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damage.c

/*
 * $Id: damage.c,v 1.17 2005/07/03 07:02:01 daniels Exp $
 *
 * 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    <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 *) &(pPixmap->devPrivates[damagePixPrivateIndex].ptr))

#define pixmapDamage(pPixmap)       damagePixPriv(pPixmap)

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

      pPixmap = 0;
      if (pScreen->GetWindowPixmap
#ifdef ROOTLESS_WORKAROUND
          && ((WindowPtr)pDrawable)->viewable
#endif
          )
          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 *) \
          &(pWindow->devPrivates[damageWinPrivateIndex].ptr)

#if DAMAGE_DEBUG_ENABLE
static void
_damageDamageRegion (DrawablePtr pDrawable, RegionPtr pRegion, Bool clip, int subWindowMode, const char *where)
#define damageDamageRegion(d,r,c,m) _damageDamageRegion(d,r,c,m,__FUNCTION__)
#else
static void
damageDamageRegion (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;
    Bool        was_empty;
    RegionRec         tmpRegion;
    BoxRec      tmpBox;
    int               draw_x, draw_y;
#ifdef COMPOSITE
    int               screen_x = 0, screen_y = 0;
#endif

    /* short circuit for empty regions */
    if (!REGION_NOTEMPTY(pScreen, 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)
        REGION_TRANSLATE (pScreen, pRegion, screen_x, screen_y);
#endif
      
    if (pDrawable->type == DRAWABLE_WINDOW &&
      ((WindowPtr)(pDrawable))->backingStore == NotUseful)
    {
      if (subWindowMode == ClipByChildren)
      {
          REGION_INTERSECT(pScreen, pRegion, pRegion,
                       &((WindowPtr)(pDrawable))->clipList);
      }
      else if (subWindowMode == IncludeInferiors)
      {
          RegionPtr pTempRegion =
            NotClippedByChildren((WindowPtr)(pDrawable));
          REGION_INTERSECT(pScreen, pRegion, pRegion, pTempRegion);
          REGION_DESTROY(pScreen, pTempRegion);
      }
      /* If subWindowMode is set to an invalid value, don't perform
       * any drawable-based clipping. */
    }
        

    REGION_NULL (pScreen, &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)
      {
#if 0
          DAMAGE_DEBUG (("damage while window unrealized\n"));
#endif
          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 (pDamage->pDrawable->type != DRAWABLE_WINDOW)
      {
          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) {
            REGION_INTERSECT (pScreen, 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;
            REGION_INIT(pScreen, &pixClip, &box, 1);
            REGION_INTERSECT (pScreen, pDamageRegion, pRegion, &pixClip);
            REGION_UNINIT(pScreen, &pixClip);
          }
          /*
           * Short circuit empty results
           */
          if (!REGION_NOTEMPTY(pScreen, 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)
          REGION_TRANSLATE (pScreen, pDamageRegion, -draw_x, -draw_y);
      
      switch (pDamage->damageLevel) {
      case DamageReportRawRegion:
          (*pDamage->damageReport) (pDamage, pDamageRegion, pDamage->closure);
          break;
      case DamageReportDeltaRegion:
          REGION_NULL (pScreen, &tmpRegion);
          REGION_SUBTRACT (pScreen, &tmpRegion, pDamageRegion, &pDamage->damage);
          if (REGION_NOTEMPTY (pScreen, &tmpRegion))
          {
            REGION_UNION(pScreen, &pDamage->damage,
                       &pDamage->damage, pDamageRegion);
            (*pDamage->damageReport) (pDamage, &tmpRegion, pDamage->closure);
          }
          REGION_UNINIT(pScreen, &tmpRegion);
          break;
      case DamageReportBoundingBox:
          tmpBox = *REGION_EXTENTS (pScreen, &pDamage->damage);
          REGION_UNION(pScreen, &pDamage->damage,
                   &pDamage->damage, pDamageRegion);
          if (!BOX_SAME (&tmpBox, REGION_EXTENTS (pScreen, &pDamage->damage)))
            (*pDamage->damageReport) (pDamage, &pDamage->damage, pDamage->closure);
          break;
      case DamageReportNonEmpty:
          was_empty = !REGION_NOTEMPTY(pScreen, &pDamage->damage);
          REGION_UNION(pScreen, &pDamage->damage, &pDamage->damage,
                   pDamageRegion);
          if (was_empty && REGION_NOTEMPTY(pScreen, &pDamage->damage))
            (*pDamage->damageReport) (pDamage, &pDamage->damage, pDamage->closure);
          break;
      case DamageReportNone:
          REGION_UNION(pScreen, &pDamage->damage, &pDamage->damage,
                   pDamageRegion);
          break;
      }
      /*
       * translate original region back
       */
      if (pDamageRegion == pRegion && (draw_x || draw_y))
          REGION_TRANSLATE (pScreen, pDamageRegion, draw_x, draw_y);
    }
#ifdef COMPOSITE
    if (screen_x || screen_y)
      REGION_TRANSLATE (pScreen, pRegion, -screen_x, -screen_y);
#endif
    
    REGION_UNINIT (pScreen, &clippedRec);
}

#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;

    REGION_INIT (pDrawable->pScreen, &region, pBox, 1);
#if DAMAGE_DEBUG_ENABLE
    _damageDamageRegion (pDrawable, &region, TRUE, subWindowMode, where);
#else
    damageDamageRegion (pDrawable, &region, TRUE, subWindowMode);
#endif
    REGION_UNINIT (pDrawable->pScreen, &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);

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

extern GCOps damageGCOps;

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

    pGC->pCompositeClip = 0;
    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;
}

#ifdef NOTUSED
static void
damageWrapGC (GCPtr pGC)
{
    damageGCPriv(pGC);

    pGCPriv->ops = NULL;
    pGCPriv->funcs = pGC->funcs;
    pGC->funcs = &damageGCFuncs;
}

static void
damageUnwrapGC (GCPtr pGC)
{
    damageGCPriv(pGC);

    pGC->funcs = pGCPriv->funcs;
    if (pGCPriv->ops)
      pGC->ops = pGCPriv->ops;
}
#endif

#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 ||\
                          REGION_NOTEMPTY(d->pScreen, \
                                      g->pCompositeClip)))

#ifdef RENDER

#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) && \
                         REGION_NOTEMPTY(pScreen, 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);
    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);
    wrap (pScrPriv, ps, Glyphs, damageGlyphs);
}
#endif

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


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);

    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);
    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);
    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);
    
    /* The driver will only call SourceValidate() when pSrc != pDst,
     * but the software sprite (misprite.c) always need to know when a
     * drawable is copied so it can remove the sprite. See #1030. */
    if ((pSrc == pDst) && pSrc->pScreen->SourceValidate &&
      pSrc->type == DRAWABLE_WINDOW &&
      ((WindowPtr)pSrc)->viewable)
    {
      (*pSrc->pScreen->SourceValidate) (pSrc, srcx, srcy, width, height);
    }
    
    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);
    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);

    /* The driver will only call SourceValidate() when pSrc != pDst,
     * but the software sprite (misprite.c) always need to know when a
     * drawable is copied so it can remove the sprite. See #1030. */
    if ((pSrc == pDst) && pSrc->pScreen->SourceValidate &&
      pSrc->type == DRAWABLE_WINDOW &&
      ((WindowPtr)pSrc)->viewable)
    {
        (*pSrc->pScreen->SourceValidate) (pSrc, srcx, srcy, width, height);
    }

    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);
    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);
    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);
    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);
    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);
    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);
    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);
    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 + pRectsTmp->width;
      box.y1 = pRectsTmp->y;
      box.y2 = box.y1 + 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);
    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);
    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 = (CharInfoPtr *) ALLOCATE_LOCAL(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));
    }
    DEALLOCATE_LOCAL(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);
    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);
    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);
    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);
    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);
    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);
    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);
    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");
    abort ();
#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");
          abort ();
      }
#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
damagePaintWindow(WindowPtr pWindow,
              RegionPtr prgn,
              int     what)
{
    ScreenPtr pScreen = pWindow->drawable.pScreen;
    damageScrPriv(pScreen);

    /*
     * Painting background none doesn't actually *do* anything, so
     * no damage is recorded
     */
    if ((what != PW_BACKGROUND || pWindow->backgroundState != None) &&
      getWindowDamage (pWindow))
      damageDamageRegion (&pWindow->drawable, prgn, FALSE, -1);
    if(what == PW_BACKGROUND) {
      unwrap (pScrPriv, pScreen, PaintWindowBackground);
      (*pScreen->PaintWindowBackground) (pWindow, prgn, what);
      wrap (pScrPriv, pScreen, PaintWindowBackground, damagePaintWindow);
    } else {
      unwrap (pScrPriv, pScreen, PaintWindowBorder);
      (*pScreen->PaintWindowBorder) (pWindow, prgn, what);
      wrap (pScrPriv, pScreen, PaintWindowBorder, damagePaintWindow);
    }
}


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.
       */
      REGION_TRANSLATE (pScreen, prgnSrc, dx, dy);
      damageDamageRegion (&pWindow->drawable, prgnSrc, FALSE, -1);
      REGION_TRANSLATE (pScreen, prgnSrc, -dx, -dy);
    }
    unwrap (pScrPriv, pScreen, CopyWindow);
    (*pScreen->CopyWindow) (pWindow, ptOldOrg, prgnSrc);
    wrap (pScrPriv, pScreen, CopyWindow, damageCopyWindow);
}

GCOps damageGCOps = {
    damageFillSpans, damageSetSpans,
    damagePutImage, damageCopyArea,
    damageCopyPlane, damagePolyPoint,
    damagePolylines, damagePolySegment,
    damagePolyRectangle, damagePolyArc,
    damageFillPolygon, damagePolyFillRect,
    damagePolyFillArc, damagePolyText8,
    damagePolyText16, damageImageText8,
    damageImageText16, damageImageGlyphBlt,
    damagePolyGlyphBlt, damagePushPixels,
#ifdef NEED_LINEHELPER
    NULL,
#endif
    {NULL}        /* devPrivate */
};

static void
damageRestoreAreas (PixmapPtr pPixmap,
                RegionPtr     prgn,
                int           xorg,
                int           yorg,
                WindowPtr     pWindow)
{
    ScreenPtr pScreen = pWindow->drawable.pScreen;
    damageScrPriv(pScreen);

    damageDamageRegion (&pWindow->drawable, prgn, FALSE, -1);
    unwrap (pScrPriv, pScreen, BackingStoreFuncs.RestoreAreas);
    (*pScreen->BackingStoreFuncs.RestoreAreas) (pPixmap, prgn,
                                    xorg, yorg, pWindow);
    wrap (pScrPriv, pScreen, BackingStoreFuncs.RestoreAreas,
                       damageRestoreAreas);
}

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, PaintWindowBackground);
    unwrap (pScrPriv, pScreen, PaintWindowBorder);
    unwrap (pScrPriv, pScreen, CopyWindow);
    unwrap (pScrPriv, pScreen, CloseScreen);
    unwrap (pScrPriv, pScreen, BackingStoreFuncs.RestoreAreas);
    xfree (pScrPriv);
    return (*pScreen->CloseScreen) (i, pScreen);
}

int damageScrPrivateIndex;
int damagePixPrivateIndex;
int damageGCPrivateIndex;
int damageWinPrivateIndex;
int damageGeneration;

Bool
DamageSetup (ScreenPtr pScreen)
{
    DamageScrPrivPtr    pScrPriv;
#ifdef RENDER
    PictureScreenPtr    ps = GetPictureScreenIfSet(pScreen);
#endif

    if (damageGeneration != serverGeneration)
    {
      damageScrPrivateIndex = AllocateScreenPrivateIndex ();
      if (damageScrPrivateIndex == -1)
          return FALSE;
      damageGCPrivateIndex = AllocateGCPrivateIndex ();
      if (damageGCPrivateIndex == -1)
          return FALSE;
      damagePixPrivateIndex = AllocatePixmapPrivateIndex ();
      if (damagePixPrivateIndex == -1)
          return FALSE;
      damageWinPrivateIndex = AllocateWindowPrivateIndex ();
      if (damageWinPrivateIndex == -1)
          return FALSE;
      damageGeneration = serverGeneration;
    }
    if (pScreen->devPrivates[damageScrPrivateIndex].ptr)
      return TRUE;

    if (!AllocateGCPrivate (pScreen, damageGCPrivateIndex, sizeof (DamageGCPrivRec)))
      return FALSE;
    if (!AllocatePixmapPrivate (pScreen, damagePixPrivateIndex, 0))
      return FALSE;
    if (!AllocateWindowPrivate (pScreen, damageWinPrivateIndex, 0))
      return FALSE;

    pScrPriv = (DamageScrPrivPtr) xalloc (sizeof (DamageScrPrivRec));
    if (!pScrPriv)
      return FALSE;

#ifdef COMPOSITE
    /* This is a kludge to ensure wrapping order with the composite wrapper.
     * If it's done from compinit.c, then DamageSetup may be called before the
     * extension init phase, so that cw will be higher in the wrapping chain and
     * rewrite drawables before damage gets to it, causing confusion.
     */
    if (!noCompositeExtension)
      miInitializeCompositeWrapper (pScreen);
#endif
      
    pScrPriv->internalLevel = 0;
    pScrPriv->pScreenDamage = 0;

    wrap (pScrPriv, pScreen, DestroyPixmap, damageDestroyPixmap);
    wrap (pScrPriv, pScreen, CreateGC, damageCreateGC);
    wrap (pScrPriv, pScreen, PaintWindowBackground, damagePaintWindow);
    wrap (pScrPriv, pScreen, PaintWindowBorder, damagePaintWindow);
    wrap (pScrPriv, pScreen, DestroyWindow, damageDestroyWindow);
    wrap (pScrPriv, pScreen, SetWindowPixmap, damageSetWindowPixmap);
    wrap (pScrPriv, pScreen, CopyWindow, damageCopyWindow);
    wrap (pScrPriv, pScreen, CloseScreen, damageCloseScreen);
    wrap (pScrPriv, pScreen, BackingStoreFuncs.RestoreAreas,
                       damageRestoreAreas);
#ifdef RENDER
    if (ps) {
      wrap (pScrPriv, ps, Glyphs, damageGlyphs);
      wrap (pScrPriv, ps, Composite, damageComposite);
    }
#endif

    pScreen->devPrivates[damageScrPrivateIndex].ptr = (pointer) pScrPriv;
    return TRUE;
}

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

    pDamage = xalloc (sizeof (DamageRec));
    if (!pDamage)
      return 0;
    pDamage->pNext = 0;
    pDamage->pNextWin = 0;
    REGION_NULL(pScreen, &pDamage->damage);
    
    pDamage->damageLevel = damageLevel;
    pDamage->isInternal = isInternal;
    pDamage->closure = closure;
    pDamage->isWindow = FALSE;
    pDamage->pDrawable = 0;

    pDamage->damageReport = damageReport;
    pDamage->damageDestroy = damageDestroy;
    return pDamage;
}

void
DamageRegister (DrawablePtr pDrawable,
            DamagePtr   pDamage)
{
    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");
            abort ();
          }
#endif
      pDamage->pNextWin = *pPrev;
      *pPrev = pDamage;
      pDamage->isWindow = TRUE;
    }
    else
      pDamage->isWindow = FALSE;
    pDamage->pDrawable = pDrawable;
    damageInsertDamage (getDrawableDamageRef (pDrawable), pDamage);
}

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

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

void
DamageUnregister (DrawablePtr     pDrawable,
              DamagePtr     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");
          abort ();
      }
#endif
    }
    pDamage->pDrawable = 0;
    damageRemoveDamage (getDrawableDamageRef (pDrawable), pDamage);
}

void
DamageDestroy (DamagePtr    pDamage)
{
    if (pDamage->damageDestroy)
      (*pDamage->damageDestroy) (pDamage, pDamage->closure);
    REGION_UNINIT (pDamage->pDrawable->pScreen, &pDamage->damage);
    xfree (pDamage);
}

Bool
DamageSubtract (DamagePtr         pDamage,
            const RegionPtr       pRegion)
{
    RegionPtr     pClip;
    RegionRec     pixmapClip;
    DrawablePtr   pDrawable = pDamage->pDrawable;
    
    REGION_SUBTRACT (pDrawable->pScreen, &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;
          REGION_INIT (pDrawable->pScreen, &pixmapClip, &box, 1);
          pClip = &pixmapClip;
      }
      REGION_TRANSLATE (pDrawable->pScreen, &pDamage->damage, pDrawable->x, pDrawable->y);
      REGION_INTERSECT (pDrawable->pScreen, &pDamage->damage, &pDamage->damage, pClip);
      REGION_TRANSLATE (pDrawable->pScreen, &pDamage->damage, -pDrawable->x, -pDrawable->y);
      if (pDrawable->type != DRAWABLE_WINDOW)
          REGION_UNINIT(pDrawable->pScreen, &pixmapClip);
    }
    return REGION_NOTEMPTY (pDrawable->pScreen, &pDamage->damage);
}

void
DamageEmpty (DamagePtr      pDamage)
{
    REGION_EMPTY (pDamage->pDrawable->pScreen, &pDamage->damage);
}

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

void
DamageDamageRegion (DrawablePtr     pDrawable,
                RegionPtr     pRegion)
{
    damageDamageRegion (pDrawable, pRegion, FALSE, -1);
}

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