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