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/wfstream.h"
  32 #include "wx/intl.h"
  33 #include "wx/module.h"
  34
  35 // For memcpy
  36 #include <string.h>
  37 #include <math.h>
  38
  39 #ifdef __SALFORDC__
  40     #undef FAR
  41 #endif
  42
  43
  44 //-----------------------------------------------------------------------------
  45 // wxImage
  46 //-----------------------------------------------------------------------------
  47
  48 class wxImageRefData: public wxObjectRefData
  49 {
  50 public:
  51     wxImageRefData();
  52     ~wxImageRefData();
  53
  54     int             m_width;
  55     int             m_height;
  56     unsigned char  *m_data;
  57     bool            m_hasMask;
  58     unsigned char   m_maskRed,m_maskGreen,m_maskBlue;
  59     bool            m_ok;
  60     bool            m_static;
  61     wxPalette       m_palette;
  62     wxArrayString   m_optionNames;
  63     wxArrayString   m_optionValues;
  64 };
  65
  66 wxImageRefData::wxImageRefData()
  67 {
  68     m_width = 0;
  69     m_height = 0;
  70     m_data = (unsigned char*) NULL;
  71     m_ok = FALSE;
  72     m_maskRed = 0;
  73     m_maskGreen = 0;
  74     m_maskBlue = 0;
  75     m_hasMask = FALSE;
  76     m_static = FALSE;
  77 }
  78
  79 wxImageRefData::~wxImageRefData()
  80 {
  81     if (m_data && !m_static)
  82         free( m_data );
  83 }
  84
  85 wxList wxImage::sm_handlers;
  86
  87 wxImage wxNullImage;
  88
  89 //-----------------------------------------------------------------------------
  90
  91 #define M_IMGDATA ((wxImageRefData *)m_refData)
  92
  93 IMPLEMENT_DYNAMIC_CLASS(wxImage, wxObject)
  94
  95 wxImage::wxImage()
  96 {
  97 }
  98
  99 wxImage::wxImage( int width, int height )
 100 {
 101     Create( width, height );
 102 }
 103
 104 wxImage::wxImage( int width, int height, unsigned char* data, bool static_data )
 105 {
 106     Create( width, height, data, static_data );
 107 }
 108
 109 wxImage::wxImage( const wxString& name, long type )
 110 {
 111     LoadFile( name, type );
 112 }
 113
 114 wxImage::wxImage( const wxString& name, const wxString& mimetype )
 115 {
 116     LoadFile( name, mimetype );
 117 }
 118
 119 #if wxUSE_STREAMS
 120 wxImage::wxImage( wxInputStream& stream, long type )
 121 {
 122     LoadFile( stream, type );
 123 }
 124
 125 wxImage::wxImage( wxInputStream& stream, const wxString& mimetype )
 126 {
 127     LoadFile( stream, mimetype );
 128 }
 129 #endif // wxUSE_STREAMS
 130
 131 wxImage::wxImage( const wxImage& image )
 132 {
 133     Ref(image);
 134 }
 135
 136 wxImage::wxImage( const wxImage* image )
 137 {
 138     if (image) Ref(*image);
 139 }
 140
 141 void wxImage::Create( int width, int height )
 142 {
 143     UnRef();
 144
 145     m_refData = new wxImageRefData();
 146
 147     M_IMGDATA->m_data = (unsigned char *) malloc( width*height*3 );
 148     if (M_IMGDATA->m_data)
 149     {
 150         for (int l = 0; l < width*height*3; l++) M_IMGDATA->m_data[l] = 0;
 151
 152         M_IMGDATA->m_width = width;
 153         M_IMGDATA->m_height = height;
 154         M_IMGDATA->m_ok = TRUE;
 155     }
 156     else
 157     {
 158         UnRef();
 159     }
 160 }
 161
 162 void wxImage::Create( int width, int height, unsigned char* data, bool static_data )
 163 {
 164     UnRef();
 165
 166     m_refData = new wxImageRefData();
 167
 168     M_IMGDATA->m_data = data;
 169     if (M_IMGDATA->m_data)
 170     {
 171         M_IMGDATA->m_width = width;
 172         M_IMGDATA->m_height = height;
 173         M_IMGDATA->m_ok = TRUE;
 174         M_IMGDATA->m_static = static_data;
 175     }
 176     else
 177     {
 178         UnRef();
 179     }
 180 }
 181
 182 void wxImage::Destroy()
 183 {
 184     UnRef();
 185 }
 186
 187 wxImage wxImage::Copy() const
 188 {
 189     wxImage image;
 190
 191     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 192
 193     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height );
 194
 195     char unsigned *data = image.GetData();
 196
 197     wxCHECK_MSG( data, image, wxT("unable to create image") );
 198
 199     if (M_IMGDATA->m_hasMask)
 200         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 201
 202     memcpy( data, GetData(), M_IMGDATA->m_width*M_IMGDATA->m_height*3 );
 203
 204     return image;
 205 }
 206
 207 wxImage wxImage::Scale( int width, int height ) const
 208 {
 209     wxImage image;
 210
 211     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 212
 213     // can't scale to/from 0 size
 214     wxCHECK_MSG( (width > 0) && (height > 0), image,
 215                  wxT("invalid new image size") );
 216
 217     long old_height = M_IMGDATA->m_height,
 218          old_width  = M_IMGDATA->m_width;
 219     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 220                  wxT("invalid old image size") );
 221
 222     image.Create( width, height );
 223
 224     char unsigned *data = image.GetData();
 225
 226     wxCHECK_MSG( data, image, wxT("unable to create image") );
 227
 228     if (M_IMGDATA->m_hasMask)
 229     {
 230         image.SetMaskColour( M_IMGDATA->m_maskRed,
 231                              M_IMGDATA->m_maskGreen,
 232                              M_IMGDATA->m_maskBlue );
 233     }
 234
 235     char unsigned *source_data = M_IMGDATA->m_data;
 236     char unsigned *target_data = data;
 237
 238 #if 0
 239     // This is nonsense, RR.
 240
 241     // We do (x, y) -> (x, y)*oldSize/newSize but the valid values of x and y
 242     // are from 0 to size-1, hence all decrement the sizes
 243     long old_old_width = old_width;
 244     old_height--;
 245     old_width--;
 246     height--;
 247     width--;
 248     for ( long j = 0; j <= height; j++ )
 249     {
 250         // don't crash for images with height == 1
 251         long y_offset = height ? (j * old_height / height)* old_old_width : 0;
 252
 253         for ( long i = 0; i <= width; i++ )
 254         {
 255             long x_offset = width ? (i * old_width) / width : 0;
 256
 257             memcpy( target_data, source_data + 3*(y_offset + x_offset), 3 );
 258             target_data += 3;
 259         }
 260     }
 261 #else
 262     for (long j = 0; j < height; j++)
 263     {
 264         long y_offset = (j * old_height / height) * old_width;
 265
 266         for (long i = 0; i < width; i++)
 267         {
 268             memcpy( target_data,
 269                 source_data + 3*(y_offset + ((i * old_width )/ width)),
 270                 3 );
 271             target_data += 3;
 272         }
 273     }
 274 #endif
 275
 276     return image;
 277 }
 278
 279 wxImage wxImage::Rotate90( bool clockwise ) const
 280 {
 281     wxImage image;
 282
 283     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 284
 285     image.Create( M_IMGDATA->m_height, M_IMGDATA->m_width );
 286
 287     char unsigned *data = image.GetData();
 288
 289     wxCHECK_MSG( data, image, wxT("unable to create image") );
 290
 291     if (M_IMGDATA->m_hasMask)
 292         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 293
 294     long height = M_IMGDATA->m_height;
 295     long width  = M_IMGDATA->m_width;
 296
 297     char unsigned *source_data = M_IMGDATA->m_data;
 298     char unsigned *target_data;
 299
 300     for (long j = 0; j < height; j++)
 301     {
 302         for (long i = 0; i < width; i++)
 303         {
 304             if (clockwise)
 305                 target_data = data + (((i+1)*height) - j - 1)*3;
 306             else
 307                 target_data = data + ((height*(width-1)) + j - (i*height))*3;
 308             memcpy( target_data, source_data, 3 );
 309             source_data += 3;
 310         }
 311     }
 312
 313     return image;
 314 }
 315
 316 wxImage wxImage::Mirror( bool horizontally ) const
 317 {
 318     wxImage image;
 319
 320     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 321
 322     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height );
 323
 324     char unsigned *data = image.GetData();
 325
 326     wxCHECK_MSG( data, image, wxT("unable to create image") );
 327
 328     if (M_IMGDATA->m_hasMask)
 329         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 330
 331     long height = M_IMGDATA->m_height;
 332     long width  = M_IMGDATA->m_width;
 333
 334     char unsigned *source_data = M_IMGDATA->m_data;
 335     char unsigned *target_data;
 336
 337     if (horizontally)
 338     {
 339         for (long j = 0; j < height; j++)
 340         {
 341             data += width*3;
 342             target_data = data-3;
 343             for (long i = 0; i < width; i++)
 344             {
 345                 memcpy( target_data, source_data, 3 );
 346                 source_data += 3;
 347                 target_data -= 3;
 348             }
 349         }
 350     }
 351     else
 352     {
 353         for (long i = 0; i < height; i++)
 354         {
 355             target_data = data + 3*width*(height-1-i);
 356             memcpy( target_data, source_data, (size_t)3*width );
 357             source_data += 3*width;
 358         }
 359     }
 360
 361     return image;
 362 }
 363
 364 wxImage wxImage::GetSubImage( const wxRect &rect ) const
 365 {
 366     wxImage image;
 367
 368     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 369
 370     wxCHECK_MSG( (rect.GetLeft()>=0) && (rect.GetTop()>=0) && (rect.GetRight()<=GetWidth()) && (rect.GetBottom()<=GetHeight()),
 371                  image, wxT("invalid subimage size") );
 372
 373     int subwidth=rect.GetWidth();
 374     const int subheight=rect.GetHeight();
 375
 376     image.Create( subwidth, subheight );
 377
 378     char unsigned *subdata = image.GetData(), *data=GetData();
 379
 380     wxCHECK_MSG( subdata, image, wxT("unable to create image") );
 381
 382     if (M_IMGDATA->m_hasMask)
 383         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 384
 385     const int subleft=3*rect.GetLeft();
 386     const int width=3*GetWidth();
 387     subwidth*=3;
 388
 389     data+=rect.GetTop()*width+subleft;
 390
 391     for (long j = 0; j < subheight; ++j)
 392     {
 393         memcpy( subdata, data, subwidth);
 394         subdata+=subwidth;
 395         data+=width;
 396     }
 397
 398     return image;
 399 }
 400
 401 void wxImage::Paste( const wxImage &image, int x, int y )
 402 {
 403     wxCHECK_RET( Ok(), wxT("invalid image") );
 404     wxCHECK_RET( image.Ok(), wxT("invalid image") );
 405
 406     int xx = 0;
 407     int yy = 0;
 408     int width = image.GetWidth();
 409     int height = image.GetHeight();
 410
 411     if (x < 0)
 412     {
 413         xx = -x;
 414         width += x;
 415     }
 416     if (y < 0)
 417     {
 418         yy = -y;
 419         height += y;
 420     }
 421
 422     if ((x+xx)+width > M_IMGDATA->m_width)
 423         width = M_IMGDATA->m_width - (x+xx);
 424     if ((y+yy)+height > M_IMGDATA->m_height)
 425         height = M_IMGDATA->m_height - (y+yy);
 426
 427     if (width < 1) return;
 428     if (height < 1) return;
 429
 430     if ((!HasMask() && !image.HasMask()) ||
 431        ((HasMask() && image.HasMask() &&
 432          (GetMaskRed()==image.GetMaskRed()) &&
 433          (GetMaskGreen()==image.GetMaskGreen()) &&
 434          (GetMaskBlue()==image.GetMaskBlue()))))
 435     {
 436         width *= 3;
 437         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 438         int source_step = image.GetWidth()*3;
 439
 440         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 441         int target_step = M_IMGDATA->m_width*3;
 442         for (int j = 0; j < height; j++)
 443         {
 444             memcpy( target_data, source_data, width );
 445             source_data += source_step;
 446             target_data += target_step;
 447         }
 448         return;
 449     }
 450
 451     if (!HasMask() && image.HasMask())
 452     {
 453         unsigned char r = image.GetMaskRed();
 454         unsigned char g = image.GetMaskGreen();
 455         unsigned char b = image.GetMaskBlue();
 456
 457         width *= 3;
 458         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 459         int source_step = image.GetWidth()*3;
 460
 461         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 462         int target_step = M_IMGDATA->m_width*3;
 463
 464         for (int j = 0; j < height; j++)
 465         {
 466             for (int i = 0; i < width; i+=3)
 467             {
 468                 if ((source_data[i]   != r) &&
 469                     (source_data[i+1] != g) &&
 470                     (source_data[i+2] != b))
 471                 {
 472                     memcpy( target_data+i, source_data+i, 3 );
 473                 }
 474             }
 475             source_data += source_step;
 476             target_data += target_step;
 477         }
 478     }
 479 }
 480
 481 void wxImage::Replace( unsigned char r1, unsigned char g1, unsigned char b1,
 482                        unsigned char r2, unsigned char g2, unsigned char b2 )
 483 {
 484     wxCHECK_RET( Ok(), wxT("invalid image") );
 485
 486     char unsigned *data = GetData();
 487
 488     const int w = GetWidth();
 489     const int h = GetHeight();
 490
 491     for (int j = 0; j < h; j++)
 492         for (int i = 0; i < w; i++)
 493         {
 494             if ((data[0] == r1) && (data[1] == g1) && (data[2] == b1))
 495             {
 496                 data[0] = r2;
 497                 data[1] = g2;
 498                 data[2] = b2;
 499             }
 500             data += 3;
 501         }
 502 }
 503
 504 wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const
 505 {
 506     wxImage image;
 507
 508     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 509
 510     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height );
 511
 512     char unsigned *data = image.GetData();
 513
 514     wxCHECK_MSG( data, image, wxT("unable to create image") );
 515
 516     if (M_IMGDATA->m_hasMask)
 517     {
 518         if (M_IMGDATA->m_maskRed == r && M_IMGDATA->m_maskGreen == g &&
 519                                          M_IMGDATA->m_maskBlue == b)
 520             image.SetMaskColour( 255, 255, 255 );
 521         else
 522             image.SetMaskColour( 0, 0, 0 );
 523     }
 524
 525     long size = M_IMGDATA->m_height * M_IMGDATA->m_width;
 526
 527     char unsigned *srcd = M_IMGDATA->m_data;
 528     char unsigned *tard = image.GetData();
 529
 530     for ( long i = 0; i < size; i++, srcd += 3, tard += 3 )
 531     {
 532         if (srcd[0] == r && srcd[1] == g && srcd[2] == b)
 533             tard[0] = tard[1] = tard[2] = 255;
 534         else
 535             tard[0] = tard[1] = tard[2] = 0;
 536     }
 537
 538     return image;
 539 }
 540
 541 void wxImage::SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b )
 542 {
 543     wxCHECK_RET( Ok(), wxT("invalid image") );
 544
 545     int w = M_IMGDATA->m_width;
 546     int h = M_IMGDATA->m_height;
 547
 548     wxCHECK_RET( (x>=0) && (y>=0) && (x<w) && (y<h), wxT("invalid image index") );
 549
 550     long pos = (y * w + x) * 3;
 551
 552     M_IMGDATA->m_data[ pos   ] = r;
 553     M_IMGDATA->m_data[ pos+1 ] = g;
 554     M_IMGDATA->m_data[ pos+2 ] = b;
 555 }
 556
 557 unsigned char wxImage::GetRed( int x, int y ) const
 558 {
 559     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 560
 561     int w = M_IMGDATA->m_width;
 562     int h = M_IMGDATA->m_height;
 563
 564     wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
 565
 566     long pos = (y * w + x) * 3;
 567
 568     return M_IMGDATA->m_data[pos];
 569 }
 570
 571 unsigned char wxImage::GetGreen( int x, int y ) const
 572 {
 573     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 574
 575     int w = M_IMGDATA->m_width;
 576     int h = M_IMGDATA->m_height;
 577
 578     wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
 579
 580     long pos = (y * w + x) * 3;
 581
 582     return M_IMGDATA->m_data[pos+1];
 583 }
 584
 585 unsigned char wxImage::GetBlue( int x, int y ) const
 586 {
 587     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 588
 589     int w = M_IMGDATA->m_width;
 590     int h = M_IMGDATA->m_height;
 591
 592     wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
 593
 594     long pos = (y * w + x) * 3;
 595
 596     return M_IMGDATA->m_data[pos+2];
 597 }
 598
 599 bool wxImage::Ok() const
 600 {
 601     // image of 0 width or height can't be considered ok - at least because it
 602     // causes crashes in ConvertToBitmap() if we don't catch it in time
 603     wxImageRefData *data = M_IMGDATA;
 604     return data && data->m_ok && data->m_width && data->m_height;
 605 }
 606
 607 char unsigned *wxImage::GetData() const
 608 {
 609     wxCHECK_MSG( Ok(), (char unsigned *)NULL, wxT("invalid image") );
 610
 611     return M_IMGDATA->m_data;
 612 }
 613
 614 void wxImage::SetData( char unsigned *data )
 615 {
 616     wxCHECK_RET( Ok(), wxT("invalid image") );
 617
 618     wxImageRefData *newRefData = new wxImageRefData();
 619
 620     newRefData->m_width = M_IMGDATA->m_width;
 621     newRefData->m_height = M_IMGDATA->m_height;
 622     newRefData->m_data = data;
 623     newRefData->m_ok = TRUE;
 624     newRefData->m_maskRed = M_IMGDATA->m_maskRed;
 625     newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
 626     newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
 627     newRefData->m_hasMask = M_IMGDATA->m_hasMask;
 628
 629     UnRef();
 630
 631     m_refData = newRefData;
 632 }
 633
 634 void wxImage::SetData( char unsigned *data, int new_width, int new_height )
 635 {
 636     wxImageRefData *newRefData = new wxImageRefData();
 637
 638     if (m_refData)
 639     {
 640         newRefData->m_width = new_width;
 641         newRefData->m_height = new_height;
 642         newRefData->m_data = data;
 643         newRefData->m_ok = TRUE;
 644         newRefData->m_maskRed = M_IMGDATA->m_maskRed;
 645         newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
 646         newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
 647         newRefData->m_hasMask = M_IMGDATA->m_hasMask;
 648     }
 649     else
 650     {
 651         newRefData->m_width = new_width;
 652         newRefData->m_height = new_height;
 653         newRefData->m_data = data;
 654         newRefData->m_ok = TRUE;
 655     }
 656
 657     UnRef();
 658
 659     m_refData = newRefData;
 660 }
 661
 662 void wxImage::SetMaskColour( unsigned char r, unsigned char g, unsigned char b )
 663 {
 664     wxCHECK_RET( Ok(), wxT("invalid image") );
 665
 666     M_IMGDATA->m_maskRed = r;
 667     M_IMGDATA->m_maskGreen = g;
 668     M_IMGDATA->m_maskBlue = b;
 669     M_IMGDATA->m_hasMask = TRUE;
 670 }
 671
 672 unsigned char wxImage::GetMaskRed() const
 673 {
 674     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 675
 676     return M_IMGDATA->m_maskRed;
 677 }
 678
 679 unsigned char wxImage::GetMaskGreen() const
 680 {
 681     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 682
 683     return M_IMGDATA->m_maskGreen;
 684 }
 685
 686 unsigned char wxImage::GetMaskBlue() const
 687 {
 688     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 689
 690     return M_IMGDATA->m_maskBlue;
 691 }
 692
 693 void wxImage::SetMask( bool mask )
 694 {
 695     wxCHECK_RET( Ok(), wxT("invalid image") );
 696
 697     M_IMGDATA->m_hasMask = mask;
 698 }
 699
 700 bool wxImage::HasMask() const
 701 {
 702     wxCHECK_MSG( Ok(), FALSE, wxT("invalid image") );
 703
 704     return M_IMGDATA->m_hasMask;
 705 }
 706
 707 int wxImage::GetWidth() const
 708 {
 709     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 710
 711     return M_IMGDATA->m_width;
 712 }
 713
 714 int wxImage::GetHeight() const
 715 {
 716     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 717
 718     return M_IMGDATA->m_height;
 719 }
 720
 721 // Palette functions
 722
 723 bool wxImage::HasPalette() const
 724 {
 725     if (!Ok())
 726         return FALSE;
 727
 728     return M_IMGDATA->m_palette.Ok();
 729 }
 730
 731 const wxPalette& wxImage::GetPalette() const
 732 {
 733     wxCHECK_MSG( Ok(), wxNullPalette, wxT("invalid image") );
 734
 735     return M_IMGDATA->m_palette;
 736 }
 737
 738 void wxImage::SetPalette(const wxPalette& palette)
 739 {
 740     wxCHECK_RET( Ok(), wxT("invalid image") );
 741
 742     M_IMGDATA->m_palette = palette;
 743 }
 744
 745 // Option functions (arbitrary name/value mapping)
 746 void wxImage::SetOption(const wxString& name, const wxString& value)
 747 {
 748     wxCHECK_RET( Ok(), wxT("invalid image") );
 749
 750     int idx = M_IMGDATA->m_optionNames.Index(name, FALSE);
 751     if (idx == wxNOT_FOUND)
 752     {
 753         M_IMGDATA->m_optionNames.Add(name);
 754         M_IMGDATA->m_optionValues.Add(value);
 755     }
 756     else
 757     {
 758         M_IMGDATA->m_optionNames[idx] = name;
 759         M_IMGDATA->m_optionValues[idx] = value;
 760     }
 761 }
 762
 763 void wxImage::SetOption(const wxString& name, int value)
 764 {
 765     wxString valStr;
 766     valStr.Printf(wxT("%d"), value);
 767     SetOption(name, valStr);
 768 }
 769
 770 wxString wxImage::GetOption(const wxString& name) const
 771 {
 772     wxCHECK_MSG( Ok(), wxEmptyString, wxT("invalid image") );
 773
 774     int idx = M_IMGDATA->m_optionNames.Index(name, FALSE);
 775     if (idx == wxNOT_FOUND)
 776         return wxEmptyString;
 777     else
 778         return M_IMGDATA->m_optionValues[idx];
 779 }
 780
 781 int wxImage::GetOptionInt(const wxString& name) const
 782 {
 783     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 784
 785     return wxAtoi(GetOption(name));
 786 }
 787
 788 bool wxImage::HasOption(const wxString& name) const
 789 {
 790     wxCHECK_MSG( Ok(), FALSE, wxT("invalid image") );
 791
 792     return (M_IMGDATA->m_optionNames.Index(name, FALSE) != wxNOT_FOUND);
 793 }
 794
 795 bool wxImage::LoadFile( const wxString& filename, long type )
 796 {
 797 #if wxUSE_STREAMS
 798     if (wxFileExists(filename))
 799     {
 800         wxFileInputStream stream(filename);
 801         wxBufferedInputStream bstream( stream );
 802         return LoadFile(bstream, type);
 803     }
 804     else
 805     {
 806         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
 807
 808         return FALSE;
 809     }
 810 #else // !wxUSE_STREAMS
 811     return FALSE;
 812 #endif // wxUSE_STREAMS
 813 }
 814
 815 bool wxImage::LoadFile( const wxString& filename, const wxString& mimetype )
 816 {
 817 #if wxUSE_STREAMS
 818     if (wxFileExists(filename))
 819     {
 820         wxFileInputStream stream(filename);
 821         wxBufferedInputStream bstream( stream );
 822         return LoadFile(bstream, mimetype);
 823     }
 824     else
 825     {
 826         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
 827
 828         return FALSE;
 829     }
 830 #else // !wxUSE_STREAMS
 831     return FALSE;
 832 #endif // wxUSE_STREAMS
 833 }
 834
 835 bool wxImage::SaveFile( const wxString& filename, int type )
 836 {
 837 #if wxUSE_STREAMS
 838     wxFileOutputStream stream(filename);
 839
 840     if ( stream.LastError() == wxStream_NOERROR )
 841     {
 842         wxBufferedOutputStream bstream( stream );
 843         return SaveFile(bstream, type);
 844     }
 845 #endif // wxUSE_STREAMS
 846
 847     return FALSE;
 848 }
 849
 850 bool wxImage::SaveFile( const wxString& filename, const wxString& mimetype )
 851 {
 852 #if wxUSE_STREAMS
 853     wxFileOutputStream stream(filename);
 854
 855     if ( stream.LastError() == wxStream_NOERROR )
 856     {
 857         wxBufferedOutputStream bstream( stream );
 858         return SaveFile(bstream, mimetype);
 859     }
 860 #endif // wxUSE_STREAMS
 861
 862     return FALSE;
 863 }
 864
 865 bool wxImage::CanRead( const wxString &name )
 866 {
 867 #if wxUSE_STREAMS
 868   wxFileInputStream stream(name);
 869   return CanRead(stream);
 870 #else
 871   return FALSE;
 872 #endif
 873 }
 874
 875 #if wxUSE_STREAMS
 876
 877 bool wxImage::CanRead( wxInputStream &stream )
 878 {
 879   wxList &list=GetHandlers();
 880
 881   for ( wxList::Node *node = list.GetFirst(); node; node = node->GetNext() )
 882     {
 883       wxImageHandler *handler=(wxImageHandler*)node->GetData();
 884       if (handler->CanRead( stream ))
 885         return TRUE;
 886     }
 887
 888   return FALSE;
 889 }
 890
 891 bool wxImage::LoadFile( wxInputStream& stream, long type )
 892 {
 893     UnRef();
 894
 895     m_refData = new wxImageRefData;
 896
 897     wxImageHandler *handler;
 898
 899     if (type==wxBITMAP_TYPE_ANY)
 900     {
 901         wxList &list=GetHandlers();
 902
 903         for ( wxList::Node *node = list.GetFirst(); node; node = node->GetNext() )
 904         {
 905              handler=(wxImageHandler*)node->GetData();
 906              if (handler->CanRead( stream ))
 907                  return handler->LoadFile( this, stream );
 908
 909         }
 910
 911         wxLogWarning( _("No handler found for image type.") );
 912         return FALSE;
 913     }
 914
 915     handler = FindHandler(type);
 916
 917     if (handler == NULL)
 918     {
 919         wxLogWarning( _("No image handler for type %d defined."), type );
 920
 921         return FALSE;
 922     }
 923
 924     return handler->LoadFile( this, stream );
 925 }
 926
 927 bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype )
 928 {
 929     UnRef();
 930
 931     m_refData = new wxImageRefData;
 932
 933     wxImageHandler *handler = FindHandlerMime(mimetype);
 934
 935     if (handler == NULL)
 936     {
 937         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
 938
 939         return FALSE;
 940     }
 941
 942     return handler->LoadFile( this, stream );
 943 }
 944
 945 bool wxImage::SaveFile( wxOutputStream& stream, int type )
 946 {
 947     wxCHECK_MSG( Ok(), FALSE, wxT("invalid image") );
 948
 949     wxImageHandler *handler = FindHandler(type);
 950
 951     if (handler == NULL)
 952     {
 953         wxLogWarning( _("No image handler for type %d defined."), type );
 954
 955         return FALSE;
 956     }
 957
 958     return handler->SaveFile( this, stream );
 959 }
 960
 961 bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype )
 962 {
 963     wxCHECK_MSG( Ok(), FALSE, wxT("invalid image") );
 964
 965     wxImageHandler *handler = FindHandlerMime(mimetype);
 966
 967     if (handler == NULL)
 968     {
 969         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
 970
 971         return FALSE;
 972     }
 973
 974     return handler->SaveFile( this, stream );
 975 }
 976 #endif // wxUSE_STREAMS
 977
 978 void wxImage::AddHandler( wxImageHandler *handler )
 979 {
 980     // make sure that the memory will be freed at the program end
 981     sm_handlers.DeleteContents(TRUE);
 982
 983     sm_handlers.Append( handler );
 984 }
 985
 986 void wxImage::InsertHandler( wxImageHandler *handler )
 987 {
 988     // make sure that the memory will be freed at the program end
 989     sm_handlers.DeleteContents(TRUE);
 990
 991     sm_handlers.Insert( handler );
 992 }
 993
 994 bool wxImage::RemoveHandler( const wxString& name )
 995 {
 996     wxImageHandler *handler = FindHandler(name);
 997     if (handler)
 998     {
 999         sm_handlers.DeleteObject(handler);
1000         return TRUE;
1001     }
1002     else
1003         return FALSE;
1004 }
1005
1006 wxImageHandler *wxImage::FindHandler( const wxString& name )
1007 {
1008     wxNode *node = sm_handlers.First();
1009     while (node)
1010     {
1011         wxImageHandler *handler = (wxImageHandler*)node->Data();
1012         if (handler->GetName().Cmp(name) == 0) return handler;
1013
1014         node = node->Next();
1015     }
1016     return (wxImageHandler *)NULL;
1017 }
1018
1019 wxImageHandler *wxImage::FindHandler( const wxString& extension, long bitmapType )
1020 {
1021     wxNode *node = sm_handlers.First();
1022     while (node)
1023     {
1024         wxImageHandler *handler = (wxImageHandler*)node->Data();
1025         if ( (handler->GetExtension().Cmp(extension) == 0) &&
1026             (bitmapType == -1 || handler->GetType() == bitmapType) )
1027             return handler;
1028         node = node->Next();
1029     }
1030     return (wxImageHandler*)NULL;
1031 }
1032
1033 wxImageHandler *wxImage::FindHandler( long bitmapType )
1034 {
1035     wxNode *node = sm_handlers.First();
1036     while (node)
1037     {
1038         wxImageHandler *handler = (wxImageHandler *)node->Data();
1039         if (handler->GetType() == bitmapType) return handler;
1040         node = node->Next();
1041     }
1042     return NULL;
1043 }
1044
1045 wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype )
1046 {
1047     wxNode *node = sm_handlers.First();
1048     while (node)
1049     {
1050         wxImageHandler *handler = (wxImageHandler *)node->Data();
1051         if (handler->GetMimeType().IsSameAs(mimetype, FALSE)) return handler;
1052         node = node->Next();
1053     }
1054     return NULL;
1055 }
1056
1057 void wxImage::InitStandardHandlers()
1058 {
1059     AddHandler(new wxBMPHandler);
1060 #if wxUSE_XPM && !defined(__WXGTK__) && !defined(__WXMOTIF__)
1061     AddHandler(new wxXPMHandler);
1062 #endif
1063 }
1064
1065 void wxImage::CleanUpHandlers()
1066 {
1067     wxNode *node = sm_handlers.First();
1068     while (node)
1069     {
1070         wxImageHandler *handler = (wxImageHandler *)node->Data();
1071         wxNode *next = node->Next();
1072         delete handler;
1073         delete node;
1074         node = next;
1075     }
1076 }
1077
1078 //-----------------------------------------------------------------------------
1079 // wxImageHandler
1080 //-----------------------------------------------------------------------------
1081
1082 IMPLEMENT_ABSTRACT_CLASS(wxImageHandler,wxObject)
1083
1084 #if wxUSE_STREAMS
1085 bool wxImageHandler::LoadFile( wxImage *WXUNUSED(image), wxInputStream& WXUNUSED(stream), bool WXUNUSED(verbose), int WXUNUSED(index) )
1086 {
1087     return FALSE;
1088 }
1089
1090 bool wxImageHandler::SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream), bool WXUNUSED(verbose) )
1091 {
1092     return FALSE;
1093 }
1094
1095 int wxImageHandler::GetImageCount( wxInputStream& WXUNUSED(stream) )
1096 {
1097     return 1;
1098 }
1099
1100 bool wxImageHandler::CanRead( const wxString& name )
1101 {
1102     if (wxFileExists(name))
1103     {
1104         wxFileInputStream stream(name);
1105         return CanRead(stream);
1106     }
1107
1108     else {
1109         wxLogError( _("Can't check image format of file '%s': file does not exist."), name.c_str() );
1110
1111         return FALSE;
1112     }
1113 //    return FALSE;
1114 }
1115
1116 #endif // wxUSE_STREAMS
1117
1118
1119
1120 //-----------------------------------------------------------------------------
1121 // wxBitmap convertion routines
1122 //-----------------------------------------------------------------------------
1123
1124 #if wxUSE_GUI
1125
1126 #ifdef __WXGTK__
1127 wxBitmap wxImage::ConvertToMonoBitmap( unsigned char red, unsigned char green, unsigned char blue ) const
1128 {
1129     wxImage mono = this->ConvertToMono( red, green, blue );
1130     wxBitmap bitmap( mono, 1 );
1131     return bitmap;
1132 }
1133 #endif
1134
1135 wxBitmap wxImage::ConvertToBitmap() const
1136 {
1137     wxBitmap bitmap( *this );
1138     return bitmap;
1139 }
1140
1141 wxImage::wxImage( const wxBitmap &bitmap )
1142 {
1143     *this = bitmap.ConvertToImage();
1144 }
1145
1146 #endif
1147
1148
1149
1150 // A module to allow wxImage initialization/cleanup
1151 // without calling these functions from app.cpp or from
1152 // the user's application.
1153
1154 class wxImageModule: public wxModule
1155 {
1156 DECLARE_DYNAMIC_CLASS(wxImageModule)
1157 public:
1158     wxImageModule() {}
1159     bool OnInit() { wxImage::InitStandardHandlers(); return TRUE; };
1160     void OnExit() { wxImage::CleanUpHandlers(); };
1161 };
1162
1163 IMPLEMENT_DYNAMIC_CLASS(wxImageModule, wxModule)
1164
1165
1166 //-----------------------------------------------------------------------------
1167
1168 // GRG, Dic/99
1169 // Counts and returns the number of different colours. Optionally stops
1170 // when it exceeds 'stopafter' different colours. This is useful, for
1171 // example, to see if the image can be saved as 8-bit (256 colour or
1172 // less, in this case it would be invoked as CountColours(256)). Default
1173 // value for stopafter is -1 (don't care).
1174 //
1175 unsigned long wxImage::CountColours( unsigned long stopafter )
1176 {
1177     wxHashTable h;
1178     wxObject dummy;
1179     unsigned char r, g, b;
1180     unsigned char *p;
1181     unsigned long size, nentries, key;
1182
1183     p = GetData();
1184     size = GetWidth() * GetHeight();
1185     nentries = 0;
1186
1187     for (unsigned long j = 0; (j < size) && (nentries <= stopafter) ; j++)
1188     {
1189         r = *(p++);
1190         g = *(p++);
1191         b = *(p++);
1192         key = (r << 16) | (g << 8) | b;
1193
1194         if (h.Get(key) == NULL)
1195         {
1196             h.Put(key, &dummy);
1197             nentries++;
1198         }
1199     }
1200
1201     return nentries;
1202 }
1203
1204
1205 // GRG, Dic/99
1206 // Computes the histogram of the image and fills a hash table, indexed
1207 // with integer keys built as 0xRRGGBB, containing wxHNode objects. Each
1208 // wxHNode contains an 'index' (useful to build a palette with the image
1209 // colours) and a 'value', which is the number of pixels in the image with
1210 // that colour.
1211 //
1212 unsigned long wxImage::ComputeHistogram( wxHashTable &h )
1213 {
1214     unsigned char r, g, b;
1215     unsigned char *p;
1216     unsigned long size, nentries, key;
1217     wxHNode *hnode;
1218
1219     p = GetData();
1220     size = GetWidth() * GetHeight();
1221     nentries = 0;
1222
1223     for (unsigned long j = 0; j < size; j++)
1224     {
1225         r = *(p++);
1226         g = *(p++);
1227         b = *(p++);
1228         key = (r << 16) | (g << 8) | b;
1229
1230         hnode = (wxHNode *) h.Get(key);
1231
1232         if (hnode)
1233             hnode->value++;
1234         else
1235         {
1236             hnode = new wxHNode();
1237             hnode->index = nentries++;
1238             hnode->value = 1;
1239
1240             h.Put(key, (wxObject *)hnode);
1241         }
1242     }
1243
1244     return nentries;
1245 }
1246
1247 /*
1248  * Rotation code by Carlos Moreno
1249  */
1250
1251 // GRG: I've removed wxRotationPoint - we already have wxRealPoint which
1252 //      does exactly the same thing. And I also got rid of wxRotationPixel
1253 //      bacause of potential problems in architectures where alignment
1254 //      is an issue, so I had to rewrite parts of the code.
1255
1256 static const double gs_Epsilon = 1e-10;
1257
1258 static inline int wxCint (double x)
1259 {
1260     return (x > 0) ? (int) (x + 0.5) : (int) (x - 0.5);
1261 }
1262
1263
1264 // Auxiliary function to rotate a point (x,y) with respect to point p0
1265 // make it inline and use a straight return to facilitate optimization
1266 // also, the function receives the sine and cosine of the angle to avoid
1267 // repeating the time-consuming calls to these functions -- sin/cos can
1268 // be computed and stored in the calling function.
1269
1270 inline wxRealPoint rotated_point (const wxRealPoint & p, double cos_angle, double sin_angle, const wxRealPoint & p0)
1271 {
1272     return wxRealPoint (p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle,
1273                         p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle);
1274 }
1275
1276 inline wxRealPoint rotated_point (double x, double y, double cos_angle, double sin_angle, const wxRealPoint & p0)
1277 {
1278     return rotated_point (wxRealPoint(x,y), cos_angle, sin_angle, p0);
1279 }
1280
1281 wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool interpolating, wxPoint * offset_after_rotation) const
1282 {
1283     int i;
1284     angle = -angle;     // screen coordinates are a mirror image of "real" coordinates
1285
1286     // Create pointer-based array to accelerate access to wxImage's data
1287     unsigned char ** data = new unsigned char * [GetHeight()];
1288
1289     data[0] = GetData();
1290
1291     for (i = 1; i < GetHeight(); i++)
1292         data[i] = data[i - 1] + (3 * GetWidth());
1293
1294     // precompute coefficients for rotation formula
1295     // (sine and cosine of the angle)
1296     const double cos_angle = cos(angle);
1297     const double sin_angle = sin(angle);
1298
1299     // Create new Image to store the result
1300     // First, find rectangle that covers the rotated image;  to do that,
1301     // rotate the four corners
1302
1303     const wxRealPoint p0(centre_of_rotation.x, centre_of_rotation.y);
1304
1305     wxRealPoint p1 = rotated_point (0, 0, cos_angle, sin_angle, p0);
1306     wxRealPoint p2 = rotated_point (0, GetHeight(), cos_angle, sin_angle, p0);
1307     wxRealPoint p3 = rotated_point (GetWidth(), 0, cos_angle, sin_angle, p0);
1308     wxRealPoint p4 = rotated_point (GetWidth(), GetHeight(), cos_angle, sin_angle, p0);
1309
1310     int x1 = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x)));
1311     int y1 = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y)));
1312     int x2 = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x)));
1313     int y2 = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y)));
1314
1315     wxImage rotated (x2 - x1 + 1, y2 - y1 + 1);
1316
1317     if (offset_after_rotation != NULL)
1318     {
1319         *offset_after_rotation = wxPoint (x1, y1);
1320     }
1321
1322     // GRG: The rotated (destination) image is always accessed
1323     //      sequentially, so there is no need for a pointer-based
1324     //      array here (and in fact it would be slower).
1325     //
1326     unsigned char * dst = rotated.GetData();
1327
1328     // GRG: if the original image has a mask, use its RGB values
1329     //      as the blank pixel, else, fall back to default (black).
1330     //
1331     unsigned char blank_r = 0;
1332     unsigned char blank_g = 0;
1333     unsigned char blank_b = 0;
1334
1335     if (HasMask())
1336     {
1337         blank_r = GetMaskRed();
1338         blank_g = GetMaskGreen();
1339         blank_b = GetMaskBlue();
1340         rotated.SetMaskColour( blank_r, blank_g, blank_b );
1341     }
1342
1343     // Now, for each point of the rotated image, find where it came from, by
1344     // performing an inverse rotation (a rotation of -angle) and getting the
1345     // pixel at those coordinates
1346
1347     // GRG: I've taken the (interpolating) test out of the loops, so that
1348     //      it is done only once, instead of repeating it for each pixel.
1349
1350     int x;
1351     if (interpolating)
1352     {
1353         for (int y = 0; y < rotated.GetHeight(); y++)
1354         {
1355             for (x = 0; x < rotated.GetWidth(); x++)
1356             {
1357                 wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
1358
1359                 if (-0.25 < src.x && src.x < GetWidth() - 0.75 &&
1360                     -0.25 < src.y && src.y < GetHeight() - 0.75)
1361                 {
1362                     // interpolate using the 4 enclosing grid-points.  Those
1363                     // points can be obtained using floor and ceiling of the
1364                     // exact coordinates of the point
1365                         // C.M. 2000-02-17:  when the point is near the border, special care is required.
1366
1367                     int x1, y1, x2, y2;
1368
1369                     if (0 < src.x && src.x < GetWidth() - 1)
1370                     {
1371                         x1 = wxCint(floor(src.x));
1372                         x2 = wxCint(ceil(src.x));
1373                     }
1374                     else    // else means that x is near one of the borders (0 or width-1)
1375                     {
1376                         x1 = x2 = wxCint (src.x);
1377                     }
1378
1379                     if (0 < src.y && src.y < GetHeight() - 1)
1380                     {
1381                         y1 = wxCint(floor(src.y));
1382                         y2 = wxCint(ceil(src.y));
1383                     }
1384                     else
1385                     {
1386                         y1 = y2 = wxCint (src.y);
1387                     }
1388
1389                     // get four points and the distances (square of the distance,
1390                     // for efficiency reasons) for the interpolation formula
1391
1392                     // GRG: Do not calculate the points until they are
1393                     //      really needed -- this way we can calculate
1394                     //      just one, instead of four, if d1, d2, d3
1395                     //      or d4 are < gs_Epsilon
1396
1397                     const double d1 = (src.x - x1) * (src.x - x1) + (src.y - y1) * (src.y - y1);
1398                     const double d2 = (src.x - x2) * (src.x - x2) + (src.y - y1) * (src.y - y1);
1399                     const double d3 = (src.x - x2) * (src.x - x2) + (src.y - y2) * (src.y - y2);
1400                     const double d4 = (src.x - x1) * (src.x - x1) + (src.y - y2) * (src.y - y2);
1401
1402                     // Now interpolate as a weighted average of the four surrounding
1403                     // points, where the weights are the distances to each of those points
1404
1405                     // If the point is exactly at one point of the grid of the source
1406                     // image, then don't interpolate -- just assign the pixel
1407
1408                     if (d1 < gs_Epsilon)        // d1,d2,d3,d4 are positive -- no need for abs()
1409                     {
1410                         unsigned char *p = data[y1] + (3 * x1);
1411                         *(dst++) = *(p++);
1412                         *(dst++) = *(p++);
1413                         *(dst++) = *(p++);
1414                     }
1415                     else if (d2 < gs_Epsilon)
1416                     {
1417                         unsigned char *p = data[y1] + (3 * x2);
1418                         *(dst++) = *(p++);
1419                         *(dst++) = *(p++);
1420                         *(dst++) = *(p++);
1421                     }
1422                     else if (d3 < gs_Epsilon)
1423                     {
1424                         unsigned char *p = data[y2] + (3 * x2);
1425                         *(dst++) = *(p++);
1426                         *(dst++) = *(p++);
1427                         *(dst++) = *(p++);
1428                     }
1429                     else if (d4 < gs_Epsilon)
1430                     {
1431                         unsigned char *p = data[y2] + (3 * x1);
1432                         *(dst++) = *(p++);
1433                         *(dst++) = *(p++);
1434                         *(dst++) = *(p++);
1435                     }
1436                     else
1437                     {
1438                         // weights for the weighted average are proportional to the inverse of the distance
1439                         unsigned char *v1 = data[y1] + (3 * x1);
1440                         unsigned char *v2 = data[y1] + (3 * x2);
1441                         unsigned char *v3 = data[y2] + (3 * x2);
1442                         unsigned char *v4 = data[y2] + (3 * x1);
1443
1444                         const double w1 = 1/d1, w2 = 1/d2, w3 = 1/d3, w4 = 1/d4;
1445
1446                         // GRG: Unrolled.
1447
1448                         *(dst++) = (unsigned char)
1449                             ( (w1 * *(v1++) + w2 * *(v2++) +
1450                                w3 * *(v3++) + w4 * *(v4++)) /
1451                               (w1 + w2 + w3 + w4) );
1452                         *(dst++) = (unsigned char)
1453                             ( (w1 * *(v1++) + w2 * *(v2++) +
1454                                w3 * *(v3++) + w4 * *(v4++)) /
1455                               (w1 + w2 + w3 + w4) );
1456                         *(dst++) = (unsigned char)
1457                             ( (w1 * *(v1++) + w2 * *(v2++) +
1458                                w3 * *(v3++) + w4 * *(v4++)) /
1459                               (w1 + w2 + w3 + w4) );
1460                     }
1461                 }
1462                 else
1463                 {
1464                     *(dst++) = blank_r;
1465                     *(dst++) = blank_g;
1466                     *(dst++) = blank_b;
1467                 }
1468             }
1469         }
1470     }
1471     else    // not interpolating
1472     {
1473         for (int y = 0; y < rotated.GetHeight(); y++)
1474         {
1475             for (x = 0; x < rotated.GetWidth(); x++)
1476             {
1477                 wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
1478
1479                 const int xs = wxCint (src.x);      // wxCint rounds to the
1480                 const int ys = wxCint (src.y);      // closest integer
1481
1482                 if (0 <= xs && xs < GetWidth() &&
1483                     0 <= ys && ys < GetHeight())
1484                 {
1485                     unsigned char *p = data[ys] + (3 * xs);
1486                     *(dst++) = *(p++);
1487                     *(dst++) = *(p++);
1488                     *(dst++) = *(p++);
1489                 }
1490                 else
1491                 {
1492                     *(dst++) = blank_r;
1493                     *(dst++) = blank_g;
1494                     *(dst++) = blank_b;
1495                 }
1496             }
1497         }
1498     }
1499
1500     delete [] data;
1501
1502     return rotated;
1503 }
1504
1505 #endif // wxUSE_IMAGE