mi/miexpose.c

   1 /***********************************************************
   2
   3 Copyright 1987, 1998  The Open Group
   4
   5 Permission to use, copy, modify, distribute, and sell this software and its
   6 documentation for any purpose is hereby granted without fee, provided that
   7 the above copyright notice appear in all copies and that both that
   8 copyright notice and this permission notice appear in supporting
   9 documentation.
  10
  11 The above copyright notice and this permission notice shall be included in
  12 all copies or substantial portions of the Software.
  13
  14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  17 OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  18 AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  19 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  20
  21 Except as contained in this notice, the name of The Open Group shall not be
  22 used in advertising or otherwise to promote the sale, use or other dealings
  23 in this Software without prior written authorization from The Open Group.
  24
  25 Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
  26
  27                         All Rights Reserved
  28
  29 Permission to use, copy, modify, and distribute this software and its
  30 documentation for any purpose and without fee is hereby granted,
  31 provided that the above copyright notice appear in all copies and that
  32 both that copyright notice and this permission notice appear in
  33 supporting documentation, and that the name of Digital not be
  34 used in advertising or publicity pertaining to distribution of the
  35 software without specific, written prior permission.
  36
  37 DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
  38 ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
  39 DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
  40 ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  41 WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
  42 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  43 SOFTWARE.
  44
  45 ******************************************************************/
  46 /*****************************************************************
  47
  48 Copyright (c) 1991, 1997 Digital Equipment Corporation, Maynard, Massachusetts.
  49
  50 Permission is hereby granted, free of charge, to any person obtaining a copy
  51 of this software and associated documentation files (the "Software"), to deal
  52 in the Software without restriction, including without limitation the rights
  53 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  54 copies of the Software.
  55
  56 The above copyright notice and this permission notice shall be included in
  57 all copies or substantial portions of the Software.
  58
  59 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  60 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  61 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  62 DIGITAL EQUIPMENT CORPORATION BE LIABLE FOR ANY CLAIM, DAMAGES, INCLUDING,
  63 BUT NOT LIMITED TO CONSEQUENTIAL OR INCIDENTAL DAMAGES, OR OTHER LIABILITY,
  64 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
  65 IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  66
  67 Except as contained in this notice, the name of Digital Equipment Corporation
  68 shall not be used in advertising or otherwise to promote the sale, use or other
  69 dealings in this Software without prior written authorization from Digital
  70 Equipment Corporation.
  71
  72 ******************************************************************/
  73
  74 #ifdef HAVE_DIX_CONFIG_H
  75 #include <dix-config.h>
  76 #endif
  77
  78 #include <X11/X.h>
  79 #include <X11/Xproto.h>
  80 #include <X11/Xprotostr.h>
  81
  82 #include "misc.h"
  83 #include "regionstr.h"
  84 #include "scrnintstr.h"
  85 #include "gcstruct.h"
  86 #include "windowstr.h"
  87 #include "pixmap.h"
  88 #include "input.h"
  89
  90 #include "dixstruct.h"
  91 #include "mi.h"
  92 #include <X11/Xmd.h>
  93
  94 #include "globals.h"
  95
  96 #ifdef PANORAMIX
  97 #include "panoramiX.h"
  98 #include "panoramiXsrv.h"
  99 #endif
 100
 101 /*
 102     machine-independent graphics exposure code.  any device that uses
 103 the region package can call this.
 104 */
 105
 106 #ifndef RECTLIMIT
 107 #define RECTLIMIT 25            /* pick a number, any number > 8 */
 108 #endif
 109
 110 /* miHandleExposures
 111     generate a region for exposures for areas that were copied from obscured or
 112 non-existent areas to non-obscured areas of the destination.  Paint the
 113 background for the region, if the destination is a window.
 114
 115 NOTE:
 116      this should generally be called, even if graphicsExposures is false,
 117 because this is where bits get recovered from backing store.
 118
 119 NOTE:
 120      added argument 'plane' is used to indicate how exposures from backing
 121 store should be accomplished. If plane is 0 (i.e. no bit plane), CopyArea
 122 should be used, else a CopyPlane of the indicated plane will be used. The
 123 exposing is done by the backing store's GraphicsExpose function, of course.
 124
 125 */
 126
 127 RegionPtr
 128 miHandleExposures(DrawablePtr pSrcDrawable, DrawablePtr pDstDrawable,
 129                   GCPtr pGC, int srcx, int srcy, int width, int height,
 130                   int dstx, int dsty, unsigned long plane)
 131 {
 132     RegionPtr prgnSrcClip;      /* drawable-relative source clip */
 133     RegionRec rgnSrcRec;
 134     RegionPtr prgnDstClip;      /* drawable-relative dest clip */
 135     RegionRec rgnDstRec;
 136     BoxRec srcBox;              /* unclipped source */
 137     RegionRec rgnExposed;       /* exposed region, calculated source-
 138                                    relative, made dst relative to
 139                                    intersect with visible parts of
 140                                    dest and send events to client,
 141                                    and then screen relative to paint
 142                                    the window background
 143                                  */
 144     WindowPtr pSrcWin;
 145     BoxRec expBox;
 146     Bool extents;
 147
 148     /* avoid work if we can */
 149     if (!pGC->graphicsExposures &&
 150         (pDstDrawable->type == DRAWABLE_PIXMAP) &&
 151         ((pSrcDrawable->type == DRAWABLE_PIXMAP) ||
 152          (((WindowPtr) pSrcDrawable)->backStorage == NULL)))
 153         return NULL;
 154
 155     srcBox.x1 = srcx;
 156     srcBox.y1 = srcy;
 157     srcBox.x2 = srcx + width;
 158     srcBox.y2 = srcy + height;
 159
 160     if (pSrcDrawable->type != DRAWABLE_PIXMAP) {
 161         BoxRec TsrcBox;
 162
 163         TsrcBox.x1 = srcx + pSrcDrawable->x;
 164         TsrcBox.y1 = srcy + pSrcDrawable->y;
 165         TsrcBox.x2 = TsrcBox.x1 + width;
 166         TsrcBox.y2 = TsrcBox.y1 + height;
 167         pSrcWin = (WindowPtr) pSrcDrawable;
 168         if (pGC->subWindowMode == IncludeInferiors) {
 169             prgnSrcClip = NotClippedByChildren(pSrcWin);
 170             if ((RegionContainsRect(prgnSrcClip, &TsrcBox)) == rgnIN) {
 171                 RegionDestroy(prgnSrcClip);
 172                 return NULL;
 173             }
 174         }
 175         else {
 176             if ((RegionContainsRect(&pSrcWin->clipList, &TsrcBox)) == rgnIN)
 177                 return NULL;
 178             prgnSrcClip = &rgnSrcRec;
 179             RegionNull(prgnSrcClip);
 180             RegionCopy(prgnSrcClip, &pSrcWin->clipList);
 181         }
 182         RegionTranslate(prgnSrcClip, -pSrcDrawable->x, -pSrcDrawable->y);
 183     }
 184     else {
 185         BoxRec box;
 186
 187         if ((srcBox.x1 >= 0) && (srcBox.y1 >= 0) &&
 188             (srcBox.x2 <= pSrcDrawable->width) &&
 189             (srcBox.y2 <= pSrcDrawable->height))
 190             return NULL;
 191
 192         box.x1 = 0;
 193         box.y1 = 0;
 194         box.x2 = pSrcDrawable->width;
 195         box.y2 = pSrcDrawable->height;
 196         prgnSrcClip = &rgnSrcRec;
 197         RegionInit(prgnSrcClip, &box, 1);
 198         pSrcWin = NULL;
 199     }
 200
 201     if (pDstDrawable == pSrcDrawable) {
 202         prgnDstClip = prgnSrcClip;
 203     }
 204     else if (pDstDrawable->type != DRAWABLE_PIXMAP) {
 205         if (pGC->subWindowMode == IncludeInferiors) {
 206             prgnDstClip = NotClippedByChildren((WindowPtr) pDstDrawable);
 207         }
 208         else {
 209             prgnDstClip = &rgnDstRec;
 210             RegionNull(prgnDstClip);
 211             RegionCopy(prgnDstClip, &((WindowPtr) pDstDrawable)->clipList);
 212         }
 213         RegionTranslate(prgnDstClip, -pDstDrawable->x, -pDstDrawable->y);
 214     }
 215     else {
 216         BoxRec box;
 217
 218         box.x1 = 0;
 219         box.y1 = 0;
 220         box.x2 = pDstDrawable->width;
 221         box.y2 = pDstDrawable->height;
 222         prgnDstClip = &rgnDstRec;
 223         RegionInit(prgnDstClip, &box, 1);
 224     }
 225
 226     /* drawable-relative source region */
 227     RegionInit(&rgnExposed, &srcBox, 1);
 228
 229     /* now get the hidden parts of the source box */
 230     RegionSubtract(&rgnExposed, &rgnExposed, prgnSrcClip);
 231
 232     /* move them over the destination */
 233     RegionTranslate(&rgnExposed, dstx - srcx, dsty - srcy);
 234
 235     /* intersect with visible areas of dest */
 236     RegionIntersect(&rgnExposed, &rgnExposed, prgnDstClip);
 237
 238     /* intersect with client clip region. */
 239     if (pGC->clientClipType == CT_REGION)
 240         RegionIntersect(&rgnExposed, &rgnExposed, pGC->clientClip);
 241
 242     /*
 243      * If we have LOTS of rectangles, we decide to take the extents
 244      * and force an exposure on that.  This should require much less
 245      * work overall, on both client and server.  This is cheating, but
 246      * isn't prohibited by the protocol ("spontaneous combustion" :-)
 247      * for windows.
 248      */
 249     extents = pGC->graphicsExposures &&
 250         (RegionNumRects(&rgnExposed) > RECTLIMIT) &&
 251         (pDstDrawable->type != DRAWABLE_PIXMAP);
 252     if (pSrcWin) {
 253         RegionPtr region;
 254
 255         if (!(region = wClipShape(pSrcWin)))
 256             region = wBoundingShape(pSrcWin);
 257         /*
 258          * If you try to CopyArea the extents of a shaped window, compacting the
 259          * exposed region will undo all our work!
 260          */
 261         if (extents && pSrcWin && region &&
 262             (RegionContainsRect(region, &srcBox) != rgnIN))
 263             extents = FALSE;
 264     }
 265     if (extents) {
 266         expBox = *RegionExtents(&rgnExposed);
 267         RegionReset(&rgnExposed, &expBox);
 268     }
 269     if ((pDstDrawable->type != DRAWABLE_PIXMAP) &&
 270         (((WindowPtr) pDstDrawable)->backgroundState != None)) {
 271         WindowPtr pWin = (WindowPtr) pDstDrawable;
 272
 273         /* make the exposed area screen-relative */
 274         RegionTranslate(&rgnExposed, pDstDrawable->x, pDstDrawable->y);
 275
 276         if (extents) {
 277             /* miPaintWindow doesn't clip, so we have to */
 278             RegionIntersect(&rgnExposed, &rgnExposed, &pWin->clipList);
 279         }
 280         miPaintWindow((WindowPtr) pDstDrawable, &rgnExposed, PW_BACKGROUND);
 281
 282         if (extents) {
 283             RegionReset(&rgnExposed, &expBox);
 284         }
 285         else
 286             RegionTranslate(&rgnExposed, -pDstDrawable->x, -pDstDrawable->y);
 287     }
 288     if (prgnDstClip == &rgnDstRec) {
 289         RegionUninit(prgnDstClip);
 290     }
 291     else if (prgnDstClip != prgnSrcClip) {
 292         RegionDestroy(prgnDstClip);
 293     }
 294
 295     if (prgnSrcClip == &rgnSrcRec) {
 296         RegionUninit(prgnSrcClip);
 297     }
 298     else {
 299         RegionDestroy(prgnSrcClip);
 300     }
 301
 302     if (pGC->graphicsExposures) {
 303         /* don't look */
 304         RegionPtr exposed = RegionCreate(NullBox, 0);
 305
 306         *exposed = rgnExposed;
 307         return exposed;
 308     }
 309     else {
 310         RegionUninit(&rgnExposed);
 311         return NULL;
 312     }
 313 }
 314
 315 /* send GraphicsExpose events, or a NoExpose event, based on the region */
 316
 317 void
 318 miSendGraphicsExpose(ClientPtr client, RegionPtr pRgn, XID drawable,
 319                      int major, int minor)
 320 {
 321     if (pRgn && !RegionNil(pRgn)) {
 322         xEvent *pEvent;
 323         xEvent *pe;
 324         BoxPtr pBox;
 325         int i;
 326         int numRects;
 327
 328         numRects = RegionNumRects(pRgn);
 329         pBox = RegionRects(pRgn);
 330         if (!(pEvent = malloc(numRects * sizeof(xEvent))))
 331             return;
 332         pe = pEvent;
 333
 334         for (i = 1; i <= numRects; i++, pe++, pBox++) {
 335             pe->u.u.type = GraphicsExpose;
 336             pe->u.graphicsExposure.drawable = drawable;
 337             pe->u.graphicsExposure.x = pBox->x1;
 338             pe->u.graphicsExposure.y = pBox->y1;
 339             pe->u.graphicsExposure.width = pBox->x2 - pBox->x1;
 340             pe->u.graphicsExposure.height = pBox->y2 - pBox->y1;
 341             pe->u.graphicsExposure.count = numRects - i;
 342             pe->u.graphicsExposure.majorEvent = major;
 343             pe->u.graphicsExposure.minorEvent = minor;
 344         }
 345         /* GraphicsExpose is a "critical event", which TryClientEvents
 346          * handles specially. */
 347         TryClientEvents(client, NULL, pEvent, numRects,
 348                         (Mask) 0, NoEventMask, NullGrab);
 349         free(pEvent);
 350     }
 351     else {
 352         xEvent event;
 353
 354         memset(&event, 0, sizeof(xEvent));
 355         event.u.u.type = NoExpose;
 356         event.u.noExposure.drawable = drawable;
 357         event.u.noExposure.majorEvent = major;
 358         event.u.noExposure.minorEvent = minor;
 359         WriteEventsToClient(client, 1, &event);
 360     }
 361 }
 362
 363 void
 364 miSendExposures(WindowPtr pWin, RegionPtr pRgn, int dx, int dy)
 365 {
 366     BoxPtr pBox;
 367     int numRects;
 368     xEvent *pEvent, *pe;
 369     int i;
 370
 371     pBox = RegionRects(pRgn);
 372     numRects = RegionNumRects(pRgn);
 373     if (!(pEvent = calloc(1, numRects * sizeof(xEvent))))
 374         return;
 375
 376     for (i = numRects, pe = pEvent; --i >= 0; pe++, pBox++) {
 377         pe->u.u.type = Expose;
 378         pe->u.expose.window = pWin->drawable.id;
 379         pe->u.expose.x = pBox->x1 - dx;
 380         pe->u.expose.y = pBox->y1 - dy;
 381         pe->u.expose.width = pBox->x2 - pBox->x1;
 382         pe->u.expose.height = pBox->y2 - pBox->y1;
 383         pe->u.expose.count = i;
 384     }
 385
 386 #ifdef PANORAMIX
 387     if (!noPanoramiXExtension) {
 388         int scrnum = pWin->drawable.pScreen->myNum;
 389         int x = 0, y = 0;
 390         XID realWin = 0;
 391
 392         if (!pWin->parent) {
 393             x = screenInfo.screens[scrnum]->x;
 394             y = screenInfo.screens[scrnum]->y;
 395             pWin = screenInfo.screens[0]->root;
 396             realWin = pWin->drawable.id;
 397         }
 398         else if (scrnum) {
 399             PanoramiXRes *win;
 400
 401             win = PanoramiXFindIDByScrnum(XRT_WINDOW,
 402                                           pWin->drawable.id, scrnum);
 403             if (!win) {
 404                 free(pEvent);
 405                 return;
 406             }
 407             realWin = win->info[0].id;
 408             dixLookupWindow(&pWin, realWin, serverClient, DixSendAccess);
 409         }
 410         if (x || y || scrnum)
 411             for (i = 0; i < numRects; i++) {
 412                 pEvent[i].u.expose.window = realWin;
 413                 pEvent[i].u.expose.x += x;
 414                 pEvent[i].u.expose.y += y;
 415             }
 416     }
 417 #endif
 418
 419     DeliverEvents(pWin, pEvent, numRects, NullWindow);
 420
 421     free(pEvent);
 422 }
 423
 424 void
 425 miWindowExposures(WindowPtr pWin, RegionPtr prgn, RegionPtr other_exposed)
 426 {
 427     RegionPtr exposures = prgn;
 428
 429     if ((prgn && !RegionNil(prgn)) ||
 430         (exposures && !RegionNil(exposures)) || other_exposed) {
 431         RegionRec expRec;
 432         int clientInterested;
 433
 434         /*
 435          * Restore from backing-store FIRST.
 436          */
 437         clientInterested =
 438             (pWin->eventMask | wOtherEventMasks(pWin)) & ExposureMask;
 439         if (other_exposed) {
 440             if (exposures) {
 441                 RegionUnion(other_exposed, exposures, other_exposed);
 442                 if (exposures != prgn)
 443                     RegionDestroy(exposures);
 444             }
 445             exposures = other_exposed;
 446         }
 447         if (clientInterested && exposures &&
 448             (RegionNumRects(exposures) > RECTLIMIT)) {
 449             /*
 450              * If we have LOTS of rectangles, we decide to take the extents
 451              * and force an exposure on that.  This should require much less
 452              * work overall, on both client and server.  This is cheating, but
 453              * isn't prohibited by the protocol ("spontaneous combustion" :-).
 454              */
 455             BoxRec box;
 456
 457             box = *RegionExtents(exposures);
 458             if (exposures == prgn) {
 459                 exposures = &expRec;
 460                 RegionInit(exposures, &box, 1);
 461                 RegionReset(prgn, &box);
 462             }
 463             else {
 464                 RegionReset(exposures, &box);
 465                 RegionUnion(prgn, prgn, exposures);
 466             }
 467             /* miPaintWindow doesn't clip, so we have to */
 468             RegionIntersect(prgn, prgn, &pWin->clipList);
 469         }
 470         if (prgn && !RegionNil(prgn))
 471             miPaintWindow(pWin, prgn, PW_BACKGROUND);
 472         if (clientInterested && exposures && !RegionNil(exposures))
 473             miSendExposures(pWin, exposures,
 474                             pWin->drawable.x, pWin->drawable.y);
 475         if (exposures == &expRec) {
 476             RegionUninit(exposures);
 477         }
 478         else if (exposures && exposures != prgn && exposures != other_exposed)
 479             RegionDestroy(exposures);
 480         if (prgn)
 481             RegionEmpty(prgn);
 482     }
 483     else if (exposures && exposures != prgn)
 484         RegionDestroy(exposures);
 485 }
 486
 487 #ifdef ROOTLESS
 488 /* Ugly, ugly, but we lost our hooks into miPaintWindow... =/ */
 489 void RootlessSetPixmapOfAncestors(WindowPtr pWin);
 490 void RootlessStartDrawing(WindowPtr pWin);
 491 void RootlessDamageRegion(WindowPtr pWin, RegionPtr prgn);
 492 Bool IsFramedWindow(WindowPtr pWin);
 493 #endif
 494
 495 void
 496 miPaintWindow(WindowPtr pWin, RegionPtr prgn, int what)
 497 {
 498     ScreenPtr pScreen = pWin->drawable.pScreen;
 499     ChangeGCVal gcval[6];
 500     BITS32 gcmask;
 501     GCPtr pGC;
 502     int i;
 503     BoxPtr pbox;
 504     xRectangle *prect;
 505     int numRects;
 506
 507     /*
 508      * Distance from screen to destination drawable, use this
 509      * to adjust rendering coordinates which come in in screen space
 510      */
 511     int draw_x_off, draw_y_off;
 512
 513     /*
 514      * Tile offset for drawing; these need to align the tile
 515      * to the appropriate window origin
 516      */
 517     int tile_x_off, tile_y_off;
 518     PixUnion fill;
 519     Bool solid = TRUE;
 520     DrawablePtr drawable = &pWin->drawable;
 521
 522 #ifdef ROOTLESS
 523     if (!drawable || drawable->type == UNDRAWABLE_WINDOW)
 524         return;
 525
 526     if (IsFramedWindow(pWin)) {
 527         RootlessStartDrawing(pWin);
 528         RootlessDamageRegion(pWin, prgn);
 529
 530         if (pWin->backgroundState == ParentRelative) {
 531             if ((what == PW_BACKGROUND) ||
 532                 (what == PW_BORDER && !pWin->borderIsPixel))
 533                 RootlessSetPixmapOfAncestors(pWin);
 534         }
 535     }
 536 #endif
 537
 538     if (what == PW_BACKGROUND) {
 539         while (pWin->backgroundState == ParentRelative)
 540             pWin = pWin->parent;
 541
 542         draw_x_off = drawable->x;
 543         draw_y_off = drawable->y;
 544
 545         tile_x_off = pWin->drawable.x - draw_x_off;
 546         tile_y_off = pWin->drawable.y - draw_y_off;
 547         fill = pWin->background;
 548 #ifdef COMPOSITE
 549         if (pWin->inhibitBGPaint)
 550             return;
 551 #endif
 552         switch (pWin->backgroundState) {
 553         case None:
 554             return;
 555         case BackgroundPixmap:
 556             solid = FALSE;
 557             break;
 558         }
 559     }
 560     else {
 561         PixmapPtr pixmap;
 562
 563         tile_x_off = drawable->x;
 564         tile_y_off = drawable->y;
 565
 566         /* servers without pixmaps draw their own borders */
 567         if (!pScreen->GetWindowPixmap)
 568             return;
 569         pixmap = (*pScreen->GetWindowPixmap) ((WindowPtr) drawable);
 570         drawable = &pixmap->drawable;
 571 #ifdef COMPOSITE
 572         draw_x_off = pixmap->screen_x;
 573         draw_y_off = pixmap->screen_y;
 574         tile_x_off -= draw_x_off;
 575         tile_y_off -= draw_y_off;
 576 #else
 577         draw_x_off = 0;
 578         draw_y_off = 0;
 579 #endif
 580         fill = pWin->border;
 581         solid = pWin->borderIsPixel;
 582     }
 583
 584     gcval[0].val = GXcopy;
 585     gcmask = GCFunction;
 586
 587 #ifdef ROOTLESS_SAFEALPHA
 588 /* Bit mask for alpha channel with a particular number of bits per
 589  * pixel. Note that we only care for 32bpp data. Mac OS X uses planar
 590  * alpha for 16bpp.
 591  */
 592 #define RootlessAlphaMask(bpp) ((bpp) == 32 ? 0xFF000000 : 0)
 593 #endif
 594
 595     if (solid) {
 596 #ifdef ROOTLESS_SAFEALPHA
 597         gcval[1].val =
 598             fill.pixel | RootlessAlphaMask(pWin->drawable.bitsPerPixel);
 599 #else
 600         gcval[1].val = fill.pixel;
 601 #endif
 602         gcval[2].val = FillSolid;
 603         gcmask |= GCForeground | GCFillStyle;
 604     }
 605     else {
 606         int c = 1;
 607
 608 #ifdef ROOTLESS_SAFEALPHA
 609         gcval[c++].val =
 610             ((CARD32) -1) & ~RootlessAlphaMask(pWin->drawable.bitsPerPixel);
 611         gcmask |= GCPlaneMask;
 612 #endif
 613         gcval[c++].val = FillTiled;
 614         gcval[c++].ptr = (pointer) fill.pixmap;
 615         gcval[c++].val = tile_x_off;
 616         gcval[c++].val = tile_y_off;
 617         gcmask |= GCFillStyle | GCTile | GCTileStipXOrigin | GCTileStipYOrigin;
 618     }
 619
 620     prect = malloc(RegionNumRects(prgn) * sizeof(xRectangle));
 621     if (!prect)
 622         return;
 623
 624     pGC = GetScratchGC(drawable->depth, drawable->pScreen);
 625     if (!pGC) {
 626         free(prect);
 627         return;
 628     }
 629
 630     ChangeGC(NullClient, pGC, gcmask, gcval);
 631     ValidateGC(drawable, pGC);
 632
 633     numRects = RegionNumRects(prgn);
 634     pbox = RegionRects(prgn);
 635     for (i = numRects; --i >= 0; pbox++, prect++) {
 636         prect->x = pbox->x1 - draw_x_off;
 637         prect->y = pbox->y1 - draw_y_off;
 638         prect->width = pbox->x2 - pbox->x1;
 639         prect->height = pbox->y2 - pbox->y1;
 640     }
 641     prect -= numRects;
 642     (*pGC->ops->PolyFillRect) (drawable, pGC, numRects, prect);
 643     free(prect);
 644
 645     FreeScratchGC(pGC);
 646 }
 647
 648 /* MICLEARDRAWABLE -- sets the entire drawable to the background color of
 649  * the GC.  Useful when we have a scratch drawable and need to initialize
 650  * it. */
 651 void
 652 miClearDrawable(DrawablePtr pDraw, GCPtr pGC)
 653 {
 654     ChangeGCVal fg, bg;
 655     xRectangle rect;
 656
 657     fg.val = pGC->fgPixel;
 658     bg.val = pGC->bgPixel;
 659     rect.x = 0;
 660     rect.y = 0;
 661     rect.width = pDraw->width;
 662     rect.height = pDraw->height;
 663     ChangeGC(NullClient, pGC, GCForeground, &bg);
 664     ValidateGC(pDraw, pGC);
 665     (*pGC->ops->PolyFillRect) (pDraw, pGC, 1, &rect);
 666     ChangeGC(NullClient, pGC, GCForeground, &fg);
 667     ValidateGC(pDraw, pGC);
 668 }