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 #ifdef __GNUG__
  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/filesys.h"
  32 #include "wx/wfstream.h"
  33 #include "wx/intl.h"
  34 #include "wx/module.h"
  35
  36 // For memcpy
  37 #include <string.h>
  38 #include <math.h>
  39
  40 #ifdef __SALFORDC__
  41     #undef FAR
  42 #endif
  43
  44
  45 //-----------------------------------------------------------------------------
  46 // wxImage
  47 //-----------------------------------------------------------------------------
  48
  49 class wxImageRefData: public wxObjectRefData
  50 {
  51 public:
  52     wxImageRefData();
  53     ~wxImageRefData();
  54
  55     int             m_width;
  56     int             m_height;
  57     unsigned char  *m_data;
  58     bool            m_hasMask;
  59     unsigned char   m_maskRed,m_maskGreen,m_maskBlue;
  60     bool            m_ok;
  61     bool            m_static;
  62     wxPalette       m_palette;
  63     wxArrayString   m_optionNames;
  64     wxArrayString   m_optionValues;
  65 };
  66
  67 wxImageRefData::wxImageRefData()
  68 {
  69     m_width = 0;
  70     m_height = 0;
  71     m_data = (unsigned char*) NULL;
  72     m_ok = FALSE;
  73     m_maskRed = 0;
  74     m_maskGreen = 0;
  75     m_maskBlue = 0;
  76     m_hasMask = FALSE;
  77     m_static = FALSE;
  78 }
  79
  80 wxImageRefData::~wxImageRefData()
  81 {
  82     if (m_data && !m_static)
  83         free( m_data );
  84 }
  85
  86 wxList wxImage::sm_handlers;
  87
  88 wxImage wxNullImage;
  89
  90 //-----------------------------------------------------------------------------
  91
  92 #define M_IMGDATA ((wxImageRefData *)m_refData)
  93
  94 IMPLEMENT_DYNAMIC_CLASS(wxImage, wxObject)
  95
  96 wxImage::wxImage()
  97 {
  98 }
  99
 100 wxImage::wxImage( int width, int height )
 101 {
 102     Create( width, height );
 103 }
 104
 105 wxImage::wxImage( int width, int height, unsigned char* data, bool static_data )
 106 {
 107     Create( width, height, data, static_data );
 108 }
 109
 110 wxImage::wxImage( const wxString& name, long type )
 111 {
 112     LoadFile( name, type );
 113 }
 114
 115 wxImage::wxImage( const wxString& name, const wxString& mimetype )
 116 {
 117     LoadFile( name, mimetype );
 118 }
 119
 120 #if wxUSE_STREAMS
 121 wxImage::wxImage( wxInputStream& stream, long type )
 122 {
 123     LoadFile( stream, type );
 124 }
 125
 126 wxImage::wxImage( wxInputStream& stream, const wxString& mimetype )
 127 {
 128     LoadFile( stream, mimetype );
 129 }
 130 #endif // wxUSE_STREAMS
 131
 132 wxImage::wxImage( const wxImage& image )
 133 {
 134     Ref(image);
 135 }
 136
 137 wxImage::wxImage( const wxImage* image )
 138 {
 139     if (image) Ref(*image);
 140 }
 141
 142 void wxImage::Create( int width, int height )
 143 {
 144     UnRef();
 145
 146     m_refData = new wxImageRefData();
 147
 148     M_IMGDATA->m_data = (unsigned char *) malloc( width*height*3 );
 149     if (M_IMGDATA->m_data)
 150     {
 151         for (int l = 0; l < width*height*3; l++) M_IMGDATA->m_data[l] = 0;
 152
 153         M_IMGDATA->m_width = width;
 154         M_IMGDATA->m_height = height;
 155         M_IMGDATA->m_ok = TRUE;
 156     }
 157     else
 158     {
 159         UnRef();
 160     }
 161 }
 162
 163 void wxImage::Create( int width, int height, unsigned char* data, bool static_data )
 164 {
 165     UnRef();
 166
 167     m_refData = new wxImageRefData();
 168
 169     M_IMGDATA->m_data = data;
 170     if (M_IMGDATA->m_data)
 171     {
 172         M_IMGDATA->m_width = width;
 173         M_IMGDATA->m_height = height;
 174         M_IMGDATA->m_ok = TRUE;
 175         M_IMGDATA->m_static = static_data;
 176     }
 177     else
 178     {
 179         UnRef();
 180     }
 181 }
 182
 183 void wxImage::Destroy()
 184 {
 185     UnRef();
 186 }
 187
 188 wxImage wxImage::Copy() const
 189 {
 190     wxImage image;
 191
 192     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 193
 194     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height );
 195
 196     char unsigned *data = image.GetData();
 197
 198     wxCHECK_MSG( data, image, wxT("unable to create image") );
 199
 200     if (M_IMGDATA->m_hasMask)
 201         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 202
 203     memcpy( data, GetData(), M_IMGDATA->m_width*M_IMGDATA->m_height*3 );
 204
 205     return image;
 206 }
 207
 208 wxImage wxImage::Scale( int width, int height ) const
 209 {
 210     wxImage image;
 211
 212     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 213
 214     wxCHECK_MSG( (width > 0) && (height > 0), image, wxT("invalid image size") );
 215
 216     image.Create( width, height );
 217
 218     char unsigned *data = image.GetData();
 219
 220     wxCHECK_MSG( data, image, wxT("unable to create image") );
 221
 222     if (M_IMGDATA->m_hasMask)
 223         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 224
 225     long old_height = M_IMGDATA->m_height;
 226     long old_width  = M_IMGDATA->m_width;
 227
 228     char unsigned *source_data = M_IMGDATA->m_data;
 229     char unsigned *target_data = data;
 230
 231     for (long j = 0; j < height; j++)
 232     {
 233         long y_offset = (j * (old_height-1) / (height-1)) * old_width;
 234
 235         for (long i = 0; i < width; i++)
 236         {
 237             memcpy( target_data,
 238                 source_data + 3*(y_offset + ((i * (old_width-1) )/ (width-1))),
 239                 3 );
 240             target_data += 3;
 241         }
 242     }
 243
 244     return image;
 245 }
 246
 247 wxImage wxImage::Rotate90( bool clockwise ) const
 248 {
 249     wxImage image;
 250
 251     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 252
 253     image.Create( M_IMGDATA->m_height, M_IMGDATA->m_width );
 254
 255     char unsigned *data = image.GetData();
 256
 257     wxCHECK_MSG( data, image, wxT("unable to create image") );
 258
 259     if (M_IMGDATA->m_hasMask)
 260         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 261
 262     long height = M_IMGDATA->m_height;
 263     long width  = M_IMGDATA->m_width;
 264
 265     char unsigned *source_data = M_IMGDATA->m_data;
 266     char unsigned *target_data;
 267
 268     for (long j = 0; j < height; j++)
 269     {
 270         for (long i = 0; i < width; i++)
 271         {
 272             if (clockwise)
 273                 target_data = data + (((i+1)*height) - j - 1)*3;
 274             else
 275                 target_data = data + ((height*(width-1)) + j - (i*height))*3;
 276             memcpy( target_data, source_data, 3 );
 277             source_data += 3;
 278         }
 279     }
 280
 281     return image;
 282 }
 283
 284 wxImage wxImage::Mirror( bool horizontally ) const
 285 {
 286     wxImage image;
 287
 288     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 289
 290     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height );
 291
 292     char unsigned *data = image.GetData();
 293
 294     wxCHECK_MSG( data, image, wxT("unable to create image") );
 295
 296     if (M_IMGDATA->m_hasMask)
 297         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 298
 299     long height = M_IMGDATA->m_height;
 300     long width  = M_IMGDATA->m_width;
 301
 302     char unsigned *source_data = M_IMGDATA->m_data;
 303     char unsigned *target_data;
 304
 305     if (horizontally)
 306     {
 307         for (long j = 0; j < height; j++)
 308         {
 309             data += width*3;
 310             target_data = data-3;
 311             for (long i = 0; i < width; i++)
 312             {
 313                 memcpy( target_data, source_data, 3 );
 314                 source_data += 3;
 315                 target_data -= 3;
 316             }
 317         }
 318     }
 319     else
 320     {
 321         for (long i = 0; i < height; i++)
 322         {
 323             target_data = data + 3*width*(height-1-i);
 324             memcpy( target_data, source_data, (size_t)3*width );
 325             source_data += 3*width;
 326         }
 327     }
 328
 329     return image;
 330 }
 331
 332 wxImage wxImage::GetSubImage( const wxRect &rect ) const
 333 {
 334     wxImage image;
 335
 336     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 337
 338     wxCHECK_MSG( (rect.GetLeft()>=0) && (rect.GetTop()>=0) && (rect.GetRight()<=GetWidth()) && (rect.GetBottom()<=GetHeight()),
 339                  image, wxT("invalid subimage size") );
 340
 341     int subwidth=rect.GetWidth();
 342     const int subheight=rect.GetHeight();
 343
 344     image.Create( subwidth, subheight );
 345
 346     char unsigned *subdata = image.GetData(), *data=GetData();
 347
 348     wxCHECK_MSG( subdata, image, wxT("unable to create image") );
 349
 350     if (M_IMGDATA->m_hasMask)
 351         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 352
 353     const int subleft=3*rect.GetLeft();
 354     const int width=3*GetWidth();
 355     subwidth*=3;
 356
 357     data+=rect.GetTop()*width+subleft;
 358
 359     for (long j = 0; j < subheight; ++j)
 360     {
 361         memcpy( subdata, data, subwidth);
 362         subdata+=subwidth;
 363         data+=width;
 364     }
 365
 366     return image;
 367 }
 368
 369 void wxImage::Paste( const wxImage &image, int x, int y )
 370 {
 371     wxCHECK_RET( Ok(), wxT("invalid image") );
 372     wxCHECK_RET( image.Ok(), wxT("invalid image") );
 373
 374     int xx = 0;
 375     int yy = 0;
 376     int width = image.GetWidth();
 377     int height = image.GetHeight();
 378
 379     if (x < 0)
 380     {
 381         xx = -x;
 382         width += x;
 383     }
 384     if (y < 0)
 385     {
 386         yy = -y;
 387         height += y;
 388     }
 389
 390     if ((x+xx)+width > M_IMGDATA->m_width)
 391         width = M_IMGDATA->m_width - (x+xx);
 392     if ((y+yy)+height > M_IMGDATA->m_height)
 393         height = M_IMGDATA->m_height - (y+yy);
 394
 395     if (width < 1) return;
 396     if (height < 1) return;
 397
 398     if ((!HasMask() && !image.HasMask()) ||
 399        ((HasMask() && image.HasMask() &&
 400          (GetMaskRed()==image.GetMaskRed()) &&
 401          (GetMaskGreen()==image.GetMaskGreen()) &&
 402          (GetMaskBlue()==image.GetMaskBlue()))))
 403     {
 404         width *= 3;
 405         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 406         int source_step = image.GetWidth()*3;
 407
 408         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 409         int target_step = M_IMGDATA->m_width*3;
 410         for (int j = 0; j < height; j++)
 411         {
 412             memcpy( target_data, source_data, width );
 413             source_data += source_step;
 414             target_data += target_step;
 415         }
 416         return;
 417     }
 418
 419     if (!HasMask() && image.HasMask())
 420     {
 421         unsigned char r = image.GetMaskRed();
 422         unsigned char g = image.GetMaskGreen();
 423         unsigned char b = image.GetMaskBlue();
 424
 425         width *= 3;
 426         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 427         int source_step = image.GetWidth()*3;
 428
 429         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 430         int target_step = M_IMGDATA->m_width*3;
 431
 432         for (int j = 0; j < height; j++)
 433         {
 434             for (int i = 0; i < width; i+=3)
 435             {
 436                 if ((source_data[i]   != r) &&
 437                     (source_data[i+1] != g) &&
 438                     (source_data[i+2] != b))
 439                 {
 440                     memcpy( target_data+i, source_data+i, 3 );
 441                 }
 442             }
 443             source_data += source_step;
 444             target_data += target_step;
 445         }
 446     }
 447 }
 448
 449 void wxImage::Replace( unsigned char r1, unsigned char g1, unsigned char b1,
 450                        unsigned char r2, unsigned char g2, unsigned char b2 )
 451 {
 452     wxCHECK_RET( Ok(), wxT("invalid image") );
 453
 454     char unsigned *data = GetData();
 455
 456     const int w = GetWidth();
 457     const int h = GetHeight();
 458
 459     for (int j = 0; j < h; j++)
 460         for (int i = 0; i < w; i++)
 461         {
 462             if ((data[0] == r1) && (data[1] == g1) && (data[2] == b1))
 463             {
 464                 data[0] = r2;
 465                 data[1] = g2;
 466                 data[2] = b2;
 467             }
 468             data += 3;
 469         }
 470 }
 471
 472 wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const
 473 {
 474     wxImage image;
 475
 476     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 477
 478     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height );
 479
 480     char unsigned *data = image.GetData();
 481
 482     wxCHECK_MSG( data, image, wxT("unable to create image") );
 483
 484     if (M_IMGDATA->m_hasMask)
 485     {
 486         if (M_IMGDATA->m_maskRed == r && M_IMGDATA->m_maskGreen == g &&
 487                                          M_IMGDATA->m_maskBlue == b)
 488             image.SetMaskColour( 255, 255, 255 );
 489         else
 490             image.SetMaskColour( 0, 0, 0 );
 491     }
 492
 493     long size = M_IMGDATA->m_height * M_IMGDATA->m_width;
 494
 495     char unsigned *srcd = M_IMGDATA->m_data;
 496     char unsigned *tard = image.GetData();
 497
 498     for ( long i = 0; i < size; i++, srcd += 3, tard += 3 )
 499     {
 500         if (srcd[0] == r && srcd[1] == g && srcd[2] == b)
 501             tard[0] = tard[1] = tard[2] = 255;
 502         else
 503             tard[0] = tard[1] = tard[2] = 0;
 504     }
 505
 506     return image;
 507 }
 508
 509 void wxImage::SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b )
 510 {
 511     wxCHECK_RET( Ok(), wxT("invalid image") );
 512
 513     int w = M_IMGDATA->m_width;
 514     int h = M_IMGDATA->m_height;
 515
 516     wxCHECK_RET( (x>=0) && (y>=0) && (x<w) && (y<h), wxT("invalid image index") );
 517
 518     long pos = (y * w + x) * 3;
 519
 520     M_IMGDATA->m_data[ pos   ] = r;
 521     M_IMGDATA->m_data[ pos+1 ] = g;
 522     M_IMGDATA->m_data[ pos+2 ] = b;
 523 }
 524
 525 unsigned char wxImage::GetRed( int x, int y ) const
 526 {
 527     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 528
 529     int w = M_IMGDATA->m_width;
 530     int h = M_IMGDATA->m_height;
 531
 532     wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
 533
 534     long pos = (y * w + x) * 3;
 535
 536     return M_IMGDATA->m_data[pos];
 537 }
 538
 539 unsigned char wxImage::GetGreen( int x, int y ) const
 540 {
 541     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 542
 543     int w = M_IMGDATA->m_width;
 544     int h = M_IMGDATA->m_height;
 545
 546     wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
 547
 548     long pos = (y * w + x) * 3;
 549
 550     return M_IMGDATA->m_data[pos+1];
 551 }
 552
 553 unsigned char wxImage::GetBlue( int x, int y ) const
 554 {
 555     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 556
 557     int w = M_IMGDATA->m_width;
 558     int h = M_IMGDATA->m_height;
 559
 560     wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
 561
 562     long pos = (y * w + x) * 3;
 563
 564     return M_IMGDATA->m_data[pos+2];
 565 }
 566
 567 bool wxImage::Ok() const
 568 {
 569     // image of 0 width or height can't be considered ok - at least because it
 570     // causes crashes in ConvertToBitmap() if we don't catch it in time
 571     wxImageRefData *data = M_IMGDATA;
 572     return data && data->m_ok && data->m_width && data->m_height;
 573 }
 574
 575 char unsigned *wxImage::GetData() const
 576 {
 577     wxCHECK_MSG( Ok(), (char unsigned *)NULL, wxT("invalid image") );
 578
 579     return M_IMGDATA->m_data;
 580 }
 581
 582 void wxImage::SetData( char unsigned *data )
 583 {
 584     wxCHECK_RET( Ok(), wxT("invalid image") );
 585
 586     wxImageRefData *newRefData = new wxImageRefData();
 587
 588     newRefData->m_width = M_IMGDATA->m_width;
 589     newRefData->m_height = M_IMGDATA->m_height;
 590     newRefData->m_data = data;
 591     newRefData->m_ok = TRUE;
 592     newRefData->m_maskRed = M_IMGDATA->m_maskRed;
 593     newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
 594     newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
 595     newRefData->m_hasMask = M_IMGDATA->m_hasMask;
 596
 597     UnRef();
 598
 599     m_refData = newRefData;
 600 }
 601
 602 void wxImage::SetData( char unsigned *data, int new_width, int new_height )
 603 {
 604     wxImageRefData *newRefData = new wxImageRefData();
 605
 606     if (m_refData)
 607     {
 608         newRefData->m_width = new_width;
 609         newRefData->m_height = new_height;
 610         newRefData->m_data = data;
 611         newRefData->m_ok = TRUE;
 612         newRefData->m_maskRed = M_IMGDATA->m_maskRed;
 613         newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
 614         newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
 615         newRefData->m_hasMask = M_IMGDATA->m_hasMask;
 616     }
 617     else
 618     {
 619         newRefData->m_width = new_width;
 620         newRefData->m_height = new_height;
 621         newRefData->m_data = data;
 622         newRefData->m_ok = TRUE;
 623     }
 624
 625     UnRef();
 626
 627     m_refData = newRefData;
 628 }
 629
 630 void wxImage::SetMaskColour( unsigned char r, unsigned char g, unsigned char b )
 631 {
 632     wxCHECK_RET( Ok(), wxT("invalid image") );
 633
 634     M_IMGDATA->m_maskRed = r;
 635     M_IMGDATA->m_maskGreen = g;
 636     M_IMGDATA->m_maskBlue = b;
 637     M_IMGDATA->m_hasMask = TRUE;
 638 }
 639
 640 unsigned char wxImage::GetMaskRed() const
 641 {
 642     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 643
 644     return M_IMGDATA->m_maskRed;
 645 }
 646
 647 unsigned char wxImage::GetMaskGreen() const
 648 {
 649     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 650
 651     return M_IMGDATA->m_maskGreen;
 652 }
 653
 654 unsigned char wxImage::GetMaskBlue() const
 655 {
 656     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 657
 658     return M_IMGDATA->m_maskBlue;
 659 }
 660
 661 void wxImage::SetMask( bool mask )
 662 {
 663     wxCHECK_RET( Ok(), wxT("invalid image") );
 664
 665     M_IMGDATA->m_hasMask = mask;
 666 }
 667
 668 bool wxImage::HasMask() const
 669 {
 670     wxCHECK_MSG( Ok(), FALSE, wxT("invalid image") );
 671
 672     return M_IMGDATA->m_hasMask;
 673 }
 674
 675 int wxImage::GetWidth() const
 676 {
 677     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 678
 679     return M_IMGDATA->m_width;
 680 }
 681
 682 int wxImage::GetHeight() const
 683 {
 684     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 685
 686     return M_IMGDATA->m_height;
 687 }
 688
 689 // Palette functions
 690
 691 bool wxImage::HasPalette() const
 692 {
 693     if (!Ok())
 694         return FALSE;
 695
 696     return M_IMGDATA->m_palette.Ok();
 697 }
 698
 699 const wxPalette& wxImage::GetPalette() const
 700 {
 701     wxCHECK_MSG( Ok(), wxNullPalette, wxT("invalid image") );
 702
 703     return M_IMGDATA->m_palette;
 704 }
 705
 706 void wxImage::SetPalette(const wxPalette& palette)
 707 {
 708     wxCHECK_RET( Ok(), wxT("invalid image") );
 709
 710     M_IMGDATA->m_palette = palette;
 711 }
 712
 713 // Option functions (arbitrary name/value mapping)
 714 void wxImage::SetOption(const wxString& name, const wxString& value)
 715 {
 716     wxCHECK_RET( Ok(), wxT("invalid image") );
 717
 718     int idx = M_IMGDATA->m_optionNames.Index(name, FALSE);
 719     if (idx == wxNOT_FOUND)
 720     {
 721         M_IMGDATA->m_optionNames.Add(name);
 722         M_IMGDATA->m_optionValues.Add(value);
 723     }
 724     else
 725     {
 726         M_IMGDATA->m_optionNames[idx] = name;
 727         M_IMGDATA->m_optionValues[idx] = value;
 728     }
 729 }
 730
 731 void wxImage::SetOption(const wxString& name, int value)
 732 {
 733     wxString valStr;
 734     valStr.Printf(wxT("%d"), value);
 735     SetOption(name, valStr);
 736 }
 737
 738 wxString wxImage::GetOption(const wxString& name) const
 739 {
 740     wxCHECK_MSG( Ok(), wxEmptyString, wxT("invalid image") );
 741
 742     int idx = M_IMGDATA->m_optionNames.Index(name, FALSE);
 743     if (idx == wxNOT_FOUND)
 744         return wxEmptyString;
 745     else
 746         return M_IMGDATA->m_optionValues[idx];
 747 }
 748
 749 int wxImage::GetOptionInt(const wxString& name) const
 750 {
 751     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 752
 753     return wxAtoi(GetOption(name));
 754 }
 755
 756 bool wxImage::HasOption(const wxString& name) const
 757 {
 758     wxCHECK_MSG( Ok(), FALSE, wxT("invalid image") );
 759
 760     return (M_IMGDATA->m_optionNames.Index(name, FALSE) != wxNOT_FOUND);
 761 }
 762
 763 bool wxImage::LoadFile( const wxString& filename, long type )
 764 {
 765 #if wxUSE_STREAMS
 766     // We want to use wxFileSystem for virtual FS compatibility
 767     wxFileSystem fsys;
 768     wxFSFile *file = fsys.OpenFile(filename);
 769     if (!file)
 770     {
 771         wxLogError(_("Can't open file '%s'"), filename.c_str());
 772         return FALSE;
 773     }
 774     wxInputStream *stream = file->GetStream();
 775     if (!stream)
 776     {
 777         wxLogError(_("Can't open stream for file '%s'"), filename.c_str());
 778         return FALSE;
 779     }
 780
 781     return LoadFile(*stream, type);
 782 #else // !wxUSE_STREAMS
 783     return FALSE;
 784 #endif // wxUSE_STREAMS
 785 }
 786
 787 bool wxImage::LoadFile( const wxString& filename, const wxString& mimetype )
 788 {
 789 #if wxUSE_STREAMS
 790     // We want to use wxFileSystem for virtual FS compatibility
 791     wxFileSystem fsys;
 792     wxFSFile *file = fsys.OpenFile(filename);
 793     if (!file)
 794     {
 795         wxLogError(_("Can't open file '%s'"), filename.c_str());
 796         return FALSE;
 797     }
 798     wxInputStream *stream = file->GetStream();
 799     if (!stream)
 800     {
 801         wxLogError(_("Can't open stream for file '%s'"), filename.c_str());
 802         return FALSE;
 803     }
 804     return LoadFile(*stream, mimetype);
 805 #else // !wxUSE_STREAMS
 806     return FALSE;
 807 #endif // wxUSE_STREAMS
 808 }
 809
 810 bool wxImage::SaveFile( const wxString& filename, int type )
 811 {
 812 #if wxUSE_STREAMS
 813     wxFileOutputStream stream(filename);
 814
 815     if ( stream.LastError() == wxStream_NOERROR )
 816     {
 817         wxBufferedOutputStream bstream( stream );
 818         return SaveFile(bstream, type);
 819     }
 820 #endif // wxUSE_STREAMS
 821
 822     return FALSE;
 823 }
 824
 825 bool wxImage::SaveFile( const wxString& filename, const wxString& mimetype )
 826 {
 827 #if wxUSE_STREAMS
 828     wxFileOutputStream stream(filename);
 829
 830     if ( stream.LastError() == wxStream_NOERROR )
 831     {
 832         wxBufferedOutputStream bstream( stream );
 833         return SaveFile(bstream, mimetype);
 834     }
 835 #endif // wxUSE_STREAMS
 836
 837     return FALSE;
 838 }
 839
 840 bool wxImage::CanRead( const wxString &name )
 841 {
 842 #if wxUSE_STREAMS
 843   wxFileInputStream stream(name);
 844   return CanRead(stream);
 845 #else
 846   return FALSE;
 847 #endif
 848 }
 849
 850 #if wxUSE_STREAMS
 851
 852 bool wxImage::CanRead( wxInputStream &stream )
 853 {
 854   wxList &list=GetHandlers();
 855
 856   for ( wxList::Node *node = list.GetFirst(); node; node = node->GetNext() )
 857     {
 858       wxImageHandler *handler=(wxImageHandler*)node->GetData();
 859       if (handler->CanRead( stream ))
 860         return TRUE;
 861     }
 862
 863   return FALSE;
 864 }
 865
 866 bool wxImage::LoadFile( wxInputStream& stream, long type )
 867 {
 868     UnRef();
 869
 870     m_refData = new wxImageRefData;
 871
 872     wxImageHandler *handler;
 873
 874     if (type==wxBITMAP_TYPE_ANY)
 875     {
 876         wxList &list=GetHandlers();
 877
 878         for ( wxList::Node *node = list.GetFirst(); node; node = node->GetNext() )
 879         {
 880              handler=(wxImageHandler*)node->GetData();
 881              if (handler->CanRead( stream ))
 882                  return handler->LoadFile( this, stream );
 883
 884         }
 885
 886         wxLogWarning( _("No handler found for image type.") );
 887         return FALSE;
 888     }
 889
 890     handler = FindHandler(type);
 891
 892     if (handler == NULL)
 893     {
 894         wxLogWarning( _("No image handler for type %d defined."), type );
 895
 896         return FALSE;
 897     }
 898
 899     return handler->LoadFile( this, stream );
 900 }
 901
 902 bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype )
 903 {
 904     UnRef();
 905
 906     m_refData = new wxImageRefData;
 907
 908     wxImageHandler *handler = FindHandlerMime(mimetype);
 909
 910     if (handler == NULL)
 911     {
 912         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
 913
 914         return FALSE;
 915     }
 916
 917     return handler->LoadFile( this, stream );
 918 }
 919
 920 bool wxImage::SaveFile( wxOutputStream& stream, int type )
 921 {
 922     wxCHECK_MSG( Ok(), FALSE, wxT("invalid image") );
 923
 924     wxImageHandler *handler = FindHandler(type);
 925
 926     if (handler == NULL)
 927     {
 928         wxLogWarning( _("No image handler for type %d defined."), type );
 929
 930         return FALSE;
 931     }
 932
 933     return handler->SaveFile( this, stream );
 934 }
 935
 936 bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype )
 937 {
 938     wxCHECK_MSG( Ok(), FALSE, wxT("invalid image") );
 939
 940     wxImageHandler *handler = FindHandlerMime(mimetype);
 941
 942     if (handler == NULL)
 943     {
 944         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
 945
 946         return FALSE;
 947     }
 948
 949     return handler->SaveFile( this, stream );
 950 }
 951 #endif // wxUSE_STREAMS
 952
 953 void wxImage::AddHandler( wxImageHandler *handler )
 954 {
 955     // make sure that the memory will be freed at the program end
 956     sm_handlers.DeleteContents(TRUE);
 957
 958     sm_handlers.Append( handler );
 959 }
 960
 961 void wxImage::InsertHandler( wxImageHandler *handler )
 962 {
 963     // make sure that the memory will be freed at the program end
 964     sm_handlers.DeleteContents(TRUE);
 965
 966     sm_handlers.Insert( handler );
 967 }
 968
 969 bool wxImage::RemoveHandler( const wxString& name )
 970 {
 971     wxImageHandler *handler = FindHandler(name);
 972     if (handler)
 973     {
 974         sm_handlers.DeleteObject(handler);
 975         return TRUE;
 976     }
 977     else
 978         return FALSE;
 979 }
 980
 981 wxImageHandler *wxImage::FindHandler( const wxString& name )
 982 {
 983     wxNode *node = sm_handlers.First();
 984     while (node)
 985     {
 986         wxImageHandler *handler = (wxImageHandler*)node->Data();
 987         if (handler->GetName().Cmp(name) == 0) return handler;
 988
 989         node = node->Next();
 990     }
 991     return (wxImageHandler *)NULL;
 992 }
 993
 994 wxImageHandler *wxImage::FindHandler( const wxString& extension, long bitmapType )
 995 {
 996     wxNode *node = sm_handlers.First();
 997     while (node)
 998     {
 999         wxImageHandler *handler = (wxImageHandler*)node->Data();
1000         if ( (handler->GetExtension().Cmp(extension) == 0) &&
1001             (bitmapType == -1 || handler->GetType() == bitmapType) )
1002             return handler;
1003         node = node->Next();
1004     }
1005     return (wxImageHandler*)NULL;
1006 }
1007
1008 wxImageHandler *wxImage::FindHandler( long bitmapType )
1009 {
1010     wxNode *node = sm_handlers.First();
1011     while (node)
1012     {
1013         wxImageHandler *handler = (wxImageHandler *)node->Data();
1014         if (handler->GetType() == bitmapType) return handler;
1015         node = node->Next();
1016     }
1017     return NULL;
1018 }
1019
1020 wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype )
1021 {
1022     wxNode *node = sm_handlers.First();
1023     while (node)
1024     {
1025         wxImageHandler *handler = (wxImageHandler *)node->Data();
1026         if (handler->GetMimeType().IsSameAs(mimetype, FALSE)) return handler;
1027         node = node->Next();
1028     }
1029     return NULL;
1030 }
1031
1032 void wxImage::InitStandardHandlers()
1033 {
1034     AddHandler(new wxBMPHandler);
1035 #if !defined(__WXGTK__) && !defined(__WXMOTIF__)
1036     AddHandler(new wxXPMHandler);
1037 #endif
1038 }
1039
1040 void wxImage::CleanUpHandlers()
1041 {
1042     wxNode *node = sm_handlers.First();
1043     while (node)
1044     {
1045         wxImageHandler *handler = (wxImageHandler *)node->Data();
1046         wxNode *next = node->Next();
1047         delete handler;
1048         delete node;
1049         node = next;
1050     }
1051 }
1052
1053 //-----------------------------------------------------------------------------
1054 // wxImageHandler
1055 //-----------------------------------------------------------------------------
1056
1057 IMPLEMENT_ABSTRACT_CLASS(wxImageHandler,wxObject)
1058
1059 #if wxUSE_STREAMS
1060 bool wxImageHandler::LoadFile( wxImage *WXUNUSED(image), wxInputStream& WXUNUSED(stream), bool WXUNUSED(verbose), int WXUNUSED(index) )
1061 {
1062     return FALSE;
1063 }
1064
1065 bool wxImageHandler::SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream), bool WXUNUSED(verbose) )
1066 {
1067     return FALSE;
1068 }
1069
1070 int wxImageHandler::GetImageCount( wxInputStream& WXUNUSED(stream) )
1071 {
1072     return 1;
1073 }
1074
1075 bool wxImageHandler::CanRead( const wxString& name )
1076 {
1077     if (wxFileExists(name))
1078     {
1079         wxFileInputStream stream(name);
1080         return CanRead(stream);
1081     }
1082
1083     else {
1084         wxLogError( _("Can't check image format of file '%s': file does not exist."), name.c_str() );
1085
1086         return FALSE;
1087     }
1088 //    return FALSE;
1089 }
1090
1091 #endif // wxUSE_STREAMS
1092
1093
1094
1095 //-----------------------------------------------------------------------------
1096 // wxBitmap convertion routines
1097 //-----------------------------------------------------------------------------
1098
1099 #if wxUSE_GUI
1100
1101 #ifdef __WXGTK__
1102 wxBitmap wxImage::ConvertToMonoBitmap( unsigned char red, unsigned char green, unsigned char blue ) const
1103 {
1104     wxImage mono = this->ConvertToMono( red, green, blue );
1105     wxBitmap bitmap( mono, 1 );
1106     return bitmap;
1107 }
1108 #endif
1109
1110 wxBitmap wxImage::ConvertToBitmap() const
1111 {
1112     wxBitmap bitmap( *this );
1113     return bitmap;
1114 }
1115
1116 wxImage::wxImage( const wxBitmap &bitmap )
1117 {
1118     *this = bitmap.ConvertToImage();
1119 }
1120
1121 #endif
1122
1123
1124
1125 // A module to allow wxImage initialization/cleanup
1126 // without calling these functions from app.cpp or from
1127 // the user's application.
1128
1129 class wxImageModule: public wxModule
1130 {
1131 DECLARE_DYNAMIC_CLASS(wxImageModule)
1132 public:
1133     wxImageModule() {}
1134     bool OnInit() { wxImage::InitStandardHandlers(); return TRUE; };
1135     void OnExit() { wxImage::CleanUpHandlers(); };
1136 };
1137
1138 IMPLEMENT_DYNAMIC_CLASS(wxImageModule, wxModule)
1139
1140
1141 //-----------------------------------------------------------------------------
1142
1143 // GRG, Dic/99
1144 // Counts and returns the number of different colours. Optionally stops
1145 // when it exceeds 'stopafter' different colours. This is useful, for
1146 // example, to see if the image can be saved as 8-bit (256 colour or
1147 // less, in this case it would be invoked as CountColours(256)). Default
1148 // value for stopafter is -1 (don't care).
1149 //
1150 unsigned long wxImage::CountColours( unsigned long stopafter )
1151 {
1152     wxHashTable h;
1153     wxObject dummy;
1154     unsigned char r, g, b;
1155     unsigned char *p;
1156     unsigned long size, nentries, key;
1157
1158     p = GetData();
1159     size = GetWidth() * GetHeight();
1160     nentries = 0;
1161
1162     for (unsigned long j = 0; (j < size) && (nentries <= stopafter) ; j++)
1163     {
1164         r = *(p++);
1165         g = *(p++);
1166         b = *(p++);
1167         key = (r << 16) | (g << 8) | b;
1168
1169         if (h.Get(key) == NULL)
1170         {
1171             h.Put(key, &dummy);
1172             nentries++;
1173         }
1174     }
1175
1176     return nentries;
1177 }
1178
1179
1180 // GRG, Dic/99
1181 // Computes the histogram of the image and fills a hash table, indexed
1182 // with integer keys built as 0xRRGGBB, containing wxHNode objects. Each
1183 // wxHNode contains an 'index' (useful to build a palette with the image
1184 // colours) and a 'value', which is the number of pixels in the image with
1185 // that colour.
1186 //
1187 unsigned long wxImage::ComputeHistogram( wxHashTable &h )
1188 {
1189     unsigned char r, g, b;
1190     unsigned char *p;
1191     unsigned long size, nentries, key;
1192     wxHNode *hnode;
1193
1194     p = GetData();
1195     size = GetWidth() * GetHeight();
1196     nentries = 0;
1197
1198     for (unsigned long j = 0; j < size; j++)
1199     {
1200         r = *(p++);
1201         g = *(p++);
1202         b = *(p++);
1203         key = (r << 16) | (g << 8) | b;
1204
1205         hnode = (wxHNode *) h.Get(key);
1206
1207         if (hnode)
1208             hnode->value++;
1209         else
1210         {
1211             hnode = new wxHNode();
1212             hnode->index = nentries++;
1213             hnode->value = 1;
1214
1215             h.Put(key, (wxObject *)hnode);
1216         }
1217     }
1218
1219     return nentries;
1220 }
1221
1222 /*
1223  * Rotation code by Carlos Moreno
1224  */
1225
1226 // GRG: I've removed wxRotationPoint - we already have wxRealPoint which
1227 //      does exactly the same thing. And I also got rid of wxRotationPixel
1228 //      bacause of potential problems in architectures where alignment
1229 //      is an issue, so I had to rewrite parts of the code.
1230
1231 static const double gs_Epsilon = 1e-10;
1232
1233 static inline int wxCint (double x)
1234 {
1235     return (x > 0) ? (int) (x + 0.5) : (int) (x - 0.5);
1236 }
1237
1238
1239 // Auxiliary function to rotate a point (x,y) with respect to point p0
1240 // make it inline and use a straight return to facilitate optimization
1241 // also, the function receives the sine and cosine of the angle to avoid
1242 // repeating the time-consuming calls to these functions -- sin/cos can
1243 // be computed and stored in the calling function.
1244
1245 inline wxRealPoint rotated_point (const wxRealPoint & p, double cos_angle, double sin_angle, const wxRealPoint & p0)
1246 {
1247     return wxRealPoint (p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle,
1248                         p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle);
1249 }
1250
1251 inline wxRealPoint rotated_point (double x, double y, double cos_angle, double sin_angle, const wxRealPoint & p0)
1252 {
1253     return rotated_point (wxRealPoint(x,y), cos_angle, sin_angle, p0);
1254 }
1255
1256 wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool interpolating, wxPoint * offset_after_rotation) const
1257 {
1258     int i;
1259     angle = -angle;     // screen coordinates are a mirror image of "real" coordinates
1260
1261     // Create pointer-based array to accelerate access to wxImage's data
1262     unsigned char ** data = new unsigned char * [GetHeight()];
1263
1264     data[0] = GetData();
1265
1266     for (i = 1; i < GetHeight(); i++)
1267         data[i] = data[i - 1] + (3 * GetWidth());
1268
1269     // precompute coefficients for rotation formula
1270     // (sine and cosine of the angle)
1271     const double cos_angle = cos(angle);
1272     const double sin_angle = sin(angle);
1273
1274     // Create new Image to store the result
1275     // First, find rectangle that covers the rotated image;  to do that,
1276     // rotate the four corners
1277
1278     const wxRealPoint p0(centre_of_rotation.x, centre_of_rotation.y);
1279
1280     wxRealPoint p1 = rotated_point (0, 0, cos_angle, sin_angle, p0);
1281     wxRealPoint p2 = rotated_point (0, GetHeight(), cos_angle, sin_angle, p0);
1282     wxRealPoint p3 = rotated_point (GetWidth(), 0, cos_angle, sin_angle, p0);
1283     wxRealPoint p4 = rotated_point (GetWidth(), GetHeight(), cos_angle, sin_angle, p0);
1284
1285     int x1 = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x)));
1286     int y1 = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y)));
1287     int x2 = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x)));
1288     int y2 = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y)));
1289
1290     wxImage rotated (x2 - x1 + 1, y2 - y1 + 1);
1291
1292     if (offset_after_rotation != NULL)
1293     {
1294         *offset_after_rotation = wxPoint (x1, y1);
1295     }
1296
1297     // GRG: The rotated (destination) image is always accessed
1298     //      sequentially, so there is no need for a pointer-based
1299     //      array here (and in fact it would be slower).
1300     //
1301     unsigned char * dst = rotated.GetData();
1302
1303     // GRG: if the original image has a mask, use its RGB values
1304     //      as the blank pixel, else, fall back to default (black).
1305     //
1306     unsigned char blank_r = 0;
1307     unsigned char blank_g = 0;
1308     unsigned char blank_b = 0;
1309
1310     if (HasMask())
1311     {
1312         blank_r = GetMaskRed();
1313         blank_g = GetMaskGreen();
1314         blank_b = GetMaskBlue();
1315         rotated.SetMaskColour( blank_r, blank_g, blank_b );
1316     }
1317
1318     // Now, for each point of the rotated image, find where it came from, by
1319     // performing an inverse rotation (a rotation of -angle) and getting the
1320     // pixel at those coordinates
1321
1322     // GRG: I've taken the (interpolating) test out of the loops, so that
1323     //      it is done only once, instead of repeating it for each pixel.
1324
1325     int x;
1326     if (interpolating)
1327     {
1328         for (int y = 0; y < rotated.GetHeight(); y++)
1329         {
1330             for (x = 0; x < rotated.GetWidth(); x++)
1331             {
1332                 wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
1333
1334                 if (-0.25 < src.x && src.x < GetWidth() - 0.75 &&
1335                     -0.25 < src.y && src.y < GetHeight() - 0.75)
1336                 {
1337                     // interpolate using the 4 enclosing grid-points.  Those
1338                     // points can be obtained using floor and ceiling of the
1339                     // exact coordinates of the point
1340                         // C.M. 2000-02-17:  when the point is near the border, special care is required.
1341
1342                     int x1, y1, x2, y2;
1343
1344                     if (0 < src.x && src.x < GetWidth() - 1)
1345                     {
1346                         x1 = wxCint(floor(src.x));
1347                         x2 = wxCint(ceil(src.x));
1348                     }
1349                     else    // else means that x is near one of the borders (0 or width-1)
1350                     {
1351                         x1 = x2 = wxCint (src.x);
1352                     }
1353
1354                     if (0 < src.y && src.y < GetHeight() - 1)
1355                     {
1356                         y1 = wxCint(floor(src.y));
1357                         y2 = wxCint(ceil(src.y));
1358                     }
1359                     else
1360                     {
1361                         y1 = y2 = wxCint (src.y);
1362                     }
1363
1364                     // get four points and the distances (square of the distance,
1365                     // for efficiency reasons) for the interpolation formula
1366
1367                     // GRG: Do not calculate the points until they are
1368                     //      really needed -- this way we can calculate
1369                     //      just one, instead of four, if d1, d2, d3
1370                     //      or d4 are < gs_Epsilon
1371
1372                     const double d1 = (src.x - x1) * (src.x - x1) + (src.y - y1) * (src.y - y1);
1373                     const double d2 = (src.x - x2) * (src.x - x2) + (src.y - y1) * (src.y - y1);
1374                     const double d3 = (src.x - x2) * (src.x - x2) + (src.y - y2) * (src.y - y2);
1375                     const double d4 = (src.x - x1) * (src.x - x1) + (src.y - y2) * (src.y - y2);
1376
1377                     // Now interpolate as a weighted average of the four surrounding
1378                     // points, where the weights are the distances to each of those points
1379
1380                     // If the point is exactly at one point of the grid of the source
1381                     // image, then don't interpolate -- just assign the pixel
1382
1383                     if (d1 < gs_Epsilon)        // d1,d2,d3,d4 are positive -- no need for abs()
1384                     {
1385                         unsigned char *p = data[y1] + (3 * x1);
1386                         *(dst++) = *(p++);
1387                         *(dst++) = *(p++);
1388                         *(dst++) = *(p++);
1389                     }
1390                     else if (d2 < gs_Epsilon)
1391                     {
1392                         unsigned char *p = data[y1] + (3 * x2);
1393                         *(dst++) = *(p++);
1394                         *(dst++) = *(p++);
1395                         *(dst++) = *(p++);
1396                     }
1397                     else if (d3 < gs_Epsilon)
1398                     {
1399                         unsigned char *p = data[y2] + (3 * x2);
1400                         *(dst++) = *(p++);
1401                         *(dst++) = *(p++);
1402                         *(dst++) = *(p++);
1403                     }
1404                     else if (d4 < gs_Epsilon)
1405                     {
1406                         unsigned char *p = data[y2] + (3 * x1);
1407                         *(dst++) = *(p++);
1408                         *(dst++) = *(p++);
1409                         *(dst++) = *(p++);
1410                     }
1411                     else
1412                     {
1413                         // weights for the weighted average are proportional to the inverse of the distance
1414                         unsigned char *v1 = data[y1] + (3 * x1);
1415                         unsigned char *v2 = data[y1] + (3 * x2);
1416                         unsigned char *v3 = data[y2] + (3 * x2);
1417                         unsigned char *v4 = data[y2] + (3 * x1);
1418
1419                         const double w1 = 1/d1, w2 = 1/d2, w3 = 1/d3, w4 = 1/d4;
1420
1421                         // GRG: Unrolled.
1422
1423                         *(dst++) = (unsigned char)
1424                             ( (w1 * *(v1++) + w2 * *(v2++) +
1425                                w3 * *(v3++) + w4 * *(v4++)) /
1426                               (w1 + w2 + w3 + w4) );
1427                         *(dst++) = (unsigned char)
1428                             ( (w1 * *(v1++) + w2 * *(v2++) +
1429                                w3 * *(v3++) + w4 * *(v4++)) /
1430                               (w1 + w2 + w3 + w4) );
1431                         *(dst++) = (unsigned char)
1432                             ( (w1 * *(v1++) + w2 * *(v2++) +
1433                                w3 * *(v3++) + w4 * *(v4++)) /
1434                               (w1 + w2 + w3 + w4) );
1435                     }
1436                 }
1437                 else
1438                 {
1439                     *(dst++) = blank_r;
1440                     *(dst++) = blank_g;
1441                     *(dst++) = blank_b;
1442                 }
1443             }
1444         }
1445     }
1446     else    // not interpolating
1447     {
1448         for (int y = 0; y < rotated.GetHeight(); y++)
1449         {
1450             for (x = 0; x < rotated.GetWidth(); x++)
1451             {
1452                 wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
1453
1454                 const int xs = wxCint (src.x);      // wxCint rounds to the
1455                 const int ys = wxCint (src.y);      // closest integer
1456
1457                 if (0 <= xs && xs < GetWidth() &&
1458                     0 <= ys && ys < GetHeight())
1459                 {
1460                     unsigned char *p = data[ys] + (3 * xs);
1461                     *(dst++) = *(p++);
1462                     *(dst++) = *(p++);
1463                     *(dst++) = *(p++);
1464                 }
1465                 else
1466                 {
1467                     *(dst++) = blank_r;
1468                     *(dst++) = blank_g;
1469                     *(dst++) = blank_b;
1470                 }
1471             }
1472         }
1473     }
1474
1475     delete [] data;
1476
1477     return rotated;
1478 }
1479
1480 #endif // wxUSE_IMAGE