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 int wxImage::GetWidth() const
 791 {
 792     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 793
 794     return M_IMGDATA->m_width;
 795 }
 796
 797 int wxImage::GetHeight() const
 798 {
 799     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 800
 801     return M_IMGDATA->m_height;
 802 }
 803
 804 long wxImage::XYToIndex(int x, int y) const
 805 {
 806     if ( Ok() &&
 807             x >= 0 && y >= 0 &&
 808                 x < M_IMGDATA->m_width && y < M_IMGDATA->m_height )
 809     {
 810         return y*M_IMGDATA->m_width + x;
 811     }
 812
 813     return -1;
 814 }
 815
 816 void wxImage::SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b )
 817 {
 818     long pos = XYToIndex(x, y);
 819     wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
 820
 821     pos *= 3;
 822
 823     M_IMGDATA->m_data[ pos   ] = r;
 824     M_IMGDATA->m_data[ pos+1 ] = g;
 825     M_IMGDATA->m_data[ pos+2 ] = b;
 826 }
 827
 828 void wxImage::SetRGB( const wxRect& rect_, unsigned char r, unsigned char g, unsigned char b )
 829 {
 830     wxCHECK_RET( Ok(), wxT("invalid image") );
 831
 832     wxRect rect(rect_);
 833     wxRect imageRect(0, 0, GetWidth(), GetHeight());
 834     if ( rect == wxRect() )
 835     {
 836         rect = imageRect;
 837     }
 838     else
 839     {
 840         wxCHECK_RET( imageRect.Inside(rect.GetTopLeft()) &&
 841                      imageRect.Inside(rect.GetBottomRight()),
 842                      wxT("invalid bounding rectangle") );
 843     }
 844
 845     int x1 = rect.GetLeft(),
 846         y1 = rect.GetTop(),
 847         x2 = rect.GetRight() + 1,
 848         y2 = rect.GetBottom() + 1;
 849
 850     unsigned char *data wxDUMMY_INITIALIZE(NULL);
 851     int x, y, width = GetWidth();
 852     for (y = y1; y < y2; y++)
 853     {
 854         data = M_IMGDATA->m_data + (y*width + x1)*3;
 855         for (x = x1; x < x2; x++)
 856         {
 857             *data++ = r;
 858             *data++ = g;
 859             *data++ = b;
 860         }
 861     }
 862 }
 863
 864 unsigned char wxImage::GetRed( int x, int y ) const
 865 {
 866     long pos = XYToIndex(x, y);
 867     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
 868
 869     pos *= 3;
 870
 871     return M_IMGDATA->m_data[pos];
 872 }
 873
 874 unsigned char wxImage::GetGreen( int x, int y ) const
 875 {
 876     long pos = XYToIndex(x, y);
 877     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
 878
 879     pos *= 3;
 880
 881     return M_IMGDATA->m_data[pos+1];
 882 }
 883
 884 unsigned char wxImage::GetBlue( int x, int y ) const
 885 {
 886     long pos = XYToIndex(x, y);
 887     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
 888
 889     pos *= 3;
 890
 891     return M_IMGDATA->m_data[pos+2];
 892 }
 893
 894 bool wxImage::Ok() const
 895 {
 896     // image of 0 width or height can't be considered ok - at least because it
 897     // causes crashes in ConvertToBitmap() if we don't catch it in time
 898     wxImageRefData *data = M_IMGDATA;
 899     return data && data->m_ok && data->m_width && data->m_height;
 900 }
 901
 902 unsigned char *wxImage::GetData() const
 903 {
 904     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
 905
 906     return M_IMGDATA->m_data;
 907 }
 908
 909 void wxImage::SetData( unsigned char *data, bool static_data  )
 910 {
 911     wxCHECK_RET( Ok(), wxT("invalid image") );
 912
 913     wxImageRefData *newRefData = new wxImageRefData();
 914
 915     newRefData->m_width = M_IMGDATA->m_width;
 916     newRefData->m_height = M_IMGDATA->m_height;
 917     newRefData->m_data = data;
 918     newRefData->m_ok = true;
 919     newRefData->m_maskRed = M_IMGDATA->m_maskRed;
 920     newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
 921     newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
 922     newRefData->m_hasMask = M_IMGDATA->m_hasMask;
 923     newRefData->m_static = static_data;
 924
 925     UnRef();
 926
 927     m_refData = newRefData;
 928 }
 929
 930 void wxImage::SetData( unsigned char *data, int new_width, int new_height, bool static_data )
 931 {
 932     wxImageRefData *newRefData = new wxImageRefData();
 933
 934     if (m_refData)
 935     {
 936         newRefData->m_width = new_width;
 937         newRefData->m_height = new_height;
 938         newRefData->m_data = data;
 939         newRefData->m_ok = true;
 940         newRefData->m_maskRed = M_IMGDATA->m_maskRed;
 941         newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
 942         newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
 943         newRefData->m_hasMask = M_IMGDATA->m_hasMask;
 944     }
 945     else
 946     {
 947         newRefData->m_width = new_width;
 948         newRefData->m_height = new_height;
 949         newRefData->m_data = data;
 950         newRefData->m_ok = true;
 951     }
 952     newRefData->m_static = static_data;
 953
 954     UnRef();
 955
 956     m_refData = newRefData;
 957 }
 958
 959 // ----------------------------------------------------------------------------
 960 // alpha channel support
 961 // ----------------------------------------------------------------------------
 962
 963 void wxImage::SetAlpha(int x, int y, unsigned char alpha)
 964 {
 965     wxCHECK_RET( HasAlpha(), wxT("no alpha channel") );
 966
 967     long pos = XYToIndex(x, y);
 968     wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
 969
 970     M_IMGDATA->m_alpha[pos] = alpha;
 971 }
 972
 973 unsigned char wxImage::GetAlpha(int x, int y) const
 974 {
 975     wxCHECK_MSG( HasAlpha(), 0, wxT("no alpha channel") );
 976
 977     long pos = XYToIndex(x, y);
 978     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
 979
 980     return M_IMGDATA->m_alpha[pos];
 981 }
 982
 983 bool
 984 wxImage::ConvertColourToAlpha(unsigned char r, unsigned char g, unsigned char b)
 985 {
 986     SetAlpha(NULL);
 987
 988     const int w = M_IMGDATA->m_width;
 989     const int h = M_IMGDATA->m_height;
 990
 991     unsigned char *alpha = GetAlpha();
 992     unsigned char *data = GetData();
 993
 994     for ( int y = 0; y < h; y++ )
 995     {
 996         for ( int x = 0; x < w; x++ )
 997         {
 998             *alpha++ = *data;
 999             *data++ = r;
1000             *data++ = g;
1001             *data++ = b;
1002         }
1003     }
1004
1005     return true;
1006 }
1007
1008 void wxImage::SetAlpha( unsigned char *alpha, bool static_data )
1009 {
1010     wxCHECK_RET( Ok(), wxT("invalid image") );
1011
1012     if ( !alpha )
1013     {
1014         alpha = (unsigned char *)malloc(M_IMGDATA->m_width*M_IMGDATA->m_height);
1015     }
1016
1017     free(M_IMGDATA->m_alpha);
1018     M_IMGDATA->m_alpha = alpha;
1019     M_IMGDATA->m_staticAlpha = static_data;
1020 }
1021
1022 unsigned char *wxImage::GetAlpha() const
1023 {
1024     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
1025
1026     return M_IMGDATA->m_alpha;
1027 }
1028
1029 void wxImage::InitAlpha()
1030 {
1031     wxCHECK_RET( !HasAlpha(), wxT("image already has an alpha channel") );
1032
1033     // initialize memory for alpha channel
1034     SetAlpha();
1035
1036     unsigned char *alpha = M_IMGDATA->m_alpha;
1037     const size_t lenAlpha = M_IMGDATA->m_width * M_IMGDATA->m_height;
1038
1039     if ( HasMask() )
1040     {
1041         // use the mask to initialize the alpha channel.
1042         const unsigned char * const alphaEnd = alpha + lenAlpha;
1043
1044         const unsigned char mr = M_IMGDATA->m_maskRed;
1045         const unsigned char mg = M_IMGDATA->m_maskGreen;
1046         const unsigned char mb = M_IMGDATA->m_maskBlue;
1047         for ( unsigned char *src = M_IMGDATA->m_data;
1048               alpha < alphaEnd;
1049               src += 3, alpha++ )
1050         {
1051             *alpha = (src[0] == mr && src[1] == mg && src[2] == mb)
1052                             ? wxIMAGE_ALPHA_TRANSPARENT
1053                             : wxIMAGE_ALPHA_OPAQUE;
1054         }
1055
1056         M_IMGDATA->m_hasMask = false;
1057     }
1058     else // no mask
1059     {
1060         // make the image fully opaque
1061         memset(alpha, wxIMAGE_ALPHA_OPAQUE, lenAlpha);
1062     }
1063 }
1064
1065 // ----------------------------------------------------------------------------
1066 // mask support
1067 // ----------------------------------------------------------------------------
1068
1069 void wxImage::SetMaskColour( unsigned char r, unsigned char g, unsigned char b )
1070 {
1071     wxCHECK_RET( Ok(), wxT("invalid image") );
1072
1073     M_IMGDATA->m_maskRed = r;
1074     M_IMGDATA->m_maskGreen = g;
1075     M_IMGDATA->m_maskBlue = b;
1076     M_IMGDATA->m_hasMask = true;
1077 }
1078
1079 bool wxImage::GetOrFindMaskColour( unsigned char *r, unsigned char *g, unsigned char *b ) const
1080 {
1081     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1082
1083     if (M_IMGDATA->m_hasMask)
1084     {
1085         if (r) *r = M_IMGDATA->m_maskRed;
1086         if (g) *g = M_IMGDATA->m_maskGreen;
1087         if (b) *b = M_IMGDATA->m_maskBlue;
1088         return true;
1089     }
1090     else
1091     {
1092         FindFirstUnusedColour(r, g, b);
1093         return false;
1094     }
1095 }
1096
1097 unsigned char wxImage::GetMaskRed() const
1098 {
1099     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1100
1101     return M_IMGDATA->m_maskRed;
1102 }
1103
1104 unsigned char wxImage::GetMaskGreen() const
1105 {
1106     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1107
1108     return M_IMGDATA->m_maskGreen;
1109 }
1110
1111 unsigned char wxImage::GetMaskBlue() const
1112 {
1113     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1114
1115     return M_IMGDATA->m_maskBlue;
1116 }
1117
1118 void wxImage::SetMask( bool mask )
1119 {
1120     wxCHECK_RET( Ok(), wxT("invalid image") );
1121
1122     M_IMGDATA->m_hasMask = mask;
1123 }
1124
1125 bool wxImage::HasMask() const
1126 {
1127     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1128
1129     return M_IMGDATA->m_hasMask;
1130 }
1131
1132 bool wxImage::IsTransparent(int x, int y, unsigned char threshold) const
1133 {
1134     long pos = XYToIndex(x, y);
1135     wxCHECK_MSG( pos != -1, false, wxT("invalid image coordinates") );
1136
1137     // check mask
1138     if ( M_IMGDATA->m_hasMask )
1139     {
1140         const unsigned char *p = M_IMGDATA->m_data + 3*pos;
1141         if ( p[0] == M_IMGDATA->m_maskRed &&
1142                 p[1] == M_IMGDATA->m_maskGreen &&
1143                     p[2] == M_IMGDATA->m_maskBlue )
1144         {
1145             return true;
1146         }
1147     }
1148
1149     // then check alpha
1150     if ( M_IMGDATA->m_alpha )
1151     {
1152         if ( M_IMGDATA->m_alpha[pos] < threshold )
1153         {
1154             // transparent enough
1155             return true;
1156         }
1157     }
1158
1159     // not transparent
1160     return false;
1161 }
1162
1163 bool wxImage::SetMaskFromImage(const wxImage& mask,
1164                                unsigned char mr, unsigned char mg, unsigned char mb)
1165 {
1166     // check that the images are the same size
1167     if ( (M_IMGDATA->m_height != mask.GetHeight() ) || (M_IMGDATA->m_width != mask.GetWidth () ) )
1168     {
1169         wxLogError( _("Image and mask have different sizes.") );
1170         return false;
1171     }
1172
1173     // find unused colour
1174     unsigned char r,g,b ;
1175     if (!FindFirstUnusedColour(&r, &g, &b))
1176     {
1177         wxLogError( _("No unused colour in image being masked.") );
1178         return false ;
1179     }
1180
1181     unsigned char *imgdata = GetData();
1182     unsigned char *maskdata = mask.GetData();
1183
1184     const int w = GetWidth();
1185     const int h = GetHeight();
1186
1187     for (int j = 0; j < h; j++)
1188     {
1189         for (int i = 0; i < w; i++)
1190         {
1191             if ((maskdata[0] == mr) && (maskdata[1]  == mg) && (maskdata[2] == mb))
1192             {
1193                 imgdata[0] = r;
1194                 imgdata[1] = g;
1195                 imgdata[2] = b;
1196             }
1197             imgdata  += 3;
1198             maskdata += 3;
1199         }
1200     }
1201
1202     SetMaskColour(r, g, b);
1203     SetMask(true);
1204
1205     return true;
1206 }
1207
1208 bool wxImage::ConvertAlphaToMask(unsigned char threshold)
1209 {
1210     if (!HasAlpha())
1211         return true;
1212
1213     unsigned char mr, mg, mb;
1214     if (!FindFirstUnusedColour(&mr, &mg, &mb))
1215     {
1216         wxLogError( _("No unused colour in image being masked.") );
1217         return false;
1218     }
1219
1220     SetMask(true);
1221     SetMaskColour(mr, mg, mb);
1222
1223     unsigned char *imgdata = GetData();
1224     unsigned char *alphadata = GetAlpha();
1225
1226     int w = GetWidth();
1227     int h = GetHeight();
1228
1229     for (int y = 0; y < h; y++)
1230     {
1231         for (int x = 0; x < w; x++, imgdata += 3, alphadata++)
1232         {
1233             if (*alphadata < threshold)
1234             {
1235                 imgdata[0] = mr;
1236                 imgdata[1] = mg;
1237                 imgdata[2] = mb;
1238             }
1239         }
1240     }
1241
1242     free(M_IMGDATA->m_alpha);
1243     M_IMGDATA->m_alpha = NULL;
1244
1245     return true;
1246 }
1247
1248 // ----------------------------------------------------------------------------
1249 // Palette functions
1250 // ----------------------------------------------------------------------------
1251
1252 #if wxUSE_PALETTE
1253
1254 bool wxImage::HasPalette() const
1255 {
1256     if (!Ok())
1257         return false;
1258
1259     return M_IMGDATA->m_palette.Ok();
1260 }
1261
1262 const wxPalette& wxImage::GetPalette() const
1263 {
1264     wxCHECK_MSG( Ok(), wxNullPalette, wxT("invalid image") );
1265
1266     return M_IMGDATA->m_palette;
1267 }
1268
1269 void wxImage::SetPalette(const wxPalette& palette)
1270 {
1271     wxCHECK_RET( Ok(), wxT("invalid image") );
1272
1273     M_IMGDATA->m_palette = palette;
1274 }
1275
1276 #endif // wxUSE_PALETTE
1277
1278 // ----------------------------------------------------------------------------
1279 // Option functions (arbitrary name/value mapping)
1280 // ----------------------------------------------------------------------------
1281
1282 void wxImage::SetOption(const wxString& name, const wxString& value)
1283 {
1284     wxCHECK_RET( Ok(), wxT("invalid image") );
1285
1286     int idx = M_IMGDATA->m_optionNames.Index(name, false);
1287     if (idx == wxNOT_FOUND)
1288     {
1289         M_IMGDATA->m_optionNames.Add(name);
1290         M_IMGDATA->m_optionValues.Add(value);
1291     }
1292     else
1293     {
1294         M_IMGDATA->m_optionNames[idx] = name;
1295         M_IMGDATA->m_optionValues[idx] = value;
1296     }
1297 }
1298
1299 void wxImage::SetOption(const wxString& name, int value)
1300 {
1301     wxString valStr;
1302     valStr.Printf(wxT("%d"), value);
1303     SetOption(name, valStr);
1304 }
1305
1306 wxString wxImage::GetOption(const wxString& name) const
1307 {
1308     wxCHECK_MSG( Ok(), wxEmptyString, wxT("invalid image") );
1309
1310     int idx = M_IMGDATA->m_optionNames.Index(name, false);
1311     if (idx == wxNOT_FOUND)
1312         return wxEmptyString;
1313     else
1314         return M_IMGDATA->m_optionValues[idx];
1315 }
1316
1317 int wxImage::GetOptionInt(const wxString& name) const
1318 {
1319     return wxAtoi(GetOption(name));
1320 }
1321
1322 bool wxImage::HasOption(const wxString& name) const
1323 {
1324     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1325
1326     return (M_IMGDATA->m_optionNames.Index(name, false) != wxNOT_FOUND);
1327 }
1328
1329 // ----------------------------------------------------------------------------
1330 // image I/O
1331 // ----------------------------------------------------------------------------
1332
1333 bool wxImage::LoadFile( const wxString& filename, long type, int index )
1334 {
1335 #if wxUSE_STREAMS
1336     if (wxFileExists(filename))
1337     {
1338         wxFileInputStream stream(filename);
1339         wxBufferedInputStream bstream( stream );
1340         return LoadFile(bstream, type, index);
1341     }
1342     else
1343     {
1344         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
1345
1346         return false;
1347     }
1348 #else // !wxUSE_STREAMS
1349     return false;
1350 #endif // wxUSE_STREAMS
1351 }
1352
1353 bool wxImage::LoadFile( const wxString& filename, const wxString& mimetype, int index )
1354 {
1355 #if wxUSE_STREAMS
1356     if (wxFileExists(filename))
1357     {
1358         wxFileInputStream stream(filename);
1359         wxBufferedInputStream bstream( stream );
1360         return LoadFile(bstream, mimetype, index);
1361     }
1362     else
1363     {
1364         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
1365
1366         return false;
1367     }
1368 #else // !wxUSE_STREAMS
1369     return false;
1370 #endif // wxUSE_STREAMS
1371 }
1372
1373
1374
1375 bool wxImage::SaveFile( const wxString& filename ) const
1376 {
1377     wxString ext = filename.AfterLast('.').Lower();
1378
1379     wxImageHandler * pHandler = FindHandler(ext, -1);
1380     if (pHandler)
1381     {
1382         SaveFile(filename, pHandler->GetType());
1383         return true;
1384     }
1385
1386     wxLogError(_("Can't save image to file '%s': unknown extension."), filename.c_str());
1387
1388     return false;
1389 }
1390
1391 bool wxImage::SaveFile( const wxString& filename, int type ) const
1392 {
1393 #if wxUSE_STREAMS
1394     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1395
1396     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
1397
1398     wxFileOutputStream stream(filename);
1399
1400     if ( stream.IsOk() )
1401     {
1402         wxBufferedOutputStream bstream( stream );
1403         return SaveFile(bstream, type);
1404     }
1405 #endif // wxUSE_STREAMS
1406
1407     return false;
1408 }
1409
1410 bool wxImage::SaveFile( const wxString& filename, const wxString& mimetype ) const
1411 {
1412 #if wxUSE_STREAMS
1413     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1414
1415     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
1416
1417     wxFileOutputStream stream(filename);
1418
1419     if ( stream.IsOk() )
1420     {
1421         wxBufferedOutputStream bstream( stream );
1422         return SaveFile(bstream, mimetype);
1423     }
1424 #endif // wxUSE_STREAMS
1425
1426     return false;
1427 }
1428
1429 bool wxImage::CanRead( const wxString &name )
1430 {
1431 #if wxUSE_STREAMS
1432   wxFileInputStream stream(name);
1433   return CanRead(stream);
1434 #else
1435   return false;
1436 #endif
1437 }
1438
1439 int wxImage::GetImageCount( const wxString &name, long type )
1440 {
1441 #if wxUSE_STREAMS
1442   wxFileInputStream stream(name);
1443   if (stream.Ok())
1444       return GetImageCount(stream, type);
1445 #endif
1446
1447   return 0;
1448 }
1449
1450 #if wxUSE_STREAMS
1451
1452 bool wxImage::CanRead( wxInputStream &stream )
1453 {
1454     const wxList& list = GetHandlers();
1455
1456     for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
1457     {
1458         wxImageHandler *handler=(wxImageHandler*)node->GetData();
1459         if (handler->CanRead( stream ))
1460             return true;
1461     }
1462
1463     return false;
1464 }
1465
1466 int wxImage::GetImageCount( wxInputStream &stream, long type )
1467 {
1468     wxImageHandler *handler;
1469
1470     if ( type == wxBITMAP_TYPE_ANY )
1471     {
1472         wxList &list=GetHandlers();
1473
1474         for (wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext())
1475         {
1476              handler=(wxImageHandler*)node->GetData();
1477              if ( handler->CanRead(stream) )
1478                  return handler->GetImageCount(stream);
1479
1480         }
1481
1482         wxLogWarning(_("No handler found for image type."));
1483         return 0;
1484     }
1485
1486     handler = FindHandler(type);
1487
1488     if ( !handler )
1489     {
1490         wxLogWarning(_("No image handler for type %d defined."), type);
1491         return false;
1492     }
1493
1494     if ( handler->CanRead(stream) )
1495     {
1496         return handler->GetImageCount(stream);
1497     }
1498     else
1499     {
1500         wxLogError(_("Image file is not of type %d."), type);
1501         return 0;
1502     }
1503 }
1504
1505 bool wxImage::LoadFile( wxInputStream& stream, long type, int index )
1506 {
1507     UnRef();
1508
1509     m_refData = new wxImageRefData;
1510
1511     wxImageHandler *handler;
1512
1513     if ( type == wxBITMAP_TYPE_ANY )
1514     {
1515         wxList &list=GetHandlers();
1516
1517         for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
1518         {
1519              handler=(wxImageHandler*)node->GetData();
1520              if ( handler->CanRead(stream) )
1521                  return handler->LoadFile(this, stream, true/*verbose*/, index);
1522
1523         }
1524
1525         wxLogWarning( _("No handler found for image type.") );
1526         return false;
1527     }
1528
1529     handler = FindHandler(type);
1530
1531     if (handler == 0)
1532     {
1533         wxLogWarning( _("No image handler for type %d defined."), type );
1534
1535         return false;
1536     }
1537
1538     return handler->LoadFile(this, stream, true/*verbose*/, index);
1539 }
1540
1541 bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int index )
1542 {
1543     UnRef();
1544
1545     m_refData = new wxImageRefData;
1546
1547     wxImageHandler *handler = FindHandlerMime(mimetype);
1548
1549     if (handler == 0)
1550     {
1551         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1552
1553         return false;
1554     }
1555
1556     return handler->LoadFile( this, stream, true/*verbose*/, index );
1557 }
1558
1559 bool wxImage::SaveFile( wxOutputStream& stream, int type ) const
1560 {
1561     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1562
1563     wxImageHandler *handler = FindHandler(type);
1564     if ( !handler )
1565     {
1566         wxLogWarning( _("No image handler for type %d defined."), type );
1567
1568         return false;
1569     }
1570
1571     return handler->SaveFile( (wxImage*)this, stream );
1572 }
1573
1574 bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype ) const
1575 {
1576     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1577
1578     wxImageHandler *handler = FindHandlerMime(mimetype);
1579     if ( !handler )
1580     {
1581         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1582
1583         return false;
1584     }
1585
1586     return handler->SaveFile( (wxImage*)this, stream );
1587 }
1588 #endif // wxUSE_STREAMS
1589
1590 // ----------------------------------------------------------------------------
1591 // image I/O handlers
1592 // ----------------------------------------------------------------------------
1593
1594 void wxImage::AddHandler( wxImageHandler *handler )
1595 {
1596     // Check for an existing handler of the type being added.
1597     if (FindHandler( handler->GetType() ) == 0)
1598     {
1599         sm_handlers.Append( handler );
1600     }
1601     else
1602     {
1603         // This is not documented behaviour, merely the simplest 'fix'
1604         // for preventing duplicate additions.  If someone ever has
1605         // a good reason to add and remove duplicate handlers (and they
1606         // may) we should probably refcount the duplicates.
1607         //   also an issue in InsertHandler below.
1608
1609         wxLogDebug( _T("Adding duplicate image handler for '%s'"),
1610                     handler->GetName().c_str() );
1611         delete handler;
1612     }
1613 }
1614
1615 void wxImage::InsertHandler( wxImageHandler *handler )
1616 {
1617     // Check for an existing handler of the type being added.
1618     if (FindHandler( handler->GetType() ) == 0)
1619     {
1620         sm_handlers.Insert( handler );
1621     }
1622     else
1623     {
1624         // see AddHandler for additional comments.
1625         wxLogDebug( _T("Inserting duplicate image handler for '%s'"),
1626                     handler->GetName().c_str() );
1627         delete handler;
1628     }
1629 }
1630
1631 bool wxImage::RemoveHandler( const wxString& name )
1632 {
1633     wxImageHandler *handler = FindHandler(name);
1634     if (handler)
1635     {
1636         sm_handlers.DeleteObject(handler);
1637         delete handler;
1638         return true;
1639     }
1640     else
1641         return false;
1642 }
1643
1644 wxImageHandler *wxImage::FindHandler( const wxString& name )
1645 {
1646     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1647     while (node)
1648     {
1649         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1650         if (handler->GetName().Cmp(name) == 0) return handler;
1651
1652         node = node->GetNext();
1653     }
1654     return 0;
1655 }
1656
1657 wxImageHandler *wxImage::FindHandler( const wxString& extension, long bitmapType )
1658 {
1659     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1660     while (node)
1661     {
1662         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1663         if ( (handler->GetExtension().Cmp(extension) == 0) &&
1664             (bitmapType == -1 || handler->GetType() == bitmapType) )
1665             return handler;
1666         node = node->GetNext();
1667     }
1668     return 0;
1669 }
1670
1671 wxImageHandler *wxImage::FindHandler( long bitmapType )
1672 {
1673     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1674     while (node)
1675     {
1676         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1677         if (handler->GetType() == bitmapType) return handler;
1678         node = node->GetNext();
1679     }
1680     return 0;
1681 }
1682
1683 wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype )
1684 {
1685     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1686     while (node)
1687     {
1688         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1689         if (handler->GetMimeType().IsSameAs(mimetype, false)) return handler;
1690         node = node->GetNext();
1691     }
1692     return 0;
1693 }
1694
1695 void wxImage::InitStandardHandlers()
1696 {
1697 #if wxUSE_STREAMS
1698     AddHandler(new wxBMPHandler);
1699 #endif // wxUSE_STREAMS
1700 }
1701
1702 void wxImage::CleanUpHandlers()
1703 {
1704     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1705     while (node)
1706     {
1707         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1708         wxList::compatibility_iterator next = node->GetNext();
1709         delete handler;
1710         node = next;
1711     }
1712
1713     sm_handlers.Clear();
1714 }
1715
1716 wxString wxImage::GetImageExtWildcard()
1717 {
1718     wxString fmts;
1719
1720     wxList& Handlers = wxImage::GetHandlers();
1721     wxList::compatibility_iterator Node = Handlers.GetFirst();
1722     while ( Node )
1723     {
1724         wxImageHandler* Handler = (wxImageHandler*)Node->GetData();
1725         fmts += wxT("*.") + Handler->GetExtension();
1726         Node = Node->GetNext();
1727         if ( Node ) fmts += wxT(";");
1728     }
1729
1730     return wxT("(") + fmts + wxT(")|") + fmts;
1731 }
1732
1733 //-----------------------------------------------------------------------------
1734 // wxImageHandler
1735 //-----------------------------------------------------------------------------
1736
1737 IMPLEMENT_ABSTRACT_CLASS(wxImageHandler,wxObject)
1738
1739 #if wxUSE_STREAMS
1740 bool wxImageHandler::LoadFile( wxImage *WXUNUSED(image), wxInputStream& WXUNUSED(stream), bool WXUNUSED(verbose), int WXUNUSED(index) )
1741 {
1742     return false;
1743 }
1744
1745 bool wxImageHandler::SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream), bool WXUNUSED(verbose) )
1746 {
1747     return false;
1748 }
1749
1750 int wxImageHandler::GetImageCount( wxInputStream& WXUNUSED(stream) )
1751 {
1752     return 1;
1753 }
1754
1755 bool wxImageHandler::CanRead( const wxString& name )
1756 {
1757     if (wxFileExists(name))
1758     {
1759         wxFileInputStream stream(name);
1760         return CanRead(stream);
1761     }
1762
1763     wxLogError( _("Can't check image format of file '%s': file does not exist."), name.c_str() );
1764
1765     return false;
1766 }
1767
1768 bool wxImageHandler::CallDoCanRead(wxInputStream& stream)
1769 {
1770     wxFileOffset posOld = stream.TellI();
1771     if ( posOld == wxInvalidOffset )
1772     {
1773         // can't test unseekable stream
1774         return false;
1775     }
1776
1777     bool ok = DoCanRead(stream);
1778
1779     // restore the old position to be able to test other formats and so on
1780     if ( stream.SeekI(posOld) == wxInvalidOffset )
1781     {
1782         wxLogDebug(_T("Failed to rewind the stream in wxImageHandler!"));
1783
1784         // reading would fail anyhow as we're not at the right position
1785         return false;
1786     }
1787
1788     return ok;
1789 }
1790
1791 #endif // wxUSE_STREAMS
1792
1793 // ----------------------------------------------------------------------------
1794 // image histogram stuff
1795 // ----------------------------------------------------------------------------
1796
1797 bool
1798 wxImageHistogram::FindFirstUnusedColour(unsigned char *r,
1799                                         unsigned char *g,
1800                                         unsigned char *b,
1801                                         unsigned char r2,
1802                                         unsigned char b2,
1803                                         unsigned char g2) const
1804 {
1805     unsigned long key = MakeKey(r2, g2, b2);
1806
1807     while ( find(key) != end() )
1808     {
1809         // color already used
1810         r2++;
1811         if ( r2 >= 255 )
1812         {
1813             r2 = 0;
1814             g2++;
1815             if ( g2 >= 255 )
1816             {
1817                 g2 = 0;
1818                 b2++;
1819                 if ( b2 >= 255 )
1820                 {
1821                     wxLogError(_("No unused colour in image.") );
1822                     return false;
1823                 }
1824             }
1825         }
1826
1827         key = MakeKey(r2, g2, b2);
1828     }
1829
1830     if ( r )
1831         *r = r2;
1832     if ( g )
1833         *g = g2;
1834     if ( b )
1835         *b = b2;
1836
1837     return true;
1838 }
1839
1840 bool
1841 wxImage::FindFirstUnusedColour(unsigned char *r,
1842                                unsigned char *g,
1843                                unsigned char *b,
1844                                unsigned char r2,
1845                                unsigned char b2,
1846                                unsigned char g2) const
1847 {
1848     wxImageHistogram histogram;
1849
1850     ComputeHistogram(histogram);
1851
1852     return histogram.FindFirstUnusedColour(r, g, b, r2, g2, b2);
1853 }
1854
1855
1856
1857 // GRG, Dic/99
1858 // Counts and returns the number of different colours. Optionally stops
1859 // when it exceeds 'stopafter' different colours. This is useful, for
1860 // example, to see if the image can be saved as 8-bit (256 colour or
1861 // less, in this case it would be invoked as CountColours(256)). Default
1862 // value for stopafter is -1 (don't care).
1863 //
1864 unsigned long wxImage::CountColours( unsigned long stopafter ) const
1865 {
1866     wxHashTable h;
1867     wxObject dummy;
1868     unsigned char r, g, b;
1869     unsigned char *p;
1870     unsigned long size, nentries, key;
1871
1872     p = GetData();
1873     size = GetWidth() * GetHeight();
1874     nentries = 0;
1875
1876     for (unsigned long j = 0; (j < size) && (nentries <= stopafter) ; j++)
1877     {
1878         r = *(p++);
1879         g = *(p++);
1880         b = *(p++);
1881         key = wxImageHistogram::MakeKey(r, g, b);
1882
1883         if (h.Get(key) == NULL)
1884         {
1885             h.Put(key, &dummy);
1886             nentries++;
1887         }
1888     }
1889
1890     return nentries;
1891 }
1892
1893
1894 unsigned long wxImage::ComputeHistogram( wxImageHistogram &h ) const
1895 {
1896     unsigned char *p = GetData();
1897     unsigned long nentries = 0;
1898
1899     h.clear();
1900
1901     const unsigned long size = GetWidth() * GetHeight();
1902
1903     unsigned char r, g, b;
1904     for ( unsigned long n = 0; n < size; n++ )
1905     {
1906         r = *p++;
1907         g = *p++;
1908         b = *p++;
1909
1910         wxImageHistogramEntry& entry = h[wxImageHistogram::MakeKey(r, g, b)];
1911
1912         if ( entry.value++ == 0 )
1913             entry.index = nentries++;
1914     }
1915
1916     return nentries;
1917 }
1918
1919 /*
1920  * Rotation code by Carlos Moreno
1921  */
1922
1923 // GRG: I've removed wxRotationPoint - we already have wxRealPoint which
1924 //      does exactly the same thing. And I also got rid of wxRotationPixel
1925 //      bacause of potential problems in architectures where alignment
1926 //      is an issue, so I had to rewrite parts of the code.
1927
1928 static const double gs_Epsilon = 1e-10;
1929
1930 static inline int wxCint (double x)
1931 {
1932     return (x > 0) ? (int) (x + 0.5) : (int) (x - 0.5);
1933 }
1934
1935
1936 // Auxiliary function to rotate a point (x,y) with respect to point p0
1937 // make it inline and use a straight return to facilitate optimization
1938 // also, the function receives the sine and cosine of the angle to avoid
1939 // repeating the time-consuming calls to these functions -- sin/cos can
1940 // be computed and stored in the calling function.
1941
1942 inline wxRealPoint rotated_point (const wxRealPoint & p, double cos_angle, double sin_angle, const wxRealPoint & p0)
1943 {
1944     return wxRealPoint (p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle,
1945                         p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle);
1946 }
1947
1948 inline wxRealPoint rotated_point (double x, double y, double cos_angle, double sin_angle, const wxRealPoint & p0)
1949 {
1950     return rotated_point (wxRealPoint(x,y), cos_angle, sin_angle, p0);
1951 }
1952
1953 wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool interpolating, wxPoint * offset_after_rotation) const
1954 {
1955     int i;
1956     angle = -angle;     // screen coordinates are a mirror image of "real" coordinates
1957
1958     bool has_alpha = HasAlpha();
1959
1960     // Create pointer-based array to accelerate access to wxImage's data
1961     unsigned char ** data = new unsigned char * [GetHeight()];
1962     data[0] = GetData();
1963     for (i = 1; i < GetHeight(); i++)
1964         data[i] = data[i - 1] + (3 * GetWidth());
1965
1966     // Same for alpha channel
1967     unsigned char ** alpha = NULL;
1968     if (has_alpha)
1969     {
1970         alpha = new unsigned char * [GetHeight()];
1971         alpha[0] = GetAlpha();
1972         for (i = 1; i < GetHeight(); i++)
1973             alpha[i] = alpha[i - 1] + GetWidth();
1974     }
1975
1976     // precompute coefficients for rotation formula
1977     // (sine and cosine of the angle)
1978     const double cos_angle = cos(angle);
1979     const double sin_angle = sin(angle);
1980
1981     // Create new Image to store the result
1982     // First, find rectangle that covers the rotated image;  to do that,
1983     // rotate the four corners
1984
1985     const wxRealPoint p0(centre_of_rotation.x, centre_of_rotation.y);
1986
1987     wxRealPoint p1 = rotated_point (0, 0, cos_angle, sin_angle, p0);
1988     wxRealPoint p2 = rotated_point (0, GetHeight(), cos_angle, sin_angle, p0);
1989     wxRealPoint p3 = rotated_point (GetWidth(), 0, cos_angle, sin_angle, p0);
1990     wxRealPoint p4 = rotated_point (GetWidth(), GetHeight(), cos_angle, sin_angle, p0);
1991
1992     int x1 = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x)));
1993     int y1 = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y)));
1994     int x2 = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x)));
1995     int y2 = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y)));
1996
1997     // Create rotated image
1998     wxImage rotated (x2 - x1 + 1, y2 - y1 + 1, false);
1999     // With alpha channel
2000     if (has_alpha)
2001         rotated.SetAlpha();
2002
2003     if (offset_after_rotation != NULL)
2004     {
2005         *offset_after_rotation = wxPoint (x1, y1);
2006     }
2007
2008     // GRG: The rotated (destination) image is always accessed
2009     //      sequentially, so there is no need for a pointer-based
2010     //      array here (and in fact it would be slower).
2011     //
2012     unsigned char * dst = rotated.GetData();
2013
2014     unsigned char * alpha_dst = NULL;
2015     if (has_alpha)
2016         alpha_dst = rotated.GetAlpha();
2017
2018     // GRG: if the original image has a mask, use its RGB values
2019     //      as the blank pixel, else, fall back to default (black).
2020     //
2021     unsigned char blank_r = 0;
2022     unsigned char blank_g = 0;
2023     unsigned char blank_b = 0;
2024
2025     if (HasMask())
2026     {
2027         blank_r = GetMaskRed();
2028         blank_g = GetMaskGreen();
2029         blank_b = GetMaskBlue();
2030         rotated.SetMaskColour( blank_r, blank_g, blank_b );
2031     }
2032
2033     // Now, for each point of the rotated image, find where it came from, by
2034     // performing an inverse rotation (a rotation of -angle) and getting the
2035     // pixel at those coordinates
2036
2037     // GRG: I've taken the (interpolating) test out of the loops, so that
2038     //      it is done only once, instead of repeating it for each pixel.
2039
2040     int x;
2041     if (interpolating)
2042     {
2043         for (int y = 0; y < rotated.GetHeight(); y++)
2044         {
2045             for (x = 0; x < rotated.GetWidth(); x++)
2046             {
2047                 wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
2048
2049                 if (-0.25 < src.x && src.x < GetWidth() - 0.75 &&
2050                     -0.25 < src.y && src.y < GetHeight() - 0.75)
2051                 {
2052                     // interpolate using the 4 enclosing grid-points.  Those
2053                     // points can be obtained using floor and ceiling of the
2054                     // exact coordinates of the point
2055                         // C.M. 2000-02-17:  when the point is near the border, special care is required.
2056
2057                     int x1, y1, x2, y2;
2058
2059                     if (0 < src.x && src.x < GetWidth() - 1)
2060                     {
2061                         x1 = wxCint(floor(src.x));
2062                         x2 = wxCint(ceil(src.x));
2063                     }
2064                     else    // else means that x is near one of the borders (0 or width-1)
2065                     {
2066                         x1 = x2 = wxCint (src.x);
2067                     }
2068
2069                     if (0 < src.y && src.y < GetHeight() - 1)
2070                     {
2071                         y1 = wxCint(floor(src.y));
2072                         y2 = wxCint(ceil(src.y));
2073                     }
2074                     else
2075                     {
2076                         y1 = y2 = wxCint (src.y);
2077                     }
2078
2079                     // get four points and the distances (square of the distance,
2080                     // for efficiency reasons) for the interpolation formula
2081
2082                     // GRG: Do not calculate the points until they are
2083                     //      really needed -- this way we can calculate
2084                     //      just one, instead of four, if d1, d2, d3
2085                     //      or d4 are < gs_Epsilon
2086
2087                     const double d1 = (src.x - x1) * (src.x - x1) + (src.y - y1) * (src.y - y1);
2088                     const double d2 = (src.x - x2) * (src.x - x2) + (src.y - y1) * (src.y - y1);
2089                     const double d3 = (src.x - x2) * (src.x - x2) + (src.y - y2) * (src.y - y2);
2090                     const double d4 = (src.x - x1) * (src.x - x1) + (src.y - y2) * (src.y - y2);
2091
2092                     // Now interpolate as a weighted average of the four surrounding
2093                     // points, where the weights are the distances to each of those points
2094
2095                     // If the point is exactly at one point of the grid of the source
2096                     // image, then don't interpolate -- just assign the pixel
2097
2098                     if (d1 < gs_Epsilon)        // d1,d2,d3,d4 are positive -- no need for abs()
2099                     {
2100                         unsigned char *p = data[y1] + (3 * x1);
2101                         *(dst++) = *(p++);
2102                         *(dst++) = *(p++);
2103                         *(dst++) = *p;
2104
2105                         if (has_alpha)
2106                         {
2107                             unsigned char *p = alpha[y1] + x1;
2108                             *(alpha_dst++) = *p;
2109                         }
2110                     }
2111                     else if (d2 < gs_Epsilon)
2112                     {
2113                         unsigned char *p = data[y1] + (3 * x2);
2114                         *(dst++) = *(p++);
2115                         *(dst++) = *(p++);
2116                         *(dst++) = *p;
2117
2118                         if (has_alpha)
2119                         {
2120                             unsigned char *p = alpha[y1] + x2;
2121                             *(alpha_dst++) = *p;
2122                         }
2123                     }
2124                     else if (d3 < gs_Epsilon)
2125                     {
2126                         unsigned char *p = data[y2] + (3 * x2);
2127                         *(dst++) = *(p++);
2128                         *(dst++) = *(p++);
2129                         *(dst++) = *p;
2130
2131                         if (has_alpha)
2132                         {
2133                             unsigned char *p = alpha[y2] + x2;
2134                             *(alpha_dst++) = *p;
2135                         }
2136                     }
2137                     else if (d4 < gs_Epsilon)
2138                     {
2139                         unsigned char *p = data[y2] + (3 * x1);
2140                         *(dst++) = *(p++);
2141                         *(dst++) = *(p++);
2142                         *(dst++) = *p;
2143
2144                         if (has_alpha)
2145                         {
2146                             unsigned char *p = alpha[y2] + x1;
2147                             *(alpha_dst++) = *p;
2148                         }
2149                     }
2150                     else
2151                     {
2152                         // weights for the weighted average are proportional to the inverse of the distance
2153                         unsigned char *v1 = data[y1] + (3 * x1);
2154                         unsigned char *v2 = data[y1] + (3 * x2);
2155                         unsigned char *v3 = data[y2] + (3 * x2);
2156                         unsigned char *v4 = data[y2] + (3 * x1);
2157
2158                         const double w1 = 1/d1, w2 = 1/d2, w3 = 1/d3, w4 = 1/d4;
2159
2160                         // GRG: Unrolled.
2161
2162                         *(dst++) = (unsigned char)
2163                             ( (w1 * *(v1++) + w2 * *(v2++) +
2164                                w3 * *(v3++) + w4 * *(v4++)) /
2165                               (w1 + w2 + w3 + w4) );
2166                         *(dst++) = (unsigned char)
2167                             ( (w1 * *(v1++) + w2 * *(v2++) +
2168                                w3 * *(v3++) + w4 * *(v4++)) /
2169                               (w1 + w2 + w3 + w4) );
2170                         *(dst++) = (unsigned char)
2171                             ( (w1 * *v1 + w2 * *v2 +
2172                                w3 * *v3 + w4 * *v4) /
2173                               (w1 + w2 + w3 + w4) );
2174
2175                         if (has_alpha)
2176                         {
2177                             unsigned char *v1 = alpha[y1] + (x1);
2178                             unsigned char *v2 = alpha[y1] + (x2);
2179                             unsigned char *v3 = alpha[y2] + (x2);
2180                             unsigned char *v4 = alpha[y2] + (x1);
2181
2182                             *(alpha_dst++) = (unsigned char)
2183                                 ( (w1 * *v1 + w2 * *v2 +
2184                                    w3 * *v3 + w4 * *v4) /
2185                                   (w1 + w2 + w3 + w4) );
2186                         }
2187                     }
2188                 }
2189                 else
2190                 {
2191                     *(dst++) = blank_r;
2192                     *(dst++) = blank_g;
2193                     *(dst++) = blank_b;
2194
2195                     if (has_alpha)
2196                         *(alpha_dst++) = 0;
2197                 }
2198             }
2199         }
2200     }
2201     else    // not interpolating
2202     {
2203         for (int y = 0; y < rotated.GetHeight(); y++)
2204         {
2205             for (x = 0; x < rotated.GetWidth(); x++)
2206             {
2207                 wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
2208
2209                 const int xs = wxCint (src.x);      // wxCint rounds to the
2210                 const int ys = wxCint (src.y);      // closest integer
2211
2212                 if (0 <= xs && xs < GetWidth() &&
2213                     0 <= ys && ys < GetHeight())
2214                 {
2215                     unsigned char *p = data[ys] + (3 * xs);
2216                     *(dst++) = *(p++);
2217                     *(dst++) = *(p++);
2218                     *(dst++) = *p;
2219
2220                     if (has_alpha)
2221                     {
2222                         unsigned char *p = alpha[ys] + (xs);
2223                         *(alpha_dst++) = *p;
2224                     }
2225                 }
2226                 else
2227                 {
2228                     *(dst++) = blank_r;
2229                     *(dst++) = blank_g;
2230                     *(dst++) = blank_b;
2231
2232                     if (has_alpha)
2233                         *(alpha_dst++) = 255;
2234                 }
2235             }
2236         }
2237     }
2238
2239     delete [] data;
2240
2241     if (has_alpha)
2242         delete [] alpha;
2243
2244     return rotated;
2245 }
2246
2247
2248
2249
2250
2251 // A module to allow wxImage initialization/cleanup
2252 // without calling these functions from app.cpp or from
2253 // the user's application.
2254
2255 class wxImageModule: public wxModule
2256 {
2257 DECLARE_DYNAMIC_CLASS(wxImageModule)
2258 public:
2259     wxImageModule() {}
2260     bool OnInit() { wxImage::InitStandardHandlers(); return true; };
2261     void OnExit() { wxImage::CleanUpHandlers(); };
2262 };
2263
2264 IMPLEMENT_DYNAMIC_CLASS(wxImageModule, wxModule)
2265
2266
2267 #endif // wxUSE_IMAGE