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
 712     subRect.Intersect(finalRect);
 713
 714     if (!subRect.IsEmpty())
 715     {
 716         if ((subRect.GetWidth() == width) && (subRect.GetHeight() == height))
 717             image.Paste(*this, pos.x, pos.y);
 718         else
 719             image.Paste(GetSubImage(subRect), pos.x, pos.y);
 720     }
 721
 722     return image;
 723 }
 724
 725 void wxImage::Paste( const wxImage &image, int x, int y )
 726 {
 727     wxCHECK_RET( Ok(), wxT("invalid image") );
 728     wxCHECK_RET( image.Ok(), wxT("invalid image") );
 729
 730     int xx = 0;
 731     int yy = 0;
 732     int width = image.GetWidth();
 733     int height = image.GetHeight();
 734
 735     if (x < 0)
 736     {
 737         xx = -x;
 738         width += x;
 739     }
 740     if (y < 0)
 741     {
 742         yy = -y;
 743         height += y;
 744     }
 745
 746     if ((x+xx)+width > M_IMGDATA->m_width)
 747         width = M_IMGDATA->m_width - (x+xx);
 748     if ((y+yy)+height > M_IMGDATA->m_height)
 749         height = M_IMGDATA->m_height - (y+yy);
 750
 751     if (width < 1) return;
 752     if (height < 1) return;
 753
 754     if ((!HasMask() && !image.HasMask()) ||
 755         (HasMask() && !image.HasMask()) ||
 756        ((HasMask() && image.HasMask() &&
 757          (GetMaskRed()==image.GetMaskRed()) &&
 758          (GetMaskGreen()==image.GetMaskGreen()) &&
 759          (GetMaskBlue()==image.GetMaskBlue()))))
 760     {
 761         width *= 3;
 762         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 763         int source_step = image.GetWidth()*3;
 764
 765         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 766         int target_step = M_IMGDATA->m_width*3;
 767         for (int j = 0; j < height; j++)
 768         {
 769             memcpy( target_data, source_data, width );
 770             source_data += source_step;
 771             target_data += target_step;
 772         }
 773         return;
 774     }
 775
 776     if (!HasMask() && image.HasMask())
 777     {
 778         unsigned char r = image.GetMaskRed();
 779         unsigned char g = image.GetMaskGreen();
 780         unsigned char b = image.GetMaskBlue();
 781
 782         width *= 3;
 783         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 784         int source_step = image.GetWidth()*3;
 785
 786         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 787         int target_step = M_IMGDATA->m_width*3;
 788
 789         for (int j = 0; j < height; j++)
 790         {
 791             for (int i = 0; i < width; i+=3)
 792             {
 793                 if ((source_data[i]   != r) &&
 794                     (source_data[i+1] != g) &&
 795                     (source_data[i+2] != b))
 796                 {
 797                     memcpy( target_data+i, source_data+i, 3 );
 798                 }
 799             }
 800             source_data += source_step;
 801             target_data += target_step;
 802         }
 803     }
 804 }
 805
 806 void wxImage::Replace( unsigned char r1, unsigned char g1, unsigned char b1,
 807                        unsigned char r2, unsigned char g2, unsigned char b2 )
 808 {
 809     wxCHECK_RET( Ok(), wxT("invalid image") );
 810
 811     unsigned char *data = GetData();
 812
 813     const int w = GetWidth();
 814     const int h = GetHeight();
 815
 816     for (int j = 0; j < h; j++)
 817         for (int i = 0; i < w; i++)
 818         {
 819             if ((data[0] == r1) && (data[1] == g1) && (data[2] == b1))
 820             {
 821                 data[0] = r2;
 822                 data[1] = g2;
 823                 data[2] = b2;
 824             }
 825             data += 3;
 826         }
 827 }
 828
 829 wxImage wxImage::ConvertToGreyscale( double lr, double lg, double lb ) const
 830 {
 831     wxImage image;
 832
 833     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 834
 835     image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false);
 836
 837     unsigned char *dest = image.GetData();
 838
 839     wxCHECK_MSG( dest, image, wxT("unable to create image") );
 840
 841     unsigned char *src = M_IMGDATA->m_data;
 842     bool hasMask = M_IMGDATA->m_hasMask;
 843     unsigned char maskRed = M_IMGDATA->m_maskRed;
 844     unsigned char maskGreen = M_IMGDATA->m_maskGreen;
 845     unsigned char maskBlue = M_IMGDATA->m_maskBlue;
 846
 847     if ( hasMask )
 848         image.SetMaskColour(maskRed, maskGreen, maskBlue);
 849
 850     const long size = M_IMGDATA->m_width * M_IMGDATA->m_height;
 851     for ( long i = 0; i < size; i++, src += 3, dest += 3 )
 852     {
 853         // don't modify the mask
 854         if ( hasMask && src[0] == maskRed && src[1] == maskGreen && src[2] == maskBlue )
 855         {
 856             memcpy(dest, src, 3);
 857         }
 858         else
 859         {
 860             // calculate the luma
 861             double luma = (src[0] * lr + src[1] * lg + src[2] * lb) + 0.5;
 862             dest[0] = dest[1] = dest[2] = wx_static_cast(unsigned char, luma);
 863         }
 864     }
 865
 866     return image;
 867 }
 868
 869 wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const
 870 {
 871     wxImage image;
 872
 873     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 874
 875     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 876
 877     unsigned char *data = image.GetData();
 878
 879     wxCHECK_MSG( data, image, wxT("unable to create image") );
 880
 881     if (M_IMGDATA->m_hasMask)
 882     {
 883         if (M_IMGDATA->m_maskRed == r && M_IMGDATA->m_maskGreen == g &&
 884                                          M_IMGDATA->m_maskBlue == b)
 885             image.SetMaskColour( 255, 255, 255 );
 886         else
 887             image.SetMaskColour( 0, 0, 0 );
 888     }
 889
 890     long size = M_IMGDATA->m_height * M_IMGDATA->m_width;
 891
 892     unsigned char *srcd = M_IMGDATA->m_data;
 893     unsigned char *tard = image.GetData();
 894
 895     for ( long i = 0; i < size; i++, srcd += 3, tard += 3 )
 896     {
 897         if (srcd[0] == r && srcd[1] == g && srcd[2] == b)
 898             tard[0] = tard[1] = tard[2] = 255;
 899         else
 900             tard[0] = tard[1] = tard[2] = 0;
 901     }
 902
 903     return image;
 904 }
 905
 906 int wxImage::GetWidth() const
 907 {
 908     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 909
 910     return M_IMGDATA->m_width;
 911 }
 912
 913 int wxImage::GetHeight() const
 914 {
 915     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 916
 917     return M_IMGDATA->m_height;
 918 }
 919
 920 long wxImage::XYToIndex(int x, int y) const
 921 {
 922     if ( Ok() &&
 923             x >= 0 && y >= 0 &&
 924                 x < M_IMGDATA->m_width && y < M_IMGDATA->m_height )
 925     {
 926         return y*M_IMGDATA->m_width + x;
 927     }
 928
 929     return -1;
 930 }
 931
 932 void wxImage::SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b )
 933 {
 934     long pos = XYToIndex(x, y);
 935     wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
 936
 937     pos *= 3;
 938
 939     M_IMGDATA->m_data[ pos   ] = r;
 940     M_IMGDATA->m_data[ pos+1 ] = g;
 941     M_IMGDATA->m_data[ pos+2 ] = b;
 942 }
 943
 944 void wxImage::SetRGB( const wxRect& rect_, unsigned char r, unsigned char g, unsigned char b )
 945 {
 946     wxCHECK_RET( Ok(), wxT("invalid image") );
 947
 948     wxRect rect(rect_);
 949     wxRect imageRect(0, 0, GetWidth(), GetHeight());
 950     if ( rect == wxRect() )
 951     {
 952         rect = imageRect;
 953     }
 954     else
 955     {
 956         wxCHECK_RET( imageRect.Inside(rect.GetTopLeft()) &&
 957                      imageRect.Inside(rect.GetBottomRight()),
 958                      wxT("invalid bounding rectangle") );
 959     }
 960
 961     int x1 = rect.GetLeft(),
 962         y1 = rect.GetTop(),
 963         x2 = rect.GetRight() + 1,
 964         y2 = rect.GetBottom() + 1;
 965
 966     unsigned char *data wxDUMMY_INITIALIZE(NULL);
 967     int x, y, width = GetWidth();
 968     for (y = y1; y < y2; y++)
 969     {
 970         data = M_IMGDATA->m_data + (y*width + x1)*3;
 971         for (x = x1; x < x2; x++)
 972         {
 973             *data++ = r;
 974             *data++ = g;
 975             *data++ = b;
 976         }
 977     }
 978 }
 979
 980 unsigned char wxImage::GetRed( int x, int y ) const
 981 {
 982     long pos = XYToIndex(x, y);
 983     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
 984
 985     pos *= 3;
 986
 987     return M_IMGDATA->m_data[pos];
 988 }
 989
 990 unsigned char wxImage::GetGreen( int x, int y ) const
 991 {
 992     long pos = XYToIndex(x, y);
 993     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
 994
 995     pos *= 3;
 996
 997     return M_IMGDATA->m_data[pos+1];
 998 }
 999
1000 unsigned char wxImage::GetBlue( int x, int y ) const
1001 {
1002     long pos = XYToIndex(x, y);
1003     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
1004
1005     pos *= 3;
1006
1007     return M_IMGDATA->m_data[pos+2];
1008 }
1009
1010 bool wxImage::Ok() const
1011 {
1012     // image of 0 width or height can't be considered ok - at least because it
1013     // causes crashes in ConvertToBitmap() if we don't catch it in time
1014     wxImageRefData *data = M_IMGDATA;
1015     return data && data->m_ok && data->m_width && data->m_height;
1016 }
1017
1018 unsigned char *wxImage::GetData() const
1019 {
1020     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
1021
1022     return M_IMGDATA->m_data;
1023 }
1024
1025 void wxImage::SetData( unsigned char *data, bool static_data  )
1026 {
1027     wxCHECK_RET( Ok(), wxT("invalid image") );
1028
1029     wxImageRefData *newRefData = new wxImageRefData();
1030
1031     newRefData->m_width = M_IMGDATA->m_width;
1032     newRefData->m_height = M_IMGDATA->m_height;
1033     newRefData->m_data = data;
1034     newRefData->m_ok = true;
1035     newRefData->m_maskRed = M_IMGDATA->m_maskRed;
1036     newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
1037     newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
1038     newRefData->m_hasMask = M_IMGDATA->m_hasMask;
1039     newRefData->m_static = static_data;
1040
1041     UnRef();
1042
1043     m_refData = newRefData;
1044 }
1045
1046 void wxImage::SetData( unsigned char *data, int new_width, int new_height, bool static_data )
1047 {
1048     wxImageRefData *newRefData = new wxImageRefData();
1049
1050     if (m_refData)
1051     {
1052         newRefData->m_width = new_width;
1053         newRefData->m_height = new_height;
1054         newRefData->m_data = data;
1055         newRefData->m_ok = true;
1056         newRefData->m_maskRed = M_IMGDATA->m_maskRed;
1057         newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
1058         newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
1059         newRefData->m_hasMask = M_IMGDATA->m_hasMask;
1060     }
1061     else
1062     {
1063         newRefData->m_width = new_width;
1064         newRefData->m_height = new_height;
1065         newRefData->m_data = data;
1066         newRefData->m_ok = true;
1067     }
1068     newRefData->m_static = static_data;
1069
1070     UnRef();
1071
1072     m_refData = newRefData;
1073 }
1074
1075 // ----------------------------------------------------------------------------
1076 // alpha channel support
1077 // ----------------------------------------------------------------------------
1078
1079 void wxImage::SetAlpha(int x, int y, unsigned char alpha)
1080 {
1081     wxCHECK_RET( HasAlpha(), wxT("no alpha channel") );
1082
1083     long pos = XYToIndex(x, y);
1084     wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
1085
1086     M_IMGDATA->m_alpha[pos] = alpha;
1087 }
1088
1089 unsigned char wxImage::GetAlpha(int x, int y) const
1090 {
1091     wxCHECK_MSG( HasAlpha(), 0, wxT("no alpha channel") );
1092
1093     long pos = XYToIndex(x, y);
1094     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
1095
1096     return M_IMGDATA->m_alpha[pos];
1097 }
1098
1099 bool
1100 wxImage::ConvertColourToAlpha(unsigned char r, unsigned char g, unsigned char b)
1101 {
1102     SetAlpha(NULL);
1103
1104     const int w = M_IMGDATA->m_width;
1105     const int h = M_IMGDATA->m_height;
1106
1107     unsigned char *alpha = GetAlpha();
1108     unsigned char *data = GetData();
1109
1110     for ( int y = 0; y < h; y++ )
1111     {
1112         for ( int x = 0; x < w; x++ )
1113         {
1114             *alpha++ = *data;
1115             *data++ = r;
1116             *data++ = g;
1117             *data++ = b;
1118         }
1119     }
1120
1121     return true;
1122 }
1123
1124 void wxImage::SetAlpha( unsigned char *alpha, bool static_data )
1125 {
1126     wxCHECK_RET( Ok(), wxT("invalid image") );
1127
1128     if ( !alpha )
1129     {
1130         alpha = (unsigned char *)malloc(M_IMGDATA->m_width*M_IMGDATA->m_height);
1131     }
1132
1133     free(M_IMGDATA->m_alpha);
1134     M_IMGDATA->m_alpha = alpha;
1135     M_IMGDATA->m_staticAlpha = static_data;
1136 }
1137
1138 unsigned char *wxImage::GetAlpha() const
1139 {
1140     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
1141
1142     return M_IMGDATA->m_alpha;
1143 }
1144
1145 void wxImage::InitAlpha()
1146 {
1147     wxCHECK_RET( !HasAlpha(), wxT("image already has an alpha channel") );
1148
1149     // initialize memory for alpha channel
1150     SetAlpha();
1151
1152     unsigned char *alpha = M_IMGDATA->m_alpha;
1153     const size_t lenAlpha = M_IMGDATA->m_width * M_IMGDATA->m_height;
1154
1155     if ( HasMask() )
1156     {
1157         // use the mask to initialize the alpha channel.
1158         const unsigned char * const alphaEnd = alpha + lenAlpha;
1159
1160         const unsigned char mr = M_IMGDATA->m_maskRed;
1161         const unsigned char mg = M_IMGDATA->m_maskGreen;
1162         const unsigned char mb = M_IMGDATA->m_maskBlue;
1163         for ( unsigned char *src = M_IMGDATA->m_data;
1164               alpha < alphaEnd;
1165               src += 3, alpha++ )
1166         {
1167             *alpha = (src[0] == mr && src[1] == mg && src[2] == mb)
1168                             ? wxIMAGE_ALPHA_TRANSPARENT
1169                             : wxIMAGE_ALPHA_OPAQUE;
1170         }
1171
1172         M_IMGDATA->m_hasMask = false;
1173     }
1174     else // no mask
1175     {
1176         // make the image fully opaque
1177         memset(alpha, wxIMAGE_ALPHA_OPAQUE, lenAlpha);
1178     }
1179 }
1180
1181 // ----------------------------------------------------------------------------
1182 // mask support
1183 // ----------------------------------------------------------------------------
1184
1185 void wxImage::SetMaskColour( unsigned char r, unsigned char g, unsigned char b )
1186 {
1187     wxCHECK_RET( Ok(), wxT("invalid image") );
1188
1189     M_IMGDATA->m_maskRed = r;
1190     M_IMGDATA->m_maskGreen = g;
1191     M_IMGDATA->m_maskBlue = b;
1192     M_IMGDATA->m_hasMask = true;
1193 }
1194
1195 bool wxImage::GetOrFindMaskColour( unsigned char *r, unsigned char *g, unsigned char *b ) const
1196 {
1197     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1198
1199     if (M_IMGDATA->m_hasMask)
1200     {
1201         if (r) *r = M_IMGDATA->m_maskRed;
1202         if (g) *g = M_IMGDATA->m_maskGreen;
1203         if (b) *b = M_IMGDATA->m_maskBlue;
1204         return true;
1205     }
1206     else
1207     {
1208         FindFirstUnusedColour(r, g, b);
1209         return false;
1210     }
1211 }
1212
1213 unsigned char wxImage::GetMaskRed() const
1214 {
1215     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1216
1217     return M_IMGDATA->m_maskRed;
1218 }
1219
1220 unsigned char wxImage::GetMaskGreen() const
1221 {
1222     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1223
1224     return M_IMGDATA->m_maskGreen;
1225 }
1226
1227 unsigned char wxImage::GetMaskBlue() const
1228 {
1229     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1230
1231     return M_IMGDATA->m_maskBlue;
1232 }
1233
1234 void wxImage::SetMask( bool mask )
1235 {
1236     wxCHECK_RET( Ok(), wxT("invalid image") );
1237
1238     M_IMGDATA->m_hasMask = mask;
1239 }
1240
1241 bool wxImage::HasMask() const
1242 {
1243     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1244
1245     return M_IMGDATA->m_hasMask;
1246 }
1247
1248 bool wxImage::IsTransparent(int x, int y, unsigned char threshold) const
1249 {
1250     long pos = XYToIndex(x, y);
1251     wxCHECK_MSG( pos != -1, false, wxT("invalid image coordinates") );
1252
1253     // check mask
1254     if ( M_IMGDATA->m_hasMask )
1255     {
1256         const unsigned char *p = M_IMGDATA->m_data + 3*pos;
1257         if ( p[0] == M_IMGDATA->m_maskRed &&
1258                 p[1] == M_IMGDATA->m_maskGreen &&
1259                     p[2] == M_IMGDATA->m_maskBlue )
1260         {
1261             return true;
1262         }
1263     }
1264
1265     // then check alpha
1266     if ( M_IMGDATA->m_alpha )
1267     {
1268         if ( M_IMGDATA->m_alpha[pos] < threshold )
1269         {
1270             // transparent enough
1271             return true;
1272         }
1273     }
1274
1275     // not transparent
1276     return false;
1277 }
1278
1279 bool wxImage::SetMaskFromImage(const wxImage& mask,
1280                                unsigned char mr, unsigned char mg, unsigned char mb)
1281 {
1282     // check that the images are the same size
1283     if ( (M_IMGDATA->m_height != mask.GetHeight() ) || (M_IMGDATA->m_width != mask.GetWidth () ) )
1284     {
1285         wxLogError( _("Image and mask have different sizes.") );
1286         return false;
1287     }
1288
1289     // find unused colour
1290     unsigned char r,g,b ;
1291     if (!FindFirstUnusedColour(&r, &g, &b))
1292     {
1293         wxLogError( _("No unused colour in image being masked.") );
1294         return false ;
1295     }
1296
1297     unsigned char *imgdata = GetData();
1298     unsigned char *maskdata = mask.GetData();
1299
1300     const int w = GetWidth();
1301     const int h = GetHeight();
1302
1303     for (int j = 0; j < h; j++)
1304     {
1305         for (int i = 0; i < w; i++)
1306         {
1307             if ((maskdata[0] == mr) && (maskdata[1]  == mg) && (maskdata[2] == mb))
1308             {
1309                 imgdata[0] = r;
1310                 imgdata[1] = g;
1311                 imgdata[2] = b;
1312             }
1313             imgdata  += 3;
1314             maskdata += 3;
1315         }
1316     }
1317
1318     SetMaskColour(r, g, b);
1319     SetMask(true);
1320
1321     return true;
1322 }
1323
1324 bool wxImage::ConvertAlphaToMask(unsigned char threshold)
1325 {
1326     if (!HasAlpha())
1327         return true;
1328
1329     unsigned char mr, mg, mb;
1330     if (!FindFirstUnusedColour(&mr, &mg, &mb))
1331     {
1332         wxLogError( _("No unused colour in image being masked.") );
1333         return false;
1334     }
1335
1336     SetMask(true);
1337     SetMaskColour(mr, mg, mb);
1338
1339     unsigned char *imgdata = GetData();
1340     unsigned char *alphadata = GetAlpha();
1341
1342     int w = GetWidth();
1343     int h = GetHeight();
1344
1345     for (int y = 0; y < h; y++)
1346     {
1347         for (int x = 0; x < w; x++, imgdata += 3, alphadata++)
1348         {
1349             if (*alphadata < threshold)
1350             {
1351                 imgdata[0] = mr;
1352                 imgdata[1] = mg;
1353                 imgdata[2] = mb;
1354             }
1355         }
1356     }
1357
1358     free(M_IMGDATA->m_alpha);
1359     M_IMGDATA->m_alpha = NULL;
1360
1361     return true;
1362 }
1363
1364 // ----------------------------------------------------------------------------
1365 // Palette functions
1366 // ----------------------------------------------------------------------------
1367
1368 #if wxUSE_PALETTE
1369
1370 bool wxImage::HasPalette() const
1371 {
1372     if (!Ok())
1373         return false;
1374
1375     return M_IMGDATA->m_palette.Ok();
1376 }
1377
1378 const wxPalette& wxImage::GetPalette() const
1379 {
1380     wxCHECK_MSG( Ok(), wxNullPalette, wxT("invalid image") );
1381
1382     return M_IMGDATA->m_palette;
1383 }
1384
1385 void wxImage::SetPalette(const wxPalette& palette)
1386 {
1387     wxCHECK_RET( Ok(), wxT("invalid image") );
1388
1389     M_IMGDATA->m_palette = palette;
1390 }
1391
1392 #endif // wxUSE_PALETTE
1393
1394 // ----------------------------------------------------------------------------
1395 // Option functions (arbitrary name/value mapping)
1396 // ----------------------------------------------------------------------------
1397
1398 void wxImage::SetOption(const wxString& name, const wxString& value)
1399 {
1400     wxCHECK_RET( Ok(), wxT("invalid image") );
1401
1402     int idx = M_IMGDATA->m_optionNames.Index(name, false);
1403     if (idx == wxNOT_FOUND)
1404     {
1405         M_IMGDATA->m_optionNames.Add(name);
1406         M_IMGDATA->m_optionValues.Add(value);
1407     }
1408     else
1409     {
1410         M_IMGDATA->m_optionNames[idx] = name;
1411         M_IMGDATA->m_optionValues[idx] = value;
1412     }
1413 }
1414
1415 void wxImage::SetOption(const wxString& name, int value)
1416 {
1417     wxString valStr;
1418     valStr.Printf(wxT("%d"), value);
1419     SetOption(name, valStr);
1420 }
1421
1422 wxString wxImage::GetOption(const wxString& name) const
1423 {
1424     wxCHECK_MSG( Ok(), wxEmptyString, wxT("invalid image") );
1425
1426     int idx = M_IMGDATA->m_optionNames.Index(name, false);
1427     if (idx == wxNOT_FOUND)
1428         return wxEmptyString;
1429     else
1430         return M_IMGDATA->m_optionValues[idx];
1431 }
1432
1433 int wxImage::GetOptionInt(const wxString& name) const
1434 {
1435     return wxAtoi(GetOption(name));
1436 }
1437
1438 bool wxImage::HasOption(const wxString& name) const
1439 {
1440     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1441
1442     return (M_IMGDATA->m_optionNames.Index(name, false) != wxNOT_FOUND);
1443 }
1444
1445 // ----------------------------------------------------------------------------
1446 // image I/O
1447 // ----------------------------------------------------------------------------
1448
1449 bool wxImage::LoadFile( const wxString& filename, long type, int index )
1450 {
1451 #if wxUSE_STREAMS
1452     if (wxFileExists(filename))
1453     {
1454         wxFileInputStream stream(filename);
1455         wxBufferedInputStream bstream( stream );
1456         return LoadFile(bstream, type, index);
1457     }
1458     else
1459     {
1460         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
1461
1462         return false;
1463     }
1464 #else // !wxUSE_STREAMS
1465     return false;
1466 #endif // wxUSE_STREAMS
1467 }
1468
1469 bool wxImage::LoadFile( const wxString& filename, const wxString& mimetype, int index )
1470 {
1471 #if wxUSE_STREAMS
1472     if (wxFileExists(filename))
1473     {
1474         wxFileInputStream stream(filename);
1475         wxBufferedInputStream bstream( stream );
1476         return LoadFile(bstream, mimetype, index);
1477     }
1478     else
1479     {
1480         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
1481
1482         return false;
1483     }
1484 #else // !wxUSE_STREAMS
1485     return false;
1486 #endif // wxUSE_STREAMS
1487 }
1488
1489
1490
1491 bool wxImage::SaveFile( const wxString& filename ) const
1492 {
1493     wxString ext = filename.AfterLast('.').Lower();
1494
1495     wxImageHandler * pHandler = FindHandler(ext, -1);
1496     if (pHandler)
1497     {
1498         SaveFile(filename, pHandler->GetType());
1499         return true;
1500     }
1501
1502     wxLogError(_("Can't save image to file '%s': unknown extension."), filename.c_str());
1503
1504     return false;
1505 }
1506
1507 bool wxImage::SaveFile( const wxString& filename, int type ) const
1508 {
1509 #if wxUSE_STREAMS
1510     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1511
1512     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
1513
1514     wxFileOutputStream stream(filename);
1515
1516     if ( stream.IsOk() )
1517     {
1518         wxBufferedOutputStream bstream( stream );
1519         return SaveFile(bstream, type);
1520     }
1521 #endif // wxUSE_STREAMS
1522
1523     return false;
1524 }
1525
1526 bool wxImage::SaveFile( const wxString& filename, const wxString& mimetype ) const
1527 {
1528 #if wxUSE_STREAMS
1529     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1530
1531     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
1532
1533     wxFileOutputStream stream(filename);
1534
1535     if ( stream.IsOk() )
1536     {
1537         wxBufferedOutputStream bstream( stream );
1538         return SaveFile(bstream, mimetype);
1539     }
1540 #endif // wxUSE_STREAMS
1541
1542     return false;
1543 }
1544
1545 bool wxImage::CanRead( const wxString &name )
1546 {
1547 #if wxUSE_STREAMS
1548   wxFileInputStream stream(name);
1549   return CanRead(stream);
1550 #else
1551   return false;
1552 #endif
1553 }
1554
1555 int wxImage::GetImageCount( const wxString &name, long type )
1556 {
1557 #if wxUSE_STREAMS
1558   wxFileInputStream stream(name);
1559   if (stream.Ok())
1560       return GetImageCount(stream, type);
1561 #endif
1562
1563   return 0;
1564 }
1565
1566 #if wxUSE_STREAMS
1567
1568 bool wxImage::CanRead( wxInputStream &stream )
1569 {
1570     const wxList& list = GetHandlers();
1571
1572     for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
1573     {
1574         wxImageHandler *handler=(wxImageHandler*)node->GetData();
1575         if (handler->CanRead( stream ))
1576             return true;
1577     }
1578
1579     return false;
1580 }
1581
1582 int wxImage::GetImageCount( wxInputStream &stream, long type )
1583 {
1584     wxImageHandler *handler;
1585
1586     if ( type == wxBITMAP_TYPE_ANY )
1587     {
1588         wxList &list=GetHandlers();
1589
1590         for (wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext())
1591         {
1592              handler=(wxImageHandler*)node->GetData();
1593              if ( handler->CanRead(stream) )
1594                  return handler->GetImageCount(stream);
1595
1596         }
1597
1598         wxLogWarning(_("No handler found for image type."));
1599         return 0;
1600     }
1601
1602     handler = FindHandler(type);
1603
1604     if ( !handler )
1605     {
1606         wxLogWarning(_("No image handler for type %d defined."), type);
1607         return false;
1608     }
1609
1610     if ( handler->CanRead(stream) )
1611     {
1612         return handler->GetImageCount(stream);
1613     }
1614     else
1615     {
1616         wxLogError(_("Image file is not of type %d."), type);
1617         return 0;
1618     }
1619 }
1620
1621 bool wxImage::LoadFile( wxInputStream& stream, long type, int index )
1622 {
1623     UnRef();
1624
1625     m_refData = new wxImageRefData;
1626
1627     wxImageHandler *handler;
1628
1629     if ( type == wxBITMAP_TYPE_ANY )
1630     {
1631         wxList &list=GetHandlers();
1632
1633         for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
1634         {
1635              handler=(wxImageHandler*)node->GetData();
1636              if ( handler->CanRead(stream) )
1637                  return handler->LoadFile(this, stream, true/*verbose*/, index);
1638
1639         }
1640
1641         wxLogWarning( _("No handler found for image type.") );
1642         return false;
1643     }
1644
1645     handler = FindHandler(type);
1646
1647     if (handler == 0)
1648     {
1649         wxLogWarning( _("No image handler for type %d defined."), type );
1650
1651         return false;
1652     }
1653
1654     if (stream.IsSeekable() && !handler->CanRead(stream))
1655     {
1656         wxLogError(_("Image file is not of type %d."), type);
1657         return false;
1658     }
1659     else
1660         return handler->LoadFile(this, stream, true/*verbose*/, index);
1661 }
1662
1663 bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int index )
1664 {
1665     UnRef();
1666
1667     m_refData = new wxImageRefData;
1668
1669     wxImageHandler *handler = FindHandlerMime(mimetype);
1670
1671     if (handler == 0)
1672     {
1673         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1674
1675         return false;
1676     }
1677
1678     if (stream.IsSeekable() && !handler->CanRead(stream))
1679     {
1680         wxLogError(_("Image file is not of type %s."), (const wxChar*) mimetype);
1681         return false;
1682     }
1683     else
1684         return handler->LoadFile( this, stream, true/*verbose*/, index );
1685 }
1686
1687 bool wxImage::SaveFile( wxOutputStream& stream, int type ) const
1688 {
1689     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1690
1691     wxImageHandler *handler = FindHandler(type);
1692     if ( !handler )
1693     {
1694         wxLogWarning( _("No image handler for type %d defined."), type );
1695
1696         return false;
1697     }
1698
1699     return handler->SaveFile( (wxImage*)this, stream );
1700 }
1701
1702 bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype ) const
1703 {
1704     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1705
1706     wxImageHandler *handler = FindHandlerMime(mimetype);
1707     if ( !handler )
1708     {
1709         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1710
1711         return false;
1712     }
1713
1714     return handler->SaveFile( (wxImage*)this, stream );
1715 }
1716 #endif // wxUSE_STREAMS
1717
1718 // ----------------------------------------------------------------------------
1719 // image I/O handlers
1720 // ----------------------------------------------------------------------------
1721
1722 void wxImage::AddHandler( wxImageHandler *handler )
1723 {
1724     // Check for an existing handler of the type being added.
1725     if (FindHandler( handler->GetType() ) == 0)
1726     {
1727         sm_handlers.Append( handler );
1728     }
1729     else
1730     {
1731         // This is not documented behaviour, merely the simplest 'fix'
1732         // for preventing duplicate additions.  If someone ever has
1733         // a good reason to add and remove duplicate handlers (and they
1734         // may) we should probably refcount the duplicates.
1735         //   also an issue in InsertHandler below.
1736
1737         wxLogDebug( _T("Adding duplicate image handler for '%s'"),
1738                     handler->GetName().c_str() );
1739         delete handler;
1740     }
1741 }
1742
1743 void wxImage::InsertHandler( wxImageHandler *handler )
1744 {
1745     // Check for an existing handler of the type being added.
1746     if (FindHandler( handler->GetType() ) == 0)
1747     {
1748         sm_handlers.Insert( handler );
1749     }
1750     else
1751     {
1752         // see AddHandler for additional comments.
1753         wxLogDebug( _T("Inserting duplicate image handler for '%s'"),
1754                     handler->GetName().c_str() );
1755         delete handler;
1756     }
1757 }
1758
1759 bool wxImage::RemoveHandler( const wxString& name )
1760 {
1761     wxImageHandler *handler = FindHandler(name);
1762     if (handler)
1763     {
1764         sm_handlers.DeleteObject(handler);
1765         delete handler;
1766         return true;
1767     }
1768     else
1769         return false;
1770 }
1771
1772 wxImageHandler *wxImage::FindHandler( const wxString& name )
1773 {
1774     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1775     while (node)
1776     {
1777         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1778         if (handler->GetName().Cmp(name) == 0) return handler;
1779
1780         node = node->GetNext();
1781     }
1782     return 0;
1783 }
1784
1785 wxImageHandler *wxImage::FindHandler( const wxString& extension, long bitmapType )
1786 {
1787     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1788     while (node)
1789     {
1790         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1791         if ( (handler->GetExtension().Cmp(extension) == 0) &&
1792             (bitmapType == -1 || handler->GetType() == bitmapType) )
1793             return handler;
1794         node = node->GetNext();
1795     }
1796     return 0;
1797 }
1798
1799 wxImageHandler *wxImage::FindHandler( long bitmapType )
1800 {
1801     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1802     while (node)
1803     {
1804         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1805         if (handler->GetType() == bitmapType) return handler;
1806         node = node->GetNext();
1807     }
1808     return 0;
1809 }
1810
1811 wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype )
1812 {
1813     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1814     while (node)
1815     {
1816         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1817         if (handler->GetMimeType().IsSameAs(mimetype, false)) return handler;
1818         node = node->GetNext();
1819     }
1820     return 0;
1821 }
1822
1823 void wxImage::InitStandardHandlers()
1824 {
1825 #if wxUSE_STREAMS
1826     AddHandler(new wxBMPHandler);
1827 #endif // wxUSE_STREAMS
1828 }
1829
1830 void wxImage::CleanUpHandlers()
1831 {
1832     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1833     while (node)
1834     {
1835         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1836         wxList::compatibility_iterator next = node->GetNext();
1837         delete handler;
1838         node = next;
1839     }
1840
1841     sm_handlers.Clear();
1842 }
1843
1844 wxString wxImage::GetImageExtWildcard()
1845 {
1846     wxString fmts;
1847
1848     wxList& Handlers = wxImage::GetHandlers();
1849     wxList::compatibility_iterator Node = Handlers.GetFirst();
1850     while ( Node )
1851     {
1852         wxImageHandler* Handler = (wxImageHandler*)Node->GetData();
1853         fmts += wxT("*.") + Handler->GetExtension();
1854         Node = Node->GetNext();
1855         if ( Node ) fmts += wxT(";");
1856     }
1857
1858     return wxT("(") + fmts + wxT(")|") + fmts;
1859 }
1860
1861 wxImage::HSVValue wxImage::RGBtoHSV(const RGBValue& rgb)
1862 {
1863     const double red = rgb.red / 255.0,
1864                  green = rgb.green / 255.0,
1865                  blue = rgb.blue / 255.0;
1866
1867     // find the min and max intensity (and remember which one was it for the
1868     // latter)
1869     double minimumRGB = red;
1870     if ( green < minimumRGB )
1871         minimumRGB = green;
1872     if ( blue < minimumRGB )
1873         minimumRGB = blue;
1874
1875     enum { RED, GREEN, BLUE } chMax = RED;
1876     double maximumRGB = red;
1877     if ( green > maximumRGB )
1878     {
1879         chMax = GREEN;
1880         maximumRGB = green;
1881     }
1882     if ( blue > maximumRGB )
1883     {
1884         chMax = BLUE;
1885         maximumRGB = blue;
1886     }
1887
1888     const double value = maximumRGB;
1889
1890     double hue = 0.0, saturation;
1891     const double deltaRGB = maximumRGB - minimumRGB;
1892     if ( wxIsNullDouble(deltaRGB) )
1893     {
1894         // Gray has no color
1895         hue = 0.0;
1896         saturation = 0.0;
1897     }
1898     else
1899     {
1900         switch ( chMax )
1901         {
1902             case RED:
1903                 hue = (green - blue) / deltaRGB;
1904                 break;
1905
1906             case GREEN:
1907                 hue = 2.0 + (blue - red) / deltaRGB;
1908                 break;
1909
1910             case BLUE:
1911                 hue = 4.0 + (red - green) / deltaRGB;
1912                 break;
1913
1914             default:
1915                 wxFAIL_MSG(wxT("hue not specified"));
1916                 break;
1917         }
1918
1919         hue /= 6.0;
1920
1921         if ( hue < 0.0 )
1922             hue += 1.0;
1923
1924         saturation = deltaRGB / maximumRGB;
1925     }
1926
1927     return HSVValue(hue, saturation, value);
1928 }
1929
1930 wxImage::RGBValue wxImage::HSVtoRGB(const HSVValue& hsv)
1931 {
1932     double red, green, blue;
1933
1934     if ( wxIsNullDouble(hsv.saturation) )
1935     {
1936         // Grey
1937         red = hsv.value;
1938         green = hsv.value;
1939         blue = hsv.value;
1940     }
1941     else // not grey
1942     {
1943         double hue = hsv.hue * 6.0;      // sector 0 to 5
1944         int i = (int)floor(hue);
1945         double f = hue - i;          // fractional part of h
1946         double p = hsv.value * (1.0 - hsv.saturation);
1947
1948         switch (i)
1949         {
1950             case 0:
1951                 red = hsv.value;
1952                 green = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
1953                 blue = p;
1954                 break;
1955
1956             case 1:
1957                 red = hsv.value * (1.0 - hsv.saturation * f);
1958                 green = hsv.value;
1959                 blue = p;
1960                 break;
1961
1962             case 2:
1963                 red = p;
1964                 green = hsv.value;
1965                 blue = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
1966                 break;
1967
1968             case 3:
1969                 red = p;
1970                 green = hsv.value * (1.0 - hsv.saturation * f);
1971                 blue = hsv.value;
1972                 break;
1973
1974             case 4:
1975                 red = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
1976                 green = p;
1977                 blue = hsv.value;
1978                 break;
1979
1980             default:    // case 5:
1981                 red = hsv.value;
1982                 green = p;
1983                 blue = hsv.value * (1.0 - hsv.saturation * f);
1984                 break;
1985         }
1986     }
1987
1988     return RGBValue((unsigned char)(red * 255.0),
1989                     (unsigned char)(green * 255.0),
1990                     (unsigned char)(blue * 255.0));
1991 }
1992
1993 /*
1994  * Rotates the hue of each pixel of the image. angle is a double in the range
1995  * -1.0..1.0 where -1.0 is -360 degrees and 1.0 is 360 degrees
1996  */
1997 void wxImage::RotateHue(double angle)
1998 {
1999     unsigned char *srcBytePtr;
2000     unsigned char *dstBytePtr;
2001     unsigned long count;
2002     wxImage::HSVValue hsv;
2003     wxImage::RGBValue rgb;
2004
2005     wxASSERT (angle >= -1.0 && angle <= 1.0);
2006     count = M_IMGDATA->m_width * M_IMGDATA->m_height;
2007     if ( count > 0 && !wxIsNullDouble(angle) )
2008     {
2009         srcBytePtr = M_IMGDATA->m_data;
2010         dstBytePtr = srcBytePtr;
2011         do
2012         {
2013             rgb.red = *srcBytePtr++;
2014             rgb.green = *srcBytePtr++;
2015             rgb.blue = *srcBytePtr++;
2016             hsv = RGBtoHSV(rgb);
2017
2018             hsv.hue = hsv.hue + angle;
2019             if (hsv.hue > 1.0)
2020                 hsv.hue = hsv.hue - 1.0;
2021             else if (hsv.hue < 0.0)
2022                 hsv.hue = hsv.hue + 1.0;
2023
2024             rgb = HSVtoRGB(hsv);
2025             *dstBytePtr++ = rgb.red;
2026             *dstBytePtr++ = rgb.green;
2027             *dstBytePtr++ = rgb.blue;
2028         } while (--count != 0);
2029     }
2030 }
2031
2032 //-----------------------------------------------------------------------------
2033 // wxImageHandler
2034 //-----------------------------------------------------------------------------
2035
2036 IMPLEMENT_ABSTRACT_CLASS(wxImageHandler,wxObject)
2037
2038 #if wxUSE_STREAMS
2039 bool wxImageHandler::LoadFile( wxImage *WXUNUSED(image), wxInputStream& WXUNUSED(stream), bool WXUNUSED(verbose), int WXUNUSED(index) )
2040 {
2041     return false;
2042 }
2043
2044 bool wxImageHandler::SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream), bool WXUNUSED(verbose) )
2045 {
2046     return false;
2047 }
2048
2049 int wxImageHandler::GetImageCount( wxInputStream& WXUNUSED(stream) )
2050 {
2051     return 1;
2052 }
2053
2054 bool wxImageHandler::CanRead( const wxString& name )
2055 {
2056     if (wxFileExists(name))
2057     {
2058         wxFileInputStream stream(name);
2059         return CanRead(stream);
2060     }
2061
2062     wxLogError( _("Can't check image format of file '%s': file does not exist."), name.c_str() );
2063
2064     return false;
2065 }
2066
2067 bool wxImageHandler::CallDoCanRead(wxInputStream& stream)
2068 {
2069     wxFileOffset posOld = stream.TellI();
2070     if ( posOld == wxInvalidOffset )
2071     {
2072         // can't test unseekable stream
2073         return false;
2074     }
2075
2076     bool ok = DoCanRead(stream);
2077
2078     // restore the old position to be able to test other formats and so on
2079     if ( stream.SeekI(posOld) == wxInvalidOffset )
2080     {
2081         wxLogDebug(_T("Failed to rewind the stream in wxImageHandler!"));
2082
2083         // reading would fail anyhow as we're not at the right position
2084         return false;
2085     }
2086
2087     return ok;
2088 }
2089
2090 #endif // wxUSE_STREAMS
2091
2092 // ----------------------------------------------------------------------------
2093 // image histogram stuff
2094 // ----------------------------------------------------------------------------
2095
2096 bool
2097 wxImageHistogram::FindFirstUnusedColour(unsigned char *r,
2098                                         unsigned char *g,
2099                                         unsigned char *b,
2100                                         unsigned char r2,
2101                                         unsigned char b2,
2102                                         unsigned char g2) const
2103 {
2104     unsigned long key = MakeKey(r2, g2, b2);
2105
2106     while ( find(key) != end() )
2107     {
2108         // color already used
2109         r2++;
2110         if ( r2 >= 255 )
2111         {
2112             r2 = 0;
2113             g2++;
2114             if ( g2 >= 255 )
2115             {
2116                 g2 = 0;
2117                 b2++;
2118                 if ( b2 >= 255 )
2119                 {
2120                     wxLogError(_("No unused colour in image.") );
2121                     return false;
2122                 }
2123             }
2124         }
2125
2126         key = MakeKey(r2, g2, b2);
2127     }
2128
2129     if ( r )
2130         *r = r2;
2131     if ( g )
2132         *g = g2;
2133     if ( b )
2134         *b = b2;
2135
2136     return true;
2137 }
2138
2139 bool
2140 wxImage::FindFirstUnusedColour(unsigned char *r,
2141                                unsigned char *g,
2142                                unsigned char *b,
2143                                unsigned char r2,
2144                                unsigned char b2,
2145                                unsigned char g2) const
2146 {
2147     wxImageHistogram histogram;
2148
2149     ComputeHistogram(histogram);
2150
2151     return histogram.FindFirstUnusedColour(r, g, b, r2, g2, b2);
2152 }
2153
2154
2155
2156 // GRG, Dic/99
2157 // Counts and returns the number of different colours. Optionally stops
2158 // when it exceeds 'stopafter' different colours. This is useful, for
2159 // example, to see if the image can be saved as 8-bit (256 colour or
2160 // less, in this case it would be invoked as CountColours(256)). Default
2161 // value for stopafter is -1 (don't care).
2162 //
2163 unsigned long wxImage::CountColours( unsigned long stopafter ) const
2164 {
2165     wxHashTable h;
2166     wxObject dummy;
2167     unsigned char r, g, b;
2168     unsigned char *p;
2169     unsigned long size, nentries, key;
2170
2171     p = GetData();
2172     size = GetWidth() * GetHeight();
2173     nentries = 0;
2174
2175     for (unsigned long j = 0; (j < size) && (nentries <= stopafter) ; j++)
2176     {
2177         r = *(p++);
2178         g = *(p++);
2179         b = *(p++);
2180         key = wxImageHistogram::MakeKey(r, g, b);
2181
2182         if (h.Get(key) == NULL)
2183         {
2184             h.Put(key, &dummy);
2185             nentries++;
2186         }
2187     }
2188
2189     return nentries;
2190 }
2191
2192
2193 unsigned long wxImage::ComputeHistogram( wxImageHistogram &h ) const
2194 {
2195     unsigned char *p = GetData();
2196     unsigned long nentries = 0;
2197
2198     h.clear();
2199
2200     const unsigned long size = GetWidth() * GetHeight();
2201
2202     unsigned char r, g, b;
2203     for ( unsigned long n = 0; n < size; n++ )
2204     {
2205         r = *p++;
2206         g = *p++;
2207         b = *p++;
2208
2209         wxImageHistogramEntry& entry = h[wxImageHistogram::MakeKey(r, g, b)];
2210
2211         if ( entry.value++ == 0 )
2212             entry.index = nentries++;
2213     }
2214
2215     return nentries;
2216 }
2217
2218 /*
2219  * Rotation code by Carlos Moreno
2220  */
2221
2222 // GRG: I've removed wxRotationPoint - we already have wxRealPoint which
2223 //      does exactly the same thing. And I also got rid of wxRotationPixel
2224 //      bacause of potential problems in architectures where alignment
2225 //      is an issue, so I had to rewrite parts of the code.
2226
2227 static const double gs_Epsilon = 1e-10;
2228
2229 static inline int wxCint (double x)
2230 {
2231     return (x > 0) ? (int) (x + 0.5) : (int) (x - 0.5);
2232 }
2233
2234
2235 // Auxiliary function to rotate a point (x,y) with respect to point p0
2236 // make it inline and use a straight return to facilitate optimization
2237 // also, the function receives the sine and cosine of the angle to avoid
2238 // repeating the time-consuming calls to these functions -- sin/cos can
2239 // be computed and stored in the calling function.
2240
2241 inline wxRealPoint rotated_point (const wxRealPoint & p, double cos_angle, double sin_angle, const wxRealPoint & p0)
2242 {
2243     return wxRealPoint (p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle,
2244                         p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle);
2245 }
2246
2247 inline wxRealPoint rotated_point (double x, double y, double cos_angle, double sin_angle, const wxRealPoint & p0)
2248 {
2249     return rotated_point (wxRealPoint(x,y), cos_angle, sin_angle, p0);
2250 }
2251
2252 wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool interpolating, wxPoint * offset_after_rotation) const
2253 {
2254     int i;
2255     angle = -angle;     // screen coordinates are a mirror image of "real" coordinates
2256
2257     bool has_alpha = HasAlpha();
2258
2259     // Create pointer-based array to accelerate access to wxImage's data
2260     unsigned char ** data = new unsigned char * [GetHeight()];
2261     data[0] = GetData();
2262     for (i = 1; i < GetHeight(); i++)
2263         data[i] = data[i - 1] + (3 * GetWidth());
2264
2265     // Same for alpha channel
2266     unsigned char ** alpha = NULL;
2267     if (has_alpha)
2268     {
2269         alpha = new unsigned char * [GetHeight()];
2270         alpha[0] = GetAlpha();
2271         for (i = 1; i < GetHeight(); i++)
2272             alpha[i] = alpha[i - 1] + GetWidth();
2273     }
2274
2275     // precompute coefficients for rotation formula
2276     // (sine and cosine of the angle)
2277     const double cos_angle = cos(angle);
2278     const double sin_angle = sin(angle);
2279
2280     // Create new Image to store the result
2281     // First, find rectangle that covers the rotated image;  to do that,
2282     // rotate the four corners
2283
2284     const wxRealPoint p0(centre_of_rotation.x, centre_of_rotation.y);
2285
2286     wxRealPoint p1 = rotated_point (0, 0, cos_angle, sin_angle, p0);
2287     wxRealPoint p2 = rotated_point (0, GetHeight(), cos_angle, sin_angle, p0);
2288     wxRealPoint p3 = rotated_point (GetWidth(), 0, cos_angle, sin_angle, p0);
2289     wxRealPoint p4 = rotated_point (GetWidth(), GetHeight(), cos_angle, sin_angle, p0);
2290
2291     int x1a = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x)));
2292     int y1a = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y)));
2293     int x2a = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x)));
2294     int y2a = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y)));
2295
2296     // Create rotated image
2297     wxImage rotated (x2a - x1a + 1, y2a - y1a + 1, false);
2298     // With alpha channel
2299     if (has_alpha)
2300         rotated.SetAlpha();
2301
2302     if (offset_after_rotation != NULL)
2303     {
2304         *offset_after_rotation = wxPoint (x1a, y1a);
2305     }
2306
2307     // GRG: The rotated (destination) image is always accessed
2308     //      sequentially, so there is no need for a pointer-based
2309     //      array here (and in fact it would be slower).
2310     //
2311     unsigned char * dst = rotated.GetData();
2312
2313     unsigned char * alpha_dst = NULL;
2314     if (has_alpha)
2315         alpha_dst = rotated.GetAlpha();
2316
2317     // GRG: if the original image has a mask, use its RGB values
2318     //      as the blank pixel, else, fall back to default (black).
2319     //
2320     unsigned char blank_r = 0;
2321     unsigned char blank_g = 0;
2322     unsigned char blank_b = 0;
2323
2324     if (HasMask())
2325     {
2326         blank_r = GetMaskRed();
2327         blank_g = GetMaskGreen();
2328         blank_b = GetMaskBlue();
2329         rotated.SetMaskColour( blank_r, blank_g, blank_b );
2330     }
2331
2332     // Now, for each point of the rotated image, find where it came from, by
2333     // performing an inverse rotation (a rotation of -angle) and getting the
2334     // pixel at those coordinates
2335
2336     // GRG: I've taken the (interpolating) test out of the loops, so that
2337     //      it is done only once, instead of repeating it for each pixel.
2338
2339     int x;
2340     if (interpolating)
2341     {
2342         for (int y = 0; y < rotated.GetHeight(); y++)
2343         {
2344             for (x = 0; x < rotated.GetWidth(); x++)
2345             {
2346                 wxRealPoint src = rotated_point (x + x1a, y + y1a, cos_angle, -sin_angle, p0);
2347
2348                 if (-0.25 < src.x && src.x < GetWidth() - 0.75 &&
2349                     -0.25 < src.y && src.y < GetHeight() - 0.75)
2350                 {
2351                     // interpolate using the 4 enclosing grid-points.  Those
2352                     // points can be obtained using floor and ceiling of the
2353                     // exact coordinates of the point
2354                     int x1, y1, x2, y2;
2355
2356                     if (0 < src.x && src.x < GetWidth() - 1)
2357                     {
2358                         x1 = wxCint(floor(src.x));
2359                         x2 = wxCint(ceil(src.x));
2360                     }
2361                     else    // else means that x is near one of the borders (0 or width-1)
2362                     {
2363                         x1 = x2 = wxCint (src.x);
2364                     }
2365
2366                     if (0 < src.y && src.y < GetHeight() - 1)
2367                     {
2368                         y1 = wxCint(floor(src.y));
2369                         y2 = wxCint(ceil(src.y));
2370                     }
2371                     else
2372                     {
2373                         y1 = y2 = wxCint (src.y);
2374                     }
2375
2376                     // get four points and the distances (square of the distance,
2377                     // for efficiency reasons) for the interpolation formula
2378
2379                     // GRG: Do not calculate the points until they are
2380                     //      really needed -- this way we can calculate
2381                     //      just one, instead of four, if d1, d2, d3
2382                     //      or d4 are < gs_Epsilon
2383
2384                     const double d1 = (src.x - x1) * (src.x - x1) + (src.y - y1) * (src.y - y1);
2385                     const double d2 = (src.x - x2) * (src.x - x2) + (src.y - y1) * (src.y - y1);
2386                     const double d3 = (src.x - x2) * (src.x - x2) + (src.y - y2) * (src.y - y2);
2387                     const double d4 = (src.x - x1) * (src.x - x1) + (src.y - y2) * (src.y - y2);
2388
2389                     // Now interpolate as a weighted average of the four surrounding
2390                     // points, where the weights are the distances to each of those points
2391
2392                     // If the point is exactly at one point of the grid of the source
2393                     // image, then don't interpolate -- just assign the pixel
2394
2395                     if (d1 < gs_Epsilon)        // d1,d2,d3,d4 are positive -- no need for abs()
2396                     {
2397                         unsigned char *p = data[y1] + (3 * x1);
2398                         *(dst++) = *(p++);
2399                         *(dst++) = *(p++);
2400                         *(dst++) = *p;
2401
2402                         if (has_alpha)
2403                             *(alpha_dst++) = *(alpha[y1] + x1);
2404                     }
2405                     else if (d2 < gs_Epsilon)
2406                     {
2407                         unsigned char *p = data[y1] + (3 * x2);
2408                         *(dst++) = *(p++);
2409                         *(dst++) = *(p++);
2410                         *(dst++) = *p;
2411
2412                         if (has_alpha)
2413                             *(alpha_dst++) = *(alpha[y1] + x2);
2414                     }
2415                     else if (d3 < gs_Epsilon)
2416                     {
2417                         unsigned char *p = data[y2] + (3 * x2);
2418                         *(dst++) = *(p++);
2419                         *(dst++) = *(p++);
2420                         *(dst++) = *p;
2421
2422                         if (has_alpha)
2423                             *(alpha_dst++) = *(alpha[y2] + x2);
2424                     }
2425                     else if (d4 < gs_Epsilon)
2426                     {
2427                         unsigned char *p = data[y2] + (3 * x1);
2428                         *(dst++) = *(p++);
2429                         *(dst++) = *(p++);
2430                         *(dst++) = *p;
2431
2432                         if (has_alpha)
2433                             *(alpha_dst++) = *(alpha[y2] + x1);
2434                     }
2435                     else
2436                     {
2437                         // weights for the weighted average are proportional to the inverse of the distance
2438                         unsigned char *v1 = data[y1] + (3 * x1);
2439                         unsigned char *v2 = data[y1] + (3 * x2);
2440                         unsigned char *v3 = data[y2] + (3 * x2);
2441                         unsigned char *v4 = data[y2] + (3 * x1);
2442
2443                         const double w1 = 1/d1, w2 = 1/d2, w3 = 1/d3, w4 = 1/d4;
2444
2445                         // GRG: Unrolled.
2446
2447                         *(dst++) = (unsigned char)
2448                             ( (w1 * *(v1++) + w2 * *(v2++) +
2449                                w3 * *(v3++) + w4 * *(v4++)) /
2450                               (w1 + w2 + w3 + w4) );
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
2460                         if (has_alpha)
2461                         {
2462                             v1 = alpha[y1] + (x1);
2463                             v2 = alpha[y1] + (x2);
2464                             v3 = alpha[y2] + (x2);
2465                             v4 = alpha[y2] + (x1);
2466
2467                             *(alpha_dst++) = (unsigned char)
2468                                 ( (w1 * *v1 + w2 * *v2 +
2469                                    w3 * *v3 + w4 * *v4) /
2470                                   (w1 + w2 + w3 + w4) );
2471                         }
2472                     }
2473                 }
2474                 else
2475                 {
2476                     *(dst++) = blank_r;
2477                     *(dst++) = blank_g;
2478                     *(dst++) = blank_b;
2479
2480                     if (has_alpha)
2481                         *(alpha_dst++) = 0;
2482                 }
2483             }
2484         }
2485     }
2486     else    // not interpolating
2487     {
2488         for (int y = 0; y < rotated.GetHeight(); y++)
2489         {
2490             for (x = 0; x < rotated.GetWidth(); x++)
2491             {
2492                 wxRealPoint src = rotated_point (x + x1a, y + y1a, cos_angle, -sin_angle, p0);
2493
2494                 const int xs = wxCint (src.x);      // wxCint rounds to the
2495                 const int ys = wxCint (src.y);      // closest integer
2496
2497                 if (0 <= xs && xs < GetWidth() &&
2498                     0 <= ys && ys < GetHeight())
2499                 {
2500                     unsigned char *p = data[ys] + (3 * xs);
2501                     *(dst++) = *(p++);
2502                     *(dst++) = *(p++);
2503                     *(dst++) = *p;
2504
2505                     if (has_alpha)
2506                         *(alpha_dst++) = *(alpha[ys] + (xs));
2507                 }
2508                 else
2509                 {
2510                     *(dst++) = blank_r;
2511                     *(dst++) = blank_g;
2512                     *(dst++) = blank_b;
2513
2514                     if (has_alpha)
2515                         *(alpha_dst++) = 255;
2516                 }
2517             }
2518         }
2519     }
2520
2521     delete [] data;
2522
2523     if (has_alpha)
2524         delete [] alpha;
2525
2526     return rotated;
2527 }
2528
2529
2530
2531
2532
2533 // A module to allow wxImage initialization/cleanup
2534 // without calling these functions from app.cpp or from
2535 // the user's application.
2536
2537 class wxImageModule: public wxModule
2538 {
2539 DECLARE_DYNAMIC_CLASS(wxImageModule)
2540 public:
2541     wxImageModule() {}
2542     bool OnInit() { wxImage::InitStandardHandlers(); return true; };
2543     void OnExit() { wxImage::CleanUpHandlers(); };
2544 };
2545
2546 IMPLEMENT_DYNAMIC_CLASS(wxImageModule, wxModule)
2547
2548
2549 #endif // wxUSE_IMAGE