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
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
/* $XFree86: xc/programs/Xserver/afb/afbzerarc.c,v 3.0 1996/08/18 01:45:59 dawes Exp $ */
/************************************************************
Copyright (c) 1989 X Consortium
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of the X Consortium shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from the X Consortium.
********************************************************/
/* $XConsortium: afbzerarc.c,v 5.19 94/04/17 20:28:37 dpw Exp $ */
/* Derived from:
* "Algorithm for drawing ellipses or hyperbolae with a digital plotter"
* by M. L. V. Pitteway
* The Computer Journal, November 1967, Volume 10, Number 3, pp. 282-289
*/
#include "X.h"
#include "Xprotostr.h"
#include "miscstruct.h"
#include "gcstruct.h"
#include "pixmapstr.h"
#include "scrnintstr.h"
#include "afb.h"
#include "maskbits.h"
#include "mizerarc.h"
#include "mi.h"
/*
* Note: LEFTMOST must be the bit leftmost in the actual screen
* representation. This depends also on the IMAGE_BYTE_ORDER.
* LONG2CHARS() takes care of the re-ordering as required. (DHD)
*/
#if (BITMAP_BIT_ORDER == MSBFirst)
#define LEFTMOST ((PixelType) LONG2CHARS((1 << PLST)))
#else
#define LEFTMOST ((PixelType) LONG2CHARS(1))
#endif
#define Pixelate(base,yoff,xoff) \
{ \
paddr = afbScanlineOffset(base, (yoff) + ((xoff)>>PWSH)); \
pmask = SCRRIGHT(LEFTMOST, (xoff) & PIM); \
for (de = 0; de < depthDst; de++, paddr += sizeDst) /* @@@ NEXT PLANE @@@ */ \
switch (rrops[de]) { \
case RROP_BLACK: \
*paddr &= ~pmask; \
break; \
case RROP_WHITE: \
*paddr |= pmask; \
break; \
case RROP_INVERT: \
*paddr ^= pmask; \
break; \
case RROP_NOP: \
break; \
} \
}
#define DoPix(bit,base,yoff,xoff) if (mask & bit) Pixelate(base,yoff,xoff);
static void
afbZeroArcSS(pDraw, pGC, arc)
DrawablePtr pDraw;
GCPtr pGC;
xArc *arc;
{
miZeroArcRec info;
Bool do360;
register int de;
register int x, y, a, b, d, mask;
register int k1, k3, dx, dy;
PixelType *addrl;
PixelType *yorgl, *yorgol;
PixelType pixel;
int nlwidth, yoffset, dyoffset;
int sizeDst, depthDst;
PixelType pmask;
register PixelType *paddr;
register unsigned char *rrops;
rrops = ((afbPrivGC *)(pGC->devPrivates[afbGCPrivateIndex].ptr))->rrops;
afbGetPixelWidthSizeDepthAndPointer(pDraw, nlwidth, sizeDst, depthDst,
addrl);
do360 = miZeroArcSetup(arc, &info, TRUE);
yorgl = addrl + ((info.yorg + pDraw->y) * nlwidth);
yorgol = addrl + ((info.yorgo + pDraw->y) * nlwidth);
info.xorg += pDraw->x;
info.xorgo += pDraw->x;
MIARCSETUP();
yoffset = y ? nlwidth : 0;
dyoffset = 0;
mask = info.initialMask;
if (!(arc->width & 1)) {
DoPix(2, yorgl, 0, info.xorgo);
DoPix(8, yorgol, 0, info.xorgo);
}
if (!info.end.x || !info.end.y) {
mask = info.end.mask;
info.end = info.altend;
}
if (do360 && (arc->width == arc->height) && !(arc->width & 1)) {
int xoffset = nlwidth;
PixelType *yorghl = afbScanlineDeltaNoBankSwitch(yorgl, info.h, nlwidth);
int xorghp = info.xorg + info.h;
int xorghn = info.xorg - info.h;
while (1) {
Pixelate(yorgl, yoffset, info.xorg + x);
Pixelate(yorgl, yoffset, info.xorg - x);
Pixelate(yorgol, -yoffset, info.xorg - x);
Pixelate(yorgol, -yoffset, info.xorg + x);
if (a < 0)
break;
Pixelate(yorghl, -xoffset, xorghp - y);
Pixelate(yorghl, -xoffset, xorghn + y);
Pixelate(yorghl, xoffset, xorghn + y);
Pixelate(yorghl, xoffset, xorghp - y);
xoffset += nlwidth;
MIARCCIRCLESTEP(yoffset += nlwidth;);
}
x = info.w;
yoffset = info.h * nlwidth;
} else if (do360) {
while (y < info.h || x < info.w) {
MIARCOCTANTSHIFT(dyoffset = nlwidth;);
Pixelate(yorgl, yoffset, info.xorg + x);
Pixelate(yorgl, yoffset, info.xorgo - x);
Pixelate(yorgol, -yoffset, info.xorgo - x);
Pixelate(yorgol, -yoffset, info.xorg + x);
MIARCSTEP(yoffset += dyoffset;, yoffset += nlwidth;);
}
} else {
while (y < info.h || x < info.w) {
MIARCOCTANTSHIFT(dyoffset = nlwidth;);
if ((x == info.start.x) || (y == info.start.y)) {
mask = info.start.mask;
info.start = info.altstart;
}
DoPix(1, yorgl, yoffset, info.xorg + x);
DoPix(2, yorgl, yoffset, info.xorgo - x);
DoPix(4, yorgol, -yoffset, info.xorgo - x);
DoPix(8, yorgol, -yoffset, info.xorg + x);
if ((x == info.end.x) || (y == info.end.y)) {
mask = info.end.mask;
info.end = info.altend;
}
MIARCSTEP(yoffset += dyoffset;, yoffset += nlwidth;);
}
}
if ((x == info.start.x) || (y == info.start.y))
mask = info.start.mask;
DoPix(1, yorgl, yoffset, info.xorg + x);
DoPix(4, yorgol, -yoffset, info.xorgo - x);
if (arc->height & 1) {
DoPix(2, yorgl, yoffset, info.xorgo - x);
DoPix(8, yorgol, -yoffset, info.xorg + x);
}
}
void
afbZeroPolyArcSS(pDraw, pGC, narcs, parcs)
DrawablePtr pDraw;
GCPtr pGC;
int narcs;
xArc *parcs;
{
register xArc *arc;
register int i;
BoxRec box;
RegionPtr cclip;
cclip = pGC->pCompositeClip;
for (arc = parcs, i = narcs; --i >= 0; arc++) {
if (miCanZeroArc(arc)) {
box.x1 = arc->x + pDraw->x;
box.y1 = arc->y + pDraw->y;
box.x2 = box.x1 + (int)arc->width + 1;
box.y2 = box.y1 + (int)arc->height + 1;
if (RECT_IN_REGION(pDraw->pScreen, cclip, &box) == rgnIN)
afbZeroArcSS(pDraw, pGC, arc);
else
miZeroPolyArc(pDraw, pGC, 1, arc);
} else
miPolyArc(pDraw, pGC, 1, arc);
}
}
|
