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/defs.h"
  22
  23 #if wxUSE_IMAGE
  24
  25 #include "wx/image.h"
  26 #include "wx/bitmap.h"
  27 #include "wx/debug.h"
  28 #include "wx/log.h"
  29 #include "wx/app.h"
  30 #include "wx/filefn.h"
  31 #include "wx/wfstream.h"
  32 #include "wx/intl.h"
  33 #include "wx/module.h"
  34 #include "wx/hash.h"
  35
  36 // For memcpy
  37 #include <string.h>
  38 #include <math.h>
  39
  40 #ifdef __SALFORDC__
  41     #undef FAR
  42 #endif
  43
  44
  45 //-----------------------------------------------------------------------------
  46 // wxImage
  47 //-----------------------------------------------------------------------------
  48
  49 class wxImageRefData: public wxObjectRefData
  50 {
  51 public:
  52     wxImageRefData();
  53     virtual ~wxImageRefData();
  54
  55     int             m_width;
  56     int             m_height;
  57     unsigned char  *m_data;
  58
  59     bool            m_hasMask;
  60     unsigned char   m_maskRed,m_maskGreen,m_maskBlue;
  61
  62     // alpha channel data, may be NULL for the formats without alpha support
  63     unsigned char  *m_alpha;
  64
  65     bool            m_ok;
  66     bool            m_static;
  67
  68 #if wxUSE_PALETTE
  69     wxPalette       m_palette;
  70 #endif // wxUSE_PALETTE
  71
  72     wxArrayString   m_optionNames;
  73     wxArrayString   m_optionValues;
  74
  75     DECLARE_NO_COPY_CLASS(wxImageRefData)
  76 };
  77
  78 wxImageRefData::wxImageRefData()
  79 {
  80     m_width = 0;
  81     m_height = 0;
  82     m_data =
  83     m_alpha = (unsigned char *) NULL;
  84
  85     m_maskRed = 0;
  86     m_maskGreen = 0;
  87     m_maskBlue = 0;
  88     m_hasMask = FALSE;
  89
  90     m_ok = FALSE;
  91     m_static = FALSE;
  92 }
  93
  94 wxImageRefData::~wxImageRefData()
  95 {
  96     if ( !m_static )
  97         free( m_data );
  98
  99     free(m_alpha);
 100 }
 101
 102 wxList wxImage::sm_handlers;
 103
 104 wxImage wxNullImage;
 105
 106 //-----------------------------------------------------------------------------
 107
 108 #define M_IMGDATA ((wxImageRefData *)m_refData)
 109
 110 IMPLEMENT_DYNAMIC_CLASS(wxImage, wxObject)
 111
 112 wxImage::wxImage()
 113 {
 114 }
 115
 116 wxImage::wxImage( int width, int height, bool clear )
 117 {
 118     Create( width, height, clear );
 119 }
 120
 121 wxImage::wxImage( int width, int height, unsigned char* data, bool static_data )
 122 {
 123     Create( width, height, data, static_data );
 124 }
 125
 126 wxImage::wxImage( const wxString& name, long type, int index )
 127 {
 128     LoadFile( name, type, index );
 129 }
 130
 131 wxImage::wxImage( const wxString& name, const wxString& mimetype, int index )
 132 {
 133     LoadFile( name, mimetype, index );
 134 }
 135
 136 #if wxUSE_STREAMS
 137 wxImage::wxImage( wxInputStream& stream, long type, int index )
 138 {
 139     LoadFile( stream, type, index );
 140 }
 141
 142 wxImage::wxImage( wxInputStream& stream, const wxString& mimetype, int index )
 143 {
 144     LoadFile( stream, mimetype, index );
 145 }
 146 #endif // wxUSE_STREAMS
 147
 148 wxImage::wxImage( const wxImage& image )
 149     : wxObject()
 150 {
 151     Ref(image);
 152 }
 153
 154 wxImage::wxImage( const wxImage* image )
 155 {
 156     if (image) Ref(*image);
 157 }
 158
 159 void wxImage::Create( int width, int height, bool clear )
 160 {
 161     UnRef();
 162
 163     m_refData = new wxImageRefData();
 164
 165     M_IMGDATA->m_data = (unsigned char *) malloc( width*height*3 );
 166     if (M_IMGDATA->m_data)
 167     {
 168         if (clear) memset(M_IMGDATA->m_data, 0, width*height*3);
 169
 170         M_IMGDATA->m_width = width;
 171         M_IMGDATA->m_height = height;
 172         M_IMGDATA->m_ok = TRUE;
 173     }
 174     else
 175     {
 176         UnRef();
 177     }
 178 }
 179
 180 void wxImage::Create( int width, int height, unsigned char* data, bool static_data )
 181 {
 182     UnRef();
 183
 184     m_refData = new wxImageRefData();
 185
 186     M_IMGDATA->m_data = data;
 187     if (M_IMGDATA->m_data)
 188     {
 189         M_IMGDATA->m_width = width;
 190         M_IMGDATA->m_height = height;
 191         M_IMGDATA->m_ok = TRUE;
 192         M_IMGDATA->m_static = static_data;
 193     }
 194     else
 195     {
 196         UnRef();
 197     }
 198 }
 199
 200 void wxImage::Destroy()
 201 {
 202     UnRef();
 203 }
 204
 205 wxImage wxImage::Copy() const
 206 {
 207     wxImage image;
 208
 209     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 210
 211     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 212
 213     unsigned char *data = image.GetData();
 214
 215     wxCHECK_MSG( data, image, wxT("unable to create image") );
 216
 217     image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 218     image.SetMask( M_IMGDATA->m_hasMask );
 219
 220     memcpy( data, GetData(), M_IMGDATA->m_width*M_IMGDATA->m_height*3 );
 221
 222     return image;
 223 }
 224
 225 wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const
 226 {
 227     if( xFactor == 1 && yFactor == 1 )
 228         return Copy() ;
 229
 230     wxImage image;
 231
 232     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 233
 234     // can't scale to/from 0 size
 235     wxCHECK_MSG( (xFactor > 0) && (yFactor > 0), image,
 236                  wxT("invalid new image size") );
 237
 238     long old_height = M_IMGDATA->m_height,
 239          old_width  = M_IMGDATA->m_width;
 240
 241     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 242                  wxT("invalid old image size") );
 243
 244     long width = old_width / xFactor ;
 245     long height = old_height / yFactor ;
 246
 247     image.Create( width, height, false );
 248
 249     char unsigned *data = image.GetData();
 250
 251     wxCHECK_MSG( data, image, wxT("unable to create image") );
 252
 253     bool hasMask = false ;
 254     unsigned char maskRed = 0;
 255     unsigned char maskGreen = 0;
 256     unsigned char maskBlue =0 ;
 257     if (M_IMGDATA->m_hasMask)
 258     {
 259         hasMask = true ;
 260         maskRed = M_IMGDATA->m_maskRed;
 261         maskGreen = M_IMGDATA->m_maskGreen;
 262         maskBlue =M_IMGDATA->m_maskBlue ;
 263
 264         image.SetMaskColour( M_IMGDATA->m_maskRed,
 265                              M_IMGDATA->m_maskGreen,
 266                              M_IMGDATA->m_maskBlue );
 267     }
 268     char unsigned *source_data = M_IMGDATA->m_data;
 269     char unsigned *target_data = data;
 270
 271     for (long y = 0; y < height; y++)
 272     {
 273         for (long x = 0; x < width; x++)
 274         {
 275             unsigned long avgRed = 0 ;
 276             unsigned long avgGreen = 0;
 277             unsigned long avgBlue = 0;
 278             unsigned long counter = 0 ;
 279             // determine average
 280             for ( int y1 = 0 ; y1 < yFactor ; ++y1 )
 281             {
 282                 long y_offset = (y * yFactor + y1) * old_width;
 283                 for ( int x1 = 0 ; x1 < xFactor ; ++x1 )
 284                 {
 285                     unsigned char *pixel = source_data + 3 * ( y_offset + x * xFactor + x1 ) ;
 286                     unsigned char red = pixel[0] ;
 287                     unsigned char green = pixel[1] ;
 288                     unsigned char blue = pixel[2] ;
 289                     if ( !hasMask || red != maskRed || green != maskGreen || blue != maskBlue )
 290                     {
 291                         avgRed += red ;
 292                         avgGreen += green ;
 293                         avgBlue += blue ;
 294                         counter++ ;
 295                     }
 296                 }
 297             }
 298             if ( counter == 0 )
 299             {
 300                 *(target_data++) = M_IMGDATA->m_maskRed ;
 301                 *(target_data++) = M_IMGDATA->m_maskGreen ;
 302                 *(target_data++) = M_IMGDATA->m_maskBlue ;
 303             }
 304             else
 305             {
 306                 *(target_data++) = avgRed / counter ;
 307                 *(target_data++) = avgGreen / counter ;
 308                 *(target_data++) = avgBlue / counter ;
 309             }
 310         }
 311     }
 312
 313     // In case this is a cursor, make sure the hotspot is scalled accordingly:
 314     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
 315         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
 316                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X))/xFactor);
 317     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
 318         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
 319                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y))/yFactor);
 320
 321     return image;
 322 }
 323
 324 wxImage wxImage::Scale( int width, int height ) const
 325 {
 326     wxImage image;
 327
 328     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 329
 330     // can't scale to/from 0 size
 331     wxCHECK_MSG( (width > 0) && (height > 0), image,
 332                  wxT("invalid new image size") );
 333
 334     long old_height = M_IMGDATA->m_height,
 335          old_width  = M_IMGDATA->m_width;
 336     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 337                  wxT("invalid old image size") );
 338
 339     if ( old_width % width == 0 && old_width >= width &&
 340         old_height % height == 0 && old_height >= height )
 341     {
 342         return ShrinkBy( old_width / width , old_height / height ) ;
 343     }
 344     image.Create( width, height, false );
 345
 346     unsigned char *data = image.GetData();
 347
 348     wxCHECK_MSG( data, image, wxT("unable to create image") );
 349
 350     if (M_IMGDATA->m_hasMask)
 351     {
 352         image.SetMaskColour( M_IMGDATA->m_maskRed,
 353                              M_IMGDATA->m_maskGreen,
 354                              M_IMGDATA->m_maskBlue );
 355     }
 356
 357     unsigned char *source_data = M_IMGDATA->m_data;
 358     unsigned char *target_data = data;
 359
 360     long x_delta = (old_width<<16) / width;
 361     long y_delta = (old_height<<16) / height;
 362
 363     unsigned char* dest_pixel = target_data;
 364
 365     long y = 0;
 366     for ( long j = 0; j < height; j++ )
 367         {
 368         unsigned char* src_line = &source_data[(y>>16)*old_width*3];
 369
 370         long x = 0;
 371         for ( long i = 0; i < width; i++ )
 372         {
 373              unsigned char* src_pixel = &src_line[(x>>16)*3];
 374              dest_pixel[0] = src_pixel[0];
 375              dest_pixel[1] = src_pixel[1];
 376              dest_pixel[2] = src_pixel[2];
 377              dest_pixel += 3;
 378              x += x_delta;
 379         }
 380
 381         y += y_delta;
 382     }
 383
 384     // In case this is a cursor, make sure the hotspot is scalled accordingly:
 385     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
 386         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
 387                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X)*width)/old_width);
 388     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
 389         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
 390                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y)*height)/old_height);
 391
 392     return image;
 393 }
 394
 395 wxImage wxImage::Rotate90( bool clockwise ) const
 396 {
 397     wxImage image;
 398
 399     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 400
 401     image.Create( M_IMGDATA->m_height, M_IMGDATA->m_width, false );
 402
 403     unsigned char *data = image.GetData();
 404
 405     wxCHECK_MSG( data, image, wxT("unable to create image") );
 406
 407     if (M_IMGDATA->m_hasMask)
 408         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 409
 410     long height = M_IMGDATA->m_height;
 411     long width  = M_IMGDATA->m_width;
 412
 413     unsigned char *source_data = M_IMGDATA->m_data;
 414     unsigned char *target_data;
 415
 416     for (long j = 0; j < height; j++)
 417     {
 418         for (long i = 0; i < width; i++)
 419         {
 420             if (clockwise)
 421                 target_data = data + (((i+1)*height) - j - 1)*3;
 422             else
 423                 target_data = data + ((height*(width-1)) + j - (i*height))*3;
 424             memcpy( target_data, source_data, 3 );
 425             source_data += 3;
 426         }
 427     }
 428
 429     return image;
 430 }
 431
 432 wxImage wxImage::Mirror( bool horizontally ) const
 433 {
 434     wxImage image;
 435
 436     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 437
 438     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 439
 440     unsigned char *data = image.GetData();
 441
 442     wxCHECK_MSG( data, image, wxT("unable to create image") );
 443
 444     if (M_IMGDATA->m_hasMask)
 445         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 446
 447     long height = M_IMGDATA->m_height;
 448     long width  = M_IMGDATA->m_width;
 449
 450     unsigned char *source_data = M_IMGDATA->m_data;
 451     unsigned char *target_data;
 452
 453     if (horizontally)
 454     {
 455         for (long j = 0; j < height; j++)
 456         {
 457             data += width*3;
 458             target_data = data-3;
 459             for (long i = 0; i < width; i++)
 460             {
 461                 memcpy( target_data, source_data, 3 );
 462                 source_data += 3;
 463                 target_data -= 3;
 464             }
 465         }
 466     }
 467     else
 468     {
 469         for (long i = 0; i < height; i++)
 470         {
 471             target_data = data + 3*width*(height-1-i);
 472             memcpy( target_data, source_data, (size_t)3*width );
 473             source_data += 3*width;
 474         }
 475     }
 476
 477     return image;
 478 }
 479
 480 wxImage wxImage::GetSubImage( const wxRect &rect ) const
 481 {
 482     wxImage image;
 483
 484     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 485
 486     wxCHECK_MSG( (rect.GetLeft()>=0) && (rect.GetTop()>=0) && (rect.GetRight()<=GetWidth()) && (rect.GetBottom()<=GetHeight()),
 487                  image, wxT("invalid subimage size") );
 488
 489     int subwidth=rect.GetWidth();
 490     const int subheight=rect.GetHeight();
 491
 492     image.Create( subwidth, subheight, false );
 493
 494     unsigned char *subdata = image.GetData(), *data=GetData();
 495
 496     wxCHECK_MSG( subdata, image, wxT("unable to create image") );
 497
 498     if (M_IMGDATA->m_hasMask)
 499         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 500
 501     const int subleft=3*rect.GetLeft();
 502     const int width=3*GetWidth();
 503     subwidth*=3;
 504
 505     data+=rect.GetTop()*width+subleft;
 506
 507     for (long j = 0; j < subheight; ++j)
 508     {
 509         memcpy( subdata, data, subwidth);
 510         subdata+=subwidth;
 511         data+=width;
 512     }
 513
 514     return image;
 515 }
 516
 517 void wxImage::Paste( const wxImage &image, int x, int y )
 518 {
 519     wxCHECK_RET( Ok(), wxT("invalid image") );
 520     wxCHECK_RET( image.Ok(), wxT("invalid image") );
 521
 522     int xx = 0;
 523     int yy = 0;
 524     int width = image.GetWidth();
 525     int height = image.GetHeight();
 526
 527     if (x < 0)
 528     {
 529         xx = -x;
 530         width += x;
 531     }
 532     if (y < 0)
 533     {
 534         yy = -y;
 535         height += y;
 536     }
 537
 538     if ((x+xx)+width > M_IMGDATA->m_width)
 539         width = M_IMGDATA->m_width - (x+xx);
 540     if ((y+yy)+height > M_IMGDATA->m_height)
 541         height = M_IMGDATA->m_height - (y+yy);
 542
 543     if (width < 1) return;
 544     if (height < 1) return;
 545
 546     if ((!HasMask() && !image.HasMask()) ||
 547        ((HasMask() && image.HasMask() &&
 548          (GetMaskRed()==image.GetMaskRed()) &&
 549          (GetMaskGreen()==image.GetMaskGreen()) &&
 550          (GetMaskBlue()==image.GetMaskBlue()))))
 551     {
 552         width *= 3;
 553         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 554         int source_step = image.GetWidth()*3;
 555
 556         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 557         int target_step = M_IMGDATA->m_width*3;
 558         for (int j = 0; j < height; j++)
 559         {
 560             memcpy( target_data, source_data, width );
 561             source_data += source_step;
 562             target_data += target_step;
 563         }
 564         return;
 565     }
 566
 567     if (!HasMask() && image.HasMask())
 568     {
 569         unsigned char r = image.GetMaskRed();
 570         unsigned char g = image.GetMaskGreen();
 571         unsigned char b = image.GetMaskBlue();
 572
 573         width *= 3;
 574         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 575         int source_step = image.GetWidth()*3;
 576
 577         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 578         int target_step = M_IMGDATA->m_width*3;
 579
 580         for (int j = 0; j < height; j++)
 581         {
 582             for (int i = 0; i < width; i+=3)
 583             {
 584                 if ((source_data[i]   != r) &&
 585                     (source_data[i+1] != g) &&
 586                     (source_data[i+2] != b))
 587                 {
 588                     memcpy( target_data+i, source_data+i, 3 );
 589                 }
 590             }
 591             source_data += source_step;
 592             target_data += target_step;
 593         }
 594     }
 595 }
 596
 597 void wxImage::Replace( unsigned char r1, unsigned char g1, unsigned char b1,
 598                        unsigned char r2, unsigned char g2, unsigned char b2 )
 599 {
 600     wxCHECK_RET( Ok(), wxT("invalid image") );
 601
 602     unsigned char *data = GetData();
 603
 604     const int w = GetWidth();
 605     const int h = GetHeight();
 606
 607     for (int j = 0; j < h; j++)
 608         for (int i = 0; i < w; i++)
 609         {
 610             if ((data[0] == r1) && (data[1] == g1) && (data[2] == b1))
 611             {
 612                 data[0] = r2;
 613                 data[1] = g2;
 614                 data[2] = b2;
 615             }
 616             data += 3;
 617         }
 618 }
 619
 620 wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const
 621 {
 622     wxImage image;
 623
 624     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 625
 626     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 627
 628     unsigned char *data = image.GetData();
 629
 630     wxCHECK_MSG( data, image, wxT("unable to create image") );
 631
 632     if (M_IMGDATA->m_hasMask)
 633     {
 634         if (M_IMGDATA->m_maskRed == r && M_IMGDATA->m_maskGreen == g &&
 635                                          M_IMGDATA->m_maskBlue == b)
 636             image.SetMaskColour( 255, 255, 255 );
 637         else
 638             image.SetMaskColour( 0, 0, 0 );
 639     }
 640
 641     long size = M_IMGDATA->m_height * M_IMGDATA->m_width;
 642
 643     unsigned char *srcd = M_IMGDATA->m_data;
 644     unsigned char *tard = image.GetData();
 645
 646     for ( long i = 0; i < size; i++, srcd += 3, tard += 3 )
 647     {
 648         if (srcd[0] == r && srcd[1] == g && srcd[2] == b)
 649             tard[0] = tard[1] = tard[2] = 255;
 650         else
 651             tard[0] = tard[1] = tard[2] = 0;
 652     }
 653
 654     return image;
 655 }
 656
 657 void wxImage::SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b )
 658 {
 659     wxCHECK_RET( Ok(), wxT("invalid image") );
 660
 661     int w = M_IMGDATA->m_width;
 662     int h = M_IMGDATA->m_height;
 663
 664     wxCHECK_RET( (x>=0) && (y>=0) && (x<w) && (y<h), wxT("invalid image index") );
 665
 666     long pos = (y * w + x) * 3;
 667
 668     M_IMGDATA->m_data[ pos   ] = r;
 669     M_IMGDATA->m_data[ pos+1 ] = g;
 670     M_IMGDATA->m_data[ pos+2 ] = b;
 671 }
 672
 673 unsigned char wxImage::GetRed( int x, int y ) const
 674 {
 675     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 676
 677     int w = M_IMGDATA->m_width;
 678     int h = M_IMGDATA->m_height;
 679
 680     wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
 681
 682     long pos = (y * w + x) * 3;
 683
 684     return M_IMGDATA->m_data[pos];
 685 }
 686
 687 unsigned char wxImage::GetGreen( int x, int y ) const
 688 {
 689     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 690
 691     int w = M_IMGDATA->m_width;
 692     int h = M_IMGDATA->m_height;
 693
 694     wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
 695
 696     long pos = (y * w + x) * 3;
 697
 698     return M_IMGDATA->m_data[pos+1];
 699 }
 700
 701 unsigned char wxImage::GetBlue( int x, int y ) const
 702 {
 703     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 704
 705     int w = M_IMGDATA->m_width;
 706     int h = M_IMGDATA->m_height;
 707
 708     wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
 709
 710     long pos = (y * w + x) * 3;
 711
 712     return M_IMGDATA->m_data[pos+2];
 713 }
 714
 715 bool wxImage::Ok() const
 716 {
 717     // image of 0 width or height can't be considered ok - at least because it
 718     // causes crashes in ConvertToBitmap() if we don't catch it in time
 719     wxImageRefData *data = M_IMGDATA;
 720     return data && data->m_ok && data->m_width && data->m_height;
 721 }
 722
 723 unsigned char *wxImage::GetData() const
 724 {
 725     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
 726
 727     return M_IMGDATA->m_data;
 728 }
 729
 730 void wxImage::SetData( unsigned char *data )
 731 {
 732     wxCHECK_RET( Ok(), wxT("invalid image") );
 733
 734     wxImageRefData *newRefData = new wxImageRefData();
 735
 736     newRefData->m_width = M_IMGDATA->m_width;
 737     newRefData->m_height = M_IMGDATA->m_height;
 738     newRefData->m_data = data;
 739     newRefData->m_ok = TRUE;
 740     newRefData->m_maskRed = M_IMGDATA->m_maskRed;
 741     newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
 742     newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
 743     newRefData->m_hasMask = M_IMGDATA->m_hasMask;
 744
 745     UnRef();
 746
 747     m_refData = newRefData;
 748 }
 749
 750 void wxImage::SetData( unsigned char *data, int new_width, int new_height )
 751 {
 752     wxImageRefData *newRefData = new wxImageRefData();
 753
 754     if (m_refData)
 755     {
 756         newRefData->m_width = new_width;
 757         newRefData->m_height = new_height;
 758         newRefData->m_data = data;
 759         newRefData->m_ok = TRUE;
 760         newRefData->m_maskRed = M_IMGDATA->m_maskRed;
 761         newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
 762         newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
 763         newRefData->m_hasMask = M_IMGDATA->m_hasMask;
 764     }
 765     else
 766     {
 767         newRefData->m_width = new_width;
 768         newRefData->m_height = new_height;
 769         newRefData->m_data = data;
 770         newRefData->m_ok = TRUE;
 771     }
 772
 773     UnRef();
 774
 775     m_refData = newRefData;
 776 }
 777
 778 // ----------------------------------------------------------------------------
 779 // alpha channel support
 780 // ----------------------------------------------------------------------------
 781
 782 void wxImage::SetAlpha(int x, int y, unsigned char alpha)
 783 {
 784     wxCHECK_RET( Ok() && HasAlpha(), wxT("invalid image or no alpha channel") );
 785
 786     int w = M_IMGDATA->m_width,
 787         h = M_IMGDATA->m_height;
 788
 789     wxCHECK_RET( x >=0 && y >= 0 && x < w && y < h, wxT("invalid image index") );
 790
 791     M_IMGDATA->m_alpha[y*w + x] = alpha;
 792 }
 793
 794 unsigned char wxImage::GetAlpha(int x, int y)
 795 {
 796     wxCHECK_MSG( Ok() && HasAlpha(), 0, wxT("invalid image or no alpha channel") );
 797
 798     int w = M_IMGDATA->m_width,
 799         h = M_IMGDATA->m_height;
 800
 801     wxCHECK_MSG( x >=0 && y >= 0 && x < w && y < h, 0, wxT("invalid image index") );
 802
 803     return M_IMGDATA->m_alpha[y*w + x];
 804 }
 805
 806 void wxImage::SetAlpha( unsigned char *alpha )
 807 {
 808     wxCHECK_RET( Ok(), wxT("invalid image") );
 809
 810     if ( !alpha )
 811     {
 812         alpha = (unsigned char *)
 813                     malloc(M_IMGDATA->m_width*M_IMGDATA->m_height*3);
 814     }
 815
 816     delete [] M_IMGDATA->m_alpha;
 817     M_IMGDATA->m_alpha = alpha;
 818 }
 819
 820 unsigned char *wxImage::GetAlpha() const
 821 {
 822     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
 823
 824     return M_IMGDATA->m_alpha;
 825 }
 826
 827 // ----------------------------------------------------------------------------
 828 // mask support
 829 // ----------------------------------------------------------------------------
 830
 831 void wxImage::SetMaskColour( unsigned char r, unsigned char g, unsigned char b )
 832 {
 833     wxCHECK_RET( Ok(), wxT("invalid image") );
 834
 835     M_IMGDATA->m_maskRed = r;
 836     M_IMGDATA->m_maskGreen = g;
 837     M_IMGDATA->m_maskBlue = b;
 838     M_IMGDATA->m_hasMask = TRUE;
 839 }
 840
 841 unsigned char wxImage::GetMaskRed() const
 842 {
 843     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 844
 845     return M_IMGDATA->m_maskRed;
 846 }
 847
 848 unsigned char wxImage::GetMaskGreen() const
 849 {
 850     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 851
 852     return M_IMGDATA->m_maskGreen;
 853 }
 854
 855 unsigned char wxImage::GetMaskBlue() const
 856 {
 857     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 858
 859     return M_IMGDATA->m_maskBlue;
 860 }
 861
 862 void wxImage::SetMask( bool mask )
 863 {
 864     wxCHECK_RET( Ok(), wxT("invalid image") );
 865
 866     M_IMGDATA->m_hasMask = mask;
 867 }
 868
 869 bool wxImage::HasMask() const
 870 {
 871     wxCHECK_MSG( Ok(), FALSE, wxT("invalid image") );
 872
 873     return M_IMGDATA->m_hasMask;
 874 }
 875
 876 int wxImage::GetWidth() const
 877 {
 878     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 879
 880     return M_IMGDATA->m_width;
 881 }
 882
 883 int wxImage::GetHeight() const
 884 {
 885     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 886
 887     return M_IMGDATA->m_height;
 888 }
 889
 890 bool wxImage::SetMaskFromImage(const wxImage& mask,
 891                                unsigned char mr, unsigned char mg, unsigned char mb)
 892 {
 893     // check that the images are the same size
 894     if ( (M_IMGDATA->m_height != mask.GetHeight() ) || (M_IMGDATA->m_width != mask.GetWidth () ) )
 895     {
 896         wxLogError( _("Image and Mask have different sizes") );
 897         return FALSE;
 898     }
 899
 900     // find unused colour
 901     unsigned char r,g,b ;
 902     if (!FindFirstUnusedColour(&r, &g, &b))
 903     {
 904         wxLogError( _("No Unused Color in image being masked") );
 905         return FALSE ;
 906     }
 907
 908     unsigned char *imgdata = GetData();
 909     unsigned char *maskdata = mask.GetData();
 910
 911     const int w = GetWidth();
 912     const int h = GetHeight();
 913
 914     for (int j = 0; j < h; j++)
 915     {
 916         for (int i = 0; i < w; i++)
 917         {
 918             if ((maskdata[0] == mr) && (maskdata[1]  == mg) && (maskdata[2] == mb))
 919             {
 920                 imgdata[0] = r;
 921                 imgdata[1] = g;
 922                 imgdata[2] = b;
 923             }
 924             imgdata  += 3;
 925             maskdata += 3;
 926         }
 927     }
 928
 929     SetMaskColour(r, g, b);
 930     SetMask(TRUE);
 931
 932     return TRUE;
 933 }
 934
 935 #if wxUSE_PALETTE
 936
 937 // Palette functions
 938
 939 bool wxImage::HasPalette() const
 940 {
 941     if (!Ok())
 942         return FALSE;
 943
 944     return M_IMGDATA->m_palette.Ok();
 945 }
 946
 947 const wxPalette& wxImage::GetPalette() const
 948 {
 949     wxCHECK_MSG( Ok(), wxNullPalette, wxT("invalid image") );
 950
 951     return M_IMGDATA->m_palette;
 952 }
 953
 954 void wxImage::SetPalette(const wxPalette& palette)
 955 {
 956     wxCHECK_RET( Ok(), wxT("invalid image") );
 957
 958     M_IMGDATA->m_palette = palette;
 959 }
 960
 961 #endif // wxUSE_PALETTE
 962
 963 // Option functions (arbitrary name/value mapping)
 964 void wxImage::SetOption(const wxString& name, const wxString& value)
 965 {
 966     wxCHECK_RET( Ok(), wxT("invalid image") );
 967
 968     int idx = M_IMGDATA->m_optionNames.Index(name, FALSE);
 969     if (idx == wxNOT_FOUND)
 970     {
 971         M_IMGDATA->m_optionNames.Add(name);
 972         M_IMGDATA->m_optionValues.Add(value);
 973     }
 974     else
 975     {
 976         M_IMGDATA->m_optionNames[idx] = name;
 977         M_IMGDATA->m_optionValues[idx] = value;
 978     }
 979 }
 980
 981 void wxImage::SetOption(const wxString& name, int value)
 982 {
 983     wxString valStr;
 984     valStr.Printf(wxT("%d"), value);
 985     SetOption(name, valStr);
 986 }
 987
 988 wxString wxImage::GetOption(const wxString& name) const
 989 {
 990     wxCHECK_MSG( Ok(), wxEmptyString, wxT("invalid image") );
 991
 992     int idx = M_IMGDATA->m_optionNames.Index(name, FALSE);
 993     if (idx == wxNOT_FOUND)
 994         return wxEmptyString;
 995     else
 996         return M_IMGDATA->m_optionValues[idx];
 997 }
 998
 999 int wxImage::GetOptionInt(const wxString& name) const
1000 {
1001     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1002
1003     return wxAtoi(GetOption(name));
1004 }
1005
1006 bool wxImage::HasOption(const wxString& name) const
1007 {
1008     wxCHECK_MSG( Ok(), FALSE, wxT("invalid image") );
1009
1010     return (M_IMGDATA->m_optionNames.Index(name, FALSE) != wxNOT_FOUND);
1011 }
1012
1013 bool wxImage::LoadFile( const wxString& filename, long type, int index )
1014 {
1015 #if wxUSE_STREAMS
1016     if (wxFileExists(filename))
1017     {
1018         wxFileInputStream stream(filename);
1019         wxBufferedInputStream bstream( stream );
1020         return LoadFile(bstream, type, index);
1021     }
1022     else
1023     {
1024         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
1025
1026         return FALSE;
1027     }
1028 #else // !wxUSE_STREAMS
1029     return FALSE;
1030 #endif // wxUSE_STREAMS
1031 }
1032
1033 bool wxImage::LoadFile( const wxString& filename, const wxString& mimetype, int index )
1034 {
1035 #if wxUSE_STREAMS
1036     if (wxFileExists(filename))
1037     {
1038         wxFileInputStream stream(filename);
1039         wxBufferedInputStream bstream( stream );
1040         return LoadFile(bstream, mimetype, index);
1041     }
1042     else
1043     {
1044         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
1045
1046         return FALSE;
1047     }
1048 #else // !wxUSE_STREAMS
1049     return FALSE;
1050 #endif // wxUSE_STREAMS
1051 }
1052
1053
1054
1055 bool wxImage::SaveFile( const wxString& filename ) const
1056 {
1057     wxString ext = filename.AfterLast('.').Lower();
1058
1059     wxImageHandler * pHandler = FindHandler(ext, -1);
1060     if (pHandler)
1061     {
1062         SaveFile(filename, pHandler->GetType());
1063         return TRUE;
1064     }
1065
1066     wxLogError(_("Can't save image to file '%s': unknown extension."), filename.c_str());
1067
1068     return FALSE;
1069 }
1070
1071 bool wxImage::SaveFile( const wxString& filename, int type ) const
1072 {
1073 #if wxUSE_STREAMS
1074     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
1075
1076     wxFileOutputStream stream(filename);
1077
1078     if ( stream.IsOk() )
1079     {
1080         wxBufferedOutputStream bstream( stream );
1081         return SaveFile(bstream, type);
1082     }
1083 #endif // wxUSE_STREAMS
1084
1085     return FALSE;
1086 }
1087
1088 bool wxImage::SaveFile( const wxString& filename, const wxString& mimetype ) const
1089 {
1090 #if wxUSE_STREAMS
1091     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
1092
1093     wxFileOutputStream stream(filename);
1094
1095     if ( stream.IsOk() )
1096     {
1097         wxBufferedOutputStream bstream( stream );
1098         return SaveFile(bstream, mimetype);
1099     }
1100 #endif // wxUSE_STREAMS
1101
1102     return FALSE;
1103 }
1104
1105 bool wxImage::CanRead( const wxString &name )
1106 {
1107 #if wxUSE_STREAMS
1108   wxFileInputStream stream(name);
1109   return CanRead(stream);
1110 #else
1111   return FALSE;
1112 #endif
1113 }
1114
1115 int wxImage::GetImageCount( const wxString &name, long type )
1116 {
1117 #if wxUSE_STREAMS
1118   wxFileInputStream stream(name);
1119   if (stream.Ok())
1120       return GetImageCount(stream, type);
1121 #endif
1122
1123   return 0;
1124 }
1125
1126 #if wxUSE_STREAMS
1127
1128 bool wxImage::CanRead( wxInputStream &stream )
1129 {
1130     const wxList& list = GetHandlers();
1131
1132     for ( wxList::Node *node = list.GetFirst(); node; node = node->GetNext() )
1133     {
1134         wxImageHandler *handler=(wxImageHandler*)node->GetData();
1135         if (handler->CanRead( stream ))
1136             return TRUE;
1137     }
1138
1139     return FALSE;
1140 }
1141
1142 int wxImage::GetImageCount( wxInputStream &stream, long type )
1143 {
1144     wxImageHandler *handler;
1145
1146     if ( type == wxBITMAP_TYPE_ANY )
1147     {
1148         wxList &list=GetHandlers();
1149
1150         for (wxList::Node *node = list.GetFirst(); node; node = node->GetNext())
1151         {
1152              handler=(wxImageHandler*)node->GetData();
1153              if ( handler->CanRead(stream) )
1154                  return handler->GetImageCount(stream);
1155
1156         }
1157
1158         wxLogWarning(_("No handler found for image type."));
1159         return 0;
1160     }
1161
1162     handler = FindHandler(type);
1163
1164     if ( !handler )
1165     {
1166         wxLogWarning(_("No image handler for type %d defined."), type);
1167         return FALSE;
1168     }
1169
1170     if ( handler->CanRead(stream) )
1171     {
1172         return handler->GetImageCount(stream);
1173     }
1174     else
1175     {
1176         wxLogError(_("Image file is not of type %d."), type);
1177         return 0;
1178     }
1179 }
1180
1181 bool wxImage::LoadFile( wxInputStream& stream, long type, int index )
1182 {
1183     UnRef();
1184
1185     m_refData = new wxImageRefData;
1186
1187     wxImageHandler *handler;
1188
1189     if ( type == wxBITMAP_TYPE_ANY )
1190     {
1191         wxList &list=GetHandlers();
1192
1193         for ( wxList::Node *node = list.GetFirst(); node; node = node->GetNext() )
1194         {
1195              handler=(wxImageHandler*)node->GetData();
1196              if ( handler->CanRead(stream) )
1197                  return handler->LoadFile(this, stream, TRUE/*verbose*/, index);
1198
1199         }
1200
1201         wxLogWarning( _("No handler found for image type.") );
1202         return FALSE;
1203     }
1204
1205     handler = FindHandler(type);
1206
1207     if (handler == 0)
1208     {
1209         wxLogWarning( _("No image handler for type %d defined."), type );
1210
1211         return FALSE;
1212     }
1213
1214     return handler->LoadFile(this, stream, TRUE/*verbose*/, index);
1215 }
1216
1217 bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int index )
1218 {
1219     UnRef();
1220
1221     m_refData = new wxImageRefData;
1222
1223     wxImageHandler *handler = FindHandlerMime(mimetype);
1224
1225     if (handler == 0)
1226     {
1227         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1228
1229         return FALSE;
1230     }
1231
1232     return handler->LoadFile( this, stream, TRUE/*verbose*/, index );
1233 }
1234
1235 bool wxImage::SaveFile( wxOutputStream& stream, int type ) const
1236 {
1237     wxCHECK_MSG( Ok(), FALSE, wxT("invalid image") );
1238
1239     wxImageHandler *handler = FindHandler(type);
1240
1241     if (handler == 0)
1242     {
1243         wxLogWarning( _("No image handler for type %d defined."), type );
1244
1245         return FALSE;
1246     }
1247
1248     return handler->SaveFile( (wxImage*)this, stream );
1249 }
1250
1251 bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype ) const
1252 {
1253     wxCHECK_MSG( Ok(), FALSE, wxT("invalid image") );
1254
1255     wxImageHandler *handler = FindHandlerMime(mimetype);
1256
1257     if (handler == 0)
1258     {
1259         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1260
1261         return FALSE;
1262     }
1263
1264     return handler->SaveFile( (wxImage*)this, stream );
1265 }
1266 #endif // wxUSE_STREAMS
1267
1268 void wxImage::AddHandler( wxImageHandler *handler )
1269 {
1270     // make sure that the memory will be freed at the program end
1271     sm_handlers.DeleteContents(TRUE);
1272
1273     // Check for an existing handler of the type being added.
1274     if (FindHandler( handler->GetType() ) == 0)
1275     {
1276         sm_handlers.Append( handler );
1277     }
1278     else
1279     {
1280         // This is not documented behaviour, merely the simplest 'fix'
1281         // for preventing duplicate additions.  If someone ever has
1282         // a good reason to add and remove duplicate handlers (and they
1283         // may) we should probably refcount the duplicates.
1284         //   also an issue in InsertHandler below.
1285
1286         wxLogDebug( _T("Adding duplicate image handler for '%s'"),
1287                     handler->GetName().c_str() );
1288         delete handler;
1289     }
1290 }
1291
1292 void wxImage::InsertHandler( wxImageHandler *handler )
1293 {
1294     // make sure that the memory will be freed at the program end
1295     sm_handlers.DeleteContents(TRUE);
1296
1297     // Check for an existing handler of the type being added.
1298     if (FindHandler( handler->GetType() ) == 0)
1299     {
1300         sm_handlers.Insert( handler );
1301     }
1302     else
1303     {
1304         // see AddHandler for additional comments.
1305         wxLogDebug( _T("Inserting duplicate image handler for '%s'"),
1306                     handler->GetName().c_str() );
1307         delete handler;
1308     }
1309 }
1310
1311 bool wxImage::RemoveHandler( const wxString& name )
1312 {
1313     wxImageHandler *handler = FindHandler(name);
1314     if (handler)
1315     {
1316         sm_handlers.DeleteObject(handler);
1317         return TRUE;
1318     }
1319     else
1320         return FALSE;
1321 }
1322
1323 wxImageHandler *wxImage::FindHandler( const wxString& name )
1324 {
1325     wxNode *node = sm_handlers.GetFirst();
1326     while (node)
1327     {
1328         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1329         if (handler->GetName().Cmp(name) == 0) return handler;
1330
1331         node = node->GetNext();
1332     }
1333     return 0;
1334 }
1335
1336 wxImageHandler *wxImage::FindHandler( const wxString& extension, long bitmapType )
1337 {
1338     wxNode *node = sm_handlers.GetFirst();
1339     while (node)
1340     {
1341         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1342         if ( (handler->GetExtension().Cmp(extension) == 0) &&
1343             (bitmapType == -1 || handler->GetType() == bitmapType) )
1344             return handler;
1345         node = node->GetNext();
1346     }
1347     return 0;
1348 }
1349
1350 wxImageHandler *wxImage::FindHandler( long bitmapType )
1351 {
1352     wxNode *node = sm_handlers.GetFirst();
1353     while (node)
1354     {
1355         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1356         if (handler->GetType() == bitmapType) return handler;
1357         node = node->GetNext();
1358     }
1359     return 0;
1360 }
1361
1362 wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype )
1363 {
1364     wxNode *node = sm_handlers.GetFirst();
1365     while (node)
1366     {
1367         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1368         if (handler->GetMimeType().IsSameAs(mimetype, FALSE)) return handler;
1369         node = node->GetNext();
1370     }
1371     return 0;
1372 }
1373
1374 void wxImage::InitStandardHandlers()
1375 {
1376 #if wxUSE_STREAMS
1377     AddHandler(new wxBMPHandler);
1378 #endif // wxUSE_STREAMS
1379 }
1380
1381 void wxImage::CleanUpHandlers()
1382 {
1383     wxNode *node = sm_handlers.GetFirst();
1384     while (node)
1385     {
1386         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1387         wxNode *next = node->GetNext();
1388         delete handler;
1389         delete node;
1390         node = next;
1391     }
1392 }
1393
1394
1395 //-----------------------------------------------------------------------------
1396 // wxImageHandler
1397 //-----------------------------------------------------------------------------
1398
1399 IMPLEMENT_ABSTRACT_CLASS(wxImageHandler,wxObject)
1400
1401 #if wxUSE_STREAMS
1402 bool wxImageHandler::LoadFile( wxImage *WXUNUSED(image), wxInputStream& WXUNUSED(stream), bool WXUNUSED(verbose), int WXUNUSED(index) )
1403 {
1404     return FALSE;
1405 }
1406
1407 bool wxImageHandler::SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream), bool WXUNUSED(verbose) )
1408 {
1409     return FALSE;
1410 }
1411
1412 int wxImageHandler::GetImageCount( wxInputStream& WXUNUSED(stream) )
1413 {
1414     return 1;
1415 }
1416
1417 bool wxImageHandler::CanRead( const wxString& name )
1418 {
1419     if (wxFileExists(name))
1420     {
1421         wxFileInputStream stream(name);
1422         return CanRead(stream);
1423     }
1424
1425     wxLogError( _("Can't check image format of file '%s': file does not exist."), name.c_str() );
1426
1427     return FALSE;
1428 }
1429
1430 bool wxImageHandler::CallDoCanRead(wxInputStream& stream)
1431 {
1432     off_t posOld = stream.TellI();
1433     if ( posOld == wxInvalidOffset )
1434     {
1435         // can't test unseekable stream
1436         return FALSE;
1437     }
1438
1439     bool ok = DoCanRead(stream);
1440
1441     // restore the old position to be able to test other formats and so on
1442     if ( stream.SeekI(posOld) == wxInvalidOffset )
1443     {
1444         wxLogDebug(_T("Failed to rewind the stream in wxImageHandler!"));
1445
1446         // reading would fail anyhow as we're not at the right position
1447         return FALSE;
1448     }
1449
1450     return ok;
1451 }
1452
1453 #endif // wxUSE_STREAMS
1454
1455
1456
1457 //-----------------------------------------------------------------------------
1458 // Deprecated wxBitmap conversion routines
1459 //-----------------------------------------------------------------------------
1460
1461 #if WXWIN_COMPATIBILITY_2_2 && wxUSE_GUI
1462
1463 #ifdef __WXGTK__
1464 wxBitmap wxImage::ConvertToMonoBitmap( unsigned char red, unsigned char green, unsigned char blue ) const
1465 {
1466     wxImage mono = this->ConvertToMono( red, green, blue );
1467     wxBitmap bitmap( mono, 1 );
1468     return bitmap;
1469 }
1470 #endif
1471
1472 wxBitmap wxImage::ConvertToBitmap() const
1473 {
1474     wxBitmap bitmap( *this );
1475     return bitmap;
1476 }
1477
1478 wxImage::wxImage( const wxBitmap &bitmap )
1479 {
1480     *this = bitmap.ConvertToImage();
1481 }
1482
1483 #endif // WXWIN_COMPATIBILITY_2_2 && wxUSE_GUI
1484
1485
1486 // ----------------------------------------------------------------------------
1487 // image histogram stuff
1488 // ----------------------------------------------------------------------------
1489
1490 bool
1491 wxImageHistogram::FindFirstUnusedColour(unsigned char *r,
1492                                         unsigned char *g,
1493                                         unsigned char *b,
1494                                         unsigned char r2,
1495                                         unsigned char b2,
1496                                         unsigned char g2) const
1497 {
1498     unsigned long key = MakeKey(r2, g2, b2);
1499
1500     while ( find(key) != end() )
1501     {
1502         // color already used
1503         r2++;
1504         if ( r2 >= 255 )
1505         {
1506             r2 = 0;
1507             g2++;
1508             if ( g2 >= 255 )
1509             {
1510                 g2 = 0;
1511                 b2++;
1512                 if ( b2 >= 255 )
1513                 {
1514                     wxLogError(_("GetUnusedColour:: No Unused Color in image ") );
1515                     return FALSE;
1516                 }
1517             }
1518         }
1519
1520         key = MakeKey(r2, g2, b2);
1521     }
1522
1523     if ( r )
1524         *r = r2;
1525     if ( g )
1526         *g = g2;
1527     if ( b )
1528         *b = b2;
1529
1530     return TRUE;
1531 }
1532
1533 bool
1534 wxImage::FindFirstUnusedColour(unsigned char *r,
1535                                unsigned char *g,
1536                                unsigned char *b,
1537                                unsigned char r2,
1538                                unsigned char b2,
1539                                unsigned char g2) const
1540 {
1541     wxImageHistogram histogram;
1542
1543     ComputeHistogram(histogram);
1544
1545     return histogram.FindFirstUnusedColour(r, g, b, r2, g2, b2);
1546 }
1547
1548
1549
1550 // GRG, Dic/99
1551 // Counts and returns the number of different colours. Optionally stops
1552 // when it exceeds 'stopafter' different colours. This is useful, for
1553 // example, to see if the image can be saved as 8-bit (256 colour or
1554 // less, in this case it would be invoked as CountColours(256)). Default
1555 // value for stopafter is -1 (don't care).
1556 //
1557 unsigned long wxImage::CountColours( unsigned long stopafter ) const
1558 {
1559     wxHashTable h;
1560     wxObject dummy;
1561     unsigned char r, g, b;
1562     unsigned char *p;
1563     unsigned long size, nentries, key;
1564
1565     p = GetData();
1566     size = GetWidth() * GetHeight();
1567     nentries = 0;
1568
1569     for (unsigned long j = 0; (j < size) && (nentries <= stopafter) ; j++)
1570     {
1571         r = *(p++);
1572         g = *(p++);
1573         b = *(p++);
1574         key = wxImageHistogram::MakeKey(r, g, b);
1575
1576         if (h.Get(key) == NULL)
1577         {
1578             h.Put(key, &dummy);
1579             nentries++;
1580         }
1581     }
1582
1583     return nentries;
1584 }
1585
1586
1587 unsigned long wxImage::ComputeHistogram( wxImageHistogram &h ) const
1588 {
1589     unsigned char *p = GetData();
1590     unsigned long nentries = 0;
1591
1592     h.clear();
1593
1594     const unsigned long size = GetWidth() * GetHeight();
1595
1596     unsigned char r, g, b;
1597     for ( unsigned long n = 0; n < size; n++ )
1598     {
1599         r = *p++;
1600         g = *p++;
1601         b = *p++;
1602
1603         wxImageHistogramEntry& entry = h[wxImageHistogram::MakeKey(r, g, b)];
1604
1605         if ( entry.value++ == 0 )
1606             entry.index = nentries++;
1607     }
1608
1609     return nentries;
1610 }
1611
1612 /*
1613  * Rotation code by Carlos Moreno
1614  */
1615
1616 // GRG: I've removed wxRotationPoint - we already have wxRealPoint which
1617 //      does exactly the same thing. And I also got rid of wxRotationPixel
1618 //      bacause of potential problems in architectures where alignment
1619 //      is an issue, so I had to rewrite parts of the code.
1620
1621 static const double gs_Epsilon = 1e-10;
1622
1623 static inline int wxCint (double x)
1624 {
1625     return (x > 0) ? (int) (x + 0.5) : (int) (x - 0.5);
1626 }
1627
1628
1629 // Auxiliary function to rotate a point (x,y) with respect to point p0
1630 // make it inline and use a straight return to facilitate optimization
1631 // also, the function receives the sine and cosine of the angle to avoid
1632 // repeating the time-consuming calls to these functions -- sin/cos can
1633 // be computed and stored in the calling function.
1634
1635 inline wxRealPoint rotated_point (const wxRealPoint & p, double cos_angle, double sin_angle, const wxRealPoint & p0)
1636 {
1637     return wxRealPoint (p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle,
1638                         p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle);
1639 }
1640
1641 inline wxRealPoint rotated_point (double x, double y, double cos_angle, double sin_angle, const wxRealPoint & p0)
1642 {
1643     return rotated_point (wxRealPoint(x,y), cos_angle, sin_angle, p0);
1644 }
1645
1646 wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool interpolating, wxPoint * offset_after_rotation) const
1647 {
1648     int i;
1649     angle = -angle;     // screen coordinates are a mirror image of "real" coordinates
1650
1651     // Create pointer-based array to accelerate access to wxImage's data
1652     unsigned char ** data = new unsigned char * [GetHeight()];
1653
1654     data[0] = GetData();
1655
1656     for (i = 1; i < GetHeight(); i++)
1657         data[i] = data[i - 1] + (3 * GetWidth());
1658
1659     // precompute coefficients for rotation formula
1660     // (sine and cosine of the angle)
1661     const double cos_angle = cos(angle);
1662     const double sin_angle = sin(angle);
1663
1664     // Create new Image to store the result
1665     // First, find rectangle that covers the rotated image;  to do that,
1666     // rotate the four corners
1667
1668     const wxRealPoint p0(centre_of_rotation.x, centre_of_rotation.y);
1669
1670     wxRealPoint p1 = rotated_point (0, 0, cos_angle, sin_angle, p0);
1671     wxRealPoint p2 = rotated_point (0, GetHeight(), cos_angle, sin_angle, p0);
1672     wxRealPoint p3 = rotated_point (GetWidth(), 0, cos_angle, sin_angle, p0);
1673     wxRealPoint p4 = rotated_point (GetWidth(), GetHeight(), cos_angle, sin_angle, p0);
1674
1675     int x1 = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x)));
1676     int y1 = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y)));
1677     int x2 = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x)));
1678     int y2 = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y)));
1679
1680     wxImage rotated (x2 - x1 + 1, y2 - y1 + 1, false);
1681
1682     if (offset_after_rotation != NULL)
1683     {
1684         *offset_after_rotation = wxPoint (x1, y1);
1685     }
1686
1687     // GRG: The rotated (destination) image is always accessed
1688     //      sequentially, so there is no need for a pointer-based
1689     //      array here (and in fact it would be slower).
1690     //
1691     unsigned char * dst = rotated.GetData();
1692
1693     // GRG: if the original image has a mask, use its RGB values
1694     //      as the blank pixel, else, fall back to default (black).
1695     //
1696     unsigned char blank_r = 0;
1697     unsigned char blank_g = 0;
1698     unsigned char blank_b = 0;
1699
1700     if (HasMask())
1701     {
1702         blank_r = GetMaskRed();
1703         blank_g = GetMaskGreen();
1704         blank_b = GetMaskBlue();
1705         rotated.SetMaskColour( blank_r, blank_g, blank_b );
1706     }
1707
1708     // Now, for each point of the rotated image, find where it came from, by
1709     // performing an inverse rotation (a rotation of -angle) and getting the
1710     // pixel at those coordinates
1711
1712     // GRG: I've taken the (interpolating) test out of the loops, so that
1713     //      it is done only once, instead of repeating it for each pixel.
1714
1715     int x;
1716     if (interpolating)
1717     {
1718         for (int y = 0; y < rotated.GetHeight(); y++)
1719         {
1720             for (x = 0; x < rotated.GetWidth(); x++)
1721             {
1722                 wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
1723
1724                 if (-0.25 < src.x && src.x < GetWidth() - 0.75 &&
1725                     -0.25 < src.y && src.y < GetHeight() - 0.75)
1726                 {
1727                     // interpolate using the 4 enclosing grid-points.  Those
1728                     // points can be obtained using floor and ceiling of the
1729                     // exact coordinates of the point
1730                         // C.M. 2000-02-17:  when the point is near the border, special care is required.
1731
1732                     int x1, y1, x2, y2;
1733
1734                     if (0 < src.x && src.x < GetWidth() - 1)
1735                     {
1736                         x1 = wxCint(floor(src.x));
1737                         x2 = wxCint(ceil(src.x));
1738                     }
1739                     else    // else means that x is near one of the borders (0 or width-1)
1740                     {
1741                         x1 = x2 = wxCint (src.x);
1742                     }
1743
1744                     if (0 < src.y && src.y < GetHeight() - 1)
1745                     {
1746                         y1 = wxCint(floor(src.y));
1747                         y2 = wxCint(ceil(src.y));
1748                     }
1749                     else
1750                     {
1751                         y1 = y2 = wxCint (src.y);
1752                     }
1753
1754                     // get four points and the distances (square of the distance,
1755                     // for efficiency reasons) for the interpolation formula
1756
1757                     // GRG: Do not calculate the points until they are
1758                     //      really needed -- this way we can calculate
1759                     //      just one, instead of four, if d1, d2, d3
1760                     //      or d4 are < gs_Epsilon
1761
1762                     const double d1 = (src.x - x1) * (src.x - x1) + (src.y - y1) * (src.y - y1);
1763                     const double d2 = (src.x - x2) * (src.x - x2) + (src.y - y1) * (src.y - y1);
1764                     const double d3 = (src.x - x2) * (src.x - x2) + (src.y - y2) * (src.y - y2);
1765                     const double d4 = (src.x - x1) * (src.x - x1) + (src.y - y2) * (src.y - y2);
1766
1767                     // Now interpolate as a weighted average of the four surrounding
1768                     // points, where the weights are the distances to each of those points
1769
1770                     // If the point is exactly at one point of the grid of the source
1771                     // image, then don't interpolate -- just assign the pixel
1772
1773                     if (d1 < gs_Epsilon)        // d1,d2,d3,d4 are positive -- no need for abs()
1774                     {
1775                         unsigned char *p = data[y1] + (3 * x1);
1776                         *(dst++) = *(p++);
1777                         *(dst++) = *(p++);
1778                         *(dst++) = *(p++);
1779                     }
1780                     else if (d2 < gs_Epsilon)
1781                     {
1782                         unsigned char *p = data[y1] + (3 * x2);
1783                         *(dst++) = *(p++);
1784                         *(dst++) = *(p++);
1785                         *(dst++) = *(p++);
1786                     }
1787                     else if (d3 < gs_Epsilon)
1788                     {
1789                         unsigned char *p = data[y2] + (3 * x2);
1790                         *(dst++) = *(p++);
1791                         *(dst++) = *(p++);
1792                         *(dst++) = *(p++);
1793                     }
1794                     else if (d4 < gs_Epsilon)
1795                     {
1796                         unsigned char *p = data[y2] + (3 * x1);
1797                         *(dst++) = *(p++);
1798                         *(dst++) = *(p++);
1799                         *(dst++) = *(p++);
1800                     }
1801                     else
1802                     {
1803                         // weights for the weighted average are proportional to the inverse of the distance
1804                         unsigned char *v1 = data[y1] + (3 * x1);
1805                         unsigned char *v2 = data[y1] + (3 * x2);
1806                         unsigned char *v3 = data[y2] + (3 * x2);
1807                         unsigned char *v4 = data[y2] + (3 * x1);
1808
1809                         const double w1 = 1/d1, w2 = 1/d2, w3 = 1/d3, w4 = 1/d4;
1810
1811                         // GRG: Unrolled.
1812
1813                         *(dst++) = (unsigned char)
1814                             ( (w1 * *(v1++) + w2 * *(v2++) +
1815                                w3 * *(v3++) + w4 * *(v4++)) /
1816                               (w1 + w2 + w3 + w4) );
1817                         *(dst++) = (unsigned char)
1818                             ( (w1 * *(v1++) + w2 * *(v2++) +
1819                                w3 * *(v3++) + w4 * *(v4++)) /
1820                               (w1 + w2 + w3 + w4) );
1821                         *(dst++) = (unsigned char)
1822                             ( (w1 * *(v1++) + w2 * *(v2++) +
1823                                w3 * *(v3++) + w4 * *(v4++)) /
1824                               (w1 + w2 + w3 + w4) );
1825                     }
1826                 }
1827                 else
1828                 {
1829                     *(dst++) = blank_r;
1830                     *(dst++) = blank_g;
1831                     *(dst++) = blank_b;
1832                 }
1833             }
1834         }
1835     }
1836     else    // not interpolating
1837     {
1838         for (int y = 0; y < rotated.GetHeight(); y++)
1839         {
1840             for (x = 0; x < rotated.GetWidth(); x++)
1841             {
1842                 wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
1843
1844                 const int xs = wxCint (src.x);      // wxCint rounds to the
1845                 const int ys = wxCint (src.y);      // closest integer
1846
1847                 if (0 <= xs && xs < GetWidth() &&
1848                     0 <= ys && ys < GetHeight())
1849                 {
1850                     unsigned char *p = data[ys] + (3 * xs);
1851                     *(dst++) = *(p++);
1852                     *(dst++) = *(p++);
1853                     *(dst++) = *(p++);
1854                 }
1855                 else
1856                 {
1857                     *(dst++) = blank_r;
1858                     *(dst++) = blank_g;
1859                     *(dst++) = blank_b;
1860                 }
1861             }
1862         }
1863     }
1864
1865     delete [] data;
1866
1867     return rotated;
1868 }
1869
1870
1871
1872
1873
1874 // A module to allow wxImage initialization/cleanup
1875 // without calling these functions from app.cpp or from
1876 // the user's application.
1877
1878 class wxImageModule: public wxModule
1879 {
1880 DECLARE_DYNAMIC_CLASS(wxImageModule)
1881 public:
1882     wxImageModule() {}
1883     bool OnInit() { wxImage::InitStandardHandlers(); return TRUE; };
1884     void OnExit() { wxImage::CleanUpHandlers(); };
1885 };
1886
1887 IMPLEMENT_DYNAMIC_CLASS(wxImageModule, wxModule)
1888
1889
1890 #endif // wxUSE_IMAGE