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