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 #if wxUSE_PALETTE
  62     wxPalette       m_palette;
  63 #endif // wxUSE_PALETTE
  64     wxArrayString   m_optionNames;
  65     wxArrayString   m_optionValues;
  66 };
  67
  68 wxImageRefData::wxImageRefData()
  69 {
  70     m_width = 0;
  71     m_height = 0;
  72     m_data = (unsigned char*) NULL;
  73     m_ok = FALSE;
  74     m_maskRed = 0;
  75     m_maskGreen = 0;
  76     m_maskBlue = 0;
  77     m_hasMask = FALSE;
  78     m_static = FALSE;
  79 }
  80
  81 wxImageRefData::~wxImageRefData()
  82 {
  83     if (m_data && !m_static)
  84         free( m_data );
  85 }
  86
  87 wxList wxImage::sm_handlers;
  88
  89 wxImage wxNullImage;
  90
  91 //-----------------------------------------------------------------------------
  92
  93 #define M_IMGDATA ((wxImageRefData *)m_refData)
  94
  95 IMPLEMENT_DYNAMIC_CLASS(wxImage, wxObject)
  96
  97 wxImage::wxImage()
  98 {
  99 }
 100
 101 wxImage::wxImage( int width, int height )
 102 {
 103     Create( width, height );
 104 }
 105
 106 wxImage::wxImage( int width, int height, unsigned char* data, bool static_data )
 107 {
 108     Create( width, height, data, static_data );
 109 }
 110
 111 wxImage::wxImage( const wxString& name, long type )
 112 {
 113     LoadFile( name, type );
 114 }
 115
 116 wxImage::wxImage( const wxString& name, const wxString& mimetype )
 117 {
 118     LoadFile( name, mimetype );
 119 }
 120
 121 #if wxUSE_STREAMS
 122 wxImage::wxImage( wxInputStream& stream, long type )
 123 {
 124     LoadFile( stream, type );
 125 }
 126
 127 wxImage::wxImage( wxInputStream& stream, const wxString& mimetype )
 128 {
 129     LoadFile( stream, mimetype );
 130 }
 131 #endif // wxUSE_STREAMS
 132
 133 wxImage::wxImage( const wxImage& image )
 134 {
 135     Ref(image);
 136 }
 137
 138 wxImage::wxImage( const wxImage* image )
 139 {
 140     if (image) Ref(*image);
 141 }
 142
 143 void wxImage::Create( int width, int height )
 144 {
 145     UnRef();
 146
 147     m_refData = new wxImageRefData();
 148
 149     M_IMGDATA->m_data = (unsigned char *) malloc( width*height*3 );
 150     if (M_IMGDATA->m_data)
 151     {
 152         for (int l = 0; l < width*height*3; l++) M_IMGDATA->m_data[l] = 0;
 153
 154         M_IMGDATA->m_width = width;
 155         M_IMGDATA->m_height = height;
 156         M_IMGDATA->m_ok = TRUE;
 157     }
 158     else
 159     {
 160         UnRef();
 161     }
 162 }
 163
 164 void wxImage::Create( int width, int height, unsigned char* data, bool static_data )
 165 {
 166     UnRef();
 167
 168     m_refData = new wxImageRefData();
 169
 170     M_IMGDATA->m_data = data;
 171     if (M_IMGDATA->m_data)
 172     {
 173         M_IMGDATA->m_width = width;
 174         M_IMGDATA->m_height = height;
 175         M_IMGDATA->m_ok = TRUE;
 176         M_IMGDATA->m_static = static_data;
 177     }
 178     else
 179     {
 180         UnRef();
 181     }
 182 }
 183
 184 void wxImage::Destroy()
 185 {
 186     UnRef();
 187 }
 188
 189 wxImage wxImage::Copy() const
 190 {
 191     wxImage image;
 192
 193     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 194
 195     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height );
 196
 197     char unsigned *data = image.GetData();
 198
 199     wxCHECK_MSG( data, image, wxT("unable to create image") );
 200
 201     if (M_IMGDATA->m_hasMask)
 202         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 203
 204     memcpy( data, GetData(), M_IMGDATA->m_width*M_IMGDATA->m_height*3 );
 205
 206     return image;
 207 }
 208
 209 wxImage wxImage::Scale( int width, int height ) const
 210 {
 211     wxImage image;
 212
 213     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 214
 215     // can't scale to/from 0 size
 216     wxCHECK_MSG( (width > 0) && (height > 0), image,
 217                  wxT("invalid new image size") );
 218
 219     long old_height = M_IMGDATA->m_height,
 220          old_width  = M_IMGDATA->m_width;
 221     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 222                  wxT("invalid old image size") );
 223
 224     image.Create( width, height );
 225
 226     char unsigned *data = image.GetData();
 227
 228     wxCHECK_MSG( data, image, wxT("unable to create image") );
 229
 230     if (M_IMGDATA->m_hasMask)
 231     {
 232         image.SetMaskColour( M_IMGDATA->m_maskRed,
 233                              M_IMGDATA->m_maskGreen,
 234                              M_IMGDATA->m_maskBlue );
 235     }
 236
 237     char unsigned *source_data = M_IMGDATA->m_data;
 238     char unsigned *target_data = data;
 239
 240 #if 0
 241     // This is nonsense, RR.
 242
 243     // We do (x, y) -> (x, y)*oldSize/newSize but the valid values of x and y
 244     // are from 0 to size-1, hence all decrement the sizes
 245     long old_old_width = old_width;
 246     old_height--;
 247     old_width--;
 248     height--;
 249     width--;
 250     for ( long j = 0; j <= height; j++ )
 251     {
 252         // don't crash for images with height == 1
 253         long y_offset = height ? (j * old_height / height)* old_old_width : 0;
 254
 255         for ( long i = 0; i <= width; i++ )
 256         {
 257             long x_offset = width ? (i * old_width) / width : 0;
 258
 259             memcpy( target_data, source_data + 3*(y_offset + x_offset), 3 );
 260             target_data += 3;
 261         }
 262     }
 263 #else
 264     for (long j = 0; j < height; j++)
 265     {
 266         long y_offset = (j * old_height / height) * old_width;
 267
 268         for (long i = 0; i < width; i++)
 269         {
 270             memcpy( target_data,
 271                 source_data + 3*(y_offset + ((i * old_width )/ width)),
 272                 3 );
 273             target_data += 3;
 274         }
 275     }
 276 #endif
 277
 278     return image;
 279 }
 280
 281 wxImage wxImage::Rotate90( bool clockwise ) const
 282 {
 283     wxImage image;
 284
 285     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 286
 287     image.Create( M_IMGDATA->m_height, M_IMGDATA->m_width );
 288
 289     char unsigned *data = image.GetData();
 290
 291     wxCHECK_MSG( data, image, wxT("unable to create image") );
 292
 293     if (M_IMGDATA->m_hasMask)
 294         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 295
 296     long height = M_IMGDATA->m_height;
 297     long width  = M_IMGDATA->m_width;
 298
 299     char unsigned *source_data = M_IMGDATA->m_data;
 300     char unsigned *target_data;
 301
 302     for (long j = 0; j < height; j++)
 303     {
 304         for (long i = 0; i < width; i++)
 305         {
 306             if (clockwise)
 307                 target_data = data + (((i+1)*height) - j - 1)*3;
 308             else
 309                 target_data = data + ((height*(width-1)) + j - (i*height))*3;
 310             memcpy( target_data, source_data, 3 );
 311             source_data += 3;
 312         }
 313     }
 314
 315     return image;
 316 }
 317
 318 wxImage wxImage::Mirror( bool horizontally ) const
 319 {
 320     wxImage image;
 321
 322     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 323
 324     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height );
 325
 326     char unsigned *data = image.GetData();
 327
 328     wxCHECK_MSG( data, image, wxT("unable to create image") );
 329
 330     if (M_IMGDATA->m_hasMask)
 331         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 332
 333     long height = M_IMGDATA->m_height;
 334     long width  = M_IMGDATA->m_width;
 335
 336     char unsigned *source_data = M_IMGDATA->m_data;
 337     char unsigned *target_data;
 338
 339     if (horizontally)
 340     {
 341         for (long j = 0; j < height; j++)
 342         {
 343             data += width*3;
 344             target_data = data-3;
 345             for (long i = 0; i < width; i++)
 346             {
 347                 memcpy( target_data, source_data, 3 );
 348                 source_data += 3;
 349                 target_data -= 3;
 350             }
 351         }
 352     }
 353     else
 354     {
 355         for (long i = 0; i < height; i++)
 356         {
 357             target_data = data + 3*width*(height-1-i);
 358             memcpy( target_data, source_data, (size_t)3*width );
 359             source_data += 3*width;
 360         }
 361     }
 362
 363     return image;
 364 }
 365
 366 wxImage wxImage::GetSubImage( const wxRect &rect ) const
 367 {
 368     wxImage image;
 369
 370     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 371
 372     wxCHECK_MSG( (rect.GetLeft()>=0) && (rect.GetTop()>=0) && (rect.GetRight()<=GetWidth()) && (rect.GetBottom()<=GetHeight()),
 373                  image, wxT("invalid subimage size") );
 374
 375     int subwidth=rect.GetWidth();
 376     const int subheight=rect.GetHeight();
 377
 378     image.Create( subwidth, subheight );
 379
 380     char unsigned *subdata = image.GetData(), *data=GetData();
 381
 382     wxCHECK_MSG( subdata, image, wxT("unable to create image") );
 383
 384     if (M_IMGDATA->m_hasMask)
 385         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 386
 387     const int subleft=3*rect.GetLeft();
 388     const int width=3*GetWidth();
 389     subwidth*=3;
 390
 391     data+=rect.GetTop()*width+subleft;
 392
 393     for (long j = 0; j < subheight; ++j)
 394     {
 395         memcpy( subdata, data, subwidth);
 396         subdata+=subwidth;
 397         data+=width;
 398     }
 399
 400     return image;
 401 }
 402
 403 void wxImage::Paste( const wxImage &image, int x, int y )
 404 {
 405     wxCHECK_RET( Ok(), wxT("invalid image") );
 406     wxCHECK_RET( image.Ok(), wxT("invalid image") );
 407
 408     int xx = 0;
 409     int yy = 0;
 410     int width = image.GetWidth();
 411     int height = image.GetHeight();
 412
 413     if (x < 0)
 414     {
 415         xx = -x;
 416         width += x;
 417     }
 418     if (y < 0)
 419     {
 420         yy = -y;
 421         height += y;
 422     }
 423
 424     if ((x+xx)+width > M_IMGDATA->m_width)
 425         width = M_IMGDATA->m_width - (x+xx);
 426     if ((y+yy)+height > M_IMGDATA->m_height)
 427         height = M_IMGDATA->m_height - (y+yy);
 428
 429     if (width < 1) return;
 430     if (height < 1) return;
 431
 432     if ((!HasMask() && !image.HasMask()) ||
 433        ((HasMask() && image.HasMask() &&
 434          (GetMaskRed()==image.GetMaskRed()) &&
 435          (GetMaskGreen()==image.GetMaskGreen()) &&
 436          (GetMaskBlue()==image.GetMaskBlue()))))
 437     {
 438         width *= 3;
 439         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 440         int source_step = image.GetWidth()*3;
 441
 442         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 443         int target_step = M_IMGDATA->m_width*3;
 444         for (int j = 0; j < height; j++)
 445         {
 446             memcpy( target_data, source_data, width );
 447             source_data += source_step;
 448             target_data += target_step;
 449         }
 450         return;
 451     }
 452
 453     if (!HasMask() && image.HasMask())
 454     {
 455         unsigned char r = image.GetMaskRed();
 456         unsigned char g = image.GetMaskGreen();
 457         unsigned char b = image.GetMaskBlue();
 458
 459         width *= 3;
 460         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 461         int source_step = image.GetWidth()*3;
 462
 463         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 464         int target_step = M_IMGDATA->m_width*3;
 465
 466         for (int j = 0; j < height; j++)
 467         {
 468             for (int i = 0; i < width; i+=3)
 469             {
 470                 if ((source_data[i]   != r) &&
 471                     (source_data[i+1] != g) &&
 472                     (source_data[i+2] != b))
 473                 {
 474                     memcpy( target_data+i, source_data+i, 3 );
 475                 }
 476             }
 477             source_data += source_step;
 478             target_data += target_step;
 479         }
 480     }
 481 }
 482
 483 void wxImage::Replace( unsigned char r1, unsigned char g1, unsigned char b1,
 484                        unsigned char r2, unsigned char g2, unsigned char b2 )
 485 {
 486     wxCHECK_RET( Ok(), wxT("invalid image") );
 487
 488     char unsigned *data = GetData();
 489
 490     const int w = GetWidth();
 491     const int h = GetHeight();
 492
 493     for (int j = 0; j < h; j++)
 494         for (int i = 0; i < w; i++)
 495         {
 496             if ((data[0] == r1) && (data[1] == g1) && (data[2] == b1))
 497             {
 498                 data[0] = r2;
 499                 data[1] = g2;
 500                 data[2] = b2;
 501             }
 502             data += 3;
 503         }
 504 }
 505
 506 wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const
 507 {
 508     wxImage image;
 509
 510     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 511
 512     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height );
 513
 514     char unsigned *data = image.GetData();
 515
 516     wxCHECK_MSG( data, image, wxT("unable to create image") );
 517
 518     if (M_IMGDATA->m_hasMask)
 519     {
 520         if (M_IMGDATA->m_maskRed == r && M_IMGDATA->m_maskGreen == g &&
 521                                          M_IMGDATA->m_maskBlue == b)
 522             image.SetMaskColour( 255, 255, 255 );
 523         else
 524             image.SetMaskColour( 0, 0, 0 );
 525     }
 526
 527     long size = M_IMGDATA->m_height * M_IMGDATA->m_width;
 528
 529     char unsigned *srcd = M_IMGDATA->m_data;
 530     char unsigned *tard = image.GetData();
 531
 532     for ( long i = 0; i < size; i++, srcd += 3, tard += 3 )
 533     {
 534         if (srcd[0] == r && srcd[1] == g && srcd[2] == b)
 535             tard[0] = tard[1] = tard[2] = 255;
 536         else
 537             tard[0] = tard[1] = tard[2] = 0;
 538     }
 539
 540     return image;
 541 }
 542
 543 void wxImage::SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b )
 544 {
 545     wxCHECK_RET( Ok(), wxT("invalid image") );
 546
 547     int w = M_IMGDATA->m_width;
 548     int h = M_IMGDATA->m_height;
 549
 550     wxCHECK_RET( (x>=0) && (y>=0) && (x<w) && (y<h), wxT("invalid image index") );
 551
 552     long pos = (y * w + x) * 3;
 553
 554     M_IMGDATA->m_data[ pos   ] = r;
 555     M_IMGDATA->m_data[ pos+1 ] = g;
 556     M_IMGDATA->m_data[ pos+2 ] = b;
 557 }
 558
 559 unsigned char wxImage::GetRed( int x, int y ) const
 560 {
 561     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 562
 563     int w = M_IMGDATA->m_width;
 564     int h = M_IMGDATA->m_height;
 565
 566     wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
 567
 568     long pos = (y * w + x) * 3;
 569
 570     return M_IMGDATA->m_data[pos];
 571 }
 572
 573 unsigned char wxImage::GetGreen( int x, int y ) const
 574 {
 575     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 576
 577     int w = M_IMGDATA->m_width;
 578     int h = M_IMGDATA->m_height;
 579
 580     wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
 581
 582     long pos = (y * w + x) * 3;
 583
 584     return M_IMGDATA->m_data[pos+1];
 585 }
 586
 587 unsigned char wxImage::GetBlue( int x, int y ) const
 588 {
 589     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 590
 591     int w = M_IMGDATA->m_width;
 592     int h = M_IMGDATA->m_height;
 593
 594     wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
 595
 596     long pos = (y * w + x) * 3;
 597
 598     return M_IMGDATA->m_data[pos+2];
 599 }
 600
 601 bool wxImage::Ok() const
 602 {
 603     // image of 0 width or height can't be considered ok - at least because it
 604     // causes crashes in ConvertToBitmap() if we don't catch it in time
 605     wxImageRefData *data = M_IMGDATA;
 606     return data && data->m_ok && data->m_width && data->m_height;
 607 }
 608
 609 char unsigned *wxImage::GetData() const
 610 {
 611     wxCHECK_MSG( Ok(), (char unsigned *)NULL, wxT("invalid image") );
 612
 613     return M_IMGDATA->m_data;
 614 }
 615
 616 void wxImage::SetData( char unsigned *data )
 617 {
 618     wxCHECK_RET( Ok(), wxT("invalid image") );
 619
 620     wxImageRefData *newRefData = new wxImageRefData();
 621
 622     newRefData->m_width = M_IMGDATA->m_width;
 623     newRefData->m_height = M_IMGDATA->m_height;
 624     newRefData->m_data = data;
 625     newRefData->m_ok = TRUE;
 626     newRefData->m_maskRed = M_IMGDATA->m_maskRed;
 627     newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
 628     newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
 629     newRefData->m_hasMask = M_IMGDATA->m_hasMask;
 630
 631     UnRef();
 632
 633     m_refData = newRefData;
 634 }
 635
 636 void wxImage::SetData( char unsigned *data, int new_width, int new_height )
 637 {
 638     wxImageRefData *newRefData = new wxImageRefData();
 639
 640     if (m_refData)
 641     {
 642         newRefData->m_width = new_width;
 643         newRefData->m_height = new_height;
 644         newRefData->m_data = data;
 645         newRefData->m_ok = TRUE;
 646         newRefData->m_maskRed = M_IMGDATA->m_maskRed;
 647         newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
 648         newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
 649         newRefData->m_hasMask = M_IMGDATA->m_hasMask;
 650     }
 651     else
 652     {
 653         newRefData->m_width = new_width;
 654         newRefData->m_height = new_height;
 655         newRefData->m_data = data;
 656         newRefData->m_ok = TRUE;
 657     }
 658
 659     UnRef();
 660
 661     m_refData = newRefData;
 662 }
 663
 664 void wxImage::SetMaskColour( unsigned char r, unsigned char g, unsigned char b )
 665 {
 666     wxCHECK_RET( Ok(), wxT("invalid image") );
 667
 668     M_IMGDATA->m_maskRed = r;
 669     M_IMGDATA->m_maskGreen = g;
 670     M_IMGDATA->m_maskBlue = b;
 671     M_IMGDATA->m_hasMask = TRUE;
 672 }
 673
 674 unsigned char wxImage::GetMaskRed() const
 675 {
 676     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 677
 678     return M_IMGDATA->m_maskRed;
 679 }
 680
 681 unsigned char wxImage::GetMaskGreen() const
 682 {
 683     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 684
 685     return M_IMGDATA->m_maskGreen;
 686 }
 687
 688 unsigned char wxImage::GetMaskBlue() const
 689 {
 690     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 691
 692     return M_IMGDATA->m_maskBlue;
 693 }
 694
 695 void wxImage::SetMask( bool mask )
 696 {
 697     wxCHECK_RET( Ok(), wxT("invalid image") );
 698
 699     M_IMGDATA->m_hasMask = mask;
 700 }
 701
 702 bool wxImage::HasMask() const
 703 {
 704     wxCHECK_MSG( Ok(), FALSE, wxT("invalid image") );
 705
 706     return M_IMGDATA->m_hasMask;
 707 }
 708
 709 int wxImage::GetWidth() const
 710 {
 711     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 712
 713     return M_IMGDATA->m_width;
 714 }
 715
 716 int wxImage::GetHeight() const
 717 {
 718     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 719
 720     return M_IMGDATA->m_height;
 721 }
 722
 723 #if wxUSE_PALETTE
 724
 725 // Palette functions
 726
 727 bool wxImage::HasPalette() const
 728 {
 729     if (!Ok())
 730         return FALSE;
 731
 732     return M_IMGDATA->m_palette.Ok();
 733 }
 734
 735 const wxPalette& wxImage::GetPalette() const
 736 {
 737     wxCHECK_MSG( Ok(), wxNullPalette, wxT("invalid image") );
 738
 739     return M_IMGDATA->m_palette;
 740 }
 741
 742 void wxImage::SetPalette(const wxPalette& palette)
 743 {
 744     wxCHECK_RET( Ok(), wxT("invalid image") );
 745
 746     M_IMGDATA->m_palette = palette;
 747 }
 748
 749 #endif // wxUSE_PALETTE
 750
 751 // Option functions (arbitrary name/value mapping)
 752 void wxImage::SetOption(const wxString& name, const wxString& value)
 753 {
 754     wxCHECK_RET( Ok(), wxT("invalid image") );
 755
 756     int idx = M_IMGDATA->m_optionNames.Index(name, FALSE);
 757     if (idx == wxNOT_FOUND)
 758     {
 759         M_IMGDATA->m_optionNames.Add(name);
 760         M_IMGDATA->m_optionValues.Add(value);
 761     }
 762     else
 763     {
 764         M_IMGDATA->m_optionNames[idx] = name;
 765         M_IMGDATA->m_optionValues[idx] = value;
 766     }
 767 }
 768
 769 void wxImage::SetOption(const wxString& name, int value)
 770 {
 771     wxString valStr;
 772     valStr.Printf(wxT("%d"), value);
 773     SetOption(name, valStr);
 774 }
 775
 776 wxString wxImage::GetOption(const wxString& name) const
 777 {
 778     wxCHECK_MSG( Ok(), wxEmptyString, wxT("invalid image") );
 779
 780     int idx = M_IMGDATA->m_optionNames.Index(name, FALSE);
 781     if (idx == wxNOT_FOUND)
 782         return wxEmptyString;
 783     else
 784         return M_IMGDATA->m_optionValues[idx];
 785 }
 786
 787 int wxImage::GetOptionInt(const wxString& name) const
 788 {
 789     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 790
 791     return wxAtoi(GetOption(name));
 792 }
 793
 794 bool wxImage::HasOption(const wxString& name) const
 795 {
 796     wxCHECK_MSG( Ok(), FALSE, wxT("invalid image") );
 797
 798     return (M_IMGDATA->m_optionNames.Index(name, FALSE) != wxNOT_FOUND);
 799 }
 800
 801 bool wxImage::LoadFile( const wxString& filename, long type )
 802 {
 803 #if wxUSE_STREAMS
 804     if (wxFileExists(filename))
 805     {
 806         wxFileInputStream stream(filename);
 807         wxBufferedInputStream bstream( stream );
 808         return LoadFile(bstream, type);
 809     }
 810     else
 811     {
 812         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
 813
 814         return FALSE;
 815     }
 816 #else // !wxUSE_STREAMS
 817     return FALSE;
 818 #endif // wxUSE_STREAMS
 819 }
 820
 821 bool wxImage::LoadFile( const wxString& filename, const wxString& mimetype )
 822 {
 823 #if wxUSE_STREAMS
 824     if (wxFileExists(filename))
 825     {
 826         wxFileInputStream stream(filename);
 827         wxBufferedInputStream bstream( stream );
 828         return LoadFile(bstream, mimetype);
 829     }
 830     else
 831     {
 832         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
 833
 834         return FALSE;
 835     }
 836 #else // !wxUSE_STREAMS
 837     return FALSE;
 838 #endif // wxUSE_STREAMS
 839 }
 840
 841 bool wxImage::SaveFile( const wxString& filename, int type )
 842 {
 843 #if wxUSE_STREAMS
 844     wxFileOutputStream stream(filename);
 845
 846     if ( stream.LastError() == wxStream_NOERROR )
 847     {
 848         wxBufferedOutputStream bstream( stream );
 849         return SaveFile(bstream, type);
 850     }
 851 #endif // wxUSE_STREAMS
 852
 853     return FALSE;
 854 }
 855
 856 bool wxImage::SaveFile( const wxString& filename, const wxString& mimetype )
 857 {
 858 #if wxUSE_STREAMS
 859     wxFileOutputStream stream(filename);
 860
 861     if ( stream.LastError() == wxStream_NOERROR )
 862     {
 863         wxBufferedOutputStream bstream( stream );
 864         return SaveFile(bstream, mimetype);
 865     }
 866 #endif // wxUSE_STREAMS
 867
 868     return FALSE;
 869 }
 870
 871 bool wxImage::CanRead( const wxString &name )
 872 {
 873 #if wxUSE_STREAMS
 874   wxFileInputStream stream(name);
 875   return CanRead(stream);
 876 #else
 877   return FALSE;
 878 #endif
 879 }
 880
 881 #if wxUSE_STREAMS
 882
 883 bool wxImage::CanRead( wxInputStream &stream )
 884 {
 885   wxList &list=GetHandlers();
 886
 887   for ( wxList::Node *node = list.GetFirst(); node; node = node->GetNext() )
 888     {
 889       wxImageHandler *handler=(wxImageHandler*)node->GetData();
 890       if (handler->CanRead( stream ))
 891         return TRUE;
 892     }
 893
 894   return FALSE;
 895 }
 896
 897 bool wxImage::LoadFile( wxInputStream& stream, long type )
 898 {
 899     UnRef();
 900
 901     m_refData = new wxImageRefData;
 902
 903     wxImageHandler *handler;
 904
 905     if (type==wxBITMAP_TYPE_ANY)
 906     {
 907         wxList &list=GetHandlers();
 908
 909         for ( wxList::Node *node = list.GetFirst(); node; node = node->GetNext() )
 910         {
 911              handler=(wxImageHandler*)node->GetData();
 912              if (handler->CanRead( stream ))
 913                  return handler->LoadFile( this, stream );
 914
 915         }
 916
 917         wxLogWarning( _("No handler found for image type.") );
 918         return FALSE;
 919     }
 920
 921     handler = FindHandler(type);
 922
 923     if (handler == NULL)
 924     {
 925         wxLogWarning( _("No image handler for type %d defined."), type );
 926
 927         return FALSE;
 928     }
 929
 930     return handler->LoadFile( this, stream );
 931 }
 932
 933 bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype )
 934 {
 935     UnRef();
 936
 937     m_refData = new wxImageRefData;
 938
 939     wxImageHandler *handler = FindHandlerMime(mimetype);
 940
 941     if (handler == NULL)
 942     {
 943         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
 944
 945         return FALSE;
 946     }
 947
 948     return handler->LoadFile( this, stream );
 949 }
 950
 951 bool wxImage::SaveFile( wxOutputStream& stream, int type )
 952 {
 953     wxCHECK_MSG( Ok(), FALSE, wxT("invalid image") );
 954
 955     wxImageHandler *handler = FindHandler(type);
 956
 957     if (handler == NULL)
 958     {
 959         wxLogWarning( _("No image handler for type %d defined."), type );
 960
 961         return FALSE;
 962     }
 963
 964     return handler->SaveFile( this, stream );
 965 }
 966
 967 bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype )
 968 {
 969     wxCHECK_MSG( Ok(), FALSE, wxT("invalid image") );
 970
 971     wxImageHandler *handler = FindHandlerMime(mimetype);
 972
 973     if (handler == NULL)
 974     {
 975         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
 976
 977         return FALSE;
 978     }
 979
 980     return handler->SaveFile( this, stream );
 981 }
 982 #endif // wxUSE_STREAMS
 983
 984 void wxImage::AddHandler( wxImageHandler *handler )
 985 {
 986     // make sure that the memory will be freed at the program end
 987     sm_handlers.DeleteContents(TRUE);
 988
 989     sm_handlers.Append( handler );
 990 }
 991
 992 void wxImage::InsertHandler( wxImageHandler *handler )
 993 {
 994     // make sure that the memory will be freed at the program end
 995     sm_handlers.DeleteContents(TRUE);
 996
 997     sm_handlers.Insert( handler );
 998 }
 999
1000 bool wxImage::RemoveHandler( const wxString& name )
1001 {
1002     wxImageHandler *handler = FindHandler(name);
1003     if (handler)
1004     {
1005         sm_handlers.DeleteObject(handler);
1006         return TRUE;
1007     }
1008     else
1009         return FALSE;
1010 }
1011
1012 wxImageHandler *wxImage::FindHandler( const wxString& name )
1013 {
1014     wxNode *node = sm_handlers.First();
1015     while (node)
1016     {
1017         wxImageHandler *handler = (wxImageHandler*)node->Data();
1018         if (handler->GetName().Cmp(name) == 0) return handler;
1019
1020         node = node->Next();
1021     }
1022     return (wxImageHandler *)NULL;
1023 }
1024
1025 wxImageHandler *wxImage::FindHandler( const wxString& extension, long bitmapType )
1026 {
1027     wxNode *node = sm_handlers.First();
1028     while (node)
1029     {
1030         wxImageHandler *handler = (wxImageHandler*)node->Data();
1031         if ( (handler->GetExtension().Cmp(extension) == 0) &&
1032             (bitmapType == -1 || handler->GetType() == bitmapType) )
1033             return handler;
1034         node = node->Next();
1035     }
1036     return (wxImageHandler*)NULL;
1037 }
1038
1039 wxImageHandler *wxImage::FindHandler( long bitmapType )
1040 {
1041     wxNode *node = sm_handlers.First();
1042     while (node)
1043     {
1044         wxImageHandler *handler = (wxImageHandler *)node->Data();
1045         if (handler->GetType() == bitmapType) return handler;
1046         node = node->Next();
1047     }
1048     return NULL;
1049 }
1050
1051 wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype )
1052 {
1053     wxNode *node = sm_handlers.First();
1054     while (node)
1055     {
1056         wxImageHandler *handler = (wxImageHandler *)node->Data();
1057         if (handler->GetMimeType().IsSameAs(mimetype, FALSE)) return handler;
1058         node = node->Next();
1059     }
1060     return NULL;
1061 }
1062
1063 void wxImage::InitStandardHandlers()
1064 {
1065     AddHandler(new wxBMPHandler);
1066 #if wxUSE_XPM && !defined(__WXGTK__) && !defined(__WXMOTIF__)
1067     AddHandler(new wxXPMHandler);
1068 #endif
1069 }
1070
1071 void wxImage::CleanUpHandlers()
1072 {
1073     wxNode *node = sm_handlers.First();
1074     while (node)
1075     {
1076         wxImageHandler *handler = (wxImageHandler *)node->Data();
1077         wxNode *next = node->Next();
1078         delete handler;
1079         delete node;
1080         node = next;
1081     }
1082 }
1083
1084 //-----------------------------------------------------------------------------
1085 // wxImageHandler
1086 //-----------------------------------------------------------------------------
1087
1088 IMPLEMENT_ABSTRACT_CLASS(wxImageHandler,wxObject)
1089
1090 #if wxUSE_STREAMS
1091 bool wxImageHandler::LoadFile( wxImage *WXUNUSED(image), wxInputStream& WXUNUSED(stream), bool WXUNUSED(verbose), int WXUNUSED(index) )
1092 {
1093     return FALSE;
1094 }
1095
1096 bool wxImageHandler::SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream), bool WXUNUSED(verbose) )
1097 {
1098     return FALSE;
1099 }
1100
1101 int wxImageHandler::GetImageCount( wxInputStream& WXUNUSED(stream) )
1102 {
1103     return 1;
1104 }
1105
1106 bool wxImageHandler::CanRead( const wxString& name )
1107 {
1108     if (wxFileExists(name))
1109     {
1110         wxFileInputStream stream(name);
1111         return CanRead(stream);
1112     }
1113
1114     else {
1115         wxLogError( _("Can't check image format of file '%s': file does not exist."), name.c_str() );
1116
1117         return FALSE;
1118     }
1119 //    return FALSE;
1120 }
1121
1122 #endif // wxUSE_STREAMS
1123
1124
1125
1126 //-----------------------------------------------------------------------------
1127 // wxBitmap convertion routines
1128 //-----------------------------------------------------------------------------
1129
1130 #if wxUSE_GUI
1131
1132 #ifdef __WXGTK__
1133 wxBitmap wxImage::ConvertToMonoBitmap( unsigned char red, unsigned char green, unsigned char blue ) const
1134 {
1135     wxImage mono = this->ConvertToMono( red, green, blue );
1136     wxBitmap bitmap( mono, 1 );
1137     return bitmap;
1138 }
1139 #endif
1140
1141 wxBitmap wxImage::ConvertToBitmap() const
1142 {
1143     wxBitmap bitmap( *this );
1144     return bitmap;
1145 }
1146
1147 wxImage::wxImage( const wxBitmap &bitmap )
1148 {
1149     *this = bitmap.ConvertToImage();
1150 }
1151
1152 #endif
1153
1154
1155
1156 // A module to allow wxImage initialization/cleanup
1157 // without calling these functions from app.cpp or from
1158 // the user's application.
1159
1160 class wxImageModule: public wxModule
1161 {
1162 DECLARE_DYNAMIC_CLASS(wxImageModule)
1163 public:
1164     wxImageModule() {}
1165     bool OnInit() { wxImage::InitStandardHandlers(); return TRUE; };
1166     void OnExit() { wxImage::CleanUpHandlers(); };
1167 };
1168
1169 IMPLEMENT_DYNAMIC_CLASS(wxImageModule, wxModule)
1170
1171
1172 //-----------------------------------------------------------------------------
1173
1174 // GRG, Dic/99
1175 // Counts and returns the number of different colours. Optionally stops
1176 // when it exceeds 'stopafter' different colours. This is useful, for
1177 // example, to see if the image can be saved as 8-bit (256 colour or
1178 // less, in this case it would be invoked as CountColours(256)). Default
1179 // value for stopafter is -1 (don't care).
1180 //
1181 unsigned long wxImage::CountColours( unsigned long stopafter )
1182 {
1183     wxHashTable h;
1184     wxObject dummy;
1185     unsigned char r, g, b;
1186     unsigned char *p;
1187     unsigned long size, nentries, key;
1188
1189     p = GetData();
1190     size = GetWidth() * GetHeight();
1191     nentries = 0;
1192
1193     for (unsigned long j = 0; (j < size) && (nentries <= stopafter) ; j++)
1194     {
1195         r = *(p++);
1196         g = *(p++);
1197         b = *(p++);
1198         key = (r << 16) | (g << 8) | b;
1199
1200         if (h.Get(key) == NULL)
1201         {
1202             h.Put(key, &dummy);
1203             nentries++;
1204         }
1205     }
1206
1207     return nentries;
1208 }
1209
1210
1211 // GRG, Dic/99
1212 // Computes the histogram of the image and fills a hash table, indexed
1213 // with integer keys built as 0xRRGGBB, containing wxHNode objects. Each
1214 // wxHNode contains an 'index' (useful to build a palette with the image
1215 // colours) and a 'value', which is the number of pixels in the image with
1216 // that colour.
1217 //
1218 unsigned long wxImage::ComputeHistogram( wxHashTable &h )
1219 {
1220     unsigned char r, g, b;
1221     unsigned char *p;
1222     unsigned long size, nentries, key;
1223     wxHNode *hnode;
1224
1225     p = GetData();
1226     size = GetWidth() * GetHeight();
1227     nentries = 0;
1228
1229     for (unsigned long j = 0; j < size; j++)
1230     {
1231         r = *(p++);
1232         g = *(p++);
1233         b = *(p++);
1234         key = (r << 16) | (g << 8) | b;
1235
1236         hnode = (wxHNode *) h.Get(key);
1237
1238         if (hnode)
1239             hnode->value++;
1240         else
1241         {
1242             hnode = new wxHNode();
1243             hnode->index = nentries++;
1244             hnode->value = 1;
1245
1246             h.Put(key, (wxObject *)hnode);
1247         }
1248     }
1249
1250     return nentries;
1251 }
1252
1253 /*
1254  * Rotation code by Carlos Moreno
1255  */
1256
1257 // GRG: I've removed wxRotationPoint - we already have wxRealPoint which
1258 //      does exactly the same thing. And I also got rid of wxRotationPixel
1259 //      bacause of potential problems in architectures where alignment
1260 //      is an issue, so I had to rewrite parts of the code.
1261
1262 static const double gs_Epsilon = 1e-10;
1263
1264 static inline int wxCint (double x)
1265 {
1266     return (x > 0) ? (int) (x + 0.5) : (int) (x - 0.5);
1267 }
1268
1269
1270 // Auxiliary function to rotate a point (x,y) with respect to point p0
1271 // make it inline and use a straight return to facilitate optimization
1272 // also, the function receives the sine and cosine of the angle to avoid
1273 // repeating the time-consuming calls to these functions -- sin/cos can
1274 // be computed and stored in the calling function.
1275
1276 inline wxRealPoint rotated_point (const wxRealPoint & p, double cos_angle, double sin_angle, const wxRealPoint & p0)
1277 {
1278     return wxRealPoint (p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle,
1279                         p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle);
1280 }
1281
1282 inline wxRealPoint rotated_point (double x, double y, double cos_angle, double sin_angle, const wxRealPoint & p0)
1283 {
1284     return rotated_point (wxRealPoint(x,y), cos_angle, sin_angle, p0);
1285 }
1286
1287 wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool interpolating, wxPoint * offset_after_rotation) const
1288 {
1289     int i;
1290     angle = -angle;     // screen coordinates are a mirror image of "real" coordinates
1291
1292     // Create pointer-based array to accelerate access to wxImage's data
1293     unsigned char ** data = new unsigned char * [GetHeight()];
1294
1295     data[0] = GetData();
1296
1297     for (i = 1; i < GetHeight(); i++)
1298         data[i] = data[i - 1] + (3 * GetWidth());
1299
1300     // precompute coefficients for rotation formula
1301     // (sine and cosine of the angle)
1302     const double cos_angle = cos(angle);
1303     const double sin_angle = sin(angle);
1304
1305     // Create new Image to store the result
1306     // First, find rectangle that covers the rotated image;  to do that,
1307     // rotate the four corners
1308
1309     const wxRealPoint p0(centre_of_rotation.x, centre_of_rotation.y);
1310
1311     wxRealPoint p1 = rotated_point (0, 0, cos_angle, sin_angle, p0);
1312     wxRealPoint p2 = rotated_point (0, GetHeight(), cos_angle, sin_angle, p0);
1313     wxRealPoint p3 = rotated_point (GetWidth(), 0, cos_angle, sin_angle, p0);
1314     wxRealPoint p4 = rotated_point (GetWidth(), GetHeight(), cos_angle, sin_angle, p0);
1315
1316     int x1 = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x)));
1317     int y1 = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y)));
1318     int x2 = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x)));
1319     int y2 = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y)));
1320
1321     wxImage rotated (x2 - x1 + 1, y2 - y1 + 1);
1322
1323     if (offset_after_rotation != NULL)
1324     {
1325         *offset_after_rotation = wxPoint (x1, y1);
1326     }
1327
1328     // GRG: The rotated (destination) image is always accessed
1329     //      sequentially, so there is no need for a pointer-based
1330     //      array here (and in fact it would be slower).
1331     //
1332     unsigned char * dst = rotated.GetData();
1333
1334     // GRG: if the original image has a mask, use its RGB values
1335     //      as the blank pixel, else, fall back to default (black).
1336     //
1337     unsigned char blank_r = 0;
1338     unsigned char blank_g = 0;
1339     unsigned char blank_b = 0;
1340
1341     if (HasMask())
1342     {
1343         blank_r = GetMaskRed();
1344         blank_g = GetMaskGreen();
1345         blank_b = GetMaskBlue();
1346         rotated.SetMaskColour( blank_r, blank_g, blank_b );
1347     }
1348
1349     // Now, for each point of the rotated image, find where it came from, by
1350     // performing an inverse rotation (a rotation of -angle) and getting the
1351     // pixel at those coordinates
1352
1353     // GRG: I've taken the (interpolating) test out of the loops, so that
1354     //      it is done only once, instead of repeating it for each pixel.
1355
1356     int x;
1357     if (interpolating)
1358     {
1359         for (int y = 0; y < rotated.GetHeight(); y++)
1360         {
1361             for (x = 0; x < rotated.GetWidth(); x++)
1362             {
1363                 wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
1364
1365                 if (-0.25 < src.x && src.x < GetWidth() - 0.75 &&
1366                     -0.25 < src.y && src.y < GetHeight() - 0.75)
1367                 {
1368                     // interpolate using the 4 enclosing grid-points.  Those
1369                     // points can be obtained using floor and ceiling of the
1370                     // exact coordinates of the point
1371                         // C.M. 2000-02-17:  when the point is near the border, special care is required.
1372
1373                     int x1, y1, x2, y2;
1374
1375                     if (0 < src.x && src.x < GetWidth() - 1)
1376                     {
1377                         x1 = wxCint(floor(src.x));
1378                         x2 = wxCint(ceil(src.x));
1379                     }
1380                     else    // else means that x is near one of the borders (0 or width-1)
1381                     {
1382                         x1 = x2 = wxCint (src.x);
1383                     }
1384
1385                     if (0 < src.y && src.y < GetHeight() - 1)
1386                     {
1387                         y1 = wxCint(floor(src.y));
1388                         y2 = wxCint(ceil(src.y));
1389                     }
1390                     else
1391                     {
1392                         y1 = y2 = wxCint (src.y);
1393                     }
1394
1395                     // get four points and the distances (square of the distance,
1396                     // for efficiency reasons) for the interpolation formula
1397
1398                     // GRG: Do not calculate the points until they are
1399                     //      really needed -- this way we can calculate
1400                     //      just one, instead of four, if d1, d2, d3
1401                     //      or d4 are < gs_Epsilon
1402
1403                     const double d1 = (src.x - x1) * (src.x - x1) + (src.y - y1) * (src.y - y1);
1404                     const double d2 = (src.x - x2) * (src.x - x2) + (src.y - y1) * (src.y - y1);
1405                     const double d3 = (src.x - x2) * (src.x - x2) + (src.y - y2) * (src.y - y2);
1406                     const double d4 = (src.x - x1) * (src.x - x1) + (src.y - y2) * (src.y - y2);
1407
1408                     // Now interpolate as a weighted average of the four surrounding
1409                     // points, where the weights are the distances to each of those points
1410
1411                     // If the point is exactly at one point of the grid of the source
1412                     // image, then don't interpolate -- just assign the pixel
1413
1414                     if (d1 < gs_Epsilon)        // d1,d2,d3,d4 are positive -- no need for abs()
1415                     {
1416                         unsigned char *p = data[y1] + (3 * x1);
1417                         *(dst++) = *(p++);
1418                         *(dst++) = *(p++);
1419                         *(dst++) = *(p++);
1420                     }
1421                     else if (d2 < gs_Epsilon)
1422                     {
1423                         unsigned char *p = data[y1] + (3 * x2);
1424                         *(dst++) = *(p++);
1425                         *(dst++) = *(p++);
1426                         *(dst++) = *(p++);
1427                     }
1428                     else if (d3 < gs_Epsilon)
1429                     {
1430                         unsigned char *p = data[y2] + (3 * x2);
1431                         *(dst++) = *(p++);
1432                         *(dst++) = *(p++);
1433                         *(dst++) = *(p++);
1434                     }
1435                     else if (d4 < gs_Epsilon)
1436                     {
1437                         unsigned char *p = data[y2] + (3 * x1);
1438                         *(dst++) = *(p++);
1439                         *(dst++) = *(p++);
1440                         *(dst++) = *(p++);
1441                     }
1442                     else
1443                     {
1444                         // weights for the weighted average are proportional to the inverse of the distance
1445                         unsigned char *v1 = data[y1] + (3 * x1);
1446                         unsigned char *v2 = data[y1] + (3 * x2);
1447                         unsigned char *v3 = data[y2] + (3 * x2);
1448                         unsigned char *v4 = data[y2] + (3 * x1);
1449
1450                         const double w1 = 1/d1, w2 = 1/d2, w3 = 1/d3, w4 = 1/d4;
1451
1452                         // GRG: Unrolled.
1453
1454                         *(dst++) = (unsigned char)
1455                             ( (w1 * *(v1++) + w2 * *(v2++) +
1456                                w3 * *(v3++) + w4 * *(v4++)) /
1457                               (w1 + w2 + w3 + w4) );
1458                         *(dst++) = (unsigned char)
1459                             ( (w1 * *(v1++) + w2 * *(v2++) +
1460                                w3 * *(v3++) + w4 * *(v4++)) /
1461                               (w1 + w2 + w3 + w4) );
1462                         *(dst++) = (unsigned char)
1463                             ( (w1 * *(v1++) + w2 * *(v2++) +
1464                                w3 * *(v3++) + w4 * *(v4++)) /
1465                               (w1 + w2 + w3 + w4) );
1466                     }
1467                 }
1468                 else
1469                 {
1470                     *(dst++) = blank_r;
1471                     *(dst++) = blank_g;
1472                     *(dst++) = blank_b;
1473                 }
1474             }
1475         }
1476     }
1477     else    // not interpolating
1478     {
1479         for (int y = 0; y < rotated.GetHeight(); y++)
1480         {
1481             for (x = 0; x < rotated.GetWidth(); x++)
1482             {
1483                 wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
1484
1485                 const int xs = wxCint (src.x);      // wxCint rounds to the
1486                 const int ys = wxCint (src.y);      // closest integer
1487
1488                 if (0 <= xs && xs < GetWidth() &&
1489                     0 <= ys && ys < GetHeight())
1490                 {
1491                     unsigned char *p = data[ys] + (3 * xs);
1492                     *(dst++) = *(p++);
1493                     *(dst++) = *(p++);
1494                     *(dst++) = *(p++);
1495                 }
1496                 else
1497                 {
1498                     *(dst++) = blank_r;
1499                     *(dst++) = blank_g;
1500                     *(dst++) = blank_b;
1501                 }
1502             }
1503         }
1504     }
1505
1506     delete [] data;
1507
1508     return rotated;
1509 }
1510
1511 #endif // wxUSE_IMAGE