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     bool            m_static;
  72
  73 #if wxUSE_PALETTE
  74     wxPalette       m_palette;
  75 #endif // wxUSE_PALETTE
  76
  77     wxArrayString   m_optionNames;
  78     wxArrayString   m_optionValues;
  79
  80     DECLARE_NO_COPY_CLASS(wxImageRefData)
  81 };
  82
  83 wxImageRefData::wxImageRefData()
  84 {
  85     m_width = 0;
  86     m_height = 0;
  87     m_data =
  88     m_alpha = (unsigned char *) NULL;
  89
  90     m_maskRed = 0;
  91     m_maskGreen = 0;
  92     m_maskBlue = 0;
  93     m_hasMask = false;
  94
  95     m_ok = false;
  96     m_static = false;
  97 }
  98
  99 wxImageRefData::~wxImageRefData()
 100 {
 101     if (!m_static)
 102     {
 103         free( m_data );
 104         free( m_alpha );
 105     }
 106 }
 107
 108 wxList wxImage::sm_handlers;
 109
 110 wxImage wxNullImage;
 111
 112 //-----------------------------------------------------------------------------
 113
 114 #define M_IMGDATA ((wxImageRefData *)m_refData)
 115
 116 IMPLEMENT_DYNAMIC_CLASS(wxImage, wxObject)
 117
 118 wxImage::wxImage( int width, int height, bool clear )
 119 {
 120     Create( width, height, clear );
 121 }
 122
 123 wxImage::wxImage( int width, int height, unsigned char* data, bool static_data )
 124 {
 125     Create( width, height, data, static_data );
 126 }
 127
 128 wxImage::wxImage( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data )
 129 {
 130     Create( width, height, data, alpha, static_data );
 131 }
 132
 133 wxImage::wxImage( const wxString& name, long type, int index )
 134 {
 135     LoadFile( name, type, index );
 136 }
 137
 138 wxImage::wxImage( const wxString& name, const wxString& mimetype, int index )
 139 {
 140     LoadFile( name, mimetype, index );
 141 }
 142
 143 #if wxUSE_STREAMS
 144 wxImage::wxImage( wxInputStream& stream, long type, int index )
 145 {
 146     LoadFile( stream, type, index );
 147 }
 148
 149 wxImage::wxImage( wxInputStream& stream, const wxString& mimetype, int index )
 150 {
 151     LoadFile( stream, mimetype, index );
 152 }
 153 #endif // wxUSE_STREAMS
 154
 155 wxImage::wxImage( const wxImage& image )
 156     : wxObject()
 157 {
 158     Ref(image);
 159 }
 160
 161 wxImage::wxImage( const wxImage* image )
 162 {
 163     if (image) Ref(*image);
 164 }
 165
 166 wxImage::wxImage( const char** xpmData )
 167 {
 168     Create(xpmData);
 169 }
 170
 171 wxImage::wxImage( char** xpmData )
 172 {
 173     Create((const char**) xpmData);
 174 }
 175
 176 bool wxImage::Create( const char** xpmData )
 177 {
 178 #if wxUSE_XPM
 179     UnRef();
 180
 181     wxXPMDecoder decoder;
 182     (*this) = decoder.ReadData(xpmData);
 183     return Ok();
 184 #else
 185     return false;
 186 #endif
 187 }
 188
 189 bool wxImage::Create( int width, int height, bool clear )
 190 {
 191     UnRef();
 192
 193     m_refData = new wxImageRefData();
 194
 195     M_IMGDATA->m_data = (unsigned char *) malloc( width*height*3 );
 196     if (!M_IMGDATA->m_data)
 197     {
 198         UnRef();
 199         return false;
 200     }
 201
 202     if (clear)
 203         memset(M_IMGDATA->m_data, 0, width*height*3);
 204
 205     M_IMGDATA->m_width = width;
 206     M_IMGDATA->m_height = height;
 207     M_IMGDATA->m_ok = true;
 208
 209     return true;
 210 }
 211
 212 bool wxImage::Create( int width, int height, unsigned char* data, bool static_data )
 213 {
 214     UnRef();
 215
 216     wxCHECK_MSG( data, false, _T("NULL data in wxImage::Create") );
 217
 218     m_refData = new wxImageRefData();
 219
 220     M_IMGDATA->m_data = data;
 221     M_IMGDATA->m_width = width;
 222     M_IMGDATA->m_height = height;
 223     M_IMGDATA->m_ok = true;
 224     M_IMGDATA->m_static = static_data;
 225
 226     return true;
 227 }
 228
 229 bool wxImage::Create( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data )
 230 {
 231     UnRef();
 232
 233     wxCHECK_MSG( data, false, _T("NULL data in wxImage::Create") );
 234
 235     m_refData = new wxImageRefData();
 236
 237     M_IMGDATA->m_data = data;
 238     M_IMGDATA->m_alpha = alpha;
 239     M_IMGDATA->m_width = width;
 240     M_IMGDATA->m_height = height;
 241     M_IMGDATA->m_ok = true;
 242     M_IMGDATA->m_static = static_data;
 243
 244     return true;
 245 }
 246
 247 void wxImage::Destroy()
 248 {
 249     UnRef();
 250 }
 251
 252 wxImage wxImage::Copy() const
 253 {
 254     wxImage image;
 255
 256     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 257
 258     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 259
 260     unsigned char *data = image.GetData();
 261
 262     wxCHECK_MSG( data, image, wxT("unable to create image") );
 263
 264     image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 265     image.SetMask( M_IMGDATA->m_hasMask );
 266
 267     memcpy( data, GetData(), M_IMGDATA->m_width*M_IMGDATA->m_height*3 );
 268
 269     // also copy the image options
 270     wxImageRefData *imgData = (wxImageRefData *)image.m_refData;
 271     imgData->m_optionNames = M_IMGDATA->m_optionNames;
 272     imgData->m_optionValues = M_IMGDATA->m_optionValues;
 273
 274     return image;
 275 }
 276
 277 wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const
 278 {
 279     if( xFactor == 1 && yFactor == 1 )
 280         return Copy() ;
 281
 282     wxImage image;
 283
 284     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 285
 286     // can't scale to/from 0 size
 287     wxCHECK_MSG( (xFactor > 0) && (yFactor > 0), image,
 288                  wxT("invalid new image size") );
 289
 290     long old_height = M_IMGDATA->m_height,
 291          old_width  = M_IMGDATA->m_width;
 292
 293     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 294                  wxT("invalid old image size") );
 295
 296     long width = old_width / xFactor ;
 297     long height = old_height / yFactor ;
 298
 299     image.Create( width, height, false );
 300
 301     char unsigned *data = image.GetData();
 302
 303     wxCHECK_MSG( data, image, wxT("unable to create image") );
 304
 305     bool hasMask = false ;
 306     unsigned char maskRed = 0;
 307     unsigned char maskGreen = 0;
 308     unsigned char maskBlue =0 ;
 309
 310     unsigned char *source_data = M_IMGDATA->m_data;
 311     unsigned char *target_data = data;
 312     unsigned char *source_alpha = 0 ;
 313     unsigned char *target_alpha = 0 ;
 314     if (M_IMGDATA->m_hasMask)
 315     {
 316         hasMask = true ;
 317         maskRed = M_IMGDATA->m_maskRed;
 318         maskGreen = M_IMGDATA->m_maskGreen;
 319         maskBlue =M_IMGDATA->m_maskBlue ;
 320
 321         image.SetMaskColour( M_IMGDATA->m_maskRed,
 322                              M_IMGDATA->m_maskGreen,
 323                              M_IMGDATA->m_maskBlue );
 324     }
 325     else
 326     {
 327         source_alpha = M_IMGDATA->m_alpha ;
 328         if ( source_alpha )
 329         {
 330             image.SetAlpha() ;
 331             target_alpha = image.GetAlpha() ;
 332         }
 333     }
 334
 335     for (long y = 0; y < height; y++)
 336     {
 337         for (long x = 0; x < width; x++)
 338         {
 339             unsigned long avgRed = 0 ;
 340             unsigned long avgGreen = 0;
 341             unsigned long avgBlue = 0;
 342             unsigned long avgAlpha = 0 ;
 343             unsigned long counter = 0 ;
 344             // determine average
 345             for ( int y1 = 0 ; y1 < yFactor ; ++y1 )
 346             {
 347                 long y_offset = (y * yFactor + y1) * old_width;
 348                 for ( int x1 = 0 ; x1 < xFactor ; ++x1 )
 349                 {
 350                     unsigned char *pixel = source_data + 3 * ( y_offset + x * xFactor + x1 ) ;
 351                     unsigned char red = pixel[0] ;
 352                     unsigned char green = pixel[1] ;
 353                     unsigned char blue = pixel[2] ;
 354                     unsigned char alpha = 255  ;
 355                     if ( source_alpha )
 356                         alpha = *(source_alpha + y_offset + x * xFactor + x1) ;
 357                     if ( !hasMask || red != maskRed || green != maskGreen || blue != maskBlue )
 358                     {
 359                         if ( alpha > 0 )
 360                         {
 361                             avgRed += red ;
 362                             avgGreen += green ;
 363                             avgBlue += blue ;
 364                         }
 365                         avgAlpha += alpha ;
 366                         counter++ ;
 367                     }
 368                 }
 369             }
 370             if ( counter == 0 )
 371             {
 372                 *(target_data++) = M_IMGDATA->m_maskRed ;
 373                 *(target_data++) = M_IMGDATA->m_maskGreen ;
 374                 *(target_data++) = M_IMGDATA->m_maskBlue ;
 375             }
 376             else
 377             {
 378                 if ( source_alpha )
 379                     *(target_alpha++) = (unsigned char)(avgAlpha / counter ) ;
 380                 *(target_data++) = (unsigned char)(avgRed / counter);
 381                 *(target_data++) = (unsigned char)(avgGreen / counter);
 382                 *(target_data++) = (unsigned char)(avgBlue / counter);
 383             }
 384         }
 385     }
 386
 387     // In case this is a cursor, make sure the hotspot is scalled accordingly:
 388     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
 389         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
 390                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X))/xFactor);
 391     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
 392         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
 393                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y))/yFactor);
 394
 395     return image;
 396 }
 397
 398 wxImage wxImage::Scale( int width, int height ) const
 399 {
 400     wxImage image;
 401
 402     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 403
 404     // can't scale to/from 0 size
 405     wxCHECK_MSG( (width > 0) && (height > 0), image,
 406                  wxT("invalid new image size") );
 407
 408     long old_height = M_IMGDATA->m_height,
 409          old_width  = M_IMGDATA->m_width;
 410     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 411                  wxT("invalid old image size") );
 412
 413     if ( old_width % width == 0 && old_width >= width &&
 414         old_height % height == 0 && old_height >= height )
 415     {
 416         return ShrinkBy( old_width / width , old_height / height ) ;
 417     }
 418     image.Create( width, height, false );
 419
 420     unsigned char *data = image.GetData();
 421
 422     wxCHECK_MSG( data, image, wxT("unable to create image") );
 423
 424     unsigned char *source_data = M_IMGDATA->m_data;
 425     unsigned char *target_data = data;
 426     unsigned char *source_alpha = 0 ;
 427     unsigned char *target_alpha = 0 ;
 428
 429     if (M_IMGDATA->m_hasMask)
 430     {
 431         image.SetMaskColour( M_IMGDATA->m_maskRed,
 432                              M_IMGDATA->m_maskGreen,
 433                              M_IMGDATA->m_maskBlue );
 434     }
 435     else
 436     {
 437         source_alpha = M_IMGDATA->m_alpha ;
 438         if ( source_alpha )
 439         {
 440             image.SetAlpha() ;
 441             target_alpha = image.GetAlpha() ;
 442         }
 443     }
 444
 445     long x_delta = (old_width<<16) / width;
 446     long y_delta = (old_height<<16) / height;
 447
 448     unsigned char* dest_pixel = target_data;
 449
 450     long y = 0;
 451     for ( long j = 0; j < height; j++ )
 452         {
 453         unsigned char* src_line = &source_data[(y>>16)*old_width*3];
 454         unsigned char* src_alpha_line = source_alpha ? &source_alpha[(y>>16)*old_width] : 0 ;
 455
 456         long x = 0;
 457         for ( long i = 0; i < width; i++ )
 458         {
 459              unsigned char* src_pixel = &src_line[(x>>16)*3];
 460              unsigned char* src_alpha_pixel = source_alpha ? &src_alpha_line[(x>>16)] : 0 ;
 461              dest_pixel[0] = src_pixel[0];
 462              dest_pixel[1] = src_pixel[1];
 463              dest_pixel[2] = src_pixel[2];
 464              dest_pixel += 3;
 465              if ( source_alpha )
 466                 *(target_alpha++) = *src_alpha_pixel ;
 467              x += x_delta;
 468         }
 469
 470         y += y_delta;
 471     }
 472
 473     // In case this is a cursor, make sure the hotspot is scalled accordingly:
 474     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
 475         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
 476                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X)*width)/old_width);
 477     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
 478         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
 479                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y)*height)/old_height);
 480
 481     return image;
 482 }
 483
 484 wxImage wxImage::Rotate90( bool clockwise ) const
 485 {
 486     wxImage image;
 487
 488     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 489
 490     image.Create( M_IMGDATA->m_height, M_IMGDATA->m_width, false );
 491
 492     unsigned char *data = image.GetData();
 493
 494     wxCHECK_MSG( data, image, wxT("unable to create image") );
 495
 496     if (M_IMGDATA->m_hasMask)
 497         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 498
 499     long height = M_IMGDATA->m_height;
 500     long width  = M_IMGDATA->m_width;
 501
 502     unsigned char *source_data = M_IMGDATA->m_data;
 503     unsigned char *target_data;
 504
 505     for (long j = 0; j < height; j++)
 506     {
 507         for (long i = 0; i < width; i++)
 508         {
 509             if (clockwise)
 510                 target_data = data + (((i+1)*height) - j - 1)*3;
 511             else
 512                 target_data = data + ((height*(width-1)) + j - (i*height))*3;
 513             memcpy( target_data, source_data, 3 );
 514             source_data += 3;
 515         }
 516     }
 517
 518     return image;
 519 }
 520
 521 wxImage wxImage::Mirror( bool horizontally ) const
 522 {
 523     wxImage image;
 524
 525     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 526
 527     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 528
 529     unsigned char *data = image.GetData();
 530
 531     wxCHECK_MSG( data, image, wxT("unable to create image") );
 532
 533     if (M_IMGDATA->m_hasMask)
 534         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 535
 536     long height = M_IMGDATA->m_height;
 537     long width  = M_IMGDATA->m_width;
 538
 539     unsigned char *source_data = M_IMGDATA->m_data;
 540     unsigned char *target_data;
 541
 542     if (horizontally)
 543     {
 544         for (long j = 0; j < height; j++)
 545         {
 546             data += width*3;
 547             target_data = data-3;
 548             for (long i = 0; i < width; i++)
 549             {
 550                 memcpy( target_data, source_data, 3 );
 551                 source_data += 3;
 552                 target_data -= 3;
 553             }
 554         }
 555     }
 556     else
 557     {
 558         for (long i = 0; i < height; i++)
 559         {
 560             target_data = data + 3*width*(height-1-i);
 561             memcpy( target_data, source_data, (size_t)3*width );
 562             source_data += 3*width;
 563         }
 564     }
 565
 566     return image;
 567 }
 568
 569 wxImage wxImage::GetSubImage( const wxRect &rect ) const
 570 {
 571     wxImage image;
 572
 573     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 574
 575     wxCHECK_MSG( (rect.GetLeft()>=0) && (rect.GetTop()>=0) && (rect.GetRight()<=GetWidth()) && (rect.GetBottom()<=GetHeight()),
 576                  image, wxT("invalid subimage size") );
 577
 578     int subwidth=rect.GetWidth();
 579     const int subheight=rect.GetHeight();
 580
 581     image.Create( subwidth, subheight, false );
 582
 583     unsigned char *subdata = image.GetData(), *data=GetData();
 584
 585     wxCHECK_MSG( subdata, image, wxT("unable to create image") );
 586
 587     if (M_IMGDATA->m_hasMask)
 588         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 589
 590     const int subleft=3*rect.GetLeft();
 591     const int width=3*GetWidth();
 592     subwidth*=3;
 593
 594     data+=rect.GetTop()*width+subleft;
 595
 596     for (long j = 0; j < subheight; ++j)
 597     {
 598         memcpy( subdata, data, subwidth);
 599         subdata+=subwidth;
 600         data+=width;
 601     }
 602
 603     return image;
 604 }
 605
 606 wxImage wxImage::Size( const wxSize& size, const wxPoint& pos,
 607                        int r_, int g_, int b_ ) const
 608 {
 609     wxImage image;
 610
 611     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 612     wxCHECK_MSG( (size.GetWidth() > 0) && (size.GetHeight() > 0), image, wxT("invalid size") );
 613
 614     int width = GetWidth(), height = GetHeight();
 615     image.Create(size.GetWidth(), size.GetHeight(), false);
 616
 617     unsigned char r = (unsigned char)r_;
 618     unsigned char g = (unsigned char)g_;
 619     unsigned char b = (unsigned char)b_;
 620     if ((r_ == -1) && (g_ == -1) && (b_ == -1))
 621     {
 622         GetOrFindMaskColour( &r, &g, &b );
 623         image.SetMaskColour(r, g, b);
 624     }
 625
 626     image.SetRGB(wxRect(), r, g, b);
 627
 628     wxRect subRect(pos.x, pos.y, width, height);
 629     wxRect finalRect(0, 0, size.GetWidth(), size.GetHeight());
 630
 631     subRect.Intersect(finalRect);
 632
 633     if (!subRect.IsEmpty())
 634     {
 635         if ((subRect.GetWidth() == width) && (subRect.GetHeight() == height))
 636             image.Paste(*this, pos.x, pos.y);
 637         else
 638             image.Paste(GetSubImage(subRect), pos.x, pos.y);
 639     }
 640
 641     return image;
 642 }
 643
 644 void wxImage::Paste( const wxImage &image, int x, int y )
 645 {
 646     wxCHECK_RET( Ok(), wxT("invalid image") );
 647     wxCHECK_RET( image.Ok(), wxT("invalid image") );
 648
 649     int xx = 0;
 650     int yy = 0;
 651     int width = image.GetWidth();
 652     int height = image.GetHeight();
 653
 654     if (x < 0)
 655     {
 656         xx = -x;
 657         width += x;
 658     }
 659     if (y < 0)
 660     {
 661         yy = -y;
 662         height += y;
 663     }
 664
 665     if ((x+xx)+width > M_IMGDATA->m_width)
 666         width = M_IMGDATA->m_width - (x+xx);
 667     if ((y+yy)+height > M_IMGDATA->m_height)
 668         height = M_IMGDATA->m_height - (y+yy);
 669
 670     if (width < 1) return;
 671     if (height < 1) return;
 672
 673     if ((!HasMask() && !image.HasMask()) ||
 674         (HasMask() && !image.HasMask()) ||
 675        ((HasMask() && image.HasMask() &&
 676          (GetMaskRed()==image.GetMaskRed()) &&
 677          (GetMaskGreen()==image.GetMaskGreen()) &&
 678          (GetMaskBlue()==image.GetMaskBlue()))))
 679     {
 680         width *= 3;
 681         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 682         int source_step = image.GetWidth()*3;
 683
 684         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 685         int target_step = M_IMGDATA->m_width*3;
 686         for (int j = 0; j < height; j++)
 687         {
 688             memcpy( target_data, source_data, width );
 689             source_data += source_step;
 690             target_data += target_step;
 691         }
 692         return;
 693     }
 694
 695     if (!HasMask() && image.HasMask())
 696     {
 697         unsigned char r = image.GetMaskRed();
 698         unsigned char g = image.GetMaskGreen();
 699         unsigned char b = image.GetMaskBlue();
 700
 701         width *= 3;
 702         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 703         int source_step = image.GetWidth()*3;
 704
 705         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 706         int target_step = M_IMGDATA->m_width*3;
 707
 708         for (int j = 0; j < height; j++)
 709         {
 710             for (int i = 0; i < width; i+=3)
 711             {
 712                 if ((source_data[i]   != r) &&
 713                     (source_data[i+1] != g) &&
 714                     (source_data[i+2] != b))
 715                 {
 716                     memcpy( target_data+i, source_data+i, 3 );
 717                 }
 718             }
 719             source_data += source_step;
 720             target_data += target_step;
 721         }
 722     }
 723 }
 724
 725 void wxImage::Replace( unsigned char r1, unsigned char g1, unsigned char b1,
 726                        unsigned char r2, unsigned char g2, unsigned char b2 )
 727 {
 728     wxCHECK_RET( Ok(), wxT("invalid image") );
 729
 730     unsigned char *data = GetData();
 731
 732     const int w = GetWidth();
 733     const int h = GetHeight();
 734
 735     for (int j = 0; j < h; j++)
 736         for (int i = 0; i < w; i++)
 737         {
 738             if ((data[0] == r1) && (data[1] == g1) && (data[2] == b1))
 739             {
 740                 data[0] = r2;
 741                 data[1] = g2;
 742                 data[2] = b2;
 743             }
 744             data += 3;
 745         }
 746 }
 747
 748 wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const
 749 {
 750     wxImage image;
 751
 752     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 753
 754     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 755
 756     unsigned char *data = image.GetData();
 757
 758     wxCHECK_MSG( data, image, wxT("unable to create image") );
 759
 760     if (M_IMGDATA->m_hasMask)
 761     {
 762         if (M_IMGDATA->m_maskRed == r && M_IMGDATA->m_maskGreen == g &&
 763                                          M_IMGDATA->m_maskBlue == b)
 764             image.SetMaskColour( 255, 255, 255 );
 765         else
 766             image.SetMaskColour( 0, 0, 0 );
 767     }
 768
 769     long size = M_IMGDATA->m_height * M_IMGDATA->m_width;
 770
 771     unsigned char *srcd = M_IMGDATA->m_data;
 772     unsigned char *tard = image.GetData();
 773
 774     for ( long i = 0; i < size; i++, srcd += 3, tard += 3 )
 775     {
 776         if (srcd[0] == r && srcd[1] == g && srcd[2] == b)
 777             tard[0] = tard[1] = tard[2] = 255;
 778         else
 779             tard[0] = tard[1] = tard[2] = 0;
 780     }
 781
 782     return image;
 783 }
 784
 785 void wxImage::SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b )
 786 {
 787     wxCHECK_RET( Ok(), wxT("invalid image") );
 788
 789     int w = M_IMGDATA->m_width;
 790     int h = M_IMGDATA->m_height;
 791
 792     wxCHECK_RET( (x>=0) && (y>=0) && (x<w) && (y<h), wxT("invalid image index") );
 793
 794     long pos = (y * w + x) * 3;
 795
 796     M_IMGDATA->m_data[ pos   ] = r;
 797     M_IMGDATA->m_data[ pos+1 ] = g;
 798     M_IMGDATA->m_data[ pos+2 ] = b;
 799 }
 800
 801 void wxImage::SetRGB( const wxRect& rect_, unsigned char r, unsigned char g, unsigned char b )
 802 {
 803     wxCHECK_RET( Ok(), wxT("invalid image") );
 804
 805     wxRect rect(rect_);
 806     wxRect imageRect(0, 0, GetWidth(), GetHeight());
 807     if ( rect == wxRect() )
 808     {
 809         rect = imageRect;
 810     }
 811     else
 812     {
 813         wxCHECK_RET( imageRect.Inside(rect.GetTopLeft()) &&
 814                      imageRect.Inside(rect.GetBottomRight()),
 815                      wxT("invalid bounding rectangle") );
 816     }
 817
 818     int x1 = rect.GetLeft(),
 819         y1 = rect.GetTop(),
 820         x2 = rect.GetRight() + 1,
 821         y2 = rect.GetBottom() + 1;
 822
 823     unsigned char *data wxDUMMY_INITIALIZE(NULL);
 824     int x, y, width = GetWidth();
 825     for (y = y1; y < y2; y++)
 826     {
 827         data = M_IMGDATA->m_data + (y*width + x1)*3;
 828         for (x = x1; x < x2; x++)
 829         {
 830             *data++ = r;
 831             *data++ = g;
 832             *data++ = b;
 833         }
 834     }
 835 }
 836
 837 unsigned char wxImage::GetRed( int x, int y ) const
 838 {
 839     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 840
 841     int w = M_IMGDATA->m_width;
 842     int h = M_IMGDATA->m_height;
 843
 844     wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
 845
 846     long pos = (y * w + x) * 3;
 847
 848     return M_IMGDATA->m_data[pos];
 849 }
 850
 851 unsigned char wxImage::GetGreen( int x, int y ) const
 852 {
 853     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 854
 855     int w = M_IMGDATA->m_width;
 856     int h = M_IMGDATA->m_height;
 857
 858     wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
 859
 860     long pos = (y * w + x) * 3;
 861
 862     return M_IMGDATA->m_data[pos+1];
 863 }
 864
 865 unsigned char wxImage::GetBlue( int x, int y ) const
 866 {
 867     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 868
 869     int w = M_IMGDATA->m_width;
 870     int h = M_IMGDATA->m_height;
 871
 872     wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
 873
 874     long pos = (y * w + x) * 3;
 875
 876     return M_IMGDATA->m_data[pos+2];
 877 }
 878
 879 bool wxImage::Ok() const
 880 {
 881     // image of 0 width or height can't be considered ok - at least because it
 882     // causes crashes in ConvertToBitmap() if we don't catch it in time
 883     wxImageRefData *data = M_IMGDATA;
 884     return data && data->m_ok && data->m_width && data->m_height;
 885 }
 886
 887 unsigned char *wxImage::GetData() const
 888 {
 889     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
 890
 891     return M_IMGDATA->m_data;
 892 }
 893
 894 void wxImage::SetData( unsigned char *data, bool static_data  )
 895 {
 896     wxCHECK_RET( Ok(), wxT("invalid image") );
 897
 898     wxImageRefData *newRefData = new wxImageRefData();
 899
 900     newRefData->m_width = M_IMGDATA->m_width;
 901     newRefData->m_height = M_IMGDATA->m_height;
 902     newRefData->m_data = data;
 903     newRefData->m_ok = true;
 904     newRefData->m_maskRed = M_IMGDATA->m_maskRed;
 905     newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
 906     newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
 907     newRefData->m_hasMask = M_IMGDATA->m_hasMask;
 908     newRefData->m_static = static_data;
 909
 910     UnRef();
 911
 912     m_refData = newRefData;
 913 }
 914
 915 void wxImage::SetData( unsigned char *data, int new_width, int new_height, bool static_data )
 916 {
 917     wxImageRefData *newRefData = new wxImageRefData();
 918
 919     if (m_refData)
 920     {
 921         newRefData->m_width = new_width;
 922         newRefData->m_height = new_height;
 923         newRefData->m_data = data;
 924         newRefData->m_ok = true;
 925         newRefData->m_maskRed = M_IMGDATA->m_maskRed;
 926         newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
 927         newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
 928         newRefData->m_hasMask = M_IMGDATA->m_hasMask;
 929     }
 930     else
 931     {
 932         newRefData->m_width = new_width;
 933         newRefData->m_height = new_height;
 934         newRefData->m_data = data;
 935         newRefData->m_ok = true;
 936     }
 937     newRefData->m_static = static_data;
 938
 939     UnRef();
 940
 941     m_refData = newRefData;
 942 }
 943
 944 // ----------------------------------------------------------------------------
 945 // alpha channel support
 946 // ----------------------------------------------------------------------------
 947
 948 void wxImage::SetAlpha(int x, int y, unsigned char alpha)
 949 {
 950     wxCHECK_RET( Ok() && HasAlpha(), wxT("invalid image or no alpha channel") );
 951
 952     int w = M_IMGDATA->m_width,
 953         h = M_IMGDATA->m_height;
 954
 955     wxCHECK_RET( x >=0 && y >= 0 && x < w && y < h, wxT("invalid image index") );
 956
 957     M_IMGDATA->m_alpha[y*w + x] = alpha;
 958 }
 959
 960 unsigned char wxImage::GetAlpha(int x, int y) const
 961 {
 962     wxCHECK_MSG( Ok() && HasAlpha(), 0, wxT("invalid image or no alpha channel") );
 963
 964     int w = M_IMGDATA->m_width,
 965         h = M_IMGDATA->m_height;
 966
 967     wxCHECK_MSG( x >=0 && y >= 0 && x < w && y < h, 0, wxT("invalid image index") );
 968
 969     return M_IMGDATA->m_alpha[y*w + x];
 970 }
 971
 972 bool wxImage::ConvertColourToAlpha( unsigned char r, unsigned char g, unsigned char b )
 973 {
 974     SetAlpha( NULL );
 975
 976     int w = M_IMGDATA->m_width,
 977         h = M_IMGDATA->m_height;
 978
 979     unsigned char *alpha = GetAlpha();
 980     unsigned char *data = GetData();
 981
 982     int x,y;
 983     for (y = 0; y < h; y++)
 984         for (x = 0; x < w; x++)
 985             {
 986                 *alpha = *data;
 987                 alpha++;
 988                 *data = r;
 989                 data++;
 990                 *data = g;
 991                 data++;
 992                 *data = b;
 993                 data++;
 994             }
 995
 996     return true;
 997 }
 998
 999 void wxImage::SetAlpha( unsigned char *alpha, bool static_data )
1000 {
1001     wxCHECK_RET( Ok(), wxT("invalid image") );
1002
1003     if ( !alpha )
1004     {
1005         alpha = (unsigned char *)malloc(M_IMGDATA->m_width*M_IMGDATA->m_height);
1006     }
1007
1008     free(M_IMGDATA->m_alpha);
1009     M_IMGDATA->m_alpha = alpha;
1010     M_IMGDATA->m_static = static_data;
1011
1012 }
1013
1014 unsigned char *wxImage::GetAlpha() const
1015 {
1016     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
1017
1018     return M_IMGDATA->m_alpha;
1019 }
1020
1021 void wxImage::InitAlpha()
1022 {
1023     wxCHECK_RET( !HasAlpha(), wxT("image already has an alpha channel") );
1024
1025     // initialize memory for alpha channel
1026     SetAlpha();
1027
1028     unsigned char *alpha = M_IMGDATA->m_alpha;
1029     const size_t lenAlpha = M_IMGDATA->m_width * M_IMGDATA->m_height;
1030
1031     static const unsigned char ALPHA_TRANSPARENT = 0;
1032     static const unsigned char ALPHA_OPAQUE = 0xff;
1033     if ( HasMask() )
1034     {
1035         // use the mask to initialize the alpha channel.
1036         const unsigned char * const alphaEnd = alpha + lenAlpha;
1037
1038         const unsigned char mr = M_IMGDATA->m_maskRed;
1039         const unsigned char mg = M_IMGDATA->m_maskGreen;
1040         const unsigned char mb = M_IMGDATA->m_maskBlue;
1041         for ( unsigned char *src = M_IMGDATA->m_data;
1042               alpha < alphaEnd;
1043               src += 3, alpha++ )
1044         {
1045             *alpha = (src[0] == mr && src[1] == mg && src[2] == mb)
1046                             ? ALPHA_TRANSPARENT
1047                             : ALPHA_OPAQUE;
1048         }
1049
1050         M_IMGDATA->m_hasMask = false;
1051     }
1052     else // no mask
1053     {
1054         // make the image fully opaque
1055         memset(alpha, ALPHA_OPAQUE, lenAlpha);
1056     }
1057 }
1058
1059 // ----------------------------------------------------------------------------
1060 // mask support
1061 // ----------------------------------------------------------------------------
1062
1063 void wxImage::SetMaskColour( unsigned char r, unsigned char g, unsigned char b )
1064 {
1065     wxCHECK_RET( Ok(), wxT("invalid image") );
1066
1067     M_IMGDATA->m_maskRed = r;
1068     M_IMGDATA->m_maskGreen = g;
1069     M_IMGDATA->m_maskBlue = b;
1070     M_IMGDATA->m_hasMask = true;
1071 }
1072
1073 bool wxImage::GetOrFindMaskColour( unsigned char *r, unsigned char *g, unsigned char *b ) const
1074 {
1075     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1076
1077     if (M_IMGDATA->m_hasMask)
1078     {
1079         if (r) *r = M_IMGDATA->m_maskRed;
1080         if (g) *g = M_IMGDATA->m_maskGreen;
1081         if (b) *b = M_IMGDATA->m_maskBlue;
1082         return true;
1083     }
1084     else
1085     {
1086         FindFirstUnusedColour(r, g, b);
1087         return false;
1088     }
1089 }
1090
1091 unsigned char wxImage::GetMaskRed() const
1092 {
1093     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1094
1095     return M_IMGDATA->m_maskRed;
1096 }
1097
1098 unsigned char wxImage::GetMaskGreen() const
1099 {
1100     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1101
1102     return M_IMGDATA->m_maskGreen;
1103 }
1104
1105 unsigned char wxImage::GetMaskBlue() const
1106 {
1107     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1108
1109     return M_IMGDATA->m_maskBlue;
1110 }
1111
1112 void wxImage::SetMask( bool mask )
1113 {
1114     wxCHECK_RET( Ok(), wxT("invalid image") );
1115
1116     M_IMGDATA->m_hasMask = mask;
1117 }
1118
1119 bool wxImage::HasMask() const
1120 {
1121     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1122
1123     return M_IMGDATA->m_hasMask;
1124 }
1125
1126 int wxImage::GetWidth() const
1127 {
1128     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1129
1130     return M_IMGDATA->m_width;
1131 }
1132
1133 int wxImage::GetHeight() const
1134 {
1135     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1136
1137     return M_IMGDATA->m_height;
1138 }
1139
1140 bool wxImage::SetMaskFromImage(const wxImage& mask,
1141                                unsigned char mr, unsigned char mg, unsigned char mb)
1142 {
1143     // check that the images are the same size
1144     if ( (M_IMGDATA->m_height != mask.GetHeight() ) || (M_IMGDATA->m_width != mask.GetWidth () ) )
1145     {
1146         wxLogError( _("Image and mask have different sizes.") );
1147         return false;
1148     }
1149
1150     // find unused colour
1151     unsigned char r,g,b ;
1152     if (!FindFirstUnusedColour(&r, &g, &b))
1153     {
1154         wxLogError( _("No unused colour in image being masked.") );
1155         return false ;
1156     }
1157
1158     unsigned char *imgdata = GetData();
1159     unsigned char *maskdata = mask.GetData();
1160
1161     const int w = GetWidth();
1162     const int h = GetHeight();
1163
1164     for (int j = 0; j < h; j++)
1165     {
1166         for (int i = 0; i < w; i++)
1167         {
1168             if ((maskdata[0] == mr) && (maskdata[1]  == mg) && (maskdata[2] == mb))
1169             {
1170                 imgdata[0] = r;
1171                 imgdata[1] = g;
1172                 imgdata[2] = b;
1173             }
1174             imgdata  += 3;
1175             maskdata += 3;
1176         }
1177     }
1178
1179     SetMaskColour(r, g, b);
1180     SetMask(true);
1181
1182     return true;
1183 }
1184
1185 bool wxImage::ConvertAlphaToMask(unsigned char threshold)
1186 {
1187     if (!HasAlpha())
1188         return true;
1189
1190     unsigned char mr, mg, mb;
1191     if (!FindFirstUnusedColour(&mr, &mg, &mb))
1192     {
1193         wxLogError( _("No unused colour in image being masked.") );
1194         return false;
1195     }
1196
1197     SetMask(true);
1198     SetMaskColour(mr, mg, mb);
1199
1200     unsigned char *imgdata = GetData();
1201     unsigned char *alphadata = GetAlpha();
1202
1203     int w = GetWidth();
1204     int h = GetHeight();
1205
1206     for (int y = 0; y < h; y++)
1207     {
1208         for (int x = 0; x < w; x++, imgdata += 3, alphadata++)
1209         {
1210             if (*alphadata < threshold)
1211             {
1212                 imgdata[0] = mr;
1213                 imgdata[1] = mg;
1214                 imgdata[2] = mb;
1215             }
1216         }
1217     }
1218
1219     free(M_IMGDATA->m_alpha);
1220     M_IMGDATA->m_alpha = NULL;
1221
1222     return true;
1223 }
1224
1225 #if wxUSE_PALETTE
1226
1227 // Palette functions
1228
1229 bool wxImage::HasPalette() const
1230 {
1231     if (!Ok())
1232         return false;
1233
1234     return M_IMGDATA->m_palette.Ok();
1235 }
1236
1237 const wxPalette& wxImage::GetPalette() const
1238 {
1239     wxCHECK_MSG( Ok(), wxNullPalette, wxT("invalid image") );
1240
1241     return M_IMGDATA->m_palette;
1242 }
1243
1244 void wxImage::SetPalette(const wxPalette& palette)
1245 {
1246     wxCHECK_RET( Ok(), wxT("invalid image") );
1247
1248     M_IMGDATA->m_palette = palette;
1249 }
1250
1251 #endif // wxUSE_PALETTE
1252
1253 // Option functions (arbitrary name/value mapping)
1254 void wxImage::SetOption(const wxString& name, const wxString& value)
1255 {
1256     wxCHECK_RET( Ok(), wxT("invalid image") );
1257
1258     int idx = M_IMGDATA->m_optionNames.Index(name, false);
1259     if (idx == wxNOT_FOUND)
1260     {
1261         M_IMGDATA->m_optionNames.Add(name);
1262         M_IMGDATA->m_optionValues.Add(value);
1263     }
1264     else
1265     {
1266         M_IMGDATA->m_optionNames[idx] = name;
1267         M_IMGDATA->m_optionValues[idx] = value;
1268     }
1269 }
1270
1271 void wxImage::SetOption(const wxString& name, int value)
1272 {
1273     wxString valStr;
1274     valStr.Printf(wxT("%d"), value);
1275     SetOption(name, valStr);
1276 }
1277
1278 wxString wxImage::GetOption(const wxString& name) const
1279 {
1280     wxCHECK_MSG( Ok(), wxEmptyString, wxT("invalid image") );
1281
1282     int idx = M_IMGDATA->m_optionNames.Index(name, false);
1283     if (idx == wxNOT_FOUND)
1284         return wxEmptyString;
1285     else
1286         return M_IMGDATA->m_optionValues[idx];
1287 }
1288
1289 int wxImage::GetOptionInt(const wxString& name) const
1290 {
1291     return wxAtoi(GetOption(name));
1292 }
1293
1294 bool wxImage::HasOption(const wxString& name) const
1295 {
1296     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1297
1298     return (M_IMGDATA->m_optionNames.Index(name, false) != wxNOT_FOUND);
1299 }
1300
1301 bool wxImage::LoadFile( const wxString& filename, long type, int index )
1302 {
1303 #if wxUSE_STREAMS
1304     if (wxFileExists(filename))
1305     {
1306         wxFileInputStream stream(filename);
1307         wxBufferedInputStream bstream( stream );
1308         return LoadFile(bstream, type, index);
1309     }
1310     else
1311     {
1312         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
1313
1314         return false;
1315     }
1316 #else // !wxUSE_STREAMS
1317     return false;
1318 #endif // wxUSE_STREAMS
1319 }
1320
1321 bool wxImage::LoadFile( const wxString& filename, const wxString& mimetype, int index )
1322 {
1323 #if wxUSE_STREAMS
1324     if (wxFileExists(filename))
1325     {
1326         wxFileInputStream stream(filename);
1327         wxBufferedInputStream bstream( stream );
1328         return LoadFile(bstream, mimetype, index);
1329     }
1330     else
1331     {
1332         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
1333
1334         return false;
1335     }
1336 #else // !wxUSE_STREAMS
1337     return false;
1338 #endif // wxUSE_STREAMS
1339 }
1340
1341
1342
1343 bool wxImage::SaveFile( const wxString& filename ) const
1344 {
1345     wxString ext = filename.AfterLast('.').Lower();
1346
1347     wxImageHandler * pHandler = FindHandler(ext, -1);
1348     if (pHandler)
1349     {
1350         SaveFile(filename, pHandler->GetType());
1351         return true;
1352     }
1353
1354     wxLogError(_("Can't save image to file '%s': unknown extension."), filename.c_str());
1355
1356     return false;
1357 }
1358
1359 bool wxImage::SaveFile( const wxString& filename, int type ) const
1360 {
1361 #if wxUSE_STREAMS
1362     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1363
1364     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
1365
1366     wxFileOutputStream stream(filename);
1367
1368     if ( stream.IsOk() )
1369     {
1370         wxBufferedOutputStream bstream( stream );
1371         return SaveFile(bstream, type);
1372     }
1373 #endif // wxUSE_STREAMS
1374
1375     return false;
1376 }
1377
1378 bool wxImage::SaveFile( const wxString& filename, const wxString& mimetype ) const
1379 {
1380 #if wxUSE_STREAMS
1381     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1382
1383     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
1384
1385     wxFileOutputStream stream(filename);
1386
1387     if ( stream.IsOk() )
1388     {
1389         wxBufferedOutputStream bstream( stream );
1390         return SaveFile(bstream, mimetype);
1391     }
1392 #endif // wxUSE_STREAMS
1393
1394     return false;
1395 }
1396
1397 bool wxImage::CanRead( const wxString &name )
1398 {
1399 #if wxUSE_STREAMS
1400   wxFileInputStream stream(name);
1401   return CanRead(stream);
1402 #else
1403   return false;
1404 #endif
1405 }
1406
1407 int wxImage::GetImageCount( const wxString &name, long type )
1408 {
1409 #if wxUSE_STREAMS
1410   wxFileInputStream stream(name);
1411   if (stream.Ok())
1412       return GetImageCount(stream, type);
1413 #endif
1414
1415   return 0;
1416 }
1417
1418 #if wxUSE_STREAMS
1419
1420 bool wxImage::CanRead( wxInputStream &stream )
1421 {
1422     const wxList& list = GetHandlers();
1423
1424     for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
1425     {
1426         wxImageHandler *handler=(wxImageHandler*)node->GetData();
1427         if (handler->CanRead( stream ))
1428             return true;
1429     }
1430
1431     return false;
1432 }
1433
1434 int wxImage::GetImageCount( wxInputStream &stream, long type )
1435 {
1436     wxImageHandler *handler;
1437
1438     if ( type == wxBITMAP_TYPE_ANY )
1439     {
1440         wxList &list=GetHandlers();
1441
1442         for (wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext())
1443         {
1444              handler=(wxImageHandler*)node->GetData();
1445              if ( handler->CanRead(stream) )
1446                  return handler->GetImageCount(stream);
1447
1448         }
1449
1450         wxLogWarning(_("No handler found for image type."));
1451         return 0;
1452     }
1453
1454     handler = FindHandler(type);
1455
1456     if ( !handler )
1457     {
1458         wxLogWarning(_("No image handler for type %d defined."), type);
1459         return false;
1460     }
1461
1462     if ( handler->CanRead(stream) )
1463     {
1464         return handler->GetImageCount(stream);
1465     }
1466     else
1467     {
1468         wxLogError(_("Image file is not of type %d."), type);
1469         return 0;
1470     }
1471 }
1472
1473 bool wxImage::LoadFile( wxInputStream& stream, long type, int index )
1474 {
1475     UnRef();
1476
1477     m_refData = new wxImageRefData;
1478
1479     wxImageHandler *handler;
1480
1481     if ( type == wxBITMAP_TYPE_ANY )
1482     {
1483         wxList &list=GetHandlers();
1484
1485         for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
1486         {
1487              handler=(wxImageHandler*)node->GetData();
1488              if ( handler->CanRead(stream) )
1489                  return handler->LoadFile(this, stream, true/*verbose*/, index);
1490
1491         }
1492
1493         wxLogWarning( _("No handler found for image type.") );
1494         return false;
1495     }
1496
1497     handler = FindHandler(type);
1498
1499     if (handler == 0)
1500     {
1501         wxLogWarning( _("No image handler for type %d defined."), type );
1502
1503         return false;
1504     }
1505
1506     return handler->LoadFile(this, stream, true/*verbose*/, index);
1507 }
1508
1509 bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int index )
1510 {
1511     UnRef();
1512
1513     m_refData = new wxImageRefData;
1514
1515     wxImageHandler *handler = FindHandlerMime(mimetype);
1516
1517     if (handler == 0)
1518     {
1519         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1520
1521         return false;
1522     }
1523
1524     return handler->LoadFile( this, stream, true/*verbose*/, index );
1525 }
1526
1527 bool wxImage::SaveFile( wxOutputStream& stream, int type ) const
1528 {
1529     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1530
1531     wxImageHandler *handler = FindHandler(type);
1532     if ( !handler )
1533     {
1534         wxLogWarning( _("No image handler for type %d defined."), type );
1535
1536         return false;
1537     }
1538
1539     return handler->SaveFile( (wxImage*)this, stream );
1540 }
1541
1542 bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype ) const
1543 {
1544     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1545
1546     wxImageHandler *handler = FindHandlerMime(mimetype);
1547     if ( !handler )
1548     {
1549         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1550
1551         return false;
1552     }
1553
1554     return handler->SaveFile( (wxImage*)this, stream );
1555 }
1556 #endif // wxUSE_STREAMS
1557
1558 void wxImage::AddHandler( wxImageHandler *handler )
1559 {
1560     // Check for an existing handler of the type being added.
1561     if (FindHandler( handler->GetType() ) == 0)
1562     {
1563         sm_handlers.Append( handler );
1564     }
1565     else
1566     {
1567         // This is not documented behaviour, merely the simplest 'fix'
1568         // for preventing duplicate additions.  If someone ever has
1569         // a good reason to add and remove duplicate handlers (and they
1570         // may) we should probably refcount the duplicates.
1571         //   also an issue in InsertHandler below.
1572
1573         wxLogDebug( _T("Adding duplicate image handler for '%s'"),
1574                     handler->GetName().c_str() );
1575         delete handler;
1576     }
1577 }
1578
1579 void wxImage::InsertHandler( wxImageHandler *handler )
1580 {
1581     // Check for an existing handler of the type being added.
1582     if (FindHandler( handler->GetType() ) == 0)
1583     {
1584         sm_handlers.Insert( handler );
1585     }
1586     else
1587     {
1588         // see AddHandler for additional comments.
1589         wxLogDebug( _T("Inserting duplicate image handler for '%s'"),
1590                     handler->GetName().c_str() );
1591         delete handler;
1592     }
1593 }
1594
1595 bool wxImage::RemoveHandler( const wxString& name )
1596 {
1597     wxImageHandler *handler = FindHandler(name);
1598     if (handler)
1599     {
1600         sm_handlers.DeleteObject(handler);
1601         delete handler;
1602         return true;
1603     }
1604     else
1605         return false;
1606 }
1607
1608 wxImageHandler *wxImage::FindHandler( const wxString& name )
1609 {
1610     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1611     while (node)
1612     {
1613         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1614         if (handler->GetName().Cmp(name) == 0) return handler;
1615
1616         node = node->GetNext();
1617     }
1618     return 0;
1619 }
1620
1621 wxImageHandler *wxImage::FindHandler( const wxString& extension, long bitmapType )
1622 {
1623     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1624     while (node)
1625     {
1626         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1627         if ( (handler->GetExtension().Cmp(extension) == 0) &&
1628             (bitmapType == -1 || handler->GetType() == bitmapType) )
1629             return handler;
1630         node = node->GetNext();
1631     }
1632     return 0;
1633 }
1634
1635 wxImageHandler *wxImage::FindHandler( long bitmapType )
1636 {
1637     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1638     while (node)
1639     {
1640         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1641         if (handler->GetType() == bitmapType) return handler;
1642         node = node->GetNext();
1643     }
1644     return 0;
1645 }
1646
1647 wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype )
1648 {
1649     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1650     while (node)
1651     {
1652         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1653         if (handler->GetMimeType().IsSameAs(mimetype, false)) return handler;
1654         node = node->GetNext();
1655     }
1656     return 0;
1657 }
1658
1659 void wxImage::InitStandardHandlers()
1660 {
1661 #if wxUSE_STREAMS
1662     AddHandler(new wxBMPHandler);
1663 #endif // wxUSE_STREAMS
1664 }
1665
1666 void wxImage::CleanUpHandlers()
1667 {
1668     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1669     while (node)
1670     {
1671         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1672         wxList::compatibility_iterator next = node->GetNext();
1673         delete handler;
1674         node = next;
1675     }
1676
1677     sm_handlers.Clear();
1678 }
1679
1680 wxString wxImage::GetImageExtWildcard()
1681 {
1682     wxString fmts;
1683
1684     wxList& Handlers = wxImage::GetHandlers();
1685     wxList::compatibility_iterator Node = Handlers.GetFirst();
1686     while ( Node )
1687     {
1688         wxImageHandler* Handler = (wxImageHandler*)Node->GetData();
1689         fmts += wxT("*.") + Handler->GetExtension();
1690         Node = Node->GetNext();
1691         if ( Node ) fmts += wxT(";");
1692     }
1693
1694     return wxT("(") + fmts + wxT(")|") + fmts;
1695 }
1696
1697 //-----------------------------------------------------------------------------
1698 // wxImageHandler
1699 //-----------------------------------------------------------------------------
1700
1701 IMPLEMENT_ABSTRACT_CLASS(wxImageHandler,wxObject)
1702
1703 #if wxUSE_STREAMS
1704 bool wxImageHandler::LoadFile( wxImage *WXUNUSED(image), wxInputStream& WXUNUSED(stream), bool WXUNUSED(verbose), int WXUNUSED(index) )
1705 {
1706     return false;
1707 }
1708
1709 bool wxImageHandler::SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream), bool WXUNUSED(verbose) )
1710 {
1711     return false;
1712 }
1713
1714 int wxImageHandler::GetImageCount( wxInputStream& WXUNUSED(stream) )
1715 {
1716     return 1;
1717 }
1718
1719 bool wxImageHandler::CanRead( const wxString& name )
1720 {
1721     if (wxFileExists(name))
1722     {
1723         wxFileInputStream stream(name);
1724         return CanRead(stream);
1725     }
1726
1727     wxLogError( _("Can't check image format of file '%s': file does not exist."), name.c_str() );
1728
1729     return false;
1730 }
1731
1732 bool wxImageHandler::CallDoCanRead(wxInputStream& stream)
1733 {
1734     wxFileOffset posOld = stream.TellI();
1735     if ( posOld == wxInvalidOffset )
1736     {
1737         // can't test unseekable stream
1738         return false;
1739     }
1740
1741     bool ok = DoCanRead(stream);
1742
1743     // restore the old position to be able to test other formats and so on
1744     if ( stream.SeekI(posOld) == wxInvalidOffset )
1745     {
1746         wxLogDebug(_T("Failed to rewind the stream in wxImageHandler!"));
1747
1748         // reading would fail anyhow as we're not at the right position
1749         return false;
1750     }
1751
1752     return ok;
1753 }
1754
1755 #endif // wxUSE_STREAMS
1756
1757 // ----------------------------------------------------------------------------
1758 // image histogram stuff
1759 // ----------------------------------------------------------------------------
1760
1761 bool
1762 wxImageHistogram::FindFirstUnusedColour(unsigned char *r,
1763                                         unsigned char *g,
1764                                         unsigned char *b,
1765                                         unsigned char r2,
1766                                         unsigned char b2,
1767                                         unsigned char g2) const
1768 {
1769     unsigned long key = MakeKey(r2, g2, b2);
1770
1771     while ( find(key) != end() )
1772     {
1773         // color already used
1774         r2++;
1775         if ( r2 >= 255 )
1776         {
1777             r2 = 0;
1778             g2++;
1779             if ( g2 >= 255 )
1780             {
1781                 g2 = 0;
1782                 b2++;
1783                 if ( b2 >= 255 )
1784                 {
1785                     wxLogError(_("No unused colour in image.") );
1786                     return false;
1787                 }
1788             }
1789         }
1790
1791         key = MakeKey(r2, g2, b2);
1792     }
1793
1794     if ( r )
1795         *r = r2;
1796     if ( g )
1797         *g = g2;
1798     if ( b )
1799         *b = b2;
1800
1801     return true;
1802 }
1803
1804 bool
1805 wxImage::FindFirstUnusedColour(unsigned char *r,
1806                                unsigned char *g,
1807                                unsigned char *b,
1808                                unsigned char r2,
1809                                unsigned char b2,
1810                                unsigned char g2) const
1811 {
1812     wxImageHistogram histogram;
1813
1814     ComputeHistogram(histogram);
1815
1816     return histogram.FindFirstUnusedColour(r, g, b, r2, g2, b2);
1817 }
1818
1819
1820
1821 // GRG, Dic/99
1822 // Counts and returns the number of different colours. Optionally stops
1823 // when it exceeds 'stopafter' different colours. This is useful, for
1824 // example, to see if the image can be saved as 8-bit (256 colour or
1825 // less, in this case it would be invoked as CountColours(256)). Default
1826 // value for stopafter is -1 (don't care).
1827 //
1828 unsigned long wxImage::CountColours( unsigned long stopafter ) const
1829 {
1830     wxHashTable h;
1831     wxObject dummy;
1832     unsigned char r, g, b;
1833     unsigned char *p;
1834     unsigned long size, nentries, key;
1835
1836     p = GetData();
1837     size = GetWidth() * GetHeight();
1838     nentries = 0;
1839
1840     for (unsigned long j = 0; (j < size) && (nentries <= stopafter) ; j++)
1841     {
1842         r = *(p++);
1843         g = *(p++);
1844         b = *(p++);
1845         key = wxImageHistogram::MakeKey(r, g, b);
1846
1847         if (h.Get(key) == NULL)
1848         {
1849             h.Put(key, &dummy);
1850             nentries++;
1851         }
1852     }
1853
1854     return nentries;
1855 }
1856
1857
1858 unsigned long wxImage::ComputeHistogram( wxImageHistogram &h ) const
1859 {
1860     unsigned char *p = GetData();
1861     unsigned long nentries = 0;
1862
1863     h.clear();
1864
1865     const unsigned long size = GetWidth() * GetHeight();
1866
1867     unsigned char r, g, b;
1868     for ( unsigned long n = 0; n < size; n++ )
1869     {
1870         r = *p++;
1871         g = *p++;
1872         b = *p++;
1873
1874         wxImageHistogramEntry& entry = h[wxImageHistogram::MakeKey(r, g, b)];
1875
1876         if ( entry.value++ == 0 )
1877             entry.index = nentries++;
1878     }
1879
1880     return nentries;
1881 }
1882
1883 /*
1884  * Rotation code by Carlos Moreno
1885  */
1886
1887 // GRG: I've removed wxRotationPoint - we already have wxRealPoint which
1888 //      does exactly the same thing. And I also got rid of wxRotationPixel
1889 //      bacause of potential problems in architectures where alignment
1890 //      is an issue, so I had to rewrite parts of the code.
1891
1892 static const double gs_Epsilon = 1e-10;
1893
1894 static inline int wxCint (double x)
1895 {
1896     return (x > 0) ? (int) (x + 0.5) : (int) (x - 0.5);
1897 }
1898
1899
1900 // Auxiliary function to rotate a point (x,y) with respect to point p0
1901 // make it inline and use a straight return to facilitate optimization
1902 // also, the function receives the sine and cosine of the angle to avoid
1903 // repeating the time-consuming calls to these functions -- sin/cos can
1904 // be computed and stored in the calling function.
1905
1906 inline wxRealPoint rotated_point (const wxRealPoint & p, double cos_angle, double sin_angle, const wxRealPoint & p0)
1907 {
1908     return wxRealPoint (p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle,
1909                         p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle);
1910 }
1911
1912 inline wxRealPoint rotated_point (double x, double y, double cos_angle, double sin_angle, const wxRealPoint & p0)
1913 {
1914     return rotated_point (wxRealPoint(x,y), cos_angle, sin_angle, p0);
1915 }
1916
1917 wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool interpolating, wxPoint * offset_after_rotation) const
1918 {
1919     int i;
1920     angle = -angle;     // screen coordinates are a mirror image of "real" coordinates
1921
1922     bool has_alpha = HasAlpha();
1923
1924     // Create pointer-based array to accelerate access to wxImage's data
1925     unsigned char ** data = new unsigned char * [GetHeight()];
1926     data[0] = GetData();
1927     for (i = 1; i < GetHeight(); i++)
1928         data[i] = data[i - 1] + (3 * GetWidth());
1929
1930     // Same for alpha channel
1931     unsigned char ** alpha = NULL;
1932     if (has_alpha)
1933     {
1934         alpha = new unsigned char * [GetHeight()];
1935         alpha[0] = GetAlpha();
1936         for (i = 1; i < GetHeight(); i++)
1937             alpha[i] = alpha[i - 1] + GetWidth();
1938     }
1939
1940     // precompute coefficients for rotation formula
1941     // (sine and cosine of the angle)
1942     const double cos_angle = cos(angle);
1943     const double sin_angle = sin(angle);
1944
1945     // Create new Image to store the result
1946     // First, find rectangle that covers the rotated image;  to do that,
1947     // rotate the four corners
1948
1949     const wxRealPoint p0(centre_of_rotation.x, centre_of_rotation.y);
1950
1951     wxRealPoint p1 = rotated_point (0, 0, cos_angle, sin_angle, p0);
1952     wxRealPoint p2 = rotated_point (0, GetHeight(), cos_angle, sin_angle, p0);
1953     wxRealPoint p3 = rotated_point (GetWidth(), 0, cos_angle, sin_angle, p0);
1954     wxRealPoint p4 = rotated_point (GetWidth(), GetHeight(), cos_angle, sin_angle, p0);
1955
1956     int x1 = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x)));
1957     int y1 = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y)));
1958     int x2 = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x)));
1959     int y2 = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y)));
1960
1961     // Create rotated image
1962     wxImage rotated (x2 - x1 + 1, y2 - y1 + 1, false);
1963     // With alpha channel
1964     if (has_alpha)
1965         rotated.SetAlpha();
1966
1967     if (offset_after_rotation != NULL)
1968     {
1969         *offset_after_rotation = wxPoint (x1, y1);
1970     }
1971
1972     // GRG: The rotated (destination) image is always accessed
1973     //      sequentially, so there is no need for a pointer-based
1974     //      array here (and in fact it would be slower).
1975     //
1976     unsigned char * dst = rotated.GetData();
1977
1978     unsigned char * alpha_dst = NULL;
1979     if (has_alpha)
1980         alpha_dst = rotated.GetAlpha();
1981
1982     // GRG: if the original image has a mask, use its RGB values
1983     //      as the blank pixel, else, fall back to default (black).
1984     //
1985     unsigned char blank_r = 0;
1986     unsigned char blank_g = 0;
1987     unsigned char blank_b = 0;
1988
1989     if (HasMask())
1990     {
1991         blank_r = GetMaskRed();
1992         blank_g = GetMaskGreen();
1993         blank_b = GetMaskBlue();
1994         rotated.SetMaskColour( blank_r, blank_g, blank_b );
1995     }
1996
1997     // Now, for each point of the rotated image, find where it came from, by
1998     // performing an inverse rotation (a rotation of -angle) and getting the
1999     // pixel at those coordinates
2000
2001     // GRG: I've taken the (interpolating) test out of the loops, so that
2002     //      it is done only once, instead of repeating it for each pixel.
2003
2004     int x;
2005     if (interpolating)
2006     {
2007         for (int y = 0; y < rotated.GetHeight(); y++)
2008         {
2009             for (x = 0; x < rotated.GetWidth(); x++)
2010             {
2011                 wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
2012
2013                 if (-0.25 < src.x && src.x < GetWidth() - 0.75 &&
2014                     -0.25 < src.y && src.y < GetHeight() - 0.75)
2015                 {
2016                     // interpolate using the 4 enclosing grid-points.  Those
2017                     // points can be obtained using floor and ceiling of the
2018                     // exact coordinates of the point
2019                         // C.M. 2000-02-17:  when the point is near the border, special care is required.
2020
2021                     int x1, y1, x2, y2;
2022
2023                     if (0 < src.x && src.x < GetWidth() - 1)
2024                     {
2025                         x1 = wxCint(floor(src.x));
2026                         x2 = wxCint(ceil(src.x));
2027                     }
2028                     else    // else means that x is near one of the borders (0 or width-1)
2029                     {
2030                         x1 = x2 = wxCint (src.x);
2031                     }
2032
2033                     if (0 < src.y && src.y < GetHeight() - 1)
2034                     {
2035                         y1 = wxCint(floor(src.y));
2036                         y2 = wxCint(ceil(src.y));
2037                     }
2038                     else
2039                     {
2040                         y1 = y2 = wxCint (src.y);
2041                     }
2042
2043                     // get four points and the distances (square of the distance,
2044                     // for efficiency reasons) for the interpolation formula
2045
2046                     // GRG: Do not calculate the points until they are
2047                     //      really needed -- this way we can calculate
2048                     //      just one, instead of four, if d1, d2, d3
2049                     //      or d4 are < gs_Epsilon
2050
2051                     const double d1 = (src.x - x1) * (src.x - x1) + (src.y - y1) * (src.y - y1);
2052                     const double d2 = (src.x - x2) * (src.x - x2) + (src.y - y1) * (src.y - y1);
2053                     const double d3 = (src.x - x2) * (src.x - x2) + (src.y - y2) * (src.y - y2);
2054                     const double d4 = (src.x - x1) * (src.x - x1) + (src.y - y2) * (src.y - y2);
2055
2056                     // Now interpolate as a weighted average of the four surrounding
2057                     // points, where the weights are the distances to each of those points
2058
2059                     // If the point is exactly at one point of the grid of the source
2060                     // image, then don't interpolate -- just assign the pixel
2061
2062                     if (d1 < gs_Epsilon)        // d1,d2,d3,d4 are positive -- no need for abs()
2063                     {
2064                         unsigned char *p = data[y1] + (3 * x1);
2065                         *(dst++) = *(p++);
2066                         *(dst++) = *(p++);
2067                         *(dst++) = *p;
2068
2069                         if (has_alpha)
2070                         {
2071                             unsigned char *p = alpha[y1] + x1;
2072                             *(alpha_dst++) = *p;
2073                         }
2074                     }
2075                     else if (d2 < gs_Epsilon)
2076                     {
2077                         unsigned char *p = data[y1] + (3 * x2);
2078                         *(dst++) = *(p++);
2079                         *(dst++) = *(p++);
2080                         *(dst++) = *p;
2081
2082                         if (has_alpha)
2083                         {
2084                             unsigned char *p = alpha[y1] + x2;
2085                             *(alpha_dst++) = *p;
2086                         }
2087                     }
2088                     else if (d3 < gs_Epsilon)
2089                     {
2090                         unsigned char *p = data[y2] + (3 * x2);
2091                         *(dst++) = *(p++);
2092                         *(dst++) = *(p++);
2093                         *(dst++) = *p;
2094
2095                         if (has_alpha)
2096                         {
2097                             unsigned char *p = alpha[y2] + x2;
2098                             *(alpha_dst++) = *p;
2099                         }
2100                     }
2101                     else if (d4 < gs_Epsilon)
2102                     {
2103                         unsigned char *p = data[y2] + (3 * x1);
2104                         *(dst++) = *(p++);
2105                         *(dst++) = *(p++);
2106                         *(dst++) = *p;
2107
2108                         if (has_alpha)
2109                         {
2110                             unsigned char *p = alpha[y2] + x1;
2111                             *(alpha_dst++) = *p;
2112                         }
2113                     }
2114                     else
2115                     {
2116                         // weights for the weighted average are proportional to the inverse of the distance
2117                         unsigned char *v1 = data[y1] + (3 * x1);
2118                         unsigned char *v2 = data[y1] + (3 * x2);
2119                         unsigned char *v3 = data[y2] + (3 * x2);
2120                         unsigned char *v4 = data[y2] + (3 * x1);
2121
2122                         const double w1 = 1/d1, w2 = 1/d2, w3 = 1/d3, w4 = 1/d4;
2123
2124                         // GRG: Unrolled.
2125
2126                         *(dst++) = (unsigned char)
2127                             ( (w1 * *(v1++) + w2 * *(v2++) +
2128                                w3 * *(v3++) + w4 * *(v4++)) /
2129                               (w1 + w2 + w3 + w4) );
2130                         *(dst++) = (unsigned char)
2131                             ( (w1 * *(v1++) + w2 * *(v2++) +
2132                                w3 * *(v3++) + w4 * *(v4++)) /
2133                               (w1 + w2 + w3 + w4) );
2134                         *(dst++) = (unsigned char)
2135                             ( (w1 * *v1 + w2 * *v2 +
2136                                w3 * *v3 + w4 * *v4) /
2137                               (w1 + w2 + w3 + w4) );
2138
2139                         if (has_alpha)
2140                         {
2141                             unsigned char *v1 = alpha[y1] + (x1);
2142                             unsigned char *v2 = alpha[y1] + (x2);
2143                             unsigned char *v3 = alpha[y2] + (x2);
2144                             unsigned char *v4 = alpha[y2] + (x1);
2145
2146                             *(alpha_dst++) = (unsigned char)
2147                                 ( (w1 * *v1 + w2 * *v2 +
2148                                    w3 * *v3 + w4 * *v4) /
2149                                   (w1 + w2 + w3 + w4) );
2150                         }
2151                     }
2152                 }
2153                 else
2154                 {
2155                     *(dst++) = blank_r;
2156                     *(dst++) = blank_g;
2157                     *(dst++) = blank_b;
2158
2159                     if (has_alpha)
2160                         *(alpha_dst++) = 0;
2161                 }
2162             }
2163         }
2164     }
2165     else    // not interpolating
2166     {
2167         for (int y = 0; y < rotated.GetHeight(); y++)
2168         {
2169             for (x = 0; x < rotated.GetWidth(); x++)
2170             {
2171                 wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
2172
2173                 const int xs = wxCint (src.x);      // wxCint rounds to the
2174                 const int ys = wxCint (src.y);      // closest integer
2175
2176                 if (0 <= xs && xs < GetWidth() &&
2177                     0 <= ys && ys < GetHeight())
2178                 {
2179                     unsigned char *p = data[ys] + (3 * xs);
2180                     *(dst++) = *(p++);
2181                     *(dst++) = *(p++);
2182                     *(dst++) = *p;
2183
2184                     if (has_alpha)
2185                     {
2186                         unsigned char *p = alpha[ys] + (xs);
2187                         *(alpha_dst++) = *p;
2188                     }
2189                 }
2190                 else
2191                 {
2192                     *(dst++) = blank_r;
2193                     *(dst++) = blank_g;
2194                     *(dst++) = blank_b;
2195
2196                     if (has_alpha)
2197                         *(alpha_dst++) = 255;
2198                 }
2199             }
2200         }
2201     }
2202
2203     delete [] data;
2204
2205     if (has_alpha)
2206         delete [] alpha;
2207
2208     return rotated;
2209 }
2210
2211
2212
2213
2214
2215 // A module to allow wxImage initialization/cleanup
2216 // without calling these functions from app.cpp or from
2217 // the user's application.
2218
2219 class wxImageModule: public wxModule
2220 {
2221 DECLARE_DYNAMIC_CLASS(wxImageModule)
2222 public:
2223     wxImageModule() {}
2224     bool OnInit() { wxImage::InitStandardHandlers(); return true; };
2225     void OnExit() { wxImage::CleanUpHandlers(); };
2226 };
2227
2228 IMPLEMENT_DYNAMIC_CLASS(wxImageModule, wxModule)
2229
2230
2231 #endif // wxUSE_IMAGE