src/common/image.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        image.cpp
   3 // Purpose:     wxImage
   4 // Author:      Robert Roebling
   5 // RCS-ID:      $Id$
   6 // Copyright:   (c) Robert Roebling
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 #ifdef __GNUG__
  11 #pragma implementation "image.h"
  12 #endif
  13
  14 // For compilers that support precompilation, includes "wx.h".
  15 #include "wx/wxprec.h"
  16
  17 #ifdef __BORLANDC__
  18 #pragma hdrstop
  19 #endif
  20
  21 #include "wx/image.h"
  22 #include "wx/debug.h"
  23 #include "wx/log.h"
  24 #include "../png/png.h"
  25 #include "wx/filefn.h"
  26
  27 //-----------------------------------------------------------------------------
  28 // wxImage
  29 //-----------------------------------------------------------------------------
  30
  31 class wxImageRefData: public wxObjectRefData
  32 {
  33
  34 public:
  35   wxImageRefData(void);
  36   ~wxImageRefData(void);
  37
  38   int             m_width;
  39   int             m_height;
  40   unsigned char  *m_data;
  41   bool            m_hasMask;
  42   unsigned char   m_maskRed,m_maskGreen,m_maskBlue;
  43   bool            m_ok;
  44 };
  45
  46 wxImageRefData::wxImageRefData(void)
  47 {
  48     m_width = 0;
  49     m_height = 0;
  50     m_data = (unsigned char*) NULL;
  51     m_ok = FALSE;
  52     m_maskRed = 0;
  53     m_maskGreen = 0;
  54     m_maskBlue = 0;
  55     m_hasMask = FALSE;
  56 }
  57
  58 wxImageRefData::~wxImageRefData(void)
  59 {
  60     if (m_data) free( m_data );
  61 }
  62
  63 wxList wxImage::sm_handlers;
  64
  65 //-----------------------------------------------------------------------------
  66
  67 #define M_IMGDATA ((wxImageRefData *)m_refData)
  68
  69 #if !USE_SHARED_LIBRARIES
  70 IMPLEMENT_DYNAMIC_CLASS(wxImage, wxObject)
  71 #endif
  72
  73 wxImage::wxImage()
  74 {
  75 }
  76
  77 wxImage::wxImage( int width, int height )
  78 {
  79     Create( width, height );
  80 }
  81
  82 wxImage::wxImage( const wxString& name, long type )
  83 {
  84     LoadFile( name, type );
  85 }
  86
  87 wxImage::wxImage( const wxImage& image )
  88 {
  89     Ref(image);
  90 }
  91
  92 wxImage::wxImage( const wxImage* image )
  93 {
  94     if (image) Ref(*image);
  95 }
  96
  97 void wxImage::Create( int width, int height )
  98 {
  99     m_refData = new wxImageRefData();
 100
 101     M_IMGDATA->m_data = (unsigned char *) malloc( width*height*3 );
 102     if (M_IMGDATA->m_data)
 103     {
 104         for (int l = 0; l < width*height*3; l++) M_IMGDATA->m_data[l] = 0;
 105
 106         M_IMGDATA->m_width = width;
 107         M_IMGDATA->m_height = height;
 108         M_IMGDATA->m_ok = TRUE;
 109     }
 110     else
 111     {
 112         UnRef();
 113     }
 114 }
 115
 116 void wxImage::Destroy()
 117 {
 118     UnRef();
 119 }
 120
 121 bool wxImage::Ok() const
 122 {
 123     return (M_IMGDATA && M_IMGDATA->m_ok);
 124 }
 125
 126 char unsigned *wxImage::GetData() const
 127 {
 128     if (!Ok()) return (char unsigned *)NULL;
 129
 130     return M_IMGDATA->m_data;
 131 }
 132
 133 void wxImage::SetData( char unsigned *WXUNUSED(data) )
 134 {
 135 }
 136
 137 void wxImage::SetMaskColour( unsigned char r, unsigned char g, unsigned char b )
 138 {
 139     if (!Ok()) return;
 140
 141     M_IMGDATA->m_maskRed = r;
 142     M_IMGDATA->m_maskGreen = g;
 143     M_IMGDATA->m_maskBlue = b;
 144     M_IMGDATA->m_hasMask = TRUE;
 145 }
 146
 147 unsigned char wxImage::GetMaskRed() const
 148 {
 149     if (!Ok()) return 0;
 150
 151     return M_IMGDATA->m_maskRed;
 152 }
 153
 154 unsigned char wxImage::GetMaskGreen() const
 155 {
 156     if (!Ok()) return 0;
 157
 158     return M_IMGDATA->m_maskGreen;
 159 }
 160
 161 unsigned char wxImage::GetMaskBlue() const
 162 {
 163     if (!Ok()) return 0;
 164
 165     return M_IMGDATA->m_maskBlue;
 166 }
 167
 168 void wxImage::SetMask( bool mask )
 169 {
 170     if (!Ok()) return;
 171
 172     M_IMGDATA->m_hasMask = mask;
 173 }
 174
 175 bool wxImage::HasMask() const
 176 {
 177     if (!Ok()) return FALSE;
 178
 179     return M_IMGDATA->m_hasMask;
 180 }
 181
 182 int wxImage::GetWidth() const
 183 {
 184     return (M_IMGDATA ? M_IMGDATA->m_width : 0);
 185 }
 186
 187 int wxImage::GetHeight() const
 188 {
 189     return (M_IMGDATA ? M_IMGDATA->m_height : 0);
 190 }
 191
 192 bool wxImage::LoadFile( const wxString& filename, long type )
 193 {
 194     UnRef();
 195
 196     if (!wxFileExists(filename))
 197     {
 198         wxLogWarning( "Image file does not exist." );
 199
 200         return FALSE;
 201     }
 202
 203     m_refData = new wxImageRefData;
 204
 205     wxImageHandler *handler = FindHandler(type);
 206
 207     if (handler == NULL)
 208     {
 209         wxLogWarning( "No image handler for type %d defined.", type );
 210
 211         return FALSE;
 212     }
 213
 214     return handler->LoadFile( this, filename );
 215 }
 216
 217 bool wxImage::SaveFile( const wxString& filename, int type )
 218 {
 219     wxImageHandler *handler = FindHandler(type);
 220
 221     if (handler == NULL)
 222     {
 223       wxLogWarning( "No image handler for type %d defined.", type );
 224
 225       return FALSE;
 226     }
 227
 228     return handler->SaveFile( this, filename );
 229 }
 230
 231 void wxImage::AddHandler( wxImageHandler *handler )
 232 {
 233     sm_handlers.Append( handler );
 234 }
 235
 236 void wxImage::InsertHandler( wxImageHandler *handler )
 237 {
 238     sm_handlers.Insert( handler );
 239 }
 240
 241 bool wxImage::RemoveHandler( const wxString& name )
 242 {
 243     wxImageHandler *handler = FindHandler(name);
 244     if (handler)
 245     {
 246         sm_handlers.DeleteObject(handler);
 247         return TRUE;
 248     }
 249     else
 250         return FALSE;
 251 }
 252
 253 wxImageHandler *wxImage::FindHandler( const wxString& name )
 254 {
 255     wxNode *node = sm_handlers.First();
 256     while (node)
 257     {
 258         wxImageHandler *handler = (wxImageHandler*)node->Data();
 259         if (handler->GetName() == name) return handler;
 260         node = node->Next();
 261     }
 262     return (wxImageHandler *)NULL;
 263 }
 264
 265 wxImageHandler *wxImage::FindHandler( const wxString& extension, long bitmapType )
 266 {
 267     wxNode *node = sm_handlers.First();
 268     while (node)
 269     {
 270         wxImageHandler *handler = (wxImageHandler*)node->Data();
 271         if ( handler->GetExtension() == extension &&
 272             (bitmapType == -1 || handler->GetType() == bitmapType) )
 273         return handler;
 274         node = node->Next();
 275     }
 276     return (wxImageHandler*)NULL;
 277 }
 278
 279 wxImageHandler *wxImage::FindHandler( long bitmapType )
 280 {
 281     wxNode *node = sm_handlers.First();
 282     while (node)
 283     {
 284         wxImageHandler *handler = (wxImageHandler *)node->Data();
 285         if (handler->GetType() == bitmapType) return handler;
 286         node = node->Next();
 287     }
 288     return NULL;
 289 }
 290
 291 void wxImage::InitStandardHandlers()
 292 {
 293     AddHandler( new wxBMPHandler );
 294     AddHandler( new wxPNGHandler );
 295 }
 296
 297 void wxImage::CleanUpHandlers()
 298 {
 299     wxNode *node = sm_handlers.First();
 300     while (node)
 301     {
 302         wxImageHandler *handler = (wxImageHandler *)node->Data();
 303         wxNode *next = node->Next();
 304         delete handler;
 305         delete node;
 306         node = next;
 307     }
 308 }
 309
 310 //-----------------------------------------------------------------------------
 311 // wxImageHandler
 312 //-----------------------------------------------------------------------------
 313
 314 #if !USE_SHARED_LIBRARIES
 315 IMPLEMENT_DYNAMIC_CLASS(wxImageHandler,wxObject)
 316 #endif
 317
 318 bool wxImageHandler::LoadFile( wxImage *WXUNUSED(image), const wxString& WXUNUSED(name) )
 319 {
 320     return FALSE;
 321 }
 322
 323 bool wxImageHandler::SaveFile( wxImage *WXUNUSED(image), const wxString& WXUNUSED(name) )
 324 {
 325     return FALSE;
 326 }
 327
 328 //-----------------------------------------------------------------------------
 329 // wxPNGHandler
 330 //-----------------------------------------------------------------------------
 331
 332 #if !USE_SHARED_LIBRARIES
 333 IMPLEMENT_DYNAMIC_CLASS(wxPNGHandler,wxImageHandler)
 334 #endif
 335
 336 bool wxPNGHandler::LoadFile( wxImage *image, const wxString& name )
 337 {
 338    FILE               *f;
 339    png_structp         png_ptr;
 340    png_infop           info_ptr;
 341    unsigned char      *ptr, **lines, *ptr2;
 342    int                 transp,bit_depth,color_type,interlace_type;
 343    png_uint_32         width, height;
 344    unsigned int        i;
 345
 346    image->Destroy();
 347
 348    transp = 0;
 349    png_ptr = png_create_read_struct( PNG_LIBPNG_VER_STRING, NULL, NULL, NULL );
 350    if (!png_ptr) return FALSE;
 351
 352    info_ptr = png_create_info_struct( png_ptr );
 353    if (!info_ptr)
 354    {
 355      png_destroy_read_struct( &png_ptr, NULL, NULL );
 356      return FALSE;
 357    }
 358
 359    if (setjmp(png_ptr->jmpbuf))
 360    {
 361      png_destroy_read_struct( &png_ptr, &info_ptr, NULL );
 362      return FALSE;
 363    }
 364
 365    if (info_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
 366    {
 367      png_destroy_read_struct( &png_ptr, &info_ptr, NULL );
 368      return FALSE;
 369    }
 370
 371    f = fopen( name, "rb" );
 372    png_init_io( png_ptr, f );
 373
 374    png_read_info( png_ptr, info_ptr );
 375    png_get_IHDR( png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, &interlace_type, NULL, NULL );
 376
 377    if (color_type == PNG_COLOR_TYPE_PALETTE) png_set_expand( png_ptr );
 378
 379    png_set_strip_16( png_ptr );
 380    png_set_packing( png_ptr );
 381    if (png_get_valid( png_ptr, info_ptr, PNG_INFO_tRNS)) png_set_expand( png_ptr );
 382    png_set_filler( png_ptr, 0xff, PNG_FILLER_AFTER );
 383
 384    image->Create( width, height );
 385
 386    if (!image->Ok())
 387    {
 388      png_destroy_read_struct( &png_ptr, &info_ptr, NULL );
 389      return FALSE;
 390    }
 391
 392    lines = (unsigned char **)malloc( height * sizeof(unsigned char *) );
 393    if (lines == NULL)
 394    {
 395      image->Destroy();
 396      png_destroy_read_struct( &png_ptr, &info_ptr, NULL );
 397      return FALSE;
 398    }
 399
 400    for (i = 0; i < height; i++)
 401    {
 402      if ((lines[i] = (unsigned char *)malloc(width * (sizeof(unsigned char) * 4))) == NULL)
 403      {
 404        image->Destroy();
 405        for (unsigned int n = 0; n < i; n++) free( lines[n] );
 406        free( lines );
 407        png_destroy_read_struct( &png_ptr, &info_ptr, NULL );
 408        return FALSE;
 409      }
 410   }
 411
 412    png_read_image( png_ptr, lines );
 413    png_destroy_read_struct( &png_ptr, &info_ptr, NULL );
 414    ptr = image->GetData();
 415    if ((color_type == PNG_COLOR_TYPE_GRAY) ||
 416        (color_type == PNG_COLOR_TYPE_GRAY_ALPHA))
 417      {
 418         for (unsigned int y = 0; y < height; y++)
 419           {
 420              ptr2 = lines[y];
 421              for (unsigned int x = 0; x < width; x++)
 422                {
 423                   unsigned char r = *ptr2++;
 424                   unsigned char a = *ptr2++;
 425                   if (a < 128)
 426                     {
 427                        *ptr++ = 255;
 428                        *ptr++ = 0;
 429                        *ptr++ = 255;
 430                        transp = 1;
 431                     }
 432                   else
 433                     {
 434                        *ptr++ = r;
 435                        *ptr++ = r;
 436                        *ptr++ = r;
 437                     }
 438                }
 439           }
 440      }
 441    else
 442      {
 443         for (unsigned int y = 0; y < height; y++)
 444           {
 445              ptr2 = lines[y];
 446              for (unsigned int x = 0; x < width; x++)
 447                {
 448                   unsigned char r = *ptr2++;
 449                   unsigned char g = *ptr2++;
 450                   unsigned char b = *ptr2++;
 451                   unsigned char a = *ptr2++;
 452                   if (a < 128)
 453                     {
 454                        *ptr++ = 255;
 455                        *ptr++ = 0;
 456                        *ptr++ = 255;
 457                        transp = 1;
 458                     }
 459                   else
 460                     {
 461                        if ((r == 255) && (g == 0) && (b == 255)) r = 254;
 462                        *ptr++ = r;
 463                        *ptr++ = g;
 464                        *ptr++ = b;
 465                     }
 466                }
 467           }
 468      }
 469    for (i = 0; i < height; i++) free( lines[i] );
 470    free( lines );
 471    if (transp)
 472      image->SetMaskColour( 255, 0, 255 );
 473    else
 474      image->SetMask( FALSE );
 475
 476    return TRUE;
 477 }
 478
 479
 480 bool wxPNGHandler::SaveFile( wxImage *image, const wxString& name )
 481 {
 482   FILE *f = fopen( name, "wb" );
 483   if (f)
 484   {
 485     png_structp png_ptr = png_create_write_struct( PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
 486     if (!png_ptr)
 487     {
 488       fclose( f );
 489       return FALSE;
 490     }
 491
 492     png_infop info_ptr = png_create_info_struct(png_ptr);
 493     if (info_ptr == NULL)
 494     {
 495       fclose(f);
 496       png_destroy_write_struct( &png_ptr, (png_infopp)NULL );
 497       return FALSE;
 498     }
 499
 500     if (setjmp(png_ptr->jmpbuf))
 501     {
 502       fclose( f );
 503       png_destroy_write_struct( &png_ptr, (png_infopp)NULL );
 504       return FALSE;
 505     }
 506
 507     png_init_io( png_ptr, f );
 508     png_set_IHDR( png_ptr, info_ptr, image->GetWidth(), image->GetHeight(), 8,
 509                   PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE,
 510                   PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
 511
 512     png_color_8 sig_bit;
 513     sig_bit.red = 8;
 514     sig_bit.green = 8;
 515     sig_bit.blue = 8;
 516     sig_bit.alpha = 8;
 517     png_set_sBIT( png_ptr, info_ptr, &sig_bit );
 518     png_write_info( png_ptr, info_ptr );
 519     png_set_shift( png_ptr, &sig_bit );
 520     png_set_packing( png_ptr );
 521
 522     unsigned char *data = (unsigned char *)malloc( image->GetWidth()*4 );
 523     if (!data)
 524     {
 525       fclose( f );
 526       png_destroy_write_struct( &png_ptr, (png_infopp)NULL );
 527       return FALSE;
 528     }
 529
 530     for (int y = 0; y < image->GetHeight(); y++)
 531     {
 532       unsigned char *ptr = image->GetData() + (y * image->GetWidth() * 3);
 533       for (int x = 0; x < image->GetWidth(); x++)
 534       {
 535         data[(x << 2) + 0] = *ptr++;
 536         data[(x << 2) + 1] = *ptr++;
 537         data[(x << 2) + 2] = *ptr++;
 538         if ((data[(x << 2) + 0] == image->GetMaskRed()) &&
 539             (data[(x << 2) + 1] == image->GetMaskGreen()) &&
 540             (data[(x << 2) + 2] == image->GetMaskBlue()))
 541           data[(x << 2) + 3] = 0;
 542         else
 543           data[(x << 2) + 3] = 255;
 544       }
 545       png_bytep row_ptr = data;
 546       png_write_rows( png_ptr, &row_ptr, 1 );
 547     }
 548     free(data);
 549     png_write_end( png_ptr, info_ptr );
 550     png_destroy_write_struct( &png_ptr, (png_infopp)NULL );
 551
 552     fclose(f);
 553   }
 554   return TRUE;
 555 }
 556
 557 //-----------------------------------------------------------------------------
 558 // wxBMPHandler
 559 //-----------------------------------------------------------------------------
 560
 561 #if !USE_SHARED_LIBRARIES
 562 IMPLEMENT_DYNAMIC_CLASS(wxBMPHandler,wxImageHandler)
 563 #endif
 564
 565 bool wxBMPHandler::LoadFile( wxImage *image, const wxString& name )
 566 {
 567    FILE               *file;
 568    unsigned char      *data, *ptr;
 569    int                 done, i, bpp, planes, comp, ncolors, line, column,
 570                        linesize, linepos, rshift = 0, gshift = 0, bshift = 0;
 571    unsigned char       byte;
 572    short int           word;
 573    long int            dbuf[4], dword, rmask = 0, gmask = 0, bmask = 0, offset,
 574                        size;
 575    signed char         bbuf[4];
 576    struct _cmap
 577      {
 578         unsigned char       r, g, b;
 579      }
 580                       *cmap = NULL;
 581 #ifndef BI_RGB
 582 #define BI_RGB       0
 583 #define BI_RLE8      1
 584 #define BI_RLE4      2
 585 #define BI_BITFIELDS 3
 586 #endif
 587
 588   image->Destroy();
 589
 590    file = fopen(name, "r");
 591    if (!file)
 592       return NULL;
 593
 594    done = 0;
 595    /*
 596     * Reading the bmp header
 597     */
 598
 599    fread(&bbuf, 1, 2, file);
 600
 601    fread(dbuf, 4, 4, file);
 602
 603    size = dbuf[0];
 604    offset = dbuf[2];
 605
 606    fread(dbuf, 4, 2, file);
 607    int width = (int)dbuf[0];
 608    int height = (int)dbuf[1];
 609    if (width > 32767)
 610      {
 611         fprintf(stderr, "IMLIB ERROR: Image width > 32767 pixels for file\n");
 612         fclose(file);
 613         return FALSE;
 614      }
 615    if (height > 32767)
 616      {
 617         fprintf(stderr, "IMLIB ERROR: Image height > 32767 pixels for file\n");
 618         fclose(file);
 619         return FALSE;
 620      }
 621    fread(&word, 2, 1, file);
 622    planes = (int)word;
 623    fread(&word, 2, 1, file);
 624    bpp = (int)word;
 625    if (bpp != 1 && bpp != 4 && bpp != 8 && bpp && 16 && bpp != 24 && bpp != 32)
 626      {
 627         fprintf(stderr, "IMLIB ERROR: unknown bitdepth in file\n");
 628         fclose(file);
 629         return FALSE;
 630      }
 631    fread(dbuf, 4, 4, file);
 632    comp = (int)dbuf[0];
 633    if (comp != BI_RGB && comp != BI_RLE4 && comp != BI_RLE8 && comp != BI_BITFIELDS)
 634      {
 635         fprintf(stderr, "IMLIB ERROR: unknown encoding in Windows BMP file\n");
 636         fclose(file);
 637         return FALSE;
 638      }
 639    fread(dbuf, 4, 2, file);
 640    ncolors = (int)dbuf[0];
 641    if (ncolors == 0)
 642       ncolors = 1 << bpp;
 643    /* some more sanity checks */
 644    if (((comp == BI_RLE4) && (bpp != 4)) || ((comp == BI_RLE8) && (bpp != 8)) || ((comp == BI_BITFIELDS) && (bpp != 16 && bpp != 32)))
 645      {
 646         fprintf(stderr, "IMLIB ERROR: encoding of BMP doesn't match bitdepth\n");
 647         fclose(file);
 648         return FALSE;
 649      }
 650    if (bpp < 16)
 651      {
 652         cmap = (struct _cmap *)malloc(sizeof(struct _cmap) * ncolors);
 653
 654         if (!cmap)
 655           {
 656              fprintf(stderr, "IMLIB ERROR: Cannot allocate RAM for color map in BMP file\n");
 657              fclose(file);
 658              return FALSE;
 659           }
 660      }
 661    else
 662       cmap = NULL;
 663
 664    image->Create( width, height );
 665    ptr = image->GetData();
 666    if (!ptr)
 667      {
 668         fprintf(stderr, "IMLIB ERROR: Cannot allocate RAM for RGB data in file\n");
 669         fclose(file);
 670         if (cmap)
 671            free(cmap);
 672         return FALSE;
 673      }
 674
 675    /*
 676     * Reading the palette, if it exists.
 677     */
 678    if (bpp < 16 && ncolors != 0)
 679      {
 680         for (i = 0; i < ncolors; i++)
 681           {
 682              fread(bbuf, 1, 4, file);
 683              cmap[i].b = bbuf[0];
 684              cmap[i].g = bbuf[1];
 685              cmap[i].r = bbuf[2];
 686           }
 687      }
 688    else if (bpp == 16 || bpp == 32)
 689      {
 690         if (comp == BI_BITFIELDS)
 691           {
 692              int                 bit = 0;
 693
 694              fread(dbuf, 4, 3, file);
 695              bmask = dbuf[0];
 696              gmask = dbuf[1];
 697              rmask = dbuf[2];
 698              /* find shift amount.. ugly, but i can't think of a better way */
 699              for (bit = 0; bit < bpp; bit++)
 700                {
 701                   if (bmask & (1 << bit))
 702                      bshift = bit;
 703                   if (gmask & (1 << bit))
 704                      gshift = bit;
 705                   if (rmask & (1 << bit))
 706                      rshift = bit;
 707                }
 708           }
 709         else if (bpp == 16)
 710           {
 711              rmask = 0x7C00;
 712              gmask = 0x03E0;
 713              bmask = 0x001F;
 714              rshift = 10;
 715              gshift = 5;
 716              bshift = 0;
 717           }
 718         else if (bpp == 32)
 719           {
 720              rmask = 0x00FF0000;
 721              gmask = 0x0000FF00;
 722              bmask = 0x000000FF;
 723              rshift = 16;
 724              gshift = 8;
 725              bshift = 0;
 726           }
 727      }
 728
 729    /*
 730     * REading the image data
 731     */
 732    fseek(file, offset, SEEK_SET);
 733    data = ptr;
 734
 735    /* set the whole image to the background color */
 736    if (bpp < 16 && (comp == BI_RLE4 || comp == BI_RLE8))
 737      {
 738         for (i = 0; i < width * height; i++)
 739           {
 740              *ptr++ = cmap[0].r;
 741              *ptr++ = cmap[0].g;
 742              *ptr++ = cmap[0].b;
 743           }
 744         ptr = data;
 745      }
 746    line = 0;
 747    column = 0;
 748 #define poffset (line * width * 3 + column * 3)
 749
 750    /*
 751     * BMPs are stored upside down... hmmmmmmmmmm....
 752     */
 753
 754    linesize = ((width * bpp + 31) / 32) * 4;
 755    for (line = (height - 1); line >= 0; line--)
 756      {
 757         linepos = 0;
 758         for (column = 0; column < width;)
 759           {
 760              if (bpp < 16)
 761                {
 762                   int                 index;
 763
 764                   linepos++;
 765                   byte = getc(file);
 766                   if (bpp == 1)
 767                     {
 768                        int                 bit = 0;
 769
 770                        for (bit = 0; bit < 8; bit++)
 771                          {
 772                             index = ((byte & (0x80 >> bit)) ? 1 : 0);
 773                             ptr[poffset] = cmap[index].r;
 774                             ptr[poffset + 1] = cmap[index].g;
 775                             ptr[poffset + 2] = cmap[index].b;
 776                             column++;
 777                          }
 778                     }
 779                   else if (bpp == 4)
 780                     {
 781                        if (comp == BI_RLE4)
 782                          {
 783                             fprintf(stderr, "can't deal with 4bit encoded yet.\n");
 784                             image->Destroy();
 785                             free(cmap);
 786                             return FALSE;
 787                          }
 788                        else
 789                          {
 790                             int                 nibble = 0;
 791
 792                             for (nibble = 0; nibble < 2; nibble++)
 793                               {
 794                                  index = ((byte & (0xF0 >> nibble * 4)) >> (!nibble * 4));
 795                                  if (index >= 16)
 796                                     index = 15;
 797                                  ptr[poffset] = cmap[index].r;
 798                                  ptr[poffset + 1] = cmap[index].g;
 799                                  ptr[poffset + 2] = cmap[index].b;
 800                                  column++;
 801                               }
 802                          }
 803                     }
 804                   else if (bpp == 8)
 805                     {
 806                        if (comp == BI_RLE8)
 807                          {
 808                             unsigned char       first;
 809
 810                             first = byte;
 811                             byte = getc(file);
 812                             if (first == 0)
 813                               {
 814                                  if (byte == 0)
 815                                    {
 816 /*                                    column = width; */
 817                                    }
 818                                  else if (byte == 1)
 819                                    {
 820                                       column = width;
 821                                       line = -1;
 822                                    }
 823                                  else if (byte == 2)
 824                                    {
 825                                       byte = getc(file);
 826                                       column += byte;
 827                                       linepos = column * bpp / 8;
 828                                       byte = getc(file);
 829                                       line += byte;
 830                                    }
 831                                  else
 832                                    {
 833                                       int                 absolute = byte;
 834
 835                                       for (i = 0; i < absolute; i++)
 836                                         {
 837                                            linepos++;
 838                                            byte = getc(file);
 839                                            ptr[poffset] = cmap[byte].r;
 840                                            ptr[poffset + 1] = cmap[byte].g;
 841                                            ptr[poffset + 2] = cmap[byte].b;
 842                                            column++;
 843                                         }
 844                                       if (absolute & 0x01)
 845                                          byte = getc(file);
 846                                    }
 847                               }
 848                             else
 849                               {
 850                                  for (i = 0; i < first; i++)
 851                                    {
 852                                       ptr[poffset] = cmap[byte].r;
 853                                       ptr[poffset + 1] = cmap[byte].g;
 854                                       ptr[poffset + 2] = cmap[byte].b;
 855                                       column++;
 856                                       linepos++;
 857                                    }
 858                               }
 859                          }
 860                        else
 861                          {
 862                             ptr[poffset] = cmap[byte].r;
 863                             ptr[poffset + 1] = cmap[byte].g;
 864                             ptr[poffset + 2] = cmap[byte].b;
 865                             column++;
 866                             linepos += size;
 867                          }
 868                     }
 869                }
 870              else if (bpp == 24)
 871                {
 872                   linepos += fread(&bbuf, 1, 3, file);
 873                   ptr[poffset] = (unsigned char)bbuf[2];
 874                   ptr[poffset + 1] = (unsigned char)bbuf[1];
 875                   ptr[poffset + 2] = (unsigned char)bbuf[0];
 876                   column++;
 877                }
 878              else if (bpp == 16)
 879                {
 880                   unsigned char       temp;
 881
 882                   linepos += fread(&word, 2, 1, file);
 883                   temp = (word & rmask) >> rshift;
 884                   ptr[poffset] = temp;
 885                   temp = (word & gmask) >> gshift;
 886                   ptr[poffset + 1] = temp;
 887                   temp = (word & bmask) >> gshift;
 888                   ptr[poffset + 2] = temp;
 889                   column++;
 890                }
 891              else
 892                {
 893                   unsigned char       temp;
 894
 895                   linepos += fread(&dword, 4, 1, file);
 896                   temp = (dword & rmask) >> rshift;
 897                   ptr[poffset] = temp;
 898                   temp = (dword & gmask) >> gshift;
 899                   ptr[poffset + 1] = temp;
 900                   temp = (dword & bmask) >> bshift;
 901                   ptr[poffset + 2] = temp;
 902                   column++;
 903                }
 904           }
 905         while ((linepos < linesize) && (comp != 1) && (comp != 2))
 906           {
 907              int                 temp = fread(&byte, 1, 1, file);
 908
 909              linepos += temp;
 910              if (!temp)
 911                 break;
 912           }
 913      }
 914    if (cmap) free(cmap);
 915
 916    image->SetMask( FALSE );
 917
 918    fclose(file);
 919    return TRUE;
 920 }
 921