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
31typedef void (*FbArc) (FbBits * dst,
32                       FbStride dstStride,
33                       int dstBpp,
34                       xArc * arc, int dx, int dy, FbBits and, FbBits xor);
35
36void
37fbPolyArc(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