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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  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 #include "wx/utils.h"
  36 #include "wx/math.h"
  37
  38 #if wxUSE_XPM
  39 #include "wx/xpmdecod.h"
  40 #endif
  41
  42 // For memcpy
  43 #include <string.h>
  44
  45 #ifdef __SALFORDC__
  46     #undef FAR
  47 #endif
  48
  49
  50 //-----------------------------------------------------------------------------
  51 // wxImage
  52 //-----------------------------------------------------------------------------
  53
  54 class wxImageRefData: public wxObjectRefData
  55 {
  56 public:
  57     wxImageRefData();
  58     virtual ~wxImageRefData();
  59
  60     int             m_width;
  61     int             m_height;
  62     unsigned char  *m_data;
  63
  64     bool            m_hasMask;
  65     unsigned char   m_maskRed,m_maskGreen,m_maskBlue;
  66
  67     // alpha channel data, may be NULL for the formats without alpha support
  68     unsigned char  *m_alpha;
  69
  70     bool            m_ok;
  71
  72     // if true, m_data is pointer to static data and shouldn't be freed
  73     bool            m_static;
  74
  75     // same as m_static but for m_alpha
  76     bool            m_staticAlpha;
  77
  78 #if wxUSE_PALETTE
  79     wxPalette       m_palette;
  80 #endif // wxUSE_PALETTE
  81
  82     wxArrayString   m_optionNames;
  83     wxArrayString   m_optionValues;
  84
  85     DECLARE_NO_COPY_CLASS(wxImageRefData)
  86 };
  87
  88 wxImageRefData::wxImageRefData()
  89 {
  90     m_width = 0;
  91     m_height = 0;
  92     m_data =
  93     m_alpha = (unsigned char *) NULL;
  94
  95     m_maskRed = 0;
  96     m_maskGreen = 0;
  97     m_maskBlue = 0;
  98     m_hasMask = false;
  99
 100     m_ok = false;
 101     m_static =
 102     m_staticAlpha = false;
 103 }
 104
 105 wxImageRefData::~wxImageRefData()
 106 {
 107     if ( !m_static )
 108         free( m_data );
 109     if ( !m_staticAlpha )
 110         free( m_alpha );
 111 }
 112
 113 wxList wxImage::sm_handlers;
 114
 115 wxImage wxNullImage;
 116
 117 //-----------------------------------------------------------------------------
 118
 119 #define M_IMGDATA ((wxImageRefData *)m_refData)
 120
 121 IMPLEMENT_DYNAMIC_CLASS(wxImage, wxObject)
 122
 123 wxImage::wxImage( int width, int height, bool clear )
 124 {
 125     Create( width, height, clear );
 126 }
 127
 128 wxImage::wxImage( int width, int height, unsigned char* data, bool static_data )
 129 {
 130     Create( width, height, data, static_data );
 131 }
 132
 133 wxImage::wxImage( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data )
 134 {
 135     Create( width, height, data, alpha, static_data );
 136 }
 137
 138 wxImage::wxImage( const wxString& name, long type, int index )
 139 {
 140     LoadFile( name, type, index );
 141 }
 142
 143 wxImage::wxImage( const wxString& name, const wxString& mimetype, int index )
 144 {
 145     LoadFile( name, mimetype, index );
 146 }
 147
 148 #if wxUSE_STREAMS
 149 wxImage::wxImage( wxInputStream& stream, long type, int index )
 150 {
 151     LoadFile( stream, type, index );
 152 }
 153
 154 wxImage::wxImage( wxInputStream& stream, const wxString& mimetype, int index )
 155 {
 156     LoadFile( stream, mimetype, index );
 157 }
 158 #endif // wxUSE_STREAMS
 159
 160 wxImage::wxImage( const wxImage& image )
 161     : wxObject()
 162 {
 163     Ref(image);
 164 }
 165
 166 wxImage::wxImage( const wxImage* image )
 167 {
 168     if (image) Ref(*image);
 169 }
 170
 171 wxImage::wxImage( const char** xpmData )
 172 {
 173     Create(xpmData);
 174 }
 175
 176 wxImage::wxImage( char** xpmData )
 177 {
 178     Create((const char**) xpmData);
 179 }
 180
 181 bool wxImage::Create( const char** xpmData )
 182 {
 183 #if wxUSE_XPM
 184     UnRef();
 185
 186     wxXPMDecoder decoder;
 187     (*this) = decoder.ReadData(xpmData);
 188     return Ok();
 189 #else
 190     return false;
 191 #endif
 192 }
 193
 194 bool wxImage::Create( int width, int height, bool clear )
 195 {
 196     UnRef();
 197
 198     m_refData = new wxImageRefData();
 199
 200     M_IMGDATA->m_data = (unsigned char *) malloc( width*height*3 );
 201     if (!M_IMGDATA->m_data)
 202     {
 203         UnRef();
 204         return false;
 205     }
 206
 207     if (clear)
 208         memset(M_IMGDATA->m_data, 0, width*height*3);
 209
 210     M_IMGDATA->m_width = width;
 211     M_IMGDATA->m_height = height;
 212     M_IMGDATA->m_ok = true;
 213
 214     return true;
 215 }
 216
 217 bool wxImage::Create( int width, int height, unsigned char* data, bool static_data )
 218 {
 219     UnRef();
 220
 221     wxCHECK_MSG( data, false, _T("NULL data in wxImage::Create") );
 222
 223     m_refData = new wxImageRefData();
 224
 225     M_IMGDATA->m_data = data;
 226     M_IMGDATA->m_width = width;
 227     M_IMGDATA->m_height = height;
 228     M_IMGDATA->m_ok = true;
 229     M_IMGDATA->m_static = static_data;
 230
 231     return true;
 232 }
 233
 234 bool wxImage::Create( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data )
 235 {
 236     UnRef();
 237
 238     wxCHECK_MSG( data, false, _T("NULL data in wxImage::Create") );
 239
 240     m_refData = new wxImageRefData();
 241
 242     M_IMGDATA->m_data = data;
 243     M_IMGDATA->m_alpha = alpha;
 244     M_IMGDATA->m_width = width;
 245     M_IMGDATA->m_height = height;
 246     M_IMGDATA->m_ok = true;
 247     M_IMGDATA->m_static = static_data;
 248
 249     return true;
 250 }
 251
 252 void wxImage::Destroy()
 253 {
 254     UnRef();
 255 }
 256
 257 wxImage wxImage::Copy() const
 258 {
 259     wxImage image;
 260
 261     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 262
 263     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 264
 265     unsigned char *data = image.GetData();
 266
 267     wxCHECK_MSG( data, image, wxT("unable to create image") );
 268
 269     image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 270     image.SetMask( M_IMGDATA->m_hasMask );
 271
 272     memcpy( data, GetData(), M_IMGDATA->m_width*M_IMGDATA->m_height*3 );
 273
 274     // also copy the image options
 275     wxImageRefData *imgData = (wxImageRefData *)image.m_refData;
 276     imgData->m_optionNames = M_IMGDATA->m_optionNames;
 277     imgData->m_optionValues = M_IMGDATA->m_optionValues;
 278
 279     return image;
 280 }
 281
 282 wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const
 283 {
 284     if( xFactor == 1 && yFactor == 1 )
 285         return Copy() ;
 286
 287     wxImage image;
 288
 289     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 290
 291     // can't scale to/from 0 size
 292     wxCHECK_MSG( (xFactor > 0) && (yFactor > 0), image,
 293                  wxT("invalid new image size") );
 294
 295     long old_height = M_IMGDATA->m_height,
 296          old_width  = M_IMGDATA->m_width;
 297
 298     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 299                  wxT("invalid old image size") );
 300
 301     long width = old_width / xFactor ;
 302     long height = old_height / yFactor ;
 303
 304     image.Create( width, height, false );
 305
 306     char unsigned *data = image.GetData();
 307
 308     wxCHECK_MSG( data, image, wxT("unable to create image") );
 309
 310     bool hasMask = false ;
 311     unsigned char maskRed = 0;
 312     unsigned char maskGreen = 0;
 313     unsigned char maskBlue =0 ;
 314
 315     unsigned char *source_data = M_IMGDATA->m_data;
 316     unsigned char *target_data = data;
 317     unsigned char *source_alpha = 0 ;
 318     unsigned char *target_alpha = 0 ;
 319     if (M_IMGDATA->m_hasMask)
 320     {
 321         hasMask = true ;
 322         maskRed = M_IMGDATA->m_maskRed;
 323         maskGreen = M_IMGDATA->m_maskGreen;
 324         maskBlue =M_IMGDATA->m_maskBlue ;
 325
 326         image.SetMaskColour( M_IMGDATA->m_maskRed,
 327                              M_IMGDATA->m_maskGreen,
 328                              M_IMGDATA->m_maskBlue );
 329     }
 330     else
 331     {
 332         source_alpha = M_IMGDATA->m_alpha ;
 333         if ( source_alpha )
 334         {
 335             image.SetAlpha() ;
 336             target_alpha = image.GetAlpha() ;
 337         }
 338     }
 339
 340     for (long y = 0; y < height; y++)
 341     {
 342         for (long x = 0; x < width; x++)
 343         {
 344             unsigned long avgRed = 0 ;
 345             unsigned long avgGreen = 0;
 346             unsigned long avgBlue = 0;
 347             unsigned long avgAlpha = 0 ;
 348             unsigned long counter = 0 ;
 349             // determine average
 350             for ( int y1 = 0 ; y1 < yFactor ; ++y1 )
 351             {
 352                 long y_offset = (y * yFactor + y1) * old_width;
 353                 for ( int x1 = 0 ; x1 < xFactor ; ++x1 )
 354                 {
 355                     unsigned char *pixel = source_data + 3 * ( y_offset + x * xFactor + x1 ) ;
 356                     unsigned char red = pixel[0] ;
 357                     unsigned char green = pixel[1] ;
 358                     unsigned char blue = pixel[2] ;
 359                     unsigned char alpha = 255  ;
 360                     if ( source_alpha )
 361                         alpha = *(source_alpha + y_offset + x * xFactor + x1) ;
 362                     if ( !hasMask || red != maskRed || green != maskGreen || blue != maskBlue )
 363                     {
 364                         if ( alpha > 0 )
 365                         {
 366                             avgRed += red ;
 367                             avgGreen += green ;
 368                             avgBlue += blue ;
 369                         }
 370                         avgAlpha += alpha ;
 371                         counter++ ;
 372                     }
 373                 }
 374             }
 375             if ( counter == 0 )
 376             {
 377                 *(target_data++) = M_IMGDATA->m_maskRed ;
 378                 *(target_data++) = M_IMGDATA->m_maskGreen ;
 379                 *(target_data++) = M_IMGDATA->m_maskBlue ;
 380             }
 381             else
 382             {
 383                 if ( source_alpha )
 384                     *(target_alpha++) = (unsigned char)(avgAlpha / counter ) ;
 385                 *(target_data++) = (unsigned char)(avgRed / counter);
 386                 *(target_data++) = (unsigned char)(avgGreen / counter);
 387                 *(target_data++) = (unsigned char)(avgBlue / counter);
 388             }
 389         }
 390     }
 391
 392     // In case this is a cursor, make sure the hotspot is scalled accordingly:
 393     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
 394         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
 395                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X))/xFactor);
 396     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
 397         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
 398                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y))/yFactor);
 399
 400     return image;
 401 }
 402
 403 wxImage wxImage::Scale( int width, int height ) const
 404 {
 405     wxImage image;
 406
 407     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 408
 409     // can't scale to/from 0 size
 410     wxCHECK_MSG( (width > 0) && (height > 0), image,
 411                  wxT("invalid new image size") );
 412
 413     long old_height = M_IMGDATA->m_height,
 414          old_width  = M_IMGDATA->m_width;
 415     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 416                  wxT("invalid old image size") );
 417
 418     if ( old_width % width == 0 && old_width >= width &&
 419         old_height % height == 0 && old_height >= height )
 420     {
 421         return ShrinkBy( old_width / width , old_height / height ) ;
 422     }
 423     image.Create( width, height, false );
 424
 425     unsigned char *data = image.GetData();
 426
 427     wxCHECK_MSG( data, image, wxT("unable to create image") );
 428
 429     unsigned char *source_data = M_IMGDATA->m_data;
 430     unsigned char *target_data = data;
 431     unsigned char *source_alpha = 0 ;
 432     unsigned char *target_alpha = 0 ;
 433
 434     if (M_IMGDATA->m_hasMask)
 435     {
 436         image.SetMaskColour( M_IMGDATA->m_maskRed,
 437                              M_IMGDATA->m_maskGreen,
 438                              M_IMGDATA->m_maskBlue );
 439     }
 440     else
 441     {
 442         source_alpha = M_IMGDATA->m_alpha ;
 443         if ( source_alpha )
 444         {
 445             image.SetAlpha() ;
 446             target_alpha = image.GetAlpha() ;
 447         }
 448     }
 449
 450     long x_delta = (old_width<<16) / width;
 451     long y_delta = (old_height<<16) / height;
 452
 453     unsigned char* dest_pixel = target_data;
 454
 455     long y = 0;
 456     for ( long j = 0; j < height; j++ )
 457         {
 458         unsigned char* src_line = &source_data[(y>>16)*old_width*3];
 459         unsigned char* src_alpha_line = source_alpha ? &source_alpha[(y>>16)*old_width] : 0 ;
 460
 461         long x = 0;
 462         for ( long i = 0; i < width; i++ )
 463         {
 464              unsigned char* src_pixel = &src_line[(x>>16)*3];
 465              unsigned char* src_alpha_pixel = source_alpha ? &src_alpha_line[(x>>16)] : 0 ;
 466              dest_pixel[0] = src_pixel[0];
 467              dest_pixel[1] = src_pixel[1];
 468              dest_pixel[2] = src_pixel[2];
 469              dest_pixel += 3;
 470              if ( source_alpha )
 471                 *(target_alpha++) = *src_alpha_pixel ;
 472              x += x_delta;
 473         }
 474
 475         y += y_delta;
 476     }
 477
 478     // In case this is a cursor, make sure the hotspot is scalled accordingly:
 479     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
 480         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
 481                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X)*width)/old_width);
 482     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
 483         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
 484                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y)*height)/old_height);
 485
 486     return image;
 487 }
 488
 489 wxImage wxImage::Rotate90( bool clockwise ) const
 490 {
 491     wxImage image;
 492
 493     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 494
 495     image.Create( M_IMGDATA->m_height, M_IMGDATA->m_width, false );
 496
 497     unsigned char *data = image.GetData();
 498
 499     wxCHECK_MSG( data, image, wxT("unable to create image") );
 500
 501     unsigned char *source_data = M_IMGDATA->m_data;
 502     unsigned char *target_data;
 503     unsigned char *alpha_data = 0 ;
 504     unsigned char *source_alpha = 0 ;
 505     unsigned char *target_alpha = 0 ;
 506
 507     if (M_IMGDATA->m_hasMask)
 508     {
 509         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 510     }
 511     else
 512     {
 513         source_alpha = M_IMGDATA->m_alpha ;
 514         if ( source_alpha )
 515         {
 516             image.SetAlpha() ;
 517             alpha_data = image.GetAlpha() ;
 518         }
 519     }
 520
 521     long height = M_IMGDATA->m_height;
 522     long width  = M_IMGDATA->m_width;
 523
 524     for (long j = 0; j < height; j++)
 525     {
 526         for (long i = 0; i < width; i++)
 527         {
 528             if (clockwise)
 529             {
 530                 target_data = data + (((i+1)*height) - j - 1)*3;
 531                 if(source_alpha)
 532                     target_alpha = alpha_data + (((i+1)*height) - j - 1);
 533             }
 534             else
 535             {
 536                 target_data = data + ((height*(width-1)) + j - (i*height))*3;
 537                 if(source_alpha)
 538                     target_alpha = alpha_data + ((height*(width-1)) + j - (i*height));
 539             }
 540             memcpy( target_data, source_data, 3 );
 541             source_data += 3;
 542
 543             if(source_alpha)
 544             {
 545                 memcpy( target_alpha, source_alpha, 1 );
 546                 source_alpha += 1;
 547             }
 548         }
 549     }
 550
 551     return image;
 552 }
 553
 554 wxImage wxImage::Mirror( bool horizontally ) const
 555 {
 556     wxImage image;
 557
 558     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 559
 560     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 561
 562     unsigned char *data = image.GetData();
 563
 564     wxCHECK_MSG( data, image, wxT("unable to create image") );
 565
 566     if (M_IMGDATA->m_hasMask)
 567         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 568
 569     long height = M_IMGDATA->m_height;
 570     long width  = M_IMGDATA->m_width;
 571
 572     unsigned char *source_data = M_IMGDATA->m_data;
 573     unsigned char *target_data;
 574
 575     if (horizontally)
 576     {
 577         for (long j = 0; j < height; j++)
 578         {
 579             data += width*3;
 580             target_data = data-3;
 581             for (long i = 0; i < width; i++)
 582             {
 583                 memcpy( target_data, source_data, 3 );
 584                 source_data += 3;
 585                 target_data -= 3;
 586             }
 587         }
 588     }
 589     else
 590     {
 591         for (long i = 0; i < height; i++)
 592         {
 593             target_data = data + 3*width*(height-1-i);
 594             memcpy( target_data, source_data, (size_t)3*width );
 595             source_data += 3*width;
 596         }
 597     }
 598
 599     return image;
 600 }
 601
 602 wxImage wxImage::GetSubImage( const wxRect &rect ) const
 603 {
 604     wxImage image;
 605
 606     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 607
 608     wxCHECK_MSG( (rect.GetLeft()>=0) && (rect.GetTop()>=0) && (rect.GetRight()<=GetWidth()) && (rect.GetBottom()<=GetHeight()),
 609                  image, wxT("invalid subimage size") );
 610
 611     int subwidth=rect.GetWidth();
 612     const int subheight=rect.GetHeight();
 613
 614     image.Create( subwidth, subheight, false );
 615
 616     unsigned char *subdata = image.GetData(), *data=GetData();
 617
 618     wxCHECK_MSG( subdata, image, wxT("unable to create image") );
 619
 620     if (M_IMGDATA->m_hasMask)
 621         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 622
 623     const int subleft=3*rect.GetLeft();
 624     const int width=3*GetWidth();
 625     subwidth*=3;
 626
 627     data+=rect.GetTop()*width+subleft;
 628
 629     for (long j = 0; j < subheight; ++j)
 630     {
 631         memcpy( subdata, data, subwidth);
 632         subdata+=subwidth;
 633         data+=width;
 634     }
 635
 636     return image;
 637 }
 638
 639 wxImage wxImage::Size( const wxSize& size, const wxPoint& pos,
 640                        int r_, int g_, int b_ ) const
 641 {
 642     wxImage image;
 643
 644     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 645     wxCHECK_MSG( (size.GetWidth() > 0) && (size.GetHeight() > 0), image, wxT("invalid size") );
 646
 647     int width = GetWidth(), height = GetHeight();
 648     image.Create(size.GetWidth(), size.GetHeight(), false);
 649
 650     unsigned char r = (unsigned char)r_;
 651     unsigned char g = (unsigned char)g_;
 652     unsigned char b = (unsigned char)b_;
 653     if ((r_ == -1) && (g_ == -1) && (b_ == -1))
 654     {
 655         GetOrFindMaskColour( &r, &g, &b );
 656         image.SetMaskColour(r, g, b);
 657     }
 658
 659     image.SetRGB(wxRect(), r, g, b);
 660
 661     wxRect subRect(pos.x, pos.y, width, height);
 662     wxRect finalRect(0, 0, size.GetWidth(), size.GetHeight());
 663
 664     subRect.Intersect(finalRect);
 665
 666     if (!subRect.IsEmpty())
 667     {
 668         if ((subRect.GetWidth() == width) && (subRect.GetHeight() == height))
 669             image.Paste(*this, pos.x, pos.y);
 670         else
 671             image.Paste(GetSubImage(subRect), pos.x, pos.y);
 672     }
 673
 674     return image;
 675 }
 676
 677 void wxImage::Paste( const wxImage &image, int x, int y )
 678 {
 679     wxCHECK_RET( Ok(), wxT("invalid image") );
 680     wxCHECK_RET( image.Ok(), wxT("invalid image") );
 681
 682     int xx = 0;
 683     int yy = 0;
 684     int width = image.GetWidth();
 685     int height = image.GetHeight();
 686
 687     if (x < 0)
 688     {
 689         xx = -x;
 690         width += x;
 691     }
 692     if (y < 0)
 693     {
 694         yy = -y;
 695         height += y;
 696     }
 697
 698     if ((x+xx)+width > M_IMGDATA->m_width)
 699         width = M_IMGDATA->m_width - (x+xx);
 700     if ((y+yy)+height > M_IMGDATA->m_height)
 701         height = M_IMGDATA->m_height - (y+yy);
 702
 703     if (width < 1) return;
 704     if (height < 1) return;
 705
 706     if ((!HasMask() && !image.HasMask()) ||
 707         (HasMask() && !image.HasMask()) ||
 708        ((HasMask() && image.HasMask() &&
 709          (GetMaskRed()==image.GetMaskRed()) &&
 710          (GetMaskGreen()==image.GetMaskGreen()) &&
 711          (GetMaskBlue()==image.GetMaskBlue()))))
 712     {
 713         width *= 3;
 714         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 715         int source_step = image.GetWidth()*3;
 716
 717         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 718         int target_step = M_IMGDATA->m_width*3;
 719         for (int j = 0; j < height; j++)
 720         {
 721             memcpy( target_data, source_data, width );
 722             source_data += source_step;
 723             target_data += target_step;
 724         }
 725         return;
 726     }
 727
 728     if (!HasMask() && image.HasMask())
 729     {
 730         unsigned char r = image.GetMaskRed();
 731         unsigned char g = image.GetMaskGreen();
 732         unsigned char b = image.GetMaskBlue();
 733
 734         width *= 3;
 735         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 736         int source_step = image.GetWidth()*3;
 737
 738         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 739         int target_step = M_IMGDATA->m_width*3;
 740
 741         for (int j = 0; j < height; j++)
 742         {
 743             for (int i = 0; i < width; i+=3)
 744             {
 745                 if ((source_data[i]   != r) &&
 746                     (source_data[i+1] != g) &&
 747                     (source_data[i+2] != b))
 748                 {
 749                     memcpy( target_data+i, source_data+i, 3 );
 750                 }
 751             }
 752             source_data += source_step;
 753             target_data += target_step;
 754         }
 755     }
 756 }
 757
 758 void wxImage::Replace( unsigned char r1, unsigned char g1, unsigned char b1,
 759                        unsigned char r2, unsigned char g2, unsigned char b2 )
 760 {
 761     wxCHECK_RET( Ok(), wxT("invalid image") );
 762
 763     unsigned char *data = GetData();
 764
 765     const int w = GetWidth();
 766     const int h = GetHeight();
 767
 768     for (int j = 0; j < h; j++)
 769         for (int i = 0; i < w; i++)
 770         {
 771             if ((data[0] == r1) && (data[1] == g1) && (data[2] == b1))
 772             {
 773                 data[0] = r2;
 774                 data[1] = g2;
 775                 data[2] = b2;
 776             }
 777             data += 3;
 778         }
 779 }
 780
 781 wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const
 782 {
 783     wxImage image;
 784
 785     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 786
 787     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 788
 789     unsigned char *data = image.GetData();
 790
 791     wxCHECK_MSG( data, image, wxT("unable to create image") );
 792
 793     if (M_IMGDATA->m_hasMask)
 794     {
 795         if (M_IMGDATA->m_maskRed == r && M_IMGDATA->m_maskGreen == g &&
 796                                          M_IMGDATA->m_maskBlue == b)
 797             image.SetMaskColour( 255, 255, 255 );
 798         else
 799             image.SetMaskColour( 0, 0, 0 );
 800     }
 801
 802     long size = M_IMGDATA->m_height * M_IMGDATA->m_width;
 803
 804     unsigned char *srcd = M_IMGDATA->m_data;
 805     unsigned char *tard = image.GetData();
 806
 807     for ( long i = 0; i < size; i++, srcd += 3, tard += 3 )
 808     {
 809         if (srcd[0] == r && srcd[1] == g && srcd[2] == b)
 810             tard[0] = tard[1] = tard[2] = 255;
 811         else
 812             tard[0] = tard[1] = tard[2] = 0;
 813     }
 814
 815     return image;
 816 }
 817
 818 int wxImage::GetWidth() const
 819 {
 820     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 821
 822     return M_IMGDATA->m_width;
 823 }
 824
 825 int wxImage::GetHeight() const
 826 {
 827     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 828
 829     return M_IMGDATA->m_height;
 830 }
 831
 832 long wxImage::XYToIndex(int x, int y) const
 833 {
 834     if ( Ok() &&
 835             x >= 0 && y >= 0 &&
 836                 x < M_IMGDATA->m_width && y < M_IMGDATA->m_height )
 837     {
 838         return y*M_IMGDATA->m_width + x;
 839     }
 840
 841     return -1;
 842 }
 843
 844 void wxImage::SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b )
 845 {
 846     long pos = XYToIndex(x, y);
 847     wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
 848
 849     pos *= 3;
 850
 851     M_IMGDATA->m_data[ pos   ] = r;
 852     M_IMGDATA->m_data[ pos+1 ] = g;
 853     M_IMGDATA->m_data[ pos+2 ] = b;
 854 }
 855
 856 void wxImage::SetRGB( const wxRect& rect_, unsigned char r, unsigned char g, unsigned char b )
 857 {
 858     wxCHECK_RET( Ok(), wxT("invalid image") );
 859
 860     wxRect rect(rect_);
 861     wxRect imageRect(0, 0, GetWidth(), GetHeight());
 862     if ( rect == wxRect() )
 863     {
 864         rect = imageRect;
 865     }
 866     else
 867     {
 868         wxCHECK_RET( imageRect.Inside(rect.GetTopLeft()) &&
 869                      imageRect.Inside(rect.GetBottomRight()),
 870                      wxT("invalid bounding rectangle") );
 871     }
 872
 873     int x1 = rect.GetLeft(),
 874         y1 = rect.GetTop(),
 875         x2 = rect.GetRight() + 1,
 876         y2 = rect.GetBottom() + 1;
 877
 878     unsigned char *data wxDUMMY_INITIALIZE(NULL);
 879     int x, y, width = GetWidth();
 880     for (y = y1; y < y2; y++)
 881     {
 882         data = M_IMGDATA->m_data + (y*width + x1)*3;
 883         for (x = x1; x < x2; x++)
 884         {
 885             *data++ = r;
 886             *data++ = g;
 887             *data++ = b;
 888         }
 889     }
 890 }
 891
 892 unsigned char wxImage::GetRed( int x, int y ) const
 893 {
 894     long pos = XYToIndex(x, y);
 895     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
 896
 897     pos *= 3;
 898
 899     return M_IMGDATA->m_data[pos];
 900 }
 901
 902 unsigned char wxImage::GetGreen( int x, int y ) const
 903 {
 904     long pos = XYToIndex(x, y);
 905     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
 906
 907     pos *= 3;
 908
 909     return M_IMGDATA->m_data[pos+1];
 910 }
 911
 912 unsigned char wxImage::GetBlue( int x, int y ) const
 913 {
 914     long pos = XYToIndex(x, y);
 915     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
 916
 917     pos *= 3;
 918
 919     return M_IMGDATA->m_data[pos+2];
 920 }
 921
 922 bool wxImage::Ok() const
 923 {
 924     // image of 0 width or height can't be considered ok - at least because it
 925     // causes crashes in ConvertToBitmap() if we don't catch it in time
 926     wxImageRefData *data = M_IMGDATA;
 927     return data && data->m_ok && data->m_width && data->m_height;
 928 }
 929
 930 unsigned char *wxImage::GetData() const
 931 {
 932     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
 933
 934     return M_IMGDATA->m_data;
 935 }
 936
 937 void wxImage::SetData( unsigned char *data, bool static_data  )
 938 {
 939     wxCHECK_RET( Ok(), wxT("invalid image") );
 940
 941     wxImageRefData *newRefData = new wxImageRefData();
 942
 943     newRefData->m_width = M_IMGDATA->m_width;
 944     newRefData->m_height = M_IMGDATA->m_height;
 945     newRefData->m_data = data;
 946     newRefData->m_ok = true;
 947     newRefData->m_maskRed = M_IMGDATA->m_maskRed;
 948     newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
 949     newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
 950     newRefData->m_hasMask = M_IMGDATA->m_hasMask;
 951     newRefData->m_static = static_data;
 952
 953     UnRef();
 954
 955     m_refData = newRefData;
 956 }
 957
 958 void wxImage::SetData( unsigned char *data, int new_width, int new_height, bool static_data )
 959 {
 960     wxImageRefData *newRefData = new wxImageRefData();
 961
 962     if (m_refData)
 963     {
 964         newRefData->m_width = new_width;
 965         newRefData->m_height = new_height;
 966         newRefData->m_data = data;
 967         newRefData->m_ok = true;
 968         newRefData->m_maskRed = M_IMGDATA->m_maskRed;
 969         newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
 970         newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
 971         newRefData->m_hasMask = M_IMGDATA->m_hasMask;
 972     }
 973     else
 974     {
 975         newRefData->m_width = new_width;
 976         newRefData->m_height = new_height;
 977         newRefData->m_data = data;
 978         newRefData->m_ok = true;
 979     }
 980     newRefData->m_static = static_data;
 981
 982     UnRef();
 983
 984     m_refData = newRefData;
 985 }
 986
 987 // ----------------------------------------------------------------------------
 988 // alpha channel support
 989 // ----------------------------------------------------------------------------
 990
 991 void wxImage::SetAlpha(int x, int y, unsigned char alpha)
 992 {
 993     wxCHECK_RET( HasAlpha(), wxT("no alpha channel") );
 994
 995     long pos = XYToIndex(x, y);
 996     wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
 997
 998     M_IMGDATA->m_alpha[pos] = alpha;
 999 }
1000
1001 unsigned char wxImage::GetAlpha(int x, int y) const
1002 {
1003     wxCHECK_MSG( HasAlpha(), 0, wxT("no alpha channel") );
1004
1005     long pos = XYToIndex(x, y);
1006     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
1007
1008     return M_IMGDATA->m_alpha[pos];
1009 }
1010
1011 bool
1012 wxImage::ConvertColourToAlpha(unsigned char r, unsigned char g, unsigned char b)
1013 {
1014     SetAlpha(NULL);
1015
1016     const int w = M_IMGDATA->m_width;
1017     const int h = M_IMGDATA->m_height;
1018
1019     unsigned char *alpha = GetAlpha();
1020     unsigned char *data = GetData();
1021
1022     for ( int y = 0; y < h; y++ )
1023     {
1024         for ( int x = 0; x < w; x++ )
1025         {
1026             *alpha++ = *data;
1027             *data++ = r;
1028             *data++ = g;
1029             *data++ = b;
1030         }
1031     }
1032
1033     return true;
1034 }
1035
1036 void wxImage::SetAlpha( unsigned char *alpha, bool static_data )
1037 {
1038     wxCHECK_RET( Ok(), wxT("invalid image") );
1039
1040     if ( !alpha )
1041     {
1042         alpha = (unsigned char *)malloc(M_IMGDATA->m_width*M_IMGDATA->m_height);
1043     }
1044
1045     free(M_IMGDATA->m_alpha);
1046     M_IMGDATA->m_alpha = alpha;
1047     M_IMGDATA->m_staticAlpha = static_data;
1048 }
1049
1050 unsigned char *wxImage::GetAlpha() const
1051 {
1052     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
1053
1054     return M_IMGDATA->m_alpha;
1055 }
1056
1057 void wxImage::InitAlpha()
1058 {
1059     wxCHECK_RET( !HasAlpha(), wxT("image already has an alpha channel") );
1060
1061     // initialize memory for alpha channel
1062     SetAlpha();
1063
1064     unsigned char *alpha = M_IMGDATA->m_alpha;
1065     const size_t lenAlpha = M_IMGDATA->m_width * M_IMGDATA->m_height;
1066
1067     if ( HasMask() )
1068     {
1069         // use the mask to initialize the alpha channel.
1070         const unsigned char * const alphaEnd = alpha + lenAlpha;
1071
1072         const unsigned char mr = M_IMGDATA->m_maskRed;
1073         const unsigned char mg = M_IMGDATA->m_maskGreen;
1074         const unsigned char mb = M_IMGDATA->m_maskBlue;
1075         for ( unsigned char *src = M_IMGDATA->m_data;
1076               alpha < alphaEnd;
1077               src += 3, alpha++ )
1078         {
1079             *alpha = (src[0] == mr && src[1] == mg && src[2] == mb)
1080                             ? wxIMAGE_ALPHA_TRANSPARENT
1081                             : wxIMAGE_ALPHA_OPAQUE;
1082         }
1083
1084         M_IMGDATA->m_hasMask = false;
1085     }
1086     else // no mask
1087     {
1088         // make the image fully opaque
1089         memset(alpha, wxIMAGE_ALPHA_OPAQUE, lenAlpha);
1090     }
1091 }
1092
1093 // ----------------------------------------------------------------------------
1094 // mask support
1095 // ----------------------------------------------------------------------------
1096
1097 void wxImage::SetMaskColour( unsigned char r, unsigned char g, unsigned char b )
1098 {
1099     wxCHECK_RET( Ok(), wxT("invalid image") );
1100
1101     M_IMGDATA->m_maskRed = r;
1102     M_IMGDATA->m_maskGreen = g;
1103     M_IMGDATA->m_maskBlue = b;
1104     M_IMGDATA->m_hasMask = true;
1105 }
1106
1107 bool wxImage::GetOrFindMaskColour( unsigned char *r, unsigned char *g, unsigned char *b ) const
1108 {
1109     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1110
1111     if (M_IMGDATA->m_hasMask)
1112     {
1113         if (r) *r = M_IMGDATA->m_maskRed;
1114         if (g) *g = M_IMGDATA->m_maskGreen;
1115         if (b) *b = M_IMGDATA->m_maskBlue;
1116         return true;
1117     }
1118     else
1119     {
1120         FindFirstUnusedColour(r, g, b);
1121         return false;
1122     }
1123 }
1124
1125 unsigned char wxImage::GetMaskRed() const
1126 {
1127     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1128
1129     return M_IMGDATA->m_maskRed;
1130 }
1131
1132 unsigned char wxImage::GetMaskGreen() const
1133 {
1134     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1135
1136     return M_IMGDATA->m_maskGreen;
1137 }
1138
1139 unsigned char wxImage::GetMaskBlue() const
1140 {
1141     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1142
1143     return M_IMGDATA->m_maskBlue;
1144 }
1145
1146 void wxImage::SetMask( bool mask )
1147 {
1148     wxCHECK_RET( Ok(), wxT("invalid image") );
1149
1150     M_IMGDATA->m_hasMask = mask;
1151 }
1152
1153 bool wxImage::HasMask() const
1154 {
1155     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1156
1157     return M_IMGDATA->m_hasMask;
1158 }
1159
1160 bool wxImage::IsTransparent(int x, int y, unsigned char threshold) const
1161 {
1162     long pos = XYToIndex(x, y);
1163     wxCHECK_MSG( pos != -1, false, wxT("invalid image coordinates") );
1164
1165     // check mask
1166     if ( M_IMGDATA->m_hasMask )
1167     {
1168         const unsigned char *p = M_IMGDATA->m_data + 3*pos;
1169         if ( p[0] == M_IMGDATA->m_maskRed &&
1170                 p[1] == M_IMGDATA->m_maskGreen &&
1171                     p[2] == M_IMGDATA->m_maskBlue )
1172         {
1173             return true;
1174         }
1175     }
1176
1177     // then check alpha
1178     if ( M_IMGDATA->m_alpha )
1179     {
1180         if ( M_IMGDATA->m_alpha[pos] < threshold )
1181         {
1182             // transparent enough
1183             return true;
1184         }
1185     }
1186
1187     // not transparent
1188     return false;
1189 }
1190
1191 bool wxImage::SetMaskFromImage(const wxImage& mask,
1192                                unsigned char mr, unsigned char mg, unsigned char mb)
1193 {
1194     // check that the images are the same size
1195     if ( (M_IMGDATA->m_height != mask.GetHeight() ) || (M_IMGDATA->m_width != mask.GetWidth () ) )
1196     {
1197         wxLogError( _("Image and mask have different sizes.") );
1198         return false;
1199     }
1200
1201     // find unused colour
1202     unsigned char r,g,b ;
1203     if (!FindFirstUnusedColour(&r, &g, &b))
1204     {
1205         wxLogError( _("No unused colour in image being masked.") );
1206         return false ;
1207     }
1208
1209     unsigned char *imgdata = GetData();
1210     unsigned char *maskdata = mask.GetData();
1211
1212     const int w = GetWidth();
1213     const int h = GetHeight();
1214
1215     for (int j = 0; j < h; j++)
1216     {
1217         for (int i = 0; i < w; i++)
1218         {
1219             if ((maskdata[0] == mr) && (maskdata[1]  == mg) && (maskdata[2] == mb))
1220             {
1221                 imgdata[0] = r;
1222                 imgdata[1] = g;
1223                 imgdata[2] = b;
1224             }
1225             imgdata  += 3;
1226             maskdata += 3;
1227         }
1228     }
1229
1230     SetMaskColour(r, g, b);
1231     SetMask(true);
1232
1233     return true;
1234 }
1235
1236 bool wxImage::ConvertAlphaToMask(unsigned char threshold)
1237 {
1238     if (!HasAlpha())
1239         return true;
1240
1241     unsigned char mr, mg, mb;
1242     if (!FindFirstUnusedColour(&mr, &mg, &mb))
1243     {
1244         wxLogError( _("No unused colour in image being masked.") );
1245         return false;
1246     }
1247
1248     SetMask(true);
1249     SetMaskColour(mr, mg, mb);
1250
1251     unsigned char *imgdata = GetData();
1252     unsigned char *alphadata = GetAlpha();
1253
1254     int w = GetWidth();
1255     int h = GetHeight();
1256
1257     for (int y = 0; y < h; y++)
1258     {
1259         for (int x = 0; x < w; x++, imgdata += 3, alphadata++)
1260         {
1261             if (*alphadata < threshold)
1262             {
1263                 imgdata[0] = mr;
1264                 imgdata[1] = mg;
1265                 imgdata[2] = mb;
1266             }
1267         }
1268     }
1269
1270     free(M_IMGDATA->m_alpha);
1271     M_IMGDATA->m_alpha = NULL;
1272
1273     return true;
1274 }
1275
1276 // ----------------------------------------------------------------------------
1277 // Palette functions
1278 // ----------------------------------------------------------------------------
1279
1280 #if wxUSE_PALETTE
1281
1282 bool wxImage::HasPalette() const
1283 {
1284     if (!Ok())
1285         return false;
1286
1287     return M_IMGDATA->m_palette.Ok();
1288 }
1289
1290 const wxPalette& wxImage::GetPalette() const
1291 {
1292     wxCHECK_MSG( Ok(), wxNullPalette, wxT("invalid image") );
1293
1294     return M_IMGDATA->m_palette;
1295 }
1296
1297 void wxImage::SetPalette(const wxPalette& palette)
1298 {
1299     wxCHECK_RET( Ok(), wxT("invalid image") );
1300
1301     M_IMGDATA->m_palette = palette;
1302 }
1303
1304 #endif // wxUSE_PALETTE
1305
1306 // ----------------------------------------------------------------------------
1307 // Option functions (arbitrary name/value mapping)
1308 // ----------------------------------------------------------------------------
1309
1310 void wxImage::SetOption(const wxString& name, const wxString& value)
1311 {
1312     wxCHECK_RET( Ok(), wxT("invalid image") );
1313
1314     int idx = M_IMGDATA->m_optionNames.Index(name, false);
1315     if (idx == wxNOT_FOUND)
1316     {
1317         M_IMGDATA->m_optionNames.Add(name);
1318         M_IMGDATA->m_optionValues.Add(value);
1319     }
1320     else
1321     {
1322         M_IMGDATA->m_optionNames[idx] = name;
1323         M_IMGDATA->m_optionValues[idx] = value;
1324     }
1325 }
1326
1327 void wxImage::SetOption(const wxString& name, int value)
1328 {
1329     wxString valStr;
1330     valStr.Printf(wxT("%d"), value);
1331     SetOption(name, valStr);
1332 }
1333
1334 wxString wxImage::GetOption(const wxString& name) const
1335 {
1336     wxCHECK_MSG( Ok(), wxEmptyString, wxT("invalid image") );
1337
1338     int idx = M_IMGDATA->m_optionNames.Index(name, false);
1339     if (idx == wxNOT_FOUND)
1340         return wxEmptyString;
1341     else
1342         return M_IMGDATA->m_optionValues[idx];
1343 }
1344
1345 int wxImage::GetOptionInt(const wxString& name) const
1346 {
1347     return wxAtoi(GetOption(name));
1348 }
1349
1350 bool wxImage::HasOption(const wxString& name) const
1351 {
1352     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1353
1354     return (M_IMGDATA->m_optionNames.Index(name, false) != wxNOT_FOUND);
1355 }
1356
1357 // ----------------------------------------------------------------------------
1358 // image I/O
1359 // ----------------------------------------------------------------------------
1360
1361 bool wxImage::LoadFile( const wxString& filename, long type, int index )
1362 {
1363 #if wxUSE_STREAMS
1364     if (wxFileExists(filename))
1365     {
1366         wxFileInputStream stream(filename);
1367         wxBufferedInputStream bstream( stream );
1368         return LoadFile(bstream, type, index);
1369     }
1370     else
1371     {
1372         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
1373
1374         return false;
1375     }
1376 #else // !wxUSE_STREAMS
1377     return false;
1378 #endif // wxUSE_STREAMS
1379 }
1380
1381 bool wxImage::LoadFile( const wxString& filename, const wxString& mimetype, int index )
1382 {
1383 #if wxUSE_STREAMS
1384     if (wxFileExists(filename))
1385     {
1386         wxFileInputStream stream(filename);
1387         wxBufferedInputStream bstream( stream );
1388         return LoadFile(bstream, mimetype, index);
1389     }
1390     else
1391     {
1392         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
1393
1394         return false;
1395     }
1396 #else // !wxUSE_STREAMS
1397     return false;
1398 #endif // wxUSE_STREAMS
1399 }
1400
1401
1402
1403 bool wxImage::SaveFile( const wxString& filename ) const
1404 {
1405     wxString ext = filename.AfterLast('.').Lower();
1406
1407     wxImageHandler * pHandler = FindHandler(ext, -1);
1408     if (pHandler)
1409     {
1410         SaveFile(filename, pHandler->GetType());
1411         return true;
1412     }
1413
1414     wxLogError(_("Can't save image to file '%s': unknown extension."), filename.c_str());
1415
1416     return false;
1417 }
1418
1419 bool wxImage::SaveFile( const wxString& filename, int type ) const
1420 {
1421 #if wxUSE_STREAMS
1422     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1423
1424     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
1425
1426     wxFileOutputStream stream(filename);
1427
1428     if ( stream.IsOk() )
1429     {
1430         wxBufferedOutputStream bstream( stream );
1431         return SaveFile(bstream, type);
1432     }
1433 #endif // wxUSE_STREAMS
1434
1435     return false;
1436 }
1437
1438 bool wxImage::SaveFile( const wxString& filename, const wxString& mimetype ) const
1439 {
1440 #if wxUSE_STREAMS
1441     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1442
1443     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
1444
1445     wxFileOutputStream stream(filename);
1446
1447     if ( stream.IsOk() )
1448     {
1449         wxBufferedOutputStream bstream( stream );
1450         return SaveFile(bstream, mimetype);
1451     }
1452 #endif // wxUSE_STREAMS
1453
1454     return false;
1455 }
1456
1457 bool wxImage::CanRead( const wxString &name )
1458 {
1459 #if wxUSE_STREAMS
1460   wxFileInputStream stream(name);
1461   return CanRead(stream);
1462 #else
1463   return false;
1464 #endif
1465 }
1466
1467 int wxImage::GetImageCount( const wxString &name, long type )
1468 {
1469 #if wxUSE_STREAMS
1470   wxFileInputStream stream(name);
1471   if (stream.Ok())
1472       return GetImageCount(stream, type);
1473 #endif
1474
1475   return 0;
1476 }
1477
1478 #if wxUSE_STREAMS
1479
1480 bool wxImage::CanRead( wxInputStream &stream )
1481 {
1482     const wxList& list = GetHandlers();
1483
1484     for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
1485     {
1486         wxImageHandler *handler=(wxImageHandler*)node->GetData();
1487         if (handler->CanRead( stream ))
1488             return true;
1489     }
1490
1491     return false;
1492 }
1493
1494 int wxImage::GetImageCount( wxInputStream &stream, long type )
1495 {
1496     wxImageHandler *handler;
1497
1498     if ( type == wxBITMAP_TYPE_ANY )
1499     {
1500         wxList &list=GetHandlers();
1501
1502         for (wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext())
1503         {
1504              handler=(wxImageHandler*)node->GetData();
1505              if ( handler->CanRead(stream) )
1506                  return handler->GetImageCount(stream);
1507
1508         }
1509
1510         wxLogWarning(_("No handler found for image type."));
1511         return 0;
1512     }
1513
1514     handler = FindHandler(type);
1515
1516     if ( !handler )
1517     {
1518         wxLogWarning(_("No image handler for type %d defined."), type);
1519         return false;
1520     }
1521
1522     if ( handler->CanRead(stream) )
1523     {
1524         return handler->GetImageCount(stream);
1525     }
1526     else
1527     {
1528         wxLogError(_("Image file is not of type %d."), type);
1529         return 0;
1530     }
1531 }
1532
1533 bool wxImage::LoadFile( wxInputStream& stream, long type, int index )
1534 {
1535     UnRef();
1536
1537     m_refData = new wxImageRefData;
1538
1539     wxImageHandler *handler;
1540
1541     if ( type == wxBITMAP_TYPE_ANY )
1542     {
1543         wxList &list=GetHandlers();
1544
1545         for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
1546         {
1547              handler=(wxImageHandler*)node->GetData();
1548              if ( handler->CanRead(stream) )
1549                  return handler->LoadFile(this, stream, true/*verbose*/, index);
1550
1551         }
1552
1553         wxLogWarning( _("No handler found for image type.") );
1554         return false;
1555     }
1556
1557     handler = FindHandler(type);
1558
1559     if (handler == 0)
1560     {
1561         wxLogWarning( _("No image handler for type %d defined."), type );
1562
1563         return false;
1564     }
1565
1566     return handler->LoadFile(this, stream, true/*verbose*/, index);
1567 }
1568
1569 bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int index )
1570 {
1571     UnRef();
1572
1573     m_refData = new wxImageRefData;
1574
1575     wxImageHandler *handler = FindHandlerMime(mimetype);
1576
1577     if (handler == 0)
1578     {
1579         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1580
1581         return false;
1582     }
1583
1584     return handler->LoadFile( this, stream, true/*verbose*/, index );
1585 }
1586
1587 bool wxImage::SaveFile( wxOutputStream& stream, int type ) const
1588 {
1589     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1590
1591     wxImageHandler *handler = FindHandler(type);
1592     if ( !handler )
1593     {
1594         wxLogWarning( _("No image handler for type %d defined."), type );
1595
1596         return false;
1597     }
1598
1599     return handler->SaveFile( (wxImage*)this, stream );
1600 }
1601
1602 bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype ) const
1603 {
1604     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1605
1606     wxImageHandler *handler = FindHandlerMime(mimetype);
1607     if ( !handler )
1608     {
1609         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1610
1611         return false;
1612     }
1613
1614     return handler->SaveFile( (wxImage*)this, stream );
1615 }
1616 #endif // wxUSE_STREAMS
1617
1618 // ----------------------------------------------------------------------------
1619 // image I/O handlers
1620 // ----------------------------------------------------------------------------
1621
1622 void wxImage::AddHandler( wxImageHandler *handler )
1623 {
1624     // Check for an existing handler of the type being added.
1625     if (FindHandler( handler->GetType() ) == 0)
1626     {
1627         sm_handlers.Append( handler );
1628     }
1629     else
1630     {
1631         // This is not documented behaviour, merely the simplest 'fix'
1632         // for preventing duplicate additions.  If someone ever has
1633         // a good reason to add and remove duplicate handlers (and they
1634         // may) we should probably refcount the duplicates.
1635         //   also an issue in InsertHandler below.
1636
1637         wxLogDebug( _T("Adding duplicate image handler for '%s'"),
1638                     handler->GetName().c_str() );
1639         delete handler;
1640     }
1641 }
1642
1643 void wxImage::InsertHandler( wxImageHandler *handler )
1644 {
1645     // Check for an existing handler of the type being added.
1646     if (FindHandler( handler->GetType() ) == 0)
1647     {
1648         sm_handlers.Insert( handler );
1649     }
1650     else
1651     {
1652         // see AddHandler for additional comments.
1653         wxLogDebug( _T("Inserting duplicate image handler for '%s'"),
1654                     handler->GetName().c_str() );
1655         delete handler;
1656     }
1657 }
1658
1659 bool wxImage::RemoveHandler( const wxString& name )
1660 {
1661     wxImageHandler *handler = FindHandler(name);
1662     if (handler)
1663     {
1664         sm_handlers.DeleteObject(handler);
1665         delete handler;
1666         return true;
1667     }
1668     else
1669         return false;
1670 }
1671
1672 wxImageHandler *wxImage::FindHandler( const wxString& name )
1673 {
1674     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1675     while (node)
1676     {
1677         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1678         if (handler->GetName().Cmp(name) == 0) return handler;
1679
1680         node = node->GetNext();
1681     }
1682     return 0;
1683 }
1684
1685 wxImageHandler *wxImage::FindHandler( const wxString& extension, long bitmapType )
1686 {
1687     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1688     while (node)
1689     {
1690         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1691         if ( (handler->GetExtension().Cmp(extension) == 0) &&
1692             (bitmapType == -1 || handler->GetType() == bitmapType) )
1693             return handler;
1694         node = node->GetNext();
1695     }
1696     return 0;
1697 }
1698
1699 wxImageHandler *wxImage::FindHandler( long bitmapType )
1700 {
1701     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1702     while (node)
1703     {
1704         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1705         if (handler->GetType() == bitmapType) return handler;
1706         node = node->GetNext();
1707     }
1708     return 0;
1709 }
1710
1711 wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype )
1712 {
1713     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1714     while (node)
1715     {
1716         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1717         if (handler->GetMimeType().IsSameAs(mimetype, false)) return handler;
1718         node = node->GetNext();
1719     }
1720     return 0;
1721 }
1722
1723 void wxImage::InitStandardHandlers()
1724 {
1725 #if wxUSE_STREAMS
1726     AddHandler(new wxBMPHandler);
1727 #endif // wxUSE_STREAMS
1728 }
1729
1730 void wxImage::CleanUpHandlers()
1731 {
1732     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1733     while (node)
1734     {
1735         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1736         wxList::compatibility_iterator next = node->GetNext();
1737         delete handler;
1738         node = next;
1739     }
1740
1741     sm_handlers.Clear();
1742 }
1743
1744 wxString wxImage::GetImageExtWildcard()
1745 {
1746     wxString fmts;
1747
1748     wxList& Handlers = wxImage::GetHandlers();
1749     wxList::compatibility_iterator Node = Handlers.GetFirst();
1750     while ( Node )
1751     {
1752         wxImageHandler* Handler = (wxImageHandler*)Node->GetData();
1753         fmts += wxT("*.") + Handler->GetExtension();
1754         Node = Node->GetNext();
1755         if ( Node ) fmts += wxT(";");
1756     }
1757
1758     return wxT("(") + fmts + wxT(")|") + fmts;
1759 }
1760
1761 //-----------------------------------------------------------------------------
1762 // wxImageHandler
1763 //-----------------------------------------------------------------------------
1764
1765 IMPLEMENT_ABSTRACT_CLASS(wxImageHandler,wxObject)
1766
1767 #if wxUSE_STREAMS
1768 bool wxImageHandler::LoadFile( wxImage *WXUNUSED(image), wxInputStream& WXUNUSED(stream), bool WXUNUSED(verbose), int WXUNUSED(index) )
1769 {
1770     return false;
1771 }
1772
1773 bool wxImageHandler::SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream), bool WXUNUSED(verbose) )
1774 {
1775     return false;
1776 }
1777
1778 int wxImageHandler::GetImageCount( wxInputStream& WXUNUSED(stream) )
1779 {
1780     return 1;
1781 }
1782
1783 bool wxImageHandler::CanRead( const wxString& name )
1784 {
1785     if (wxFileExists(name))
1786     {
1787         wxFileInputStream stream(name);
1788         return CanRead(stream);
1789     }
1790
1791     wxLogError( _("Can't check image format of file '%s': file does not exist."), name.c_str() );
1792
1793     return false;
1794 }
1795
1796 bool wxImageHandler::CallDoCanRead(wxInputStream& stream)
1797 {
1798     wxFileOffset posOld = stream.TellI();
1799     if ( posOld == wxInvalidOffset )
1800     {
1801         // can't test unseekable stream
1802         return false;
1803     }
1804
1805     bool ok = DoCanRead(stream);
1806
1807     // restore the old position to be able to test other formats and so on
1808     if ( stream.SeekI(posOld) == wxInvalidOffset )
1809     {
1810         wxLogDebug(_T("Failed to rewind the stream in wxImageHandler!"));
1811
1812         // reading would fail anyhow as we're not at the right position
1813         return false;
1814     }
1815
1816     return ok;
1817 }
1818
1819 #endif // wxUSE_STREAMS
1820
1821 // ----------------------------------------------------------------------------
1822 // image histogram stuff
1823 // ----------------------------------------------------------------------------
1824
1825 bool
1826 wxImageHistogram::FindFirstUnusedColour(unsigned char *r,
1827                                         unsigned char *g,
1828                                         unsigned char *b,
1829                                         unsigned char r2,
1830                                         unsigned char b2,
1831                                         unsigned char g2) const
1832 {
1833     unsigned long key = MakeKey(r2, g2, b2);
1834
1835     while ( find(key) != end() )
1836     {
1837         // color already used
1838         r2++;
1839         if ( r2 >= 255 )
1840         {
1841             r2 = 0;
1842             g2++;
1843             if ( g2 >= 255 )
1844             {
1845                 g2 = 0;
1846                 b2++;
1847                 if ( b2 >= 255 )
1848                 {
1849                     wxLogError(_("No unused colour in image.") );
1850                     return false;
1851                 }
1852             }
1853         }
1854
1855         key = MakeKey(r2, g2, b2);
1856     }
1857
1858     if ( r )
1859         *r = r2;
1860     if ( g )
1861         *g = g2;
1862     if ( b )
1863         *b = b2;
1864
1865     return true;
1866 }
1867
1868 bool
1869 wxImage::FindFirstUnusedColour(unsigned char *r,
1870                                unsigned char *g,
1871                                unsigned char *b,
1872                                unsigned char r2,
1873                                unsigned char b2,
1874                                unsigned char g2) const
1875 {
1876     wxImageHistogram histogram;
1877
1878     ComputeHistogram(histogram);
1879
1880     return histogram.FindFirstUnusedColour(r, g, b, r2, g2, b2);
1881 }
1882
1883
1884
1885 // GRG, Dic/99
1886 // Counts and returns the number of different colours. Optionally stops
1887 // when it exceeds 'stopafter' different colours. This is useful, for
1888 // example, to see if the image can be saved as 8-bit (256 colour or
1889 // less, in this case it would be invoked as CountColours(256)). Default
1890 // value for stopafter is -1 (don't care).
1891 //
1892 unsigned long wxImage::CountColours( unsigned long stopafter ) const
1893 {
1894     wxHashTable h;
1895     wxObject dummy;
1896     unsigned char r, g, b;
1897     unsigned char *p;
1898     unsigned long size, nentries, key;
1899
1900     p = GetData();
1901     size = GetWidth() * GetHeight();
1902     nentries = 0;
1903
1904     for (unsigned long j = 0; (j < size) && (nentries <= stopafter) ; j++)
1905     {
1906         r = *(p++);
1907         g = *(p++);
1908         b = *(p++);
1909         key = wxImageHistogram::MakeKey(r, g, b);
1910
1911         if (h.Get(key) == NULL)
1912         {
1913             h.Put(key, &dummy);
1914             nentries++;
1915         }
1916     }
1917
1918     return nentries;
1919 }
1920
1921
1922 unsigned long wxImage::ComputeHistogram( wxImageHistogram &h ) const
1923 {
1924     unsigned char *p = GetData();
1925     unsigned long nentries = 0;
1926
1927     h.clear();
1928
1929     const unsigned long size = GetWidth() * GetHeight();
1930
1931     unsigned char r, g, b;
1932     for ( unsigned long n = 0; n < size; n++ )
1933     {
1934         r = *p++;
1935         g = *p++;
1936         b = *p++;
1937
1938         wxImageHistogramEntry& entry = h[wxImageHistogram::MakeKey(r, g, b)];
1939
1940         if ( entry.value++ == 0 )
1941             entry.index = nentries++;
1942     }
1943
1944     return nentries;
1945 }
1946
1947 /*
1948  * Rotation code by Carlos Moreno
1949  */
1950
1951 // GRG: I've removed wxRotationPoint - we already have wxRealPoint which
1952 //      does exactly the same thing. And I also got rid of wxRotationPixel
1953 //      bacause of potential problems in architectures where alignment
1954 //      is an issue, so I had to rewrite parts of the code.
1955
1956 static const double gs_Epsilon = 1e-10;
1957
1958 static inline int wxCint (double x)
1959 {
1960     return (x > 0) ? (int) (x + 0.5) : (int) (x - 0.5);
1961 }
1962
1963
1964 // Auxiliary function to rotate a point (x,y) with respect to point p0
1965 // make it inline and use a straight return to facilitate optimization
1966 // also, the function receives the sine and cosine of the angle to avoid
1967 // repeating the time-consuming calls to these functions -- sin/cos can
1968 // be computed and stored in the calling function.
1969
1970 inline wxRealPoint rotated_point (const wxRealPoint & p, double cos_angle, double sin_angle, const wxRealPoint & p0)
1971 {
1972     return wxRealPoint (p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle,
1973                         p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle);
1974 }
1975
1976 inline wxRealPoint rotated_point (double x, double y, double cos_angle, double sin_angle, const wxRealPoint & p0)
1977 {
1978     return rotated_point (wxRealPoint(x,y), cos_angle, sin_angle, p0);
1979 }
1980
1981 wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool interpolating, wxPoint * offset_after_rotation) const
1982 {
1983     int i;
1984     angle = -angle;     // screen coordinates are a mirror image of "real" coordinates
1985
1986     bool has_alpha = HasAlpha();
1987
1988     // Create pointer-based array to accelerate access to wxImage's data
1989     unsigned char ** data = new unsigned char * [GetHeight()];
1990     data[0] = GetData();
1991     for (i = 1; i < GetHeight(); i++)
1992         data[i] = data[i - 1] + (3 * GetWidth());
1993
1994     // Same for alpha channel
1995     unsigned char ** alpha = NULL;
1996     if (has_alpha)
1997     {
1998         alpha = new unsigned char * [GetHeight()];
1999         alpha[0] = GetAlpha();
2000         for (i = 1; i < GetHeight(); i++)
2001             alpha[i] = alpha[i - 1] + GetWidth();
2002     }
2003
2004     // precompute coefficients for rotation formula
2005     // (sine and cosine of the angle)
2006     const double cos_angle = cos(angle);
2007     const double sin_angle = sin(angle);
2008
2009     // Create new Image to store the result
2010     // First, find rectangle that covers the rotated image;  to do that,
2011     // rotate the four corners
2012
2013     const wxRealPoint p0(centre_of_rotation.x, centre_of_rotation.y);
2014
2015     wxRealPoint p1 = rotated_point (0, 0, cos_angle, sin_angle, p0);
2016     wxRealPoint p2 = rotated_point (0, GetHeight(), cos_angle, sin_angle, p0);
2017     wxRealPoint p3 = rotated_point (GetWidth(), 0, cos_angle, sin_angle, p0);
2018     wxRealPoint p4 = rotated_point (GetWidth(), GetHeight(), cos_angle, sin_angle, p0);
2019
2020     int x1 = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x)));
2021     int y1 = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y)));
2022     int x2 = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x)));
2023     int y2 = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y)));
2024
2025     // Create rotated image
2026     wxImage rotated (x2 - x1 + 1, y2 - y1 + 1, false);
2027     // With alpha channel
2028     if (has_alpha)
2029         rotated.SetAlpha();
2030
2031     if (offset_after_rotation != NULL)
2032     {
2033         *offset_after_rotation = wxPoint (x1, y1);
2034     }
2035
2036     // GRG: The rotated (destination) image is always accessed
2037     //      sequentially, so there is no need for a pointer-based
2038     //      array here (and in fact it would be slower).
2039     //
2040     unsigned char * dst = rotated.GetData();
2041
2042     unsigned char * alpha_dst = NULL;
2043     if (has_alpha)
2044         alpha_dst = rotated.GetAlpha();
2045
2046     // GRG: if the original image has a mask, use its RGB values
2047     //      as the blank pixel, else, fall back to default (black).
2048     //
2049     unsigned char blank_r = 0;
2050     unsigned char blank_g = 0;
2051     unsigned char blank_b = 0;
2052
2053     if (HasMask())
2054     {
2055         blank_r = GetMaskRed();
2056         blank_g = GetMaskGreen();
2057         blank_b = GetMaskBlue();
2058         rotated.SetMaskColour( blank_r, blank_g, blank_b );
2059     }
2060
2061     // Now, for each point of the rotated image, find where it came from, by
2062     // performing an inverse rotation (a rotation of -angle) and getting the
2063     // pixel at those coordinates
2064
2065     // GRG: I've taken the (interpolating) test out of the loops, so that
2066     //      it is done only once, instead of repeating it for each pixel.
2067
2068     int x;
2069     if (interpolating)
2070     {
2071         for (int y = 0; y < rotated.GetHeight(); y++)
2072         {
2073             for (x = 0; x < rotated.GetWidth(); x++)
2074             {
2075                 wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
2076
2077                 if (-0.25 < src.x && src.x < GetWidth() - 0.75 &&
2078                     -0.25 < src.y && src.y < GetHeight() - 0.75)
2079                 {
2080                     // interpolate using the 4 enclosing grid-points.  Those
2081                     // points can be obtained using floor and ceiling of the
2082                     // exact coordinates of the point
2083                         // C.M. 2000-02-17:  when the point is near the border, special care is required.
2084
2085                     int x1, y1, x2, y2;
2086
2087                     if (0 < src.x && src.x < GetWidth() - 1)
2088                     {
2089                         x1 = wxCint(floor(src.x));
2090                         x2 = wxCint(ceil(src.x));
2091                     }
2092                     else    // else means that x is near one of the borders (0 or width-1)
2093                     {
2094                         x1 = x2 = wxCint (src.x);
2095                     }
2096
2097                     if (0 < src.y && src.y < GetHeight() - 1)
2098                     {
2099                         y1 = wxCint(floor(src.y));
2100                         y2 = wxCint(ceil(src.y));
2101                     }
2102                     else
2103                     {
2104                         y1 = y2 = wxCint (src.y);
2105                     }
2106
2107                     // get four points and the distances (square of the distance,
2108                     // for efficiency reasons) for the interpolation formula
2109
2110                     // GRG: Do not calculate the points until they are
2111                     //      really needed -- this way we can calculate
2112                     //      just one, instead of four, if d1, d2, d3
2113                     //      or d4 are < gs_Epsilon
2114
2115                     const double d1 = (src.x - x1) * (src.x - x1) + (src.y - y1) * (src.y - y1);
2116                     const double d2 = (src.x - x2) * (src.x - x2) + (src.y - y1) * (src.y - y1);
2117                     const double d3 = (src.x - x2) * (src.x - x2) + (src.y - y2) * (src.y - y2);
2118                     const double d4 = (src.x - x1) * (src.x - x1) + (src.y - y2) * (src.y - y2);
2119
2120                     // Now interpolate as a weighted average of the four surrounding
2121                     // points, where the weights are the distances to each of those points
2122
2123                     // If the point is exactly at one point of the grid of the source
2124                     // image, then don't interpolate -- just assign the pixel
2125
2126                     if (d1 < gs_Epsilon)        // d1,d2,d3,d4 are positive -- no need for abs()
2127                     {
2128                         unsigned char *p = data[y1] + (3 * x1);
2129                         *(dst++) = *(p++);
2130                         *(dst++) = *(p++);
2131                         *(dst++) = *p;
2132
2133                         if (has_alpha)
2134                         {
2135                             unsigned char *p = alpha[y1] + x1;
2136                             *(alpha_dst++) = *p;
2137                         }
2138                     }
2139                     else if (d2 < gs_Epsilon)
2140                     {
2141                         unsigned char *p = data[y1] + (3 * x2);
2142                         *(dst++) = *(p++);
2143                         *(dst++) = *(p++);
2144                         *(dst++) = *p;
2145
2146                         if (has_alpha)
2147                         {
2148                             unsigned char *p = alpha[y1] + x2;
2149                             *(alpha_dst++) = *p;
2150                         }
2151                     }
2152                     else if (d3 < gs_Epsilon)
2153                     {
2154                         unsigned char *p = data[y2] + (3 * x2);
2155                         *(dst++) = *(p++);
2156                         *(dst++) = *(p++);
2157                         *(dst++) = *p;
2158
2159                         if (has_alpha)
2160                         {
2161                             unsigned char *p = alpha[y2] + x2;
2162                             *(alpha_dst++) = *p;
2163                         }
2164                     }
2165                     else if (d4 < gs_Epsilon)
2166                     {
2167                         unsigned char *p = data[y2] + (3 * x1);
2168                         *(dst++) = *(p++);
2169                         *(dst++) = *(p++);
2170                         *(dst++) = *p;
2171
2172                         if (has_alpha)
2173                         {
2174                             unsigned char *p = alpha[y2] + x1;
2175                             *(alpha_dst++) = *p;
2176                         }
2177                     }
2178                     else
2179                     {
2180                         // weights for the weighted average are proportional to the inverse of the distance
2181                         unsigned char *v1 = data[y1] + (3 * x1);
2182                         unsigned char *v2 = data[y1] + (3 * x2);
2183                         unsigned char *v3 = data[y2] + (3 * x2);
2184                         unsigned char *v4 = data[y2] + (3 * x1);
2185
2186                         const double w1 = 1/d1, w2 = 1/d2, w3 = 1/d3, w4 = 1/d4;
2187
2188                         // GRG: Unrolled.
2189
2190                         *(dst++) = (unsigned char)
2191                             ( (w1 * *(v1++) + w2 * *(v2++) +
2192                                w3 * *(v3++) + w4 * *(v4++)) /
2193                               (w1 + w2 + w3 + w4) );
2194                         *(dst++) = (unsigned char)
2195                             ( (w1 * *(v1++) + w2 * *(v2++) +
2196                                w3 * *(v3++) + w4 * *(v4++)) /
2197                               (w1 + w2 + w3 + w4) );
2198                         *(dst++) = (unsigned char)
2199                             ( (w1 * *v1 + w2 * *v2 +
2200                                w3 * *v3 + w4 * *v4) /
2201                               (w1 + w2 + w3 + w4) );
2202
2203                         if (has_alpha)
2204                         {
2205                             unsigned char *v1 = alpha[y1] + (x1);
2206                             unsigned char *v2 = alpha[y1] + (x2);
2207                             unsigned char *v3 = alpha[y2] + (x2);
2208                             unsigned char *v4 = alpha[y2] + (x1);
2209
2210                             *(alpha_dst++) = (unsigned char)
2211                                 ( (w1 * *v1 + w2 * *v2 +
2212                                    w3 * *v3 + w4 * *v4) /
2213                                   (w1 + w2 + w3 + w4) );
2214                         }
2215                     }
2216                 }
2217                 else
2218                 {
2219                     *(dst++) = blank_r;
2220                     *(dst++) = blank_g;
2221                     *(dst++) = blank_b;
2222
2223                     if (has_alpha)
2224                         *(alpha_dst++) = 0;
2225                 }
2226             }
2227         }
2228     }
2229     else    // not interpolating
2230     {
2231         for (int y = 0; y < rotated.GetHeight(); y++)
2232         {
2233             for (x = 0; x < rotated.GetWidth(); x++)
2234             {
2235                 wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
2236
2237                 const int xs = wxCint (src.x);      // wxCint rounds to the
2238                 const int ys = wxCint (src.y);      // closest integer
2239
2240                 if (0 <= xs && xs < GetWidth() &&
2241                     0 <= ys && ys < GetHeight())
2242                 {
2243                     unsigned char *p = data[ys] + (3 * xs);
2244                     *(dst++) = *(p++);
2245                     *(dst++) = *(p++);
2246                     *(dst++) = *p;
2247
2248                     if (has_alpha)
2249                     {
2250                         unsigned char *p = alpha[ys] + (xs);
2251                         *(alpha_dst++) = *p;
2252                     }
2253                 }
2254                 else
2255                 {
2256                     *(dst++) = blank_r;
2257                     *(dst++) = blank_g;
2258                     *(dst++) = blank_b;
2259
2260                     if (has_alpha)
2261                         *(alpha_dst++) = 255;
2262                 }
2263             }
2264         }
2265     }
2266
2267     delete [] data;
2268
2269     if (has_alpha)
2270         delete [] alpha;
2271
2272     return rotated;
2273 }
2274
2275
2276
2277
2278
2279 // A module to allow wxImage initialization/cleanup
2280 // without calling these functions from app.cpp or from
2281 // the user's application.
2282
2283 class wxImageModule: public wxModule
2284 {
2285 DECLARE_DYNAMIC_CLASS(wxImageModule)
2286 public:
2287     wxImageModule() {}
2288     bool OnInit() { wxImage::InitStandardHandlers(); return true; };
2289     void OnExit() { wxImage::CleanUpHandlers(); };
2290 };
2291
2292 IMPLEMENT_DYNAMIC_CLASS(wxImageModule, wxModule)
2293
2294
2295 #endif // wxUSE_IMAGE