/* * 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 24: arc = fbArc24; 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); }