fbarc.c revision 05b261ec 
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,
35			  int	    dx,
36			  int	    dy,
37			  FbBits    and,
38			  FbBits    xor);
39
40void
41fbPolyArc (DrawablePtr	pDrawable,
42	   GCPtr	pGC,
43	   int		narcs,
44	   xArc		*parcs)
45{
46    FbArc	arc;
47
48    if (pGC->lineWidth == 0)
49    {
50#ifndef FBNOPIXADDR
51	arc = 0;
52	if (pGC->lineStyle == LineSolid && pGC->fillStyle == FillSolid)
53	{
54	    switch (pDrawable->bitsPerPixel)
55	    {
56	    case 8:	arc = fbArc8; break;
57	    case 16:    arc = fbArc16; break;
58#ifdef FB_24BIT
59	    case 24:	arc = fbArc24; break;
60#endif
61	    case 32:    arc = fbArc32; break;
62	    }
63	}
64	if (arc)
65	{
66	    FbGCPrivPtr	pPriv = fbGetGCPrivate (pGC);
67	    FbBits	*dst;
68	    FbStride	dstStride;
69	    int		dstBpp;
70	    int		dstXoff, dstYoff;
71	    BoxRec	box;
72	    int		x2, y2;
73	    RegionPtr	cclip;
74
75	    cclip = fbGetCompositeClip (pGC);
76	    fbGetDrawable (pDrawable, dst, dstStride, dstBpp, dstXoff, dstYoff);
77	    while (narcs--)
78	    {
79		if (miCanZeroArc (parcs))
80		{
81		    box.x1 = parcs->x + pDrawable->x;
82		    box.y1 = parcs->y + pDrawable->y;
83		    /*
84		     * Because box.x2 and box.y2 get truncated to 16 bits, and the
85		     * RECT_IN_REGION test treats the resulting number as a signed
86		     * integer, the RECT_IN_REGION test alone can go the wrong way.
87		     * This can result in a server crash because the rendering
88		     * routines in this file deal directly with cpu addresses
89		     * of pixels to be stored, and do not clip or otherwise check
90		     * that all such addresses are within their respective pixmaps.
91		     * So we only allow the RECT_IN_REGION test to be used for
92		     * values that can be expressed correctly in a signed short.
93		     */
94		    x2 = box.x1 + (int)parcs->width + 1;
95		    box.x2 = x2;
96		    y2 = box.y1 + (int)parcs->height + 1;
97		    box.y2 = y2;
98		    if ( (x2 <= SHRT_MAX) && (y2 <= SHRT_MAX) &&
99			(RECT_IN_REGION(pDrawable->pScreen, cclip, &box) == rgnIN) )
100			(*arc) (dst, dstStride, dstBpp,
101				parcs, pDrawable->x + dstXoff, pDrawable->y + dstYoff,
102				pPriv->and, pPriv->xor);
103		    else
104			miZeroPolyArc(pDrawable, pGC, 1, parcs);
105		}
106		else
107		    miPolyArc(pDrawable, pGC, 1, parcs);
108		parcs++;
109	    }
110	    fbFinishAccess (pDrawable);
111	}
112	else
113#endif
114	    miZeroPolyArc (pDrawable, pGC, narcs, parcs);
115    }
116    else
117	miPolyArc (pDrawable, pGC, narcs, parcs);
118}
119