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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  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 #include "wx/hash.h"
  35 #include "wx/utils.h"
  36 #include "wx/math.h"
  37
  38 #if wxUSE_XPM
  39 #include "wx/xpmdecod.h"
  40 #endif
  41
  42 // For memcpy
  43 #include <string.h>
  44
  45 #ifdef __SALFORDC__
  46     #undef FAR
  47 #endif
  48
  49
  50 //-----------------------------------------------------------------------------
  51 // wxImage
  52 //-----------------------------------------------------------------------------
  53
  54 class wxImageRefData: public wxObjectRefData
  55 {
  56 public:
  57     wxImageRefData();
  58     virtual ~wxImageRefData();
  59
  60     int             m_width;
  61     int             m_height;
  62     unsigned char  *m_data;
  63
  64     bool            m_hasMask;
  65     unsigned char   m_maskRed,m_maskGreen,m_maskBlue;
  66
  67     // alpha channel data, may be NULL for the formats without alpha support
  68     unsigned char  *m_alpha;
  69
  70     bool            m_ok;
  71
  72     // if true, m_data is pointer to static data and shouldn't be freed
  73     bool            m_static;
  74
  75     // same as m_static but for m_alpha
  76     bool            m_staticAlpha;
  77
  78 #if wxUSE_PALETTE
  79     wxPalette       m_palette;
  80 #endif // wxUSE_PALETTE
  81
  82     wxArrayString   m_optionNames;
  83     wxArrayString   m_optionValues;
  84
  85     DECLARE_NO_COPY_CLASS(wxImageRefData)
  86 };
  87
  88 wxImageRefData::wxImageRefData()
  89 {
  90     m_width = 0;
  91     m_height = 0;
  92     m_data =
  93     m_alpha = (unsigned char *) NULL;
  94
  95     m_maskRed = 0;
  96     m_maskGreen = 0;
  97     m_maskBlue = 0;
  98     m_hasMask = false;
  99
 100     m_ok = false;
 101     m_static =
 102     m_staticAlpha = false;
 103 }
 104
 105 wxImageRefData::~wxImageRefData()
 106 {
 107     if ( !m_static )
 108         free( m_data );
 109     if ( !m_staticAlpha )
 110         free( m_alpha );
 111 }
 112
 113 wxList wxImage::sm_handlers;
 114
 115 wxImage wxNullImage;
 116
 117 //-----------------------------------------------------------------------------
 118
 119 #define M_IMGDATA ((wxImageRefData *)m_refData)
 120
 121 IMPLEMENT_DYNAMIC_CLASS(wxImage, wxObject)
 122
 123 wxImage::wxImage( int width, int height, bool clear )
 124 {
 125     Create( width, height, clear );
 126 }
 127
 128 wxImage::wxImage( int width, int height, unsigned char* data, bool static_data )
 129 {
 130     Create( width, height, data, static_data );
 131 }
 132
 133 wxImage::wxImage( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data )
 134 {
 135     Create( width, height, data, alpha, static_data );
 136 }
 137
 138 wxImage::wxImage( const wxString& name, long type, int index )
 139 {
 140     LoadFile( name, type, index );
 141 }
 142
 143 wxImage::wxImage( const wxString& name, const wxString& mimetype, int index )
 144 {
 145     LoadFile( name, mimetype, index );
 146 }
 147
 148 #if wxUSE_STREAMS
 149 wxImage::wxImage( wxInputStream& stream, long type, int index )
 150 {
 151     LoadFile( stream, type, index );
 152 }
 153
 154 wxImage::wxImage( wxInputStream& stream, const wxString& mimetype, int index )
 155 {
 156     LoadFile( stream, mimetype, index );
 157 }
 158 #endif // wxUSE_STREAMS
 159
 160 wxImage::wxImage( const wxImage& image )
 161     : wxObject()
 162 {
 163     Ref(image);
 164 }
 165
 166 wxImage::wxImage( const wxImage* image )
 167 {
 168     if (image) Ref(*image);
 169 }
 170
 171 wxImage::wxImage( const char** xpmData )
 172 {
 173     Create(xpmData);
 174 }
 175
 176 wxImage::wxImage( char** xpmData )
 177 {
 178     Create((const char**) xpmData);
 179 }
 180
 181 bool wxImage::Create( const char** xpmData )
 182 {
 183 #if wxUSE_XPM
 184     UnRef();
 185
 186     wxXPMDecoder decoder;
 187     (*this) = decoder.ReadData(xpmData);
 188     return Ok();
 189 #else
 190     return false;
 191 #endif
 192 }
 193
 194 bool wxImage::Create( int width, int height, bool clear )
 195 {
 196     UnRef();
 197
 198     m_refData = new wxImageRefData();
 199
 200     M_IMGDATA->m_data = (unsigned char *) malloc( width*height*3 );
 201     if (!M_IMGDATA->m_data)
 202     {
 203         UnRef();
 204         return false;
 205     }
 206
 207     if (clear)
 208         memset(M_IMGDATA->m_data, 0, width*height*3);
 209
 210     M_IMGDATA->m_width = width;
 211     M_IMGDATA->m_height = height;
 212     M_IMGDATA->m_ok = true;
 213
 214     return true;
 215 }
 216
 217 bool wxImage::Create( int width, int height, unsigned char* data, bool static_data )
 218 {
 219     UnRef();
 220
 221     wxCHECK_MSG( data, false, _T("NULL data in wxImage::Create") );
 222
 223     m_refData = new wxImageRefData();
 224
 225     M_IMGDATA->m_data = data;
 226     M_IMGDATA->m_width = width;
 227     M_IMGDATA->m_height = height;
 228     M_IMGDATA->m_ok = true;
 229     M_IMGDATA->m_static = static_data;
 230
 231     return true;
 232 }
 233
 234 bool wxImage::Create( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data )
 235 {
 236     UnRef();
 237
 238     wxCHECK_MSG( data, false, _T("NULL data in wxImage::Create") );
 239
 240     m_refData = new wxImageRefData();
 241
 242     M_IMGDATA->m_data = data;
 243     M_IMGDATA->m_alpha = alpha;
 244     M_IMGDATA->m_width = width;
 245     M_IMGDATA->m_height = height;
 246     M_IMGDATA->m_ok = true;
 247     M_IMGDATA->m_static = static_data;
 248
 249     return true;
 250 }
 251
 252 void wxImage::Destroy()
 253 {
 254     UnRef();
 255 }
 256
 257 wxImage wxImage::Copy() const
 258 {
 259     wxImage image;
 260
 261     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 262
 263     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 264
 265     unsigned char *data = image.GetData();
 266
 267     wxCHECK_MSG( data, image, wxT("unable to create image") );
 268
 269     image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 270     image.SetMask( M_IMGDATA->m_hasMask );
 271
 272     memcpy( data, GetData(), M_IMGDATA->m_width*M_IMGDATA->m_height*3 );
 273
 274     // also copy the image options
 275     wxImageRefData *imgData = (wxImageRefData *)image.m_refData;
 276     imgData->m_optionNames = M_IMGDATA->m_optionNames;
 277     imgData->m_optionValues = M_IMGDATA->m_optionValues;
 278
 279     return image;
 280 }
 281
 282 wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const
 283 {
 284     if( xFactor == 1 && yFactor == 1 )
 285         return Copy() ;
 286
 287     wxImage image;
 288
 289     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 290
 291     // can't scale to/from 0 size
 292     wxCHECK_MSG( (xFactor > 0) && (yFactor > 0), image,
 293                  wxT("invalid new image size") );
 294
 295     long old_height = M_IMGDATA->m_height,
 296          old_width  = M_IMGDATA->m_width;
 297
 298     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 299                  wxT("invalid old image size") );
 300
 301     long width = old_width / xFactor ;
 302     long height = old_height / yFactor ;
 303
 304     image.Create( width, height, false );
 305
 306     char unsigned *data = image.GetData();
 307
 308     wxCHECK_MSG( data, image, wxT("unable to create image") );
 309
 310     bool hasMask = false ;
 311     unsigned char maskRed = 0;
 312     unsigned char maskGreen = 0;
 313     unsigned char maskBlue =0 ;
 314
 315     unsigned char *source_data = M_IMGDATA->m_data;
 316     unsigned char *target_data = data;
 317     unsigned char *source_alpha = 0 ;
 318     unsigned char *target_alpha = 0 ;
 319     if (M_IMGDATA->m_hasMask)
 320     {
 321         hasMask = true ;
 322         maskRed = M_IMGDATA->m_maskRed;
 323         maskGreen = M_IMGDATA->m_maskGreen;
 324         maskBlue =M_IMGDATA->m_maskBlue ;
 325
 326         image.SetMaskColour( M_IMGDATA->m_maskRed,
 327                              M_IMGDATA->m_maskGreen,
 328                              M_IMGDATA->m_maskBlue );
 329     }
 330     else
 331     {
 332         source_alpha = M_IMGDATA->m_alpha ;
 333         if ( source_alpha )
 334         {
 335             image.SetAlpha() ;
 336             target_alpha = image.GetAlpha() ;
 337         }
 338     }
 339
 340     for (long y = 0; y < height; y++)
 341     {
 342         for (long x = 0; x < width; x++)
 343         {
 344             unsigned long avgRed = 0 ;
 345             unsigned long avgGreen = 0;
 346             unsigned long avgBlue = 0;
 347             unsigned long avgAlpha = 0 ;
 348             unsigned long counter = 0 ;
 349             // determine average
 350             for ( int y1 = 0 ; y1 < yFactor ; ++y1 )
 351             {
 352                 long y_offset = (y * yFactor + y1) * old_width;
 353                 for ( int x1 = 0 ; x1 < xFactor ; ++x1 )
 354                 {
 355                     unsigned char *pixel = source_data + 3 * ( y_offset + x * xFactor + x1 ) ;
 356                     unsigned char red = pixel[0] ;
 357                     unsigned char green = pixel[1] ;
 358                     unsigned char blue = pixel[2] ;
 359                     unsigned char alpha = 255  ;
 360                     if ( source_alpha )
 361                         alpha = *(source_alpha + y_offset + x * xFactor + x1) ;
 362                     if ( !hasMask || red != maskRed || green != maskGreen || blue != maskBlue )
 363                     {
 364                         if ( alpha > 0 )
 365                         {
 366                             avgRed += red ;
 367                             avgGreen += green ;
 368                             avgBlue += blue ;
 369                         }
 370                         avgAlpha += alpha ;
 371                         counter++ ;
 372                     }
 373                 }
 374             }
 375             if ( counter == 0 )
 376             {
 377                 *(target_data++) = M_IMGDATA->m_maskRed ;
 378                 *(target_data++) = M_IMGDATA->m_maskGreen ;
 379                 *(target_data++) = M_IMGDATA->m_maskBlue ;
 380             }
 381             else
 382             {
 383                 if ( source_alpha )
 384                     *(target_alpha++) = (unsigned char)(avgAlpha / counter ) ;
 385                 *(target_data++) = (unsigned char)(avgRed / counter);
 386                 *(target_data++) = (unsigned char)(avgGreen / counter);
 387                 *(target_data++) = (unsigned char)(avgBlue / counter);
 388             }
 389         }
 390     }
 391
 392     // In case this is a cursor, make sure the hotspot is scalled accordingly:
 393     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
 394         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
 395                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X))/xFactor);
 396     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
 397         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
 398                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y))/yFactor);
 399
 400     return image;
 401 }
 402
 403 wxImage wxImage::Scale( int width, int height ) const
 404 {
 405     wxImage image;
 406
 407     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 408
 409     // can't scale to/from 0 size
 410     wxCHECK_MSG( (width > 0) && (height > 0), image,
 411                  wxT("invalid new image size") );
 412
 413     long old_height = M_IMGDATA->m_height,
 414          old_width  = M_IMGDATA->m_width;
 415     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 416                  wxT("invalid old image size") );
 417
 418     if ( old_width % width == 0 && old_width >= width &&
 419         old_height % height == 0 && old_height >= height )
 420     {
 421         return ShrinkBy( old_width / width , old_height / height ) ;
 422     }
 423     image.Create( width, height, false );
 424
 425     unsigned char *data = image.GetData();
 426
 427     wxCHECK_MSG( data, image, wxT("unable to create image") );
 428
 429     unsigned char *source_data = M_IMGDATA->m_data;
 430     unsigned char *target_data = data;
 431     unsigned char *source_alpha = 0 ;
 432     unsigned char *target_alpha = 0 ;
 433
 434     if (M_IMGDATA->m_hasMask)
 435     {
 436         image.SetMaskColour( M_IMGDATA->m_maskRed,
 437                              M_IMGDATA->m_maskGreen,
 438                              M_IMGDATA->m_maskBlue );
 439     }
 440     else
 441     {
 442         source_alpha = M_IMGDATA->m_alpha ;
 443         if ( source_alpha )
 444         {
 445             image.SetAlpha() ;
 446             target_alpha = image.GetAlpha() ;
 447         }
 448     }
 449
 450     long x_delta = (old_width<<16) / width;
 451     long y_delta = (old_height<<16) / height;
 452
 453     unsigned char* dest_pixel = target_data;
 454
 455     long y = 0;
 456     for ( long j = 0; j < height; j++ )
 457         {
 458         unsigned char* src_line = &source_data[(y>>16)*old_width*3];
 459         unsigned char* src_alpha_line = source_alpha ? &source_alpha[(y>>16)*old_width] : 0 ;
 460
 461         long x = 0;
 462         for ( long i = 0; i < width; i++ )
 463         {
 464              unsigned char* src_pixel = &src_line[(x>>16)*3];
 465              unsigned char* src_alpha_pixel = source_alpha ? &src_alpha_line[(x>>16)] : 0 ;
 466              dest_pixel[0] = src_pixel[0];
 467              dest_pixel[1] = src_pixel[1];
 468              dest_pixel[2] = src_pixel[2];
 469              dest_pixel += 3;
 470              if ( source_alpha )
 471                 *(target_alpha++) = *src_alpha_pixel ;
 472              x += x_delta;
 473         }
 474
 475         y += y_delta;
 476     }
 477
 478     // In case this is a cursor, make sure the hotspot is scalled accordingly:
 479     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
 480         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
 481                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X)*width)/old_width);
 482     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
 483         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
 484                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y)*height)/old_height);
 485
 486     return image;
 487 }
 488
 489 wxImage wxImage::Rotate90( bool clockwise ) const
 490 {
 491     wxImage image;
 492
 493     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 494
 495     image.Create( M_IMGDATA->m_height, M_IMGDATA->m_width, false );
 496
 497     unsigned char *data = image.GetData();
 498
 499     wxCHECK_MSG( data, image, wxT("unable to create image") );
 500
 501     if (M_IMGDATA->m_hasMask)
 502         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 503
 504     long height = M_IMGDATA->m_height;
 505     long width  = M_IMGDATA->m_width;
 506
 507     unsigned char *source_data = M_IMGDATA->m_data;
 508     unsigned char *target_data;
 509
 510     for (long j = 0; j < height; j++)
 511     {
 512         for (long i = 0; i < width; i++)
 513         {
 514             if (clockwise)
 515                 target_data = data + (((i+1)*height) - j - 1)*3;
 516             else
 517                 target_data = data + ((height*(width-1)) + j - (i*height))*3;
 518             memcpy( target_data, source_data, 3 );
 519             source_data += 3;
 520         }
 521     }
 522
 523     return image;
 524 }
 525
 526 wxImage wxImage::Mirror( bool horizontally ) const
 527 {
 528     wxImage image;
 529
 530     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 531
 532     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 533
 534     unsigned char *data = image.GetData();
 535
 536     wxCHECK_MSG( data, image, wxT("unable to create image") );
 537
 538     if (M_IMGDATA->m_hasMask)
 539         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 540
 541     long height = M_IMGDATA->m_height;
 542     long width  = M_IMGDATA->m_width;
 543
 544     unsigned char *source_data = M_IMGDATA->m_data;
 545     unsigned char *target_data;
 546
 547     if (horizontally)
 548     {
 549         for (long j = 0; j < height; j++)
 550         {
 551             data += width*3;
 552             target_data = data-3;
 553             for (long i = 0; i < width; i++)
 554             {
 555                 memcpy( target_data, source_data, 3 );
 556                 source_data += 3;
 557                 target_data -= 3;
 558             }
 559         }
 560     }
 561     else
 562     {
 563         for (long i = 0; i < height; i++)
 564         {
 565             target_data = data + 3*width*(height-1-i);
 566             memcpy( target_data, source_data, (size_t)3*width );
 567             source_data += 3*width;
 568         }
 569     }
 570
 571     return image;
 572 }
 573
 574 wxImage wxImage::GetSubImage( const wxRect &rect ) const
 575 {
 576     wxImage image;
 577
 578     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 579
 580     wxCHECK_MSG( (rect.GetLeft()>=0) && (rect.GetTop()>=0) && (rect.GetRight()<=GetWidth()) && (rect.GetBottom()<=GetHeight()),
 581                  image, wxT("invalid subimage size") );
 582
 583     int subwidth=rect.GetWidth();
 584     const int subheight=rect.GetHeight();
 585
 586     image.Create( subwidth, subheight, false );
 587
 588     unsigned char *subdata = image.GetData(), *data=GetData();
 589
 590     wxCHECK_MSG( subdata, image, wxT("unable to create image") );
 591
 592     if (M_IMGDATA->m_hasMask)
 593         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 594
 595     const int subleft=3*rect.GetLeft();
 596     const int width=3*GetWidth();
 597     subwidth*=3;
 598
 599     data+=rect.GetTop()*width+subleft;
 600
 601     for (long j = 0; j < subheight; ++j)
 602     {
 603         memcpy( subdata, data, subwidth);
 604         subdata+=subwidth;
 605         data+=width;
 606     }
 607
 608     return image;
 609 }
 610
 611 wxImage wxImage::Size( const wxSize& size, const wxPoint& pos,
 612                        int r_, int g_, int b_ ) const
 613 {
 614     wxImage image;
 615
 616     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 617     wxCHECK_MSG( (size.GetWidth() > 0) && (size.GetHeight() > 0), image, wxT("invalid size") );
 618
 619     int width = GetWidth(), height = GetHeight();
 620     image.Create(size.GetWidth(), size.GetHeight(), false);
 621
 622     unsigned char r = (unsigned char)r_;
 623     unsigned char g = (unsigned char)g_;
 624     unsigned char b = (unsigned char)b_;
 625     if ((r_ == -1) && (g_ == -1) && (b_ == -1))
 626     {
 627         GetOrFindMaskColour( &r, &g, &b );
 628         image.SetMaskColour(r, g, b);
 629     }
 630
 631     image.SetRGB(wxRect(), r, g, b);
 632
 633     wxRect subRect(pos.x, pos.y, width, height);
 634     wxRect finalRect(0, 0, size.GetWidth(), size.GetHeight());
 635
 636     subRect.Intersect(finalRect);
 637
 638     if (!subRect.IsEmpty())
 639     {
 640         if ((subRect.GetWidth() == width) && (subRect.GetHeight() == height))
 641             image.Paste(*this, pos.x, pos.y);
 642         else
 643             image.Paste(GetSubImage(subRect), pos.x, pos.y);
 644     }
 645
 646     return image;
 647 }
 648
 649 void wxImage::Paste( const wxImage &image, int x, int y )
 650 {
 651     wxCHECK_RET( Ok(), wxT("invalid image") );
 652     wxCHECK_RET( image.Ok(), wxT("invalid image") );
 653
 654     int xx = 0;
 655     int yy = 0;
 656     int width = image.GetWidth();
 657     int height = image.GetHeight();
 658
 659     if (x < 0)
 660     {
 661         xx = -x;
 662         width += x;
 663     }
 664     if (y < 0)
 665     {
 666         yy = -y;
 667         height += y;
 668     }
 669
 670     if ((x+xx)+width > M_IMGDATA->m_width)
 671         width = M_IMGDATA->m_width - (x+xx);
 672     if ((y+yy)+height > M_IMGDATA->m_height)
 673         height = M_IMGDATA->m_height - (y+yy);
 674
 675     if (width < 1) return;
 676     if (height < 1) return;
 677
 678     if ((!HasMask() && !image.HasMask()) ||
 679         (HasMask() && !image.HasMask()) ||
 680        ((HasMask() && image.HasMask() &&
 681          (GetMaskRed()==image.GetMaskRed()) &&
 682          (GetMaskGreen()==image.GetMaskGreen()) &&
 683          (GetMaskBlue()==image.GetMaskBlue()))))
 684     {
 685         width *= 3;
 686         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 687         int source_step = image.GetWidth()*3;
 688
 689         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 690         int target_step = M_IMGDATA->m_width*3;
 691         for (int j = 0; j < height; j++)
 692         {
 693             memcpy( target_data, source_data, width );
 694             source_data += source_step;
 695             target_data += target_step;
 696         }
 697         return;
 698     }
 699
 700     if (!HasMask() && image.HasMask())
 701     {
 702         unsigned char r = image.GetMaskRed();
 703         unsigned char g = image.GetMaskGreen();
 704         unsigned char b = image.GetMaskBlue();
 705
 706         width *= 3;
 707         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 708         int source_step = image.GetWidth()*3;
 709
 710         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 711         int target_step = M_IMGDATA->m_width*3;
 712
 713         for (int j = 0; j < height; j++)
 714         {
 715             for (int i = 0; i < width; i+=3)
 716             {
 717                 if ((source_data[i]   != r) &&
 718                     (source_data[i+1] != g) &&
 719                     (source_data[i+2] != b))
 720                 {
 721                     memcpy( target_data+i, source_data+i, 3 );
 722                 }
 723             }
 724             source_data += source_step;
 725             target_data += target_step;
 726         }
 727     }
 728 }
 729
 730 void wxImage::Replace( unsigned char r1, unsigned char g1, unsigned char b1,
 731                        unsigned char r2, unsigned char g2, unsigned char b2 )
 732 {
 733     wxCHECK_RET( Ok(), wxT("invalid image") );
 734
 735     unsigned char *data = GetData();
 736
 737     const int w = GetWidth();
 738     const int h = GetHeight();
 739
 740     for (int j = 0; j < h; j++)
 741         for (int i = 0; i < w; i++)
 742         {
 743             if ((data[0] == r1) && (data[1] == g1) && (data[2] == b1))
 744             {
 745                 data[0] = r2;
 746                 data[1] = g2;
 747                 data[2] = b2;
 748             }
 749             data += 3;
 750         }
 751 }
 752
 753 wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const
 754 {
 755     wxImage image;
 756
 757     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 758
 759     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 760
 761     unsigned char *data = image.GetData();
 762
 763     wxCHECK_MSG( data, image, wxT("unable to create image") );
 764
 765     if (M_IMGDATA->m_hasMask)
 766     {
 767         if (M_IMGDATA->m_maskRed == r && M_IMGDATA->m_maskGreen == g &&
 768                                          M_IMGDATA->m_maskBlue == b)
 769             image.SetMaskColour( 255, 255, 255 );
 770         else
 771             image.SetMaskColour( 0, 0, 0 );
 772     }
 773
 774     long size = M_IMGDATA->m_height * M_IMGDATA->m_width;
 775
 776     unsigned char *srcd = M_IMGDATA->m_data;
 777     unsigned char *tard = image.GetData();
 778
 779     for ( long i = 0; i < size; i++, srcd += 3, tard += 3 )
 780     {
 781         if (srcd[0] == r && srcd[1] == g && srcd[2] == b)
 782             tard[0] = tard[1] = tard[2] = 255;
 783         else
 784             tard[0] = tard[1] = tard[2] = 0;
 785     }
 786
 787     return image;
 788 }
 789
 790 long wxImage::XYToIndex(int x, int y) const
 791 {
 792     if ( Ok() &&
 793             x >= 0 && y >= 0 &&
 794                 x < M_IMGDATA->m_width && y < M_IMGDATA->m_height )
 795     {
 796         return y*M_IMGDATA->m_width + x;
 797     }
 798
 799     return -1;
 800 }
 801
 802 void wxImage::SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b )
 803 {
 804     long pos = XYToIndex(x, y);
 805     wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
 806
 807     pos *= 3;
 808
 809     M_IMGDATA->m_data[ pos   ] = r;
 810     M_IMGDATA->m_data[ pos+1 ] = g;
 811     M_IMGDATA->m_data[ pos+2 ] = b;
 812 }
 813
 814 void wxImage::SetRGB( const wxRect& rect_, unsigned char r, unsigned char g, unsigned char b )
 815 {
 816     wxCHECK_RET( Ok(), wxT("invalid image") );
 817
 818     wxRect rect(rect_);
 819     wxRect imageRect(0, 0, GetWidth(), GetHeight());
 820     if ( rect == wxRect() )
 821     {
 822         rect = imageRect;
 823     }
 824     else
 825     {
 826         wxCHECK_RET( imageRect.Inside(rect.GetTopLeft()) &&
 827                      imageRect.Inside(rect.GetBottomRight()),
 828                      wxT("invalid bounding rectangle") );
 829     }
 830
 831     int x1 = rect.GetLeft(),
 832         y1 = rect.GetTop(),
 833         x2 = rect.GetRight() + 1,
 834         y2 = rect.GetBottom() + 1;
 835
 836     unsigned char *data wxDUMMY_INITIALIZE(NULL);
 837     int x, y, width = GetWidth();
 838     for (y = y1; y < y2; y++)
 839     {
 840         data = M_IMGDATA->m_data + (y*width + x1)*3;
 841         for (x = x1; x < x2; x++)
 842         {
 843             *data++ = r;
 844             *data++ = g;
 845             *data++ = b;
 846         }
 847     }
 848 }
 849
 850 unsigned char wxImage::GetRed( int x, int y ) const
 851 {
 852     long pos = XYToIndex(x, y);
 853     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
 854
 855     pos *= 3;
 856
 857     return M_IMGDATA->m_data[pos];
 858 }
 859
 860 unsigned char wxImage::GetGreen( int x, int y ) const
 861 {
 862     long pos = XYToIndex(x, y);
 863     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
 864
 865     pos *= 3;
 866
 867     return M_IMGDATA->m_data[pos+1];
 868 }
 869
 870 unsigned char wxImage::GetBlue( int x, int y ) const
 871 {
 872     long pos = XYToIndex(x, y);
 873     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
 874
 875     pos *= 3;
 876
 877     return M_IMGDATA->m_data[pos+2];
 878 }
 879
 880 bool wxImage::Ok() const
 881 {
 882     // image of 0 width or height can't be considered ok - at least because it
 883     // causes crashes in ConvertToBitmap() if we don't catch it in time
 884     wxImageRefData *data = M_IMGDATA;
 885     return data && data->m_ok && data->m_width && data->m_height;
 886 }
 887
 888 unsigned char *wxImage::GetData() const
 889 {
 890     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
 891
 892     return M_IMGDATA->m_data;
 893 }
 894
 895 void wxImage::SetData( unsigned char *data, bool static_data  )
 896 {
 897     wxCHECK_RET( Ok(), wxT("invalid image") );
 898
 899     wxImageRefData *newRefData = new wxImageRefData();
 900
 901     newRefData->m_width = M_IMGDATA->m_width;
 902     newRefData->m_height = M_IMGDATA->m_height;
 903     newRefData->m_data = data;
 904     newRefData->m_ok = true;
 905     newRefData->m_maskRed = M_IMGDATA->m_maskRed;
 906     newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
 907     newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
 908     newRefData->m_hasMask = M_IMGDATA->m_hasMask;
 909     newRefData->m_static = static_data;
 910
 911     UnRef();
 912
 913     m_refData = newRefData;
 914 }
 915
 916 void wxImage::SetData( unsigned char *data, int new_width, int new_height, bool static_data )
 917 {
 918     wxImageRefData *newRefData = new wxImageRefData();
 919
 920     if (m_refData)
 921     {
 922         newRefData->m_width = new_width;
 923         newRefData->m_height = new_height;
 924         newRefData->m_data = data;
 925         newRefData->m_ok = true;
 926         newRefData->m_maskRed = M_IMGDATA->m_maskRed;
 927         newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
 928         newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
 929         newRefData->m_hasMask = M_IMGDATA->m_hasMask;
 930     }
 931     else
 932     {
 933         newRefData->m_width = new_width;
 934         newRefData->m_height = new_height;
 935         newRefData->m_data = data;
 936         newRefData->m_ok = true;
 937     }
 938     newRefData->m_static = static_data;
 939
 940     UnRef();
 941
 942     m_refData = newRefData;
 943 }
 944
 945 // ----------------------------------------------------------------------------
 946 // alpha channel support
 947 // ----------------------------------------------------------------------------
 948
 949 void wxImage::SetAlpha(int x, int y, unsigned char alpha)
 950 {
 951     wxCHECK_RET( HasAlpha(), wxT("no alpha channel") );
 952
 953     long pos = XYToIndex(x, y);
 954     wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
 955
 956     M_IMGDATA->m_alpha[pos] = alpha;
 957 }
 958
 959 unsigned char wxImage::GetAlpha(int x, int y) const
 960 {
 961     wxCHECK_MSG( HasAlpha(), 0, wxT("no alpha channel") );
 962
 963     long pos = XYToIndex(x, y);
 964     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
 965
 966     return M_IMGDATA->m_alpha[pos];
 967 }
 968
 969 bool
 970 wxImage::ConvertColourToAlpha(unsigned char r, unsigned char g, unsigned char b)
 971 {
 972     SetAlpha(NULL);
 973
 974     const int w = M_IMGDATA->m_width;
 975     const int h = M_IMGDATA->m_height;
 976
 977     unsigned char *alpha = GetAlpha();
 978     unsigned char *data = GetData();
 979
 980     for ( int y = 0; y < h; y++ )
 981     {
 982         for ( int x = 0; x < w; x++ )
 983         {
 984             *alpha++ = *data;
 985             *data++ = r;
 986             *data++ = g;
 987             *data++ = b;
 988         }
 989     }
 990
 991     return true;
 992 }
 993
 994 void wxImage::SetAlpha( unsigned char *alpha, bool static_data )
 995 {
 996     wxCHECK_RET( Ok(), wxT("invalid image") );
 997
 998     if ( !alpha )
 999     {
1000         alpha = (unsigned char *)malloc(M_IMGDATA->m_width*M_IMGDATA->m_height);
1001     }
1002
1003     free(M_IMGDATA->m_alpha);
1004     M_IMGDATA->m_alpha = alpha;
1005     M_IMGDATA->m_staticAlpha = static_data;
1006 }
1007
1008 unsigned char *wxImage::GetAlpha() const
1009 {
1010     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
1011
1012     return M_IMGDATA->m_alpha;
1013 }
1014
1015 void wxImage::InitAlpha()
1016 {
1017     wxCHECK_RET( !HasAlpha(), wxT("image already has an alpha channel") );
1018
1019     // initialize memory for alpha channel
1020     SetAlpha();
1021
1022     unsigned char *alpha = M_IMGDATA->m_alpha;
1023     const size_t lenAlpha = M_IMGDATA->m_width * M_IMGDATA->m_height;
1024
1025     static const unsigned char ALPHA_TRANSPARENT = 0;
1026     static const unsigned char ALPHA_OPAQUE = 0xff;
1027     if ( HasMask() )
1028     {
1029         // use the mask to initialize the alpha channel.
1030         const unsigned char * const alphaEnd = alpha + lenAlpha;
1031
1032         const unsigned char mr = M_IMGDATA->m_maskRed;
1033         const unsigned char mg = M_IMGDATA->m_maskGreen;
1034         const unsigned char mb = M_IMGDATA->m_maskBlue;
1035         for ( unsigned char *src = M_IMGDATA->m_data;
1036               alpha < alphaEnd;
1037               src += 3, alpha++ )
1038         {
1039             *alpha = (src[0] == mr && src[1] == mg && src[2] == mb)
1040                             ? ALPHA_TRANSPARENT
1041                             : ALPHA_OPAQUE;
1042         }
1043
1044         M_IMGDATA->m_hasMask = false;
1045     }
1046     else // no mask
1047     {
1048         // make the image fully opaque
1049         memset(alpha, ALPHA_OPAQUE, lenAlpha);
1050     }
1051 }
1052
1053 // ----------------------------------------------------------------------------
1054 // mask support
1055 // ----------------------------------------------------------------------------
1056
1057 void wxImage::SetMaskColour( unsigned char r, unsigned char g, unsigned char b )
1058 {
1059     wxCHECK_RET( Ok(), wxT("invalid image") );
1060
1061     M_IMGDATA->m_maskRed = r;
1062     M_IMGDATA->m_maskGreen = g;
1063     M_IMGDATA->m_maskBlue = b;
1064     M_IMGDATA->m_hasMask = true;
1065 }
1066
1067 bool wxImage::GetOrFindMaskColour( unsigned char *r, unsigned char *g, unsigned char *b ) const
1068 {
1069     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1070
1071     if (M_IMGDATA->m_hasMask)
1072     {
1073         if (r) *r = M_IMGDATA->m_maskRed;
1074         if (g) *g = M_IMGDATA->m_maskGreen;
1075         if (b) *b = M_IMGDATA->m_maskBlue;
1076         return true;
1077     }
1078     else
1079     {
1080         FindFirstUnusedColour(r, g, b);
1081         return false;
1082     }
1083 }
1084
1085 unsigned char wxImage::GetMaskRed() const
1086 {
1087     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1088
1089     return M_IMGDATA->m_maskRed;
1090 }
1091
1092 unsigned char wxImage::GetMaskGreen() const
1093 {
1094     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1095
1096     return M_IMGDATA->m_maskGreen;
1097 }
1098
1099 unsigned char wxImage::GetMaskBlue() const
1100 {
1101     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1102
1103     return M_IMGDATA->m_maskBlue;
1104 }
1105
1106 void wxImage::SetMask( bool mask )
1107 {
1108     wxCHECK_RET( Ok(), wxT("invalid image") );
1109
1110     M_IMGDATA->m_hasMask = mask;
1111 }
1112
1113 bool wxImage::HasMask() const
1114 {
1115     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1116
1117     return M_IMGDATA->m_hasMask;
1118 }
1119
1120 int wxImage::GetWidth() const
1121 {
1122     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1123
1124     return M_IMGDATA->m_width;
1125 }
1126
1127 int wxImage::GetHeight() const
1128 {
1129     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1130
1131     return M_IMGDATA->m_height;
1132 }
1133
1134 bool wxImage::SetMaskFromImage(const wxImage& mask,
1135                                unsigned char mr, unsigned char mg, unsigned char mb)
1136 {
1137     // check that the images are the same size
1138     if ( (M_IMGDATA->m_height != mask.GetHeight() ) || (M_IMGDATA->m_width != mask.GetWidth () ) )
1139     {
1140         wxLogError( _("Image and mask have different sizes.") );
1141         return false;
1142     }
1143
1144     // find unused colour
1145     unsigned char r,g,b ;
1146     if (!FindFirstUnusedColour(&r, &g, &b))
1147     {
1148         wxLogError( _("No unused colour in image being masked.") );
1149         return false ;
1150     }
1151
1152     unsigned char *imgdata = GetData();
1153     unsigned char *maskdata = mask.GetData();
1154
1155     const int w = GetWidth();
1156     const int h = GetHeight();
1157
1158     for (int j = 0; j < h; j++)
1159     {
1160         for (int i = 0; i < w; i++)
1161         {
1162             if ((maskdata[0] == mr) && (maskdata[1]  == mg) && (maskdata[2] == mb))
1163             {
1164                 imgdata[0] = r;
1165                 imgdata[1] = g;
1166                 imgdata[2] = b;
1167             }
1168             imgdata  += 3;
1169             maskdata += 3;
1170         }
1171     }
1172
1173     SetMaskColour(r, g, b);
1174     SetMask(true);
1175
1176     return true;
1177 }
1178
1179 bool wxImage::ConvertAlphaToMask(unsigned char threshold)
1180 {
1181     if (!HasAlpha())
1182         return true;
1183
1184     unsigned char mr, mg, mb;
1185     if (!FindFirstUnusedColour(&mr, &mg, &mb))
1186     {
1187         wxLogError( _("No unused colour in image being masked.") );
1188         return false;
1189     }
1190
1191     SetMask(true);
1192     SetMaskColour(mr, mg, mb);
1193
1194     unsigned char *imgdata = GetData();
1195     unsigned char *alphadata = GetAlpha();
1196
1197     int w = GetWidth();
1198     int h = GetHeight();
1199
1200     for (int y = 0; y < h; y++)
1201     {
1202         for (int x = 0; x < w; x++, imgdata += 3, alphadata++)
1203         {
1204             if (*alphadata < threshold)
1205             {
1206                 imgdata[0] = mr;
1207                 imgdata[1] = mg;
1208                 imgdata[2] = mb;
1209             }
1210         }
1211     }
1212
1213     free(M_IMGDATA->m_alpha);
1214     M_IMGDATA->m_alpha = NULL;
1215
1216     return true;
1217 }
1218
1219 #if wxUSE_PALETTE
1220
1221 // Palette functions
1222
1223 bool wxImage::HasPalette() const
1224 {
1225     if (!Ok())
1226         return false;
1227
1228     return M_IMGDATA->m_palette.Ok();
1229 }
1230
1231 const wxPalette& wxImage::GetPalette() const
1232 {
1233     wxCHECK_MSG( Ok(), wxNullPalette, wxT("invalid image") );
1234
1235     return M_IMGDATA->m_palette;
1236 }
1237
1238 void wxImage::SetPalette(const wxPalette& palette)
1239 {
1240     wxCHECK_RET( Ok(), wxT("invalid image") );
1241
1242     M_IMGDATA->m_palette = palette;
1243 }
1244
1245 #endif // wxUSE_PALETTE
1246
1247 // Option functions (arbitrary name/value mapping)
1248 void wxImage::SetOption(const wxString& name, const wxString& value)
1249 {
1250     wxCHECK_RET( Ok(), wxT("invalid image") );
1251
1252     int idx = M_IMGDATA->m_optionNames.Index(name, false);
1253     if (idx == wxNOT_FOUND)
1254     {
1255         M_IMGDATA->m_optionNames.Add(name);
1256         M_IMGDATA->m_optionValues.Add(value);
1257     }
1258     else
1259     {
1260         M_IMGDATA->m_optionNames[idx] = name;
1261         M_IMGDATA->m_optionValues[idx] = value;
1262     }
1263 }
1264
1265 void wxImage::SetOption(const wxString& name, int value)
1266 {
1267     wxString valStr;
1268     valStr.Printf(wxT("%d"), value);
1269     SetOption(name, valStr);
1270 }
1271
1272 wxString wxImage::GetOption(const wxString& name) const
1273 {
1274     wxCHECK_MSG( Ok(), wxEmptyString, wxT("invalid image") );
1275
1276     int idx = M_IMGDATA->m_optionNames.Index(name, false);
1277     if (idx == wxNOT_FOUND)
1278         return wxEmptyString;
1279     else
1280         return M_IMGDATA->m_optionValues[idx];
1281 }
1282
1283 int wxImage::GetOptionInt(const wxString& name) const
1284 {
1285     return wxAtoi(GetOption(name));
1286 }
1287
1288 bool wxImage::HasOption(const wxString& name) const
1289 {
1290     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1291
1292     return (M_IMGDATA->m_optionNames.Index(name, false) != wxNOT_FOUND);
1293 }
1294
1295 bool wxImage::LoadFile( const wxString& filename, long type, int index )
1296 {
1297 #if wxUSE_STREAMS
1298     if (wxFileExists(filename))
1299     {
1300         wxFileInputStream stream(filename);
1301         wxBufferedInputStream bstream( stream );
1302         return LoadFile(bstream, type, index);
1303     }
1304     else
1305     {
1306         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
1307
1308         return false;
1309     }
1310 #else // !wxUSE_STREAMS
1311     return false;
1312 #endif // wxUSE_STREAMS
1313 }
1314
1315 bool wxImage::LoadFile( const wxString& filename, const wxString& mimetype, int index )
1316 {
1317 #if wxUSE_STREAMS
1318     if (wxFileExists(filename))
1319     {
1320         wxFileInputStream stream(filename);
1321         wxBufferedInputStream bstream( stream );
1322         return LoadFile(bstream, mimetype, index);
1323     }
1324     else
1325     {
1326         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
1327
1328         return false;
1329     }
1330 #else // !wxUSE_STREAMS
1331     return false;
1332 #endif // wxUSE_STREAMS
1333 }
1334
1335
1336
1337 bool wxImage::SaveFile( const wxString& filename ) const
1338 {
1339     wxString ext = filename.AfterLast('.').Lower();
1340
1341     wxImageHandler * pHandler = FindHandler(ext, -1);
1342     if (pHandler)
1343     {
1344         SaveFile(filename, pHandler->GetType());
1345         return true;
1346     }
1347
1348     wxLogError(_("Can't save image to file '%s': unknown extension."), filename.c_str());
1349
1350     return false;
1351 }
1352
1353 bool wxImage::SaveFile( const wxString& filename, int type ) const
1354 {
1355 #if wxUSE_STREAMS
1356     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1357
1358     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
1359
1360     wxFileOutputStream stream(filename);
1361
1362     if ( stream.IsOk() )
1363     {
1364         wxBufferedOutputStream bstream( stream );
1365         return SaveFile(bstream, type);
1366     }
1367 #endif // wxUSE_STREAMS
1368
1369     return false;
1370 }
1371
1372 bool wxImage::SaveFile( const wxString& filename, const wxString& mimetype ) const
1373 {
1374 #if wxUSE_STREAMS
1375     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1376
1377     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
1378
1379     wxFileOutputStream stream(filename);
1380
1381     if ( stream.IsOk() )
1382     {
1383         wxBufferedOutputStream bstream( stream );
1384         return SaveFile(bstream, mimetype);
1385     }
1386 #endif // wxUSE_STREAMS
1387
1388     return false;
1389 }
1390
1391 bool wxImage::CanRead( const wxString &name )
1392 {
1393 #if wxUSE_STREAMS
1394   wxFileInputStream stream(name);
1395   return CanRead(stream);
1396 #else
1397   return false;
1398 #endif
1399 }
1400
1401 int wxImage::GetImageCount( const wxString &name, long type )
1402 {
1403 #if wxUSE_STREAMS
1404   wxFileInputStream stream(name);
1405   if (stream.Ok())
1406       return GetImageCount(stream, type);
1407 #endif
1408
1409   return 0;
1410 }
1411
1412 #if wxUSE_STREAMS
1413
1414 bool wxImage::CanRead( wxInputStream &stream )
1415 {
1416     const wxList& list = GetHandlers();
1417
1418     for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
1419     {
1420         wxImageHandler *handler=(wxImageHandler*)node->GetData();
1421         if (handler->CanRead( stream ))
1422             return true;
1423     }
1424
1425     return false;
1426 }
1427
1428 int wxImage::GetImageCount( wxInputStream &stream, long type )
1429 {
1430     wxImageHandler *handler;
1431
1432     if ( type == wxBITMAP_TYPE_ANY )
1433     {
1434         wxList &list=GetHandlers();
1435
1436         for (wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext())
1437         {
1438              handler=(wxImageHandler*)node->GetData();
1439              if ( handler->CanRead(stream) )
1440                  return handler->GetImageCount(stream);
1441
1442         }
1443
1444         wxLogWarning(_("No handler found for image type."));
1445         return 0;
1446     }
1447
1448     handler = FindHandler(type);
1449
1450     if ( !handler )
1451     {
1452         wxLogWarning(_("No image handler for type %d defined."), type);
1453         return false;
1454     }
1455
1456     if ( handler->CanRead(stream) )
1457     {
1458         return handler->GetImageCount(stream);
1459     }
1460     else
1461     {
1462         wxLogError(_("Image file is not of type %d."), type);
1463         return 0;
1464     }
1465 }
1466
1467 bool wxImage::LoadFile( wxInputStream& stream, long type, int index )
1468 {
1469     UnRef();
1470
1471     m_refData = new wxImageRefData;
1472
1473     wxImageHandler *handler;
1474
1475     if ( type == wxBITMAP_TYPE_ANY )
1476     {
1477         wxList &list=GetHandlers();
1478
1479         for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
1480         {
1481              handler=(wxImageHandler*)node->GetData();
1482              if ( handler->CanRead(stream) )
1483                  return handler->LoadFile(this, stream, true/*verbose*/, index);
1484
1485         }
1486
1487         wxLogWarning( _("No handler found for image type.") );
1488         return false;
1489     }
1490
1491     handler = FindHandler(type);
1492
1493     if (handler == 0)
1494     {
1495         wxLogWarning( _("No image handler for type %d defined."), type );
1496
1497         return false;
1498     }
1499
1500     return handler->LoadFile(this, stream, true/*verbose*/, index);
1501 }
1502
1503 bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int index )
1504 {
1505     UnRef();
1506
1507     m_refData = new wxImageRefData;
1508
1509     wxImageHandler *handler = FindHandlerMime(mimetype);
1510
1511     if (handler == 0)
1512     {
1513         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1514
1515         return false;
1516     }
1517
1518     return handler->LoadFile( this, stream, true/*verbose*/, index );
1519 }
1520
1521 bool wxImage::SaveFile( wxOutputStream& stream, int type ) const
1522 {
1523     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1524
1525     wxImageHandler *handler = FindHandler(type);
1526     if ( !handler )
1527     {
1528         wxLogWarning( _("No image handler for type %d defined."), type );
1529
1530         return false;
1531     }
1532
1533     return handler->SaveFile( (wxImage*)this, stream );
1534 }
1535
1536 bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype ) const
1537 {
1538     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1539
1540     wxImageHandler *handler = FindHandlerMime(mimetype);
1541     if ( !handler )
1542     {
1543         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1544
1545         return false;
1546     }
1547
1548     return handler->SaveFile( (wxImage*)this, stream );
1549 }
1550 #endif // wxUSE_STREAMS
1551
1552 void wxImage::AddHandler( wxImageHandler *handler )
1553 {
1554     // Check for an existing handler of the type being added.
1555     if (FindHandler( handler->GetType() ) == 0)
1556     {
1557         sm_handlers.Append( handler );
1558     }
1559     else
1560     {
1561         // This is not documented behaviour, merely the simplest 'fix'
1562         // for preventing duplicate additions.  If someone ever has
1563         // a good reason to add and remove duplicate handlers (and they
1564         // may) we should probably refcount the duplicates.
1565         //   also an issue in InsertHandler below.
1566
1567         wxLogDebug( _T("Adding duplicate image handler for '%s'"),
1568                     handler->GetName().c_str() );
1569         delete handler;
1570     }
1571 }
1572
1573 void wxImage::InsertHandler( wxImageHandler *handler )
1574 {
1575     // Check for an existing handler of the type being added.
1576     if (FindHandler( handler->GetType() ) == 0)
1577     {
1578         sm_handlers.Insert( handler );
1579     }
1580     else
1581     {
1582         // see AddHandler for additional comments.
1583         wxLogDebug( _T("Inserting duplicate image handler for '%s'"),
1584                     handler->GetName().c_str() );
1585         delete handler;
1586     }
1587 }
1588
1589 bool wxImage::RemoveHandler( const wxString& name )
1590 {
1591     wxImageHandler *handler = FindHandler(name);
1592     if (handler)
1593     {
1594         sm_handlers.DeleteObject(handler);
1595         delete handler;
1596         return true;
1597     }
1598     else
1599         return false;
1600 }
1601
1602 wxImageHandler *wxImage::FindHandler( const wxString& name )
1603 {
1604     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1605     while (node)
1606     {
1607         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1608         if (handler->GetName().Cmp(name) == 0) return handler;
1609
1610         node = node->GetNext();
1611     }
1612     return 0;
1613 }
1614
1615 wxImageHandler *wxImage::FindHandler( const wxString& extension, long bitmapType )
1616 {
1617     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1618     while (node)
1619     {
1620         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1621         if ( (handler->GetExtension().Cmp(extension) == 0) &&
1622             (bitmapType == -1 || handler->GetType() == bitmapType) )
1623             return handler;
1624         node = node->GetNext();
1625     }
1626     return 0;
1627 }
1628
1629 wxImageHandler *wxImage::FindHandler( long bitmapType )
1630 {
1631     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1632     while (node)
1633     {
1634         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1635         if (handler->GetType() == bitmapType) return handler;
1636         node = node->GetNext();
1637     }
1638     return 0;
1639 }
1640
1641 wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype )
1642 {
1643     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1644     while (node)
1645     {
1646         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1647         if (handler->GetMimeType().IsSameAs(mimetype, false)) return handler;
1648         node = node->GetNext();
1649     }
1650     return 0;
1651 }
1652
1653 void wxImage::InitStandardHandlers()
1654 {
1655 #if wxUSE_STREAMS
1656     AddHandler(new wxBMPHandler);
1657 #endif // wxUSE_STREAMS
1658 }
1659
1660 void wxImage::CleanUpHandlers()
1661 {
1662     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1663     while (node)
1664     {
1665         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1666         wxList::compatibility_iterator next = node->GetNext();
1667         delete handler;
1668         node = next;
1669     }
1670
1671     sm_handlers.Clear();
1672 }
1673
1674 wxString wxImage::GetImageExtWildcard()
1675 {
1676     wxString fmts;
1677
1678     wxList& Handlers = wxImage::GetHandlers();
1679     wxList::compatibility_iterator Node = Handlers.GetFirst();
1680     while ( Node )
1681     {
1682         wxImageHandler* Handler = (wxImageHandler*)Node->GetData();
1683         fmts += wxT("*.") + Handler->GetExtension();
1684         Node = Node->GetNext();
1685         if ( Node ) fmts += wxT(";");
1686     }
1687
1688     return wxT("(") + fmts + wxT(")|") + fmts;
1689 }
1690
1691 //-----------------------------------------------------------------------------
1692 // wxImageHandler
1693 //-----------------------------------------------------------------------------
1694
1695 IMPLEMENT_ABSTRACT_CLASS(wxImageHandler,wxObject)
1696
1697 #if wxUSE_STREAMS
1698 bool wxImageHandler::LoadFile( wxImage *WXUNUSED(image), wxInputStream& WXUNUSED(stream), bool WXUNUSED(verbose), int WXUNUSED(index) )
1699 {
1700     return false;
1701 }
1702
1703 bool wxImageHandler::SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream), bool WXUNUSED(verbose) )
1704 {
1705     return false;
1706 }
1707
1708 int wxImageHandler::GetImageCount( wxInputStream& WXUNUSED(stream) )
1709 {
1710     return 1;
1711 }
1712
1713 bool wxImageHandler::CanRead( const wxString& name )
1714 {
1715     if (wxFileExists(name))
1716     {
1717         wxFileInputStream stream(name);
1718         return CanRead(stream);
1719     }
1720
1721     wxLogError( _("Can't check image format of file '%s': file does not exist."), name.c_str() );
1722
1723     return false;
1724 }
1725
1726 bool wxImageHandler::CallDoCanRead(wxInputStream& stream)
1727 {
1728     wxFileOffset posOld = stream.TellI();
1729     if ( posOld == wxInvalidOffset )
1730     {
1731         // can't test unseekable stream
1732         return false;
1733     }
1734
1735     bool ok = DoCanRead(stream);
1736
1737     // restore the old position to be able to test other formats and so on
1738     if ( stream.SeekI(posOld) == wxInvalidOffset )
1739     {
1740         wxLogDebug(_T("Failed to rewind the stream in wxImageHandler!"));
1741
1742         // reading would fail anyhow as we're not at the right position
1743         return false;
1744     }
1745
1746     return ok;
1747 }
1748
1749 #endif // wxUSE_STREAMS
1750
1751 // ----------------------------------------------------------------------------
1752 // image histogram stuff
1753 // ----------------------------------------------------------------------------
1754
1755 bool
1756 wxImageHistogram::FindFirstUnusedColour(unsigned char *r,
1757                                         unsigned char *g,
1758                                         unsigned char *b,
1759                                         unsigned char r2,
1760                                         unsigned char b2,
1761                                         unsigned char g2) const
1762 {
1763     unsigned long key = MakeKey(r2, g2, b2);
1764
1765     while ( find(key) != end() )
1766     {
1767         // color already used
1768         r2++;
1769         if ( r2 >= 255 )
1770         {
1771             r2 = 0;
1772             g2++;
1773             if ( g2 >= 255 )
1774             {
1775                 g2 = 0;
1776                 b2++;
1777                 if ( b2 >= 255 )
1778                 {
1779                     wxLogError(_("No unused colour in image.") );
1780                     return false;
1781                 }
1782             }
1783         }
1784
1785         key = MakeKey(r2, g2, b2);
1786     }
1787
1788     if ( r )
1789         *r = r2;
1790     if ( g )
1791         *g = g2;
1792     if ( b )
1793         *b = b2;
1794
1795     return true;
1796 }
1797
1798 bool
1799 wxImage::FindFirstUnusedColour(unsigned char *r,
1800                                unsigned char *g,
1801                                unsigned char *b,
1802                                unsigned char r2,
1803                                unsigned char b2,
1804                                unsigned char g2) const
1805 {
1806     wxImageHistogram histogram;
1807
1808     ComputeHistogram(histogram);
1809
1810     return histogram.FindFirstUnusedColour(r, g, b, r2, g2, b2);
1811 }
1812
1813
1814
1815 // GRG, Dic/99
1816 // Counts and returns the number of different colours. Optionally stops
1817 // when it exceeds 'stopafter' different colours. This is useful, for
1818 // example, to see if the image can be saved as 8-bit (256 colour or
1819 // less, in this case it would be invoked as CountColours(256)). Default
1820 // value for stopafter is -1 (don't care).
1821 //
1822 unsigned long wxImage::CountColours( unsigned long stopafter ) const
1823 {
1824     wxHashTable h;
1825     wxObject dummy;
1826     unsigned char r, g, b;
1827     unsigned char *p;
1828     unsigned long size, nentries, key;
1829
1830     p = GetData();
1831     size = GetWidth() * GetHeight();
1832     nentries = 0;
1833
1834     for (unsigned long j = 0; (j < size) && (nentries <= stopafter) ; j++)
1835     {
1836         r = *(p++);
1837         g = *(p++);
1838         b = *(p++);
1839         key = wxImageHistogram::MakeKey(r, g, b);
1840
1841         if (h.Get(key) == NULL)
1842         {
1843             h.Put(key, &dummy);
1844             nentries++;
1845         }
1846     }
1847
1848     return nentries;
1849 }
1850
1851
1852 unsigned long wxImage::ComputeHistogram( wxImageHistogram &h ) const
1853 {
1854     unsigned char *p = GetData();
1855     unsigned long nentries = 0;
1856
1857     h.clear();
1858
1859     const unsigned long size = GetWidth() * GetHeight();
1860
1861     unsigned char r, g, b;
1862     for ( unsigned long n = 0; n < size; n++ )
1863     {
1864         r = *p++;
1865         g = *p++;
1866         b = *p++;
1867
1868         wxImageHistogramEntry& entry = h[wxImageHistogram::MakeKey(r, g, b)];
1869
1870         if ( entry.value++ == 0 )
1871             entry.index = nentries++;
1872     }
1873
1874     return nentries;
1875 }
1876
1877 /*
1878  * Rotation code by Carlos Moreno
1879  */
1880
1881 // GRG: I've removed wxRotationPoint - we already have wxRealPoint which
1882 //      does exactly the same thing. And I also got rid of wxRotationPixel
1883 //      bacause of potential problems in architectures where alignment
1884 //      is an issue, so I had to rewrite parts of the code.
1885
1886 static const double gs_Epsilon = 1e-10;
1887
1888 static inline int wxCint (double x)
1889 {
1890     return (x > 0) ? (int) (x + 0.5) : (int) (x - 0.5);
1891 }
1892
1893
1894 // Auxiliary function to rotate a point (x,y) with respect to point p0
1895 // make it inline and use a straight return to facilitate optimization
1896 // also, the function receives the sine and cosine of the angle to avoid
1897 // repeating the time-consuming calls to these functions -- sin/cos can
1898 // be computed and stored in the calling function.
1899
1900 inline wxRealPoint rotated_point (const wxRealPoint & p, double cos_angle, double sin_angle, const wxRealPoint & p0)
1901 {
1902     return wxRealPoint (p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle,
1903                         p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle);
1904 }
1905
1906 inline wxRealPoint rotated_point (double x, double y, double cos_angle, double sin_angle, const wxRealPoint & p0)
1907 {
1908     return rotated_point (wxRealPoint(x,y), cos_angle, sin_angle, p0);
1909 }
1910
1911 wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool interpolating, wxPoint * offset_after_rotation) const
1912 {
1913     int i;
1914     angle = -angle;     // screen coordinates are a mirror image of "real" coordinates
1915
1916     bool has_alpha = HasAlpha();
1917
1918     // Create pointer-based array to accelerate access to wxImage's data
1919     unsigned char ** data = new unsigned char * [GetHeight()];
1920     data[0] = GetData();
1921     for (i = 1; i < GetHeight(); i++)
1922         data[i] = data[i - 1] + (3 * GetWidth());
1923
1924     // Same for alpha channel
1925     unsigned char ** alpha = NULL;
1926     if (has_alpha)
1927     {
1928         alpha = new unsigned char * [GetHeight()];
1929         alpha[0] = GetAlpha();
1930         for (i = 1; i < GetHeight(); i++)
1931             alpha[i] = alpha[i - 1] + GetWidth();
1932     }
1933
1934     // precompute coefficients for rotation formula
1935     // (sine and cosine of the angle)
1936     const double cos_angle = cos(angle);
1937     const double sin_angle = sin(angle);
1938
1939     // Create new Image to store the result
1940     // First, find rectangle that covers the rotated image;  to do that,
1941     // rotate the four corners
1942
1943     const wxRealPoint p0(centre_of_rotation.x, centre_of_rotation.y);
1944
1945     wxRealPoint p1 = rotated_point (0, 0, cos_angle, sin_angle, p0);
1946     wxRealPoint p2 = rotated_point (0, GetHeight(), cos_angle, sin_angle, p0);
1947     wxRealPoint p3 = rotated_point (GetWidth(), 0, cos_angle, sin_angle, p0);
1948     wxRealPoint p4 = rotated_point (GetWidth(), GetHeight(), cos_angle, sin_angle, p0);
1949
1950     int x1 = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x)));
1951     int y1 = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y)));
1952     int x2 = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x)));
1953     int y2 = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y)));
1954
1955     // Create rotated image
1956     wxImage rotated (x2 - x1 + 1, y2 - y1 + 1, false);
1957     // With alpha channel
1958     if (has_alpha)
1959         rotated.SetAlpha();
1960
1961     if (offset_after_rotation != NULL)
1962     {
1963         *offset_after_rotation = wxPoint (x1, y1);
1964     }
1965
1966     // GRG: The rotated (destination) image is always accessed
1967     //      sequentially, so there is no need for a pointer-based
1968     //      array here (and in fact it would be slower).
1969     //
1970     unsigned char * dst = rotated.GetData();
1971
1972     unsigned char * alpha_dst = NULL;
1973     if (has_alpha)
1974         alpha_dst = rotated.GetAlpha();
1975
1976     // GRG: if the original image has a mask, use its RGB values
1977     //      as the blank pixel, else, fall back to default (black).
1978     //
1979     unsigned char blank_r = 0;
1980     unsigned char blank_g = 0;
1981     unsigned char blank_b = 0;
1982
1983     if (HasMask())
1984     {
1985         blank_r = GetMaskRed();
1986         blank_g = GetMaskGreen();
1987         blank_b = GetMaskBlue();
1988         rotated.SetMaskColour( blank_r, blank_g, blank_b );
1989     }
1990
1991     // Now, for each point of the rotated image, find where it came from, by
1992     // performing an inverse rotation (a rotation of -angle) and getting the
1993     // pixel at those coordinates
1994
1995     // GRG: I've taken the (interpolating) test out of the loops, so that
1996     //      it is done only once, instead of repeating it for each pixel.
1997
1998     int x;
1999     if (interpolating)
2000     {
2001         for (int y = 0; y < rotated.GetHeight(); y++)
2002         {
2003             for (x = 0; x < rotated.GetWidth(); x++)
2004             {
2005                 wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
2006
2007                 if (-0.25 < src.x && src.x < GetWidth() - 0.75 &&
2008                     -0.25 < src.y && src.y < GetHeight() - 0.75)
2009                 {
2010                     // interpolate using the 4 enclosing grid-points.  Those
2011                     // points can be obtained using floor and ceiling of the
2012                     // exact coordinates of the point
2013                         // C.M. 2000-02-17:  when the point is near the border, special care is required.
2014
2015                     int x1, y1, x2, y2;
2016
2017                     if (0 < src.x && src.x < GetWidth() - 1)
2018                     {
2019                         x1 = wxCint(floor(src.x));
2020                         x2 = wxCint(ceil(src.x));
2021                     }
2022                     else    // else means that x is near one of the borders (0 or width-1)
2023                     {
2024                         x1 = x2 = wxCint (src.x);
2025                     }
2026
2027                     if (0 < src.y && src.y < GetHeight() - 1)
2028                     {
2029                         y1 = wxCint(floor(src.y));
2030                         y2 = wxCint(ceil(src.y));
2031                     }
2032                     else
2033                     {
2034                         y1 = y2 = wxCint (src.y);
2035                     }
2036
2037                     // get four points and the distances (square of the distance,
2038                     // for efficiency reasons) for the interpolation formula
2039
2040                     // GRG: Do not calculate the points until they are
2041                     //      really needed -- this way we can calculate
2042                     //      just one, instead of four, if d1, d2, d3
2043                     //      or d4 are < gs_Epsilon
2044
2045                     const double d1 = (src.x - x1) * (src.x - x1) + (src.y - y1) * (src.y - y1);
2046                     const double d2 = (src.x - x2) * (src.x - x2) + (src.y - y1) * (src.y - y1);
2047                     const double d3 = (src.x - x2) * (src.x - x2) + (src.y - y2) * (src.y - y2);
2048                     const double d4 = (src.x - x1) * (src.x - x1) + (src.y - y2) * (src.y - y2);
2049
2050                     // Now interpolate as a weighted average of the four surrounding
2051                     // points, where the weights are the distances to each of those points
2052
2053                     // If the point is exactly at one point of the grid of the source
2054                     // image, then don't interpolate -- just assign the pixel
2055
2056                     if (d1 < gs_Epsilon)        // d1,d2,d3,d4 are positive -- no need for abs()
2057                     {
2058                         unsigned char *p = data[y1] + (3 * x1);
2059                         *(dst++) = *(p++);
2060                         *(dst++) = *(p++);
2061                         *(dst++) = *p;
2062
2063                         if (has_alpha)
2064                         {
2065                             unsigned char *p = alpha[y1] + x1;
2066                             *(alpha_dst++) = *p;
2067                         }
2068                     }
2069                     else if (d2 < gs_Epsilon)
2070                     {
2071                         unsigned char *p = data[y1] + (3 * x2);
2072                         *(dst++) = *(p++);
2073                         *(dst++) = *(p++);
2074                         *(dst++) = *p;
2075
2076                         if (has_alpha)
2077                         {
2078                             unsigned char *p = alpha[y1] + x2;
2079                             *(alpha_dst++) = *p;
2080                         }
2081                     }
2082                     else if (d3 < gs_Epsilon)
2083                     {
2084                         unsigned char *p = data[y2] + (3 * x2);
2085                         *(dst++) = *(p++);
2086                         *(dst++) = *(p++);
2087                         *(dst++) = *p;
2088
2089                         if (has_alpha)
2090                         {
2091                             unsigned char *p = alpha[y2] + x2;
2092                             *(alpha_dst++) = *p;
2093                         }
2094                     }
2095                     else if (d4 < gs_Epsilon)
2096                     {
2097                         unsigned char *p = data[y2] + (3 * x1);
2098                         *(dst++) = *(p++);
2099                         *(dst++) = *(p++);
2100                         *(dst++) = *p;
2101
2102                         if (has_alpha)
2103                         {
2104                             unsigned char *p = alpha[y2] + x1;
2105                             *(alpha_dst++) = *p;
2106                         }
2107                     }
2108                     else
2109                     {
2110                         // weights for the weighted average are proportional to the inverse of the distance
2111                         unsigned char *v1 = data[y1] + (3 * x1);
2112                         unsigned char *v2 = data[y1] + (3 * x2);
2113                         unsigned char *v3 = data[y2] + (3 * x2);
2114                         unsigned char *v4 = data[y2] + (3 * x1);
2115
2116                         const double w1 = 1/d1, w2 = 1/d2, w3 = 1/d3, w4 = 1/d4;
2117
2118                         // GRG: Unrolled.
2119
2120                         *(dst++) = (unsigned char)
2121                             ( (w1 * *(v1++) + w2 * *(v2++) +
2122                                w3 * *(v3++) + w4 * *(v4++)) /
2123                               (w1 + w2 + w3 + w4) );
2124                         *(dst++) = (unsigned char)
2125                             ( (w1 * *(v1++) + w2 * *(v2++) +
2126                                w3 * *(v3++) + w4 * *(v4++)) /
2127                               (w1 + w2 + w3 + w4) );
2128                         *(dst++) = (unsigned char)
2129                             ( (w1 * *v1 + w2 * *v2 +
2130                                w3 * *v3 + w4 * *v4) /
2131                               (w1 + w2 + w3 + w4) );
2132
2133                         if (has_alpha)
2134                         {
2135                             unsigned char *v1 = alpha[y1] + (x1);
2136                             unsigned char *v2 = alpha[y1] + (x2);
2137                             unsigned char *v3 = alpha[y2] + (x2);
2138                             unsigned char *v4 = alpha[y2] + (x1);
2139
2140                             *(alpha_dst++) = (unsigned char)
2141                                 ( (w1 * *v1 + w2 * *v2 +
2142                                    w3 * *v3 + w4 * *v4) /
2143                                   (w1 + w2 + w3 + w4) );
2144                         }
2145                     }
2146                 }
2147                 else
2148                 {
2149                     *(dst++) = blank_r;
2150                     *(dst++) = blank_g;
2151                     *(dst++) = blank_b;
2152
2153                     if (has_alpha)
2154                         *(alpha_dst++) = 0;
2155                 }
2156             }
2157         }
2158     }
2159     else    // not interpolating
2160     {
2161         for (int y = 0; y < rotated.GetHeight(); y++)
2162         {
2163             for (x = 0; x < rotated.GetWidth(); x++)
2164             {
2165                 wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
2166
2167                 const int xs = wxCint (src.x);      // wxCint rounds to the
2168                 const int ys = wxCint (src.y);      // closest integer
2169
2170                 if (0 <= xs && xs < GetWidth() &&
2171                     0 <= ys && ys < GetHeight())
2172                 {
2173                     unsigned char *p = data[ys] + (3 * xs);
2174                     *(dst++) = *(p++);
2175                     *(dst++) = *(p++);
2176                     *(dst++) = *p;
2177
2178                     if (has_alpha)
2179                     {
2180                         unsigned char *p = alpha[ys] + (xs);
2181                         *(alpha_dst++) = *p;
2182                     }
2183                 }
2184                 else
2185                 {
2186                     *(dst++) = blank_r;
2187                     *(dst++) = blank_g;
2188                     *(dst++) = blank_b;
2189
2190                     if (has_alpha)
2191                         *(alpha_dst++) = 255;
2192                 }
2193             }
2194         }
2195     }
2196
2197     delete [] data;
2198
2199     if (has_alpha)
2200         delete [] alpha;
2201
2202     return rotated;
2203 }
2204
2205
2206
2207
2208
2209 // A module to allow wxImage initialization/cleanup
2210 // without calling these functions from app.cpp or from
2211 // the user's application.
2212
2213 class wxImageModule: public wxModule
2214 {
2215 DECLARE_DYNAMIC_CLASS(wxImageModule)
2216 public:
2217     wxImageModule() {}
2218     bool OnInit() { wxImage::InitStandardHandlers(); return true; };
2219     void OnExit() { wxImage::CleanUpHandlers(); };
2220 };
2221
2222 IMPLEMENT_DYNAMIC_CLASS(wxImageModule, wxModule)
2223
2224
2225 #endif // wxUSE_IMAGE