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
fbPolyArc(DrawablePtr pDrawable,GCPtr pGC,int narcs,xArc * parcs)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 32:
52 arc = fbArc32;
53 break;
54 }
55 }
56 if (arc) {
57 FbGCPrivPtr pPriv = fbGetGCPrivate(pGC);
58 FbBits *dst;
59 FbStride dstStride;
60 int dstBpp;
61 int dstXoff, dstYoff;
62 BoxRec box;
63 int x2, y2;
64 RegionPtr cclip;
65
66 #ifdef FB_ACCESS_WRAPPER
67 int wrapped = 1;
68 #endif
69
70 cclip = fbGetCompositeClip(pGC);
71 fbGetDrawable(pDrawable, dst, dstStride, dstBpp, dstXoff, dstYoff);
72 while (narcs--) {
73 if (miCanZeroArc(parcs)) {
74 box.x1 = parcs->x + pDrawable->x;
75 box.y1 = parcs->y + pDrawable->y;
76 /*
77 * Because box.x2 and box.y2 get truncated to 16 bits, and the
78 * RECT_IN_REGION test treats the resulting number as a signed
79 * integer, the RECT_IN_REGION test alone can go the wrong way.
80 * This can result in a server crash because the rendering
81 * routines in this file deal directly with cpu addresses
82 * of pixels to be stored, and do not clip or otherwise check
83 * that all such addresses are within their respective pixmaps.
84 * So we only allow the RECT_IN_REGION test to be used for
85 * values that can be expressed correctly in a signed short.
86 */
87 x2 = box.x1 + (int) parcs->width + 1;
88 box.x2 = x2;
89 y2 = box.y1 + (int) parcs->height + 1;
90 box.y2 = y2;
91 if ((x2 <= SHRT_MAX) && (y2 <= SHRT_MAX) &&
92 (RegionContainsRect(cclip, &box) == rgnIN)) {
93 #ifdef FB_ACCESS_WRAPPER
94 if (!wrapped) {
95 fbPrepareAccess(pDrawable);
96 wrapped = 1;
97 }
98 #endif
99 (*arc) (dst, dstStride, dstBpp,
100 parcs, pDrawable->x + dstXoff,
101 pDrawable->y + dstYoff, pPriv->and, pPriv->xor);
102 }
103 else {
104 #ifdef FB_ACCESS_WRAPPER
105 if (wrapped) {
106 fbFinishAccess(pDrawable);
107 wrapped = 0;
108 }
109 #endif
110 miZeroPolyArc(pDrawable, pGC, 1, parcs);
111 }
112 }
113 else {
114 #ifdef FB_ACCESS_WRAPPER
115 if (wrapped) {
116 fbFinishAccess(pDrawable);
117 wrapped = 0;
118 }
119 #endif
120 miPolyArc(pDrawable, pGC, 1, parcs);
121 }
122 parcs++;
123 }
124 #ifdef FB_ACCESS_WRAPPER
125 if (wrapped) {
126 fbFinishAccess(pDrawable);
127 wrapped = 0;
128 }
129 #endif
130 }
131 else
132 miZeroPolyArc(pDrawable, pGC, narcs, parcs);
133 }
134 else
135 miPolyArc(pDrawable, pGC, narcs, parcs);
136 }
137