1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright © 1998 Keith Packard
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Permission to use, copy, modify, distribute, and sell this software and its
5*4882a593Smuzhiyun * documentation for any purpose is hereby granted without fee, provided that
6*4882a593Smuzhiyun * the above copyright notice appear in all copies and that both that
7*4882a593Smuzhiyun * copyright notice and this permission notice appear in supporting
8*4882a593Smuzhiyun * documentation, and that the name of Keith Packard not be used in
9*4882a593Smuzhiyun * advertising or publicity pertaining to distribution of the software without
10*4882a593Smuzhiyun * specific, written prior permission. Keith Packard makes no
11*4882a593Smuzhiyun * representations about the suitability of this software for any purpose. It
12*4882a593Smuzhiyun * is provided "as is" without express or implied warranty.
13*4882a593Smuzhiyun *
14*4882a593Smuzhiyun * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
15*4882a593Smuzhiyun * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
16*4882a593Smuzhiyun * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
17*4882a593Smuzhiyun * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
18*4882a593Smuzhiyun * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
19*4882a593Smuzhiyun * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
20*4882a593Smuzhiyun * PERFORMANCE OF THIS SOFTWARE.
21*4882a593Smuzhiyun */
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun #ifdef HAVE_DIX_CONFIG_H
24*4882a593Smuzhiyun #include <dix-config.h>
25*4882a593Smuzhiyun #endif
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun #include "fb.h"
28*4882a593Smuzhiyun #include "mizerarc.h"
29*4882a593Smuzhiyun #include <limits.h>
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun typedef void (*FbArc) (FbBits * dst,
32*4882a593Smuzhiyun FbStride dstStride,
33*4882a593Smuzhiyun int dstBpp,
34*4882a593Smuzhiyun xArc * arc, int dx, int dy, FbBits and, FbBits xor);
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun void
fbPolyArc(DrawablePtr pDrawable,GCPtr pGC,int narcs,xArc * parcs)37*4882a593Smuzhiyun fbPolyArc(DrawablePtr pDrawable, GCPtr pGC, int narcs, xArc * parcs)
38*4882a593Smuzhiyun {
39*4882a593Smuzhiyun FbArc arc;
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun if (pGC->lineWidth == 0) {
42*4882a593Smuzhiyun arc = 0;
43*4882a593Smuzhiyun if (pGC->lineStyle == LineSolid && pGC->fillStyle == FillSolid) {
44*4882a593Smuzhiyun switch (pDrawable->bitsPerPixel) {
45*4882a593Smuzhiyun case 8:
46*4882a593Smuzhiyun arc = fbArc8;
47*4882a593Smuzhiyun break;
48*4882a593Smuzhiyun case 16:
49*4882a593Smuzhiyun arc = fbArc16;
50*4882a593Smuzhiyun break;
51*4882a593Smuzhiyun case 32:
52*4882a593Smuzhiyun arc = fbArc32;
53*4882a593Smuzhiyun break;
54*4882a593Smuzhiyun }
55*4882a593Smuzhiyun }
56*4882a593Smuzhiyun if (arc) {
57*4882a593Smuzhiyun FbGCPrivPtr pPriv = fbGetGCPrivate(pGC);
58*4882a593Smuzhiyun FbBits *dst;
59*4882a593Smuzhiyun FbStride dstStride;
60*4882a593Smuzhiyun int dstBpp;
61*4882a593Smuzhiyun int dstXoff, dstYoff;
62*4882a593Smuzhiyun BoxRec box;
63*4882a593Smuzhiyun int x2, y2;
64*4882a593Smuzhiyun RegionPtr cclip;
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun #ifdef FB_ACCESS_WRAPPER
67*4882a593Smuzhiyun int wrapped = 1;
68*4882a593Smuzhiyun #endif
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun cclip = fbGetCompositeClip(pGC);
71*4882a593Smuzhiyun fbGetDrawable(pDrawable, dst, dstStride, dstBpp, dstXoff, dstYoff);
72*4882a593Smuzhiyun while (narcs--) {
73*4882a593Smuzhiyun if (miCanZeroArc(parcs)) {
74*4882a593Smuzhiyun box.x1 = parcs->x + pDrawable->x;
75*4882a593Smuzhiyun box.y1 = parcs->y + pDrawable->y;
76*4882a593Smuzhiyun /*
77*4882a593Smuzhiyun * Because box.x2 and box.y2 get truncated to 16 bits, and the
78*4882a593Smuzhiyun * RECT_IN_REGION test treats the resulting number as a signed
79*4882a593Smuzhiyun * integer, the RECT_IN_REGION test alone can go the wrong way.
80*4882a593Smuzhiyun * This can result in a server crash because the rendering
81*4882a593Smuzhiyun * routines in this file deal directly with cpu addresses
82*4882a593Smuzhiyun * of pixels to be stored, and do not clip or otherwise check
83*4882a593Smuzhiyun * that all such addresses are within their respective pixmaps.
84*4882a593Smuzhiyun * So we only allow the RECT_IN_REGION test to be used for
85*4882a593Smuzhiyun * values that can be expressed correctly in a signed short.
86*4882a593Smuzhiyun */
87*4882a593Smuzhiyun x2 = box.x1 + (int) parcs->width + 1;
88*4882a593Smuzhiyun box.x2 = x2;
89*4882a593Smuzhiyun y2 = box.y1 + (int) parcs->height + 1;
90*4882a593Smuzhiyun box.y2 = y2;
91*4882a593Smuzhiyun if ((x2 <= SHRT_MAX) && (y2 <= SHRT_MAX) &&
92*4882a593Smuzhiyun (RegionContainsRect(cclip, &box) == rgnIN)) {
93*4882a593Smuzhiyun #ifdef FB_ACCESS_WRAPPER
94*4882a593Smuzhiyun if (!wrapped) {
95*4882a593Smuzhiyun fbPrepareAccess(pDrawable);
96*4882a593Smuzhiyun wrapped = 1;
97*4882a593Smuzhiyun }
98*4882a593Smuzhiyun #endif
99*4882a593Smuzhiyun (*arc) (dst, dstStride, dstBpp,
100*4882a593Smuzhiyun parcs, pDrawable->x + dstXoff,
101*4882a593Smuzhiyun pDrawable->y + dstYoff, pPriv->and, pPriv->xor);
102*4882a593Smuzhiyun }
103*4882a593Smuzhiyun else {
104*4882a593Smuzhiyun #ifdef FB_ACCESS_WRAPPER
105*4882a593Smuzhiyun if (wrapped) {
106*4882a593Smuzhiyun fbFinishAccess(pDrawable);
107*4882a593Smuzhiyun wrapped = 0;
108*4882a593Smuzhiyun }
109*4882a593Smuzhiyun #endif
110*4882a593Smuzhiyun miZeroPolyArc(pDrawable, pGC, 1, parcs);
111*4882a593Smuzhiyun }
112*4882a593Smuzhiyun }
113*4882a593Smuzhiyun else {
114*4882a593Smuzhiyun #ifdef FB_ACCESS_WRAPPER
115*4882a593Smuzhiyun if (wrapped) {
116*4882a593Smuzhiyun fbFinishAccess(pDrawable);
117*4882a593Smuzhiyun wrapped = 0;
118*4882a593Smuzhiyun }
119*4882a593Smuzhiyun #endif
120*4882a593Smuzhiyun miPolyArc(pDrawable, pGC, 1, parcs);
121*4882a593Smuzhiyun }
122*4882a593Smuzhiyun parcs++;
123*4882a593Smuzhiyun }
124*4882a593Smuzhiyun #ifdef FB_ACCESS_WRAPPER
125*4882a593Smuzhiyun if (wrapped) {
126*4882a593Smuzhiyun fbFinishAccess(pDrawable);
127*4882a593Smuzhiyun wrapped = 0;
128*4882a593Smuzhiyun }
129*4882a593Smuzhiyun #endif
130*4882a593Smuzhiyun }
131*4882a593Smuzhiyun else
132*4882a593Smuzhiyun miZeroPolyArc(pDrawable, pGC, narcs, parcs);
133*4882a593Smuzhiyun }
134*4882a593Smuzhiyun else
135*4882a593Smuzhiyun miPolyArc(pDrawable, pGC, narcs, parcs);
136*4882a593Smuzhiyun }
137