src/common/image.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/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 // For compilers that support precompilation, includes "wx.h".
  11 #include "wx/wxprec.h"
  12
  13 #ifdef __BORLANDC__
  14     #pragma hdrstop
  15 #endif
  16
  17 #if wxUSE_IMAGE
  18
  19 #ifndef WX_PRECOMP
  20     #include "wx/log.h"
  21     #include "wx/app.h"
  22     #include "wx/hash.h"
  23 #endif
  24
  25 #include "wx/image.h"
  26 #include "wx/bitmap.h"
  27 #include "wx/debug.h"
  28 #include "wx/filefn.h"
  29 #include "wx/wfstream.h"
  30 #include "wx/intl.h"
  31 #include "wx/module.h"
  32 #include "wx/utils.h"
  33 #include "wx/math.h"
  34
  35 #if wxUSE_XPM
  36     #include "wx/xpmdecod.h"
  37 #endif
  38
  39 // For memcpy
  40 #include <string.h>
  41
  42 //-----------------------------------------------------------------------------
  43 // wxImage
  44 //-----------------------------------------------------------------------------
  45
  46 class wxImageRefData: public wxObjectRefData
  47 {
  48 public:
  49     wxImageRefData();
  50     virtual ~wxImageRefData();
  51
  52     int             m_width;
  53     int             m_height;
  54     unsigned char  *m_data;
  55
  56     bool            m_hasMask;
  57     unsigned char   m_maskRed,m_maskGreen,m_maskBlue;
  58
  59     // alpha channel data, may be NULL for the formats without alpha support
  60     unsigned char  *m_alpha;
  61
  62     bool            m_ok;
  63
  64     // if true, m_data is pointer to static data and shouldn't be freed
  65     bool            m_static;
  66
  67     // same as m_static but for m_alpha
  68     bool            m_staticAlpha;
  69
  70 #if wxUSE_PALETTE
  71     wxPalette       m_palette;
  72 #endif // wxUSE_PALETTE
  73
  74     wxArrayString   m_optionNames;
  75     wxArrayString   m_optionValues;
  76
  77     DECLARE_NO_COPY_CLASS(wxImageRefData)
  78 };
  79
  80 wxImageRefData::wxImageRefData()
  81 {
  82     m_width = 0;
  83     m_height = 0;
  84     m_data =
  85     m_alpha = (unsigned char *) NULL;
  86
  87     m_maskRed = 0;
  88     m_maskGreen = 0;
  89     m_maskBlue = 0;
  90     m_hasMask = false;
  91
  92     m_ok = false;
  93     m_static =
  94     m_staticAlpha = false;
  95 }
  96
  97 wxImageRefData::~wxImageRefData()
  98 {
  99     if ( !m_static )
 100         free( m_data );
 101     if ( !m_staticAlpha )
 102         free( m_alpha );
 103 }
 104
 105 wxList wxImage::sm_handlers;
 106
 107 wxImage wxNullImage;
 108
 109 //-----------------------------------------------------------------------------
 110
 111 #define M_IMGDATA ((wxImageRefData *)m_refData)
 112
 113 IMPLEMENT_DYNAMIC_CLASS(wxImage, wxObject)
 114
 115 wxImage::wxImage( int width, int height, bool clear )
 116 {
 117     Create( width, height, clear );
 118 }
 119
 120 wxImage::wxImage( int width, int height, unsigned char* data, bool static_data )
 121 {
 122     Create( width, height, data, static_data );
 123 }
 124
 125 wxImage::wxImage( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data )
 126 {
 127     Create( width, height, data, alpha, static_data );
 128 }
 129
 130 wxImage::wxImage( const wxString& name, long type, int index )
 131 {
 132     LoadFile( name, type, index );
 133 }
 134
 135 wxImage::wxImage( const wxString& name, const wxString& mimetype, int index )
 136 {
 137     LoadFile( name, mimetype, index );
 138 }
 139
 140 #if wxUSE_STREAMS
 141 wxImage::wxImage( wxInputStream& stream, long type, int index )
 142 {
 143     LoadFile( stream, type, index );
 144 }
 145
 146 wxImage::wxImage( wxInputStream& stream, const wxString& mimetype, int index )
 147 {
 148     LoadFile( stream, mimetype, index );
 149 }
 150 #endif // wxUSE_STREAMS
 151
 152 wxImage::wxImage( const char** xpmData )
 153 {
 154     Create(xpmData);
 155 }
 156
 157 wxImage::wxImage( char** xpmData )
 158 {
 159     Create((const char**) xpmData);
 160 }
 161
 162 bool wxImage::Create( const char** xpmData )
 163 {
 164 #if wxUSE_XPM
 165     UnRef();
 166
 167     wxXPMDecoder decoder;
 168     (*this) = decoder.ReadData(xpmData);
 169     return Ok();
 170 #else
 171     return false;
 172 #endif
 173 }
 174
 175 bool wxImage::Create( int width, int height, bool clear )
 176 {
 177     UnRef();
 178
 179     m_refData = new wxImageRefData();
 180
 181     M_IMGDATA->m_data = (unsigned char *) malloc( width*height*3 );
 182     if (!M_IMGDATA->m_data)
 183     {
 184         UnRef();
 185         return false;
 186     }
 187
 188     if (clear)
 189         memset(M_IMGDATA->m_data, 0, width*height*3);
 190
 191     M_IMGDATA->m_width = width;
 192     M_IMGDATA->m_height = height;
 193     M_IMGDATA->m_ok = true;
 194
 195     return true;
 196 }
 197
 198 bool wxImage::Create( int width, int height, unsigned char* data, bool static_data )
 199 {
 200     UnRef();
 201
 202     wxCHECK_MSG( data, false, _T("NULL data in wxImage::Create") );
 203
 204     m_refData = new wxImageRefData();
 205
 206     M_IMGDATA->m_data = data;
 207     M_IMGDATA->m_width = width;
 208     M_IMGDATA->m_height = height;
 209     M_IMGDATA->m_ok = true;
 210     M_IMGDATA->m_static = static_data;
 211
 212     return true;
 213 }
 214
 215 bool wxImage::Create( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data )
 216 {
 217     UnRef();
 218
 219     wxCHECK_MSG( data, false, _T("NULL data in wxImage::Create") );
 220
 221     m_refData = new wxImageRefData();
 222
 223     M_IMGDATA->m_data = data;
 224     M_IMGDATA->m_alpha = alpha;
 225     M_IMGDATA->m_width = width;
 226     M_IMGDATA->m_height = height;
 227     M_IMGDATA->m_ok = true;
 228     M_IMGDATA->m_static = static_data;
 229
 230     return true;
 231 }
 232
 233 void wxImage::Destroy()
 234 {
 235     UnRef();
 236 }
 237
 238 wxImage wxImage::Copy() const
 239 {
 240     wxImage image;
 241
 242     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 243
 244     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 245
 246     unsigned char *data = image.GetData();
 247
 248     wxCHECK_MSG( data, image, wxT("unable to create image") );
 249
 250     image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 251     image.SetMask( M_IMGDATA->m_hasMask );
 252
 253     memcpy( data, GetData(), M_IMGDATA->m_width*M_IMGDATA->m_height*3 );
 254
 255     wxImageRefData *imgData = (wxImageRefData *)image.m_refData;
 256
 257     // also copy the alpha channel
 258     if (HasAlpha())
 259     {
 260         image.SetAlpha();
 261         unsigned char* alpha = image.GetAlpha();
 262         memcpy( alpha, GetAlpha(), M_IMGDATA->m_width*M_IMGDATA->m_height );
 263     }
 264
 265     // also copy the image options
 266     imgData->m_optionNames = M_IMGDATA->m_optionNames;
 267     imgData->m_optionValues = M_IMGDATA->m_optionValues;
 268
 269     return image;
 270 }
 271
 272 wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const
 273 {
 274     if( xFactor == 1 && yFactor == 1 )
 275         return Copy() ;
 276
 277     wxImage image;
 278
 279     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 280
 281     // can't scale to/from 0 size
 282     wxCHECK_MSG( (xFactor > 0) && (yFactor > 0), image,
 283                  wxT("invalid new image size") );
 284
 285     long old_height = M_IMGDATA->m_height,
 286          old_width  = M_IMGDATA->m_width;
 287
 288     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 289                  wxT("invalid old image size") );
 290
 291     long width = old_width / xFactor ;
 292     long height = old_height / yFactor ;
 293
 294     image.Create( width, height, false );
 295
 296     char unsigned *data = image.GetData();
 297
 298     wxCHECK_MSG( data, image, wxT("unable to create image") );
 299
 300     bool hasMask = false ;
 301     unsigned char maskRed = 0;
 302     unsigned char maskGreen = 0;
 303     unsigned char maskBlue =0 ;
 304
 305     unsigned char *source_data = M_IMGDATA->m_data;
 306     unsigned char *target_data = data;
 307     unsigned char *source_alpha = 0 ;
 308     unsigned char *target_alpha = 0 ;
 309     if (M_IMGDATA->m_hasMask)
 310     {
 311         hasMask = true ;
 312         maskRed = M_IMGDATA->m_maskRed;
 313         maskGreen = M_IMGDATA->m_maskGreen;
 314         maskBlue =M_IMGDATA->m_maskBlue ;
 315
 316         image.SetMaskColour( M_IMGDATA->m_maskRed,
 317                              M_IMGDATA->m_maskGreen,
 318                              M_IMGDATA->m_maskBlue );
 319     }
 320     else
 321     {
 322         source_alpha = M_IMGDATA->m_alpha ;
 323         if ( source_alpha )
 324         {
 325             image.SetAlpha() ;
 326             target_alpha = image.GetAlpha() ;
 327         }
 328     }
 329
 330     for (long y = 0; y < height; y++)
 331     {
 332         for (long x = 0; x < width; x++)
 333         {
 334             unsigned long avgRed = 0 ;
 335             unsigned long avgGreen = 0;
 336             unsigned long avgBlue = 0;
 337             unsigned long avgAlpha = 0 ;
 338             unsigned long counter = 0 ;
 339             // determine average
 340             for ( int y1 = 0 ; y1 < yFactor ; ++y1 )
 341             {
 342                 long y_offset = (y * yFactor + y1) * old_width;
 343                 for ( int x1 = 0 ; x1 < xFactor ; ++x1 )
 344                 {
 345                     unsigned char *pixel = source_data + 3 * ( y_offset + x * xFactor + x1 ) ;
 346                     unsigned char red = pixel[0] ;
 347                     unsigned char green = pixel[1] ;
 348                     unsigned char blue = pixel[2] ;
 349                     unsigned char alpha = 255  ;
 350                     if ( source_alpha )
 351                         alpha = *(source_alpha + y_offset + x * xFactor + x1) ;
 352                     if ( !hasMask || red != maskRed || green != maskGreen || blue != maskBlue )
 353                     {
 354                         if ( alpha > 0 )
 355                         {
 356                             avgRed += red ;
 357                             avgGreen += green ;
 358                             avgBlue += blue ;
 359                         }
 360                         avgAlpha += alpha ;
 361                         counter++ ;
 362                     }
 363                 }
 364             }
 365             if ( counter == 0 )
 366             {
 367                 *(target_data++) = M_IMGDATA->m_maskRed ;
 368                 *(target_data++) = M_IMGDATA->m_maskGreen ;
 369                 *(target_data++) = M_IMGDATA->m_maskBlue ;
 370             }
 371             else
 372             {
 373                 if ( source_alpha )
 374                     *(target_alpha++) = (unsigned char)(avgAlpha / counter ) ;
 375                 *(target_data++) = (unsigned char)(avgRed / counter);
 376                 *(target_data++) = (unsigned char)(avgGreen / counter);
 377                 *(target_data++) = (unsigned char)(avgBlue / counter);
 378             }
 379         }
 380     }
 381
 382     // In case this is a cursor, make sure the hotspot is scaled accordingly:
 383     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
 384         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
 385                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X))/xFactor);
 386     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
 387         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
 388                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y))/yFactor);
 389
 390     return image;
 391 }
 392
 393 wxImage wxImage::Scale( int width, int height ) const
 394 {
 395     wxImage image;
 396
 397     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 398
 399     // can't scale to/from 0 size
 400     wxCHECK_MSG( (width > 0) && (height > 0), image,
 401                  wxT("invalid new image size") );
 402
 403     long old_height = M_IMGDATA->m_height,
 404          old_width  = M_IMGDATA->m_width;
 405     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 406                  wxT("invalid old image size") );
 407
 408     if ( old_width % width == 0 && old_width >= width &&
 409         old_height % height == 0 && old_height >= height )
 410     {
 411         return ShrinkBy( old_width / width , old_height / height ) ;
 412     }
 413     image.Create( width, height, false );
 414
 415     unsigned char *data = image.GetData();
 416
 417     wxCHECK_MSG( data, image, wxT("unable to create image") );
 418
 419     unsigned char *source_data = M_IMGDATA->m_data;
 420     unsigned char *target_data = data;
 421     unsigned char *source_alpha = 0 ;
 422     unsigned char *target_alpha = 0 ;
 423
 424     if (M_IMGDATA->m_hasMask)
 425     {
 426         image.SetMaskColour( M_IMGDATA->m_maskRed,
 427                              M_IMGDATA->m_maskGreen,
 428                              M_IMGDATA->m_maskBlue );
 429     }
 430     else
 431     {
 432         source_alpha = M_IMGDATA->m_alpha ;
 433         if ( source_alpha )
 434         {
 435             image.SetAlpha() ;
 436             target_alpha = image.GetAlpha() ;
 437         }
 438     }
 439
 440     long x_delta = (old_width<<16) / width;
 441     long y_delta = (old_height<<16) / height;
 442
 443     unsigned char* dest_pixel = target_data;
 444
 445     long y = 0;
 446     for ( long j = 0; j < height; j++ )
 447         {
 448         unsigned char* src_line = &source_data[(y>>16)*old_width*3];
 449         unsigned char* src_alpha_line = source_alpha ? &source_alpha[(y>>16)*old_width] : 0 ;
 450
 451         long x = 0;
 452         for ( long i = 0; i < width; i++ )
 453         {
 454              unsigned char* src_pixel = &src_line[(x>>16)*3];
 455              unsigned char* src_alpha_pixel = source_alpha ? &src_alpha_line[(x>>16)] : 0 ;
 456              dest_pixel[0] = src_pixel[0];
 457              dest_pixel[1] = src_pixel[1];
 458              dest_pixel[2] = src_pixel[2];
 459              dest_pixel += 3;
 460              if ( source_alpha )
 461                 *(target_alpha++) = *src_alpha_pixel ;
 462              x += x_delta;
 463         }
 464
 465         y += y_delta;
 466     }
 467
 468     // In case this is a cursor, make sure the hotspot is scaled accordingly:
 469     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
 470         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
 471                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X)*width)/old_width);
 472     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
 473         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
 474                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y)*height)/old_height);
 475
 476     return image;
 477 }
 478
 479 wxImage wxImage::Rotate90( bool clockwise ) const
 480 {
 481     wxImage image;
 482
 483     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 484
 485     image.Create( M_IMGDATA->m_height, M_IMGDATA->m_width, false );
 486
 487     unsigned char *data = image.GetData();
 488
 489     wxCHECK_MSG( data, image, wxT("unable to create image") );
 490
 491     unsigned char *source_data = M_IMGDATA->m_data;
 492     unsigned char *target_data;
 493     unsigned char *alpha_data = 0 ;
 494     unsigned char *source_alpha = 0 ;
 495     unsigned char *target_alpha = 0 ;
 496
 497     if (M_IMGDATA->m_hasMask)
 498     {
 499         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 500     }
 501     else
 502     {
 503         source_alpha = M_IMGDATA->m_alpha ;
 504         if ( source_alpha )
 505         {
 506             image.SetAlpha() ;
 507             alpha_data = image.GetAlpha() ;
 508         }
 509     }
 510
 511     long height = M_IMGDATA->m_height;
 512     long width  = M_IMGDATA->m_width;
 513
 514     for (long j = 0; j < height; j++)
 515     {
 516         for (long i = 0; i < width; i++)
 517         {
 518             if (clockwise)
 519             {
 520                 target_data = data + (((i+1)*height) - j - 1)*3;
 521                 if(source_alpha)
 522                     target_alpha = alpha_data + (((i+1)*height) - j - 1);
 523             }
 524             else
 525             {
 526                 target_data = data + ((height*(width-1)) + j - (i*height))*3;
 527                 if(source_alpha)
 528                     target_alpha = alpha_data + ((height*(width-1)) + j - (i*height));
 529             }
 530             memcpy( target_data, source_data, 3 );
 531             source_data += 3;
 532
 533             if(source_alpha)
 534             {
 535                 memcpy( target_alpha, source_alpha, 1 );
 536                 source_alpha += 1;
 537             }
 538         }
 539     }
 540
 541     return image;
 542 }
 543
 544 wxImage wxImage::Mirror( bool horizontally ) const
 545 {
 546     wxImage image;
 547
 548     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 549
 550     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 551
 552     unsigned char *data = image.GetData();
 553     unsigned char *alpha = NULL;
 554
 555     wxCHECK_MSG( data, image, wxT("unable to create image") );
 556
 557     if (M_IMGDATA->m_alpha != NULL) {
 558         image.SetAlpha();
 559         alpha = image.GetAlpha();
 560         wxCHECK_MSG( alpha, image, wxT("unable to create alpha channel") );
 561     }
 562
 563     if (M_IMGDATA->m_hasMask)
 564         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 565
 566     long height = M_IMGDATA->m_height;
 567     long width  = M_IMGDATA->m_width;
 568
 569     unsigned char *source_data = M_IMGDATA->m_data;
 570     unsigned char *target_data;
 571
 572     if (horizontally)
 573     {
 574         for (long j = 0; j < height; j++)
 575         {
 576             data += width*3;
 577             target_data = data-3;
 578             for (long i = 0; i < width; i++)
 579             {
 580                 memcpy( target_data, source_data, 3 );
 581                 source_data += 3;
 582                 target_data -= 3;
 583             }
 584         }
 585
 586         if (alpha != NULL)
 587         {
 588             // src_alpha starts at the first pixel and increases by 1 after each step
 589             // (a step here is the copy of the alpha value of one pixel)
 590             const unsigned char *src_alpha = M_IMGDATA->m_alpha;
 591             // dest_alpha starts just beyond the first line, decreases before each step,
 592             // and after each line is finished, increases by 2 widths (skipping the line
 593             // just copied and the line that will be copied next)
 594             unsigned char *dest_alpha = alpha + width;
 595
 596             for (long jj = 0; jj < height; ++jj)
 597             {
 598                 for (long i = 0; i < width; ++i) {
 599                     *(--dest_alpha) = *(src_alpha++); // copy one pixel
 600                 }
 601                 dest_alpha += 2 * width; // advance beyond the end of the next line
 602             }
 603         }
 604     }
 605     else
 606     {
 607         for (long i = 0; i < height; i++)
 608         {
 609             target_data = data + 3*width*(height-1-i);
 610             memcpy( target_data, source_data, (size_t)3*width );
 611             source_data += 3*width;
 612         }
 613
 614         if (alpha != NULL)
 615         {
 616             // src_alpha starts at the first pixel and increases by 1 width after each step
 617             // (a step here is the copy of the alpha channel of an entire line)
 618             const unsigned char *src_alpha = M_IMGDATA->m_alpha;
 619             // dest_alpha starts just beyond the last line (beyond the whole image)
 620             // and decreases by 1 width before each step
 621             unsigned char *dest_alpha = alpha + width * height;
 622
 623             for (long jj = 0; jj < height; ++jj)
 624             {
 625                 dest_alpha -= width;
 626                 memcpy( dest_alpha, src_alpha, (size_t)width );
 627                 src_alpha += width;
 628             }
 629         }
 630     }
 631
 632     return image;
 633 }
 634
 635 wxImage wxImage::GetSubImage( const wxRect &rect ) const
 636 {
 637     wxImage image;
 638
 639     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 640
 641     wxCHECK_MSG( (rect.GetLeft()>=0) && (rect.GetTop()>=0) &&
 642                  (rect.GetRight()<=GetWidth()) && (rect.GetBottom()<=GetHeight()),
 643                  image, wxT("invalid subimage size") );
 644
 645     const int subwidth = rect.GetWidth();
 646     const int subheight = rect.GetHeight();
 647
 648     image.Create( subwidth, subheight, false );
 649
 650     const unsigned char *src_data = GetData();
 651     const unsigned char *src_alpha = M_IMGDATA->m_alpha;
 652     unsigned char *subdata = image.GetData();
 653     unsigned char *subalpha = NULL;
 654
 655     wxCHECK_MSG( subdata, image, wxT("unable to create image") );
 656
 657     if (src_alpha != NULL) {
 658         image.SetAlpha();
 659         subalpha = image.GetAlpha();
 660         wxCHECK_MSG( subalpha, image, wxT("unable to create alpha channel"));
 661     }
 662
 663     if (M_IMGDATA->m_hasMask)
 664         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 665
 666     const int width = GetWidth();
 667     const int pixsoff = rect.GetLeft() + width * rect.GetTop();
 668
 669     src_data += 3 * pixsoff;
 670     src_alpha += pixsoff; // won't be used if was NULL, so this is ok
 671
 672     for (long j = 0; j < subheight; ++j)
 673     {
 674         memcpy( subdata, src_data, 3 * subwidth );
 675         subdata += 3 * subwidth;
 676         src_data += 3 * width;
 677         if (subalpha != NULL) {
 678             memcpy( subalpha, src_alpha, subwidth );
 679             subalpha += subwidth;
 680             src_alpha += width;
 681         }
 682     }
 683
 684     return image;
 685 }
 686
 687 wxImage wxImage::Size( const wxSize& size, const wxPoint& pos,
 688                        int r_, int g_, int b_ ) const
 689 {
 690     wxImage image;
 691
 692     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 693     wxCHECK_MSG( (size.GetWidth() > 0) && (size.GetHeight() > 0), image, wxT("invalid size") );
 694
 695     int width = GetWidth(), height = GetHeight();
 696     image.Create(size.GetWidth(), size.GetHeight(), false);
 697
 698     unsigned char r = (unsigned char)r_;
 699     unsigned char g = (unsigned char)g_;
 700     unsigned char b = (unsigned char)b_;
 701     if ((r_ == -1) && (g_ == -1) && (b_ == -1))
 702     {
 703         GetOrFindMaskColour( &r, &g, &b );
 704         image.SetMaskColour(r, g, b);
 705     }
 706
 707     image.SetRGB(wxRect(), r, g, b);
 708
 709     wxRect subRect(pos.x, pos.y, width, height);
 710     wxRect finalRect(0, 0, size.GetWidth(), size.GetHeight());
 711     if (pos.x < 0)
 712         finalRect.width -= pos.x;
 713     if (pos.y < 0)
 714         finalRect.height -= pos.y;
 715
 716     subRect.Intersect(finalRect);
 717
 718     if (!subRect.IsEmpty())
 719     {
 720         if ((subRect.GetWidth() == width) && (subRect.GetHeight() == height))
 721             image.Paste(*this, pos.x, pos.y);
 722         else
 723             image.Paste(GetSubImage(subRect), pos.x, pos.y);
 724     }
 725
 726     return image;
 727 }
 728
 729 void wxImage::Paste( const wxImage &image, int x, int y )
 730 {
 731     wxCHECK_RET( Ok(), wxT("invalid image") );
 732     wxCHECK_RET( image.Ok(), wxT("invalid image") );
 733
 734     int xx = 0;
 735     int yy = 0;
 736     int width = image.GetWidth();
 737     int height = image.GetHeight();
 738
 739     if (x < 0)
 740     {
 741         xx = -x;
 742         width += x;
 743     }
 744     if (y < 0)
 745     {
 746         yy = -y;
 747         height += y;
 748     }
 749
 750     if ((x+xx)+width > M_IMGDATA->m_width)
 751         width = M_IMGDATA->m_width - (x+xx);
 752     if ((y+yy)+height > M_IMGDATA->m_height)
 753         height = M_IMGDATA->m_height - (y+yy);
 754
 755     if (width < 1) return;
 756     if (height < 1) return;
 757
 758     if ((!HasMask() && !image.HasMask()) ||
 759         (HasMask() && !image.HasMask()) ||
 760        ((HasMask() && image.HasMask() &&
 761          (GetMaskRed()==image.GetMaskRed()) &&
 762          (GetMaskGreen()==image.GetMaskGreen()) &&
 763          (GetMaskBlue()==image.GetMaskBlue()))))
 764     {
 765         width *= 3;
 766         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 767         int source_step = image.GetWidth()*3;
 768
 769         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 770         int target_step = M_IMGDATA->m_width*3;
 771         for (int j = 0; j < height; j++)
 772         {
 773             memcpy( target_data, source_data, width );
 774             source_data += source_step;
 775             target_data += target_step;
 776         }
 777         return;
 778     }
 779
 780     if (!HasMask() && image.HasMask())
 781     {
 782         unsigned char r = image.GetMaskRed();
 783         unsigned char g = image.GetMaskGreen();
 784         unsigned char b = image.GetMaskBlue();
 785
 786         width *= 3;
 787         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 788         int source_step = image.GetWidth()*3;
 789
 790         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 791         int target_step = M_IMGDATA->m_width*3;
 792
 793         for (int j = 0; j < height; j++)
 794         {
 795             for (int i = 0; i < width; i+=3)
 796             {
 797                 if ((source_data[i]   != r) &&
 798                     (source_data[i+1] != g) &&
 799                     (source_data[i+2] != b))
 800                 {
 801                     memcpy( target_data+i, source_data+i, 3 );
 802                 }
 803             }
 804             source_data += source_step;
 805             target_data += target_step;
 806         }
 807     }
 808 }
 809
 810 void wxImage::Replace( unsigned char r1, unsigned char g1, unsigned char b1,
 811                        unsigned char r2, unsigned char g2, unsigned char b2 )
 812 {
 813     wxCHECK_RET( Ok(), wxT("invalid image") );
 814
 815     unsigned char *data = GetData();
 816
 817     const int w = GetWidth();
 818     const int h = GetHeight();
 819
 820     for (int j = 0; j < h; j++)
 821         for (int i = 0; i < w; i++)
 822         {
 823             if ((data[0] == r1) && (data[1] == g1) && (data[2] == b1))
 824             {
 825                 data[0] = r2;
 826                 data[1] = g2;
 827                 data[2] = b2;
 828             }
 829             data += 3;
 830         }
 831 }
 832
 833 wxImage wxImage::ConvertToGreyscale( double lr, double lg, double lb ) const
 834 {
 835     wxImage image;
 836
 837     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 838
 839     image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false);
 840
 841     unsigned char *dest = image.GetData();
 842
 843     wxCHECK_MSG( dest, image, wxT("unable to create image") );
 844
 845     unsigned char *src = M_IMGDATA->m_data;
 846     bool hasMask = M_IMGDATA->m_hasMask;
 847     unsigned char maskRed = M_IMGDATA->m_maskRed;
 848     unsigned char maskGreen = M_IMGDATA->m_maskGreen;
 849     unsigned char maskBlue = M_IMGDATA->m_maskBlue;
 850
 851     if ( hasMask )
 852         image.SetMaskColour(maskRed, maskGreen, maskBlue);
 853
 854     const long size = M_IMGDATA->m_width * M_IMGDATA->m_height;
 855     for ( long i = 0; i < size; i++, src += 3, dest += 3 )
 856     {
 857         // don't modify the mask
 858         if ( hasMask && src[0] == maskRed && src[1] == maskGreen && src[2] == maskBlue )
 859         {
 860             memcpy(dest, src, 3);
 861         }
 862         else
 863         {
 864             // calculate the luma
 865             double luma = (src[0] * lr + src[1] * lg + src[2] * lb) + 0.5;
 866             dest[0] = dest[1] = dest[2] = wx_static_cast(unsigned char, luma);
 867         }
 868     }
 869
 870     return image;
 871 }
 872
 873 wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const
 874 {
 875     wxImage image;
 876
 877     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 878
 879     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 880
 881     unsigned char *data = image.GetData();
 882
 883     wxCHECK_MSG( data, image, wxT("unable to create image") );
 884
 885     if (M_IMGDATA->m_hasMask)
 886     {
 887         if (M_IMGDATA->m_maskRed == r && M_IMGDATA->m_maskGreen == g &&
 888                                          M_IMGDATA->m_maskBlue == b)
 889             image.SetMaskColour( 255, 255, 255 );
 890         else
 891             image.SetMaskColour( 0, 0, 0 );
 892     }
 893
 894     long size = M_IMGDATA->m_height * M_IMGDATA->m_width;
 895
 896     unsigned char *srcd = M_IMGDATA->m_data;
 897     unsigned char *tard = image.GetData();
 898
 899     for ( long i = 0; i < size; i++, srcd += 3, tard += 3 )
 900     {
 901         if (srcd[0] == r && srcd[1] == g && srcd[2] == b)
 902             tard[0] = tard[1] = tard[2] = 255;
 903         else
 904             tard[0] = tard[1] = tard[2] = 0;
 905     }
 906
 907     return image;
 908 }
 909
 910 int wxImage::GetWidth() const
 911 {
 912     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 913
 914     return M_IMGDATA->m_width;
 915 }
 916
 917 int wxImage::GetHeight() const
 918 {
 919     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 920
 921     return M_IMGDATA->m_height;
 922 }
 923
 924 long wxImage::XYToIndex(int x, int y) const
 925 {
 926     if ( Ok() &&
 927             x >= 0 && y >= 0 &&
 928                 x < M_IMGDATA->m_width && y < M_IMGDATA->m_height )
 929     {
 930         return y*M_IMGDATA->m_width + x;
 931     }
 932
 933     return -1;
 934 }
 935
 936 void wxImage::SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b )
 937 {
 938     long pos = XYToIndex(x, y);
 939     wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
 940
 941     pos *= 3;
 942
 943     M_IMGDATA->m_data[ pos   ] = r;
 944     M_IMGDATA->m_data[ pos+1 ] = g;
 945     M_IMGDATA->m_data[ pos+2 ] = b;
 946 }
 947
 948 void wxImage::SetRGB( const wxRect& rect_, unsigned char r, unsigned char g, unsigned char b )
 949 {
 950     wxCHECK_RET( Ok(), wxT("invalid image") );
 951
 952     wxRect rect(rect_);
 953     wxRect imageRect(0, 0, GetWidth(), GetHeight());
 954     if ( rect == wxRect() )
 955     {
 956         rect = imageRect;
 957     }
 958     else
 959     {
 960         wxCHECK_RET( imageRect.Inside(rect.GetTopLeft()) &&
 961                      imageRect.Inside(rect.GetBottomRight()),
 962                      wxT("invalid bounding rectangle") );
 963     }
 964
 965     int x1 = rect.GetLeft(),
 966         y1 = rect.GetTop(),
 967         x2 = rect.GetRight() + 1,
 968         y2 = rect.GetBottom() + 1;
 969
 970     unsigned char *data wxDUMMY_INITIALIZE(NULL);
 971     int x, y, width = GetWidth();
 972     for (y = y1; y < y2; y++)
 973     {
 974         data = M_IMGDATA->m_data + (y*width + x1)*3;
 975         for (x = x1; x < x2; x++)
 976         {
 977             *data++ = r;
 978             *data++ = g;
 979             *data++ = b;
 980         }
 981     }
 982 }
 983
 984 unsigned char wxImage::GetRed( int x, int y ) const
 985 {
 986     long pos = XYToIndex(x, y);
 987     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
 988
 989     pos *= 3;
 990
 991     return M_IMGDATA->m_data[pos];
 992 }
 993
 994 unsigned char wxImage::GetGreen( int x, int y ) const
 995 {
 996     long pos = XYToIndex(x, y);
 997     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
 998
 999     pos *= 3;
1000
1001     return M_IMGDATA->m_data[pos+1];
1002 }
1003
1004 unsigned char wxImage::GetBlue( int x, int y ) const
1005 {
1006     long pos = XYToIndex(x, y);
1007     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
1008
1009     pos *= 3;
1010
1011     return M_IMGDATA->m_data[pos+2];
1012 }
1013
1014 bool wxImage::Ok() const
1015 {
1016     // image of 0 width or height can't be considered ok - at least because it
1017     // causes crashes in ConvertToBitmap() if we don't catch it in time
1018     wxImageRefData *data = M_IMGDATA;
1019     return data && data->m_ok && data->m_width && data->m_height;
1020 }
1021
1022 unsigned char *wxImage::GetData() const
1023 {
1024     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
1025
1026     return M_IMGDATA->m_data;
1027 }
1028
1029 void wxImage::SetData( unsigned char *data, bool static_data  )
1030 {
1031     wxCHECK_RET( Ok(), wxT("invalid image") );
1032
1033     wxImageRefData *newRefData = new wxImageRefData();
1034
1035     newRefData->m_width = M_IMGDATA->m_width;
1036     newRefData->m_height = M_IMGDATA->m_height;
1037     newRefData->m_data = data;
1038     newRefData->m_ok = true;
1039     newRefData->m_maskRed = M_IMGDATA->m_maskRed;
1040     newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
1041     newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
1042     newRefData->m_hasMask = M_IMGDATA->m_hasMask;
1043     newRefData->m_static = static_data;
1044
1045     UnRef();
1046
1047     m_refData = newRefData;
1048 }
1049
1050 void wxImage::SetData( unsigned char *data, int new_width, int new_height, bool static_data )
1051 {
1052     wxImageRefData *newRefData = new wxImageRefData();
1053
1054     if (m_refData)
1055     {
1056         newRefData->m_width = new_width;
1057         newRefData->m_height = new_height;
1058         newRefData->m_data = data;
1059         newRefData->m_ok = true;
1060         newRefData->m_maskRed = M_IMGDATA->m_maskRed;
1061         newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
1062         newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
1063         newRefData->m_hasMask = M_IMGDATA->m_hasMask;
1064     }
1065     else
1066     {
1067         newRefData->m_width = new_width;
1068         newRefData->m_height = new_height;
1069         newRefData->m_data = data;
1070         newRefData->m_ok = true;
1071     }
1072     newRefData->m_static = static_data;
1073
1074     UnRef();
1075
1076     m_refData = newRefData;
1077 }
1078
1079 // ----------------------------------------------------------------------------
1080 // alpha channel support
1081 // ----------------------------------------------------------------------------
1082
1083 void wxImage::SetAlpha(int x, int y, unsigned char alpha)
1084 {
1085     wxCHECK_RET( HasAlpha(), wxT("no alpha channel") );
1086
1087     long pos = XYToIndex(x, y);
1088     wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
1089
1090     M_IMGDATA->m_alpha[pos] = alpha;
1091 }
1092
1093 unsigned char wxImage::GetAlpha(int x, int y) const
1094 {
1095     wxCHECK_MSG( HasAlpha(), 0, wxT("no alpha channel") );
1096
1097     long pos = XYToIndex(x, y);
1098     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
1099
1100     return M_IMGDATA->m_alpha[pos];
1101 }
1102
1103 bool
1104 wxImage::ConvertColourToAlpha(unsigned char r, unsigned char g, unsigned char b)
1105 {
1106     SetAlpha(NULL);
1107
1108     const int w = M_IMGDATA->m_width;
1109     const int h = M_IMGDATA->m_height;
1110
1111     unsigned char *alpha = GetAlpha();
1112     unsigned char *data = GetData();
1113
1114     for ( int y = 0; y < h; y++ )
1115     {
1116         for ( int x = 0; x < w; x++ )
1117         {
1118             *alpha++ = *data;
1119             *data++ = r;
1120             *data++ = g;
1121             *data++ = b;
1122         }
1123     }
1124
1125     return true;
1126 }
1127
1128 void wxImage::SetAlpha( unsigned char *alpha, bool static_data )
1129 {
1130     wxCHECK_RET( Ok(), wxT("invalid image") );
1131
1132     if ( !alpha )
1133     {
1134         alpha = (unsigned char *)malloc(M_IMGDATA->m_width*M_IMGDATA->m_height);
1135     }
1136
1137     free(M_IMGDATA->m_alpha);
1138     M_IMGDATA->m_alpha = alpha;
1139     M_IMGDATA->m_staticAlpha = static_data;
1140 }
1141
1142 unsigned char *wxImage::GetAlpha() const
1143 {
1144     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
1145
1146     return M_IMGDATA->m_alpha;
1147 }
1148
1149 void wxImage::InitAlpha()
1150 {
1151     wxCHECK_RET( !HasAlpha(), wxT("image already has an alpha channel") );
1152
1153     // initialize memory for alpha channel
1154     SetAlpha();
1155
1156     unsigned char *alpha = M_IMGDATA->m_alpha;
1157     const size_t lenAlpha = M_IMGDATA->m_width * M_IMGDATA->m_height;
1158
1159     if ( HasMask() )
1160     {
1161         // use the mask to initialize the alpha channel.
1162         const unsigned char * const alphaEnd = alpha + lenAlpha;
1163
1164         const unsigned char mr = M_IMGDATA->m_maskRed;
1165         const unsigned char mg = M_IMGDATA->m_maskGreen;
1166         const unsigned char mb = M_IMGDATA->m_maskBlue;
1167         for ( unsigned char *src = M_IMGDATA->m_data;
1168               alpha < alphaEnd;
1169               src += 3, alpha++ )
1170         {
1171             *alpha = (src[0] == mr && src[1] == mg && src[2] == mb)
1172                             ? wxIMAGE_ALPHA_TRANSPARENT
1173                             : wxIMAGE_ALPHA_OPAQUE;
1174         }
1175
1176         M_IMGDATA->m_hasMask = false;
1177     }
1178     else // no mask
1179     {
1180         // make the image fully opaque
1181         memset(alpha, wxIMAGE_ALPHA_OPAQUE, lenAlpha);
1182     }
1183 }
1184
1185 // ----------------------------------------------------------------------------
1186 // mask support
1187 // ----------------------------------------------------------------------------
1188
1189 void wxImage::SetMaskColour( unsigned char r, unsigned char g, unsigned char b )
1190 {
1191     wxCHECK_RET( Ok(), wxT("invalid image") );
1192
1193     M_IMGDATA->m_maskRed = r;
1194     M_IMGDATA->m_maskGreen = g;
1195     M_IMGDATA->m_maskBlue = b;
1196     M_IMGDATA->m_hasMask = true;
1197 }
1198
1199 bool wxImage::GetOrFindMaskColour( unsigned char *r, unsigned char *g, unsigned char *b ) const
1200 {
1201     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1202
1203     if (M_IMGDATA->m_hasMask)
1204     {
1205         if (r) *r = M_IMGDATA->m_maskRed;
1206         if (g) *g = M_IMGDATA->m_maskGreen;
1207         if (b) *b = M_IMGDATA->m_maskBlue;
1208         return true;
1209     }
1210     else
1211     {
1212         FindFirstUnusedColour(r, g, b);
1213         return false;
1214     }
1215 }
1216
1217 unsigned char wxImage::GetMaskRed() const
1218 {
1219     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1220
1221     return M_IMGDATA->m_maskRed;
1222 }
1223
1224 unsigned char wxImage::GetMaskGreen() const
1225 {
1226     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1227
1228     return M_IMGDATA->m_maskGreen;
1229 }
1230
1231 unsigned char wxImage::GetMaskBlue() const
1232 {
1233     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1234
1235     return M_IMGDATA->m_maskBlue;
1236 }
1237
1238 void wxImage::SetMask( bool mask )
1239 {
1240     wxCHECK_RET( Ok(), wxT("invalid image") );
1241
1242     M_IMGDATA->m_hasMask = mask;
1243 }
1244
1245 bool wxImage::HasMask() const
1246 {
1247     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1248
1249     return M_IMGDATA->m_hasMask;
1250 }
1251
1252 bool wxImage::IsTransparent(int x, int y, unsigned char threshold) const
1253 {
1254     long pos = XYToIndex(x, y);
1255     wxCHECK_MSG( pos != -1, false, wxT("invalid image coordinates") );
1256
1257     // check mask
1258     if ( M_IMGDATA->m_hasMask )
1259     {
1260         const unsigned char *p = M_IMGDATA->m_data + 3*pos;
1261         if ( p[0] == M_IMGDATA->m_maskRed &&
1262                 p[1] == M_IMGDATA->m_maskGreen &&
1263                     p[2] == M_IMGDATA->m_maskBlue )
1264         {
1265             return true;
1266         }
1267     }
1268
1269     // then check alpha
1270     if ( M_IMGDATA->m_alpha )
1271     {
1272         if ( M_IMGDATA->m_alpha[pos] < threshold )
1273         {
1274             // transparent enough
1275             return true;
1276         }
1277     }
1278
1279     // not transparent
1280     return false;
1281 }
1282
1283 bool wxImage::SetMaskFromImage(const wxImage& mask,
1284                                unsigned char mr, unsigned char mg, unsigned char mb)
1285 {
1286     // check that the images are the same size
1287     if ( (M_IMGDATA->m_height != mask.GetHeight() ) || (M_IMGDATA->m_width != mask.GetWidth () ) )
1288     {
1289         wxLogError( _("Image and mask have different sizes.") );
1290         return false;
1291     }
1292
1293     // find unused colour
1294     unsigned char r,g,b ;
1295     if (!FindFirstUnusedColour(&r, &g, &b))
1296     {
1297         wxLogError( _("No unused colour in image being masked.") );
1298         return false ;
1299     }
1300
1301     unsigned char *imgdata = GetData();
1302     unsigned char *maskdata = mask.GetData();
1303
1304     const int w = GetWidth();
1305     const int h = GetHeight();
1306
1307     for (int j = 0; j < h; j++)
1308     {
1309         for (int i = 0; i < w; i++)
1310         {
1311             if ((maskdata[0] == mr) && (maskdata[1]  == mg) && (maskdata[2] == mb))
1312             {
1313                 imgdata[0] = r;
1314                 imgdata[1] = g;
1315                 imgdata[2] = b;
1316             }
1317             imgdata  += 3;
1318             maskdata += 3;
1319         }
1320     }
1321
1322     SetMaskColour(r, g, b);
1323     SetMask(true);
1324
1325     return true;
1326 }
1327
1328 bool wxImage::ConvertAlphaToMask(unsigned char threshold)
1329 {
1330     if (!HasAlpha())
1331         return true;
1332
1333     unsigned char mr, mg, mb;
1334     if (!FindFirstUnusedColour(&mr, &mg, &mb))
1335     {
1336         wxLogError( _("No unused colour in image being masked.") );
1337         return false;
1338     }
1339
1340     SetMask(true);
1341     SetMaskColour(mr, mg, mb);
1342
1343     unsigned char *imgdata = GetData();
1344     unsigned char *alphadata = GetAlpha();
1345
1346     int w = GetWidth();
1347     int h = GetHeight();
1348
1349     for (int y = 0; y < h; y++)
1350     {
1351         for (int x = 0; x < w; x++, imgdata += 3, alphadata++)
1352         {
1353             if (*alphadata < threshold)
1354             {
1355                 imgdata[0] = mr;
1356                 imgdata[1] = mg;
1357                 imgdata[2] = mb;
1358             }
1359         }
1360     }
1361
1362     free(M_IMGDATA->m_alpha);
1363     M_IMGDATA->m_alpha = NULL;
1364
1365     return true;
1366 }
1367
1368 // ----------------------------------------------------------------------------
1369 // Palette functions
1370 // ----------------------------------------------------------------------------
1371
1372 #if wxUSE_PALETTE
1373
1374 bool wxImage::HasPalette() const
1375 {
1376     if (!Ok())
1377         return false;
1378
1379     return M_IMGDATA->m_palette.Ok();
1380 }
1381
1382 const wxPalette& wxImage::GetPalette() const
1383 {
1384     wxCHECK_MSG( Ok(), wxNullPalette, wxT("invalid image") );
1385
1386     return M_IMGDATA->m_palette;
1387 }
1388
1389 void wxImage::SetPalette(const wxPalette& palette)
1390 {
1391     wxCHECK_RET( Ok(), wxT("invalid image") );
1392
1393     M_IMGDATA->m_palette = palette;
1394 }
1395
1396 #endif // wxUSE_PALETTE
1397
1398 // ----------------------------------------------------------------------------
1399 // Option functions (arbitrary name/value mapping)
1400 // ----------------------------------------------------------------------------
1401
1402 void wxImage::SetOption(const wxString& name, const wxString& value)
1403 {
1404     wxCHECK_RET( Ok(), wxT("invalid image") );
1405
1406     int idx = M_IMGDATA->m_optionNames.Index(name, false);
1407     if (idx == wxNOT_FOUND)
1408     {
1409         M_IMGDATA->m_optionNames.Add(name);
1410         M_IMGDATA->m_optionValues.Add(value);
1411     }
1412     else
1413     {
1414         M_IMGDATA->m_optionNames[idx] = name;
1415         M_IMGDATA->m_optionValues[idx] = value;
1416     }
1417 }
1418
1419 void wxImage::SetOption(const wxString& name, int value)
1420 {
1421     wxString valStr;
1422     valStr.Printf(wxT("%d"), value);
1423     SetOption(name, valStr);
1424 }
1425
1426 wxString wxImage::GetOption(const wxString& name) const
1427 {
1428     wxCHECK_MSG( Ok(), wxEmptyString, wxT("invalid image") );
1429
1430     int idx = M_IMGDATA->m_optionNames.Index(name, false);
1431     if (idx == wxNOT_FOUND)
1432         return wxEmptyString;
1433     else
1434         return M_IMGDATA->m_optionValues[idx];
1435 }
1436
1437 int wxImage::GetOptionInt(const wxString& name) const
1438 {
1439     return wxAtoi(GetOption(name));
1440 }
1441
1442 bool wxImage::HasOption(const wxString& name) const
1443 {
1444     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1445
1446     return (M_IMGDATA->m_optionNames.Index(name, false) != wxNOT_FOUND);
1447 }
1448
1449 // ----------------------------------------------------------------------------
1450 // image I/O
1451 // ----------------------------------------------------------------------------
1452
1453 bool wxImage::LoadFile( const wxString& filename, long type, int index )
1454 {
1455 #if wxUSE_STREAMS
1456     if (wxFileExists(filename))
1457     {
1458         wxFileInputStream stream(filename);
1459         wxBufferedInputStream bstream( stream );
1460         return LoadFile(bstream, type, index);
1461     }
1462     else
1463     {
1464         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
1465
1466         return false;
1467     }
1468 #else // !wxUSE_STREAMS
1469     return false;
1470 #endif // wxUSE_STREAMS
1471 }
1472
1473 bool wxImage::LoadFile( const wxString& filename, const wxString& mimetype, int index )
1474 {
1475 #if wxUSE_STREAMS
1476     if (wxFileExists(filename))
1477     {
1478         wxFileInputStream stream(filename);
1479         wxBufferedInputStream bstream( stream );
1480         return LoadFile(bstream, mimetype, index);
1481     }
1482     else
1483     {
1484         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
1485
1486         return false;
1487     }
1488 #else // !wxUSE_STREAMS
1489     return false;
1490 #endif // wxUSE_STREAMS
1491 }
1492
1493
1494
1495 bool wxImage::SaveFile( const wxString& filename ) const
1496 {
1497     wxString ext = filename.AfterLast('.').Lower();
1498
1499     wxImageHandler * pHandler = FindHandler(ext, -1);
1500     if (pHandler)
1501     {
1502         SaveFile(filename, pHandler->GetType());
1503         return true;
1504     }
1505
1506     wxLogError(_("Can't save image to file '%s': unknown extension."), filename.c_str());
1507
1508     return false;
1509 }
1510
1511 bool wxImage::SaveFile( const wxString& filename, int type ) const
1512 {
1513 #if wxUSE_STREAMS
1514     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1515
1516     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
1517
1518     wxFileOutputStream stream(filename);
1519
1520     if ( stream.IsOk() )
1521     {
1522         wxBufferedOutputStream bstream( stream );
1523         return SaveFile(bstream, type);
1524     }
1525 #endif // wxUSE_STREAMS
1526
1527     return false;
1528 }
1529
1530 bool wxImage::SaveFile( const wxString& filename, const wxString& mimetype ) const
1531 {
1532 #if wxUSE_STREAMS
1533     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1534
1535     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
1536
1537     wxFileOutputStream stream(filename);
1538
1539     if ( stream.IsOk() )
1540     {
1541         wxBufferedOutputStream bstream( stream );
1542         return SaveFile(bstream, mimetype);
1543     }
1544 #endif // wxUSE_STREAMS
1545
1546     return false;
1547 }
1548
1549 bool wxImage::CanRead( const wxString &name )
1550 {
1551 #if wxUSE_STREAMS
1552   wxFileInputStream stream(name);
1553   return CanRead(stream);
1554 #else
1555   return false;
1556 #endif
1557 }
1558
1559 int wxImage::GetImageCount( const wxString &name, long type )
1560 {
1561 #if wxUSE_STREAMS
1562   wxFileInputStream stream(name);
1563   if (stream.Ok())
1564       return GetImageCount(stream, type);
1565 #endif
1566
1567   return 0;
1568 }
1569
1570 #if wxUSE_STREAMS
1571
1572 bool wxImage::CanRead( wxInputStream &stream )
1573 {
1574     const wxList& list = GetHandlers();
1575
1576     for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
1577     {
1578         wxImageHandler *handler=(wxImageHandler*)node->GetData();
1579         if (handler->CanRead( stream ))
1580             return true;
1581     }
1582
1583     return false;
1584 }
1585
1586 int wxImage::GetImageCount( wxInputStream &stream, long type )
1587 {
1588     wxImageHandler *handler;
1589
1590     if ( type == wxBITMAP_TYPE_ANY )
1591     {
1592         wxList &list=GetHandlers();
1593
1594         for (wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext())
1595         {
1596              handler=(wxImageHandler*)node->GetData();
1597              if ( handler->CanRead(stream) )
1598                  return handler->GetImageCount(stream);
1599
1600         }
1601
1602         wxLogWarning(_("No handler found for image type."));
1603         return 0;
1604     }
1605
1606     handler = FindHandler(type);
1607
1608     if ( !handler )
1609     {
1610         wxLogWarning(_("No image handler for type %d defined."), type);
1611         return false;
1612     }
1613
1614     if ( handler->CanRead(stream) )
1615     {
1616         return handler->GetImageCount(stream);
1617     }
1618     else
1619     {
1620         wxLogError(_("Image file is not of type %d."), type);
1621         return 0;
1622     }
1623 }
1624
1625 bool wxImage::LoadFile( wxInputStream& stream, long type, int index )
1626 {
1627     UnRef();
1628
1629     m_refData = new wxImageRefData;
1630
1631     wxImageHandler *handler;
1632
1633     if ( type == wxBITMAP_TYPE_ANY )
1634     {
1635         wxList &list=GetHandlers();
1636
1637         for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
1638         {
1639              handler=(wxImageHandler*)node->GetData();
1640              if ( handler->CanRead(stream) )
1641                  return handler->LoadFile(this, stream, true/*verbose*/, index);
1642
1643         }
1644
1645         wxLogWarning( _("No handler found for image type.") );
1646         return false;
1647     }
1648
1649     handler = FindHandler(type);
1650
1651     if (handler == 0)
1652     {
1653         wxLogWarning( _("No image handler for type %d defined."), type );
1654
1655         return false;
1656     }
1657
1658     if (stream.IsSeekable() && !handler->CanRead(stream))
1659     {
1660         wxLogError(_("Image file is not of type %d."), type);
1661         return false;
1662     }
1663     else
1664         return handler->LoadFile(this, stream, true/*verbose*/, index);
1665 }
1666
1667 bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int index )
1668 {
1669     UnRef();
1670
1671     m_refData = new wxImageRefData;
1672
1673     wxImageHandler *handler = FindHandlerMime(mimetype);
1674
1675     if (handler == 0)
1676     {
1677         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1678
1679         return false;
1680     }
1681
1682     if (stream.IsSeekable() && !handler->CanRead(stream))
1683     {
1684         wxLogError(_("Image file is not of type %s."), (const wxChar*) mimetype);
1685         return false;
1686     }
1687     else
1688         return handler->LoadFile( this, stream, true/*verbose*/, index );
1689 }
1690
1691 bool wxImage::SaveFile( wxOutputStream& stream, int type ) const
1692 {
1693     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1694
1695     wxImageHandler *handler = FindHandler(type);
1696     if ( !handler )
1697     {
1698         wxLogWarning( _("No image handler for type %d defined."), type );
1699
1700         return false;
1701     }
1702
1703     return handler->SaveFile( (wxImage*)this, stream );
1704 }
1705
1706 bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype ) const
1707 {
1708     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1709
1710     wxImageHandler *handler = FindHandlerMime(mimetype);
1711     if ( !handler )
1712     {
1713         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1714
1715         return false;
1716     }
1717
1718     return handler->SaveFile( (wxImage*)this, stream );
1719 }
1720 #endif // wxUSE_STREAMS
1721
1722 // ----------------------------------------------------------------------------
1723 // image I/O handlers
1724 // ----------------------------------------------------------------------------
1725
1726 void wxImage::AddHandler( wxImageHandler *handler )
1727 {
1728     // Check for an existing handler of the type being added.
1729     if (FindHandler( handler->GetType() ) == 0)
1730     {
1731         sm_handlers.Append( handler );
1732     }
1733     else
1734     {
1735         // This is not documented behaviour, merely the simplest 'fix'
1736         // for preventing duplicate additions.  If someone ever has
1737         // a good reason to add and remove duplicate handlers (and they
1738         // may) we should probably refcount the duplicates.
1739         //   also an issue in InsertHandler below.
1740
1741         wxLogDebug( _T("Adding duplicate image handler for '%s'"),
1742                     handler->GetName().c_str() );
1743         delete handler;
1744     }
1745 }
1746
1747 void wxImage::InsertHandler( wxImageHandler *handler )
1748 {
1749     // Check for an existing handler of the type being added.
1750     if (FindHandler( handler->GetType() ) == 0)
1751     {
1752         sm_handlers.Insert( handler );
1753     }
1754     else
1755     {
1756         // see AddHandler for additional comments.
1757         wxLogDebug( _T("Inserting duplicate image handler for '%s'"),
1758                     handler->GetName().c_str() );
1759         delete handler;
1760     }
1761 }
1762
1763 bool wxImage::RemoveHandler( const wxString& name )
1764 {
1765     wxImageHandler *handler = FindHandler(name);
1766     if (handler)
1767     {
1768         sm_handlers.DeleteObject(handler);
1769         delete handler;
1770         return true;
1771     }
1772     else
1773         return false;
1774 }
1775
1776 wxImageHandler *wxImage::FindHandler( const wxString& name )
1777 {
1778     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1779     while (node)
1780     {
1781         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1782         if (handler->GetName().Cmp(name) == 0) return handler;
1783
1784         node = node->GetNext();
1785     }
1786     return 0;
1787 }
1788
1789 wxImageHandler *wxImage::FindHandler( const wxString& extension, long bitmapType )
1790 {
1791     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1792     while (node)
1793     {
1794         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1795         if ( (handler->GetExtension().Cmp(extension) == 0) &&
1796             (bitmapType == -1 || handler->GetType() == bitmapType) )
1797             return handler;
1798         node = node->GetNext();
1799     }
1800     return 0;
1801 }
1802
1803 wxImageHandler *wxImage::FindHandler( long bitmapType )
1804 {
1805     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1806     while (node)
1807     {
1808         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1809         if (handler->GetType() == bitmapType) return handler;
1810         node = node->GetNext();
1811     }
1812     return 0;
1813 }
1814
1815 wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype )
1816 {
1817     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1818     while (node)
1819     {
1820         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1821         if (handler->GetMimeType().IsSameAs(mimetype, false)) return handler;
1822         node = node->GetNext();
1823     }
1824     return 0;
1825 }
1826
1827 void wxImage::InitStandardHandlers()
1828 {
1829 #if wxUSE_STREAMS
1830     AddHandler(new wxBMPHandler);
1831 #endif // wxUSE_STREAMS
1832 }
1833
1834 void wxImage::CleanUpHandlers()
1835 {
1836     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1837     while (node)
1838     {
1839         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1840         wxList::compatibility_iterator next = node->GetNext();
1841         delete handler;
1842         node = next;
1843     }
1844
1845     sm_handlers.Clear();
1846 }
1847
1848 wxString wxImage::GetImageExtWildcard()
1849 {
1850     wxString fmts;
1851
1852     wxList& Handlers = wxImage::GetHandlers();
1853     wxList::compatibility_iterator Node = Handlers.GetFirst();
1854     while ( Node )
1855     {
1856         wxImageHandler* Handler = (wxImageHandler*)Node->GetData();
1857         fmts += wxT("*.") + Handler->GetExtension();
1858         Node = Node->GetNext();
1859         if ( Node ) fmts += wxT(";");
1860     }
1861
1862     return wxT("(") + fmts + wxT(")|") + fmts;
1863 }
1864
1865 wxImage::HSVValue wxImage::RGBtoHSV(const RGBValue& rgb)
1866 {
1867     const double red = rgb.red / 255.0,
1868                  green = rgb.green / 255.0,
1869                  blue = rgb.blue / 255.0;
1870
1871     // find the min and max intensity (and remember which one was it for the
1872     // latter)
1873     double minimumRGB = red;
1874     if ( green < minimumRGB )
1875         minimumRGB = green;
1876     if ( blue < minimumRGB )
1877         minimumRGB = blue;
1878
1879     enum { RED, GREEN, BLUE } chMax = RED;
1880     double maximumRGB = red;
1881     if ( green > maximumRGB )
1882     {
1883         chMax = GREEN;
1884         maximumRGB = green;
1885     }
1886     if ( blue > maximumRGB )
1887     {
1888         chMax = BLUE;
1889         maximumRGB = blue;
1890     }
1891
1892     const double value = maximumRGB;
1893
1894     double hue = 0.0, saturation;
1895     const double deltaRGB = maximumRGB - minimumRGB;
1896     if ( wxIsNullDouble(deltaRGB) )
1897     {
1898         // Gray has no color
1899         hue = 0.0;
1900         saturation = 0.0;
1901     }
1902     else
1903     {
1904         switch ( chMax )
1905         {
1906             case RED:
1907                 hue = (green - blue) / deltaRGB;
1908                 break;
1909
1910             case GREEN:
1911                 hue = 2.0 + (blue - red) / deltaRGB;
1912                 break;
1913
1914             case BLUE:
1915                 hue = 4.0 + (red - green) / deltaRGB;
1916                 break;
1917
1918             default:
1919                 wxFAIL_MSG(wxT("hue not specified"));
1920                 break;
1921         }
1922
1923         hue /= 6.0;
1924
1925         if ( hue < 0.0 )
1926             hue += 1.0;
1927
1928         saturation = deltaRGB / maximumRGB;
1929     }
1930
1931     return HSVValue(hue, saturation, value);
1932 }
1933
1934 wxImage::RGBValue wxImage::HSVtoRGB(const HSVValue& hsv)
1935 {
1936     double red, green, blue;
1937
1938     if ( wxIsNullDouble(hsv.saturation) )
1939     {
1940         // Grey
1941         red = hsv.value;
1942         green = hsv.value;
1943         blue = hsv.value;
1944     }
1945     else // not grey
1946     {
1947         double hue = hsv.hue * 6.0;      // sector 0 to 5
1948         int i = (int)floor(hue);
1949         double f = hue - i;          // fractional part of h
1950         double p = hsv.value * (1.0 - hsv.saturation);
1951
1952         switch (i)
1953         {
1954             case 0:
1955                 red = hsv.value;
1956                 green = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
1957                 blue = p;
1958                 break;
1959
1960             case 1:
1961                 red = hsv.value * (1.0 - hsv.saturation * f);
1962                 green = hsv.value;
1963                 blue = p;
1964                 break;
1965
1966             case 2:
1967                 red = p;
1968                 green = hsv.value;
1969                 blue = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
1970                 break;
1971
1972             case 3:
1973                 red = p;
1974                 green = hsv.value * (1.0 - hsv.saturation * f);
1975                 blue = hsv.value;
1976                 break;
1977
1978             case 4:
1979                 red = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
1980                 green = p;
1981                 blue = hsv.value;
1982                 break;
1983
1984             default:    // case 5:
1985                 red = hsv.value;
1986                 green = p;
1987                 blue = hsv.value * (1.0 - hsv.saturation * f);
1988                 break;
1989         }
1990     }
1991
1992     return RGBValue((unsigned char)(red * 255.0),
1993                     (unsigned char)(green * 255.0),
1994                     (unsigned char)(blue * 255.0));
1995 }
1996
1997 /*
1998  * Rotates the hue of each pixel of the image. angle is a double in the range
1999  * -1.0..1.0 where -1.0 is -360 degrees and 1.0 is 360 degrees
2000  */
2001 void wxImage::RotateHue(double angle)
2002 {
2003     unsigned char *srcBytePtr;
2004     unsigned char *dstBytePtr;
2005     unsigned long count;
2006     wxImage::HSVValue hsv;
2007     wxImage::RGBValue rgb;
2008
2009     wxASSERT (angle >= -1.0 && angle <= 1.0);
2010     count = M_IMGDATA->m_width * M_IMGDATA->m_height;
2011     if ( count > 0 && !wxIsNullDouble(angle) )
2012     {
2013         srcBytePtr = M_IMGDATA->m_data;
2014         dstBytePtr = srcBytePtr;
2015         do
2016         {
2017             rgb.red = *srcBytePtr++;
2018             rgb.green = *srcBytePtr++;
2019             rgb.blue = *srcBytePtr++;
2020             hsv = RGBtoHSV(rgb);
2021
2022             hsv.hue = hsv.hue + angle;
2023             if (hsv.hue > 1.0)
2024                 hsv.hue = hsv.hue - 1.0;
2025             else if (hsv.hue < 0.0)
2026                 hsv.hue = hsv.hue + 1.0;
2027
2028             rgb = HSVtoRGB(hsv);
2029             *dstBytePtr++ = rgb.red;
2030             *dstBytePtr++ = rgb.green;
2031             *dstBytePtr++ = rgb.blue;
2032         } while (--count != 0);
2033     }
2034 }
2035
2036 //-----------------------------------------------------------------------------
2037 // wxImageHandler
2038 //-----------------------------------------------------------------------------
2039
2040 IMPLEMENT_ABSTRACT_CLASS(wxImageHandler,wxObject)
2041
2042 #if wxUSE_STREAMS
2043 bool wxImageHandler::LoadFile( wxImage *WXUNUSED(image), wxInputStream& WXUNUSED(stream), bool WXUNUSED(verbose), int WXUNUSED(index) )
2044 {
2045     return false;
2046 }
2047
2048 bool wxImageHandler::SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream), bool WXUNUSED(verbose) )
2049 {
2050     return false;
2051 }
2052
2053 int wxImageHandler::GetImageCount( wxInputStream& WXUNUSED(stream) )
2054 {
2055     return 1;
2056 }
2057
2058 bool wxImageHandler::CanRead( const wxString& name )
2059 {
2060     if (wxFileExists(name))
2061     {
2062         wxFileInputStream stream(name);
2063         return CanRead(stream);
2064     }
2065
2066     wxLogError( _("Can't check image format of file '%s': file does not exist."), name.c_str() );
2067
2068     return false;
2069 }
2070
2071 bool wxImageHandler::CallDoCanRead(wxInputStream& stream)
2072 {
2073     wxFileOffset posOld = stream.TellI();
2074     if ( posOld == wxInvalidOffset )
2075     {
2076         // can't test unseekable stream
2077         return false;
2078     }
2079
2080     bool ok = DoCanRead(stream);
2081
2082     // restore the old position to be able to test other formats and so on
2083     if ( stream.SeekI(posOld) == wxInvalidOffset )
2084     {
2085         wxLogDebug(_T("Failed to rewind the stream in wxImageHandler!"));
2086
2087         // reading would fail anyhow as we're not at the right position
2088         return false;
2089     }
2090
2091     return ok;
2092 }
2093
2094 #endif // wxUSE_STREAMS
2095
2096 // ----------------------------------------------------------------------------
2097 // image histogram stuff
2098 // ----------------------------------------------------------------------------
2099
2100 bool
2101 wxImageHistogram::FindFirstUnusedColour(unsigned char *r,
2102                                         unsigned char *g,
2103                                         unsigned char *b,
2104                                         unsigned char r2,
2105                                         unsigned char b2,
2106                                         unsigned char g2) const
2107 {
2108     unsigned long key = MakeKey(r2, g2, b2);
2109
2110     while ( find(key) != end() )
2111     {
2112         // color already used
2113         r2++;
2114         if ( r2 >= 255 )
2115         {
2116             r2 = 0;
2117             g2++;
2118             if ( g2 >= 255 )
2119             {
2120                 g2 = 0;
2121                 b2++;
2122                 if ( b2 >= 255 )
2123                 {
2124                     wxLogError(_("No unused colour in image.") );
2125                     return false;
2126                 }
2127             }
2128         }
2129
2130         key = MakeKey(r2, g2, b2);
2131     }
2132
2133     if ( r )
2134         *r = r2;
2135     if ( g )
2136         *g = g2;
2137     if ( b )
2138         *b = b2;
2139
2140     return true;
2141 }
2142
2143 bool
2144 wxImage::FindFirstUnusedColour(unsigned char *r,
2145                                unsigned char *g,
2146                                unsigned char *b,
2147                                unsigned char r2,
2148                                unsigned char b2,
2149                                unsigned char g2) const
2150 {
2151     wxImageHistogram histogram;
2152
2153     ComputeHistogram(histogram);
2154
2155     return histogram.FindFirstUnusedColour(r, g, b, r2, g2, b2);
2156 }
2157
2158
2159
2160 // GRG, Dic/99
2161 // Counts and returns the number of different colours. Optionally stops
2162 // when it exceeds 'stopafter' different colours. This is useful, for
2163 // example, to see if the image can be saved as 8-bit (256 colour or
2164 // less, in this case it would be invoked as CountColours(256)). Default
2165 // value for stopafter is -1 (don't care).
2166 //
2167 unsigned long wxImage::CountColours( unsigned long stopafter ) const
2168 {
2169     wxHashTable h;
2170     wxObject dummy;
2171     unsigned char r, g, b;
2172     unsigned char *p;
2173     unsigned long size, nentries, key;
2174
2175     p = GetData();
2176     size = GetWidth() * GetHeight();
2177     nentries = 0;
2178
2179     for (unsigned long j = 0; (j < size) && (nentries <= stopafter) ; j++)
2180     {
2181         r = *(p++);
2182         g = *(p++);
2183         b = *(p++);
2184         key = wxImageHistogram::MakeKey(r, g, b);
2185
2186         if (h.Get(key) == NULL)
2187         {
2188             h.Put(key, &dummy);
2189             nentries++;
2190         }
2191     }
2192
2193     return nentries;
2194 }
2195
2196
2197 unsigned long wxImage::ComputeHistogram( wxImageHistogram &h ) const
2198 {
2199     unsigned char *p = GetData();
2200     unsigned long nentries = 0;
2201
2202     h.clear();
2203
2204     const unsigned long size = GetWidth() * GetHeight();
2205
2206     unsigned char r, g, b;
2207     for ( unsigned long n = 0; n < size; n++ )
2208     {
2209         r = *p++;
2210         g = *p++;
2211         b = *p++;
2212
2213         wxImageHistogramEntry& entry = h[wxImageHistogram::MakeKey(r, g, b)];
2214
2215         if ( entry.value++ == 0 )
2216             entry.index = nentries++;
2217     }
2218
2219     return nentries;
2220 }
2221
2222 /*
2223  * Rotation code by Carlos Moreno
2224  */
2225
2226 // GRG: I've removed wxRotationPoint - we already have wxRealPoint which
2227 //      does exactly the same thing. And I also got rid of wxRotationPixel
2228 //      bacause of potential problems in architectures where alignment
2229 //      is an issue, so I had to rewrite parts of the code.
2230
2231 static const double gs_Epsilon = 1e-10;
2232
2233 static inline int wxCint (double x)
2234 {
2235     return (x > 0) ? (int) (x + 0.5) : (int) (x - 0.5);
2236 }
2237
2238
2239 // Auxiliary function to rotate a point (x,y) with respect to point p0
2240 // make it inline and use a straight return to facilitate optimization
2241 // also, the function receives the sine and cosine of the angle to avoid
2242 // repeating the time-consuming calls to these functions -- sin/cos can
2243 // be computed and stored in the calling function.
2244
2245 inline wxRealPoint rotated_point (const wxRealPoint & p, double cos_angle, double sin_angle, const wxRealPoint & p0)
2246 {
2247     return wxRealPoint (p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle,
2248                         p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle);
2249 }
2250
2251 inline wxRealPoint rotated_point (double x, double y, double cos_angle, double sin_angle, const wxRealPoint & p0)
2252 {
2253     return rotated_point (wxRealPoint(x,y), cos_angle, sin_angle, p0);
2254 }
2255
2256 wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool interpolating, wxPoint * offset_after_rotation) const
2257 {
2258     int i;
2259     angle = -angle;     // screen coordinates are a mirror image of "real" coordinates
2260
2261     bool has_alpha = HasAlpha();
2262
2263     // Create pointer-based array to accelerate access to wxImage's data
2264     unsigned char ** data = new unsigned char * [GetHeight()];
2265     data[0] = GetData();
2266     for (i = 1; i < GetHeight(); i++)
2267         data[i] = data[i - 1] + (3 * GetWidth());
2268
2269     // Same for alpha channel
2270     unsigned char ** alpha = NULL;
2271     if (has_alpha)
2272     {
2273         alpha = new unsigned char * [GetHeight()];
2274         alpha[0] = GetAlpha();
2275         for (i = 1; i < GetHeight(); i++)
2276             alpha[i] = alpha[i - 1] + GetWidth();
2277     }
2278
2279     // precompute coefficients for rotation formula
2280     // (sine and cosine of the angle)
2281     const double cos_angle = cos(angle);
2282     const double sin_angle = sin(angle);
2283
2284     // Create new Image to store the result
2285     // First, find rectangle that covers the rotated image;  to do that,
2286     // rotate the four corners
2287
2288     const wxRealPoint p0(centre_of_rotation.x, centre_of_rotation.y);
2289
2290     wxRealPoint p1 = rotated_point (0, 0, cos_angle, sin_angle, p0);
2291     wxRealPoint p2 = rotated_point (0, GetHeight(), cos_angle, sin_angle, p0);
2292     wxRealPoint p3 = rotated_point (GetWidth(), 0, cos_angle, sin_angle, p0);
2293     wxRealPoint p4 = rotated_point (GetWidth(), GetHeight(), cos_angle, sin_angle, p0);
2294
2295     int x1a = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x)));
2296     int y1a = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y)));
2297     int x2a = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x)));
2298     int y2a = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y)));
2299
2300     // Create rotated image
2301     wxImage rotated (x2a - x1a + 1, y2a - y1a + 1, false);
2302     // With alpha channel
2303     if (has_alpha)
2304         rotated.SetAlpha();
2305
2306     if (offset_after_rotation != NULL)
2307     {
2308         *offset_after_rotation = wxPoint (x1a, y1a);
2309     }
2310
2311     // GRG: The rotated (destination) image is always accessed
2312     //      sequentially, so there is no need for a pointer-based
2313     //      array here (and in fact it would be slower).
2314     //
2315     unsigned char * dst = rotated.GetData();
2316
2317     unsigned char * alpha_dst = NULL;
2318     if (has_alpha)
2319         alpha_dst = rotated.GetAlpha();
2320
2321     // GRG: if the original image has a mask, use its RGB values
2322     //      as the blank pixel, else, fall back to default (black).
2323     //
2324     unsigned char blank_r = 0;
2325     unsigned char blank_g = 0;
2326     unsigned char blank_b = 0;
2327
2328     if (HasMask())
2329     {
2330         blank_r = GetMaskRed();
2331         blank_g = GetMaskGreen();
2332         blank_b = GetMaskBlue();
2333         rotated.SetMaskColour( blank_r, blank_g, blank_b );
2334     }
2335
2336     // Now, for each point of the rotated image, find where it came from, by
2337     // performing an inverse rotation (a rotation of -angle) and getting the
2338     // pixel at those coordinates
2339
2340     // GRG: I've taken the (interpolating) test out of the loops, so that
2341     //      it is done only once, instead of repeating it for each pixel.
2342
2343     int x;
2344     if (interpolating)
2345     {
2346         for (int y = 0; y < rotated.GetHeight(); y++)
2347         {
2348             for (x = 0; x < rotated.GetWidth(); x++)
2349             {
2350                 wxRealPoint src = rotated_point (x + x1a, y + y1a, cos_angle, -sin_angle, p0);
2351
2352                 if (-0.25 < src.x && src.x < GetWidth() - 0.75 &&
2353                     -0.25 < src.y && src.y < GetHeight() - 0.75)
2354                 {
2355                     // interpolate using the 4 enclosing grid-points.  Those
2356                     // points can be obtained using floor and ceiling of the
2357                     // exact coordinates of the point
2358                     int x1, y1, x2, y2;
2359
2360                     if (0 < src.x && src.x < GetWidth() - 1)
2361                     {
2362                         x1 = wxCint(floor(src.x));
2363                         x2 = wxCint(ceil(src.x));
2364                     }
2365                     else    // else means that x is near one of the borders (0 or width-1)
2366                     {
2367                         x1 = x2 = wxCint (src.x);
2368                     }
2369
2370                     if (0 < src.y && src.y < GetHeight() - 1)
2371                     {
2372                         y1 = wxCint(floor(src.y));
2373                         y2 = wxCint(ceil(src.y));
2374                     }
2375                     else
2376                     {
2377                         y1 = y2 = wxCint (src.y);
2378                     }
2379
2380                     // get four points and the distances (square of the distance,
2381                     // for efficiency reasons) for the interpolation formula
2382
2383                     // GRG: Do not calculate the points until they are
2384                     //      really needed -- this way we can calculate
2385                     //      just one, instead of four, if d1, d2, d3
2386                     //      or d4 are < gs_Epsilon
2387
2388                     const double d1 = (src.x - x1) * (src.x - x1) + (src.y - y1) * (src.y - y1);
2389                     const double d2 = (src.x - x2) * (src.x - x2) + (src.y - y1) * (src.y - y1);
2390                     const double d3 = (src.x - x2) * (src.x - x2) + (src.y - y2) * (src.y - y2);
2391                     const double d4 = (src.x - x1) * (src.x - x1) + (src.y - y2) * (src.y - y2);
2392
2393                     // Now interpolate as a weighted average of the four surrounding
2394                     // points, where the weights are the distances to each of those points
2395
2396                     // If the point is exactly at one point of the grid of the source
2397                     // image, then don't interpolate -- just assign the pixel
2398
2399                     if (d1 < gs_Epsilon)        // d1,d2,d3,d4 are positive -- no need for abs()
2400                     {
2401                         unsigned char *p = data[y1] + (3 * x1);
2402                         *(dst++) = *(p++);
2403                         *(dst++) = *(p++);
2404                         *(dst++) = *p;
2405
2406                         if (has_alpha)
2407                             *(alpha_dst++) = *(alpha[y1] + x1);
2408                     }
2409                     else if (d2 < gs_Epsilon)
2410                     {
2411                         unsigned char *p = data[y1] + (3 * x2);
2412                         *(dst++) = *(p++);
2413                         *(dst++) = *(p++);
2414                         *(dst++) = *p;
2415
2416                         if (has_alpha)
2417                             *(alpha_dst++) = *(alpha[y1] + x2);
2418                     }
2419                     else if (d3 < gs_Epsilon)
2420                     {
2421                         unsigned char *p = data[y2] + (3 * x2);
2422                         *(dst++) = *(p++);
2423                         *(dst++) = *(p++);
2424                         *(dst++) = *p;
2425
2426                         if (has_alpha)
2427                             *(alpha_dst++) = *(alpha[y2] + x2);
2428                     }
2429                     else if (d4 < gs_Epsilon)
2430                     {
2431                         unsigned char *p = data[y2] + (3 * x1);
2432                         *(dst++) = *(p++);
2433                         *(dst++) = *(p++);
2434                         *(dst++) = *p;
2435
2436                         if (has_alpha)
2437                             *(alpha_dst++) = *(alpha[y2] + x1);
2438                     }
2439                     else
2440                     {
2441                         // weights for the weighted average are proportional to the inverse of the distance
2442                         unsigned char *v1 = data[y1] + (3 * x1);
2443                         unsigned char *v2 = data[y1] + (3 * x2);
2444                         unsigned char *v3 = data[y2] + (3 * x2);
2445                         unsigned char *v4 = data[y2] + (3 * x1);
2446
2447                         const double w1 = 1/d1, w2 = 1/d2, w3 = 1/d3, w4 = 1/d4;
2448
2449                         // GRG: Unrolled.
2450
2451                         *(dst++) = (unsigned char)
2452                             ( (w1 * *(v1++) + w2 * *(v2++) +
2453                                w3 * *(v3++) + w4 * *(v4++)) /
2454                               (w1 + w2 + w3 + w4) );
2455                         *(dst++) = (unsigned char)
2456                             ( (w1 * *(v1++) + w2 * *(v2++) +
2457                                w3 * *(v3++) + w4 * *(v4++)) /
2458                               (w1 + w2 + w3 + w4) );
2459                         *(dst++) = (unsigned char)
2460                             ( (w1 * *v1 + w2 * *v2 +
2461                                w3 * *v3 + w4 * *v4) /
2462                               (w1 + w2 + w3 + w4) );
2463
2464                         if (has_alpha)
2465                         {
2466                             v1 = alpha[y1] + (x1);
2467                             v2 = alpha[y1] + (x2);
2468                             v3 = alpha[y2] + (x2);
2469                             v4 = alpha[y2] + (x1);
2470
2471                             *(alpha_dst++) = (unsigned char)
2472                                 ( (w1 * *v1 + w2 * *v2 +
2473                                    w3 * *v3 + w4 * *v4) /
2474                                   (w1 + w2 + w3 + w4) );
2475                         }
2476                     }
2477                 }
2478                 else
2479                 {
2480                     *(dst++) = blank_r;
2481                     *(dst++) = blank_g;
2482                     *(dst++) = blank_b;
2483
2484                     if (has_alpha)
2485                         *(alpha_dst++) = 0;
2486                 }
2487             }
2488         }
2489     }
2490     else    // not interpolating
2491     {
2492         for (int y = 0; y < rotated.GetHeight(); y++)
2493         {
2494             for (x = 0; x < rotated.GetWidth(); x++)
2495             {
2496                 wxRealPoint src = rotated_point (x + x1a, y + y1a, cos_angle, -sin_angle, p0);
2497
2498                 const int xs = wxCint (src.x);      // wxCint rounds to the
2499                 const int ys = wxCint (src.y);      // closest integer
2500
2501                 if (0 <= xs && xs < GetWidth() &&
2502                     0 <= ys && ys < GetHeight())
2503                 {
2504                     unsigned char *p = data[ys] + (3 * xs);
2505                     *(dst++) = *(p++);
2506                     *(dst++) = *(p++);
2507                     *(dst++) = *p;
2508
2509                     if (has_alpha)
2510                         *(alpha_dst++) = *(alpha[ys] + (xs));
2511                 }
2512                 else
2513                 {
2514                     *(dst++) = blank_r;
2515                     *(dst++) = blank_g;
2516                     *(dst++) = blank_b;
2517
2518                     if (has_alpha)
2519                         *(alpha_dst++) = 255;
2520                 }
2521             }
2522         }
2523     }
2524
2525     delete [] data;
2526
2527     if (has_alpha)
2528         delete [] alpha;
2529
2530     return rotated;
2531 }
2532
2533
2534
2535
2536
2537 // A module to allow wxImage initialization/cleanup
2538 // without calling these functions from app.cpp or from
2539 // the user's application.
2540
2541 class wxImageModule: public wxModule
2542 {
2543 DECLARE_DYNAMIC_CLASS(wxImageModule)
2544 public:
2545     wxImageModule() {}
2546     bool OnInit() { wxImage::InitStandardHandlers(); return true; };
2547     void OnExit() { wxImage::CleanUpHandlers(); };
2548 };
2549
2550 IMPLEMENT_DYNAMIC_CLASS(wxImageModule, wxModule)
2551
2552
2553 #endif // wxUSE_IMAGE