wrlib/nxpm.c

   1 /* nxpm.c - load "normalized" XPM image
   2  *
   3  *  Raster graphics library
   4  *
   5  *  Copyright (c) 1997 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             }
 185         } else {
 186             for (j=0; j<w*2; j++) {
 187                 color = data[line][j++];
 188                 color |= data[line][j];
 189
 190                 for (k=0; k<ccount; k++) {
 191                     if (symbol_table[k] == color)
 192                         break;
 193                 }
 194                 if (k==ccount)
 195                     k = 0;
 196
 197                 *(r++) = color_table[0][k];
 198                 *(g++) = color_table[1][k];
 199                 *(b++) = color_table[2][k];
 200                 if (a)
 201                     *(a++) = color_table[3][k];
 202             }
 203         }
 204         line++;
 205     }
 206
 207 #ifdef C_ALLOCA
 208     alloca(0);
 209 #endif
 210     return image;
 211
 212   bad_format:
 213     RErrorCode = RERR_BADIMAGEFILE;
 214 #ifdef C_ALLOCA
 215     alloca(0);
 216 #endif
 217     if (image)
 218         RDestroyImage(image);
 219     return NULL;
 220 }
 221
 222
 223
 224 RImage*
 225 RLoadXPM(RContext *context, char *file, int index)
 226 {
 227     RImage *image = NULL;
 228     char line[LINEWIDTH+1];
 229     char *buffer;
 230     unsigned char *color_table[4];
 231     unsigned short *symbol_table;
 232     unsigned char *r, *g, *b, *a;
 233     int i, j, k;
 234     int transp;
 235     unsigned short color;
 236     int bsize;
 237     int w, h, ccount, csize;
 238     FILE *f;
 239
 240     f = fopen(file, "r");
 241     if (!f) {
 242         RErrorCode = RERR_OPEN;
 243         return NULL;
 244     }
 245     /* sig */
 246     if (!fgets(line, LINEWIDTH, f))
 247         goto bad_file;
 248     /* declaration */
 249     if (!fgets(line, LINEWIDTH, f))
 250         goto bad_file;
 251
 252     /* data */
 253     if (!fgets(line, LINEWIDTH, f))
 254         goto bad_file;
 255
 256     if (line[0]=='/')
 257         if (!fgets(line, LINEWIDTH, f))
 258             goto bad_file;
 259
 260     if (sscanf(line, "\"%i %i %i %i\"", &w, &h, &ccount, &csize)!=4
 261         || w <= 0 || h <= 0 || ccount <= 0 || csize <= 0)
 262         goto bad_file;
 263
 264     if (csize!=1 && csize!=2)
 265         goto bad_format;
 266
 267     color_table[0] = alloca(ccount);
 268     color_table[1] = alloca(ccount);
 269     color_table[2] = alloca(ccount);
 270     color_table[3] = alloca(ccount);
 271     symbol_table = alloca(ccount * sizeof(unsigned short));
 272
 273     bsize = csize * w + 16;
 274     buffer = alloca(bsize);
 275
 276     if (!color_table[0] || !color_table[1] || !color_table[2] ||
 277         !color_table[3] || !symbol_table || !bsize) {
 278         RErrorCode = RERR_NOMEMORY;
 279         fclose(f);
 280         alloca(0);
 281         return NULL;
 282     }
 283
 284     transp = 0;
 285     /* get color table */
 286     for (i=0; i<ccount; i++) {
 287         if (!fgets(line, LINEWIDTH, f))
 288             goto bad_file;
 289         if (line[0]=='/')
 290             if (!fgets(line, LINEWIDTH, f))
 291                 goto bad_file;
 292
 293         symbol_table[i] = line[1];
 294         if (csize==2)
 295             symbol_table[i] |= line[2]<<8;
 296
 297         j = csize+1;
 298         while (line[j]!='#' && line[j]!='"' && line[j]!=0 && line[j]!='N') j++;
 299
 300         if (line[j]=='#') {
 301             unsigned int red, green, blue;
 302
 303             k = 0;
 304             j++;
 305             while (line[j+k]!='"' && line[j+k]!=0) k++;
 306             if (k==6) {
 307                 if (sscanf(&(line[j]), "%2x%2x%2x", &red, &green, &blue)!=3)
 308                     goto bad_format;
 309             } else if (k==12) {
 310                 if (sscanf(&(line[j]), "%4x%4x%4x", &red, &green, &blue)!=3)
 311                     goto bad_format;
 312                 red >>= 8;
 313                 green >>= 8;
 314                 blue >>= 8;
 315             } else
 316                 goto bad_format;
 317
 318             color_table[0][i] = red;
 319             color_table[1][i] = green;
 320             color_table[2][i] = blue;
 321             color_table[3][i] = 255;
 322         } else if (strncmp(&(line[j]), "None", 4)==0
 323                    || strncmp(&(line[j]), "none", 4)==0) {
 324             color_table[3][i] = 0;
 325             transp = 1;
 326         } else {
 327             goto bad_format;
 328         }
 329     }
 330
 331     image = RCreateImage(w, h, transp);
 332     if (!image) {
 333         fclose(f);
 334         alloca(0);
 335         return NULL;
 336     }
 337
 338     r = image->data;
 339     g = image->data+1;
 340     b = image->data+2;
 341     if (image->format == RRGBAFormat)
 342         a = image->data+3;
 343     else
 344         a = NULL;
 345
 346     for (i=0; i<h; i++) {
 347         if (!fgets(buffer, bsize, f))
 348             goto bad_file;
 349         if (buffer[0]=='/')
 350             if (!fgets(buffer, bsize, f))
 351                 goto bad_file;
 352
 353         if (csize==1) {
 354             for (j=1; j<=w; j++) {
 355                 color = buffer[j];
 356
 357                 for (k=0; k<ccount; k++) {
 358                     if (symbol_table[k] == color)
 359                         break;
 360                 }
 361                 if (k==ccount)
 362                     k = 0;
 363
 364                 *(r++) = color_table[0][k];
 365                 *(g++) = color_table[1][k];
 366                 *(b++) = color_table[2][k];
 367                 if (a)
 368                     *(a++) = color_table[3][k];
 369             }
 370         } else {
 371             for (j=1; j<=w*2; j++) {
 372                 color = buffer[j++];
 373                 color |= buffer[j] << 8;
 374
 375                 for (k=0; k<ccount; k++) {
 376                     if (symbol_table[k] == color)
 377                         break;
 378                 }
 379                 if (k==ccount) {
 380                     k = 0;
 381                 }
 382
 383                 *(r++) = color_table[0][k];
 384                 *(g++) = color_table[1][k];
 385                 *(b++) = color_table[2][k];
 386                 if (a)
 387                     *(a++) = color_table[3][k];
 388             }
 389         }
 390     }
 391
 392     fclose(f);
 393 #ifdef C_ALLOCA
 394     alloca(0);
 395 #endif
 396     return image;
 397
 398   bad_format:
 399     RErrorCode = RERR_BADIMAGEFILE;
 400     fclose(f);
 401 #ifdef C_ALLOCA
 402     alloca(0);
 403 #endif
 404     if (image)
 405         RDestroyImage(image);
 406     return NULL;
 407
 408   bad_file:
 409     RErrorCode = RERR_BADIMAGEFILE;
 410     fclose(f);
 411 #ifdef C_ALLOCA
 412     alloca(0);
 413 #endif
 414     if (image)
 415         RDestroyImage(image);
 416     return NULL;
 417 }
 418
 419 #endif
 420
 421
 422 typedef struct XPMColor {
 423     unsigned char red;
 424     unsigned char green;
 425     unsigned char blue;
 426     int index;
 427     struct XPMColor *next;
 428 } XPMColor;
 429
 430
 431
 432 #define I2CHAR(i)       ((i)<12 ? (i)+'0' : ((i)<38 ? (i)+'A'-12 : (i)+'a'-38))
 433 #define CINDEX(xpmc)    (((unsigned)(xpmc)->red)<<16|((unsigned)(xpmc)->green)<<8|((unsigned)(xpmc)->blue))
 434
 435
 436
 437 static XPMColor*
 438 lookfor(XPMColor *list, int index)
 439 {
 440     if (!list)
 441         return NULL;
 442
 443     for (; list!=NULL; list=list->next) {
 444         if (CINDEX(list) == index)
 445             return list;
 446     }
 447     return NULL;
 448 }
 449
 450 /*
 451  * Looks for the color in the colormap and inserts if it is not found.
 452  *
 453  * list is a binary search list. The unbalancing problem is just ignored.
 454  *
 455  * Returns False on error
 456  */
 457 static Bool
 458 addcolor(XPMColor **list, unsigned r, unsigned g, unsigned b, int *colors)
 459 {
 460     XPMColor *tmpc;
 461     XPMColor *newc;
 462     int index;
 463
 464     index = r<<16|g<<8|b;
 465     tmpc = *list;
 466
 467     tmpc = lookfor(*list, index);
 468
 469     if (tmpc)
 470         return True;
 471
 472     newc = malloc(sizeof(XPMColor));
 473
 474     if (!newc) {
 475
 476         RErrorCode = RERR_NOMEMORY;
 477
 478         return False;
 479     }
 480
 481     newc->red = r;
 482     newc->green = g;
 483     newc->blue = b;
 484     newc->next = *list;
 485     *list = newc;
 486
 487     (*colors)++;
 488
 489     return True;
 490 }
 491
 492
 493 static char*
 494 index2str(char *buffer, int index, int charsPerPixel)
 495 {
 496     int i;
 497
 498     for (i=0; i<charsPerPixel; i++) {
 499         buffer[i] = I2CHAR(index&63);
 500         index >>= 6;
 501     }
 502     buffer[i] = 0;
 503
 504     return buffer;
 505 }
 506
 507
 508 static void
 509 outputcolormap(FILE *file, XPMColor *colormap, int charsPerPixel)
 510 {
 511     int index;
 512     char buf[128];
 513
 514     if (!colormap)
 515         return;
 516
 517     for (index=0; colormap!=NULL; colormap=colormap->next,index++) {
 518         colormap->index = index;
 519         fprintf(file, "\"%s c #%02x%02x%02x\",\n",
 520                 index2str(buf, index, charsPerPixel), colormap->red,
 521                 colormap->green, colormap->blue);
 522     }
 523 }
 524
 525
 526 static void
 527 freecolormap(XPMColor *colormap)
 528 {
 529     XPMColor *tmp;
 530
 531     while (colormap) {
 532         tmp = colormap->next;
 533         free(colormap);
 534         colormap = tmp;
 535     }
 536 }
 537
 538
 539
 540 /* save routine is common to internal support and library support */
 541 Bool
 542 RSaveXPM(RImage *image, char *filename)
 543 {
 544     FILE *file;
 545     int x, y;
 546     int colorCount=0;
 547     int charsPerPixel;
 548     XPMColor *colormap = NULL;
 549     XPMColor *tmpc;
 550     int i;
 551     int ok = 0;
 552     unsigned char *r, *g, *b, *a;
 553     char transp[16];
 554     char buf[128];
 555
 556     file = fopen(filename, "w+");
 557     if (!file) {
 558         RErrorCode = RERR_OPEN;
 559         return False;
 560     }
 561
 562     fprintf(file, "/* XPM */\n");
 563
 564     fprintf(file, "static char *image[] = {\n");
 565
 566     r = image->data;
 567     g = image->data+1;
 568     b = image->data+2;
 569     if (image->format == RRGBAFormat)
 570         a = image->data+3;
 571     else
 572         a = NULL;
 573
 574     /* first pass: make colormap for the image */
 575     if (a)
 576         colorCount = 1;
 577     for (y = 0; y < image->height; y++) {
 578         for (x = 0; x < image->width; x++) {
 579             if (!a || *a++>127)
 580                 if (!addcolor(&colormap, *r, *g, *b, &colorCount)) {
 581                     goto uhoh;
 582                 }
 583             r++; g++; b++;
 584         }
 585     }
 586
 587     charsPerPixel = 1;
 588     while ((1 << charsPerPixel*6) < colorCount)
 589         charsPerPixel++;
 590
 591     /* write header info */
 592     fprintf(file, "\"%i %i %i %i\",\n", image->width, image->height,
 593             colorCount, charsPerPixel);
 594
 595     /* write colormap data */
 596     if (image->data[3]) {
 597         for (i=0; i<charsPerPixel; i++)
 598             transp[i] = ' ';
 599         transp[i] = 0;
 600
 601         fprintf(file, "\"%s c None\",\n", transp);
 602     }
 603
 604     i = 0;
 605     outputcolormap(file, colormap, charsPerPixel);
 606
 607
 608     r = image->data;
 609     g = image->data+1;
 610     b = image->data+2;
 611     if (image->format == RRGBAFormat)
 612         a = image->data+3;
 613     else
 614         a = NULL;
 615
 616     /* write data */
 617     for (y = 0; y < image->height; y++) {
 618
 619         fprintf(file, "\"");
 620
 621         for (x = 0; x < image->width; x++) {
 622
 623             if (!a || *a++>127) {
 624                 tmpc = lookfor(colormap, (unsigned)*r<<16|(unsigned)*g<<8|(unsigned)*b);
 625
 626                 fprintf(file, index2str(buf, tmpc->index, charsPerPixel));
 627             } else {
 628                 fprintf(file, transp);
 629             }
 630
 631             r++; g++; b++;
 632         }
 633
 634         if (y < image->height-1)
 635             fprintf(file, "\",\n");
 636         else
 637             fprintf(file, "\"};\n");
 638     }
 639
 640     ok = 1;
 641 uhoh:
 642     errno = 0;
 643     fclose(file);
 644     if (ok && errno==ENOSPC) {
 645         RErrorCode = RERR_WRITE;
 646     }
 647
 648     freecolormap(colormap);
 649
 650     return ok ? True : False;
 651 }
 652
 653