixClip;
    int		    draw_x, draw_y;
#ifdef COMPOSITE
    int		    screen_x = 0, screen_y = 0;
#endif

    /* short circuit for empty regions */
    if (!RegionNotEmpty(pRegion))
	return;
    
#ifdef COMPOSITE
    /*
     * When drawing to a pixmap which is storing window contents,
     * the region presented is in pixmap relative coordinates which
     * need to be converted to screen relative coordinates
     */
    if (pDrawable->type != DRAWABLE_WINDOW)
    {
	screen_x = ((PixmapPtr) pDrawable)->screen_x - pDrawable->x;
	screen_y = ((PixmapPtr) pDrawable)->screen_y - pDrawable->y;
    }
    if (screen_x || screen_y)
        RegionTranslate(pRegion, screen_x, screen_y);
#endif
	
    if (pDrawable->type == DRAWABLE_WINDOW &&
	((WindowPtr)(pDrawable))->backingStore == NotUseful)
    {
	if (subWindowMode == ClipByChildren)
	{
	    RegionIntersect(pRegion, pRegion,
			     &((WindowPtr)(pDrawable))->clipList);
	}
	else if (subWindowMode == IncludeInferiors)
	{
	    RegionPtr pTempRegion =
		NotClippedByChildren((WindowPtr)(pDrawable));
	    RegionIntersect(pRegion, pRegion, pTempRegion);
	    RegionDestroy(pTempRegion);
	}
	/* If subWindowMode is set to an invalid value, don't perform
	 * any drawable-based clipping. */
    }
        

    RegionNull(&clippedRec);
    for (; pDamage; pDamage = pNext)
    {
	pNext = pDamage->pNext;
	/*
	 * Check for internal damage and don't send events
	 */
	if (pScrPriv->internalLevel > 0 && !pDamage->isInternal)
	{
	    DAMAGE_DEBUG (("non internal damage, skipping at %d\n",
			   pScrPriv->internalLevel));
	    continue;
	}
	/*
	 * Check for unrealized windows
	 */
	if (pDamage->pDrawable->type == DRAWABLE_WINDOW &&
	    !((WindowPtr) (pDamage->pDrawable))->realized)
	{
	    continue;
	}
	
	draw_x = pDamage->pDrawable->x;
	draw_y = pDamage->pDrawable->y;
#ifdef COMPOSITE
	/*
	 * Need to move everyone to screen coordinates
	 * XXX what about off-screen pixmaps with non-zero x/y?
	 */
	if (!WindowDrawable(pDamage->pDrawable->type))
	{
	    draw_x += ((PixmapPtr) pDamage->pDrawable)->screen_x;
	    draw_y += ((PixmapPtr) pDamage->pDrawable)->screen_y;
	}
#endif
	
	/*
	 * Clip against border or pixmap bounds
	 */
	
	pDamageRegion = pRegion;
	if (clip || pDamage->pDrawable != pDrawable)
	{
	    pDamageRegion = &clippedRec;
	    if (pDamage->pDrawable->type == DRAWABLE_WINDOW) {
		RegionIntersect(pDamageRegion, pRegion,
		    &((WindowPtr)(pDamage->pDrawable))->borderClip);
	    } else {
		BoxRec	box;
		box.x1 = draw_x;
		box.y1 = draw_y;
		box.x2 = draw_x + pDamage->pDrawable->width;
		box.y2 = draw_y + pDamage->pDrawable->height;
		RegionInit(&pixClip, &box, 1);
		RegionIntersect(pDamageRegion, pRegion, &pixClip);
		RegionUninit(&pixClip);
	    }
	    /*
	     * Short circuit empty results
	     */
	    if (!RegionNotEmpty(pDamageRegion))
		continue;
	}
	
	DAMAGE_DEBUG (("%s %d x %d +%d +%d (target 0x%lx monitor 0x%lx)\n",
		       where,
		       pDamageRegion->extents.x2 - pDamageRegion->extents.x1,
		       pDamageRegion->extents.y2 - pDamageRegion->extents.y1,
		       pDamageRegion->extents.x1, pDamageRegion->extents.y1,
		       pDrawable->id, pDamage->pDrawable->id));
	
	/*
	 * Move region to target coordinate space
	 */
	if (draw_x || draw_y)
	    RegionTranslate(pDamageRegion, -draw_x, -draw_y);

	/* Store damage region if needed after submission. */
	if (pDamage->reportAfter || pDamage->damageMarker)
	    RegionUnion(&pDamage->pendingDamage,
			 &pDamage->pendingDamage, pDamageRegion);

	/* Duplicate current damage if needed. */
	if (pDamage->damageMarker)
	    RegionCopy(&pDamage->backupDamage, &pDamage->damage);

	/* Report damage now, if desired. */
	if (!pDamage->reportAfter) {
	    if (pDamage->damageReport)
		damageReportDamage (pDamage, pDamageRegion);
	    else
		RegionUnion(&pDamage->damage,
			 &pDamage->damage, pDamageRegion);
	}

	/*
	 * translate original region back
	 */
	if (pDamageRegion == pRegion && (draw_x || draw_y))
	    RegionTranslate(pDamageRegion, draw_x, draw_y);
    }
#ifdef COMPOSITE
    if (screen_x || screen_y)
	RegionTranslate(pRegion, -screen_x, -screen_y);
#endif
    
    RegionUninit(&clippedRec);
}

static void
damageRegionProcessPending (DrawablePtr pDrawable)
{
    drawableDamage(pDrawable);

    for (; pDamage != NULL; pDamage = pDamage->pNext)
    {
	/* submit damage marker whenever possible. */
	if (pDamage->damageMarker)
	    (*pDamage->damageMarker) (pDrawable, pDamage, &pDamage->backupDamage, &pDamage->pendingDamage, pDamage->closure);
	if (pDamage->reportAfter) {
	    /* It's possible that there is only interest in postRendering reporting. */
	    if (pDamage->damageReport)
		damageReportDamage (pDamage, &pDamage->pendingDamage);
	    else
		RegionUnion(&pDamage->damage, &pDamage->damage,
			&pDamage->pendingDamage);
	}

	if (pDamage->reportAfter || pDamage->damageMarker)
	    RegionEmpty(&pDamage->pendingDamage);
	if (pDamage->damageMarker)
	    RegionEmpty(&pDamage->backupDamage);
    }
    
}

#if DAMAGE_DEBUG_ENABLE
#define damageDamageBox(d,b,m) _damageDamageBox(d,b,m,__FUNCTION__)
static void
_damageDamageBox (DrawablePtr pDrawable, BoxPtr pBox, int subWindowMode, const char *where)
#else
static void
damageDamageBox (DrawablePtr pDrawable, BoxPtr pBox, int subWindowMode)
#endif
{
    RegionRec	region;

    RegionInit(&region, pBox, 1);
#if DAMAGE_DEBUG_ENABLE
    _damageRegionAppend (pDrawable, &region, TRUE, subWindowMode, where);
#else
    damageRegionAppend (pDrawable, &region, TRUE, subWindowMode);
#endif
    RegionUninit(&region);
}

static void damageValidateGC(GCPtr, unsigned long, DrawablePtr);
static void damageChangeGC(GCPtr, unsigned long);
static void damageCopyGC(GCPtr, unsigned long, GCPtr);
static void damageDestroyGC(GCPtr);
static void damageChangeClip(GCPtr, int, pointer, int);
static void damageDestroyClip(GCPtr);
static void damageCopyClip(GCPtr, GCPtr);

static GCFuncs damageGCFuncs = {
    damageValidateGC, damageChangeGC, damageCopyGC, damageDestroyGC,
    damageChangeClip, damageDestroyClip, damageCopyClip
};

static GCOps damageGCOps;

static Bool
damageCreateGC(GCPtr pGC)
{
    ScreenPtr pScreen = pGC->pScreen;
    damageScrPriv(pScreen);
    damageGCPriv(pGC);
    Bool ret;

    unwrap (pScrPriv, pScreen, CreateGC);
    if((ret = (*pScreen->CreateGC) (pGC))) {
	pGCPriv->ops = NULL;
	pGCPriv->funcs = pGC->funcs;
	pGC->funcs = &damageGCFuncs;
    }
    wrap (pScrPriv, pScreen, CreateGC, damageCreateGC);

    return ret;
}

#define DAMAGE_GC_OP_PROLOGUE(pGC, pDrawable) \
    damageGCPriv(pGC);  \
    GCFuncs *oldFuncs = pGC->funcs; \
    unwrap(pGCPriv, pGC, funcs);  \
    unwrap(pGCPriv, pGC, ops); \

#define DAMAGE_GC_OP_EPILOGUE(pGC, pDrawable) \
    wrap(pGCPriv, pGC, funcs, oldFuncs); \
    wrap(pGCPriv, pGC, ops, &damageGCOps)

#define DAMAGE_GC_FUNC_PROLOGUE(pGC) \
    damageGCPriv(pGC); \
    unwrap(pGCPriv, pGC, funcs); \
    if (pGCPriv->ops) unwrap(pGCPriv, pGC, ops)

#define DAMAGE_GC_FUNC_EPILOGUE(pGC) \
    wrap(pGCPriv, pGC, funcs, &damageGCFuncs);  \
    if (pGCPriv->ops) wrap(pGCPriv, pGC, ops, &damageGCOps)

static void
damageValidateGC(GCPtr         pGC,
		 unsigned long changes,
		 DrawablePtr   pDrawable)
{
    DAMAGE_GC_FUNC_PROLOGUE (pGC);
    (*pGC->funcs->ValidateGC)(pGC, changes, pDrawable);
    pGCPriv->ops = pGC->ops;  /* just so it's not NULL */
    DAMAGE_GC_FUNC_EPILOGUE (pGC);
}

static void
damageDestroyGC(GCPtr pGC)
{
    DAMAGE_GC_FUNC_PROLOGUE (pGC);
    (*pGC->funcs->DestroyGC)(pGC);
    DAMAGE_GC_FUNC_EPILOGUE (pGC);
}

static void
damageChangeGC (GCPtr		pGC,
		unsigned long   mask)
{
    DAMAGE_GC_FUNC_PROLOGUE (pGC);
    (*pGC->funcs->ChangeGC) (pGC, mask);
    DAMAGE_GC_FUNC_EPILOGUE (pGC);
}

static void
damageCopyGC (GCPtr	    pGCSrc,
	      unsigned long mask,
	      GCPtr	    pGCDst)
{
    DAMAGE_GC_FUNC_PROLOGUE (pGCDst);
    (*pGCDst->funcs->CopyGC) (pGCSrc, mask, pGCDst);
    DAMAGE_GC_FUNC_EPILOGUE (pGCDst);
}

static void
damageChangeClip (GCPtr	    pGC,
		  int	    type,
		  pointer   pvalue,
		  int	    nrects)
{
    DAMAGE_GC_FUNC_PROLOGUE (pGC);
    (*pGC->funcs->ChangeClip) (pGC, type, pvalue, nrects);
    DAMAGE_GC_FUNC_EPILOGUE (pGC);
}

static void
damageCopyClip(GCPtr pgcDst, GCPtr pgcSrc)
{
    DAMAGE_GC_FUNC_PROLOGUE (pgcDst);
    (* pgcDst->funcs->CopyClip)(pgcDst, pgcSrc);
    DAMAGE_GC_FUNC_EPILOGUE (pgcDst);
}

static void
damageDestroyClip(GCPtr pGC)
{
    DAMAGE_GC_FUNC_PROLOGUE (pGC);
    (* pGC->funcs->DestroyClip)(pGC);
    DAMAGE_GC_FUNC_EPILOGUE (pGC);
}

#define TRIM_BOX(box, pGC) if (pGC->pCompositeClip) { \
    BoxPtr extents = &pGC->pCompositeClip->extents;\
    if(box.x1 < extents->x1) box.x1 = extents->x1; \
    if(box.x2 > extents->x2) box.x2 = extents->x2; \
    if(box.y1 < extents->y1) box.y1 = extents->y1; \
    if(box.y2 > extents->y2) box.y2 = extents->y2; \
    }

#define TRANSLATE_BOX(box, pDrawable) { \
    box.x1 += pDrawable->x; \
    box.x2 += pDrawable->x; \
    box.y1 += pDrawable->y; \
    box.y2 += pDrawable->y; \
    }

#define TRIM_AND_TRANSLATE_BOX(box, pDrawable, pGC) { \
    TRANSLATE_BOX(box, pDrawable); \
    TRIM_BOX(box, pGC); \
    }

#define BOX_NOT_EMPTY(box) \
    (((box.x2 - box.x1) > 0) && ((box.y2 - box.y1) > 0))

#define checkGCDamage(d,g)	(getDrawableDamage(d) && \
				 (!g->pCompositeClip ||\
				  RegionNotEmpty(g->pCompositeClip)))

#define TRIM_PICTURE_BOX(box, pDst) { \
    BoxPtr extents = &pDst->pCompositeClip->extents;\
    if(box.x1 < extents->x1) box.x1 = extents->x1; \
    if(box.x2 > extents->x2) box.x2 = extents->x2; \
    if(box.y1 < extents->y1) box.y1 = extents->y1; \
    if(box.y2 > extents->y2) box.y2 = extents->y2; \
    }
    
#define checkPictureDamage(p)	(getDrawableDamage(p->pDrawable) && \
				 RegionNotEmpty(p->pCompositeClip))

static void
damageComposite (CARD8      op,
		   PicturePtr pSrc,
		   PicturePtr pMask,
		   PicturePtr pDst,
		   INT16      xSrc,
		   INT16      ySrc,
		   INT16      xMask,
		   INT16      yMask,
		   INT16      xDst,
		   INT16      yDst,
		   CARD16     width,
		   CARD16     height)
{
    ScreenPtr		pScreen = pDst->pDrawable->pScreen;
    PictureScreenPtr	ps = GetPictureScreen(pScreen);
    damageScrPriv(pScreen);

    if (checkPictureDamage (pDst))
    {
	BoxRec	box;

	box.x1 = xDst + pDst->pDrawable->x;
	box.y1 = yDst + pDst->pDrawable->y;
	box.x2 = box.x1 + width;
	box.y2 = box.y1 + height;
	TRIM_PICTURE_BOX(box, pDst);
	if (BOX_NOT_EMPTY(box))
	    damageDamageBox (pDst->pDrawable, &box, pDst->subWindowMode);
    }
    unwrap (pScrPriv, ps, Composite);
    (*ps->Composite) (op,
		       pSrc,
		       pMask,
		       pDst,
		       xSrc,
		       ySrc,
		       xMask,
		       yMask,
		       xDst,
		       yDst,
		       width,
		       height);
    damageRegionProcessPending (pDst->pDrawable);
    wrap (pScrPriv, ps, Composite, damageComposite);
}

static void
damageGlyphs (CARD8		op,
		PicturePtr	pSrc,
		PicturePtr	pDst,
		PictFormatPtr	maskFormat,
		INT16		xSrc,
		INT16		ySrc,
		int		nlist,
		GlyphListPtr	list,
		GlyphPtr	*glyphs)
{
    ScreenPtr		pScreen = pDst->pDrawable->pScreen;
    PictureScreenPtr	ps = GetPictureScreen(pScreen);
    damageScrPriv(pScreen);

    if (checkPictureDamage (pDst))
    {
	int		nlistTmp = nlist;
	GlyphListPtr	listTmp = list;
	GlyphPtr	*glyphsTmp = glyphs;
	int		x, y;
	int		n;
	GlyphPtr	glyph;
	BoxRec		box;
	int		x1, y1, x2, y2;

	box.x1 = 32767;
	box.y1 = 32767;
	box.x2 = -32767;
	box.y2 = -32767;
	x = pDst->pDrawable->x;
	y = pDst->pDrawable->y;
	while (nlistTmp--)
	{
	    x += listTmp->xOff;
	    y += listTmp->yOff;
	    n = listTmp->len;
	    while (n--)
	    {
		glyph = *glyphsTmp++;
		x1 = x - glyph->info.x;
		y1 = y - glyph->info.y;
		x2 = x1 + glyph->info.width;
		y2 = y1 + glyph->info.height;
		if (x1 < box.x1)
		    box.x1 = x1;
		if (y1 < box.y1)
		    box.y1 = y1;
		if (x2 > box.x2)
		    box.x2 = x2;
		if (y2 > box.y2)
		    box.y2 = y2;
		x += glyph->info.xOff;
		y += glyph->info.yOff;
	    }
	    listTmp++;
	}
	TRIM_PICTURE_BOX (box, pDst);
	if (BOX_NOT_EMPTY(box))
	    damageDamageBox (pDst->pDrawable, &box, pDst->subWindowMode);
    }
    unwrap (pScrPriv, ps, Glyphs);
    (*ps->Glyphs) (op, pSrc, pDst, maskFormat, xSrc, ySrc, nlist, list, glyphs);
    damageRegionProcessPending (pDst->pDrawable);
    wrap (pScrPriv, ps, Glyphs, damageGlyphs);
}

static void
damageAddTraps (PicturePtr  pPicture,
		INT16	    x_off,
		INT16	    y_off,
		int	    ntrap,
		xTrap	    *traps)
{
    ScreenPtr		pScreen = pPicture->pDrawable->pScreen;
    PictureScreenPtr	ps = GetPictureScreen(pScreen);
    damageScrPriv(pScreen);

    if (checkPictureDamage (pPicture))
    {
	BoxRec	box;
	int	i;
	int	x, y;
	xTrap	*t = traps;

	box.x1 = 32767;
	box.y1 = 32767;
	box.x2 = -32767;
	box.y2 = -32767;
	x = pPicture->pDrawable->x + x_off;
	y = pPicture->pDrawable->y + y_off;
	for (i = 0; i < ntrap; i++)
	{
	    pixman_fixed_t   l = min (t->top.l, t->bot.l);
	    pixman_fixed_t   r = max (t->top.r, t->bot.r);
	    int	    x1 = x + pixman_fixed_to_int (l);
	    int	    x2 = x + pixman_fixed_to_int (pixman_fixed_ceil (r));
	    int	    y1 = y + pixman_fixed_to_int (t->top.y);
	    int	    y2 = y + pixman_fixed_to_int (pixman_fixed_ceil (t->bot.y));
	    
	    if (x1 < box.x1)
		box.x1 = x1;
	    if (x2 > box.x2)
		box.x2 = x2;
	    if (y1 < box.y1)
		box.y1 = y1;
	    if (y2 > box.y2)
		box.y2 = y2;
	}
	TRIM_PICTURE_BOX (box, pPicture);
	if (BOX_NOT_EMPTY(box))
	    damageDamageBox (pPicture->pDrawable, &box, pPicture->subWindowMode);
    }
    unwrap (pScrPriv, ps, AddTraps);
    (*ps->AddTraps) (pPicture, x_off, y_off, ntrap, traps);
    damageRegionProcessPending (pPicture->pDrawable);
    wrap (pScrPriv, ps, AddTraps, damageAddTraps);
}

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


static void
damageFillSpans(DrawablePtr pDrawable,
		GC	    *pGC,
		int	    npt,
		DDXPointPtr ppt,
		int	    *pwidth,
		int	    fSorted)
{
    DAMAGE_GC_OP_PROLOGUE(pGC, pDrawable);

    if (npt && checkGCDamage (pDrawable, pGC))
    {
	int	    nptTmp = npt;
	DDXPointPtr pptTmp = ppt;
	int	    *pwidthTmp = pwidth;
	BoxRec	    box;

	box.x1 = pptTmp->x;
	box.x2 = box.x1 + *pwidthTmp;
	box.y2 = box.y1 = pptTmp->y;

	while(--nptTmp) 
	{
	   pptTmp++;
	   pwidthTmp++;
	   if(box.x1 > pptTmp->x) box.x1 = pptTmp->x;
	   if(box.x2 < (pptTmp->x + *pwidthTmp))
		box.x2 = pptTmp->x + *pwidthTmp;
	   if(box.y1 > pptTmp->y) box.y1 = pptTmp->y;
	   else if(box.y2 < pptTmp->y) box.y2 = pptTmp->y;
	}

	box.y2++;

        if(!pGC->miTranslate) {
           TRANSLATE_BOX(box, pDrawable);
        }
        TRIM_BOX(box, pGC); 

	if(BOX_NOT_EMPTY(box))
	   damageDamageBox (pDrawable, &box, pGC->subWindowMode);
    }
    
    (*pGC->ops->FillSpans)(pDrawable, pGC, npt, ppt, pwidth, fSorted);

    damageRegionProcessPending (pDrawable);
    DAMAGE_GC_OP_EPILOGUE(pGC, pDrawable);
}

static void
damageSetSpans(DrawablePtr  pDrawable,
	       GCPtr	    pGC,
	       char	    *pcharsrc,
	       DDXPointPtr  ppt,
	       int	    *pwidth,
	       int	    npt,
	       int	    fSorted)
{
    DAMAGE_GC_OP_PROLOGUE(pGC, pDrawable);

    if (npt && checkGCDamage (pDrawable, pGC))
    {
	DDXPointPtr pptTmp = ppt;
	int	    *pwidthTmp = pwidth;
	int	    nptTmp = npt;
	BoxRec	    box;

	box.x1 = pptTmp->x;
	box.x2 = box.x1 + *pwidthTmp;
	box.y2 = box.y1 = pptTmp->y;

	while(--nptTmp) 
	{
	   pptTmp++;
	   pwidthTmp++;
	   if(box.x1 > pptTmp->x) box.x1 = pptTmp->x;
	   if(box.x2 < (pptTmp->x + *pwidthTmp))
		box.x2 = pptTmp->x + *pwidthTmp;
	   if(box.y1 > pptTmp->y) box.y1 = pptTmp->y;
	   else if(box.y2 < pptTmp->y) box.y2 = pptTmp->y;
	}

	box.y2++;

        if(!pGC->miTranslate) {
           TRANSLATE_BOX(box, pDrawable);
        }
        TRIM_BOX(box, pGC); 

	if(BOX_NOT_EMPTY(box))
	   damageDamageBox (pDrawable, &box, pGC->subWindowMode);
    }
    (*pGC->ops->SetSpans)(pDrawable, pGC, pcharsrc, ppt, pwidth, npt, fSorted);
    damageRegionProcessPending (pDrawable);
    DAMAGE_GC_OP_EPILOGUE(pGC, pDrawable);
}

static void
damagePutImage(DrawablePtr  pDrawable,
	       GCPtr	    pGC,
	       int	    depth,
	       int	    x,
	       int	    y,
	       int	    w,
	       int	    h,
	       int	    leftPad,
	       int	    format,
	       char	    *pImage)
{
    DAMAGE_GC_OP_PROLOGUE(pGC, pDrawable);
    if (checkGCDamage (pDrawable, pGC))
    {
	BoxRec box;

	box.x1 = x + pDrawable->x;
	box.x2 = box.x1 + w;
	box.y1 = y + pDrawable->y;
	box.y2 = box.y1 + h;

	TRIM_BOX(box, pGC);
	if(BOX_NOT_EMPTY(box))
	   damageDamageBox (pDrawable, &box, pGC->subWindowMode);
    }
    (*pGC->ops->PutImage)(pDrawable, pGC, depth, x, y, w, h,
		leftPad, format, pImage);
    damageRegionProcessPending (pDrawable);
    DAMAGE_GC_OP_EPILOGUE(pGC, pDrawable);
}

static RegionPtr
damageCopyArea(DrawablePtr   pSrc,
	       DrawablePtr  pDst,
	       GC	    *pGC,
	       int	    srcx,
	       int	    srcy,
	       int	    width,
	       int	    height,
	       int	    dstx,
	       int	    dsty)
{
    RegionPtr ret;
    DAMAGE_GC_OP_PROLOGUE(pGC, pDst);
    
    if (checkGCDamage (pDst, pGC))
    {
	BoxRec box;

	box.x1 = dstx + pDst->x;
	box.x2 = box.x1 + width;
	box.y1 = dsty + pDst->y;
	box.y2 = box.y1 + height;

	TRIM_BOX(box, pGC);
	if(BOX_NOT_EMPTY(box))
	   damageDamageBox (pDst, &box, pGC->subWindowMode);
    }

    ret = (*pGC->ops->CopyArea)(pSrc, pDst,
            pGC, srcx, srcy, width, height, dstx, dsty);
    damageRegionProcessPending (pDst);
    DAMAGE_GC_OP_EPILOGUE(pGC, pDst);
    return ret;
}

static RegionPtr
damageCopyPlane(DrawablePtr	pSrc,
		DrawablePtr	pDst,
		GCPtr		pGC,
		int		srcx,
		int		srcy,
		int		width,
		int		height,
		int		dstx,
		int		dsty,
		unsigned long	bitPlane)
{
    RegionPtr ret;
    DAMAGE_GC_OP_PROLOGUE(pGC, pDst);

    if (checkGCDamage (pDst, pGC))
    {
	BoxRec box;

	box.x1 = dstx + pDst->x;
	box.x2 = box.x1 + width;
	box.y1 = dsty + pDst->y;
	box.y2 = box.y1 + height;

	TRIM_BOX(box, pGC);
	if(BOX_NOT_EMPTY(box))
	   damageDamageBox (pDst, &box, pGC->subWindowMode);
    }

    ret = (*pGC->ops->CopyPlane)(pSrc, pDst,
	       pGC, srcx, srcy, width, height, dstx, dsty, bitPlane);
    damageRegionProcessPending (pDst);
    DAMAGE_GC_OP_EPILOGUE(pGC, pDst);
    return ret;
}

static void
damagePolyPoint(DrawablePtr pDrawable,
		GCPtr	    pGC,
		int	    mode,
		int	    npt,
		xPoint	    *ppt)
{
    DAMAGE_GC_OP_PROLOGUE(pGC, pDrawable);

    if (npt && checkGCDamage (pDrawable, pGC))
    {
	BoxRec	box;
	int	nptTmp = npt;
	xPoint	*pptTmp = ppt;

	box.x2 = box.x1 = pptTmp->x;
	box.y2 = box.y1 = pptTmp->y;

	/* this could be slow if the points were spread out */

	while(--nptTmp) 
	{
	   pptTmp++;
	   if(box.x1 > pptTmp->x) box.x1 = pptTmp->x;
	   else if(box.x2 < pptTmp->x) box.x2 = pptTmp->x;
	   if(box.y1 > pptTmp->y) box.y1 = pptTmp->y;
	   else if(box.y2 < pptTmp->y) box.y2 = pptTmp->y;
	}

	box.x2++;
	box.y2++;

	TRIM_AND_TRANSLATE_BOX(box, pDrawable, pGC);
	if(BOX_NOT_EMPTY(box))
	   damageDamageBox (pDrawable, &box, pGC->subWindowMode);
    }
    (*pGC->ops->PolyPoint)(pDrawable, pGC, mode, npt, ppt);
    damageRegionProcessPending (pDrawable);
    DAMAGE_GC_OP_EPILOGUE(pGC, pDrawable);
}

static void
damagePolylines(DrawablePtr pDrawable,
		GCPtr	    pGC,
		int	    mode,
		int	    npt,
		DDXPointPtr ppt)
{
    DAMAGE_GC_OP_PROLOGUE(pGC, pDrawable);

    if (npt && checkGCDamage (pDrawable, pGC))
    {
	int	    nptTmp = npt;
	DDXPointPtr pptTmp = ppt;
	BoxRec	    box;
	int	    extra = pGC->lineWidth >> 1;

	box.x2 = box.x1 = pptTmp->x;
	box.y2 = box.y1 = pptTmp->y;

	if(nptTmp > 1) 
	{
	   if(pGC->joinStyle == JoinMiter)
		extra = 6 * pGC->lineWidth;
	   else if(pGC->capStyle == CapProjecting)
		extra = pGC->lineWidth;
        }

	if(mode == CoordModePrevious) 
	{
	   int x = box.x1;
	   int y = box.y1;
	   while(--nptTmp) 
	   {
		pptTmp++;
		x += pptTmp->x;
		y += pptTmp->y;
		if(box.x1 > x) box.x1 = x;
		else if(box.x2 < x) box.x2 = x;
		if(box.y1 > y) box.y1 = y;
		else if(box.y2 < y) box.y2 = y;
	    }
	}
	else 
	{
	   while(--nptTmp) 
	   {
		pptTmp++;
		if(box.x1 > pptTmp->x) box.x1 = pptTmp->x;
		else if(box.x2 < pptTmp->x) box.x2 = pptTmp->x;
		if(box.y1 > pptTmp->y) box.y1 = pptTmp->y;
		else if(box.y2 < pptTmp->y) box.y2 = pptTmp->y;
	    }
	}

	box.x2++;
	box.y2++;

	if(extra) 
	{
	   box.x1 -= extra;
	   box.x2 += extra;
	   box.y1 -= extra;
	   box.y2 += extra;
        }

	TRIM_AND_TRANSLATE_BOX(box, pDrawable, pGC);
	if(BOX_NOT_EMPTY(box))
	   damageDamageBox (pDrawable, &box, pGC->subWindowMode);
    }
    (*pGC->ops->Polylines)(pDrawable, pGC, mode, npt, ppt);
    damageRegionProcessPending (pDrawable);
    DAMAGE_GC_OP_EPILOGUE(pGC, pDrawable);
}

static void
damagePolySegment(DrawablePtr	pDrawable,
		  GCPtr		pGC,
		  int		nSeg,
		  xSegment	*pSeg)
{
    DAMAGE_GC_OP_PROLOGUE(pGC, pDrawable);

    if (nSeg && checkGCDamage (pDrawable, pGC))
    {
	BoxRec	    box;
	int	    extra = pGC->lineWidth;
	int	    nsegTmp = nSeg;
	xSegment    *pSegTmp = pSeg;

        if(pGC->capStyle != CapProjecting)
	   extra >>= 1;

	if(pSegTmp->x2 > pSegTmp->x1) {
	    box.x1 = pSegTmp->x1;
	    box.x2 = pSegTmp->x2;
	} else {
	    box.x2 = pSegTmp->x1;
	    box.x1 = pSegTmp->x2;
	}

	if(pSegTmp->y2 > pSegTmp->y1) {
	    box.y1 = pSegTmp->y1;
	    box.y2 = pSegTmp->y2;
	} else {
	    box.y2 = pSegTmp->y1;
	    box.y1 = pSegTmp->y2;
	}

	while(--nsegTmp) 
	{
	    pSegTmp++;
	    if(pSegTmp->x2 > pSegTmp->x1) 
	    {
		if(pSegTmp->x1 < box.x1) box.x1 = pSegTmp->x1;
		if(pSegTmp->x2 > box.x2) box.x2 = pSegTmp->x2;
	    }
	    else 
	    {
		if(pSegTmp->x2 < box.x1) box.x1 = pSegTmp->x2;
		if(pSegTmp->x1 > box.x2) box.x2 = pSegTmp->x1;
	    }
	    if(pSegTmp->y2 > pSegTmp->y1) 
	    {
		if(pSegTmp->y1 < box.y1) box.y1 = pSegTmp->y1;
		if(pSegTmp->y2 > box.y2) box.y2 = pSegTmp->y2;
	    }
	    else
	    {
		if(pSegTmp->y2 < box.y1) box.y1 = pSegTmp->y2;
		if(pSegTmp->y1 > box.y2) box.y2 = pSegTmp->y1;
	    }
	}

	box.x2++;
	box.y2++;

	if(extra) 
	{
	   box.x1 -= extra;
	   box.x2 += extra;
	   box.y1 -= extra;
	   box.y2 += extra;
        }

	TRIM_AND_TRANSLATE_BOX(box, pDrawable, pGC);
	if(BOX_NOT_EMPTY(box))
	   damageDamageBox (pDrawable, &box, pGC->subWindowMode);
    }
    (*pGC->ops->PolySegment)(pDrawable, pGC, nSeg, pSeg);
    damageRegionProcessPending (pDrawable);
    DAMAGE_GC_OP_EPILOGUE(pGC, pDrawable);
}

static void
damagePolyRectangle(DrawablePtr  pDrawable,
		    GCPtr        pGC,
		    int	         nRects,
		    xRectangle  *pRects)
{
    DAMAGE_GC_OP_PROLOGUE(pGC, pDrawable);

    if (nRects && checkGCDamage (pDrawable, pGC))
    {
	BoxRec	    box;
	int	    offset1, offset2, offset3;
	int	    nRectsTmp = nRects;
	xRectangle  *pRectsTmp = pRects;

	offset2 = pGC->lineWidth;
	if(!offset2) offset2 = 1;
	offset1 = offset2 >> 1;
	offset3 = offset2 - offset1;

	while(nRectsTmp--)
	{
	    box.x1 = pRectsTmp->x - offset1;
	    box.y1 = pRectsTmp->y - offset1;
	    box.x2 = box.x1 + pRectsTmp->width + offset2;
	    box.y2 = box.y1 + offset2;
	    TRIM_AND_TRANSLATE_BOX(box, pDrawable, pGC);
	    if(BOX_NOT_EMPTY(box))
		damageDamageBox (pDrawable, &box, pGC->subWindowMode);

	    box.x1 = pRectsTmp->x - offset1;
	    box.y1 = pRectsTmp->y + offset3;
	    box.x2 = box.x1 + offset2;
	    box.y2 = box.y1 + pRectsTmp->height - offset2;
	    TRIM_AND_TRANSLATE_BOX(box, pDrawable, pGC);
	    if(BOX_NOT_EMPTY(box))
		damageDamageBox (pDrawable, &box, pGC->subWindowMode);

	    box.x1 = pRectsTmp->x + pRectsTmp->width - offset1;
	    box.y1 = pRectsTmp->y + offset3;
	    box.x2 = box.x1 + offset2;
	    box.y2 = box.y1 + pRectsTmp->height - offset2;
	    TRIM_AND_TRANSLATE_BOX(box, pDrawable, pGC);
	    if(BOX_NOT_EMPTY(box))
		damageDamageBox (pDrawable, &box, pGC->subWindowMode);

	    box.x1 = pRectsTmp->x - offset1;
	    box.y1 = pRectsTmp->y + pRectsTmp->height - offset1;
	    box.x2 = box.x1 + pRectsTmp->width + offset2;
	    box.y2 = box.y1 + offset2;
	    TRIM_AND_TRANSLATE_BOX(box, pDrawable, pGC);
	    if(BOX_NOT_EMPTY(box))
		damageDamageBox (pDrawable, &box, pGC->subWindowMode);

	    pRectsTmp++;
	}
    }
    (*pGC->ops->PolyRectangle)(pDrawable, pGC, nRects, pRects);
    damageRegionProcessPending (pDrawable);
    DAMAGE_GC_OP_EPILOGUE(pGC, pDrawable);
}

static void
damagePolyArc(DrawablePtr   pDrawable,
	      GCPtr	    pGC,
	      int	    nArcs,
	      xArc	    *pArcs)
{
    DAMAGE_GC_OP_PROLOGUE(pGC, pDrawable);

    if (nArcs && checkGCDamage (pDrawable, pGC))
    {
	int	extra = pGC->lineWidth >> 1;
	BoxRec	box;
	int	nArcsTmp = nArcs;
	xArc	*pArcsTmp = pArcs;

	box.x1 = pArcsTmp->x;
	box.x2 = box.x1 + pArcsTmp->width;
	box.y1 = pArcsTmp->y;
	box.y2 = box.y1 + pArcsTmp->height;

	while(--nArcsTmp) 
	{
	    pArcsTmp++;
	    if(box.x1 > pArcsTmp->x)
		box.x1 = pArcsTmp->x;
	    if(box.x2 < (pArcsTmp->x + pArcsTmp->width))
		box.x2 = pArcsTmp->x + pArcsTmp->width;
	    if(box.y1 > pArcsTmp->y) 
		box.y1 = pArcsTmp->y;
	    if(box.y2 < (pArcsTmp->y + pArcsTmp->height))
		box.y2 = pArcsTmp->y + pArcsTmp->height;
        }

	if(extra) 
	{
	   box.x1 -= extra;
	   box.x2 += extra;
	   box.y1 -= extra;
	   box.y2 += extra;
        }

	box.x2++;
	box.y2++;

	TRIM_AND_TRANSLATE_BOX(box, pDrawable, pGC);
	if(BOX_NOT_EMPTY(box))
	   damageDamageBox (pDrawable, &box, pGC->subWindowMode);
    }
    (*pGC->ops->PolyArc)(pDrawable, pGC, nArcs, pArcs);
    damageRegionProcessPending (pDrawable);
    DAMAGE_GC_OP_EPILOGUE(pGC, pDrawable);
}

static void
damageFillPolygon(DrawablePtr	pDrawable,
		  GCPtr		pGC,
		  int		shape,
		  int		mode,
		  int		npt,
		  DDXPointPtr	ppt)
{
    DAMAGE_GC_OP_PROLOGUE(pGC, pDrawable);

    if (npt > 2 && checkGCDamage (pDrawable, pGC))
    {
	DDXPointPtr pptTmp = ppt;
	int	    nptTmp = npt;
	BoxRec	    box;

	box.x2 = box.x1 = pptTmp->x;
	box.y2 = box.y1 = pptTmp->y;

	if(mode != CoordModeOrigin) 
	{
	   int x = box.x1;
	   int y = box.y1;
	   while(--nptTmp) 
	   {
		pptTmp++;
		x += pptTmp->x;
		y += pptTmp->y;
		if(box.x1 > x) box.x1 = x;
		else if(box.x2 < x) box.x2 = x;
		if(box.y1 > y) box.y1 = y;
		else if(box.y2 < y) box.y2 = y;
	    }
	}
	else 
	{
	   while(--nptTmp) 
	   {
		pptTmp++;
		if(box.x1 > pptTmp->x) box.x1 = pptTmp->x;
		else if(box.x2 < pptTmp->x) box.x2 = pptTmp->x;
		if(box.y1 > pptTmp->y) box.y1 = pptTmp->y;
		else if(box.y2 < pptTmp->y) box.y2 = pptTmp->y;
	    }
	}

	box.x2++;
	box.y2++;

	TRIM_AND_TRANSLATE_BOX(box, pDrawable, pGC);
	if(BOX_NOT_EMPTY(box))
	   damageDamageBox (pDrawable, &box, pGC->subWindowMode);
    }
    
    (*pGC->ops->FillPolygon)(pDrawable, pGC, shape, mode, npt, ppt);
    damageRegionProcessPending (pDrawable);
    DAMAGE_GC_OP_EPILOGUE(pGC, pDrawable);
}


static void
damagePolyFillRect(DrawablePtr	pDrawable,
		   GCPtr	pGC,
		   int		nRects,
		   xRectangle	*pRects)
{
    DAMAGE_GC_OP_PROLOGUE(pGC, pDrawable);
    if (nRects && checkGCDamage (pDrawable, pGC))
    {
	BoxRec	    box;
	xRectangle  *pRectsTmp = pRects;
	int	    nRectsTmp = nRects;

	box.x1 = pRectsTmp->x;
	box.x2 = box.x1 + (short)pRectsTmp->width;
	box.y1 = pRectsTmp->y;
	box.y2 = box.y1 + (short)pRectsTmp->height;

	while(--nRectsTmp) 
	{
	    pRectsTmp++;
	    if(box.x1 > pRectsTmp->x) box.x1 = pRectsTmp->x;
	    if(box.x2 < (pRectsTmp->x + pRectsTmp->width))
		box.x2 = pRectsTmp->x + pRectsTmp->width;
	    if(box.y1 > pRectsTmp->y) box.y1 = pRectsTmp->y;
	    if(box.y2 < (pRectsTmp->y + pRectsTmp->height))
		box.y2 = pRectsTmp->y + pRectsTmp->height;
	}

	TRIM_AND_TRANSLATE_BOX(box, pDrawable, pGC);
	if(BOX_NOT_EMPTY(box))
	    damageDamageBox (pDrawable, &box, pGC->subWindowMode);
    }
    (*pGC->ops->PolyFillRect)(pDrawable, pGC, nRects, pRects);
    damageRegionProcessPending (pDrawable);
    DAMAGE_GC_OP_EPILOGUE(pGC, pDrawable);
}


static void
damagePolyFillArc(DrawablePtr	pDrawable,
		  GCPtr		pGC,
		  int		nArcs,
		  xArc		*pArcs)
{
    DAMAGE_GC_OP_PROLOGUE(pGC, pDrawable);

    if (nArcs && checkGCDamage (pDrawable, pGC))
    {
	BoxRec	box;
	int	nArcsTmp = nArcs;
	xArc	*pArcsTmp = pArcs;

	box.x1 = pArcsTmp->x;
	box.x2 = box.x1 + pArcsTmp->width;
	box.y1 = pArcsTmp->y;
	box.y2 = box.y1 + pArcsTmp->height;

	while(--nArcsTmp) 
	{
	    pArcsTmp++;
	    if(box.x1 > pArcsTmp->x)
		box.x1 = pArcsTmp->x;
	    if(box.x2 < (pArcsTmp->x + pArcsTmp->width))
		box.x2 = pArcsTmp->x + pArcsTmp->width;
	    if(box.y1 > pArcsTmp->y)
		box.y1 = pArcsTmp->y;
	    if(box.y2 < (pArcsTmp->y + pArcsTmp->height))
		box.y2 = pArcsTmp->y + pArcsTmp->height;
        }

	TRIM_AND_TRANSLATE_BOX(box, pDrawable, pGC);
	if(BOX_NOT_EMPTY(box))
	   damageDamageBox (pDrawable, &box, pGC->subWindowMode);
    }
    (*pGC->ops->PolyFillArc)(pDrawable, pGC, nArcs, pArcs);
    damageRegionProcessPending (pDrawable);
    DAMAGE_GC_OP_EPILOGUE(pGC, pDrawable);
}

/*
 * general Poly/Image text function.  Extract glyph information,
 * compute bounding box and remove cursor if it is overlapped.
 */

static void
damageDamageChars (DrawablePtr	pDrawable,
		   FontPtr	font,
		   int		x,
		   int		y,
		   unsigned int	n,
		   CharInfoPtr	*charinfo,
		   Bool		imageblt,
		   int		subWindowMode)
{
    ExtentInfoRec   extents;
    BoxRec	    box;

    QueryGlyphExtents(font, charinfo, n, &extents);
    if (imageblt)
    {
	if (extents.overallWidth > extents.overallRight)
	    extents.overallRight = extents.overallWidth;
	if (extents.overallWidth < extents.overallLeft)
	    extents.overallLeft = extents.overallWidth;
	if (extents.overallLeft > 0)
	    extents.overallLeft = 0;
	if (extents.fontAscent > extents.overallAscent)
	    extents.overallAscent = extents.fontAscent;
	if (extents.fontDescent > extents.overallDescent)
	    extents.overallDescent = extents.fontDescent;
    }
    box.x1 = x + extents.overallLeft;
    box.y1 = y - extents.overallAscent;
    box.x2 = x + extents.overallRight;
    box.y2 = y + extents.overallDescent;
    damageDamageBox (pDrawable, &box, subWindowMode);
}

/*
 * values for textType:
 */
#define TT_POLY8   0
#define TT_IMAGE8  1
#define TT_POLY16  2
#define TT_IMAGE16 3

static int 
damageText (DrawablePtr	    pDrawable,
	    GCPtr	    pGC,
	    int		    x,
	    int		    y,
	    unsigned long   count,
	    char	    *chars,
	    FontEncoding    fontEncoding,
	    Bool	    textType)
{
    CharInfoPtr	    *charinfo;
    CharInfoPtr	    *info;
    unsigned long   i;
    unsigned int    n;
    int		    w;
    Bool	    imageblt;

    imageblt = (textType == TT_IMAGE8) || (textType == TT_IMAGE16);

    charinfo = malloc(count * sizeof(CharInfoPtr));
    if (!charinfo)
	return x;

    GetGlyphs(pGC->font, count, (unsigned char *)chars,
	      fontEncoding, &i, charinfo);
    n = (unsigned int)i;
    w = 0;
    if (!imageblt)
	for (info = charinfo; i--; info++)
	    w += (*info)->metrics.characterWidth;

    if (n != 0) {
	damageDamageChars (pDrawable, pGC->font, x + pDrawable->x, y + pDrawable->y, n,
			   charinfo, imageblt, pGC->subWindowMode);
	if (imageblt)
	    (*pGC->ops->ImageGlyphBlt)(pDrawable, pGC, x, y, n, charinfo,
				       FONTGLYPHS(pGC->font));
	else
	    (*pGC->ops->PolyGlyphBlt)(pDrawable, pGC, x, y, n, charinfo,
				      FONTGLYPHS(pGC->font));
    }
    free(charinfo);
    return x + w;
}

static int
damagePolyText8(DrawablePtr pDrawable,
		GCPtr	    pGC,
		int	    x,
		int	    y,
		int	    count,
		char	    *chars)
{
    DAMAGE_GC_OP_PROLOGUE(pGC, pDrawable);

    if (checkGCDamage (pDrawable, pGC))
	x = damageText (pDrawable, pGC, x, y, (unsigned long) count, chars,
		    Linear8Bit, TT_POLY8);
    else
	x = (*pGC->ops->PolyText8)(pDrawable, pGC, x, y, count, chars);
    damageRegionProcessPending (pDrawable);
    DAMAGE_GC_OP_EPILOGUE(pGC, pDrawable);
    return x;
}

static int
damagePolyText16(DrawablePtr	pDrawable,
		 GCPtr		pGC,
		 int		x,
		 int		y,
		 int		count,
		 unsigned short	*chars)
{
    DAMAGE_GC_OP_PROLOGUE(pGC, pDrawable);

    if (checkGCDamage (pDrawable, pGC))
	x = damageText (pDrawable, pGC, x, y, (unsigned long) count, (char *) chars,
		    FONTLASTROW(pGC->font) == 0 ? Linear16Bit : TwoD16Bit,
		    TT_POLY16);
    else
	x = (*pGC->ops->PolyText16)(pDrawable, pGC, x, y, count, chars);
    damageRegionProcessPending (pDrawable);
    DAMAGE_GC_OP_EPILOGUE(pGC, pDrawable);
    return x;
}

static void
damageImageText8(DrawablePtr	pDrawable,
		 GCPtr		pGC,
		 int		x,
		 int		y,
		 int		count,
		 char		*chars)
{
    DAMAGE_GC_OP_PROLOGUE(pGC, pDrawable);

    if (checkGCDamage (pDrawable, pGC))
	damageText (pDrawable, pGC, x, y, (unsigned long) count, chars,
		    Linear8Bit, TT_IMAGE8);
    else
	(*pGC->ops->ImageText8)(pDrawable, pGC, x, y, count, chars);
    damageRegionProcessPending (pDrawable);
    DAMAGE_GC_OP_EPILOGUE(pGC, pDrawable);
}

static void
damageImageText16(DrawablePtr	pDrawable,
		  GCPtr		pGC,
		  int		x,
		  int		y,
		  int		count,
		  unsigned short *chars)
{
    DAMAGE_GC_OP_PROLOGUE(pGC, pDrawable);

    if (checkGCDamage (pDrawable, pGC))
	damageText (pDrawable, pGC, x, y, (unsigned long) count, (char *) chars,
		    FONTLASTROW(pGC->font) == 0 ? Linear16Bit : TwoD16Bit,
		    TT_IMAGE16);
    else
	(*pGC->ops->ImageText16)(pDrawable, pGC, x, y, count, chars);
    damageRegionProcessPending (pDrawable);
    DAMAGE_GC_OP_EPILOGUE(pGC, pDrawable);
}


static void
damageImageGlyphBlt(DrawablePtr	    pDrawable,
		    GCPtr	    pGC,
		    int		    x,
		    int		    y,
		    unsigned int    nglyph,
		    CharInfoPtr	    *ppci,
		    pointer	    pglyphBase)
{
    DAMAGE_GC_OP_PROLOGUE(pGC, pDrawable);
    damageDamageChars (pDrawable, pGC->font, x + pDrawable->x, y + pDrawable->y,
		       nglyph, ppci, TRUE, pGC->subWindowMode);
    (*pGC->ops->ImageGlyphBlt)(pDrawable, pGC, x, y, nglyph,
					ppci, pglyphBase);
    damageRegionProcessPending (pDrawable);
    DAMAGE_GC_OP_EPILOGUE(pGC, pDrawable);
}

static void
damagePolyGlyphBlt(DrawablePtr	pDrawable,
		   GCPtr	pGC,
		   int		x,
		   int		y,
		   unsigned int	nglyph,
		   CharInfoPtr	*ppci,
		   pointer	pglyphBase)
{
    DAMAGE_GC_OP_PROLOGUE(pGC, pDrawable);
    damageDamageChars (pDrawable, pGC->font, x + pDrawable->x, y + pDrawable->y,
		       nglyph, ppci, FALSE, pGC->subWindowMode);
    (*pGC->ops->PolyGlyphBlt)(pDrawable, pGC, x, y, nglyph,
				ppci, pglyphBase);
    damageRegionProcessPending (pDrawable);
    DAMAGE_GC_OP_EPILOGUE(pGC, pDrawable);
}

static void
damagePushPixels(GCPtr		pGC,
		 PixmapPtr	pBitMap,
		 DrawablePtr	pDrawable,
		 int		dx,
		 int		dy,
		 int		xOrg,
		 int		yOrg)
{
    DAMAGE_GC_OP_PROLOGUE(pGC, pDrawable);
    if(checkGCDamage (pDrawable, pGC))
    {
	BoxRec box;

        box.x1 = xOrg;
        box.y1 = yOrg;

        if(!pGC->miTranslate) {
           box.x1 += pDrawable->x;          
           box.y1 += pDrawable->y;          
        }

	box.x2 = box.x1 + dx;
	box.y2 = box.y1 + dy;

	TRIM_BOX(box, pGC);
	if(BOX_NOT_EMPTY(box))
	   damageDamageBox (pDrawable, &box, pGC->subWindowMode);
    }
    (*pGC->ops->PushPixels)(pGC, pBitMap, pDrawable, dx, dy, xOrg, yOrg);
    damageRegionProcessPending (pDrawable);
    DAMAGE_GC_OP_EPILOGUE(pGC, pDrawable);
}

static void
damageRemoveDamage (DamagePtr *pPrev, DamagePtr pDamage)
{
    while (*pPrev)
    {
	if (*pPrev == pDamage)
	{
	    *pPrev = pDamage->pNext;
	    return;
	}
	pPrev = &(*pPrev)->pNext;
    }
#if DAMAGE_VALIDATE_ENABLE
    ErrorF ("Damage not on list\n");
    OsAbort ();
#endif
}

static void
damageInsertDamage (DamagePtr *pPrev, DamagePtr pDamage)
{
#if DAMAGE_VALIDATE_ENABLE
    DamagePtr	pOld;

    for (pOld = *pPrev; pOld; pOld = pOld->pNext)
	if (pOld == pDamage) {
	    ErrorF ("Damage already on list\n");
	    OsAbort ();
	}
#endif
    pDamage->pNext = *pPrev;
    *pPrev = pDamage;
}

static Bool
damageDestroyPixmap (PixmapPtr pPixmap)
{
    ScreenPtr	pScreen = pPixmap->drawable.pScreen;
    damageScrPriv(pScreen);

    if (pPixmap->refcnt == 1)
    {
	DamagePtr	*pPrev = getPixmapDamageRef (pPixmap);
	DamagePtr	pDamage;

	while ((pDamage = *pPrev))
	{
	    damageRemoveDamage (pPrev, pDamage);
	    if (!pDamage->isWindow)
		DamageDestroy (pDamage);
	}
    }
    unwrap (pScrPriv, pScreen, DestroyPixmap);
    (*pScreen->DestroyPixmap) (pPixmap);
    wrap (pScrPriv, pScreen, DestroyPixmap, damageDestroyPixmap);
    return TRUE;
}

static void
damageCopyWindow(WindowPtr	pWindow,
		 DDXPointRec	ptOldOrg,
		 RegionPtr	prgnSrc)
{
    ScreenPtr pScreen = pWindow->drawable.pScreen;
    damageScrPriv(pScreen);

    if (getWindowDamage (pWindow))
    {
	int dx = pWindow->drawable.x - ptOldOrg.x;
	int dy = pWindow->drawable.y - ptOldOrg.y;
	
	/*
	 * The region comes in source relative, but the damage occurs
	 * at the destination location.  Translate back and forth.
	 */
	RegionTranslate(prgnSrc, dx, dy);
	damageRegionAppend (&pWindow->drawable, prgnSrc, FALSE, -1);
	RegionTranslate(prgnSrc, -dx, -dy);
    }
    unwrap (pScrPriv, pScreen, CopyWindow);
    (*pScreen->CopyWindow) (pWindow, ptOldOrg, prgnSrc);
    damageRegionProcessPending (&pWindow->drawable);
    wrap (pScrPriv, pScreen, CopyWindow, damageCopyWindow);
}

static GCOps damageGCOps = {
    damageFillSpans, damageSetSpans,
    damagePutImage, damageCopyArea,
    damageCopyPlane, damagePolyPoint,
    damagePolylines, damagePolySegment,
    damagePolyRectangle, damagePolyArc,
    damageFillPolygon, damagePolyFillRect,
    damagePolyFillArc, damagePolyText8,
    damagePolyText16, damageImageText8,
    damageImageText16, damageImageGlyphBlt,
    damagePolyGlyphBlt, damagePushPixels,
};

static void
damageSetWindowPixmap (WindowPtr pWindow, PixmapPtr pPixmap)
{
    DamagePtr	pDamage;
    ScreenPtr	pScreen = pWindow->drawable.pScreen;
    damageScrPriv(pScreen);

    if ((pDamage = damageGetWinPriv(pWindow)))
    {
	PixmapPtr   pOldPixmap = (*pScreen->GetWindowPixmap) (pWindow);
	DamagePtr   *pPrev = getPixmapDamageRef(pOldPixmap);
	
	while (pDamage)
	{
	    damageRemoveDamage (pPrev, pDamage);
	    pDamage = pDamage->pNextWin;
	}
    }
    unwrap (pScrPriv, pScreen, SetWindowPixmap);
    (*pScreen->SetWindowPixmap) (pWindow, pPixmap);
    wrap (pScrPriv, pScreen, SetWindowPixmap, damageSetWindowPixmap);
    if ((pDamage = damageGetWinPriv(pWindow)))
    {
	DamagePtr   *pPrev = getPixmapDamageRef(pPixmap);
	
	while (pDamage)
	{
	    damageInsertDamage (pPrev, pDamage);
	    pDamage = pDamage->pNextWin;
	}
    }
}

static Bool
damageDestroyWindow (WindowPtr pWindow)
{
    DamagePtr	pDamage;
    ScreenPtr	pScreen = pWindow->drawable.pScreen;
    Bool	ret;
    damageScrPriv(pScreen);

    while ((pDamage = damageGetWinPriv(pWindow)))
    {
	DamageUnregister (&pWindow->drawable, pDamage);
	DamageDestroy (pDamage);
    }
    unwrap (pScrPriv, pScreen, DestroyWindow);
    ret = (*pScreen->DestroyWindow) (pWindow);
    wrap (pScrPriv, pScreen, DestroyWindow, damageDestroyWindow);
    return ret;
}

static Bool
damageCloseScreen (int i, ScreenPtr pScreen)
{
    damageScrPriv(pScreen);

    unwrap (pScrPriv, pScreen, DestroyPixmap);
    unwrap (pScrPriv, pScreen, CreateGC);
    unwrap (pScrPriv, pScreen, CopyWindow);
    unwrap (pScrPriv, pScreen, CloseScreen);
    free(pScrPriv);
    return (*pScreen->CloseScreen) (i, pScreen);
}

/**
 * Default implementations of the damage management functions.
 */
void miDamageCreate (DamagePtr pDamage)
{
}

void miDamageRegister (DrawablePtr pDrawable, DamagePtr pDamage)
{
}

void miDamageUnregister (DrawablePtr pDrawable, DamagePtr pDamage)
{
}

void miDamageDestroy (DamagePtr pDamage)
{
}

/**
 * Public functions for consumption outside this file.
 */

Bool
DamageSetup (ScreenPtr pScreen)
{
    DamageScrPrivPtr	pScrPriv;
    PictureScreenPtr	ps = GetPictureScreenIfSet(pScreen);
    const DamageScreenFuncsRec miFuncs = {
	miDamageCreate, miDamageRegister, miDamageUnregister, miDamageDestroy
    };

    if (!dixRegisterPrivateKey(&damageScrPrivateKeyRec, PRIVATE_SCREEN, 0))
	return FALSE;

    if (dixLookupPrivate(&pScreen->devPrivates, damageScrPrivateKey))
	return TRUE;

    if (!dixRegisterPrivateKey(&damageGCPrivateKeyRec, PRIVATE_GC, sizeof(DamageGCPrivRec)))
	return FALSE;

    if (!dixRegisterPrivateKey(&damagePixPrivateKeyRec, PRIVATE_PIXMAP, 0))
	return FALSE;

    if (!dixRegisterPrivateKey(&damageWinPrivateKeyRec, PRIVATE_WINDOW, 0))
	return FALSE;

    pScrPriv = malloc(sizeof (DamageScrPrivRec));
    if (!pScrPriv)
	return FALSE;

    pScrPriv->internalLevel = 0;
    pScrPriv->pScreenDamage = 0;

    wrap (pScrPriv, pScreen, DestroyPixmap, damageDestroyPixmap);
    wrap (pScrPriv, pScreen, CreateGC, damageCreateGC);
    wrap (pScrPriv, pScreen, DestroyWindow, damageDestroyWindow);
    wrap (pScrPriv, pScreen, SetWindowPixmap, damageSetWindowPixmap);
    wrap (pScrPriv, pScreen, CopyWindow, damageCopyWindow);
    wrap (pScrPriv, pScreen, CloseScreen, damageCloseScreen);
    if (ps) {
	wrap (pScrPriv, ps, Glyphs, damageGlyphs);
	wrap (pScrPriv, ps, Composite, damageComposite);
	wrap (pScrPriv, ps, AddTraps, damageAddTraps);
    }

    pScrPriv->funcs = miFuncs;

    dixSetPrivate(&pScreen->devPrivates, damageScrPrivateKey, pScrPriv);
    return TRUE;
}

DamagePtr
DamageCreate (DamageReportFunc  damageReport,
	      DamageDestroyFunc	damageDestroy,
	      DamageReportLevel	damageLevel,
	      Bool		isInternal,
	      ScreenPtr		pScreen,
	      void		*closure)
{
    damageScrPriv(pScreen);
    DamagePtr	pDamage;

    pDamage = dixAllocateObjectWithPrivates(DamageRec, PRIVATE_DAMAGE);
    if (!pDamage)
	return 0;
    pDamage->pNext = 0;
    pDamage->pNextWin = 0;
    RegionNull(&pDamage->damage);
    RegionNull(&pDamage->pendingDamage);
    
    pDamage->damageLevel = damageLevel;
    pDamage->isInternal = isInternal;
    pDamage->closure = closure;
    pDamage->isWindow = FALSE;
    pDamage->pDrawable = 0;
    pDamage->reportAfter = FALSE;

    pDamage->damageReport = damageReport;
    pDamage->damageReportPostRendering = NULL;
    pDamage->damageDestroy = damageDestroy;
    pDamage->damageMarker = NULL;
    pDamage->pScreen = pScreen;

    (*pScrPriv->funcs.Create) (pDamage);

    return pDamage;
}

void
DamageRegister (DrawablePtr pDrawable,
		DamagePtr   pDamage)
{
    ScreenPtr pScreen = pDrawable->pScreen;
    damageScrPriv(pScreen);

#if DAMAGE_VALIDATE_ENABLE
    if (pDrawable->pScreen != pDamage->pScreen)
    {
	ErrorF ("DamageRegister called with mismatched screens\n");
	OsAbort ();
    }
#endif

    if (pDrawable->type == DRAWABLE_WINDOW)
    {
	WindowPtr   pWindow = (WindowPtr) pDrawable;
	winDamageRef(pWindow);

#if DAMAGE_VALIDATE_ENABLE
	DamagePtr   pOld;
	
	for (pOld = *pPrev; pOld; pOld = pOld->pNextWin)
	    if (pOld == pDamage) {
		ErrorF ("Damage already on window list\n");
		OsAbort ();
	    }
#endif
	pDamage->pNextWin = *pPrev;
	*pPrev = pDamage;
	pDamage->isWindow = TRUE;
    }
    else
	pDamage->isWindow = FALSE;
    pDamage->pDrawable = pDrawable;
    damageInsertDamage (getDrawableDamageRef (pDrawable), pDamage);
    (*pScrPriv->funcs.Register) (pDrawable, pDamage);
}

void
DamageDrawInternal (ScreenPtr pScreen, Bool enable)
{
    damageScrPriv (pScreen);

    pScrPriv->internalLevel += enable ? 1 : -1;
}

void
DamageUnregister (DrawablePtr	    pDrawable,
		  DamagePtr	    pDamage)
{
    ScreenPtr pScreen = pDrawable->pScreen;
    damageScrPriv(pScreen);

    (*pScrPriv->funcs.Unregister) (pDrawable, pDamage);

    if (pDrawable->type == DRAWABLE_WINDOW)
    {
	WindowPtr   pWindow = (WindowPtr) pDrawable;
	winDamageRef (pWindow);
#if DAMAGE_VALIDATE_ENABLE
	int	found = 0;
#endif

	while (*pPrev)
	{
	    if (*pPrev == pDamage)
	    {
		*pPrev = pDamage->pNextWin;
#if DAMAGE_VALIDATE_ENABLE
		found = 1;
#endif
		break;
	    }
	    pPrev = &(*pPrev)->pNextWin;
	}
#if DAMAGE_VALIDATE_ENABLE
	if (!found) {
	    ErrorF ("Damage not on window list\n");
	    OsAbort ();
	}
#endif
    }
    pDamage->pDrawable = 0;
    damageRemoveDamage (getDrawableDamageRef (pDrawable), pDamage);
}

void
DamageDestroy (DamagePtr    pDamage)
{
    ScreenPtr pScreen = pDamage->pScreen;
    damageScrPriv(pScreen);

    if (pDamage->damageDestroy)
	(*pDamage->damageDestroy) (pDamage, pDamage->closure);
    (*pScrPriv->funcs.Destroy) (pDamage);
    RegionUninit(&pDamage->damage);
    RegionUninit(&pDamage->pendingDamage);
    dixFreeObjectWithPrivates(pDamage, PRIVATE_DAMAGE);
}

Bool
DamageSubtract (DamagePtr	    pDamage,
		const RegionPtr	    pRegion)
{
    RegionPtr	pClip;
    RegionRec	pixmapClip;
    DrawablePtr	pDrawable = pDamage->pDrawable;
    
    RegionSubtract(&pDamage->damage, &pDamage->damage, pRegion);
    if (pDrawable)
    {
	if (pDrawable->type == DRAWABLE_WINDOW)
	    pClip = &((WindowPtr) pDrawable)->borderClip;
	else
	{
	    BoxRec  box;

	    box.x1 = pDrawable->x;
	    box.y1 = pDrawable->y;
	    box.x2 = pDrawable->x + pDrawable->width;
	    box.y2 = pDrawable->y + pDrawable->height;
	    RegionInit(&pixmapClip, &box, 1);
	    pClip = &pixmapClip;
	}
	RegionTranslate(&pDamage->damage, pDrawable->x, pDrawable->y);
	RegionIntersect(&pDamage->damage, &pDamage->damage, pClip);
	RegionTranslate(&pDamage->damage, -pDrawable->x, -pDrawable->y);
	if (pDrawable->type != DRAWABLE_WINDOW)
	    RegionUninit(&pixmapClip);
    }
    return RegionNotEmpty(&pDamage->damage);
}

void
DamageEmpty (DamagePtr	    pDamage)
{
    RegionEmpty(&pDamage->damage);
}

RegionPtr
DamageRegion (DamagePtr		    pDamage)
{
    return &pDamage->damage;
}

RegionPtr
DamagePendingRegion (DamagePtr	    pDamage)
{
    return &pDamage->pendingDamage;
}

void
DamageRegionAppend (DrawablePtr pDrawable, RegionPtr pRegion)
{
    damageRegionAppend (pDrawable, pRegion, FALSE, -1);
}

void
DamageRegionProcessPending (DrawablePtr pDrawable)
{
    damageRegionProcessPending (pDrawable);
}

/* If a damage marker is provided, then this function must be called after rendering is done. */
/* Please do call back so any future enhancements can assume this function is called. */
/* There are no strict timing requirements for calling this function, just as soon as (is cheaply) possible. */
void
DamageRegionRendered (DrawablePtr pDrawable, DamagePtr pDamage, RegionPtr pOldDamage, RegionPtr pRegion)
{
    if (pDamage->damageReportPostRendering)
	damageReportDamagePostRendering (pDamage, pOldDamage, pRegion);
}

/* This call is very odd, i'm leaving it intact for API sake, but please don't use it. */
void
DamageDamageRegion (DrawablePtr	pDrawable,
		    const RegionPtr	pRegion)
{
    damageRegionAppend (pDrawable, pRegion, FALSE, -1);

    /* Go back and report this damage for DamagePtrs with reportAfter set, since
     * this call isn't part of an in-progress drawing op in the call chain and
     * the DDX probably just wants to know about it right away.
     */
    damageRegionProcessPending (pDrawable);
}

void
DamageSetReportAfterOp (DamagePtr pDamage, Bool reportAfter)
{
    pDamage->reportAfter = reportAfter;
}

void
DamageSetPostRenderingFunctions(DamagePtr pDamage, DamageReportFunc damageReportPostRendering,
				DamageMarkerFunc damageMarker)
{
    pDamage->damageReportPostRendering = damageReportPostRendering;
    pDamage->damageMarker = damageMarker;
}

DamageScreenFuncsPtr
DamageGetScreenFuncs (ScreenPtr pScreen)
{
    damageScrPriv(pScreen);
    return &pScrPriv->funcs;
}