firmware/drivers/lcd-charcell.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2007 by Jens Arnold
  11  * Based on the work of Alan Korr, Kjell Ericson and others
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version 2
  16  * of the License, or (at your option) any later version.
  17  *
  18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19  * KIND, either express or implied.
  20  *
  21  ****************************************************************************/
  22
  23 #include <stdio.h>
  24 #include "config.h"
  25 #include "hwcompat.h"
  26 #include "stdarg.h"
  27 #include "lcd.h"
  28 #include "kernel.h"
  29 #include "thread.h"
  30 #include <string.h>
  31 #include <stdlib.h>
  32 #include "debug.h"
  33 #include "file.h"
  34 #include "system.h"
  35 #include "lcd-charcell.h"
  36 #include "rbunicode.h"
  37 #include "scroll_engine.h"
  38
  39 /** definitions **/
  40
  41 #define VARIABLE_XCHARS 16 /* number of software user-definable characters */
  42 /* There must be mappings for this many characters in the 0xe000 unicode range
  43  * in lcd-charset-<target>.c */
  44
  45 #define NO_PATTERN (-1)
  46
  47 static int find_xchar(unsigned long ucs);
  48
  49 /** globals **/
  50
  51 unsigned char lcd_charbuffer[LCD_HEIGHT][LCD_WIDTH];  /* The "frame"buffer */
  52 static unsigned char lcd_substbuffer[LCD_HEIGHT][LCD_WIDTH];
  53 struct pattern_info lcd_patterns[MAX_HW_PATTERNS];
  54 struct cursor_info lcd_cursor;
  55
  56 static unsigned char xfont_variable[VARIABLE_XCHARS][HW_PATTERN_SIZE];
  57 static bool xfont_variable_locked[VARIABLE_XCHARS];
  58 static int xspace; /* stores xhcar id of ' ' - often needed */
  59
  60 static struct viewport default_vp =
  61   {
  62     .x        = 0,
  63     .y        = 0,
  64     .width    = LCD_WIDTH,
  65     .height   = LCD_HEIGHT,
  66   };
  67
  68 static struct viewport* current_vp = &default_vp;
  69
  70 /* LCD init */
  71 void lcd_init (void)
  72 {
  73     lcd_init_device();
  74     lcd_charset_init();
  75     memset(lcd_patterns, 0, sizeof(lcd_patterns));
  76     xspace = find_xchar(' ');
  77     memset(lcd_charbuffer, xchar_info[xspace].hw_char, sizeof(lcd_charbuffer));
  78     scroll_init();
  79 }
  80
  81 /* Viewports */
  82
  83 void lcd_set_viewport(struct viewport* vp)
  84 {
  85     if (vp == NULL)
  86         current_vp = &default_vp;
  87     else
  88         current_vp = vp;
  89
  90 #if defined(SIMULATOR)
  91     /* Force the viewport to be within bounds.  If this happens it should
  92      *  be considered an error - the viewport will not draw as it might be
  93      *  expected.
  94      */
  95     if((unsigned) current_vp->x > (unsigned) LCD_WIDTH
  96         || (unsigned) current_vp->y > (unsigned) LCD_HEIGHT
  97         || current_vp->x + current_vp->width > LCD_WIDTH
  98         || current_vp->y + current_vp->height > LCD_HEIGHT)
  99     {
 100 #if !defined(HAVE_VIEWPORT_CLIP)
 101         DEBUGF("ERROR: "
 102 #else
 103         DEBUGF("NOTE: "
 104 #endif
 105             "set_viewport out of bounds: x: %d y: %d width: %d height:%d\n",
 106             current_vp->x, current_vp->y,
 107             current_vp->width, current_vp->height);
 108     }
 109
 110 #endif
 111 }
 112
 113 void lcd_update_viewport(void)
 114 {
 115     lcd_update();
 116 }
 117
 118 /** parameter handling **/
 119
 120 int lcd_getwidth(void)
 121 {
 122     return current_vp->width;
 123 }
 124
 125 int lcd_getheight(void)
 126 {
 127     return current_vp->height;
 128 }
 129
 130 int lcd_getstringsize(const unsigned char *str, int *w, int *h)
 131 {
 132     int width = utf8length(str);
 133
 134     if (w)
 135         *w = width;
 136     if (h)
 137         *h = 1;
 138
 139     return width;
 140 }
 141
 142 /** low-level functions **/
 143
 144 static int find_xchar(unsigned long ucs)
 145 {
 146     int low = 0;
 147     int high = xchar_info_size - 1;
 148
 149     do
 150     {
 151         int probe = (low + high) >> 1;
 152
 153         if (xchar_info[probe].ucs < ucs)
 154             low = probe + 1;
 155         else if (xchar_info[probe].ucs > ucs)
 156             high = probe - 1;
 157         else
 158             return probe;
 159     }
 160     while (low <= high);
 161
 162     /* Not found: return index of no-char symbol (last symbol, hardcoded). */
 163     return xchar_info_size - 1;
 164 }
 165
 166 static int glyph_to_pat(unsigned glyph)
 167 {
 168     int i;
 169
 170     for (i = 0; i < lcd_pattern_count; i++)
 171         if (lcd_patterns[i].glyph == glyph)
 172             return i;
 173
 174     return NO_PATTERN;
 175 }
 176
 177 static void lcd_free_pat(int pat)
 178 {
 179     int x, y;
 180
 181     if (pat != NO_PATTERN)
 182     {
 183         for (x = 0; x < LCD_WIDTH; x++)
 184             for (y = 0; y < LCD_HEIGHT; y++)
 185                 if (pat == lcd_charbuffer[y][x])
 186                     lcd_charbuffer[y][x] = lcd_substbuffer[y][x];
 187
 188         if (lcd_cursor.enabled && pat == lcd_cursor.hw_char)
 189             lcd_cursor.hw_char = lcd_cursor.subst_char;
 190
 191         lcd_patterns[pat].count = 0;
 192     }
 193 }
 194
 195 static int lcd_get_free_pat(int xchar)
 196 {
 197     static int last_used_pat = 0;
 198
 199     int pat = last_used_pat; /* start from last used pattern */
 200     int least_pat = pat;     /* pattern with least priority */
 201     int least_priority = lcd_patterns[pat].priority;
 202     int i;
 203
 204     for (i = 0; i < lcd_pattern_count; i++)
 205     {
 206         if (++pat >= lcd_pattern_count)  /* Keep 'pat' within limits */
 207             pat = 0;
 208
 209         if (lcd_patterns[pat].count == 0)
 210         {
 211             last_used_pat = pat;
 212             return pat;
 213         }
 214         if (lcd_patterns[pat].priority < least_priority)
 215         {
 216             least_priority = lcd_patterns[pat].priority;
 217             least_pat = pat;
 218         }
 219     }
 220     if (xchar_info[xchar].priority > least_priority) /* prioritized char */
 221     {
 222         lcd_free_pat(least_pat);
 223         last_used_pat = least_pat;
 224         return least_pat;
 225     }
 226     return NO_PATTERN;
 227 }
 228
 229 static const unsigned char *glyph_to_pattern(unsigned glyph)
 230 {
 231     if (glyph & 0x8000)
 232         return xfont_variable[glyph & 0x7fff];
 233     else
 234         return xfont_fixed[glyph];
 235 }
 236
 237 static int map_xchar(int xchar, unsigned char *substitute)
 238 {
 239     int pat;
 240     unsigned glyph;
 241
 242     if (xchar_info[xchar].priority > 0)      /* soft char */
 243     {
 244         glyph = xchar_info[xchar].glyph;
 245         pat = glyph_to_pat(glyph);
 246
 247         if (pat == NO_PATTERN)               /* not yet mapped */
 248         {
 249             pat = lcd_get_free_pat(xchar);   /* try to map */
 250
 251             if (pat == NO_PATTERN)           /* failed: just use substitute */
 252                 return xchar_info[xchar].hw_char;
 253             else
 254             {                            /* define pattern */
 255                 lcd_patterns[pat].priority = xchar_info[xchar].priority;
 256                 lcd_patterns[pat].glyph = glyph;
 257                 memcpy(lcd_patterns[pat].pattern, glyph_to_pattern(glyph),
 258                        HW_PATTERN_SIZE);
 259             }
 260         }
 261         lcd_patterns[pat].count++;           /* increase reference count */
 262         *substitute = xchar_info[xchar].hw_char;
 263         return pat;
 264     }
 265     else                                     /* hardware char */
 266         return xchar_info[xchar].hw_char;
 267 }
 268
 269 static void lcd_putxchar(int x, int y, int xchar)
 270 {
 271     int lcd_char;
 272
 273     /* Adjust for viewport */
 274     x += current_vp->x;
 275     y += current_vp->y;
 276
 277 #if defined(HAVE_VIEWPORT_CLIP)
 278     if((unsigned)x > (unsigned)LCD_WIDTH || (unsigned)y > (unsigned)LCD_HEIGHT)
 279         return;
 280 #endif
 281
 282     lcd_char  = lcd_charbuffer[y][x];
 283
 284     if (lcd_char < lcd_pattern_count)        /* old char was soft */
 285         lcd_patterns[lcd_char].count--;      /* decrease old reference count */
 286
 287     lcd_charbuffer[y][x] = map_xchar(xchar, &lcd_substbuffer[y][x]);
 288 }
 289
 290 /** user-definable pattern handling **/
 291
 292 unsigned long lcd_get_locked_pattern(void)
 293 {
 294     int i = 0;
 295
 296     for (i = 0; i < VARIABLE_XCHARS; i++)
 297     {
 298         if (!xfont_variable_locked[i])
 299         {
 300             xfont_variable_locked[i] = true;
 301             return 0xe000 + i;  /* hard-coded */
 302         }
 303     }
 304     return 0;
 305 }
 306
 307 void lcd_unlock_pattern(unsigned long ucs)
 308 {
 309     int xchar = find_xchar(ucs);
 310     unsigned glyph = xchar_info[xchar].glyph;
 311
 312     if (glyph & 0x8000) /* variable extended char */
 313     {
 314         lcd_free_pat(glyph_to_pat(glyph));
 315         xfont_variable_locked[glyph & 0x7fff] = false;
 316     }
 317 }
 318
 319 void lcd_define_pattern(unsigned long ucs, const char *pattern)
 320 {
 321     int xchar = find_xchar(ucs);
 322     unsigned glyph = xchar_info[xchar].glyph;
 323     int pat;
 324
 325     if (glyph & 0x8000) /* variable extended char */
 326     {
 327         memcpy(xfont_variable[glyph & 0x7fff], pattern, HW_PATTERN_SIZE);
 328         pat = glyph_to_pat(glyph);
 329         if (pat != NO_PATTERN)
 330             memcpy(lcd_patterns[pat].pattern, pattern, HW_PATTERN_SIZE);
 331     }
 332 }
 333
 334 /** output functions **/
 335
 336 /* Clear the whole display */
 337 void lcd_clear_display(void)
 338 {
 339     int x, y;
 340     struct viewport* old_vp = current_vp;
 341
 342     lcd_scroll_info.lines = 0;
 343     lcd_remove_cursor();
 344
 345     /* Set the default viewport - required for lcd_putxchar */
 346     current_vp = &default_vp;
 347
 348     for (x = 0; x < LCD_WIDTH; x++)
 349         for (y = 0; y < LCD_HEIGHT; y++)
 350             lcd_putxchar(x, y, xspace);
 351
 352     current_vp = old_vp;
 353 }
 354
 355 /* Clear the current viewport */
 356 void lcd_clear_viewport(void)
 357 {
 358     int x, y;
 359
 360     if (current_vp == &default_vp)
 361     {
 362         lcd_clear_display();
 363     }
 364     else
 365     {
 366         /* Remove the cursor if it is within the current viewport */
 367         if (lcd_cursor.enabled &&
 368             (lcd_cursor.x >= current_vp->x) &&
 369             (lcd_cursor.x <= current_vp->x + current_vp->width) &&
 370             (lcd_cursor.y >= current_vp->y) &&
 371             (lcd_cursor.y <= current_vp->y + current_vp->height))
 372         {
 373             lcd_remove_cursor();
 374         }
 375
 376         for (x = 0; x < current_vp->width; x++)
 377             for (y = 0; y < current_vp->height; y++)
 378                 lcd_putxchar(x, y, xspace);
 379
 380         lcd_scroll_stop(current_vp);
 381     }
 382 }
 383
 384 /* Put an unicode character at the given position */
 385 void lcd_putc(int x, int y, unsigned long ucs)
 386 {
 387     if ((unsigned)x >= (unsigned)current_vp->width ||
 388         (unsigned)y >= (unsigned)current_vp->height)
 389         return;
 390
 391     lcd_putxchar(x, y, find_xchar(ucs));
 392 }
 393
 394 /* Show cursor (alternating with existing character) at the given position */
 395 void lcd_put_cursor(int x, int y, unsigned long cursor_ucs)
 396 {
 397     if ((unsigned)x >= (unsigned)current_vp->width ||
 398         (unsigned)y >= (unsigned)current_vp->height ||
 399         lcd_cursor.enabled)
 400         return;
 401
 402     lcd_cursor.enabled = true;
 403     lcd_cursor.visible = false;
 404     lcd_cursor.hw_char = map_xchar(find_xchar(cursor_ucs), &lcd_cursor.subst_char);
 405     lcd_cursor.x = current_vp->x + x;
 406     lcd_cursor.y = current_vp->y + y;
 407     lcd_cursor.downcount = 0;
 408     lcd_cursor.divider = MAX((HZ/2) / lcd_scroll_info.ticks, 1);
 409 }
 410
 411 /* Remove the cursor */
 412 void lcd_remove_cursor(void)
 413 {
 414     if (lcd_cursor.enabled)
 415     {
 416         if (lcd_cursor.hw_char < lcd_pattern_count)  /* soft char, unmap */
 417             lcd_patterns[lcd_cursor.hw_char].count--;
 418
 419         lcd_cursor.enabled = lcd_cursor.visible = false;
 420     }
 421 }
 422
 423 /* Put a string at a given position, skipping first ofs chars */
 424 static int lcd_putsxyofs(int x, int y, int ofs, const unsigned char *str)
 425 {
 426     unsigned short ucs;
 427     const unsigned char *utf8 = str;
 428
 429     while (*utf8 && x < current_vp->width)
 430     {
 431         utf8 = utf8decode(utf8, &ucs);
 432
 433         if (ofs > 0)
 434         {
 435             ofs--;
 436             continue;
 437         }
 438         lcd_putxchar(x++, y, find_xchar(ucs));
 439     }
 440     return x;
 441 }
 442
 443 /* Put a string at a given position */
 444 void lcd_putsxy(int x, int y, const unsigned char *str)
 445 {
 446     if ((unsigned)y >= (unsigned)current_vp->height)
 447         return;
 448
 449     lcd_putsxyofs(x, y, 0, str);
 450 }
 451
 452 /*** Line oriented text output ***/
 453
 454 /* Put a string at a given char position */
 455 void lcd_puts(int x, int y, const unsigned char *str)
 456 {
 457     lcd_puts_offset(x, y, str, 0);
 458 }
 459
 460 /* Formatting version of lcd_puts */
 461 void lcd_putsf(int x, int y, const unsigned char *fmt, ...)
 462 {
 463     va_list ap;
 464     char buf[256];
 465     va_start(ap, fmt);
 466     vsnprintf(buf, sizeof (buf), fmt, ap);
 467     va_end(ap);
 468     lcd_puts(x, y, buf);
 469 }
 470
 471 /* Put a string at a given char position,  skipping first offset chars */
 472 void lcd_puts_offset(int x, int y, const unsigned char *str, int offset)
 473 {
 474     if ((unsigned)y >= (unsigned)current_vp->height)
 475         return;
 476
 477     /* make sure scrolling is turned off on the line we are updating */
 478     lcd_scroll_stop_line(current_vp, y);
 479
 480     x = lcd_putsxyofs(x, y, offset, str);
 481     while (x < current_vp->width)
 482         lcd_putxchar(x++, y, xspace);
 483 }
 484
 485 /** scrolling **/
 486 void lcd_puts_scroll(int x, int y, const unsigned char *string)
 487 {
 488     lcd_puts_scroll_offset(x, y, string, 0);
 489 }
 490
 491 void lcd_puts_scroll_offset(int x, int y, const unsigned char *string,
 492                             int offset)
 493 {
 494     struct scrollinfo* s;
 495     int len;
 496
 497     if ((unsigned)y >= (unsigned)current_vp->height)
 498         return;
 499
 500     /* remove any previously scrolling line at the same location */
 501     lcd_scroll_stop_line(current_vp, y);
 502
 503     if (lcd_scroll_info.lines >= LCD_SCROLLABLE_LINES) return;
 504
 505     s = &lcd_scroll_info.scroll[lcd_scroll_info.lines];
 506
 507     s->start_tick = current_tick + lcd_scroll_info.delay;
 508
 509     lcd_puts_offset(x, y, string, offset);
 510     len = utf8length(string);
 511
 512     if (current_vp->width - x < len)
 513     {
 514         /* prepare scroll line */
 515         char *end;
 516
 517         memset(s->line, 0, sizeof s->line);
 518         strcpy(s->line, string);
 519
 520         /* get width */
 521         s->len = utf8length(s->line);
 522
 523         /* scroll bidirectional or forward only depending on the string width */
 524         if (lcd_scroll_info.bidir_limit)
 525         {
 526             s->bidir = s->len < (current_vp->width) *
 527                 (100 + lcd_scroll_info.bidir_limit) / 100;
 528         }
 529         else
 530             s->bidir = false;
 531
 532         if (!s->bidir)  /* add spaces if scrolling in the round */
 533         {
 534             strcat(s->line, "   ");
 535             /* get new width incl. spaces */
 536             s->len += SCROLL_SPACING;
 537         }
 538
 539         end = strchr(s->line, '\0');
 540         strlcpy(end, string, utf8seek(s->line, current_vp->width));
 541
 542         s->vp = current_vp;
 543         s->y = y;
 544         s->offset = offset;
 545         s->startx = x;
 546         s->backward = false;
 547         lcd_scroll_info.lines++;
 548     }
 549 }
 550
 551 void lcd_scroll_fn(void)
 552 {
 553     struct scrollinfo* s;
 554     int index;
 555     int xpos, ypos;
 556     bool update;
 557     struct viewport* old_vp = current_vp;
 558
 559     update = false;
 560     for ( index = 0; index < lcd_scroll_info.lines; index++ ) {
 561         s = &lcd_scroll_info.scroll[index];
 562
 563         /* check pause */
 564         if (TIME_BEFORE(current_tick, s->start_tick))
 565             continue;
 566
 567         lcd_set_viewport(s->vp);
 568
 569         if (s->backward)
 570             s->offset--;
 571         else
 572             s->offset++;
 573
 574         xpos = s->startx;
 575         ypos = s->y;
 576
 577         if (s->bidir)  /* scroll bidirectional */
 578         {
 579             if (s->offset <= 0) {
 580                 /* at beginning of line */
 581                 s->offset = 0;
 582                 s->backward = false;
 583                 s->start_tick = current_tick + lcd_scroll_info.delay * 2;
 584             }
 585             if (s->offset >= s->len - (current_vp->width - xpos)) {
 586                 /* at end of line */
 587                 s->offset = s->len - (current_vp->width - xpos);
 588                 s->backward = true;
 589                 s->start_tick = current_tick + lcd_scroll_info.delay * 2;
 590             }
 591         }
 592         else    /* scroll forward the whole time */
 593         {
 594             if (s->offset >= s->len)
 595                 s->offset -= s->len;
 596         }
 597
 598         lcd_putsxyofs(xpos, ypos, s->offset, s->line);
 599         update = true;
 600     }
 601
 602     lcd_set_viewport(old_vp);
 603
 604     if (lcd_cursor.enabled)
 605     {
 606         if (--lcd_cursor.downcount <= 0)
 607         {
 608             lcd_cursor.downcount = lcd_cursor.divider;
 609             lcd_cursor.visible = !lcd_cursor.visible;
 610             update = true;
 611         }
 612     }
 613
 614     if (update)
 615         lcd_update();
 616 }
 617