mdw@git.distorted.org.uk Git - ssr/blob - StraySrc/Libraries/Steel/c/font

   1 /************************************************************************/
   2 /* © Acorn Computers Ltd, 1992.                                         */
   3 /*                                                                      */
   4 /* This file forms part of an unsupported source release of RISC_OSLib. */
   5 /*                                                                      */
   6 /* It may be freely used to create executable images for saleable       */
   7 /* products but cannot be sold in source form or as an object library   */
   8 /* without the prior written consent of Acorn Computers Ltd.            */
   9 /*                                                                      */
  10 /* If this file is re-distributed (even if modified) it should retain   */
  11 /* this copyright notice.                                               */
  12 /*                                                                      */
  13 /************************************************************************/
  14
  15 /*
  16  * Title  : c.font
  17  * Purpose: access to RISC OS font facilities
  18  * History: IDJ: 06-Feb-92: prepared for source release
  19  */
  20
  21 #ifndef __stddef_h
  22 #include <stddef.h>
  23 #endif
  24 #include "h.os"
  25 #include "h.trace"
  26 #include "h.font"
  27
  28
  29 /*                          F O N T    S W I 's                          */
  30 #define CacheAddr            0x40080
  31 #define FindFont             0x40081
  32 #define LoseFont             0x40082
  33 #define ReadDefn             0x40083
  34 #define ReadInfo             0x40084
  35 #define StringWidth          0x40085
  36 #define Paint                0x40086
  37 #define Caret                0x40087
  38 #define ConverttoOS          0x40088
  39 #define Converttopoints      0x40089
  40 #define SetFont              0x4008A
  41 #define CurrentFont          0x4008B
  42 #define FutureFont           0x4008C
  43 #define FindCaret            0x4008D
  44 #define CharBBox             0x4008E
  45 #define ReadScaleFactor      0x4008F
  46 #define SetScaleFactor       0x40090
  47 #define ListFonts            0x40091
  48 #define SetFontColours       0x40092
  49 #define SetPalette           0x40093
  50 #define ReadThresholds       0x40094
  51 #define SetThresholds        0x40095
  52 #define FindCaretJ           0x40096
  53 #define StringBBox           0x40097
  54 #define ReadColourTable      0x40098
  55 #define MakeBitmap           0x40099
  56 #define UnCacheFile          0x4009A
  57 #define SetFontMax           0x4009B
  58 #define ReadFontMax          0x4009C
  59 #define ReadFontPrefix       0x4009D
  60 #define SwitchOutputToBuffer 0x4009E
  61 #define ReadFontMetrics      0x4009F
  62
  63 #pragma no_check_stack
  64
  65 os_error *font_cacheaddress(int *version, int *cacheused, int *cachesize)
  66 {
  67    os_regset r;
  68    os_error *e;
  69
  70    r.r[0] = 0;
  71    e = os_swix(CacheAddr, &r);
  72
  73    if (!e)
  74    {
  75       *version = r.r[0];
  76       *cacheused = r.r[1];
  77       *cachesize = r.r[2];
  78    }
  79
  80    return e;
  81 }
  82
  83
  84 os_error *font_find(char *name, int xsize, int ysize, int xres, int yres, font *fontadd)
  85 {
  86    os_regset r;
  87    os_error *e;
  88
  89    r.r[1] = (int)name;
  90    r.r[2] = xsize;
  91    r.r[3] = ysize;
  92    r.r[4] = xres;
  93    r.r[5] = yres;
  94
  95    e = os_swix(FindFont, &r);
  96
  97    *fontadd = (font) r.r[0];
  98
  99    return e;
 100 }
 101
 102
 103 os_error *font_lose(font f)
 104 {
 105    os_regset r;
 106    os_error *e;
 107
 108    r.r[0] = f;
 109    e = os_swix(LoseFont, &r);
 110    return e;
 111 }
 112
 113
 114 os_error * font_readdef(font f, font_def *d)
 115 {
 116    os_regset r;
 117    os_error *e;
 118
 119    r.r[0] = (int)f;
 120    r.r[1] = (int)&d->name;
 121
 122    e = os_swix(ReadDefn, &r);
 123
 124    d->xsize = r.r[2];
 125    d->ysize = r.r[3];
 126    d->xres = r.r[4];
 127    d->yres = r.r[5];
 128    d->usage = r.r[6];
 129    d->age = r.r[7];
 130
 131    return(e);
 132 }
 133
 134
 135 os_error *font_readinfo(font f, font_info *i)
 136 {
 137    os_regset r;
 138    os_error *e;
 139
 140    r.r[0] = f;
 141
 142    e = os_swix(ReadInfo, &r);
 143
 144    i->minx = r.r[1];
 145    i->miny = r.r[2];
 146    i->maxx = r.r[3];
 147    i->maxy = r.r[4];
 148
 149    return e;
 150 }
 151
 152
 153 os_error *font_strwidth(font_string *fs)
 154 {
 155    os_regset r;
 156    os_error *e;
 157
 158    r.r[1] = (int)fs->s;
 159    r.r[2] = fs->x;
 160    r.r[3] = fs->y;
 161    r.r[4] = fs->split;
 162    r.r[5] = fs->term;
 163
 164    e = os_swix(StringWidth, &r);
 165
 166    fs->x = r.r[2];
 167    fs->y = r.r[3];
 168    fs->split = r.r[4];
 169    fs->term = r.r[5];
 170
 171    return e;
 172 }
 173
 174
 175 os_error *font_paint(char *s, int options, int x, int y)
 176 {
 177    os_regset r;
 178    os_error *e;
 179
 180    r.r[1] = (int)s;
 181    r.r[2] = options;
 182    r.r[3] = x;
 183    r.r[4] = y;
 184
 185    e = os_swix(Paint, &r);
 186
 187    return e;
 188 }
 189
 190
 191 os_error *font_caret(int colour, int height, int flags, int x, int y)
 192 {
 193    os_regset r;
 194    os_error *e;
 195
 196    r.r[0] = colour;
 197    r.r[1] = height;
 198    r.r[2] = flags;
 199    r.r[3] = x;
 200    r.r[4] = y;
 201
 202    e = os_swix(Caret, &r);
 203
 204    return e;
 205 }
 206
 207
 208 os_error *font_converttoos(int x_inch, int y_inch, int *x_os, int *y_os)
 209 {
 210    os_regset r;
 211    os_error *e;
 212
 213    r.r[1] = x_inch;
 214    r.r[2] = y_inch;
 215
 216    e = os_swix(ConverttoOS, &r);
 217
 218    *x_os = r.r[1];
 219    *y_os = r.r[2];
 220
 221    return e;
 222 }
 223
 224
 225 os_error *font_converttopoints(int x_os, int y_os, int *x_inch, int *y_inch)
 226 {
 227    os_regset r;
 228    os_error *e;
 229
 230    r.r[1] = x_os;
 231    r.r[2] = y_os;
 232
 233    e = os_swix(Converttopoints, &r);
 234
 235    *x_inch = r.r[1];
 236    *y_inch = r.r[2];
 237
 238    return e;
 239 }
 240
 241
 242 os_error *font_setfont(font f)
 243 {
 244    os_regset r;
 245    os_error *e;
 246
 247    r.r[0] = f;
 248
 249    e = os_swix(SetFont, &r);
 250
 251    return(e);
 252 }
 253
 254
 255 os_error *font_current(font_state *f)
 256 {
 257    os_regset r;
 258    os_error *e;
 259
 260    e = os_swix(CurrentFont, &r);
 261
 262    f->f = r.r[0];
 263    f->back_colour = r.r[1];
 264    f->fore_colour = r.r[2];
 265    f->offset = r.r[3];
 266
 267    return(e);
 268 }
 269
 270
 271 os_error *font_future(font_state *f)
 272 {
 273    os_regset r;
 274    os_error *e;
 275
 276    e = os_swix(FutureFont, &r);
 277
 278    f->f = r.r[0];
 279    f->back_colour = r.r[1];
 280    f->fore_colour = r.r[2];
 281    f->offset = r.r[3];
 282
 283    return(e);
 284 }
 285
 286
 287 os_error *font_findcaret(font_string *fs)
 288 {
 289    os_regset r;
 290    os_error *e;
 291
 292    r.r[1] = (int)fs->s;
 293    r.r[2] = fs->x;
 294    r.r[3] = fs->y;
 295
 296    e = os_swix(FindCaret, &r);
 297
 298    fs->x = r.r[2];
 299    fs->y = r.r[3];
 300    fs->split = r.r[4];
 301    fs->term = r.r[5];
 302
 303    return e;
 304 }
 305
 306
 307 os_error *font_charbbox(font f, char ch, int options, font_info *i)
 308 {
 309    os_regset r;
 310    os_error *e;
 311
 312    r.r[0] = f;
 313    r.r[1] = ch;
 314    r.r[2] = options;
 315
 316    e = os_swix(CharBBox, &r);
 317
 318    i->minx = r.r[1];
 319    i->miny = r.r[2];
 320    i->maxx = r.r[3];
 321    i->maxy = r.r[4];
 322
 323    return e;
 324 }
 325
 326
 327 os_error *font_readscalefactor(int *x, int *y)
 328 {
 329    os_regset r;
 330    os_error *e;
 331
 332    e = os_swix(ReadScaleFactor, &r);
 333
 334    *x = r.r[1];
 335    *y = r.r[2];
 336
 337    return e;
 338 }
 339
 340
 341 os_error *font_setscalefactor(int x, int y)
 342 {
 343    os_regset r;
 344    os_error *e;
 345
 346    r.r[1] = x;
 347    r.r[2] = y;
 348
 349    e = os_swix(SetScaleFactor, &r);
 350
 351    return e;
 352 }
 353
 354
 355 os_error *font_list(char *a, int *count)
 356 {
 357    os_regset r;
 358    os_error *e;
 359    int i;
 360
 361    r.r[1] = (int)a;
 362    r.r[2] = *count;
 363    r.r[3] = -1;
 364
 365    e = os_swix(ListFonts, &r);
 366
 367    if (!e)
 368    {
 369
 370       *count = r.r[2];
 371       i = 0;
 372
 373       while (a[i] >= 32 && i <= 99)
 374
 375            ++i;
 376
 377       a[i] = 0;
 378
 379    }
 380    else /* error return: probably some filing system error */
 381       *count = -1; /* signal end of list */
 382
 383    return e;
 384
 385 }
 386
 387
 388 os_error *font_setcolour(font f, int background, int foreground, int offset)
 389 {
 390    os_regset r;
 391    os_error *e;
 392
 393    r.r[0] = f;
 394    r.r[1] = background;
 395    r.r[2] = foreground;
 396    r.r[3] = offset;
 397
 398    e = os_swix(SetFontColours, &r);
 399
 400    return e;
 401 }
 402
 403
 404 os_error *font_setpalette(int background, int foreground, int offset,
 405                           int physical_back, int physical_fore)
 406
 407 {
 408    os_regset r;
 409    os_error *e;
 410
 411    r.r[1] = background;
 412    r.r[2] = foreground;
 413    r.r[3] = offset;
 414    r.r[4] = physical_back;
 415    r.r[5] = physical_fore;
 416
 417    e = os_swix(SetPalette, &r);
 418
 419    return e;
 420 }
 421
 422
 423 os_error *font_readthresholds(font_threshold *th)
 424 {
 425    os_regset r;
 426    os_error *e;
 427
 428    r.r[1] = (int)th;
 429
 430    e = os_swix(ReadThresholds, &r);
 431
 432    return e;
 433 }
 434
 435
 436 os_error *font_setthresholds(font_threshold *th)
 437 {
 438    os_regset r;
 439    os_error *e;
 440
 441    r.r[1] = (int)th;
 442
 443    e = os_swix(SetThresholds, &r);
 444
 445    return e;
 446 }
 447
 448
 449 os_error *font_findcaretj(font_string *fs, int offset_x, int offset_y)
 450 {
 451    os_regset r;
 452    os_error *e;
 453
 454    r.r[1] = (int)fs->s;
 455    r.r[2] = fs->x;
 456    r.r[3] = fs->y;
 457    r.r[4] = offset_x;
 458    r.r[5] = offset_y;
 459
 460    e = os_swix(FindCaretJ, &r);
 461
 462    fs->x = r.r[2];
 463    fs->y = r.r[3];
 464    fs->split = r.r[4];
 465    fs->term = r.r[5];
 466
 467    return e;
 468 }
 469
 470
 471 os_error *font_stringbbox(char *s, font_info *fi)
 472 {
 473    os_regset r;
 474    os_error *e;
 475
 476    r.r[1] = (int)s;
 477
 478    e = os_swix(StringBBox, &r);
 479
 480    fi->minx = r.r[1];
 481    fi->miny = r.r[2];
 482    fi->maxx = r.r[3];
 483    fi->maxy = r.r[4];
 484
 485    return e;
 486 }
 487
 488 /*-----------------------------------------------------------------*/
 489 /*Routines for conversion of fonts to Draw module path objects. See
 490    the documentation of SWI Font_SwitchOutputToBuffer.*/
 491
 492 os_error *font_output_to_null (BOOL add_hints, BOOL output_skeleton,
 493                                font_action_on_bitmap action_on_bitmap)
 494
 495 {
 496    os_regset reg_set;
 497    os_error *error;
 498
 499    tracef0 ("font_output_to_null\n");
 500
 501    reg_set.r[0] =
 502       1 /*no output*/ +
 503       (add_hints? 1 << 1: 0) +
 504       (output_skeleton? 1 << 2: 0) +
 505       (  action_on_bitmap == font_ERROR?
 506             1 << 4:
 507          action_on_bitmap == font_CONVERT?
 508             1 << 3:
 509             0
 510       );
 511    reg_set.r[1] = 8;
 512
 513    if ((error = os_swix (SwitchOutputToBuffer, &reg_set)) != NULL)
 514       return error;
 515
 516    return NULL;
 517 }
 518
 519
 520 os_error *font_output_size (size_t *size_ptr)
 521 {
 522    os_regset reg_set;
 523    os_error *error;
 524
 525    tracef0 ("font_output_size\n");
 526
 527    reg_set.r [0] =  0;
 528    reg_set.r [1] = -1;
 529
 530    if ((error = os_swix (SwitchOutputToBuffer, &reg_set)) != NULL)
 531       return error;
 532
 533    *size_ptr = reg_set.r [1];
 534    tracef1 ("font_output_size: made %d bytes of path\n", *size_ptr);
 535    return NULL;
 536 }
 537
 538
 539 os_error *font_output_to_buffer(drawmod_buffer *buff_ptr, BOOL add_hints,
 540                                 BOOL output_skeleton,
 541                                 font_action_on_bitmap action_on_bitmap)
 542
 543 {
 544    os_regset reg_set;
 545    os_error *error;
 546
 547    tracef0 ("font_output_to_buffer\n");
 548
 549    reg_set.r[0] =
 550       (add_hints? 1 << 1: 0) +
 551       (output_skeleton? 1 << 2: 0) +
 552       (  action_on_bitmap == font_ERROR?
 553             1 << 4:
 554          action_on_bitmap == font_CONVERT?
 555             1 << 3:
 556             0
 557       );
 558    reg_set.r[1] = (int) buff_ptr;
 559
 560    tracef1 ("font_output_to_buffer: path going to 0x%p\n", buff_ptr);
 561    if ((error = os_swix (SwitchOutputToBuffer, &reg_set)) != NULL)
 562       return error;
 563
 564    return NULL;
 565 }
 566
 567
 568 os_error *font_output_to_screen (void)
 569 {
 570    os_regset reg_set;
 571    os_error *error;
 572
 573    tracef0 ("font_output_to_screen\n");
 574
 575    reg_set.r [0] = 0;
 576    reg_set.r [1] = 0;
 577
 578    if ((error = os_swix (SwitchOutputToBuffer, &reg_set)) != NULL)
 579       return error;
 580
 581    return NULL;
 582 }
 583
 584 #pragma check_stack