| 1 | /* |
| 2 | * Copyright © 1998 Keith Packard |
| 3 | * |
| 4 | * Permission to use, copy, modify, distribute, and sell this software and its |
| 5 | * documentation for any purpose is hereby granted without fee, provided that |
| 6 | * the above copyright notice appear in all copies and that both that |
| 7 | * copyright notice and this permission notice appear in supporting |
| 8 | * documentation, and that the name of Keith Packard not be used in |
| 9 | * advertising or publicity pertaining to distribution of the software without |
| 10 | * specific, written prior permission. Keith Packard makes no |
| 11 | * representations about the suitability of this software for any purpose. It |
| 12 | * is provided "as is" without express or implied warranty. |
| 13 | * |
| 14 | * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
| 15 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO |
| 16 | * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
| 17 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, |
| 18 | * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
| 19 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR |
| 20 | * PERFORMANCE OF THIS SOFTWARE. |
| 21 | */ |
| 22 | |
| 23 | #ifdef HAVE_DIX_CONFIG_H |
| 24 | #include <dix-config.h> |
| 25 | #endif |
| 26 | |
| 27 | #include "fb.h" |
| 28 | #include "mizerarc.h" |
| 29 | #include <limits.h> |
| 30 | |
| 31 | typedef void (*FbArc) (FbBits * dst, |
| 32 | FbStride dstStride, |
| 33 | int dstBpp, |
| 34 | xArc * arc, int dx, int dy, FbBits and, FbBits xor); |
| 35 | |
| 36 | void |
| 37 | fbPolyArc(DrawablePtr pDrawable, GCPtr pGC, int narcs, xArc * parcs) |
| 38 | { |
| 39 | FbArc arc; |
| 40 | |
| 41 | if (pGC->lineWidth == 0) { |
| 42 | arc = 0; |
| 43 | if (pGC->lineStyle == LineSolid && pGC->fillStyle == FillSolid) { |
| 44 | switch (pDrawable->bitsPerPixel) { |
| 45 | case 8: |
| 46 | arc = fbArc8; |
| 47 | break; |
| 48 | case 16: |
| 49 | arc = fbArc16; |
| 50 | break; |
| 51 | case 24: |
| 52 | arc = fbArc24; |
| 53 | break; |
| 54 | case 32: |
| 55 | arc = fbArc32; |
| 56 | break; |
| 57 | } |
| 58 | } |
| 59 | if (arc) { |
| 60 | FbGCPrivPtr pPriv = fbGetGCPrivate(pGC); |
| 61 | FbBits *dst; |
| 62 | FbStride dstStride; |
| 63 | int dstBpp; |
| 64 | int dstXoff, dstYoff; |
| 65 | BoxRec box; |
| 66 | int x2, y2; |
| 67 | RegionPtr cclip; |
| 68 | |
| 69 | #ifdef FB_ACCESS_WRAPPER |
| 70 | int wrapped = 1; |
| 71 | #endif |
| 72 | |
| 73 | cclip = fbGetCompositeClip(pGC); |
| 74 | fbGetDrawable(pDrawable, dst, dstStride, dstBpp, dstXoff, dstYoff); |
| 75 | while (narcs--) { |
| 76 | if (miCanZeroArc(parcs)) { |
| 77 | box.x1 = parcs->x + pDrawable->x; |
| 78 | box.y1 = parcs->y + pDrawable->y; |
| 79 | /* |
| 80 | * Because box.x2 and box.y2 get truncated to 16 bits, and the |
| 81 | * RECT_IN_REGION test treats the resulting number as a signed |
| 82 | * integer, the RECT_IN_REGION test alone can go the wrong way. |
| 83 | * This can result in a server crash because the rendering |
| 84 | * routines in this file deal directly with cpu addresses |
| 85 | * of pixels to be stored, and do not clip or otherwise check |
| 86 | * that all such addresses are within their respective pixmaps. |
| 87 | * So we only allow the RECT_IN_REGION test to be used for |
| 88 | * values that can be expressed correctly in a signed short. |
| 89 | */ |
| 90 | x2 = box.x1 + (int) parcs->width + 1; |
| 91 | box.x2 = x2; |
| 92 | y2 = box.y1 + (int) parcs->height + 1; |
| 93 | box.y2 = y2; |
| 94 | if ((x2 <= SHRT_MAX) && (y2 <= SHRT_MAX) && |
| 95 | (RegionContainsRect(cclip, &box) == rgnIN)) { |
| 96 | #ifdef FB_ACCESS_WRAPPER |
| 97 | if (!wrapped) { |
| 98 | fbPrepareAccess(pDrawable); |
| 99 | wrapped = 1; |
| 100 | } |
| 101 | #endif |
| 102 | (*arc) (dst, dstStride, dstBpp, |
| 103 | parcs, pDrawable->x + dstXoff, |
| 104 | pDrawable->y + dstYoff, pPriv->and, pPriv->xor); |
| 105 | } |
| 106 | else { |
| 107 | #ifdef FB_ACCESS_WRAPPER |
| 108 | if (wrapped) { |
| 109 | fbFinishAccess(pDrawable); |
| 110 | wrapped = 0; |
| 111 | } |
| 112 | #endif |
| 113 | miZeroPolyArc(pDrawable, pGC, 1, parcs); |
| 114 | } |
| 115 | } |
| 116 | else { |
| 117 | #ifdef FB_ACCESS_WRAPPER |
| 118 | if (wrapped) { |
| 119 | fbFinishAccess(pDrawable); |
| 120 | wrapped = 0; |
| 121 | } |
| 122 | #endif |
| 123 | miPolyArc(pDrawable, pGC, 1, parcs); |
| 124 | } |
| 125 | parcs++; |
| 126 | } |
| 127 | #ifdef FB_ACCESS_WRAPPER |
| 128 | if (wrapped) { |
| 129 | fbFinishAccess(pDrawable); |
| 130 | wrapped = 0; |
| 131 | } |
| 132 | #endif |
| 133 | } |
| 134 | else |
| 135 | miZeroPolyArc(pDrawable, pGC, narcs, parcs); |
| 136 | } |
| 137 | else |
| 138 | miPolyArc(pDrawable, pGC, narcs, parcs); |
| 139 | } |