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
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
|
/* $XFree86$ */
/* Combined Purdue/PurduePlus patches, level 2.0, 1/17/89 */
/***********************************************************
Copyright (c) 1987 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.
Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
All Rights Reserved
Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
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 Digital not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.
DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
DIGITAL 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.
******************************************************************/
/* $XConsortium: afbbres.c,v 1.22 94/04/17 20:28:17 dpw Exp $ */
#include <X11/X.h>
#include <X11/misc.h>
#include "afb.h"
#include "maskbits.h"
#include "miline.h"
/* Solid bresenham line */
/* NOTES
e2 is used less often than e1, so it's not in a register
*/
void
afbBresS(addrlbase, nlwidth, sizeDst, depthDst, signdx, signdy, axis, x1, y1,
e, e1, e2, len, rrops)
PixelType *addrlbase; /* pointer to base of bitmap */
int nlwidth; /* width in longwords of bitmap */
int sizeDst;
int depthDst;
int signdx, signdy; /* signs of directions */
int axis; /* major axis (Y_AXIS or X_AXIS) */
int x1, y1; /* initial point */
register int e; /* error accumulator */
register int e1; /* bresenham increments */
int e2;
int len; /* length of line */
unsigned char *rrops;
{
register int yinc; /* increment to next scanline, in bytes */
register PixelType *addrl; /* bitmask long pointer */
register PixelType bit; /* current bit being set/cleared/etc. */
PixelType leftbit = mfbGetmask(0); /* leftmost bit to process in new word */
PixelType rightbit = mfbGetmask(PPW-1); /* rightmost bit to process in new word */
register int e3 = e2-e1;
PixelType tmp;
int saveE;
int saveLen;
int d;
/* point to longword containing first point */
yinc = signdy * nlwidth;
e = e-e1; /* to make looping easier */
if (!len)
return;
saveLen = len;
saveE = e;
for (d = 0; d < depthDst; d++) {
addrl = afbScanline(addrlbase, x1, y1, nlwidth);
addrlbase += sizeDst; /* @@@ NEXT PLANE @@@ */
len = saveLen;
e = saveE;
bit = mfbGetmask(x1 & PIM);
switch (rrops[d]) {
case RROP_BLACK:
if (axis == X_AXIS) {
if (signdx > 0) {
tmp = *addrl;
for (;;) {
tmp &= ~bit;
if (!--len)
break;
bit = SCRRIGHT(bit,1);
e += e1;
if (e >= 0) {
*addrl = tmp;
afbScanlineInc(addrl, yinc);
e += e3;
if (!bit) {
bit = leftbit;
addrl ++;
}
tmp = *addrl;
} else if (!bit) {
*addrl = tmp;
bit = leftbit;
addrl ++;
tmp = *addrl;
}
}
*addrl = tmp;
} else {
tmp = *addrl;
for (;;) {
tmp &= ~bit;
if (!--len)
break;
e += e1;
bit = SCRLEFT(bit,1);
if (e >= 0) {
*addrl = tmp;
afbScanlineInc(addrl, yinc);
e += e3;
if (!bit) {
bit = rightbit;
addrl --;
}
tmp = *addrl;
} else if (!bit) {
*addrl = tmp;
bit = rightbit;
addrl --;
tmp = *addrl;
}
}
*addrl = tmp;
}
} /* if X_AXIS */ else {
if (signdx > 0) {
while(len--) {
*addrl &= ~bit;
e += e1;
if (e >= 0) {
bit = SCRRIGHT(bit,1);
if (!bit) { bit = leftbit;addrl ++; }
e += e3;
}
afbScanlineInc(addrl, yinc);
}
} else {
while(len--) {
*addrl &= ~bit;
e += e1;
if (e >= 0) {
bit = SCRLEFT(bit,1);
if (!bit) { bit = rightbit;addrl --; }
e += e3;
}
afbScanlineInc(addrl, yinc);
}
}
} /* else Y_AXIS */
break;
case RROP_WHITE:
if (axis == X_AXIS) {
if (signdx > 0) {
tmp = *addrl;
for (;;) {
tmp |= bit;
if (!--len)
break;
e += e1;
bit = SCRRIGHT(bit,1);
if (e >= 0) {
*addrl = tmp;
afbScanlineInc(addrl, yinc);
e += e3;
if (!bit) {
bit = leftbit;
addrl ++;
}
tmp = *addrl;
} else if (!bit) {
*addrl = tmp;
bit = leftbit;
addrl ++;
tmp = *addrl;
}
}
*addrl = tmp;
} else {
tmp = *addrl;
for (;;) {
tmp |= bit;
if (!--len)
break;
e += e1;
bit = SCRLEFT(bit,1);
if (e >= 0) {
*addrl = tmp;
afbScanlineInc(addrl, yinc);
e += e3;
if (!bit) {
bit = rightbit;
addrl --;
}
tmp = *addrl;
} else if (!bit) {
*addrl = tmp;
bit = rightbit;
addrl --;
tmp = *addrl;
}
}
*addrl = tmp;
}
} /* if X_AXIS */ else {
if (signdx > 0) {
while(len--) {
*addrl |= bit;
e += e1;
if (e >= 0) {
bit = SCRRIGHT(bit,1);
if (!bit) { bit = leftbit;addrl ++; }
e += e3;
}
afbScanlineInc(addrl, yinc);
}
} else {
while(len--) {
*addrl |= bit;
e += e1;
if (e >= 0) {
bit = SCRLEFT(bit,1);
if (!bit) { bit = rightbit;addrl --; }
e += e3;
}
afbScanlineInc(addrl, yinc);
}
}
} /* else Y_AXIS */
break;
case RROP_INVERT:
if (axis == X_AXIS) {
if (signdx > 0) {
while(len--) {
*addrl ^= bit;
e += e1;
if (e >= 0) {
afbScanlineInc(addrl, yinc);
e += e3;
}
bit = SCRRIGHT(bit,1);
if (!bit) { bit = leftbit;addrl ++; }
}
} else {
while(len--) {
*addrl ^= bit;
e += e1;
if (e >= 0) {
afbScanlineInc(addrl, yinc);
e += e3;
}
bit = SCRLEFT(bit,1);
if (!bit) { bit = rightbit;addrl --; }
}
}
} /* if X_AXIS */ else {
if (signdx > 0) {
while(len--) {
*addrl ^= bit;
e += e1;
if (e >= 0) {
bit = SCRRIGHT(bit,1);
if (!bit) { bit = leftbit;addrl ++; }
e += e3;
}
afbScanlineInc(addrl, yinc);
}
} else {
while(len--) {
*addrl ^= bit;
e += e1;
if (e >= 0) {
bit = SCRLEFT(bit,1);
if (!bit) { bit = rightbit; addrl --; }
e += e3;
}
afbScanlineInc(addrl, yinc);
}
}
} /* else Y_AXIS */
} /* switch */
} /* for (d = ... ) */
}
|
