summaryrefslogtreecommitdiff
path: root/fb/fbarc.c
blob: 33e44b0c6bb76ff2983d63917c366a7371f183b3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
/*
 * 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)
    {
#ifndef FBNOPIXADDR
	arc = 0;
	if (pGC->lineStyle == LineSolid && pGC->fillStyle == FillSolid)
	{
	    switch (pDrawable->bitsPerPixel)
	    {
	    case 8:	arc = fbArc8; break;
	    case 16:    arc = fbArc16; break;
#ifdef FB_24BIT
	    case 24:	arc = fbArc24; break;
#endif
	    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;
	    int		wrapped = 0;
	    
	    cclip = fbGetCompositeClip (pGC);
	    fbGetDrawable (pDrawable, dst, dstStride, dstBpp, dstXoff, dstYoff);
#ifdef FB_ACCESS_WRAPPER
	    wrapped = 1;
#else
	    wrapped = 0;
#endif
	    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
#endif
	    miZeroPolyArc (pDrawable, pGC, narcs, parcs);
    }
    else
	miPolyArc (pDrawable, pGC, narcs, parcs);
}