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