wrlib/nxpm.c

   1 /* nxpm.c - load "normalized" XPM image
   2  *
   3  * Raster graphics library
   4  *
   5  * Copyright (c) 1997-2003 Alfredo K. Kojima
   6  *
   7  *  This library is free software; you can redistribute it and/or
   8  *  modify it under the terms of the GNU Library General Public
   9  *  License as published by the Free Software Foundation; either
  10  *  version 2 of the License, or (at your option) any later version.
  11  *
  12  *  This library is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  *  Library General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU Library General Public
  18  *  License along with this library; if not, write to the Free
  19  *  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include <config.h>
  23
  24 /* AIX requires this to be the first thing in the file.  */
  25 #ifdef __GNUC__
  26 # define alloca __builtin_alloca
  27 #else
  28 # if HAVE_ALLOCA_H
  29 #  include <alloca.h>
  30 # else
  31 #  ifdef _AIX
  32 #   pragma alloca
  33 #  else
  34 #   ifndef alloca /* predefined by HP cc +Olibcalls */
  35 char *alloca ();
  36 #   endif
  37 #  endif
  38 # endif
  39 #endif
  40
  41
  42 #include <stdlib.h>
  43 #include <stdio.h>
  44 #include <string.h>
  45 #include <assert.h>
  46 #include <errno.h>
  47
  48 #include "wraster.h"
  49
  50
  51 /*
  52  * Restricted support for XPM images.
  53  *
  54  * The images must be in the following "normalized" format:
  55  *
  56  *
  57  * line         content
  58  * 1            signature comment
  59  * 2            ignored ( normally "static char *xpm[] = {" )
  60  * 3            "width height color_count chars" where chars is 1 or 2
  61  * 4            color definitions. Only c values with #rrggbb or #rrrrggggbbb
  62  *                      format OR None
  63  * n            data
  64  *
  65  * - no comments or blank lines are allowed, except for the signature
  66  * - all lines must have at most 256 characters
  67  * - no white spaces allowed at left of each line
  68  */
  69
  70 #define LINEWIDTH 64
  71
  72 #ifndef USE_XPM
  73
  74
  75 RImage*
  76 RGetImageFromXPMData(RContext *context, char **data)
  77 {
  78     RImage *image = NULL;
  79     unsigned char *color_table[4];
  80     unsigned short *symbol_table;
  81     unsigned char *r, *g, *b, *a;
  82     int i, j, k, line = 0;
  83     int transp;
  84     unsigned short color;
  85     int bsize;
  86     int w, h, ccount, csize;
  87
  88     if (sscanf(data[line++], "%i %i %i %i", &w, &h, &ccount, &csize)!=4
  89         || w <= 0 || h <= 0 || ccount <= 0 || csize <= 0)
  90         goto bad_format;
  91
  92     if (csize!=1 && csize!=2)
  93         goto bad_format;
  94
  95     color_table[0] = alloca(ccount);
  96     color_table[1] = alloca(ccount);
  97     color_table[2] = alloca(ccount);
  98     color_table[3] = alloca(ccount);
  99     symbol_table = alloca(ccount * sizeof(unsigned short));
 100
 101     bsize = csize * w + 16;
 102
 103     if (!color_table[0] || !color_table[1] || !color_table[2] ||
 104         !color_table[3] || !symbol_table || !bsize) {
 105         RErrorCode = RERR_NOMEMORY;
 106         alloca(0);
 107         return NULL;
 108     }
 109
 110     transp = 0;
 111     /* get color table */
 112     for (i=0; i<ccount; i++) {
 113         symbol_table[i] = data[line][0];
 114         if (csize==2)
 115             symbol_table[i] |= data[line][1]<<8;
 116
 117         j = csize;
 118         while (data[line][j]!='#' && data[line][j]!=0
 119                && data[line][j]!='N') j++;
 120
 121         if (data[line][j]=='#') {
 122             unsigned int red, green, blue;
 123
 124             k = 0;
 125             j++;
 126             while (data[line][j+k]!=0) k++;
 127             if (k==6) {
 128                 if (sscanf(&(data[line][j]), "%2x%2x%2x", &red, &green, &blue)!=3)
 129                     goto bad_format;
 130             } else if (k==12) {
 131                 if (sscanf(&(data[line][j]), "%4x%4x%4x", &red, &green, &blue)!=3)
 132                     goto bad_format;
 133                 red >>= 8;
 134                 green >>= 8;
 135                 blue >>= 8;
 136             } else
 137                 goto bad_format;
 138
 139             color_table[0][i] = red;
 140             color_table[1][i] = green;
 141             color_table[2][i] = blue;
 142             color_table[3][i] = 255;
 143         } else if (strncmp(&(data[line][j]), "None", 4)==0
 144                    || strncmp(&(data[line][j]), "none", 4)==0) {
 145             color_table[3][i] = 0;
 146             transp = 1;
 147         } else {
 148             goto bad_format;
 149         }
 150         line++;
 151     }
 152
 153     image = RCreateImage(w, h, transp);
 154     if (!image) {
 155         alloca(0);
 156         return NULL;
 157     }
 158
 159     r = image->data;
 160     g = image->data+1;
 161     b = image->data+2;
 162     if (image->format == RRGBAFormat)
 163         a = image->data+3;
 164     else
 165         a = NULL;
 166
 167     for (i=0; i<h; i++) {
 168         if (csize==1) {
 169             for (j=0; j<w; j++) {
 170                 color = data[line][j];
 171
 172                 for (k=0; k<ccount; k++) {
 173                     if (symbol_table[k] == color)
 174                         break;
 175                 }
 176                 if (k==ccount)
 177                     k = 0;
 178
 179                 *r = color_table[0][k];
 180                 *g = color_table[1][k];
 181                 *b = color_table[2][k];
 182                 if (a) {
 183                     *a = color_table[3][k];
 184                     r += 4; g += 4; b += 4; a += 4;
 185                 } else {
 186                     r += 3; g += 3; b += 3;
 187                 }
 188             }
 189         } else {
 190             for (j=0; j<w*2; j++) {
 191                 color = data[line][j++];
 192                 color |= data[line][j];
 193
 194                 for (k=0; k<ccount; k++) {
 195                     if (symbol_table[k] == color)
 196                         break;
 197                 }
 198                 if (k==ccount)
 199                     k = 0;
 200
 201                 *r = color_table[0][k];
 202                 *g = color_table[1][k];
 203                 *b = color_table[2][k];
 204                 if (a) {
 205                     *a = color_table[3][k];
 206                     r += 4; g += 4; b += 4; a += 4;
 207                 } else {
 208                     r += 3; g += 3; b += 3;
 209                 }
 210             }
 211         }
 212         line++;
 213     }
 214
 215 #ifdef C_ALLOCA
 216     alloca(0);
 217 #endif
 218     return image;
 219
 220 bad_format:
 221     RErrorCode = RERR_BADIMAGEFILE;
 222 #ifdef C_ALLOCA
 223     alloca(0);
 224 #endif
 225     if (image)
 226         RReleaseImage(image);
 227     return NULL;
 228 }
 229
 230
 231
 232 RImage*
 233 RLoadXPM(RContext *context, char *file, int index)
 234 {
 235     RImage *image = NULL;
 236     char line[LINEWIDTH+1];
 237     char *buffer;
 238     unsigned char *color_table[4];
 239     unsigned short *symbol_table;
 240     unsigned char *r, *g, *b, *a;
 241     int i, j, k;
 242     int transp;
 243     unsigned short color;
 244     int bsize;
 245     int w, h, ccount, csize;
 246     FILE *f;
 247
 248     f = fopen(file, "rb");
 249     if (!f) {
 250         RErrorCode = RERR_OPEN;
 251         return NULL;
 252     }
 253     /* sig */
 254     if (!fgets(line, LINEWIDTH, f))
 255         goto bad_file;
 256     /* declaration */
 257     if (!fgets(line, LINEWIDTH, f))
 258         goto bad_file;
 259
 260     /* data */
 261     if (!fgets(line, LINEWIDTH, f))
 262         goto bad_file;
 263
 264     if (line[0]=='/')
 265         if (!fgets(line, LINEWIDTH, f))
 266             goto bad_file;
 267
 268     if (sscanf(line, "\"%i %i %i %i\"", &w, &h, &ccount, &csize)!=4
 269         || w <= 0 || h <= 0 || ccount <= 0 || csize <= 0)
 270         goto bad_file;
 271
 272     if (csize!=1 && csize!=2)
 273         goto bad_format;
 274
 275     color_table[0] = alloca(ccount);
 276     color_table[1] = alloca(ccount);
 277     color_table[2] = alloca(ccount);
 278     color_table[3] = alloca(ccount);
 279     symbol_table = alloca(ccount * sizeof(unsigned short));
 280
 281     bsize = csize * w + 16;
 282     buffer = alloca(bsize);
 283
 284     if (!color_table[0] || !color_table[1] || !color_table[2] ||
 285         !color_table[3] || !symbol_table || !bsize) {
 286         RErrorCode = RERR_NOMEMORY;
 287         fclose(f);
 288         alloca(0);
 289         return NULL;
 290     }
 291
 292     transp = 0;
 293     /* get color table */
 294     for (i=0; i<ccount; i++) {
 295         if (!fgets(line, LINEWIDTH, f))
 296             goto bad_file;
 297         if (line[0]=='/')
 298             if (!fgets(line, LINEWIDTH, f))
 299                 goto bad_file;
 300
 301         symbol_table[i] = line[1];
 302         if (csize==2)
 303             symbol_table[i] |= line[2]<<8;
 304
 305         j = csize+1;
 306         while (line[j]!='#' && line[j]!='"' && line[j]!=0 && line[j]!='N') j++;
 307
 308         if (line[j]=='#') {
 309             unsigned int red, green, blue;
 310
 311             k = 0;
 312             j++;
 313             while (line[j+k]!='"' && line[j+k]!=0) k++;
 314             if (k==6) {
 315                 if (sscanf(&(line[j]), "%2x%2x%2x", &red, &green, &blue)!=3)
 316                     goto bad_format;
 317             } else if (k==12) {
 318                 if (sscanf(&(line[j]), "%4x%4x%4x", &red, &green, &blue)!=3)
 319                     goto bad_format;
 320                 red >>= 8;
 321                 green >>= 8;
 322                 blue >>= 8;
 323             } else
 324                 goto bad_format;
 325
 326             color_table[0][i] = red;
 327             color_table[1][i] = green;
 328             color_table[2][i] = blue;
 329             color_table[3][i] = 255;
 330         } else if (strncmp(&(line[j]), "None", 4)==0
 331                    || strncmp(&(line[j]), "none", 4)==0) {
 332             color_table[3][i] = 0;
 333             transp = 1;
 334         } else {
 335             goto bad_format;
 336         }
 337     }
 338
 339     image = RCreateImage(w, h, transp);
 340     if (!image) {
 341         fclose(f);
 342         alloca(0);
 343         return NULL;
 344     }
 345
 346     r = image->data;
 347     g = image->data+1;
 348     b = image->data+2;
 349     if (image->format == RRGBAFormat)
 350         a = image->data+3;
 351     else
 352         a = NULL;
 353
 354     for (i=0; i<h; i++) {
 355         if (!fgets(buffer, bsize, f))
 356             goto bad_file;
 357         if (buffer[0]=='/')
 358             if (!fgets(buffer, bsize, f))
 359                 goto bad_file;
 360
 361         if (csize==1) {
 362             for (j=1; j<=w; j++) {
 363                 color = buffer[j];
 364
 365                 for (k=0; k<ccount; k++) {
 366                     if (symbol_table[k] == color)
 367                         break;
 368                 }
 369                 if (k==ccount)
 370                     k = 0;
 371
 372                 *r = color_table[0][k];
 373                 *g = color_table[1][k];
 374                 *b = color_table[2][k];
 375                 if (a) {
 376                     *a = color_table[3][k];
 377                     r += 4; g += 4; b += 4; a += 4;
 378                 } else {
 379                     r += 3; g += 3; b += 3;
 380                 }
 381             }
 382         } else {
 383             for (j=1; j<=w*2; j++) {
 384                 color = buffer[j++];
 385                 color |= buffer[j] << 8;
 386
 387                 for (k=0; k<ccount; k++) {
 388                     if (symbol_table[k] == color)
 389                         break;
 390                 }
 391                 if (k==ccount) {
 392                     k = 0;
 393                 }
 394
 395                 *r = color_table[0][k];
 396                 *g = color_table[1][k];
 397                 *b = color_table[2][k];
 398                 if (a) {
 399                     *a = color_table[3][k];
 400                     r += 4; g += 4; b += 4; a += 4;
 401                 } else {
 402                     r += 3; g += 3; b += 3;
 403                 }
 404             }
 405         }
 406     }
 407
 408     fclose(f);
 409 #ifdef C_ALLOCA
 410     alloca(0);
 411 #endif
 412     return image;
 413
 414 bad_format:
 415     RErrorCode = RERR_BADIMAGEFILE;
 416     fclose(f);
 417 #ifdef C_ALLOCA
 418     alloca(0);
 419 #endif
 420     if (image)
 421         RReleaseImage(image);
 422     return NULL;
 423
 424 bad_file:
 425     RErrorCode = RERR_BADIMAGEFILE;
 426     fclose(f);
 427 #ifdef C_ALLOCA
 428     alloca(0);
 429 #endif
 430     if (image)
 431         RReleaseImage(image);
 432     return NULL;
 433 }
 434
 435 #endif
 436
 437
 438 typedef struct XPMColor {
 439     unsigned char red;
 440     unsigned char green;
 441     unsigned char blue;
 442     int index;
 443     struct XPMColor *next;
 444 } XPMColor;
 445
 446
 447
 448 #define I2CHAR(i)       ((i)<12 ? (i)+'0' : ((i)<38 ? (i)+'A'-12 : (i)+'a'-38))
 449 #define CINDEX(xpmc)    (((unsigned)(xpmc)->red)<<16|((unsigned)(xpmc)->green)<<8|((unsigned)(xpmc)->blue))
 450
 451
 452
 453 static XPMColor*
 454 lookfor(XPMColor *list, int index)
 455 {
 456     if (!list)
 457         return NULL;
 458
 459     for (; list!=NULL; list=list->next) {
 460         if (CINDEX(list) == index)
 461             return list;
 462     }
 463     return NULL;
 464 }
 465
 466 /*
 467  * Looks for the color in the colormap and inserts if it is not found.
 468  *
 469  * list is a binary search list. The unbalancing problem is just ignored.
 470  *
 471  * Returns False on error
 472  */
 473 static Bool
 474 addcolor(XPMColor **list, unsigned r, unsigned g, unsigned b, int *colors)
 475 {
 476     XPMColor *tmpc;
 477     XPMColor *newc;
 478     int index;
 479
 480     index = r<<16|g<<8|b;
 481     tmpc = *list;
 482
 483     tmpc = lookfor(*list, index);
 484
 485     if (tmpc)
 486         return True;
 487
 488     newc = malloc(sizeof(XPMColor));
 489
 490     if (!newc) {
 491
 492         RErrorCode = RERR_NOMEMORY;
 493
 494         return False;
 495     }
 496
 497     newc->red = r;
 498     newc->green = g;
 499     newc->blue = b;
 500     newc->next = *list;
 501     *list = newc;
 502
 503     (*colors)++;
 504
 505     return True;
 506 }
 507
 508
 509 static char*
 510 index2str(char *buffer, int index, int charsPerPixel)
 511 {
 512     int i;
 513
 514     for (i=0; i<charsPerPixel; i++) {
 515         buffer[i] = I2CHAR(index&63);
 516         index >>= 6;
 517     }
 518     buffer[i] = 0;
 519
 520     return buffer;
 521 }
 522
 523
 524 static void
 525 outputcolormap(FILE *file, XPMColor *colormap, int charsPerPixel)
 526 {
 527     int index;
 528     char buf[128];
 529
 530     if (!colormap)
 531         return;
 532
 533     for (index=0; colormap!=NULL; colormap=colormap->next,index++) {
 534         colormap->index = index;
 535         fprintf(file, "\"%s c #%02x%02x%02x\",\n",
 536                 index2str(buf, index, charsPerPixel), colormap->red,
 537                 colormap->green, colormap->blue);
 538     }
 539 }
 540
 541
 542 static void
 543 freecolormap(XPMColor *colormap)
 544 {
 545     XPMColor *tmp;
 546
 547     while (colormap) {
 548         tmp = colormap->next;
 549         free(colormap);
 550         colormap = tmp;
 551     }
 552 }
 553
 554
 555
 556 /* save routine is common to internal support and library support */
 557 Bool
 558 RSaveXPM(RImage *image, char *filename)
 559 {
 560     FILE *file;
 561     int x, y;
 562     int colorCount=0;
 563     int charsPerPixel;
 564     XPMColor *colormap = NULL;
 565     XPMColor *tmpc;
 566     int i;
 567     int ok = 0;
 568     unsigned char *r, *g, *b, *a;
 569     char transp[16];
 570     char buf[128];
 571
 572     file = fopen(filename, "wb+");
 573     if (!file) {
 574         RErrorCode = RERR_OPEN;
 575         return False;
 576     }
 577
 578     fprintf(file, "/* XPM */\n");
 579
 580     fprintf(file, "static char *image[] = {\n");
 581
 582     r = image->data;
 583     g = image->data+1;
 584     b = image->data+2;
 585     if (image->format == RRGBAFormat)
 586         a = image->data+3;
 587     else
 588         a = NULL;
 589
 590     /* first pass: make colormap for the image */
 591     if (a)
 592         colorCount = 1;
 593     for (y = 0; y < image->height; y++) {
 594         for (x = 0; x < image->width; x++) {
 595             if (!a || *a>127) {
 596                 if (!addcolor(&colormap, *r, *g, *b, &colorCount)) {
 597                     goto uhoh;
 598                 }
 599             }
 600             if (a) {
 601                 r += 4; g += 4; b += 4; a += 4;
 602             } else {
 603                 r += 3; g += 3; b += 3;
 604             }
 605         }
 606     }
 607
 608     charsPerPixel = 1;
 609     while ((1 << charsPerPixel*6) < colorCount)
 610         charsPerPixel++;
 611
 612     /* write header info */
 613     fprintf(file, "\"%i %i %i %i\",\n", image->width, image->height,
 614             colorCount, charsPerPixel);
 615
 616     /* write colormap data */
 617     if (a) {
 618         for (i=0; i<charsPerPixel; i++)
 619             transp[i] = ' ';
 620         transp[i] = 0;
 621
 622         fprintf(file, "\"%s c None\",\n", transp);
 623     }
 624
 625     i = 0;
 626     outputcolormap(file, colormap, charsPerPixel);
 627
 628
 629     r = image->data;
 630     g = image->data+1;
 631     b = image->data+2;
 632     if (image->format == RRGBAFormat)
 633         a = image->data+3;
 634     else
 635         a = NULL;
 636
 637     /* write data */
 638     for (y = 0; y < image->height; y++) {
 639
 640         fprintf(file, "\"");
 641
 642         for (x = 0; x < image->width; x++) {
 643
 644             if (!a || *a>127) {
 645                 tmpc = lookfor(colormap, (unsigned)*r<<16|(unsigned)*g<<8|(unsigned)*b);
 646
 647                 fprintf(file, index2str(buf, tmpc->index, charsPerPixel));
 648             } else {
 649                 fprintf(file, transp);
 650             }
 651
 652             if (a) {
 653                 r += 4; g += 4; b += 4; a += 4;
 654             } else {
 655                 r += 3; g += 3; b += 3;
 656             }
 657         }
 658
 659         if (y < image->height-1)
 660             fprintf(file, "\",\n");
 661         else
 662             fprintf(file, "\"};\n");
 663     }
 664
 665     ok = 1;
 666 uhoh:
 667     errno = 0;
 668     fclose(file);
 669     if (ok && errno==ENOSPC) {
 670         RErrorCode = RERR_WRITE;
 671     }
 672
 673     freecolormap(colormap);
 674
 675     return ok ? True : False;
 676 }
 677
 678