src/common/image.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        image.cpp
   3 // Purpose:     wxImage
   4 // Author:      Robert Roebling
   5 // RCS-ID:      $Id$
   6 // Copyright:   (c) Robert Roebling
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  11 #pragma implementation "image.h"
  12 #endif
  13
  14 // For compilers that support precompilation, includes "wx.h".
  15 #include "wx/wxprec.h"
  16
  17 #ifdef __BORLANDC__
  18     #pragma hdrstop
  19 #endif
  20
  21 #include "wx/defs.h"
  22
  23 #if wxUSE_IMAGE
  24
  25 #include "wx/image.h"
  26 #include "wx/bitmap.h"
  27 #include "wx/debug.h"
  28 #include "wx/log.h"
  29 #include "wx/app.h"
  30 #include "wx/filefn.h"
  31 #include "wx/wfstream.h"
  32 #include "wx/intl.h"
  33 #include "wx/module.h"
  34 #include "wx/hash.h"
  35 #include "wx/utils.h"
  36 #include "wx/math.h"
  37
  38 #if wxUSE_XPM
  39 #include "wx/xpmdecod.h"
  40 #endif
  41
  42 // For memcpy
  43 #include <string.h>
  44
  45 //-----------------------------------------------------------------------------
  46 // wxImage
  47 //-----------------------------------------------------------------------------
  48
  49 class wxImageRefData: public wxObjectRefData
  50 {
  51 public:
  52     wxImageRefData();
  53     virtual ~wxImageRefData();
  54
  55     int             m_width;
  56     int             m_height;
  57     unsigned char  *m_data;
  58
  59     bool            m_hasMask;
  60     unsigned char   m_maskRed,m_maskGreen,m_maskBlue;
  61
  62     // alpha channel data, may be NULL for the formats without alpha support
  63     unsigned char  *m_alpha;
  64
  65     bool            m_ok;
  66
  67     // if true, m_data is pointer to static data and shouldn't be freed
  68     bool            m_static;
  69
  70     // same as m_static but for m_alpha
  71     bool            m_staticAlpha;
  72
  73 #if wxUSE_PALETTE
  74     wxPalette       m_palette;
  75 #endif // wxUSE_PALETTE
  76
  77     wxArrayString   m_optionNames;
  78     wxArrayString   m_optionValues;
  79
  80     DECLARE_NO_COPY_CLASS(wxImageRefData)
  81 };
  82
  83 wxImageRefData::wxImageRefData()
  84 {
  85     m_width = 0;
  86     m_height = 0;
  87     m_data =
  88     m_alpha = (unsigned char *) NULL;
  89
  90     m_maskRed = 0;
  91     m_maskGreen = 0;
  92     m_maskBlue = 0;
  93     m_hasMask = false;
  94
  95     m_ok = false;
  96     m_static =
  97     m_staticAlpha = false;
  98 }
  99
 100 wxImageRefData::~wxImageRefData()
 101 {
 102     if ( !m_static )
 103         free( m_data );
 104     if ( !m_staticAlpha )
 105         free( m_alpha );
 106 }
 107
 108 wxList wxImage::sm_handlers;
 109
 110 wxImage wxNullImage;
 111
 112 //-----------------------------------------------------------------------------
 113
 114 #define M_IMGDATA ((wxImageRefData *)m_refData)
 115
 116 IMPLEMENT_DYNAMIC_CLASS(wxImage, wxObject)
 117
 118 wxImage::wxImage( int width, int height, bool clear )
 119 {
 120     Create( width, height, clear );
 121 }
 122
 123 wxImage::wxImage( int width, int height, unsigned char* data, bool static_data )
 124 {
 125     Create( width, height, data, static_data );
 126 }
 127
 128 wxImage::wxImage( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data )
 129 {
 130     Create( width, height, data, alpha, static_data );
 131 }
 132
 133 wxImage::wxImage( const wxString& name, long type, int index )
 134 {
 135     LoadFile( name, type, index );
 136 }
 137
 138 wxImage::wxImage( const wxString& name, const wxString& mimetype, int index )
 139 {
 140     LoadFile( name, mimetype, index );
 141 }
 142
 143 #if wxUSE_STREAMS
 144 wxImage::wxImage( wxInputStream& stream, long type, int index )
 145 {
 146     LoadFile( stream, type, index );
 147 }
 148
 149 wxImage::wxImage( wxInputStream& stream, const wxString& mimetype, int index )
 150 {
 151     LoadFile( stream, mimetype, index );
 152 }
 153 #endif // wxUSE_STREAMS
 154
 155 wxImage::wxImage( const wxImage& image )
 156     : wxObject()
 157 {
 158     Ref(image);
 159 }
 160
 161 wxImage::wxImage( const wxImage* image )
 162 {
 163     if (image) Ref(*image);
 164 }
 165
 166 wxImage::wxImage( const char** xpmData )
 167 {
 168     Create(xpmData);
 169 }
 170
 171 wxImage::wxImage( char** xpmData )
 172 {
 173     Create((const char**) xpmData);
 174 }
 175
 176 bool wxImage::Create( const char** xpmData )
 177 {
 178 #if wxUSE_XPM
 179     UnRef();
 180
 181     wxXPMDecoder decoder;
 182     (*this) = decoder.ReadData(xpmData);
 183     return Ok();
 184 #else
 185     return false;
 186 #endif
 187 }
 188
 189 bool wxImage::Create( int width, int height, bool clear )
 190 {
 191     UnRef();
 192
 193     m_refData = new wxImageRefData();
 194
 195     M_IMGDATA->m_data = (unsigned char *) malloc( width*height*3 );
 196     if (!M_IMGDATA->m_data)
 197     {
 198         UnRef();
 199         return false;
 200     }
 201
 202     if (clear)
 203         memset(M_IMGDATA->m_data, 0, width*height*3);
 204
 205     M_IMGDATA->m_width = width;
 206     M_IMGDATA->m_height = height;
 207     M_IMGDATA->m_ok = true;
 208
 209     return true;
 210 }
 211
 212 bool wxImage::Create( int width, int height, unsigned char* data, bool static_data )
 213 {
 214     UnRef();
 215
 216     wxCHECK_MSG( data, false, _T("NULL data in wxImage::Create") );
 217
 218     m_refData = new wxImageRefData();
 219
 220     M_IMGDATA->m_data = data;
 221     M_IMGDATA->m_width = width;
 222     M_IMGDATA->m_height = height;
 223     M_IMGDATA->m_ok = true;
 224     M_IMGDATA->m_static = static_data;
 225
 226     return true;
 227 }
 228
 229 bool wxImage::Create( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data )
 230 {
 231     UnRef();
 232
 233     wxCHECK_MSG( data, false, _T("NULL data in wxImage::Create") );
 234
 235     m_refData = new wxImageRefData();
 236
 237     M_IMGDATA->m_data = data;
 238     M_IMGDATA->m_alpha = alpha;
 239     M_IMGDATA->m_width = width;
 240     M_IMGDATA->m_height = height;
 241     M_IMGDATA->m_ok = true;
 242     M_IMGDATA->m_static = static_data;
 243
 244     return true;
 245 }
 246
 247 void wxImage::Destroy()
 248 {
 249     UnRef();
 250 }
 251
 252 wxImage wxImage::Copy() const
 253 {
 254     wxImage image;
 255
 256     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 257
 258     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 259
 260     unsigned char *data = image.GetData();
 261
 262     wxCHECK_MSG( data, image, wxT("unable to create image") );
 263
 264     image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 265     image.SetMask( M_IMGDATA->m_hasMask );
 266
 267     memcpy( data, GetData(), M_IMGDATA->m_width*M_IMGDATA->m_height*3 );
 268
 269     // also copy the image options
 270     wxImageRefData *imgData = (wxImageRefData *)image.m_refData;
 271     imgData->m_optionNames = M_IMGDATA->m_optionNames;
 272     imgData->m_optionValues = M_IMGDATA->m_optionValues;
 273
 274     return image;
 275 }
 276
 277 wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const
 278 {
 279     if( xFactor == 1 && yFactor == 1 )
 280         return Copy() ;
 281
 282     wxImage image;
 283
 284     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 285
 286     // can't scale to/from 0 size
 287     wxCHECK_MSG( (xFactor > 0) && (yFactor > 0), image,
 288                  wxT("invalid new image size") );
 289
 290     long old_height = M_IMGDATA->m_height,
 291          old_width  = M_IMGDATA->m_width;
 292
 293     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 294                  wxT("invalid old image size") );
 295
 296     long width = old_width / xFactor ;
 297     long height = old_height / yFactor ;
 298
 299     image.Create( width, height, false );
 300
 301     char unsigned *data = image.GetData();
 302
 303     wxCHECK_MSG( data, image, wxT("unable to create image") );
 304
 305     bool hasMask = false ;
 306     unsigned char maskRed = 0;
 307     unsigned char maskGreen = 0;
 308     unsigned char maskBlue =0 ;
 309
 310     unsigned char *source_data = M_IMGDATA->m_data;
 311     unsigned char *target_data = data;
 312     unsigned char *source_alpha = 0 ;
 313     unsigned char *target_alpha = 0 ;
 314     if (M_IMGDATA->m_hasMask)
 315     {
 316         hasMask = true ;
 317         maskRed = M_IMGDATA->m_maskRed;
 318         maskGreen = M_IMGDATA->m_maskGreen;
 319         maskBlue =M_IMGDATA->m_maskBlue ;
 320
 321         image.SetMaskColour( M_IMGDATA->m_maskRed,
 322                              M_IMGDATA->m_maskGreen,
 323                              M_IMGDATA->m_maskBlue );
 324     }
 325     else
 326     {
 327         source_alpha = M_IMGDATA->m_alpha ;
 328         if ( source_alpha )
 329         {
 330             image.SetAlpha() ;
 331             target_alpha = image.GetAlpha() ;
 332         }
 333     }
 334
 335     for (long y = 0; y < height; y++)
 336     {
 337         for (long x = 0; x < width; x++)
 338         {
 339             unsigned long avgRed = 0 ;
 340             unsigned long avgGreen = 0;
 341             unsigned long avgBlue = 0;
 342             unsigned long avgAlpha = 0 ;
 343             unsigned long counter = 0 ;
 344             // determine average
 345             for ( int y1 = 0 ; y1 < yFactor ; ++y1 )
 346             {
 347                 long y_offset = (y * yFactor + y1) * old_width;
 348                 for ( int x1 = 0 ; x1 < xFactor ; ++x1 )
 349                 {
 350                     unsigned char *pixel = source_data + 3 * ( y_offset + x * xFactor + x1 ) ;
 351                     unsigned char red = pixel[0] ;
 352                     unsigned char green = pixel[1] ;
 353                     unsigned char blue = pixel[2] ;
 354                     unsigned char alpha = 255  ;
 355                     if ( source_alpha )
 356                         alpha = *(source_alpha + y_offset + x * xFactor + x1) ;
 357                     if ( !hasMask || red != maskRed || green != maskGreen || blue != maskBlue )
 358                     {
 359                         if ( alpha > 0 )
 360                         {
 361                             avgRed += red ;
 362                             avgGreen += green ;
 363                             avgBlue += blue ;
 364                         }
 365                         avgAlpha += alpha ;
 366                         counter++ ;
 367                     }
 368                 }
 369             }
 370             if ( counter == 0 )
 371             {
 372                 *(target_data++) = M_IMGDATA->m_maskRed ;
 373                 *(target_data++) = M_IMGDATA->m_maskGreen ;
 374                 *(target_data++) = M_IMGDATA->m_maskBlue ;
 375             }
 376             else
 377             {
 378                 if ( source_alpha )
 379                     *(target_alpha++) = (unsigned char)(avgAlpha / counter ) ;
 380                 *(target_data++) = (unsigned char)(avgRed / counter);
 381                 *(target_data++) = (unsigned char)(avgGreen / counter);
 382                 *(target_data++) = (unsigned char)(avgBlue / counter);
 383             }
 384         }
 385     }
 386
 387     // In case this is a cursor, make sure the hotspot is scalled accordingly:
 388     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
 389         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
 390                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X))/xFactor);
 391     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
 392         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
 393                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y))/yFactor);
 394
 395     return image;
 396 }
 397
 398 wxImage wxImage::Scale( int width, int height ) const
 399 {
 400     wxImage image;
 401
 402     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 403
 404     // can't scale to/from 0 size
 405     wxCHECK_MSG( (width > 0) && (height > 0), image,
 406                  wxT("invalid new image size") );
 407
 408     long old_height = M_IMGDATA->m_height,
 409          old_width  = M_IMGDATA->m_width;
 410     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 411                  wxT("invalid old image size") );
 412
 413     if ( old_width % width == 0 && old_width >= width &&
 414         old_height % height == 0 && old_height >= height )
 415     {
 416         return ShrinkBy( old_width / width , old_height / height ) ;
 417     }
 418     image.Create( width, height, false );
 419
 420     unsigned char *data = image.GetData();
 421
 422     wxCHECK_MSG( data, image, wxT("unable to create image") );
 423
 424     unsigned char *source_data = M_IMGDATA->m_data;
 425     unsigned char *target_data = data;
 426     unsigned char *source_alpha = 0 ;
 427     unsigned char *target_alpha = 0 ;
 428
 429     if (M_IMGDATA->m_hasMask)
 430     {
 431         image.SetMaskColour( M_IMGDATA->m_maskRed,
 432                              M_IMGDATA->m_maskGreen,
 433                              M_IMGDATA->m_maskBlue );
 434     }
 435     else
 436     {
 437         source_alpha = M_IMGDATA->m_alpha ;
 438         if ( source_alpha )
 439         {
 440             image.SetAlpha() ;
 441             target_alpha = image.GetAlpha() ;
 442         }
 443     }
 444
 445     long x_delta = (old_width<<16) / width;
 446     long y_delta = (old_height<<16) / height;
 447
 448     unsigned char* dest_pixel = target_data;
 449
 450     long y = 0;
 451     for ( long j = 0; j < height; j++ )
 452         {
 453         unsigned char* src_line = &source_data[(y>>16)*old_width*3];
 454         unsigned char* src_alpha_line = source_alpha ? &source_alpha[(y>>16)*old_width] : 0 ;
 455
 456         long x = 0;
 457         for ( long i = 0; i < width; i++ )
 458         {
 459              unsigned char* src_pixel = &src_line[(x>>16)*3];
 460              unsigned char* src_alpha_pixel = source_alpha ? &src_alpha_line[(x>>16)] : 0 ;
 461              dest_pixel[0] = src_pixel[0];
 462              dest_pixel[1] = src_pixel[1];
 463              dest_pixel[2] = src_pixel[2];
 464              dest_pixel += 3;
 465              if ( source_alpha )
 466                 *(target_alpha++) = *src_alpha_pixel ;
 467              x += x_delta;
 468         }
 469
 470         y += y_delta;
 471     }
 472
 473     // In case this is a cursor, make sure the hotspot is scalled accordingly:
 474     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
 475         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
 476                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X)*width)/old_width);
 477     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
 478         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
 479                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y)*height)/old_height);
 480
 481     return image;
 482 }
 483
 484 wxImage wxImage::Rotate90( bool clockwise ) const
 485 {
 486     wxImage image;
 487
 488     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 489
 490     image.Create( M_IMGDATA->m_height, M_IMGDATA->m_width, false );
 491
 492     unsigned char *data = image.GetData();
 493
 494     wxCHECK_MSG( data, image, wxT("unable to create image") );
 495
 496     unsigned char *source_data = M_IMGDATA->m_data;
 497     unsigned char *target_data;
 498     unsigned char *alpha_data = 0 ;
 499     unsigned char *source_alpha = 0 ;
 500     unsigned char *target_alpha = 0 ;
 501
 502     if (M_IMGDATA->m_hasMask)
 503     {
 504         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 505     }
 506     else
 507     {
 508         source_alpha = M_IMGDATA->m_alpha ;
 509         if ( source_alpha )
 510         {
 511             image.SetAlpha() ;
 512             alpha_data = image.GetAlpha() ;
 513         }
 514     }
 515
 516     long height = M_IMGDATA->m_height;
 517     long width  = M_IMGDATA->m_width;
 518
 519     for (long j = 0; j < height; j++)
 520     {
 521         for (long i = 0; i < width; i++)
 522         {
 523             if (clockwise)
 524             {
 525                 target_data = data + (((i+1)*height) - j - 1)*3;
 526                 if(source_alpha)
 527                     target_alpha = alpha_data + (((i+1)*height) - j - 1);
 528             }
 529             else
 530             {
 531                 target_data = data + ((height*(width-1)) + j - (i*height))*3;
 532                 if(source_alpha)
 533                     target_alpha = alpha_data + ((height*(width-1)) + j - (i*height));
 534             }
 535             memcpy( target_data, source_data, 3 );
 536             source_data += 3;
 537
 538             if(source_alpha)
 539             {
 540                 memcpy( target_alpha, source_alpha, 1 );
 541                 source_alpha += 1;
 542             }
 543         }
 544     }
 545
 546     return image;
 547 }
 548
 549 wxImage wxImage::Mirror( bool horizontally ) const
 550 {
 551     wxImage image;
 552
 553     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 554
 555     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 556
 557     unsigned char *data = image.GetData();
 558
 559     wxCHECK_MSG( data, image, wxT("unable to create image") );
 560
 561     if (M_IMGDATA->m_hasMask)
 562         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 563
 564     long height = M_IMGDATA->m_height;
 565     long width  = M_IMGDATA->m_width;
 566
 567     unsigned char *source_data = M_IMGDATA->m_data;
 568     unsigned char *target_data;
 569
 570     if (horizontally)
 571     {
 572         for (long j = 0; j < height; j++)
 573         {
 574             data += width*3;
 575             target_data = data-3;
 576             for (long i = 0; i < width; i++)
 577             {
 578                 memcpy( target_data, source_data, 3 );
 579                 source_data += 3;
 580                 target_data -= 3;
 581             }
 582         }
 583     }
 584     else
 585     {
 586         for (long i = 0; i < height; i++)
 587         {
 588             target_data = data + 3*width*(height-1-i);
 589             memcpy( target_data, source_data, (size_t)3*width );
 590             source_data += 3*width;
 591         }
 592     }
 593
 594     return image;
 595 }
 596
 597 wxImage wxImage::GetSubImage( const wxRect &rect ) const
 598 {
 599     wxImage image;
 600
 601     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 602
 603     wxCHECK_MSG( (rect.GetLeft()>=0) && (rect.GetTop()>=0) && (rect.GetRight()<=GetWidth()) && (rect.GetBottom()<=GetHeight()),
 604                  image, wxT("invalid subimage size") );
 605
 606     int subwidth=rect.GetWidth();
 607     const int subheight=rect.GetHeight();
 608
 609     image.Create( subwidth, subheight, false );
 610
 611     unsigned char *subdata = image.GetData(), *data=GetData();
 612
 613     wxCHECK_MSG( subdata, image, wxT("unable to create image") );
 614
 615     if (M_IMGDATA->m_hasMask)
 616         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 617
 618     const int subleft=3*rect.GetLeft();
 619     const int width=3*GetWidth();
 620     subwidth*=3;
 621
 622     data+=rect.GetTop()*width+subleft;
 623
 624     for (long j = 0; j < subheight; ++j)
 625     {
 626         memcpy( subdata, data, subwidth);
 627         subdata+=subwidth;
 628         data+=width;
 629     }
 630
 631     return image;
 632 }
 633
 634 wxImage wxImage::Size( const wxSize& size, const wxPoint& pos,
 635                        int r_, int g_, int b_ ) const
 636 {
 637     wxImage image;
 638
 639     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 640     wxCHECK_MSG( (size.GetWidth() > 0) && (size.GetHeight() > 0), image, wxT("invalid size") );
 641
 642     int width = GetWidth(), height = GetHeight();
 643     image.Create(size.GetWidth(), size.GetHeight(), false);
 644
 645     unsigned char r = (unsigned char)r_;
 646     unsigned char g = (unsigned char)g_;
 647     unsigned char b = (unsigned char)b_;
 648     if ((r_ == -1) && (g_ == -1) && (b_ == -1))
 649     {
 650         GetOrFindMaskColour( &r, &g, &b );
 651         image.SetMaskColour(r, g, b);
 652     }
 653
 654     image.SetRGB(wxRect(), r, g, b);
 655
 656     wxRect subRect(pos.x, pos.y, width, height);
 657     wxRect finalRect(0, 0, size.GetWidth(), size.GetHeight());
 658
 659     subRect.Intersect(finalRect);
 660
 661     if (!subRect.IsEmpty())
 662     {
 663         if ((subRect.GetWidth() == width) && (subRect.GetHeight() == height))
 664             image.Paste(*this, pos.x, pos.y);
 665         else
 666             image.Paste(GetSubImage(subRect), pos.x, pos.y);
 667     }
 668
 669     return image;
 670 }
 671
 672 void wxImage::Paste( const wxImage &image, int x, int y )
 673 {
 674     wxCHECK_RET( Ok(), wxT("invalid image") );
 675     wxCHECK_RET( image.Ok(), wxT("invalid image") );
 676
 677     int xx = 0;
 678     int yy = 0;
 679     int width = image.GetWidth();
 680     int height = image.GetHeight();
 681
 682     if (x < 0)
 683     {
 684         xx = -x;
 685         width += x;
 686     }
 687     if (y < 0)
 688     {
 689         yy = -y;
 690         height += y;
 691     }
 692
 693     if ((x+xx)+width > M_IMGDATA->m_width)
 694         width = M_IMGDATA->m_width - (x+xx);
 695     if ((y+yy)+height > M_IMGDATA->m_height)
 696         height = M_IMGDATA->m_height - (y+yy);
 697
 698     if (width < 1) return;
 699     if (height < 1) return;
 700
 701     if ((!HasMask() && !image.HasMask()) ||
 702         (HasMask() && !image.HasMask()) ||
 703        ((HasMask() && image.HasMask() &&
 704          (GetMaskRed()==image.GetMaskRed()) &&
 705          (GetMaskGreen()==image.GetMaskGreen()) &&
 706          (GetMaskBlue()==image.GetMaskBlue()))))
 707     {
 708         width *= 3;
 709         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 710         int source_step = image.GetWidth()*3;
 711
 712         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 713         int target_step = M_IMGDATA->m_width*3;
 714         for (int j = 0; j < height; j++)
 715         {
 716             memcpy( target_data, source_data, width );
 717             source_data += source_step;
 718             target_data += target_step;
 719         }
 720         return;
 721     }
 722
 723     if (!HasMask() && image.HasMask())
 724     {
 725         unsigned char r = image.GetMaskRed();
 726         unsigned char g = image.GetMaskGreen();
 727         unsigned char b = image.GetMaskBlue();
 728
 729         width *= 3;
 730         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 731         int source_step = image.GetWidth()*3;
 732
 733         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 734         int target_step = M_IMGDATA->m_width*3;
 735
 736         for (int j = 0; j < height; j++)
 737         {
 738             for (int i = 0; i < width; i+=3)
 739             {
 740                 if ((source_data[i]   != r) &&
 741                     (source_data[i+1] != g) &&
 742                     (source_data[i+2] != b))
 743                 {
 744                     memcpy( target_data+i, source_data+i, 3 );
 745                 }
 746             }
 747             source_data += source_step;
 748             target_data += target_step;
 749         }
 750     }
 751 }
 752
 753 void wxImage::Replace( unsigned char r1, unsigned char g1, unsigned char b1,
 754                        unsigned char r2, unsigned char g2, unsigned char b2 )
 755 {
 756     wxCHECK_RET( Ok(), wxT("invalid image") );
 757
 758     unsigned char *data = GetData();
 759
 760     const int w = GetWidth();
 761     const int h = GetHeight();
 762
 763     for (int j = 0; j < h; j++)
 764         for (int i = 0; i < w; i++)
 765         {
 766             if ((data[0] == r1) && (data[1] == g1) && (data[2] == b1))
 767             {
 768                 data[0] = r2;
 769                 data[1] = g2;
 770                 data[2] = b2;
 771             }
 772             data += 3;
 773         }
 774 }
 775
 776 wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const
 777 {
 778     wxImage image;
 779
 780     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 781
 782     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 783
 784     unsigned char *data = image.GetData();
 785
 786     wxCHECK_MSG( data, image, wxT("unable to create image") );
 787
 788     if (M_IMGDATA->m_hasMask)
 789     {
 790         if (M_IMGDATA->m_maskRed == r && M_IMGDATA->m_maskGreen == g &&
 791                                          M_IMGDATA->m_maskBlue == b)
 792             image.SetMaskColour( 255, 255, 255 );
 793         else
 794             image.SetMaskColour( 0, 0, 0 );
 795     }
 796
 797     long size = M_IMGDATA->m_height * M_IMGDATA->m_width;
 798
 799     unsigned char *srcd = M_IMGDATA->m_data;
 800     unsigned char *tard = image.GetData();
 801
 802     for ( long i = 0; i < size; i++, srcd += 3, tard += 3 )
 803     {
 804         if (srcd[0] == r && srcd[1] == g && srcd[2] == b)
 805             tard[0] = tard[1] = tard[2] = 255;
 806         else
 807             tard[0] = tard[1] = tard[2] = 0;
 808     }
 809
 810     return image;
 811 }
 812
 813 int wxImage::GetWidth() const
 814 {
 815     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 816
 817     return M_IMGDATA->m_width;
 818 }
 819
 820 int wxImage::GetHeight() const
 821 {
 822     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 823
 824     return M_IMGDATA->m_height;
 825 }
 826
 827 long wxImage::XYToIndex(int x, int y) const
 828 {
 829     if ( Ok() &&
 830             x >= 0 && y >= 0 &&
 831                 x < M_IMGDATA->m_width && y < M_IMGDATA->m_height )
 832     {
 833         return y*M_IMGDATA->m_width + x;
 834     }
 835
 836     return -1;
 837 }
 838
 839 void wxImage::SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b )
 840 {
 841     long pos = XYToIndex(x, y);
 842     wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
 843
 844     pos *= 3;
 845
 846     M_IMGDATA->m_data[ pos   ] = r;
 847     M_IMGDATA->m_data[ pos+1 ] = g;
 848     M_IMGDATA->m_data[ pos+2 ] = b;
 849 }
 850
 851 void wxImage::SetRGB( const wxRect& rect_, unsigned char r, unsigned char g, unsigned char b )
 852 {
 853     wxCHECK_RET( Ok(), wxT("invalid image") );
 854
 855     wxRect rect(rect_);
 856     wxRect imageRect(0, 0, GetWidth(), GetHeight());
 857     if ( rect == wxRect() )
 858     {
 859         rect = imageRect;
 860     }
 861     else
 862     {
 863         wxCHECK_RET( imageRect.Inside(rect.GetTopLeft()) &&
 864                      imageRect.Inside(rect.GetBottomRight()),
 865                      wxT("invalid bounding rectangle") );
 866     }
 867
 868     int x1 = rect.GetLeft(),
 869         y1 = rect.GetTop(),
 870         x2 = rect.GetRight() + 1,
 871         y2 = rect.GetBottom() + 1;
 872
 873     unsigned char *data wxDUMMY_INITIALIZE(NULL);
 874     int x, y, width = GetWidth();
 875     for (y = y1; y < y2; y++)
 876     {
 877         data = M_IMGDATA->m_data + (y*width + x1)*3;
 878         for (x = x1; x < x2; x++)
 879         {
 880             *data++ = r;
 881             *data++ = g;
 882             *data++ = b;
 883         }
 884     }
 885 }
 886
 887 unsigned char wxImage::GetRed( int x, int y ) const
 888 {
 889     long pos = XYToIndex(x, y);
 890     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
 891
 892     pos *= 3;
 893
 894     return M_IMGDATA->m_data[pos];
 895 }
 896
 897 unsigned char wxImage::GetGreen( int x, int y ) const
 898 {
 899     long pos = XYToIndex(x, y);
 900     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
 901
 902     pos *= 3;
 903
 904     return M_IMGDATA->m_data[pos+1];
 905 }
 906
 907 unsigned char wxImage::GetBlue( int x, int y ) const
 908 {
 909     long pos = XYToIndex(x, y);
 910     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
 911
 912     pos *= 3;
 913
 914     return M_IMGDATA->m_data[pos+2];
 915 }
 916
 917 bool wxImage::Ok() const
 918 {
 919     // image of 0 width or height can't be considered ok - at least because it
 920     // causes crashes in ConvertToBitmap() if we don't catch it in time
 921     wxImageRefData *data = M_IMGDATA;
 922     return data && data->m_ok && data->m_width && data->m_height;
 923 }
 924
 925 unsigned char *wxImage::GetData() const
 926 {
 927     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
 928
 929     return M_IMGDATA->m_data;
 930 }
 931
 932 void wxImage::SetData( unsigned char *data, bool static_data  )
 933 {
 934     wxCHECK_RET( Ok(), wxT("invalid image") );
 935
 936     wxImageRefData *newRefData = new wxImageRefData();
 937
 938     newRefData->m_width = M_IMGDATA->m_width;
 939     newRefData->m_height = M_IMGDATA->m_height;
 940     newRefData->m_data = data;
 941     newRefData->m_ok = true;
 942     newRefData->m_maskRed = M_IMGDATA->m_maskRed;
 943     newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
 944     newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
 945     newRefData->m_hasMask = M_IMGDATA->m_hasMask;
 946     newRefData->m_static = static_data;
 947
 948     UnRef();
 949
 950     m_refData = newRefData;
 951 }
 952
 953 void wxImage::SetData( unsigned char *data, int new_width, int new_height, bool static_data )
 954 {
 955     wxImageRefData *newRefData = new wxImageRefData();
 956
 957     if (m_refData)
 958     {
 959         newRefData->m_width = new_width;
 960         newRefData->m_height = new_height;
 961         newRefData->m_data = data;
 962         newRefData->m_ok = true;
 963         newRefData->m_maskRed = M_IMGDATA->m_maskRed;
 964         newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
 965         newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
 966         newRefData->m_hasMask = M_IMGDATA->m_hasMask;
 967     }
 968     else
 969     {
 970         newRefData->m_width = new_width;
 971         newRefData->m_height = new_height;
 972         newRefData->m_data = data;
 973         newRefData->m_ok = true;
 974     }
 975     newRefData->m_static = static_data;
 976
 977     UnRef();
 978
 979     m_refData = newRefData;
 980 }
 981
 982 // ----------------------------------------------------------------------------
 983 // alpha channel support
 984 // ----------------------------------------------------------------------------
 985
 986 void wxImage::SetAlpha(int x, int y, unsigned char alpha)
 987 {
 988     wxCHECK_RET( HasAlpha(), wxT("no alpha channel") );
 989
 990     long pos = XYToIndex(x, y);
 991     wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
 992
 993     M_IMGDATA->m_alpha[pos] = alpha;
 994 }
 995
 996 unsigned char wxImage::GetAlpha(int x, int y) const
 997 {
 998     wxCHECK_MSG( HasAlpha(), 0, wxT("no alpha channel") );
 999
1000     long pos = XYToIndex(x, y);
1001     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
1002
1003     return M_IMGDATA->m_alpha[pos];
1004 }
1005
1006 bool
1007 wxImage::ConvertColourToAlpha(unsigned char r, unsigned char g, unsigned char b)
1008 {
1009     SetAlpha(NULL);
1010
1011     const int w = M_IMGDATA->m_width;
1012     const int h = M_IMGDATA->m_height;
1013
1014     unsigned char *alpha = GetAlpha();
1015     unsigned char *data = GetData();
1016
1017     for ( int y = 0; y < h; y++ )
1018     {
1019         for ( int x = 0; x < w; x++ )
1020         {
1021             *alpha++ = *data;
1022             *data++ = r;
1023             *data++ = g;
1024             *data++ = b;
1025         }
1026     }
1027
1028     return true;
1029 }
1030
1031 void wxImage::SetAlpha( unsigned char *alpha, bool static_data )
1032 {
1033     wxCHECK_RET( Ok(), wxT("invalid image") );
1034
1035     if ( !alpha )
1036     {
1037         alpha = (unsigned char *)malloc(M_IMGDATA->m_width*M_IMGDATA->m_height);
1038     }
1039
1040     free(M_IMGDATA->m_alpha);
1041     M_IMGDATA->m_alpha = alpha;
1042     M_IMGDATA->m_staticAlpha = static_data;
1043 }
1044
1045 unsigned char *wxImage::GetAlpha() const
1046 {
1047     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
1048
1049     return M_IMGDATA->m_alpha;
1050 }
1051
1052 void wxImage::InitAlpha()
1053 {
1054     wxCHECK_RET( !HasAlpha(), wxT("image already has an alpha channel") );
1055
1056     // initialize memory for alpha channel
1057     SetAlpha();
1058
1059     unsigned char *alpha = M_IMGDATA->m_alpha;
1060     const size_t lenAlpha = M_IMGDATA->m_width * M_IMGDATA->m_height;
1061
1062     if ( HasMask() )
1063     {
1064         // use the mask to initialize the alpha channel.
1065         const unsigned char * const alphaEnd = alpha + lenAlpha;
1066
1067         const unsigned char mr = M_IMGDATA->m_maskRed;
1068         const unsigned char mg = M_IMGDATA->m_maskGreen;
1069         const unsigned char mb = M_IMGDATA->m_maskBlue;
1070         for ( unsigned char *src = M_IMGDATA->m_data;
1071               alpha < alphaEnd;
1072               src += 3, alpha++ )
1073         {
1074             *alpha = (src[0] == mr && src[1] == mg && src[2] == mb)
1075                             ? wxIMAGE_ALPHA_TRANSPARENT
1076                             : wxIMAGE_ALPHA_OPAQUE;
1077         }
1078
1079         M_IMGDATA->m_hasMask = false;
1080     }
1081     else // no mask
1082     {
1083         // make the image fully opaque
1084         memset(alpha, wxIMAGE_ALPHA_OPAQUE, lenAlpha);
1085     }
1086 }
1087
1088 // ----------------------------------------------------------------------------
1089 // mask support
1090 // ----------------------------------------------------------------------------
1091
1092 void wxImage::SetMaskColour( unsigned char r, unsigned char g, unsigned char b )
1093 {
1094     wxCHECK_RET( Ok(), wxT("invalid image") );
1095
1096     M_IMGDATA->m_maskRed = r;
1097     M_IMGDATA->m_maskGreen = g;
1098     M_IMGDATA->m_maskBlue = b;
1099     M_IMGDATA->m_hasMask = true;
1100 }
1101
1102 bool wxImage::GetOrFindMaskColour( unsigned char *r, unsigned char *g, unsigned char *b ) const
1103 {
1104     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1105
1106     if (M_IMGDATA->m_hasMask)
1107     {
1108         if (r) *r = M_IMGDATA->m_maskRed;
1109         if (g) *g = M_IMGDATA->m_maskGreen;
1110         if (b) *b = M_IMGDATA->m_maskBlue;
1111         return true;
1112     }
1113     else
1114     {
1115         FindFirstUnusedColour(r, g, b);
1116         return false;
1117     }
1118 }
1119
1120 unsigned char wxImage::GetMaskRed() const
1121 {
1122     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1123
1124     return M_IMGDATA->m_maskRed;
1125 }
1126
1127 unsigned char wxImage::GetMaskGreen() const
1128 {
1129     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1130
1131     return M_IMGDATA->m_maskGreen;
1132 }
1133
1134 unsigned char wxImage::GetMaskBlue() const
1135 {
1136     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1137
1138     return M_IMGDATA->m_maskBlue;
1139 }
1140
1141 void wxImage::SetMask( bool mask )
1142 {
1143     wxCHECK_RET( Ok(), wxT("invalid image") );
1144
1145     M_IMGDATA->m_hasMask = mask;
1146 }
1147
1148 bool wxImage::HasMask() const
1149 {
1150     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1151
1152     return M_IMGDATA->m_hasMask;
1153 }
1154
1155 bool wxImage::IsTransparent(int x, int y, unsigned char threshold) const
1156 {
1157     long pos = XYToIndex(x, y);
1158     wxCHECK_MSG( pos != -1, false, wxT("invalid image coordinates") );
1159
1160     // check mask
1161     if ( M_IMGDATA->m_hasMask )
1162     {
1163         const unsigned char *p = M_IMGDATA->m_data + 3*pos;
1164         if ( p[0] == M_IMGDATA->m_maskRed &&
1165                 p[1] == M_IMGDATA->m_maskGreen &&
1166                     p[2] == M_IMGDATA->m_maskBlue )
1167         {
1168             return true;
1169         }
1170     }
1171
1172     // then check alpha
1173     if ( M_IMGDATA->m_alpha )
1174     {
1175         if ( M_IMGDATA->m_alpha[pos] < threshold )
1176         {
1177             // transparent enough
1178             return true;
1179         }
1180     }
1181
1182     // not transparent
1183     return false;
1184 }
1185
1186 bool wxImage::SetMaskFromImage(const wxImage& mask,
1187                                unsigned char mr, unsigned char mg, unsigned char mb)
1188 {
1189     // check that the images are the same size
1190     if ( (M_IMGDATA->m_height != mask.GetHeight() ) || (M_IMGDATA->m_width != mask.GetWidth () ) )
1191     {
1192         wxLogError( _("Image and mask have different sizes.") );
1193         return false;
1194     }
1195
1196     // find unused colour
1197     unsigned char r,g,b ;
1198     if (!FindFirstUnusedColour(&r, &g, &b))
1199     {
1200         wxLogError( _("No unused colour in image being masked.") );
1201         return false ;
1202     }
1203
1204     unsigned char *imgdata = GetData();
1205     unsigned char *maskdata = mask.GetData();
1206
1207     const int w = GetWidth();
1208     const int h = GetHeight();
1209
1210     for (int j = 0; j < h; j++)
1211     {
1212         for (int i = 0; i < w; i++)
1213         {
1214             if ((maskdata[0] == mr) && (maskdata[1]  == mg) && (maskdata[2] == mb))
1215             {
1216                 imgdata[0] = r;
1217                 imgdata[1] = g;
1218                 imgdata[2] = b;
1219             }
1220             imgdata  += 3;
1221             maskdata += 3;
1222         }
1223     }
1224
1225     SetMaskColour(r, g, b);
1226     SetMask(true);
1227
1228     return true;
1229 }
1230
1231 bool wxImage::ConvertAlphaToMask(unsigned char threshold)
1232 {
1233     if (!HasAlpha())
1234         return true;
1235
1236     unsigned char mr, mg, mb;
1237     if (!FindFirstUnusedColour(&mr, &mg, &mb))
1238     {
1239         wxLogError( _("No unused colour in image being masked.") );
1240         return false;
1241     }
1242
1243     SetMask(true);
1244     SetMaskColour(mr, mg, mb);
1245
1246     unsigned char *imgdata = GetData();
1247     unsigned char *alphadata = GetAlpha();
1248
1249     int w = GetWidth();
1250     int h = GetHeight();
1251
1252     for (int y = 0; y < h; y++)
1253     {
1254         for (int x = 0; x < w; x++, imgdata += 3, alphadata++)
1255         {
1256             if (*alphadata < threshold)
1257             {
1258                 imgdata[0] = mr;
1259                 imgdata[1] = mg;
1260                 imgdata[2] = mb;
1261             }
1262         }
1263     }
1264
1265     free(M_IMGDATA->m_alpha);
1266     M_IMGDATA->m_alpha = NULL;
1267
1268     return true;
1269 }
1270
1271 // ----------------------------------------------------------------------------
1272 // Palette functions
1273 // ----------------------------------------------------------------------------
1274
1275 #if wxUSE_PALETTE
1276
1277 bool wxImage::HasPalette() const
1278 {
1279     if (!Ok())
1280         return false;
1281
1282     return M_IMGDATA->m_palette.Ok();
1283 }
1284
1285 const wxPalette& wxImage::GetPalette() const
1286 {
1287     wxCHECK_MSG( Ok(), wxNullPalette, wxT("invalid image") );
1288
1289     return M_IMGDATA->m_palette;
1290 }
1291
1292 void wxImage::SetPalette(const wxPalette& palette)
1293 {
1294     wxCHECK_RET( Ok(), wxT("invalid image") );
1295
1296     M_IMGDATA->m_palette = palette;
1297 }
1298
1299 #endif // wxUSE_PALETTE
1300
1301 // ----------------------------------------------------------------------------
1302 // Option functions (arbitrary name/value mapping)
1303 // ----------------------------------------------------------------------------
1304
1305 void wxImage::SetOption(const wxString& name, const wxString& value)
1306 {
1307     wxCHECK_RET( Ok(), wxT("invalid image") );
1308
1309     int idx = M_IMGDATA->m_optionNames.Index(name, false);
1310     if (idx == wxNOT_FOUND)
1311     {
1312         M_IMGDATA->m_optionNames.Add(name);
1313         M_IMGDATA->m_optionValues.Add(value);
1314     }
1315     else
1316     {
1317         M_IMGDATA->m_optionNames[idx] = name;
1318         M_IMGDATA->m_optionValues[idx] = value;
1319     }
1320 }
1321
1322 void wxImage::SetOption(const wxString& name, int value)
1323 {
1324     wxString valStr;
1325     valStr.Printf(wxT("%d"), value);
1326     SetOption(name, valStr);
1327 }
1328
1329 wxString wxImage::GetOption(const wxString& name) const
1330 {
1331     wxCHECK_MSG( Ok(), wxEmptyString, wxT("invalid image") );
1332
1333     int idx = M_IMGDATA->m_optionNames.Index(name, false);
1334     if (idx == wxNOT_FOUND)
1335         return wxEmptyString;
1336     else
1337         return M_IMGDATA->m_optionValues[idx];
1338 }
1339
1340 int wxImage::GetOptionInt(const wxString& name) const
1341 {
1342     return wxAtoi(GetOption(name));
1343 }
1344
1345 bool wxImage::HasOption(const wxString& name) const
1346 {
1347     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1348
1349     return (M_IMGDATA->m_optionNames.Index(name, false) != wxNOT_FOUND);
1350 }
1351
1352 // ----------------------------------------------------------------------------
1353 // image I/O
1354 // ----------------------------------------------------------------------------
1355
1356 bool wxImage::LoadFile( const wxString& filename, long type, int index )
1357 {
1358 #if wxUSE_STREAMS
1359     if (wxFileExists(filename))
1360     {
1361         wxFileInputStream stream(filename);
1362         wxBufferedInputStream bstream( stream );
1363         return LoadFile(bstream, type, index);
1364     }
1365     else
1366     {
1367         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
1368
1369         return false;
1370     }
1371 #else // !wxUSE_STREAMS
1372     return false;
1373 #endif // wxUSE_STREAMS
1374 }
1375
1376 bool wxImage::LoadFile( const wxString& filename, const wxString& mimetype, int index )
1377 {
1378 #if wxUSE_STREAMS
1379     if (wxFileExists(filename))
1380     {
1381         wxFileInputStream stream(filename);
1382         wxBufferedInputStream bstream( stream );
1383         return LoadFile(bstream, mimetype, index);
1384     }
1385     else
1386     {
1387         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
1388
1389         return false;
1390     }
1391 #else // !wxUSE_STREAMS
1392     return false;
1393 #endif // wxUSE_STREAMS
1394 }
1395
1396
1397
1398 bool wxImage::SaveFile( const wxString& filename ) const
1399 {
1400     wxString ext = filename.AfterLast('.').Lower();
1401
1402     wxImageHandler * pHandler = FindHandler(ext, -1);
1403     if (pHandler)
1404     {
1405         SaveFile(filename, pHandler->GetType());
1406         return true;
1407     }
1408
1409     wxLogError(_("Can't save image to file '%s': unknown extension."), filename.c_str());
1410
1411     return false;
1412 }
1413
1414 bool wxImage::SaveFile( const wxString& filename, int type ) const
1415 {
1416 #if wxUSE_STREAMS
1417     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1418
1419     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
1420
1421     wxFileOutputStream stream(filename);
1422
1423     if ( stream.IsOk() )
1424     {
1425         wxBufferedOutputStream bstream( stream );
1426         return SaveFile(bstream, type);
1427     }
1428 #endif // wxUSE_STREAMS
1429
1430     return false;
1431 }
1432
1433 bool wxImage::SaveFile( const wxString& filename, const wxString& mimetype ) const
1434 {
1435 #if wxUSE_STREAMS
1436     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1437
1438     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
1439
1440     wxFileOutputStream stream(filename);
1441
1442     if ( stream.IsOk() )
1443     {
1444         wxBufferedOutputStream bstream( stream );
1445         return SaveFile(bstream, mimetype);
1446     }
1447 #endif // wxUSE_STREAMS
1448
1449     return false;
1450 }
1451
1452 bool wxImage::CanRead( const wxString &name )
1453 {
1454 #if wxUSE_STREAMS
1455   wxFileInputStream stream(name);
1456   return CanRead(stream);
1457 #else
1458   return false;
1459 #endif
1460 }
1461
1462 int wxImage::GetImageCount( const wxString &name, long type )
1463 {
1464 #if wxUSE_STREAMS
1465   wxFileInputStream stream(name);
1466   if (stream.Ok())
1467       return GetImageCount(stream, type);
1468 #endif
1469
1470   return 0;
1471 }
1472
1473 #if wxUSE_STREAMS
1474
1475 bool wxImage::CanRead( wxInputStream &stream )
1476 {
1477     const wxList& list = GetHandlers();
1478
1479     for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
1480     {
1481         wxImageHandler *handler=(wxImageHandler*)node->GetData();
1482         if (handler->CanRead( stream ))
1483             return true;
1484     }
1485
1486     return false;
1487 }
1488
1489 int wxImage::GetImageCount( wxInputStream &stream, long type )
1490 {
1491     wxImageHandler *handler;
1492
1493     if ( type == wxBITMAP_TYPE_ANY )
1494     {
1495         wxList &list=GetHandlers();
1496
1497         for (wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext())
1498         {
1499              handler=(wxImageHandler*)node->GetData();
1500              if ( handler->CanRead(stream) )
1501                  return handler->GetImageCount(stream);
1502
1503         }
1504
1505         wxLogWarning(_("No handler found for image type."));
1506         return 0;
1507     }
1508
1509     handler = FindHandler(type);
1510
1511     if ( !handler )
1512     {
1513         wxLogWarning(_("No image handler for type %d defined."), type);
1514         return false;
1515     }
1516
1517     if ( handler->CanRead(stream) )
1518     {
1519         return handler->GetImageCount(stream);
1520     }
1521     else
1522     {
1523         wxLogError(_("Image file is not of type %d."), type);
1524         return 0;
1525     }
1526 }
1527
1528 bool wxImage::LoadFile( wxInputStream& stream, long type, int index )
1529 {
1530     UnRef();
1531
1532     m_refData = new wxImageRefData;
1533
1534     wxImageHandler *handler;
1535
1536     if ( type == wxBITMAP_TYPE_ANY )
1537     {
1538         wxList &list=GetHandlers();
1539
1540         for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
1541         {
1542              handler=(wxImageHandler*)node->GetData();
1543              if ( handler->CanRead(stream) )
1544                  return handler->LoadFile(this, stream, true/*verbose*/, index);
1545
1546         }
1547
1548         wxLogWarning( _("No handler found for image type.") );
1549         return false;
1550     }
1551
1552     handler = FindHandler(type);
1553
1554     if (handler == 0)
1555     {
1556         wxLogWarning( _("No image handler for type %d defined."), type );
1557
1558         return false;
1559     }
1560
1561     return handler->LoadFile(this, stream, true/*verbose*/, index);
1562 }
1563
1564 bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int index )
1565 {
1566     UnRef();
1567
1568     m_refData = new wxImageRefData;
1569
1570     wxImageHandler *handler = FindHandlerMime(mimetype);
1571
1572     if (handler == 0)
1573     {
1574         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1575
1576         return false;
1577     }
1578
1579     return handler->LoadFile( this, stream, true/*verbose*/, index );
1580 }
1581
1582 bool wxImage::SaveFile( wxOutputStream& stream, int type ) const
1583 {
1584     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1585
1586     wxImageHandler *handler = FindHandler(type);
1587     if ( !handler )
1588     {
1589         wxLogWarning( _("No image handler for type %d defined."), type );
1590
1591         return false;
1592     }
1593
1594     return handler->SaveFile( (wxImage*)this, stream );
1595 }
1596
1597 bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype ) const
1598 {
1599     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1600
1601     wxImageHandler *handler = FindHandlerMime(mimetype);
1602     if ( !handler )
1603     {
1604         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1605
1606         return false;
1607     }
1608
1609     return handler->SaveFile( (wxImage*)this, stream );
1610 }
1611 #endif // wxUSE_STREAMS
1612
1613 // ----------------------------------------------------------------------------
1614 // image I/O handlers
1615 // ----------------------------------------------------------------------------
1616
1617 void wxImage::AddHandler( wxImageHandler *handler )
1618 {
1619     // Check for an existing handler of the type being added.
1620     if (FindHandler( handler->GetType() ) == 0)
1621     {
1622         sm_handlers.Append( handler );
1623     }
1624     else
1625     {
1626         // This is not documented behaviour, merely the simplest 'fix'
1627         // for preventing duplicate additions.  If someone ever has
1628         // a good reason to add and remove duplicate handlers (and they
1629         // may) we should probably refcount the duplicates.
1630         //   also an issue in InsertHandler below.
1631
1632         wxLogDebug( _T("Adding duplicate image handler for '%s'"),
1633                     handler->GetName().c_str() );
1634         delete handler;
1635     }
1636 }
1637
1638 void wxImage::InsertHandler( wxImageHandler *handler )
1639 {
1640     // Check for an existing handler of the type being added.
1641     if (FindHandler( handler->GetType() ) == 0)
1642     {
1643         sm_handlers.Insert( handler );
1644     }
1645     else
1646     {
1647         // see AddHandler for additional comments.
1648         wxLogDebug( _T("Inserting duplicate image handler for '%s'"),
1649                     handler->GetName().c_str() );
1650         delete handler;
1651     }
1652 }
1653
1654 bool wxImage::RemoveHandler( const wxString& name )
1655 {
1656     wxImageHandler *handler = FindHandler(name);
1657     if (handler)
1658     {
1659         sm_handlers.DeleteObject(handler);
1660         delete handler;
1661         return true;
1662     }
1663     else
1664         return false;
1665 }
1666
1667 wxImageHandler *wxImage::FindHandler( const wxString& name )
1668 {
1669     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1670     while (node)
1671     {
1672         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1673         if (handler->GetName().Cmp(name) == 0) return handler;
1674
1675         node = node->GetNext();
1676     }
1677     return 0;
1678 }
1679
1680 wxImageHandler *wxImage::FindHandler( const wxString& extension, long bitmapType )
1681 {
1682     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1683     while (node)
1684     {
1685         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1686         if ( (handler->GetExtension().Cmp(extension) == 0) &&
1687             (bitmapType == -1 || handler->GetType() == bitmapType) )
1688             return handler;
1689         node = node->GetNext();
1690     }
1691     return 0;
1692 }
1693
1694 wxImageHandler *wxImage::FindHandler( long bitmapType )
1695 {
1696     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1697     while (node)
1698     {
1699         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1700         if (handler->GetType() == bitmapType) return handler;
1701         node = node->GetNext();
1702     }
1703     return 0;
1704 }
1705
1706 wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype )
1707 {
1708     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1709     while (node)
1710     {
1711         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1712         if (handler->GetMimeType().IsSameAs(mimetype, false)) return handler;
1713         node = node->GetNext();
1714     }
1715     return 0;
1716 }
1717
1718 void wxImage::InitStandardHandlers()
1719 {
1720 #if wxUSE_STREAMS
1721     AddHandler(new wxBMPHandler);
1722 #endif // wxUSE_STREAMS
1723 }
1724
1725 void wxImage::CleanUpHandlers()
1726 {
1727     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1728     while (node)
1729     {
1730         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1731         wxList::compatibility_iterator next = node->GetNext();
1732         delete handler;
1733         node = next;
1734     }
1735
1736     sm_handlers.Clear();
1737 }
1738
1739 wxString wxImage::GetImageExtWildcard()
1740 {
1741     wxString fmts;
1742
1743     wxList& Handlers = wxImage::GetHandlers();
1744     wxList::compatibility_iterator Node = Handlers.GetFirst();
1745     while ( Node )
1746     {
1747         wxImageHandler* Handler = (wxImageHandler*)Node->GetData();
1748         fmts += wxT("*.") + Handler->GetExtension();
1749         Node = Node->GetNext();
1750         if ( Node ) fmts += wxT(";");
1751     }
1752
1753     return wxT("(") + fmts + wxT(")|") + fmts;
1754 }
1755
1756 wxImage::HSVValue wxImage::RGBtoHSV(const RGBValue& rgb)
1757 {
1758     double hue, saturation, value;
1759
1760     const double red = rgb.red / 255.0,
1761                  green = rgb.green / 255.0,
1762                  blue = rgb.blue / 255.0;
1763
1764     double minimumRGB = red;
1765     if (green < minimumRGB)
1766         minimumRGB = green;
1767
1768     if (blue < minimumRGB)
1769         minimumRGB = blue;
1770
1771     double maximumRGB = red;
1772     if (green > maximumRGB)
1773         maximumRGB = green;
1774
1775     if (blue > maximumRGB)
1776         maximumRGB = blue;
1777
1778     value = maximumRGB;
1779
1780     if (maximumRGB == minimumRGB)
1781     {
1782         // Gray has no color
1783         hue = 0.0;
1784         saturation = 0.0;
1785     }
1786     else
1787     {
1788         double deltaRGB = maximumRGB - minimumRGB;
1789
1790         saturation = deltaRGB / maximumRGB;
1791
1792         if ( red == maximumRGB )
1793             hue = (green - blue) / deltaRGB;
1794         else if (green == maximumRGB)
1795             hue = 2.0 + (blue - red) / deltaRGB;
1796         else
1797             hue = 4.0 + (red - green) / deltaRGB;
1798
1799         hue = hue / 6.0;
1800
1801         if (hue < 0.0)
1802             hue = hue + 1.0;
1803     }
1804
1805     return HSVValue(hue, saturation, value);
1806 }
1807
1808 wxImage::RGBValue wxImage::HSVtoRGB(const HSVValue& hsv)
1809 {
1810     double red, green, blue;
1811
1812     if ( hsv.saturation == 0.0 )
1813     {
1814         red = hsv.value; //Grey
1815         green = hsv.value;
1816         blue = hsv.value;
1817     }
1818     else
1819     {
1820         double hue = hsv.hue * 6.0;      // sector 0 to 5
1821         int i = (int)floor(hue);
1822         double f = hue - i;          // fractional part of h
1823         double p = hsv.value * (1.0 - hsv.saturation);
1824
1825         switch (i)
1826         {
1827             case 0:
1828                 red = hsv.value;
1829                 green = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
1830                 blue = p;
1831                 break;
1832
1833             case 1:
1834                 red = hsv.value * (1.0 - hsv.saturation * f);
1835                 green = hsv.value;
1836                 blue = p;
1837                 break;
1838
1839             case 2:
1840                 red = p;
1841                 green = hsv.value;
1842                 blue = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
1843                 break;
1844
1845             case 3:
1846                 red = p;
1847                 green = hsv.value * (1.0 - hsv.saturation * f);
1848                 blue = hsv.value;
1849                 break;
1850
1851             case 4:
1852                 red = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
1853                 green = p;
1854                 blue = hsv.value;
1855                 break;
1856
1857             default:    // case 5:
1858                 red = hsv.value;
1859                 green = p;
1860                 blue = hsv.value * (1.0 - hsv.saturation * f);
1861                 break;
1862         }
1863     }
1864
1865     return RGBValue((unsigned char)(red * 255.0),
1866                     (unsigned char)(green * 255.0),
1867                     (unsigned char)(blue * 255.0));
1868 }
1869
1870 /*
1871  * Rotates the hue of each pixel of the image. angle is a double in the range
1872  * -1.0..1.0 where -1.0 is -360 degrees and 1.0 is 360 degrees
1873  */
1874 void wxImage::RotateHue(double angle)
1875 {
1876     unsigned char *srcBytePtr;
1877     unsigned char *dstBytePtr;
1878     unsigned long count;
1879     wxImage::HSVValue hsv;
1880     wxImage::RGBValue rgb;
1881
1882     wxASSERT (angle >= -1.0 && angle <= 1.0);
1883     count = M_IMGDATA->m_width * M_IMGDATA->m_height;
1884     if (count > 0 && angle != 0.0)
1885     {
1886         srcBytePtr = M_IMGDATA->m_data;
1887         dstBytePtr = srcBytePtr;
1888         do
1889         {
1890             rgb.red = *srcBytePtr++;
1891             rgb.green = *srcBytePtr++;
1892             rgb.blue = *srcBytePtr++;
1893             hsv = RGBtoHSV(rgb);
1894
1895             hsv.hue = hsv.hue + angle;
1896             if (hsv.hue > 1.0)
1897                 hsv.hue = hsv.hue - 1.0;
1898             else if (hsv.hue < 0.0)
1899                 hsv.hue = hsv.hue + 1.0;
1900
1901             rgb = HSVtoRGB(hsv);
1902             *dstBytePtr++ = rgb.red;
1903             *dstBytePtr++ = rgb.green;
1904             *dstBytePtr++ = rgb.blue;
1905         } while (--count != 0);
1906     }
1907 }
1908
1909 //-----------------------------------------------------------------------------
1910 // wxImageHandler
1911 //-----------------------------------------------------------------------------
1912
1913 IMPLEMENT_ABSTRACT_CLASS(wxImageHandler,wxObject)
1914
1915 #if wxUSE_STREAMS
1916 bool wxImageHandler::LoadFile( wxImage *WXUNUSED(image), wxInputStream& WXUNUSED(stream), bool WXUNUSED(verbose), int WXUNUSED(index) )
1917 {
1918     return false;
1919 }
1920
1921 bool wxImageHandler::SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream), bool WXUNUSED(verbose) )
1922 {
1923     return false;
1924 }
1925
1926 int wxImageHandler::GetImageCount( wxInputStream& WXUNUSED(stream) )
1927 {
1928     return 1;
1929 }
1930
1931 bool wxImageHandler::CanRead( const wxString& name )
1932 {
1933     if (wxFileExists(name))
1934     {
1935         wxFileInputStream stream(name);
1936         return CanRead(stream);
1937     }
1938
1939     wxLogError( _("Can't check image format of file '%s': file does not exist."), name.c_str() );
1940
1941     return false;
1942 }
1943
1944 bool wxImageHandler::CallDoCanRead(wxInputStream& stream)
1945 {
1946     wxFileOffset posOld = stream.TellI();
1947     if ( posOld == wxInvalidOffset )
1948     {
1949         // can't test unseekable stream
1950         return false;
1951     }
1952
1953     bool ok = DoCanRead(stream);
1954
1955     // restore the old position to be able to test other formats and so on
1956     if ( stream.SeekI(posOld) == wxInvalidOffset )
1957     {
1958         wxLogDebug(_T("Failed to rewind the stream in wxImageHandler!"));
1959
1960         // reading would fail anyhow as we're not at the right position
1961         return false;
1962     }
1963
1964     return ok;
1965 }
1966
1967 #endif // wxUSE_STREAMS
1968
1969 // ----------------------------------------------------------------------------
1970 // image histogram stuff
1971 // ----------------------------------------------------------------------------
1972
1973 bool
1974 wxImageHistogram::FindFirstUnusedColour(unsigned char *r,
1975                                         unsigned char *g,
1976                                         unsigned char *b,
1977                                         unsigned char r2,
1978                                         unsigned char b2,
1979                                         unsigned char g2) const
1980 {
1981     unsigned long key = MakeKey(r2, g2, b2);
1982
1983     while ( find(key) != end() )
1984     {
1985         // color already used
1986         r2++;
1987         if ( r2 >= 255 )
1988         {
1989             r2 = 0;
1990             g2++;
1991             if ( g2 >= 255 )
1992             {
1993                 g2 = 0;
1994                 b2++;
1995                 if ( b2 >= 255 )
1996                 {
1997                     wxLogError(_("No unused colour in image.") );
1998                     return false;
1999                 }
2000             }
2001         }
2002
2003         key = MakeKey(r2, g2, b2);
2004     }
2005
2006     if ( r )
2007         *r = r2;
2008     if ( g )
2009         *g = g2;
2010     if ( b )
2011         *b = b2;
2012
2013     return true;
2014 }
2015
2016 bool
2017 wxImage::FindFirstUnusedColour(unsigned char *r,
2018                                unsigned char *g,
2019                                unsigned char *b,
2020                                unsigned char r2,
2021                                unsigned char b2,
2022                                unsigned char g2) const
2023 {
2024     wxImageHistogram histogram;
2025
2026     ComputeHistogram(histogram);
2027
2028     return histogram.FindFirstUnusedColour(r, g, b, r2, g2, b2);
2029 }
2030
2031
2032
2033 // GRG, Dic/99
2034 // Counts and returns the number of different colours. Optionally stops
2035 // when it exceeds 'stopafter' different colours. This is useful, for
2036 // example, to see if the image can be saved as 8-bit (256 colour or
2037 // less, in this case it would be invoked as CountColours(256)). Default
2038 // value for stopafter is -1 (don't care).
2039 //
2040 unsigned long wxImage::CountColours( unsigned long stopafter ) const
2041 {
2042     wxHashTable h;
2043     wxObject dummy;
2044     unsigned char r, g, b;
2045     unsigned char *p;
2046     unsigned long size, nentries, key;
2047
2048     p = GetData();
2049     size = GetWidth() * GetHeight();
2050     nentries = 0;
2051
2052     for (unsigned long j = 0; (j < size) && (nentries <= stopafter) ; j++)
2053     {
2054         r = *(p++);
2055         g = *(p++);
2056         b = *(p++);
2057         key = wxImageHistogram::MakeKey(r, g, b);
2058
2059         if (h.Get(key) == NULL)
2060         {
2061             h.Put(key, &dummy);
2062             nentries++;
2063         }
2064     }
2065
2066     return nentries;
2067 }
2068
2069
2070 unsigned long wxImage::ComputeHistogram( wxImageHistogram &h ) const
2071 {
2072     unsigned char *p = GetData();
2073     unsigned long nentries = 0;
2074
2075     h.clear();
2076
2077     const unsigned long size = GetWidth() * GetHeight();
2078
2079     unsigned char r, g, b;
2080     for ( unsigned long n = 0; n < size; n++ )
2081     {
2082         r = *p++;
2083         g = *p++;
2084         b = *p++;
2085
2086         wxImageHistogramEntry& entry = h[wxImageHistogram::MakeKey(r, g, b)];
2087
2088         if ( entry.value++ == 0 )
2089             entry.index = nentries++;
2090     }
2091
2092     return nentries;
2093 }
2094
2095 /*
2096  * Rotation code by Carlos Moreno
2097  */
2098
2099 // GRG: I've removed wxRotationPoint - we already have wxRealPoint which
2100 //      does exactly the same thing. And I also got rid of wxRotationPixel
2101 //      bacause of potential problems in architectures where alignment
2102 //      is an issue, so I had to rewrite parts of the code.
2103
2104 static const double gs_Epsilon = 1e-10;
2105
2106 static inline int wxCint (double x)
2107 {
2108     return (x > 0) ? (int) (x + 0.5) : (int) (x - 0.5);
2109 }
2110
2111
2112 // Auxiliary function to rotate a point (x,y) with respect to point p0
2113 // make it inline and use a straight return to facilitate optimization
2114 // also, the function receives the sine and cosine of the angle to avoid
2115 // repeating the time-consuming calls to these functions -- sin/cos can
2116 // be computed and stored in the calling function.
2117
2118 inline wxRealPoint rotated_point (const wxRealPoint & p, double cos_angle, double sin_angle, const wxRealPoint & p0)
2119 {
2120     return wxRealPoint (p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle,
2121                         p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle);
2122 }
2123
2124 inline wxRealPoint rotated_point (double x, double y, double cos_angle, double sin_angle, const wxRealPoint & p0)
2125 {
2126     return rotated_point (wxRealPoint(x,y), cos_angle, sin_angle, p0);
2127 }
2128
2129 wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool interpolating, wxPoint * offset_after_rotation) const
2130 {
2131     int i;
2132     angle = -angle;     // screen coordinates are a mirror image of "real" coordinates
2133
2134     bool has_alpha = HasAlpha();
2135
2136     // Create pointer-based array to accelerate access to wxImage's data
2137     unsigned char ** data = new unsigned char * [GetHeight()];
2138     data[0] = GetData();
2139     for (i = 1; i < GetHeight(); i++)
2140         data[i] = data[i - 1] + (3 * GetWidth());
2141
2142     // Same for alpha channel
2143     unsigned char ** alpha = NULL;
2144     if (has_alpha)
2145     {
2146         alpha = new unsigned char * [GetHeight()];
2147         alpha[0] = GetAlpha();
2148         for (i = 1; i < GetHeight(); i++)
2149             alpha[i] = alpha[i - 1] + GetWidth();
2150     }
2151
2152     // precompute coefficients for rotation formula
2153     // (sine and cosine of the angle)
2154     const double cos_angle = cos(angle);
2155     const double sin_angle = sin(angle);
2156
2157     // Create new Image to store the result
2158     // First, find rectangle that covers the rotated image;  to do that,
2159     // rotate the four corners
2160
2161     const wxRealPoint p0(centre_of_rotation.x, centre_of_rotation.y);
2162
2163     wxRealPoint p1 = rotated_point (0, 0, cos_angle, sin_angle, p0);
2164     wxRealPoint p2 = rotated_point (0, GetHeight(), cos_angle, sin_angle, p0);
2165     wxRealPoint p3 = rotated_point (GetWidth(), 0, cos_angle, sin_angle, p0);
2166     wxRealPoint p4 = rotated_point (GetWidth(), GetHeight(), cos_angle, sin_angle, p0);
2167
2168     int x1 = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x)));
2169     int y1 = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y)));
2170     int x2 = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x)));
2171     int y2 = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y)));
2172
2173     // Create rotated image
2174     wxImage rotated (x2 - x1 + 1, y2 - y1 + 1, false);
2175     // With alpha channel
2176     if (has_alpha)
2177         rotated.SetAlpha();
2178
2179     if (offset_after_rotation != NULL)
2180     {
2181         *offset_after_rotation = wxPoint (x1, y1);
2182     }
2183
2184     // GRG: The rotated (destination) image is always accessed
2185     //      sequentially, so there is no need for a pointer-based
2186     //      array here (and in fact it would be slower).
2187     //
2188     unsigned char * dst = rotated.GetData();
2189
2190     unsigned char * alpha_dst = NULL;
2191     if (has_alpha)
2192         alpha_dst = rotated.GetAlpha();
2193
2194     // GRG: if the original image has a mask, use its RGB values
2195     //      as the blank pixel, else, fall back to default (black).
2196     //
2197     unsigned char blank_r = 0;
2198     unsigned char blank_g = 0;
2199     unsigned char blank_b = 0;
2200
2201     if (HasMask())
2202     {
2203         blank_r = GetMaskRed();
2204         blank_g = GetMaskGreen();
2205         blank_b = GetMaskBlue();
2206         rotated.SetMaskColour( blank_r, blank_g, blank_b );
2207     }
2208
2209     // Now, for each point of the rotated image, find where it came from, by
2210     // performing an inverse rotation (a rotation of -angle) and getting the
2211     // pixel at those coordinates
2212
2213     // GRG: I've taken the (interpolating) test out of the loops, so that
2214     //      it is done only once, instead of repeating it for each pixel.
2215
2216     int x;
2217     if (interpolating)
2218     {
2219         for (int y = 0; y < rotated.GetHeight(); y++)
2220         {
2221             for (x = 0; x < rotated.GetWidth(); x++)
2222             {
2223                 wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
2224
2225                 if (-0.25 < src.x && src.x < GetWidth() - 0.75 &&
2226                     -0.25 < src.y && src.y < GetHeight() - 0.75)
2227                 {
2228                     // interpolate using the 4 enclosing grid-points.  Those
2229                     // points can be obtained using floor and ceiling of the
2230                     // exact coordinates of the point
2231                         // C.M. 2000-02-17:  when the point is near the border, special care is required.
2232
2233                     int x1, y1, x2, y2;
2234
2235                     if (0 < src.x && src.x < GetWidth() - 1)
2236                     {
2237                         x1 = wxCint(floor(src.x));
2238                         x2 = wxCint(ceil(src.x));
2239                     }
2240                     else    // else means that x is near one of the borders (0 or width-1)
2241                     {
2242                         x1 = x2 = wxCint (src.x);
2243                     }
2244
2245                     if (0 < src.y && src.y < GetHeight() - 1)
2246                     {
2247                         y1 = wxCint(floor(src.y));
2248                         y2 = wxCint(ceil(src.y));
2249                     }
2250                     else
2251                     {
2252                         y1 = y2 = wxCint (src.y);
2253                     }
2254
2255                     // get four points and the distances (square of the distance,
2256                     // for efficiency reasons) for the interpolation formula
2257
2258                     // GRG: Do not calculate the points until they are
2259                     //      really needed -- this way we can calculate
2260                     //      just one, instead of four, if d1, d2, d3
2261                     //      or d4 are < gs_Epsilon
2262
2263                     const double d1 = (src.x - x1) * (src.x - x1) + (src.y - y1) * (src.y - y1);
2264                     const double d2 = (src.x - x2) * (src.x - x2) + (src.y - y1) * (src.y - y1);
2265                     const double d3 = (src.x - x2) * (src.x - x2) + (src.y - y2) * (src.y - y2);
2266                     const double d4 = (src.x - x1) * (src.x - x1) + (src.y - y2) * (src.y - y2);
2267
2268                     // Now interpolate as a weighted average of the four surrounding
2269                     // points, where the weights are the distances to each of those points
2270
2271                     // If the point is exactly at one point of the grid of the source
2272                     // image, then don't interpolate -- just assign the pixel
2273
2274                     if (d1 < gs_Epsilon)        // d1,d2,d3,d4 are positive -- no need for abs()
2275                     {
2276                         unsigned char *p = data[y1] + (3 * x1);
2277                         *(dst++) = *(p++);
2278                         *(dst++) = *(p++);
2279                         *(dst++) = *p;
2280
2281                         if (has_alpha)
2282                         {
2283                             unsigned char *p = alpha[y1] + x1;
2284                             *(alpha_dst++) = *p;
2285                         }
2286                     }
2287                     else if (d2 < gs_Epsilon)
2288                     {
2289                         unsigned char *p = data[y1] + (3 * x2);
2290                         *(dst++) = *(p++);
2291                         *(dst++) = *(p++);
2292                         *(dst++) = *p;
2293
2294                         if (has_alpha)
2295                         {
2296                             unsigned char *p = alpha[y1] + x2;
2297                             *(alpha_dst++) = *p;
2298                         }
2299                     }
2300                     else if (d3 < gs_Epsilon)
2301                     {
2302                         unsigned char *p = data[y2] + (3 * x2);
2303                         *(dst++) = *(p++);
2304                         *(dst++) = *(p++);
2305                         *(dst++) = *p;
2306
2307                         if (has_alpha)
2308                         {
2309                             unsigned char *p = alpha[y2] + x2;
2310                             *(alpha_dst++) = *p;
2311                         }
2312                     }
2313                     else if (d4 < gs_Epsilon)
2314                     {
2315                         unsigned char *p = data[y2] + (3 * x1);
2316                         *(dst++) = *(p++);
2317                         *(dst++) = *(p++);
2318                         *(dst++) = *p;
2319
2320                         if (has_alpha)
2321                         {
2322                             unsigned char *p = alpha[y2] + x1;
2323                             *(alpha_dst++) = *p;
2324                         }
2325                     }
2326                     else
2327                     {
2328                         // weights for the weighted average are proportional to the inverse of the distance
2329                         unsigned char *v1 = data[y1] + (3 * x1);
2330                         unsigned char *v2 = data[y1] + (3 * x2);
2331                         unsigned char *v3 = data[y2] + (3 * x2);
2332                         unsigned char *v4 = data[y2] + (3 * x1);
2333
2334                         const double w1 = 1/d1, w2 = 1/d2, w3 = 1/d3, w4 = 1/d4;
2335
2336                         // GRG: Unrolled.
2337
2338                         *(dst++) = (unsigned char)
2339                             ( (w1 * *(v1++) + w2 * *(v2++) +
2340                                w3 * *(v3++) + w4 * *(v4++)) /
2341                               (w1 + w2 + w3 + w4) );
2342                         *(dst++) = (unsigned char)
2343                             ( (w1 * *(v1++) + w2 * *(v2++) +
2344                                w3 * *(v3++) + w4 * *(v4++)) /
2345                               (w1 + w2 + w3 + w4) );
2346                         *(dst++) = (unsigned char)
2347                             ( (w1 * *v1 + w2 * *v2 +
2348                                w3 * *v3 + w4 * *v4) /
2349                               (w1 + w2 + w3 + w4) );
2350
2351                         if (has_alpha)
2352                         {
2353                             unsigned char *v1 = alpha[y1] + (x1);
2354                             unsigned char *v2 = alpha[y1] + (x2);
2355                             unsigned char *v3 = alpha[y2] + (x2);
2356                             unsigned char *v4 = alpha[y2] + (x1);
2357
2358                             *(alpha_dst++) = (unsigned char)
2359                                 ( (w1 * *v1 + w2 * *v2 +
2360                                    w3 * *v3 + w4 * *v4) /
2361                                   (w1 + w2 + w3 + w4) );
2362                         }
2363                     }
2364                 }
2365                 else
2366                 {
2367                     *(dst++) = blank_r;
2368                     *(dst++) = blank_g;
2369                     *(dst++) = blank_b;
2370
2371                     if (has_alpha)
2372                         *(alpha_dst++) = 0;
2373                 }
2374             }
2375         }
2376     }
2377     else    // not interpolating
2378     {
2379         for (int y = 0; y < rotated.GetHeight(); y++)
2380         {
2381             for (x = 0; x < rotated.GetWidth(); x++)
2382             {
2383                 wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
2384
2385                 const int xs = wxCint (src.x);      // wxCint rounds to the
2386                 const int ys = wxCint (src.y);      // closest integer
2387
2388                 if (0 <= xs && xs < GetWidth() &&
2389                     0 <= ys && ys < GetHeight())
2390                 {
2391                     unsigned char *p = data[ys] + (3 * xs);
2392                     *(dst++) = *(p++);
2393                     *(dst++) = *(p++);
2394                     *(dst++) = *p;
2395
2396                     if (has_alpha)
2397                     {
2398                         unsigned char *p = alpha[ys] + (xs);
2399                         *(alpha_dst++) = *p;
2400                     }
2401                 }
2402                 else
2403                 {
2404                     *(dst++) = blank_r;
2405                     *(dst++) = blank_g;
2406                     *(dst++) = blank_b;
2407
2408                     if (has_alpha)
2409                         *(alpha_dst++) = 255;
2410                 }
2411             }
2412         }
2413     }
2414
2415     delete [] data;
2416
2417     if (has_alpha)
2418         delete [] alpha;
2419
2420     return rotated;
2421 }
2422
2423
2424
2425
2426
2427 // A module to allow wxImage initialization/cleanup
2428 // without calling these functions from app.cpp or from
2429 // the user's application.
2430
2431 class wxImageModule: public wxModule
2432 {
2433 DECLARE_DYNAMIC_CLASS(wxImageModule)
2434 public:
2435     wxImageModule() {}
2436     bool OnInit() { wxImage::InitStandardHandlers(); return true; };
2437     void OnExit() { wxImage::CleanUpHandlers(); };
2438 };
2439
2440 IMPLEMENT_DYNAMIC_CLASS(wxImageModule, wxModule)
2441
2442
2443 #endif // wxUSE_IMAGE