IABSD.fr/xenocara/xserver/fb/fbarc.c

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• Author : matthieu
  Date : 2019-07-27 07:57:06
  Hash : a77e9959
  Message : Update to xserver 1.20.5. Tested by jsg@

• xserver/fb/fbarc.c

• /*
   * Copyright © 1998 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 "fb.h"
  #include "mizerarc.h"
  #include <limits.h>
  
  typedef void (*FbArc) (FbBits * dst,
                         FbStride dstStride,
                         int dstBpp,
                         xArc * arc, int dx, int dy, FbBits and, FbBits xor);
  
  void
  fbPolyArc(DrawablePtr pDrawable, GCPtr pGC, int narcs, xArc * parcs)
  {
      FbArc arc;
  
      if (pGC->lineWidth == 0) {
          arc = 0;
          if (pGC->lineStyle == LineSolid && pGC->fillStyle == FillSolid) {
              switch (pDrawable->bitsPerPixel) {
              case 8:
                  arc = fbArc8;
                  break;
              case 16:
                  arc = fbArc16;
                  break;
              case 32:
                  arc = fbArc32;
                  break;
              }
          }
          if (arc) {
              FbGCPrivPtr pPriv = fbGetGCPrivate(pGC);
              FbBits *dst;
              FbStride dstStride;
              int dstBpp;
              int dstXoff, dstYoff;
              BoxRec box;
              int x2, y2;
              RegionPtr cclip;
  
  #ifdef FB_ACCESS_WRAPPER
              int wrapped = 1;
  #endif
  
              cclip = fbGetCompositeClip(pGC);
              fbGetDrawable(pDrawable, dst, dstStride, dstBpp, dstXoff, dstYoff);
              while (narcs--) {
                  if (miCanZeroArc(parcs)) {
                      box.x1 = parcs->x + pDrawable->x;
                      box.y1 = parcs->y + pDrawable->y;
                      /*
                       * Because box.x2 and box.y2 get truncated to 16 bits, and the
                       * RECT_IN_REGION test treats the resulting number as a signed
                       * integer, the RECT_IN_REGION test alone can go the wrong way.
                       * This can result in a server crash because the rendering
                       * routines in this file deal directly with cpu addresses
                       * of pixels to be stored, and do not clip or otherwise check
                       * that all such addresses are within their respective pixmaps.
                       * So we only allow the RECT_IN_REGION test to be used for
                       * values that can be expressed correctly in a signed short.
                       */
                      x2 = box.x1 + (int) parcs->width + 1;
                      box.x2 = x2;
                      y2 = box.y1 + (int) parcs->height + 1;
                      box.y2 = y2;
                      if ((x2 <= SHRT_MAX) && (y2 <= SHRT_MAX) &&
                          (RegionContainsRect(cclip, &box) == rgnIN)) {
  #ifdef FB_ACCESS_WRAPPER
                          if (!wrapped) {
                              fbPrepareAccess(pDrawable);
                              wrapped = 1;
                          }
  #endif
                          (*arc) (dst, dstStride, dstBpp,
                                  parcs, pDrawable->x + dstXoff,
                                  pDrawable->y + dstYoff, pPriv->and, pPriv->xor);
                      }
                      else {
  #ifdef FB_ACCESS_WRAPPER
                          if (wrapped) {
                              fbFinishAccess(pDrawable);
                              wrapped = 0;
                          }
  #endif
                          miZeroPolyArc(pDrawable, pGC, 1, parcs);
                      }
                  }
                  else {
  #ifdef FB_ACCESS_WRAPPER
                      if (wrapped) {
                          fbFinishAccess(pDrawable);
                          wrapped = 0;
                      }
  #endif
                      miPolyArc(pDrawable, pGC, 1, parcs);
                  }
                  parcs++;
              }
  #ifdef FB_ACCESS_WRAPPER
              if (wrapped) {
                  fbFinishAccess(pDrawable);
                  wrapped = 0;
              }
  #endif
          }
          else
              miZeroPolyArc(pDrawable, pGC, narcs, parcs);
      }
      else
          miPolyArc(pDrawable, pGC, narcs, parcs);
  }