aboutsummaryrefslogtreecommitdiffstats
path: root/XWindow.c
blob: 96bdacd6e6800b289b4b157216fcbcc8983877f8 (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
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
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
/* $Id: XWindow.c,v 1.30 2003/02/22 07:53:10 reinelt Exp $
 *
 * X11 Driver for LCD4Linux 
 *
 * (c) 2000 Herbert Rosmanith <herp@widsau.idv.uni-linz.ac.at>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 * $Log: XWindow.c,v $
 * Revision 1.30  2003/02/22 07:53:10  reinelt
 * cfg_get(key,defval)
 *
 * Revision 1.29  2003/02/18 06:13:44  reinelt
 * X11 driver fixes and cleanup
 *
 * Revision 1.28  2003/02/17 06:06:12  reinelt
 * small bug in X11 driver: omit pixel gap between cahracters
 *
 * Revision 1.27  2002/08/19 04:41:20  reinelt
 * introduced bar.c, moved bar stuff from display.h to bar.h
 *
 * Revision 1.26  2001/08/05 17:13:29  reinelt
 *
 * cleaned up inlude of sys/time.h and time.h
 *
 * Revision 1.25  2001/03/16 16:40:17  ltoetsch
 * implemented time bar
 *
 * Revision 1.24  2001/03/01 11:08:16  reinelt
 *
 * reworked configure to allow selection of drivers
 *
 * Revision 1.23  2001/02/26 00:33:37  herp
 * fixed X11 signal handler
 *
 * Revision 1.22  2001/02/13 09:00:13  reinelt
 *
 * prepared framework for GPO's (general purpose outputs)
 *
 * Revision 1.21  2000/08/10 18:42:20  reinelt
 *
 * fixed some bugs with the new syslog code
 *
 * Revision 1.20  2000/08/10 09:44:09  reinelt
 *
 * new debugging scheme: error(), info(), debug()
 * uses syslog if in daemon mode
 *
 * Revision 1.19  2000/08/09 09:50:29  reinelt
 *
 * opened 0.98 development
 * removed driver-specific signal-handlers
 * added 'quit'-function to driver structure
 * added global signal-handler
 *
 * Revision 1.18  2000/05/02 23:07:48  herp
 * Crystalfontz initial coding
 *
 * Revision 1.17  2000/04/05 05:58:36  reinelt
 *
 * fixed bug in XWindow.c: union semun isn't defined with glibc-2.1
 *
 * Revision 1.16  2000/04/03 23:53:23  herp
 * fixed a bug that caused pixel-errors ("fliegendreck") under high load
 *
 * Revision 1.15  2000/04/03 04:01:31  reinelt
 *
 * if 'gap' is specified as -1, a gap of (pixelsize+pixelgap) is selected automatically
 *
 * Revision 1.14  2000/04/02 22:07:10  herp
 * fixded a bug that occasionally caused Xlib errors
 *
 * Revision 1.13  2000/04/01 22:40:42  herp
 * geometric correction (too many pixelgaps)
 * lcd4linux main should return int, not void
 *
 * Revision 1.12  2000/04/01 19:33:45  herp
 *
 * colors in format \#RRGGBB in config-file now understood
 *
 * Revision 1.11  2000/04/01 16:22:38  reinelt
 *
 * bug that caused a segfault in processor.c fixed (thanks to herp)
 *
 * Revision 1.10  2000/03/31 01:42:11  herp
 *
 * semaphore bug fixed
 *
 * Revision 1.9  2000/03/30 16:46:57  reinelt
 *
 * configure now handles '--with-x' and '--without-x' correct
 *
 * Revision 1.8  2000/03/28 08:48:33  reinelt
 *
 * README.X11 added
 *
 * Revision 1.7  2000/03/28 07:22:15  reinelt
 *
 * version 0.95 released
 * X11 driver up and running
 * minor bugs fixed
 *
 */

/* 
 *
 * exported fuctions:
 *
 * struct LCD XWindow[]
 *
 */


/*
 * Mon Feb 26 02:07:52 MET 2001 fixed sighandler
 * Tue Apr  4 02:37:38 MET 2000 fixed a bug that caused pixelerrors under h/load
 * Sun Apr  2 22:07:10 MET 2000 fixed a bug that occasionally caused Xlib error
 * Sun Apr  2 01:32:48 MET 2000 geometric correction (too many pixelgaps)
 * Sat Apr  1 22:18:04 MET 2000 colors in format \#RRGGBB in config-file
 * Fri Mar 31 01:42:11 MET 2000 semaphore bug fixed
 * Sun Mar 26 15:28:23 MET 2000 various rewrites
 * Sat Mar 25 23:58:19 MET 2000 use generic pixmap driver
 * Thu Mar 23 01:05:07 MET 2000 multithreading, synchronization
 * Tue Mar 21 22:22:03 MET 2000 initial coding
 *
 */

#include	<X11/Xlib.h>
#include	<X11/Xutil.h>
#include	<stdio.h>
#include	<stdlib.h>
#include	<string.h>
#include	<errno.h>
#include	<sys/types.h>
#include	<sys/wait.h>
#include	<sys/ipc.h>
#include	<sys/sem.h>
#include	<sys/shm.h>
#include	<unistd.h>
#include        <signal.h>

#include        "debug.h"
#include	"cfg.h"
#include	"display.h"
#include        "bar.h"
#include	"pixmap.h"


/* glibc 2.1 requires defining semun ourselves */
#ifdef _SEM_SEMUN_UNDEFINED
union semun {
  int val;
  struct semid_ds *buf;
  unsigned short int *array;
  struct seminfo *__buf;
};
#endif


static LCD Lcd;
static Display *dp;
static int sc;
static Window w,rw;
static Visual *vi;
static int dd;
static Colormap cm;
static GC gc,gcb,gch;
static XColor co[3];
static Pixmap pmback;

static unsigned char *LCDpixmap2;
static char *rgbfg,*rgbbg,*rgbhg;
static int pixel=-1;			/*pointsize in pixel*/
static int pgap=0;			/*gap between points */
static int rgap=0;			/*row gap between lines*/
static int cgap=0;			/*column gap between characters*/
static int border=0;			/*window border*/
static int rows=-1,cols=-1;		/*rows+cols without background*/
static int xres=-1,yres=-1;		/*xres+yres (same as self->...)*/
static int dimx,dimy;			/*total window dimension in pixel*/
static int boxw,boxh;			/*box width, box height*/
static int async_update();		/*PROTO*/
static pid_t async_updater_pid=1;
static int semid=-1;
static int shmid=-1;
static int ppid;			/*parent pid*/


static void acquire_lock() 
{
  struct sembuf sembuf;
  sembuf.sem_num=0;
  sembuf.sem_op=-1;
  sembuf.sem_flg=0;
  semop(semid,&sembuf,1);		/* get mutex */
}


static void release_lock() 
{
  struct sembuf sembuf;
  sembuf.sem_num=0;
  sembuf.sem_op=1;
  sembuf.sem_flg=0;
  semop(semid,&sembuf,1);		/* free mutex */
}


static void semcleanup() 
{
  union semun arg;
  if (semid>-1) semctl(semid,0,IPC_RMID,arg);
}


static void shmcleanup() 
{
  if (shmid>-1) shmctl(shmid,IPC_RMID,NULL);
}


static void quit_updater() 
{
  int i;
  if (async_updater_pid>1) {
    i=async_updater_pid;
    async_updater_pid=1;
    kill(i,9);
    waitpid(i,&i,0);
  }
}


static void sig_updater(int sig) 
{
  kill(ppid,sig);
  exit(0);
}


static void init_signals() 
{
  unsigned int ignsig=(1<<SIGBUS)|(1<<SIGFPE)|(1<<SIGSEGV)|
    (1<<SIGTSTP)|(1<<SIGCHLD)|(1<<SIGCONT)|
    (1<<SIGTTIN)|(1<<SIGWINCH);
  int i;
  for(i=0;i<NSIG;i++)
    if (((1<<i)&ignsig)==0)
      signal(i,sig_updater);
  
}


static int init_shm(int nbytes,unsigned char **buf) 
{
  shmid=shmget(IPC_PRIVATE,nbytes,SHM_R|SHM_W);
  if (shmid==-1) {
    error ("X11: shmget() failed: %s", strerror(errno));
    return -1;
  }
  *buf=shmat(shmid,NULL,0);
  if (*buf==NULL) {
    error ("X11: shmat() failed: %s", strerror(errno));
    return -1;
  }
  return 0;
}


/* acording to SUN-Solaris man-pages: */
#define SEM_ALTER 0200

static int init_thread(int bufsiz) 
{
  union semun semun;
  
  semid=semget(IPC_PRIVATE,1,SEM_ALTER);
  if (semid==-1) {
    error ("X11: semget() failed: %s", strerror(errno));
    return -1;
  }
  semun.val=1;
  semctl(semid,0,SETVAL,semun);
  
  ppid=getpid();
  switch(async_updater_pid=fork()) {
  case -1:
    error ("X11: fork() failed: %s", strerror(errno));
    return -1;
  case 0:
    async_update();
    error ("X11: async_update failed");
    kill(ppid,SIGTERM);
    exit(-1);
  default:
    break;
  }
  signal(SIGCHLD,quit_updater);
  atexit(quit_updater);
  return 0;
}


static int init_x(int rows,int cols,int xres,int yres) 
{
  XSetWindowAttributes wa;
  XSizeHints size_hints;
  XColor co_dummy;
  XEvent ev;

  if ((dp=XOpenDisplay(NULL))==NULL) {
    error ("X11: can't open display");
    return -1;
  }
  sc=DefaultScreen(dp);
  gc=DefaultGC(dp,sc);
  vi=DefaultVisual(dp,sc);
  dd=DefaultDepth(dp,sc);
  rw=DefaultRootWindow(dp);
  cm=DefaultColormap(dp,sc);

  if (XAllocNamedColor(dp,cm,rgbfg,&co[0],&co_dummy)==False) {
    error ("X11: can't alloc foreground color '%s'",
	   rgbfg);
    return -1;
  }
  if (XAllocNamedColor(dp,cm,rgbbg,&co[1],&co_dummy)==False) {
    error ("X11: can't alloc background color '%s'",
	   rgbbg);
    return -1;
  }
  if (XAllocNamedColor(dp,cm,rgbhg,&co[2],&co_dummy)==False) {
    error ("X11: can't alloc halfground color '%s'",
	   rgbhg);
    return -1;
  }
  boxw=xres*pixel+(xres-1)*pgap+cgap;
  boxh=yres*pixel+(yres-1)*pgap+rgap;
  dimx=cols*xres*pixel+(cols*xres-1)*pgap+(cols-1)*cgap;
  dimy=rows*yres*pixel+(rows*yres-1)*pgap+(rows-1)*rgap;
  wa.event_mask=ExposureMask;
  w=XCreateWindow(dp,rw,0,0,dimx+2*border,dimy+2*border,0,0,
		  InputOutput,vi,CWEventMask,&wa);
  pmback=XCreatePixmap(dp,w,dimx,dimy,dd);
  size_hints.min_width=size_hints.max_width=dimx+2*border;
  size_hints.min_height=size_hints.max_height=dimy+2*border;
  size_hints.flags=PPosition|PSize|PMinSize|PMaxSize;
  XSetWMProperties(dp,w,NULL,NULL,NULL,0,&size_hints,NULL,NULL);
  XSetForeground(dp,gc,co[0].pixel);
  XSetBackground(dp,gc,co[1].pixel);
  gcb=XCreateGC(dp,w,0,NULL);
  XSetForeground(dp,gcb,co[1].pixel);
  XSetBackground(dp,gcb,co[0].pixel);
  gch=XCreateGC(dp,w,0,NULL);
  XSetForeground(dp,gch,co[2].pixel);
  XSetBackground(dp,gch,co[0].pixel);
  XFillRectangle(dp,pmback,gcb,0,0,dimx,dimy);
  XSetWindowBackground(dp,w,co[1].pixel);
  XClearWindow(dp,w);
  XStoreName(dp,w,"XLCD4Linux");
  XMapWindow(dp,w);
  XFlush(dp);
  for(;;) {
    XNextEvent(dp,&ev);
    if (ev.type==Expose && ev.xexpose.count==0)
      break;
  }
  return 0;
}


int xlcdinit(LCD *Self) 
{
  char *s;

  if (sscanf(s=cfg_get("size","20x4"),"%dx%d",&cols,&rows)!=2
      || rows<1 || cols<1) {
    error ("X11: bad size '%s'",s);
    return -1;
  }
  if (sscanf(s=cfg_get("font","5x8"),"%dx%d",&xres,&yres)!=2
      || xres<5 || yres>10) {
    error ("X11: bad font '%s'",s);
    return -1;
  }
  if (sscanf(s=cfg_get("pixel","4+1"),"%d+%d",&pixel,&pgap)!=2
      || pixel<1 || pgap<0) {
    error ("X11: bad pixel '%s'",s);
    return -1;
  }
  if (sscanf(s=cfg_get("gap","-1x-1"),"%dx%d",&cgap,&rgap)!=2
      || cgap<-1 || rgap<-1) {
    error ("X11: bad gap '%s'",s);
    return -1;
  }
  if (rgap<0) rgap=pixel+pgap;
  if (cgap<0) cgap=pixel+pgap;
  border=atoi(cfg_get("border","0"));
  rgbfg=cfg_get("foreground","#000000");
  rgbbg=cfg_get("background","#80d000");
  rgbhg=cfg_get("halfground","#70c000");
  if (*rgbfg=='\\') rgbfg++;
  if (*rgbbg=='\\') rgbbg++;
  if (*rgbhg=='\\') rgbhg++;

  if (pix_init(rows,cols,xres,yres)==-1) return -1;
  if (init_x(rows,cols,xres,yres)==-1) return -1;
  init_signals();
  if (init_shm(rows*cols*xres*yres,&LCDpixmap2)==-1) return -1;
  memset(LCDpixmap2,0xff,rows*yres*cols*xres);
  if (init_thread(rows*cols*xres*yres)==-1) return -1;
  Self->rows=rows;
  Self->cols=cols;
  Self->xres=xres;
  Self->yres=yres;
  Lcd=*Self;

  pix_clear();
  return 0;
}


int xlcdclear() 
{
  return pix_clear();
}


int xlcdput(int row,int col,char *text) 
{
  return pix_put(row,col,text);
}


int xlcdbar(int type, int row, int col, int max, int len1, int len2) 
{
  return pix_bar(type,row,col,max,len1,len2);
}


int xlcdflush() {
  int dirty;
  int row,col;
  
  acquire_lock();
  dirty=0;
  for(row=0;row<rows*yres;row++) {
    int y=border+(row/yres)*rgap+row*(pixel+pgap);
    for(col=0;col<cols*xres;col++) {
      int x=border+(col/xres)*cgap+col*(pixel+pgap);
      int p=row*cols*xres+col;
      if (LCDpixmap[p]^LCDpixmap2[p]) {
	XFillRectangle(dp,w,LCDpixmap[p]?gc:gch,x,y,pixel,pixel);
	LCDpixmap2[p]=LCDpixmap[p];
	dirty=1;
      }
    }
  }
  if (dirty) XSync(dp,False);
  release_lock();
  return 0;
}


int xlcdquit(void) 
{
  semcleanup();
  shmcleanup();
  quit_updater();
  return 0;
}


/*
 * this one should only be called from the updater-thread
 * no user serviceable parts inside
 */

static void update(int x,int y,int width,int height)
{
  /*
   * theory of operation:
   * instead of the old, fully-featured but complicated update
   * region calculation, we do an update of the whole display,
   * but check before every pixel if the pixel region is inside
   * the update region.
   */

  int x0, y0;
  int x1, y1;
  int row, col;
  int dirty;
  
  x0=x-pixel;
  y0=y-pixel;
  x1=x+pixel+width;
  y1=y+pixel+height;
  
  dirty=0;
  for(row=0;row<rows*yres;row++) {
    int y=border+(row/yres)*rgap+row*(pixel+pgap);
    if (y<y0 || y>y1) continue;
    for(col=0;col<cols*xres;col++) {
      int x=border+(col/xres)*cgap+col*(pixel+pgap);
      if (x<x0 || x>x1) continue;
      int p=row*cols*xres+col;
      XFillRectangle(dp,w,LCDpixmap2[p]?gc:gch,x,y,pixel,pixel);
      dirty=1;
    }
  }
  if (dirty) XSync(dp,False);
}


static int async_update() 
{
  XSetWindowAttributes wa;
  XEvent ev;

  if ((dp=XOpenDisplay(NULL))==NULL)
    return -1;
  wa.event_mask=ExposureMask;
  XChangeWindowAttributes(dp,w,CWEventMask,&wa);
  for(;;) {
    XWindowEvent(dp,w,ExposureMask,&ev);
    if (ev.type==Expose) {
      acquire_lock();
      update(ev.xexpose.x,ev.xexpose.y,
	     ev.xexpose.width,ev.xexpose.height);
      release_lock();
    }
  }
}


LCD XWindow[] = {
  { name: "X11",
    rows:  0,
    cols:  0,
    xres:  0,
    yres:  0,
    bars:  BAR_L | BAR_R | BAR_U | BAR_D | BAR_H2 | BAR_V2 | BAR_T,
    gpos:  0,
    init:  xlcdinit,
    clear: xlcdclear,
    put:   xlcdput,
    bar:   xlcdbar,
    gpo:   NULL,
    flush: xlcdflush,
    quit:  xlcdquit 
  },
  { NULL }
};