aboutsummaryrefslogtreecommitdiffstats
path: root/drv_generic_text.c
blob: 146e601d49a1cd14212ea2bfc1362d72b5b62016 (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
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
/* $Id: drv_generic_text.c,v 1.34 2006/02/27 08:12:34 reinelt Exp $
 *
 * generic driver helper for text-based displays
 *
 * Copyright (C) 1999, 2000 Michael Reinelt <reinelt@eunet.at>
 * Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
 *
 * This file is part of LCD4Linux.
 *
 * LCD4Linux 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.
 *
 * LCD4Linux 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: drv_generic_text.c,v $
 * Revision 1.34  2006/02/27 08:12:34  reinelt
 * use serdisplib's full color support
 *
 * Revision 1.33  2006/02/27 06:15:55  reinelt
 * indent...
 *
 * Revision 1.32  2006/02/25 13:36:33  geronet
 * updated indent.sh, applied coding style
 *
 * Revision 1.31  2006/01/30 05:47:38  reinelt
 * graphic subsystem changed to full-color RGBA
 *
 * Revision 1.30  2006/01/03 06:13:46  reinelt
 * GPIO's for MatrixOrbital
 *
 * Revision 1.29  2005/11/06 09:54:43  reinelt
 * fixed icon size removed, uses XRES & YRES (I hope this doesn't lead to problemes...)
 *
 * Revision 1.28  2005/08/22 05:44:43  reinelt
 * new driver 'WincorNixdorf'
 * some fixes to the bar code
 *
 * Revision 1.27  2005/05/08 04:32:44  reinelt
 * CodingStyle added and applied
 *
 * Revision 1.26  2005/05/06 06:37:34  reinelt
 * hollow bar patch from geronet
 *
 * Revision 1.25  2005/02/24 07:06:48  reinelt
 * SimpleLCD driver added
 *
 * Revision 1.24  2005/01/18 06:30:23  reinelt
 * added (C) to all copyright statements
 *
 * Revision 1.23  2005/01/09 10:53:24  reinelt
 * small type in plugin_uname fixed
 * new homepage lcd4linux.bulix.org
 *
 * Revision 1.22  2004/11/28 15:50:24  reinelt
 * Cwlinux fixes (invalidation of user-defined chars)
 *
 * Revision 1.21  2004/06/26 12:04:59  reinelt
 *
 * uh-oh... the last CVS log message messed up things a lot...
 *
 * Revision 1.20  2004/06/26 09:27:21  reinelt
 *
 * added '-W' to CFLAGS
 * changed all C++ comments to C ones
 * cleaned up a lot of signed/unsigned mistakes
 *
 * Revision 1.19  2004/06/26 06:12:15  reinelt
 *
 * support for Beckmann+Egle Compact Terminals
 * some mostly cosmetic changes in the MatrixOrbital and USBLCD driver
 * added debugging to the generic serial driver
 * fixed a bug in the generic text driver where icons could be drawn outside
 * the display bounds
 *
 * Revision 1.18  2004/06/20 10:09:55  reinelt
 *
 * 'const'ified the whole source
 *
 * Revision 1.17  2004/06/05 06:41:40  reinelt
 *
 * chancged splash screen again
 *
 * Revision 1.16  2004/06/02 10:09:22  reinelt
 *
 * splash screen for HD44780
 *
 * Revision 1.15  2004/06/01 06:45:30  reinelt
 *
 * some Fixme's processed
 * documented some code
 *
 * Revision 1.14  2004/05/26 11:37:36  reinelt
 *
 * Curses driver ported.
 *
 * Revision 1.13  2004/03/19 09:17:46  reinelt
 *
 * removed the extra 'goto' function, row and col are additional parameters
 * of the write() function now.
 *
 * Revision 1.12  2004/03/03 03:47:04  reinelt
 * big patch from Martin Hejl:
 * - use qprintf() where appropriate
 * - save CPU cycles on gettimeofday()
 * - add quit() functions to free allocated memory
 * - fixed lots of memory leaks
 *
 * Revision 1.11  2004/02/15 21:43:43  reinelt
 * T6963 driver nearly finished
 * framework for graphic displays done
 * i2c_sensors patch from Xavier
 * some more old generation files removed
 *
 * Revision 1.10  2004/02/14 11:56:17  reinelt
 * M50530 driver ported
 * changed lots of 'char' to 'unsigned char'
 *
 * Revision 1.9  2004/02/07 13:45:23  reinelt
 * icon visibility patch #2 from Xavier
 *
 * Revision 1.8  2004/01/30 20:57:56  reinelt
 * HD44780 patch from Martin Hejl
 * dmalloc integrated
 *
 * Revision 1.7  2004/01/29 04:40:02  reinelt
 * every .c file includes "config.h" now
 *
 * Revision 1.6  2004/01/23 07:04:23  reinelt
 * icons finished!
 *
 * Revision 1.5  2004/01/23 04:53:54  reinelt
 * icon widget added (not finished yet!)
 *
 * Revision 1.4  2004/01/22 07:57:45  reinelt
 * several bugs fixed where segfaulting on layout>display
 * Crystalfontz driver optimized, 632 display already works
 *
 * Revision 1.3  2004/01/20 14:25:12  reinelt
 * some reorganization
 * moved drv_generic to drv_generic_serial
 * moved port locking stuff to drv_generic_serial
 *
 * Revision 1.2  2004/01/20 12:45:47  reinelt
 * "Default screen" working with MatrixOrbital
 *
 * Revision 1.1  2004/01/20 05:36:59  reinelt
 * moved text-display-specific stuff to drv_generic_text
 * moved all the bar stuff from drv_generic_bar to generic_text
 *
 */

/* 
 *
 * exported variables:
 *
 * extern int DROWS, DCOLS;    display size
 * extern int XRES,  YRES;     pixel width/height of one char
 * extern int CHARS, CHAR0;    number of user-defineable characters, ASCII of first char
 * extern int ICONS;           number of user-defineable characters reserved for icons
 * extern int GOTO_COST;       number of bytes a goto command requires
 * extern int INVALIDATE;      re-send a modified userdefined char?
 *
 *
 * these functions must be implemented by the real driver:
 *
 * void (*drv_generic_text_real_write)(int row, int col, unsigned char *data, int len);
 *  writes a text of specified length at position (row, col)
 *
 * void (*drv_generic_text_real_defchar)(int ascii, unsigned char *buffer);
 *  defines the bitmap of a user-defined character
 *
 *
 * exported fuctions:
 *
 * int drv_generic_text_init (char *section, char *driver);
 *   initializes the generic text driver
 *
 * int drv_generic_text_draw (WIDGET *W);
 *   renders Text widget into framebuffer
 *   calls drv_generic_text_real_write()
 *
 * int drv_generic_text_icon_init (void);
 *   initializes the generic icon driver
 *   
 * int drv_generic_text_icon_draw (WIDGET *W);
 *   renders Icon widget into framebuffer
 *   calls drv_generic_text_real_write() and drv_generic_text_real_defchar()
 *
 * int drv_generic_text_bar_init (int single_segments);
 *   initializes the generic icon driver
 *
 * void drv_generic_text_bar_add_segment (int val1, int val2, DIRECTION dir, int ascii);
 *   adds a 'fixed' character to the bar-renderer
 *
 * int drv_generic_text_bar_draw (WIDGET *W);
 *   renders Bar widget into framebuffer
 *   calls drv_generic_text_real_write() and drv_generic_text_real_defchar()
 *
 * int drv_generic_text_quit (void);
 *   closes the generic text driver
 *
 */

#include "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <termios.h>
#include <fcntl.h>

#include "debug.h"
#include "cfg.h"
#include "plugin.h"
#include "widget.h"
#include "widget_text.h"
#include "widget_icon.h"
#include "widget_bar.h"
#include "drv.h"
#include "drv_generic_text.h"

#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif


typedef struct {
    int val1;
    int val2;
    DIRECTION dir;
    STYLE style;
    int segment;
    int invalid;
} BAR;

typedef struct {
    int val1;
    int val2;
    DIRECTION dir;
    STYLE style;
    int used;
    int ascii;
} SEGMENT;

static char *Section = NULL;
static char *Driver = NULL;


int DROWS = 20;			/* display size: rows */
int DCOLS = 4;			/* display size: columns */
int XRES = 6;			/* pixels of one char cell */
int YRES = 8;			/* pixels of one char cell */
int CHARS = 0;			/* number of user-defineable characters */
int CHAR0 = 0;			/* ASCII of first user-defineable char */
int ICONS = 0;			/* number of user-defineable characters reserved for icons */

int GOTO_COST = 0;		/* number of bytes a goto command requires */
int INVALIDATE = 0;		/* re-send a modified userdefined char? */


void (*drv_generic_text_real_write) () = NULL;
void (*drv_generic_text_real_defchar) () = NULL;


static int LROWS = 20;		/* layout size: rows */
static int LCOLS = 4;		/* layout size: columns */

static char *LayoutFB = NULL;
static char *DisplayFB = NULL;

static int Single_Segments = 0;

static int nSegment = 0;
static int fSegment = 0;
static SEGMENT Segment[128];
static BAR *BarFB = NULL;



/****************************************/
/*** generic Framebuffer stuff        ***/
/****************************************/

static void drv_generic_text_resizeFB(int rows, int cols)
{
    char *newFB;
    BAR *newBar;
    int i, row, col;

    /* Layout FB is large enough */
    if (rows <= LROWS && cols <= LCOLS)
	return;

    /* get maximum values */
    if (rows < LROWS)
	rows = LROWS;
    if (cols < LCOLS)
	cols = LCOLS;

    /* allocate new Layout FB */
    newFB = malloc(cols * rows * sizeof(char));
    memset(newFB, ' ', rows * cols * sizeof(char));

    /* transfer contents */
    if (LayoutFB != NULL) {
	for (row = 0; row < LROWS; row++) {
	    for (col = 0; col < LCOLS; col++) {
		newFB[row * cols + col] = LayoutFB[row * LCOLS + col];
	    }
	}
	free(LayoutFB);
    }
    LayoutFB = newFB;


    /* resize Bar buffer */
    if (BarFB) {

	newBar = malloc(rows * cols * sizeof(BAR));

	for (i = 0; i < rows * cols; i++) {
	    newBar[i].val1 = -1;
	    newBar[i].val2 = -1;
	    newBar[i].dir = 0;
	    newBar[i].segment = -1;
	    newBar[i].invalid = 0;
	}

	/* transfer contents */
	for (row = 0; row < LROWS; row++) {
	    for (col = 0; col < LCOLS; col++) {
		newBar[row * cols + col] = BarFB[row * LCOLS + col];
	    }
	}

	free(BarFB);
	BarFB = newBar;
    }

    LCOLS = cols;
    LROWS = rows;
}


/****************************************/
/*** generic text handling            ***/
/****************************************/

int drv_generic_text_init(const char *section, const char *driver)
{

    Section = (char *) section;
    Driver = (char *) driver;

    /* init display framebuffer */
    DisplayFB = (char *) malloc(DCOLS * DROWS * sizeof(char));
    memset(DisplayFB, ' ', DROWS * DCOLS * sizeof(char));

    /* init layout framebuffer */
    LROWS = 0;
    LCOLS = 0;
    LayoutFB = NULL;
    drv_generic_text_resizeFB(DROWS, DCOLS);

    /* sanity check */
    if (LayoutFB == NULL || DisplayFB == NULL) {
	error("%s: framebuffer could not be allocated: malloc() failed", Driver);
	return -1;
    }

    return 0;
}


/* say hello to the user */
int drv_generic_text_greet(const char *msg1, const char *msg2)
{
    int i;
    int flag = 0;

    char *line1[] = { "* LCD4Linux " VERSION " *",
	"LCD4Linux " VERSION,
	"* LCD4Linux *",
	"LCD4Linux",
	"L4Linux",
	NULL
    };

    char *line2[] = { "http://lcd4linux.bulix.org",
	"lcd4linux.bulix.org",
	NULL
    };


    for (i = 0; line1[i]; i++) {
	if (strlen(line1[i]) <= (unsigned) DCOLS) {
	    if (drv_generic_text_real_write)
		drv_generic_text_real_write(0, (DCOLS - strlen(line1[i])) / 2, line1[i], strlen(line1[i]));
	    flag = 1;
	    break;
	}
    }

    if (DROWS >= 2) {
	for (i = 0; line2[i]; i++) {
	    if (strlen(line2[i]) <= (unsigned) DCOLS) {
		if (drv_generic_text_real_write)
		    drv_generic_text_real_write(1, (DCOLS - strlen(line2[i])) / 2, line2[i], strlen(line2[i]));
		flag = 1;
		break;
	    }
	}
    }

    if (msg1 && DROWS >= 3) {
	int len = strlen(msg1);
	if (len <= DCOLS) {
	    if (drv_generic_text_real_write)
		drv_generic_text_real_write(2, (DCOLS - len) / 2, msg1, len);
	    flag = 1;
	}
    }

    if (msg2 && DROWS >= 4) {
	int len = strlen(msg2);
	if (len <= DCOLS) {
	    if (drv_generic_text_real_write)
		drv_generic_text_real_write(3, (DCOLS - len) / 2, msg2, len);
	    flag = 1;
	}
    }

    return flag;
}


int drv_generic_text_draw(WIDGET * W)
{
    WIDGET_TEXT *Text = W->data;
    char *txt, *fb1, *fb2;
    int row, col, col0, len, end;

    row = W->row;
    col = W->col;
    txt = Text->buffer;
    len = strlen(txt);
    end = col + len;

    /* maybe grow layout framebuffer */
    drv_generic_text_resizeFB(row + 1, col + len);

    fb1 = LayoutFB + row * LCOLS;
    fb2 = DisplayFB + row * DCOLS;

    /* transfer new text into layout buffer */
    memcpy(fb1 + col, txt, len);

    if (row < DROWS) {
	for (; col <= end && col < DCOLS; col++) {
	    int pos1, pos2, equal;
	    if (fb1[col] == fb2[col])
		continue;
	    col0 = col;
	    for (pos1 = col, pos2 = pos1, col++, equal = 0; col <= end && col < DCOLS; col++) {
		if (fb1[col] == fb2[col]) {
		    /* If we find just one equal byte, we don't break, because this  */
		    /* would require a goto, which takes several bytes, too. */
		    if (GOTO_COST >= 0 && ++equal > GOTO_COST)
			break;
		} else {
		    pos2 = col;
		    equal = 0;
		}
	    }
	    memcpy(fb2 + pos1, fb1 + pos1, pos2 - pos1 + 1);
	    if (drv_generic_text_real_write)
		drv_generic_text_real_write(row, col0, fb2 + pos1, pos2 - pos1 + 1);
	}
    }

    return 0;
}


int drv_generic_text_quit(void)
{

    if (LayoutFB) {
	free(LayoutFB);
	LayoutFB = NULL;
    }

    if (DisplayFB) {
	free(DisplayFB);
	DisplayFB = NULL;
    }

    if (BarFB) {
	free(BarFB);
	BarFB = NULL;
    }
    widget_unregister();

    return (0);
}


/****************************************/
/*** generic icon handling            ***/
/****************************************/

int drv_generic_text_icon_init(void)
{
    if (cfg_number(Section, "Icons", 0, 0, CHARS, &ICONS) < 0)
	return -1;
    if (ICONS > 0) {
	info("%s: reserving %d of %d user-defined characters for icons", Driver, ICONS, CHARS);
    }
    return 0;
}


int drv_generic_text_icon_draw(WIDGET * W)
{
    static int icon_counter = 0;
    WIDGET_ICON *Icon = W->data;
    int row, col;
    int l_idx, d_idx;
    int invalidate = 0;
    unsigned char ascii;

    row = W->row;
    col = W->col;

    /* maybe grow layout framebuffer */
    drv_generic_text_resizeFB(row + 1, col + 1);

    /* icon deactivated? */
    if (Icon->ascii == -2)
	return 0;

    /* ASCII already assigned? */
    if (Icon->ascii == -1) {
	if (icon_counter >= ICONS) {
	    error("cannot process icon '%s': out of icons", W->name);
	    Icon->ascii = -2;
	    return -1;
	}
	icon_counter++;
	Icon->ascii = CHAR0 + CHARS - icon_counter;
    }

    /* maybe redefine icon */
    if (Icon->curmap != Icon->prvmap && Icon->visible) {
	Icon->prvmap = Icon->curmap;
	if (drv_generic_text_real_defchar)
	    drv_generic_text_real_defchar(Icon->ascii, Icon->bitmap + YRES * Icon->curmap);
	invalidate = INVALIDATE;
    }

    /* use blank if invisible */
    ascii = Icon->visible ? Icon->ascii : ' ';

    /* index into the two framebuffers */
    l_idx = row * LCOLS + col;
    d_idx = row * DCOLS + col;

    /* transfer icon into layout buffer */
    LayoutFB[l_idx] = ascii;

    /* maybe send icon to the display */
    if (row < DROWS && col < DCOLS && (DisplayFB[d_idx] != ascii || invalidate)) {
	DisplayFB[d_idx] = ascii;
	if (drv_generic_text_real_write)
	    drv_generic_text_real_write(row, col, DisplayFB + d_idx, 1);
    }

    return 0;

}


/****************************************/
/*** generic bar handling             ***/
/****************************************/

static void drv_generic_text_bar_clear(void)
{
    int i;

    for (i = 0; i < LROWS * LCOLS; i++) {
	BarFB[i].val1 = -1;
	BarFB[i].val2 = -1;
	BarFB[i].dir = 0;
	BarFB[i].style = 0;
	BarFB[i].segment = -1;
	BarFB[i].invalid = 0;
    }

    for (i = 0; i < nSegment; i++) {
	Segment[i].used = 0;
    }
}


int drv_generic_text_bar_init(const int single_segments)
{
    if (BarFB)
	free(BarFB);

    if ((BarFB = malloc(LROWS * LCOLS * sizeof(BAR))) == NULL) {
	error("bar buffer allocation failed: out of memory");
	return -1;
    }

    Single_Segments = single_segments;

    nSegment = 0;
    fSegment = 0;

    drv_generic_text_bar_clear();

    return 0;
}


void drv_generic_text_bar_add_segment(const int val1, const int val2, const DIRECTION dir, const int ascii)
{
    Segment[fSegment].val1 = val1;
    Segment[fSegment].val2 = val2;
    Segment[fSegment].dir = dir;
    if (val1 == 0 && val2 == 0)
	Segment[fSegment].style = 0;
    else
	Segment[fSegment].style = 255;
    Segment[fSegment].used = 0;
    Segment[fSegment].ascii = ascii;

    fSegment++;
    nSegment = fSegment;
}


static void drv_generic_text_bar_create_bar(int row, int col, const DIRECTION dir, STYLE style, int len, int val1,
					    int val2)
{
    int rev = 0, max;
    if (style)
	BarFB[row * LCOLS + col].style = STYLE_FIRST;

    switch (dir) {
    case DIR_WEST:
	max = len * XRES;
	val1 = max - val1;
	val2 = max - val2;
	rev = 1;

    case DIR_EAST:
	while (len > 0 && col < LCOLS) {
	    BarFB[row * LCOLS + col].dir = dir;
	    BarFB[row * LCOLS + col].segment = -1;
	    if (style && BarFB[row * LCOLS + col].style == 0)
		BarFB[row * LCOLS + col].style = style;
	    if (val1 >= XRES) {
		BarFB[row * LCOLS + col].val1 = rev ? 0 : XRES;
		val1 -= XRES;
	    } else {
		BarFB[row * LCOLS + col].val1 = rev ? XRES - val1 : val1;
		val1 = 0;
	    }
	    if (val2 >= XRES) {
		BarFB[row * LCOLS + col].val2 = rev ? 0 : XRES;
		val2 -= XRES;
	    } else {
		BarFB[row * LCOLS + col].val2 = rev ? XRES - val2 : val2;
		val2 = 0;
	    }
	    len--;
	    col++;
	}
	if (style)
	    BarFB[row * LCOLS + col - 1].style = STYLE_LAST;
	break;

    case DIR_SOUTH:
	max = len * YRES;
	val1 = max - val1;
	val2 = max - val2;
	rev = 1;

    case DIR_NORTH:
	while (len > 0 && row < LROWS) {
	    BarFB[row * LCOLS + col].dir = dir;
	    BarFB[row * LCOLS + col].segment = -1;
	    if (val1 >= YRES) {
		BarFB[row * LCOLS + col].val1 = rev ? 0 : YRES;
		val1 -= YRES;
	    } else {
		BarFB[row * LCOLS + col].val1 = rev ? YRES - val1 : val1;
		val1 = 0;
	    }
	    if (val2 >= YRES) {
		BarFB[row * LCOLS + col].val2 = rev ? 0 : YRES;
		val2 -= YRES;
	    } else {
		BarFB[row * LCOLS + col].val2 = rev ? YRES - val2 : val2;
		val2 = 0;
	    }
	    len--;
	    row++;
	}
	break;
    }
}


static void drv_generic_text_bar_create_segments(void)
{
    int i, j, n;
    int res, l1, l2;

    /* find first unused segment */
    for (i = fSegment; i < nSegment && Segment[i].used; i++);

    /* pack unused segments */
    for (j = i + 1; j < nSegment; j++) {
	if (Segment[j].used)
	    Segment[i++] = Segment[j];
    }
    nSegment = i;

    /* create needed segments */
    for (n = 0; n < LROWS * LCOLS; n++) {
	if (BarFB[n].dir == 0)
	    continue;
	res = BarFB[n].dir & (DIR_EAST | DIR_WEST) ? XRES : YRES;
	for (i = 0; i < nSegment; i++) {
	    l1 = Segment[i].val1;
	    if (l1 > res)
		l1 = res;
	    l2 = Segment[i].val2;
	    if (l2 > res)
		l2 = res;

	    /* same value */
	    if (l1 == BarFB[n].val1 && l2 == BarFB[n].val2) {
		/* empty block, only style is interesting */
		if (l1 == 0 && l2 == 0 && Segment[i].style == BarFB[n].style)
		    break;
		/* full block, style doesn't matter */
		if (l1 == res && l2 == res)
		    break;
		/* half upper block */
		if (l1 == res && l2 == 0 && Segment[i].style == BarFB[n].style)
		    break;
		/* half lower block */
		if (l1 == 0 && l2 == res && Segment[i].style == BarFB[n].style)
		    break;
		/* same style, same direction */
		if (Segment[i].style == BarFB[n].style && Segment[i].dir & BarFB[n].dir)
		    break;
#if 0
		/* hollow style, val(1,2) == 1, like '[' */
		if (l1 == 1 && l2 == 1 && Segment[i].style == STYLE_FIRST && BarFB[n].style == STYLE_HOLLOW)
		    break;
		/* hollow style, val(1,2) == 1, like ']' */
		if (l1 == 1 && l2 == 1 && Segment[i].style == STYLE_LAST && BarFB[n].style == STYLE_HOLLOW)
		    break;
#endif
	    }
	}
	if (i == nSegment) {
	    nSegment++;
	    Segment[i].val1 = BarFB[n].val1;
	    Segment[i].val2 = BarFB[n].val2;
	    Segment[i].dir = BarFB[n].dir;
	    Segment[i].style = BarFB[n].style;
	    Segment[i].used = 0;
	    Segment[i].ascii = -1;
	}
	BarFB[n].segment = i;
    }
}


static int drv_generic_text_bar_segment_error(const int i, const int j)
{
    int res;
    int i1, i2, j1, j2;

    if (i == j)
	return 65535;
    if (!(Segment[i].dir & Segment[j].dir))
	return 65535;
    if (Segment[i].style != Segment[j].style)
	return 65535;

    res = Segment[i].dir & (DIR_EAST | DIR_WEST) ? XRES : YRES;

    i1 = Segment[i].val1;
    if (i1 > res)
	i1 = res;
    i2 = Segment[i].val2;
    if (i2 > res)
	i2 = res;
    j1 = Segment[j].val1;
    if (j1 > res)
	j1 = res;
    j2 = Segment[j].val2;
    if (j2 > res)
	j2 = res;

    /* do not replace empty with non-empty */
    if (i1 == 0 && j1 != 0)
	return 65535;
    if (i2 == 0 && j2 != 0)
	return 65535;

    /* do not replace full with non-full */
    if (i1 == res && j1 < res)
	return 65535;
    if (i2 == res && j2 < res)
	return 65535;

    /* do not replace start line */
    /* but only if there are at least some chars available */
    if (CHARS - ICONS > 0) {
	if (i1 == 1 && j1 != 1 && i2 > 0)
	    return 65535;
	if (i2 == 1 && j2 != 1 && j1 > 0)
	    return 65535;
    }

    /* do not replace equal length with non-equal length */
    if (i1 == i2 && j1 != j2)
	return 65535;

    return (i1 - j1) * (i1 - j1) + (i2 - j2) * (i2 - j2);
}


static void drv_generic_text_bar_pack_segments(void)
{
    int i, j, n, min;
    int pack_i, pack_j;
    int pass1 = 1;
    int error[nSegment][nSegment];

    if (nSegment <= fSegment + CHARS - ICONS) {
	return;
    }

    for (i = 0; i < nSegment; i++) {
	for (j = 0; j < nSegment; j++) {
	    error[i][j] = drv_generic_text_bar_segment_error(i, j);
	    // debug ("[%d][%d] = %d", i, j, error[i][j]);
	}
    }

    while (nSegment > fSegment + CHARS - ICONS) {

	min = 65535;
	pack_i = -1;
	pack_j = -1;
	for (i = fSegment; i < nSegment; i++) {
	    if (pass1 && Segment[i].used)
		continue;
	    for (j = 0; j < nSegment; j++) {
		if (error[i][j] < min) {
		    min = error[i][j];
		    pack_i = i;
		    pack_j = j;
		}
	    }
	}
	if (pack_i == -1) {
	    if (pass1) {
		pass1 = 0;
		continue;
	    } else {
		error("unable to compact bar characters");
		error("nSegment=%d fSegment=%d CHARS=%d ICONS=%d", nSegment, fSegment, CHARS, ICONS);
		error("Segment[0].val1=%d val2=%d", Segment[0].val1, Segment[0].val2);
		error("Segment[1].val1=%d val2=%d", Segment[1].val1, Segment[1].val2);
		error("Segment[2].val1=%d val2=%d", Segment[2].val1, Segment[2].val2);
		nSegment = CHARS - ICONS;
		break;
	    }
	}
#if 0
	debug("pack_segment: n=%d i=%d j=%d min=%d", nSegment, pack_i, pack_j, min);
	debug("Pack_segment: i1=%d i2=%d j1=%d j2=%d\n", Segment[pack_i].val1, Segment[pack_i].val2,
	      Segment[pack_j].val1, Segment[pack_j].val2);
#endif

	nSegment--;
	Segment[pack_i] = Segment[nSegment];

	for (i = 0; i < nSegment; i++) {
	    error[pack_i][i] = error[nSegment][i];
	    error[i][pack_i] = error[i][nSegment];
	}

	for (n = 0; n < LROWS * LCOLS; n++) {
	    if (BarFB[n].segment == pack_i)
		BarFB[n].segment = pack_j;
	    if (BarFB[n].segment == nSegment)
		BarFB[n].segment = pack_i;
	}
    }
}


static void drv_generic_text_bar_define_chars(void)
{
    int c, i, j;
    unsigned char buffer[8];

    for (i = fSegment; i < nSegment; i++) {
	if (Segment[i].used)
	    continue;
	if (Segment[i].ascii != -1)
	    continue;
	for (c = 0; c < CHARS - ICONS; c++) {
	    for (j = fSegment; j < nSegment; j++) {
		if (Segment[j].ascii == c)
		    break;
	    }
	    if (j == nSegment)
		break;
	}
	Segment[i].ascii = c;
	switch (Segment[i].dir) {
	case DIR_WEST:
	    if (Segment[i].style) {
		buffer[0] = 255;
		buffer[7] = 255;
		if (Segment[i].style & (STYLE_FIRST | STYLE_LAST))
		    for (j = 1; j < 7; j++) {
			buffer[j] |= Segment[i].style & STYLE_FIRST ? 16 : 1;
		    }
	    }
	    break;
	case DIR_EAST:
	    for (j = 0; j < 4; j++) {
		buffer[j] = 255 << (XRES - Segment[i].val1);
		buffer[j + 4] = 255 << (XRES - Segment[i].val2);
	    }
	    if (Segment[i].style) {
		buffer[0] = 255;
		buffer[7] = 255;
		if (Segment[i].style & (STYLE_FIRST | STYLE_LAST))
		    for (j = 1; j < 7; j++) {
			buffer[j] |= Segment[i].style & STYLE_FIRST ? 16 : 1;
		    }
	    }
	    break;
	case DIR_NORTH:
	    for (j = 0; j < Segment[i].val1; j++) {
		buffer[7 - j] = (1 << XRES) - 1;
	    }
	    for (; j < YRES; j++) {
		buffer[7 - j] = 0;
	    }
	    break;
	case DIR_SOUTH:
	    for (j = 0; j < Segment[i].val1; j++) {
		buffer[j] = (1 << XRES) - 1;
	    }
	    for (; j < YRES; j++) {
		buffer[j] = 0;
	    }
	    break;
	}
	if (drv_generic_text_real_defchar)
	    drv_generic_text_real_defchar(CHAR0 + c, buffer);

	/* maybe invalidate framebuffer */
	if (INVALIDATE) {
	    for (j = 0; j < LROWS * LCOLS; j++) {
		if (BarFB[j].segment == i) {
		    BarFB[j].invalid = 1;
		}
	    }
	}
    }
}


int drv_generic_text_bar_draw(WIDGET * W)
{
    WIDGET_BAR *Bar = W->data;
    int row, col, col0, len, res, max, val1, val2;
    int c, n, s;
    DIRECTION dir;
    STYLE style;

    row = W->row;
    col = W->col;
    dir = Bar->direction;
    style = Bar->style;
    len = Bar->length;

    /* maybe grow layout framebuffer */
    /* bars *always* grow heading North or East! */
    if (dir & (DIR_EAST | DIR_WEST)) {
	drv_generic_text_resizeFB(row + 1, col + len);
    } else {
	drv_generic_text_resizeFB(row + 1, col + 1);
    }

    res = dir & (DIR_EAST | DIR_WEST) ? XRES : YRES;
    max = len * res;
    val1 = Bar->val1 * (double) (max);
    val2 = Bar->val2 * (double) (max);

    if (val1 < 1)
	val1 = 1;
    else if (val1 > max)
	val1 = max;

    if (val2 < 1)
	val2 = 1;
    else if (val2 > max)
	val2 = max;

    if (Single_Segments)
	val2 = val1;

    /* create this bar */
    drv_generic_text_bar_create_bar(row, col, dir, style, len, val1, val2);

    /* process all bars */
    drv_generic_text_bar_create_segments();
    drv_generic_text_bar_pack_segments();
    drv_generic_text_bar_define_chars();

    /* reset usage flags */
    for (s = 0; s < nSegment; s++) {
	Segment[s].used = 0;
    }

    /* set usage flags */
    for (n = 0; n < LROWS * LCOLS; n++) {
	if ((s = BarFB[n].segment) != -1)
	    Segment[s].used = 1;
    }

    /* transfer bars into layout buffer */
    for (row = 0; row < LROWS; row++) {
	for (col = 0; col < LCOLS; col++) {
	    n = row * LCOLS + col;
	    s = BarFB[n].segment;
	    if (s == -1)
		continue;
	    c = Segment[s].ascii;
	    if (c == -1)
		continue;
	    if (s >= fSegment)
		c += CHAR0;	/* ascii offset for user-defineable chars */
	    LayoutFB[n] = c;
	    /* maybe invalidate display framebuffer */
	    if (BarFB[n].invalid) {
		BarFB[n].invalid = 0;
		DisplayFB[row * DCOLS + col] = ~LayoutFB[n];
	    }
	}
    }

    /* transfer differences to the display */
    for (row = 0; row < DROWS; row++) {
	for (col = 0; col < DCOLS; col++) {
	    int pos1, pos2, equal;
	    if (LayoutFB[row * LCOLS + col] == DisplayFB[row * DCOLS + col])
		continue;
	    col0 = col;
	    for (pos1 = col, pos2 = pos1, col++, equal = 0; col < DCOLS; col++) {
		if (LayoutFB[row * LCOLS + col] == DisplayFB[row * DCOLS + col]) {
		    /* If we find just one equal byte, we don't break, because this  */
		    /* would require a goto, which takes several bytes, too. */
		    if (++equal > GOTO_COST)
			break;
		} else {
		    pos2 = col;
		    equal = 0;
		}
	    }
	    memcpy(DisplayFB + row * DCOLS + pos1, LayoutFB + row * LCOLS + pos1, pos2 - pos1 + 1);
	    if (drv_generic_text_real_write)
		drv_generic_text_real_write(row, col0, DisplayFB + row * DCOLS + pos1, pos2 - pos1 + 1);
	}
    }

    return 0;

}