src/common/image.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/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 // For compilers that support precompilation, includes "wx.h".
  11 #include "wx/wxprec.h"
  12
  13 #ifdef __BORLANDC__
  14     #pragma hdrstop
  15 #endif
  16
  17 #include "wx/defs.h"
  18
  19 #if wxUSE_IMAGE
  20
  21 #include "wx/image.h"
  22 #include "wx/bitmap.h"
  23 #include "wx/debug.h"
  24 #include "wx/log.h"
  25 #include "wx/app.h"
  26 #include "wx/filefn.h"
  27 #include "wx/wfstream.h"
  28 #include "wx/intl.h"
  29 #include "wx/module.h"
  30 #include "wx/hash.h"
  31 #include "wx/utils.h"
  32 #include "wx/math.h"
  33
  34 #if wxUSE_XPM
  35 #include "wx/xpmdecod.h"
  36 #endif
  37
  38 // For memcpy
  39 #include <string.h>
  40
  41 //-----------------------------------------------------------------------------
  42 // wxImage
  43 //-----------------------------------------------------------------------------
  44
  45 class wxImageRefData: public wxObjectRefData
  46 {
  47 public:
  48     wxImageRefData();
  49     virtual ~wxImageRefData();
  50
  51     int             m_width;
  52     int             m_height;
  53     unsigned char  *m_data;
  54
  55     bool            m_hasMask;
  56     unsigned char   m_maskRed,m_maskGreen,m_maskBlue;
  57
  58     // alpha channel data, may be NULL for the formats without alpha support
  59     unsigned char  *m_alpha;
  60
  61     bool            m_ok;
  62
  63     // if true, m_data is pointer to static data and shouldn't be freed
  64     bool            m_static;
  65
  66     // same as m_static but for m_alpha
  67     bool            m_staticAlpha;
  68
  69 #if wxUSE_PALETTE
  70     wxPalette       m_palette;
  71 #endif // wxUSE_PALETTE
  72
  73     wxArrayString   m_optionNames;
  74     wxArrayString   m_optionValues;
  75
  76     DECLARE_NO_COPY_CLASS(wxImageRefData)
  77 };
  78
  79 wxImageRefData::wxImageRefData()
  80 {
  81     m_width = 0;
  82     m_height = 0;
  83     m_data =
  84     m_alpha = (unsigned char *) NULL;
  85
  86     m_maskRed = 0;
  87     m_maskGreen = 0;
  88     m_maskBlue = 0;
  89     m_hasMask = false;
  90
  91     m_ok = false;
  92     m_static =
  93     m_staticAlpha = false;
  94 }
  95
  96 wxImageRefData::~wxImageRefData()
  97 {
  98     if ( !m_static )
  99         free( m_data );
 100     if ( !m_staticAlpha )
 101         free( m_alpha );
 102 }
 103
 104 wxList wxImage::sm_handlers;
 105
 106 wxImage wxNullImage;
 107
 108 //-----------------------------------------------------------------------------
 109
 110 #define M_IMGDATA ((wxImageRefData *)m_refData)
 111
 112 IMPLEMENT_DYNAMIC_CLASS(wxImage, wxObject)
 113
 114 wxImage::wxImage( int width, int height, bool clear )
 115 {
 116     Create( width, height, clear );
 117 }
 118
 119 wxImage::wxImage( int width, int height, unsigned char* data, bool static_data )
 120 {
 121     Create( width, height, data, static_data );
 122 }
 123
 124 wxImage::wxImage( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data )
 125 {
 126     Create( width, height, data, alpha, static_data );
 127 }
 128
 129 wxImage::wxImage( const wxString& name, long type, int index )
 130 {
 131     LoadFile( name, type, index );
 132 }
 133
 134 wxImage::wxImage( const wxString& name, const wxString& mimetype, int index )
 135 {
 136     LoadFile( name, mimetype, index );
 137 }
 138
 139 #if wxUSE_STREAMS
 140 wxImage::wxImage( wxInputStream& stream, long type, int index )
 141 {
 142     LoadFile( stream, type, index );
 143 }
 144
 145 wxImage::wxImage( wxInputStream& stream, const wxString& mimetype, int index )
 146 {
 147     LoadFile( stream, mimetype, index );
 148 }
 149 #endif // wxUSE_STREAMS
 150
 151 wxImage::wxImage( const wxImage& image )
 152     : wxObject()
 153 {
 154     Ref(image);
 155 }
 156
 157 wxImage::wxImage( const wxImage* image )
 158 {
 159     if (image) Ref(*image);
 160 }
 161
 162 wxImage::wxImage( const char** xpmData )
 163 {
 164     Create(xpmData);
 165 }
 166
 167 wxImage::wxImage( char** xpmData )
 168 {
 169     Create((const char**) xpmData);
 170 }
 171
 172 bool wxImage::Create( const char** xpmData )
 173 {
 174 #if wxUSE_XPM
 175     UnRef();
 176
 177     wxXPMDecoder decoder;
 178     (*this) = decoder.ReadData(xpmData);
 179     return Ok();
 180 #else
 181     return false;
 182 #endif
 183 }
 184
 185 bool wxImage::Create( int width, int height, bool clear )
 186 {
 187     UnRef();
 188
 189     m_refData = new wxImageRefData();
 190
 191     M_IMGDATA->m_data = (unsigned char *) malloc( width*height*3 );
 192     if (!M_IMGDATA->m_data)
 193     {
 194         UnRef();
 195         return false;
 196     }
 197
 198     if (clear)
 199         memset(M_IMGDATA->m_data, 0, width*height*3);
 200
 201     M_IMGDATA->m_width = width;
 202     M_IMGDATA->m_height = height;
 203     M_IMGDATA->m_ok = true;
 204
 205     return true;
 206 }
 207
 208 bool wxImage::Create( int width, int height, unsigned char* data, bool static_data )
 209 {
 210     UnRef();
 211
 212     wxCHECK_MSG( data, false, _T("NULL data in wxImage::Create") );
 213
 214     m_refData = new wxImageRefData();
 215
 216     M_IMGDATA->m_data = data;
 217     M_IMGDATA->m_width = width;
 218     M_IMGDATA->m_height = height;
 219     M_IMGDATA->m_ok = true;
 220     M_IMGDATA->m_static = static_data;
 221
 222     return true;
 223 }
 224
 225 bool wxImage::Create( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data )
 226 {
 227     UnRef();
 228
 229     wxCHECK_MSG( data, false, _T("NULL data in wxImage::Create") );
 230
 231     m_refData = new wxImageRefData();
 232
 233     M_IMGDATA->m_data = data;
 234     M_IMGDATA->m_alpha = alpha;
 235     M_IMGDATA->m_width = width;
 236     M_IMGDATA->m_height = height;
 237     M_IMGDATA->m_ok = true;
 238     M_IMGDATA->m_static = static_data;
 239
 240     return true;
 241 }
 242
 243 void wxImage::Destroy()
 244 {
 245     UnRef();
 246 }
 247
 248 wxImage wxImage::Copy() const
 249 {
 250     wxImage image;
 251
 252     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 253
 254     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 255
 256     unsigned char *data = image.GetData();
 257
 258     wxCHECK_MSG( data, image, wxT("unable to create image") );
 259
 260     image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 261     image.SetMask( M_IMGDATA->m_hasMask );
 262
 263     memcpy( data, GetData(), M_IMGDATA->m_width*M_IMGDATA->m_height*3 );
 264
 265     // also copy the image options
 266     wxImageRefData *imgData = (wxImageRefData *)image.m_refData;
 267     imgData->m_optionNames = M_IMGDATA->m_optionNames;
 268     imgData->m_optionValues = M_IMGDATA->m_optionValues;
 269
 270     return image;
 271 }
 272
 273 wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const
 274 {
 275     if( xFactor == 1 && yFactor == 1 )
 276         return Copy() ;
 277
 278     wxImage image;
 279
 280     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 281
 282     // can't scale to/from 0 size
 283     wxCHECK_MSG( (xFactor > 0) && (yFactor > 0), image,
 284                  wxT("invalid new image size") );
 285
 286     long old_height = M_IMGDATA->m_height,
 287          old_width  = M_IMGDATA->m_width;
 288
 289     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 290                  wxT("invalid old image size") );
 291
 292     long width = old_width / xFactor ;
 293     long height = old_height / yFactor ;
 294
 295     image.Create( width, height, false );
 296
 297     char unsigned *data = image.GetData();
 298
 299     wxCHECK_MSG( data, image, wxT("unable to create image") );
 300
 301     bool hasMask = false ;
 302     unsigned char maskRed = 0;
 303     unsigned char maskGreen = 0;
 304     unsigned char maskBlue =0 ;
 305
 306     unsigned char *source_data = M_IMGDATA->m_data;
 307     unsigned char *target_data = data;
 308     unsigned char *source_alpha = 0 ;
 309     unsigned char *target_alpha = 0 ;
 310     if (M_IMGDATA->m_hasMask)
 311     {
 312         hasMask = true ;
 313         maskRed = M_IMGDATA->m_maskRed;
 314         maskGreen = M_IMGDATA->m_maskGreen;
 315         maskBlue =M_IMGDATA->m_maskBlue ;
 316
 317         image.SetMaskColour( M_IMGDATA->m_maskRed,
 318                              M_IMGDATA->m_maskGreen,
 319                              M_IMGDATA->m_maskBlue );
 320     }
 321     else
 322     {
 323         source_alpha = M_IMGDATA->m_alpha ;
 324         if ( source_alpha )
 325         {
 326             image.SetAlpha() ;
 327             target_alpha = image.GetAlpha() ;
 328         }
 329     }
 330
 331     for (long y = 0; y < height; y++)
 332     {
 333         for (long x = 0; x < width; x++)
 334         {
 335             unsigned long avgRed = 0 ;
 336             unsigned long avgGreen = 0;
 337             unsigned long avgBlue = 0;
 338             unsigned long avgAlpha = 0 ;
 339             unsigned long counter = 0 ;
 340             // determine average
 341             for ( int y1 = 0 ; y1 < yFactor ; ++y1 )
 342             {
 343                 long y_offset = (y * yFactor + y1) * old_width;
 344                 for ( int x1 = 0 ; x1 < xFactor ; ++x1 )
 345                 {
 346                     unsigned char *pixel = source_data + 3 * ( y_offset + x * xFactor + x1 ) ;
 347                     unsigned char red = pixel[0] ;
 348                     unsigned char green = pixel[1] ;
 349                     unsigned char blue = pixel[2] ;
 350                     unsigned char alpha = 255  ;
 351                     if ( source_alpha )
 352                         alpha = *(source_alpha + y_offset + x * xFactor + x1) ;
 353                     if ( !hasMask || red != maskRed || green != maskGreen || blue != maskBlue )
 354                     {
 355                         if ( alpha > 0 )
 356                         {
 357                             avgRed += red ;
 358                             avgGreen += green ;
 359                             avgBlue += blue ;
 360                         }
 361                         avgAlpha += alpha ;
 362                         counter++ ;
 363                     }
 364                 }
 365             }
 366             if ( counter == 0 )
 367             {
 368                 *(target_data++) = M_IMGDATA->m_maskRed ;
 369                 *(target_data++) = M_IMGDATA->m_maskGreen ;
 370                 *(target_data++) = M_IMGDATA->m_maskBlue ;
 371             }
 372             else
 373             {
 374                 if ( source_alpha )
 375                     *(target_alpha++) = (unsigned char)(avgAlpha / counter ) ;
 376                 *(target_data++) = (unsigned char)(avgRed / counter);
 377                 *(target_data++) = (unsigned char)(avgGreen / counter);
 378                 *(target_data++) = (unsigned char)(avgBlue / counter);
 379             }
 380         }
 381     }
 382
 383     // In case this is a cursor, make sure the hotspot is scalled accordingly:
 384     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
 385         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
 386                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X))/xFactor);
 387     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
 388         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
 389                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y))/yFactor);
 390
 391     return image;
 392 }
 393
 394 wxImage wxImage::Scale( int width, int height ) const
 395 {
 396     wxImage image;
 397
 398     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 399
 400     // can't scale to/from 0 size
 401     wxCHECK_MSG( (width > 0) && (height > 0), image,
 402                  wxT("invalid new image size") );
 403
 404     long old_height = M_IMGDATA->m_height,
 405          old_width  = M_IMGDATA->m_width;
 406     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 407                  wxT("invalid old image size") );
 408
 409     if ( old_width % width == 0 && old_width >= width &&
 410         old_height % height == 0 && old_height >= height )
 411     {
 412         return ShrinkBy( old_width / width , old_height / height ) ;
 413     }
 414     image.Create( width, height, false );
 415
 416     unsigned char *data = image.GetData();
 417
 418     wxCHECK_MSG( data, image, wxT("unable to create image") );
 419
 420     unsigned char *source_data = M_IMGDATA->m_data;
 421     unsigned char *target_data = data;
 422     unsigned char *source_alpha = 0 ;
 423     unsigned char *target_alpha = 0 ;
 424
 425     if (M_IMGDATA->m_hasMask)
 426     {
 427         image.SetMaskColour( M_IMGDATA->m_maskRed,
 428                              M_IMGDATA->m_maskGreen,
 429                              M_IMGDATA->m_maskBlue );
 430     }
 431     else
 432     {
 433         source_alpha = M_IMGDATA->m_alpha ;
 434         if ( source_alpha )
 435         {
 436             image.SetAlpha() ;
 437             target_alpha = image.GetAlpha() ;
 438         }
 439     }
 440
 441     long x_delta = (old_width<<16) / width;
 442     long y_delta = (old_height<<16) / height;
 443
 444     unsigned char* dest_pixel = target_data;
 445
 446     long y = 0;
 447     for ( long j = 0; j < height; j++ )
 448         {
 449         unsigned char* src_line = &source_data[(y>>16)*old_width*3];
 450         unsigned char* src_alpha_line = source_alpha ? &source_alpha[(y>>16)*old_width] : 0 ;
 451
 452         long x = 0;
 453         for ( long i = 0; i < width; i++ )
 454         {
 455              unsigned char* src_pixel = &src_line[(x>>16)*3];
 456              unsigned char* src_alpha_pixel = source_alpha ? &src_alpha_line[(x>>16)] : 0 ;
 457              dest_pixel[0] = src_pixel[0];
 458              dest_pixel[1] = src_pixel[1];
 459              dest_pixel[2] = src_pixel[2];
 460              dest_pixel += 3;
 461              if ( source_alpha )
 462                 *(target_alpha++) = *src_alpha_pixel ;
 463              x += x_delta;
 464         }
 465
 466         y += y_delta;
 467     }
 468
 469     // In case this is a cursor, make sure the hotspot is scalled accordingly:
 470     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
 471         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
 472                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X)*width)/old_width);
 473     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
 474         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
 475                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y)*height)/old_height);
 476
 477     return image;
 478 }
 479
 480 wxImage wxImage::Rotate90( bool clockwise ) const
 481 {
 482     wxImage image;
 483
 484     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 485
 486     image.Create( M_IMGDATA->m_height, M_IMGDATA->m_width, false );
 487
 488     unsigned char *data = image.GetData();
 489
 490     wxCHECK_MSG( data, image, wxT("unable to create image") );
 491
 492     unsigned char *source_data = M_IMGDATA->m_data;
 493     unsigned char *target_data;
 494     unsigned char *alpha_data = 0 ;
 495     unsigned char *source_alpha = 0 ;
 496     unsigned char *target_alpha = 0 ;
 497
 498     if (M_IMGDATA->m_hasMask)
 499     {
 500         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 501     }
 502     else
 503     {
 504         source_alpha = M_IMGDATA->m_alpha ;
 505         if ( source_alpha )
 506         {
 507             image.SetAlpha() ;
 508             alpha_data = image.GetAlpha() ;
 509         }
 510     }
 511
 512     long height = M_IMGDATA->m_height;
 513     long width  = M_IMGDATA->m_width;
 514
 515     for (long j = 0; j < height; j++)
 516     {
 517         for (long i = 0; i < width; i++)
 518         {
 519             if (clockwise)
 520             {
 521                 target_data = data + (((i+1)*height) - j - 1)*3;
 522                 if(source_alpha)
 523                     target_alpha = alpha_data + (((i+1)*height) - j - 1);
 524             }
 525             else
 526             {
 527                 target_data = data + ((height*(width-1)) + j - (i*height))*3;
 528                 if(source_alpha)
 529                     target_alpha = alpha_data + ((height*(width-1)) + j - (i*height));
 530             }
 531             memcpy( target_data, source_data, 3 );
 532             source_data += 3;
 533
 534             if(source_alpha)
 535             {
 536                 memcpy( target_alpha, source_alpha, 1 );
 537                 source_alpha += 1;
 538             }
 539         }
 540     }
 541
 542     return image;
 543 }
 544
 545 wxImage wxImage::Mirror( bool horizontally ) const
 546 {
 547     wxImage image;
 548
 549     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 550
 551     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 552
 553     unsigned char *data = image.GetData();
 554
 555     wxCHECK_MSG( data, image, wxT("unable to create image") );
 556
 557     if (M_IMGDATA->m_hasMask)
 558         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 559
 560     long height = M_IMGDATA->m_height;
 561     long width  = M_IMGDATA->m_width;
 562
 563     unsigned char *source_data = M_IMGDATA->m_data;
 564     unsigned char *target_data;
 565
 566     if (horizontally)
 567     {
 568         for (long j = 0; j < height; j++)
 569         {
 570             data += width*3;
 571             target_data = data-3;
 572             for (long i = 0; i < width; i++)
 573             {
 574                 memcpy( target_data, source_data, 3 );
 575                 source_data += 3;
 576                 target_data -= 3;
 577             }
 578         }
 579     }
 580     else
 581     {
 582         for (long i = 0; i < height; i++)
 583         {
 584             target_data = data + 3*width*(height-1-i);
 585             memcpy( target_data, source_data, (size_t)3*width );
 586             source_data += 3*width;
 587         }
 588     }
 589
 590     return image;
 591 }
 592
 593 wxImage wxImage::GetSubImage( const wxRect &rect ) const
 594 {
 595     wxImage image;
 596
 597     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 598
 599     wxCHECK_MSG( (rect.GetLeft()>=0) && (rect.GetTop()>=0) && (rect.GetRight()<=GetWidth()) && (rect.GetBottom()<=GetHeight()),
 600                  image, wxT("invalid subimage size") );
 601
 602     int subwidth=rect.GetWidth();
 603     const int subheight=rect.GetHeight();
 604
 605     image.Create( subwidth, subheight, false );
 606
 607     unsigned char *subdata = image.GetData(), *data=GetData();
 608
 609     wxCHECK_MSG( subdata, image, wxT("unable to create image") );
 610
 611     if (M_IMGDATA->m_hasMask)
 612         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 613
 614     const int subleft=3*rect.GetLeft();
 615     const int width=3*GetWidth();
 616     subwidth*=3;
 617
 618     data+=rect.GetTop()*width+subleft;
 619
 620     for (long j = 0; j < subheight; ++j)
 621     {
 622         memcpy( subdata, data, subwidth);
 623         subdata+=subwidth;
 624         data+=width;
 625     }
 626
 627     return image;
 628 }
 629
 630 wxImage wxImage::Size( const wxSize& size, const wxPoint& pos,
 631                        int r_, int g_, int b_ ) const
 632 {
 633     wxImage image;
 634
 635     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 636     wxCHECK_MSG( (size.GetWidth() > 0) && (size.GetHeight() > 0), image, wxT("invalid size") );
 637
 638     int width = GetWidth(), height = GetHeight();
 639     image.Create(size.GetWidth(), size.GetHeight(), false);
 640
 641     unsigned char r = (unsigned char)r_;
 642     unsigned char g = (unsigned char)g_;
 643     unsigned char b = (unsigned char)b_;
 644     if ((r_ == -1) && (g_ == -1) && (b_ == -1))
 645     {
 646         GetOrFindMaskColour( &r, &g, &b );
 647         image.SetMaskColour(r, g, b);
 648     }
 649
 650     image.SetRGB(wxRect(), r, g, b);
 651
 652     wxRect subRect(pos.x, pos.y, width, height);
 653     wxRect finalRect(0, 0, size.GetWidth(), size.GetHeight());
 654
 655     subRect.Intersect(finalRect);
 656
 657     if (!subRect.IsEmpty())
 658     {
 659         if ((subRect.GetWidth() == width) && (subRect.GetHeight() == height))
 660             image.Paste(*this, pos.x, pos.y);
 661         else
 662             image.Paste(GetSubImage(subRect), pos.x, pos.y);
 663     }
 664
 665     return image;
 666 }
 667
 668 void wxImage::Paste( const wxImage &image, int x, int y )
 669 {
 670     wxCHECK_RET( Ok(), wxT("invalid image") );
 671     wxCHECK_RET( image.Ok(), wxT("invalid image") );
 672
 673     int xx = 0;
 674     int yy = 0;
 675     int width = image.GetWidth();
 676     int height = image.GetHeight();
 677
 678     if (x < 0)
 679     {
 680         xx = -x;
 681         width += x;
 682     }
 683     if (y < 0)
 684     {
 685         yy = -y;
 686         height += y;
 687     }
 688
 689     if ((x+xx)+width > M_IMGDATA->m_width)
 690         width = M_IMGDATA->m_width - (x+xx);
 691     if ((y+yy)+height > M_IMGDATA->m_height)
 692         height = M_IMGDATA->m_height - (y+yy);
 693
 694     if (width < 1) return;
 695     if (height < 1) return;
 696
 697     if ((!HasMask() && !image.HasMask()) ||
 698         (HasMask() && !image.HasMask()) ||
 699        ((HasMask() && image.HasMask() &&
 700          (GetMaskRed()==image.GetMaskRed()) &&
 701          (GetMaskGreen()==image.GetMaskGreen()) &&
 702          (GetMaskBlue()==image.GetMaskBlue()))))
 703     {
 704         width *= 3;
 705         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 706         int source_step = image.GetWidth()*3;
 707
 708         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 709         int target_step = M_IMGDATA->m_width*3;
 710         for (int j = 0; j < height; j++)
 711         {
 712             memcpy( target_data, source_data, width );
 713             source_data += source_step;
 714             target_data += target_step;
 715         }
 716         return;
 717     }
 718
 719     if (!HasMask() && image.HasMask())
 720     {
 721         unsigned char r = image.GetMaskRed();
 722         unsigned char g = image.GetMaskGreen();
 723         unsigned char b = image.GetMaskBlue();
 724
 725         width *= 3;
 726         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 727         int source_step = image.GetWidth()*3;
 728
 729         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 730         int target_step = M_IMGDATA->m_width*3;
 731
 732         for (int j = 0; j < height; j++)
 733         {
 734             for (int i = 0; i < width; i+=3)
 735             {
 736                 if ((source_data[i]   != r) &&
 737                     (source_data[i+1] != g) &&
 738                     (source_data[i+2] != b))
 739                 {
 740                     memcpy( target_data+i, source_data+i, 3 );
 741                 }
 742             }
 743             source_data += source_step;
 744             target_data += target_step;
 745         }
 746     }
 747 }
 748
 749 void wxImage::Replace( unsigned char r1, unsigned char g1, unsigned char b1,
 750                        unsigned char r2, unsigned char g2, unsigned char b2 )
 751 {
 752     wxCHECK_RET( Ok(), wxT("invalid image") );
 753
 754     unsigned char *data = GetData();
 755
 756     const int w = GetWidth();
 757     const int h = GetHeight();
 758
 759     for (int j = 0; j < h; j++)
 760         for (int i = 0; i < w; i++)
 761         {
 762             if ((data[0] == r1) && (data[1] == g1) && (data[2] == b1))
 763             {
 764                 data[0] = r2;
 765                 data[1] = g2;
 766                 data[2] = b2;
 767             }
 768             data += 3;
 769         }
 770 }
 771
 772 wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const
 773 {
 774     wxImage image;
 775
 776     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 777
 778     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 779
 780     unsigned char *data = image.GetData();
 781
 782     wxCHECK_MSG( data, image, wxT("unable to create image") );
 783
 784     if (M_IMGDATA->m_hasMask)
 785     {
 786         if (M_IMGDATA->m_maskRed == r && M_IMGDATA->m_maskGreen == g &&
 787                                          M_IMGDATA->m_maskBlue == b)
 788             image.SetMaskColour( 255, 255, 255 );
 789         else
 790             image.SetMaskColour( 0, 0, 0 );
 791     }
 792
 793     long size = M_IMGDATA->m_height * M_IMGDATA->m_width;
 794
 795     unsigned char *srcd = M_IMGDATA->m_data;
 796     unsigned char *tard = image.GetData();
 797
 798     for ( long i = 0; i < size; i++, srcd += 3, tard += 3 )
 799     {
 800         if (srcd[0] == r && srcd[1] == g && srcd[2] == b)
 801             tard[0] = tard[1] = tard[2] = 255;
 802         else
 803             tard[0] = tard[1] = tard[2] = 0;
 804     }
 805
 806     return image;
 807 }
 808
 809 int wxImage::GetWidth() const
 810 {
 811     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 812
 813     return M_IMGDATA->m_width;
 814 }
 815
 816 int wxImage::GetHeight() const
 817 {
 818     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 819
 820     return M_IMGDATA->m_height;
 821 }
 822
 823 long wxImage::XYToIndex(int x, int y) const
 824 {
 825     if ( Ok() &&
 826             x >= 0 && y >= 0 &&
 827                 x < M_IMGDATA->m_width && y < M_IMGDATA->m_height )
 828     {
 829         return y*M_IMGDATA->m_width + x;
 830     }
 831
 832     return -1;
 833 }
 834
 835 void wxImage::SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b )
 836 {
 837     long pos = XYToIndex(x, y);
 838     wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
 839
 840     pos *= 3;
 841
 842     M_IMGDATA->m_data[ pos   ] = r;
 843     M_IMGDATA->m_data[ pos+1 ] = g;
 844     M_IMGDATA->m_data[ pos+2 ] = b;
 845 }
 846
 847 void wxImage::SetRGB( const wxRect& rect_, unsigned char r, unsigned char g, unsigned char b )
 848 {
 849     wxCHECK_RET( Ok(), wxT("invalid image") );
 850
 851     wxRect rect(rect_);
 852     wxRect imageRect(0, 0, GetWidth(), GetHeight());
 853     if ( rect == wxRect() )
 854     {
 855         rect = imageRect;
 856     }
 857     else
 858     {
 859         wxCHECK_RET( imageRect.Inside(rect.GetTopLeft()) &&
 860                      imageRect.Inside(rect.GetBottomRight()),
 861                      wxT("invalid bounding rectangle") );
 862     }
 863
 864     int x1 = rect.GetLeft(),
 865         y1 = rect.GetTop(),
 866         x2 = rect.GetRight() + 1,
 867         y2 = rect.GetBottom() + 1;
 868
 869     unsigned char *data wxDUMMY_INITIALIZE(NULL);
 870     int x, y, width = GetWidth();
 871     for (y = y1; y < y2; y++)
 872     {
 873         data = M_IMGDATA->m_data + (y*width + x1)*3;
 874         for (x = x1; x < x2; x++)
 875         {
 876             *data++ = r;
 877             *data++ = g;
 878             *data++ = b;
 879         }
 880     }
 881 }
 882
 883 unsigned char wxImage::GetRed( int x, int y ) const
 884 {
 885     long pos = XYToIndex(x, y);
 886     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
 887
 888     pos *= 3;
 889
 890     return M_IMGDATA->m_data[pos];
 891 }
 892
 893 unsigned char wxImage::GetGreen( int x, int y ) const
 894 {
 895     long pos = XYToIndex(x, y);
 896     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
 897
 898     pos *= 3;
 899
 900     return M_IMGDATA->m_data[pos+1];
 901 }
 902
 903 unsigned char wxImage::GetBlue( int x, int y ) const
 904 {
 905     long pos = XYToIndex(x, y);
 906     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
 907
 908     pos *= 3;
 909
 910     return M_IMGDATA->m_data[pos+2];
 911 }
 912
 913 bool wxImage::Ok() const
 914 {
 915     // image of 0 width or height can't be considered ok - at least because it
 916     // causes crashes in ConvertToBitmap() if we don't catch it in time
 917     wxImageRefData *data = M_IMGDATA;
 918     return data && data->m_ok && data->m_width && data->m_height;
 919 }
 920
 921 unsigned char *wxImage::GetData() const
 922 {
 923     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
 924
 925     return M_IMGDATA->m_data;
 926 }
 927
 928 void wxImage::SetData( unsigned char *data, bool static_data  )
 929 {
 930     wxCHECK_RET( Ok(), wxT("invalid image") );
 931
 932     wxImageRefData *newRefData = new wxImageRefData();
 933
 934     newRefData->m_width = M_IMGDATA->m_width;
 935     newRefData->m_height = M_IMGDATA->m_height;
 936     newRefData->m_data = data;
 937     newRefData->m_ok = true;
 938     newRefData->m_maskRed = M_IMGDATA->m_maskRed;
 939     newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
 940     newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
 941     newRefData->m_hasMask = M_IMGDATA->m_hasMask;
 942     newRefData->m_static = static_data;
 943
 944     UnRef();
 945
 946     m_refData = newRefData;
 947 }
 948
 949 void wxImage::SetData( unsigned char *data, int new_width, int new_height, bool static_data )
 950 {
 951     wxImageRefData *newRefData = new wxImageRefData();
 952
 953     if (m_refData)
 954     {
 955         newRefData->m_width = new_width;
 956         newRefData->m_height = new_height;
 957         newRefData->m_data = data;
 958         newRefData->m_ok = true;
 959         newRefData->m_maskRed = M_IMGDATA->m_maskRed;
 960         newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
 961         newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
 962         newRefData->m_hasMask = M_IMGDATA->m_hasMask;
 963     }
 964     else
 965     {
 966         newRefData->m_width = new_width;
 967         newRefData->m_height = new_height;
 968         newRefData->m_data = data;
 969         newRefData->m_ok = true;
 970     }
 971     newRefData->m_static = static_data;
 972
 973     UnRef();
 974
 975     m_refData = newRefData;
 976 }
 977
 978 // ----------------------------------------------------------------------------
 979 // alpha channel support
 980 // ----------------------------------------------------------------------------
 981
 982 void wxImage::SetAlpha(int x, int y, unsigned char alpha)
 983 {
 984     wxCHECK_RET( HasAlpha(), wxT("no alpha channel") );
 985
 986     long pos = XYToIndex(x, y);
 987     wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
 988
 989     M_IMGDATA->m_alpha[pos] = alpha;
 990 }
 991
 992 unsigned char wxImage::GetAlpha(int x, int y) const
 993 {
 994     wxCHECK_MSG( HasAlpha(), 0, wxT("no alpha channel") );
 995
 996     long pos = XYToIndex(x, y);
 997     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
 998
 999     return M_IMGDATA->m_alpha[pos];
1000 }
1001
1002 bool
1003 wxImage::ConvertColourToAlpha(unsigned char r, unsigned char g, unsigned char b)
1004 {
1005     SetAlpha(NULL);
1006
1007     const int w = M_IMGDATA->m_width;
1008     const int h = M_IMGDATA->m_height;
1009
1010     unsigned char *alpha = GetAlpha();
1011     unsigned char *data = GetData();
1012
1013     for ( int y = 0; y < h; y++ )
1014     {
1015         for ( int x = 0; x < w; x++ )
1016         {
1017             *alpha++ = *data;
1018             *data++ = r;
1019             *data++ = g;
1020             *data++ = b;
1021         }
1022     }
1023
1024     return true;
1025 }
1026
1027 void wxImage::SetAlpha( unsigned char *alpha, bool static_data )
1028 {
1029     wxCHECK_RET( Ok(), wxT("invalid image") );
1030
1031     if ( !alpha )
1032     {
1033         alpha = (unsigned char *)malloc(M_IMGDATA->m_width*M_IMGDATA->m_height);
1034     }
1035
1036     free(M_IMGDATA->m_alpha);
1037     M_IMGDATA->m_alpha = alpha;
1038     M_IMGDATA->m_staticAlpha = static_data;
1039 }
1040
1041 unsigned char *wxImage::GetAlpha() const
1042 {
1043     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
1044
1045     return M_IMGDATA->m_alpha;
1046 }
1047
1048 void wxImage::InitAlpha()
1049 {
1050     wxCHECK_RET( !HasAlpha(), wxT("image already has an alpha channel") );
1051
1052     // initialize memory for alpha channel
1053     SetAlpha();
1054
1055     unsigned char *alpha = M_IMGDATA->m_alpha;
1056     const size_t lenAlpha = M_IMGDATA->m_width * M_IMGDATA->m_height;
1057
1058     if ( HasMask() )
1059     {
1060         // use the mask to initialize the alpha channel.
1061         const unsigned char * const alphaEnd = alpha + lenAlpha;
1062
1063         const unsigned char mr = M_IMGDATA->m_maskRed;
1064         const unsigned char mg = M_IMGDATA->m_maskGreen;
1065         const unsigned char mb = M_IMGDATA->m_maskBlue;
1066         for ( unsigned char *src = M_IMGDATA->m_data;
1067               alpha < alphaEnd;
1068               src += 3, alpha++ )
1069         {
1070             *alpha = (src[0] == mr && src[1] == mg && src[2] == mb)
1071                             ? wxIMAGE_ALPHA_TRANSPARENT
1072                             : wxIMAGE_ALPHA_OPAQUE;
1073         }
1074
1075         M_IMGDATA->m_hasMask = false;
1076     }
1077     else // no mask
1078     {
1079         // make the image fully opaque
1080         memset(alpha, wxIMAGE_ALPHA_OPAQUE, lenAlpha);
1081     }
1082 }
1083
1084 // ----------------------------------------------------------------------------
1085 // mask support
1086 // ----------------------------------------------------------------------------
1087
1088 void wxImage::SetMaskColour( unsigned char r, unsigned char g, unsigned char b )
1089 {
1090     wxCHECK_RET( Ok(), wxT("invalid image") );
1091
1092     M_IMGDATA->m_maskRed = r;
1093     M_IMGDATA->m_maskGreen = g;
1094     M_IMGDATA->m_maskBlue = b;
1095     M_IMGDATA->m_hasMask = true;
1096 }
1097
1098 bool wxImage::GetOrFindMaskColour( unsigned char *r, unsigned char *g, unsigned char *b ) const
1099 {
1100     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1101
1102     if (M_IMGDATA->m_hasMask)
1103     {
1104         if (r) *r = M_IMGDATA->m_maskRed;
1105         if (g) *g = M_IMGDATA->m_maskGreen;
1106         if (b) *b = M_IMGDATA->m_maskBlue;
1107         return true;
1108     }
1109     else
1110     {
1111         FindFirstUnusedColour(r, g, b);
1112         return false;
1113     }
1114 }
1115
1116 unsigned char wxImage::GetMaskRed() const
1117 {
1118     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1119
1120     return M_IMGDATA->m_maskRed;
1121 }
1122
1123 unsigned char wxImage::GetMaskGreen() const
1124 {
1125     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1126
1127     return M_IMGDATA->m_maskGreen;
1128 }
1129
1130 unsigned char wxImage::GetMaskBlue() const
1131 {
1132     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1133
1134     return M_IMGDATA->m_maskBlue;
1135 }
1136
1137 void wxImage::SetMask( bool mask )
1138 {
1139     wxCHECK_RET( Ok(), wxT("invalid image") );
1140
1141     M_IMGDATA->m_hasMask = mask;
1142 }
1143
1144 bool wxImage::HasMask() const
1145 {
1146     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1147
1148     return M_IMGDATA->m_hasMask;
1149 }
1150
1151 bool wxImage::IsTransparent(int x, int y, unsigned char threshold) const
1152 {
1153     long pos = XYToIndex(x, y);
1154     wxCHECK_MSG( pos != -1, false, wxT("invalid image coordinates") );
1155
1156     // check mask
1157     if ( M_IMGDATA->m_hasMask )
1158     {
1159         const unsigned char *p = M_IMGDATA->m_data + 3*pos;
1160         if ( p[0] == M_IMGDATA->m_maskRed &&
1161                 p[1] == M_IMGDATA->m_maskGreen &&
1162                     p[2] == M_IMGDATA->m_maskBlue )
1163         {
1164             return true;
1165         }
1166     }
1167
1168     // then check alpha
1169     if ( M_IMGDATA->m_alpha )
1170     {
1171         if ( M_IMGDATA->m_alpha[pos] < threshold )
1172         {
1173             // transparent enough
1174             return true;
1175         }
1176     }
1177
1178     // not transparent
1179     return false;
1180 }
1181
1182 bool wxImage::SetMaskFromImage(const wxImage& mask,
1183                                unsigned char mr, unsigned char mg, unsigned char mb)
1184 {
1185     // check that the images are the same size
1186     if ( (M_IMGDATA->m_height != mask.GetHeight() ) || (M_IMGDATA->m_width != mask.GetWidth () ) )
1187     {
1188         wxLogError( _("Image and mask have different sizes.") );
1189         return false;
1190     }
1191
1192     // find unused colour
1193     unsigned char r,g,b ;
1194     if (!FindFirstUnusedColour(&r, &g, &b))
1195     {
1196         wxLogError( _("No unused colour in image being masked.") );
1197         return false ;
1198     }
1199
1200     unsigned char *imgdata = GetData();
1201     unsigned char *maskdata = mask.GetData();
1202
1203     const int w = GetWidth();
1204     const int h = GetHeight();
1205
1206     for (int j = 0; j < h; j++)
1207     {
1208         for (int i = 0; i < w; i++)
1209         {
1210             if ((maskdata[0] == mr) && (maskdata[1]  == mg) && (maskdata[2] == mb))
1211             {
1212                 imgdata[0] = r;
1213                 imgdata[1] = g;
1214                 imgdata[2] = b;
1215             }
1216             imgdata  += 3;
1217             maskdata += 3;
1218         }
1219     }
1220
1221     SetMaskColour(r, g, b);
1222     SetMask(true);
1223
1224     return true;
1225 }
1226
1227 bool wxImage::ConvertAlphaToMask(unsigned char threshold)
1228 {
1229     if (!HasAlpha())
1230         return true;
1231
1232     unsigned char mr, mg, mb;
1233     if (!FindFirstUnusedColour(&mr, &mg, &mb))
1234     {
1235         wxLogError( _("No unused colour in image being masked.") );
1236         return false;
1237     }
1238
1239     SetMask(true);
1240     SetMaskColour(mr, mg, mb);
1241
1242     unsigned char *imgdata = GetData();
1243     unsigned char *alphadata = GetAlpha();
1244
1245     int w = GetWidth();
1246     int h = GetHeight();
1247
1248     for (int y = 0; y < h; y++)
1249     {
1250         for (int x = 0; x < w; x++, imgdata += 3, alphadata++)
1251         {
1252             if (*alphadata < threshold)
1253             {
1254                 imgdata[0] = mr;
1255                 imgdata[1] = mg;
1256                 imgdata[2] = mb;
1257             }
1258         }
1259     }
1260
1261     free(M_IMGDATA->m_alpha);
1262     M_IMGDATA->m_alpha = NULL;
1263
1264     return true;
1265 }
1266
1267 // ----------------------------------------------------------------------------
1268 // Palette functions
1269 // ----------------------------------------------------------------------------
1270
1271 #if wxUSE_PALETTE
1272
1273 bool wxImage::HasPalette() const
1274 {
1275     if (!Ok())
1276         return false;
1277
1278     return M_IMGDATA->m_palette.Ok();
1279 }
1280
1281 const wxPalette& wxImage::GetPalette() const
1282 {
1283     wxCHECK_MSG( Ok(), wxNullPalette, wxT("invalid image") );
1284
1285     return M_IMGDATA->m_palette;
1286 }
1287
1288 void wxImage::SetPalette(const wxPalette& palette)
1289 {
1290     wxCHECK_RET( Ok(), wxT("invalid image") );
1291
1292     M_IMGDATA->m_palette = palette;
1293 }
1294
1295 #endif // wxUSE_PALETTE
1296
1297 // ----------------------------------------------------------------------------
1298 // Option functions (arbitrary name/value mapping)
1299 // ----------------------------------------------------------------------------
1300
1301 void wxImage::SetOption(const wxString& name, const wxString& value)
1302 {
1303     wxCHECK_RET( Ok(), wxT("invalid image") );
1304
1305     int idx = M_IMGDATA->m_optionNames.Index(name, false);
1306     if (idx == wxNOT_FOUND)
1307     {
1308         M_IMGDATA->m_optionNames.Add(name);
1309         M_IMGDATA->m_optionValues.Add(value);
1310     }
1311     else
1312     {
1313         M_IMGDATA->m_optionNames[idx] = name;
1314         M_IMGDATA->m_optionValues[idx] = value;
1315     }
1316 }
1317
1318 void wxImage::SetOption(const wxString& name, int value)
1319 {
1320     wxString valStr;
1321     valStr.Printf(wxT("%d"), value);
1322     SetOption(name, valStr);
1323 }
1324
1325 wxString wxImage::GetOption(const wxString& name) const
1326 {
1327     wxCHECK_MSG( Ok(), wxEmptyString, wxT("invalid image") );
1328
1329     int idx = M_IMGDATA->m_optionNames.Index(name, false);
1330     if (idx == wxNOT_FOUND)
1331         return wxEmptyString;
1332     else
1333         return M_IMGDATA->m_optionValues[idx];
1334 }
1335
1336 int wxImage::GetOptionInt(const wxString& name) const
1337 {
1338     return wxAtoi(GetOption(name));
1339 }
1340
1341 bool wxImage::HasOption(const wxString& name) const
1342 {
1343     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1344
1345     return (M_IMGDATA->m_optionNames.Index(name, false) != wxNOT_FOUND);
1346 }
1347
1348 // ----------------------------------------------------------------------------
1349 // image I/O
1350 // ----------------------------------------------------------------------------
1351
1352 bool wxImage::LoadFile( const wxString& filename, long type, int index )
1353 {
1354 #if wxUSE_STREAMS
1355     if (wxFileExists(filename))
1356     {
1357         wxFileInputStream stream(filename);
1358         wxBufferedInputStream bstream( stream );
1359         return LoadFile(bstream, type, index);
1360     }
1361     else
1362     {
1363         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
1364
1365         return false;
1366     }
1367 #else // !wxUSE_STREAMS
1368     return false;
1369 #endif // wxUSE_STREAMS
1370 }
1371
1372 bool wxImage::LoadFile( const wxString& filename, const wxString& mimetype, int index )
1373 {
1374 #if wxUSE_STREAMS
1375     if (wxFileExists(filename))
1376     {
1377         wxFileInputStream stream(filename);
1378         wxBufferedInputStream bstream( stream );
1379         return LoadFile(bstream, mimetype, index);
1380     }
1381     else
1382     {
1383         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
1384
1385         return false;
1386     }
1387 #else // !wxUSE_STREAMS
1388     return false;
1389 #endif // wxUSE_STREAMS
1390 }
1391
1392
1393
1394 bool wxImage::SaveFile( const wxString& filename ) const
1395 {
1396     wxString ext = filename.AfterLast('.').Lower();
1397
1398     wxImageHandler * pHandler = FindHandler(ext, -1);
1399     if (pHandler)
1400     {
1401         SaveFile(filename, pHandler->GetType());
1402         return true;
1403     }
1404
1405     wxLogError(_("Can't save image to file '%s': unknown extension."), filename.c_str());
1406
1407     return false;
1408 }
1409
1410 bool wxImage::SaveFile( const wxString& filename, int type ) 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, type);
1423     }
1424 #endif // wxUSE_STREAMS
1425
1426     return false;
1427 }
1428
1429 bool wxImage::SaveFile( const wxString& filename, const wxString& mimetype ) const
1430 {
1431 #if wxUSE_STREAMS
1432     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1433
1434     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
1435
1436     wxFileOutputStream stream(filename);
1437
1438     if ( stream.IsOk() )
1439     {
1440         wxBufferedOutputStream bstream( stream );
1441         return SaveFile(bstream, mimetype);
1442     }
1443 #endif // wxUSE_STREAMS
1444
1445     return false;
1446 }
1447
1448 bool wxImage::CanRead( const wxString &name )
1449 {
1450 #if wxUSE_STREAMS
1451   wxFileInputStream stream(name);
1452   return CanRead(stream);
1453 #else
1454   return false;
1455 #endif
1456 }
1457
1458 int wxImage::GetImageCount( const wxString &name, long type )
1459 {
1460 #if wxUSE_STREAMS
1461   wxFileInputStream stream(name);
1462   if (stream.Ok())
1463       return GetImageCount(stream, type);
1464 #endif
1465
1466   return 0;
1467 }
1468
1469 #if wxUSE_STREAMS
1470
1471 bool wxImage::CanRead( wxInputStream &stream )
1472 {
1473     const wxList& list = GetHandlers();
1474
1475     for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
1476     {
1477         wxImageHandler *handler=(wxImageHandler*)node->GetData();
1478         if (handler->CanRead( stream ))
1479             return true;
1480     }
1481
1482     return false;
1483 }
1484
1485 int wxImage::GetImageCount( wxInputStream &stream, long type )
1486 {
1487     wxImageHandler *handler;
1488
1489     if ( type == wxBITMAP_TYPE_ANY )
1490     {
1491         wxList &list=GetHandlers();
1492
1493         for (wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext())
1494         {
1495              handler=(wxImageHandler*)node->GetData();
1496              if ( handler->CanRead(stream) )
1497                  return handler->GetImageCount(stream);
1498
1499         }
1500
1501         wxLogWarning(_("No handler found for image type."));
1502         return 0;
1503     }
1504
1505     handler = FindHandler(type);
1506
1507     if ( !handler )
1508     {
1509         wxLogWarning(_("No image handler for type %d defined."), type);
1510         return false;
1511     }
1512
1513     if ( handler->CanRead(stream) )
1514     {
1515         return handler->GetImageCount(stream);
1516     }
1517     else
1518     {
1519         wxLogError(_("Image file is not of type %d."), type);
1520         return 0;
1521     }
1522 }
1523
1524 bool wxImage::LoadFile( wxInputStream& stream, long type, int index )
1525 {
1526     UnRef();
1527
1528     m_refData = new wxImageRefData;
1529
1530     wxImageHandler *handler;
1531
1532     if ( type == wxBITMAP_TYPE_ANY )
1533     {
1534         wxList &list=GetHandlers();
1535
1536         for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
1537         {
1538              handler=(wxImageHandler*)node->GetData();
1539              if ( handler->CanRead(stream) )
1540                  return handler->LoadFile(this, stream, true/*verbose*/, index);
1541
1542         }
1543
1544         wxLogWarning( _("No handler found for image type.") );
1545         return false;
1546     }
1547
1548     handler = FindHandler(type);
1549
1550     if (handler == 0)
1551     {
1552         wxLogWarning( _("No image handler for type %d defined."), type );
1553
1554         return false;
1555     }
1556
1557     return handler->LoadFile(this, stream, true/*verbose*/, index);
1558 }
1559
1560 bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int index )
1561 {
1562     UnRef();
1563
1564     m_refData = new wxImageRefData;
1565
1566     wxImageHandler *handler = FindHandlerMime(mimetype);
1567
1568     if (handler == 0)
1569     {
1570         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1571
1572         return false;
1573     }
1574
1575     return handler->LoadFile( this, stream, true/*verbose*/, index );
1576 }
1577
1578 bool wxImage::SaveFile( wxOutputStream& stream, int type ) const
1579 {
1580     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1581
1582     wxImageHandler *handler = FindHandler(type);
1583     if ( !handler )
1584     {
1585         wxLogWarning( _("No image handler for type %d defined."), type );
1586
1587         return false;
1588     }
1589
1590     return handler->SaveFile( (wxImage*)this, stream );
1591 }
1592
1593 bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype ) const
1594 {
1595     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1596
1597     wxImageHandler *handler = FindHandlerMime(mimetype);
1598     if ( !handler )
1599     {
1600         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1601
1602         return false;
1603     }
1604
1605     return handler->SaveFile( (wxImage*)this, stream );
1606 }
1607 #endif // wxUSE_STREAMS
1608
1609 // ----------------------------------------------------------------------------
1610 // image I/O handlers
1611 // ----------------------------------------------------------------------------
1612
1613 void wxImage::AddHandler( wxImageHandler *handler )
1614 {
1615     // Check for an existing handler of the type being added.
1616     if (FindHandler( handler->GetType() ) == 0)
1617     {
1618         sm_handlers.Append( handler );
1619     }
1620     else
1621     {
1622         // This is not documented behaviour, merely the simplest 'fix'
1623         // for preventing duplicate additions.  If someone ever has
1624         // a good reason to add and remove duplicate handlers (and they
1625         // may) we should probably refcount the duplicates.
1626         //   also an issue in InsertHandler below.
1627
1628         wxLogDebug( _T("Adding duplicate image handler for '%s'"),
1629                     handler->GetName().c_str() );
1630         delete handler;
1631     }
1632 }
1633
1634 void wxImage::InsertHandler( wxImageHandler *handler )
1635 {
1636     // Check for an existing handler of the type being added.
1637     if (FindHandler( handler->GetType() ) == 0)
1638     {
1639         sm_handlers.Insert( handler );
1640     }
1641     else
1642     {
1643         // see AddHandler for additional comments.
1644         wxLogDebug( _T("Inserting duplicate image handler for '%s'"),
1645                     handler->GetName().c_str() );
1646         delete handler;
1647     }
1648 }
1649
1650 bool wxImage::RemoveHandler( const wxString& name )
1651 {
1652     wxImageHandler *handler = FindHandler(name);
1653     if (handler)
1654     {
1655         sm_handlers.DeleteObject(handler);
1656         delete handler;
1657         return true;
1658     }
1659     else
1660         return false;
1661 }
1662
1663 wxImageHandler *wxImage::FindHandler( const wxString& name )
1664 {
1665     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1666     while (node)
1667     {
1668         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1669         if (handler->GetName().Cmp(name) == 0) return handler;
1670
1671         node = node->GetNext();
1672     }
1673     return 0;
1674 }
1675
1676 wxImageHandler *wxImage::FindHandler( const wxString& extension, long bitmapType )
1677 {
1678     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1679     while (node)
1680     {
1681         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1682         if ( (handler->GetExtension().Cmp(extension) == 0) &&
1683             (bitmapType == -1 || handler->GetType() == bitmapType) )
1684             return handler;
1685         node = node->GetNext();
1686     }
1687     return 0;
1688 }
1689
1690 wxImageHandler *wxImage::FindHandler( long bitmapType )
1691 {
1692     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1693     while (node)
1694     {
1695         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1696         if (handler->GetType() == bitmapType) return handler;
1697         node = node->GetNext();
1698     }
1699     return 0;
1700 }
1701
1702 wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype )
1703 {
1704     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1705     while (node)
1706     {
1707         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1708         if (handler->GetMimeType().IsSameAs(mimetype, false)) return handler;
1709         node = node->GetNext();
1710     }
1711     return 0;
1712 }
1713
1714 void wxImage::InitStandardHandlers()
1715 {
1716 #if wxUSE_STREAMS
1717     AddHandler(new wxBMPHandler);
1718 #endif // wxUSE_STREAMS
1719 }
1720
1721 void wxImage::CleanUpHandlers()
1722 {
1723     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1724     while (node)
1725     {
1726         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1727         wxList::compatibility_iterator next = node->GetNext();
1728         delete handler;
1729         node = next;
1730     }
1731
1732     sm_handlers.Clear();
1733 }
1734
1735 wxString wxImage::GetImageExtWildcard()
1736 {
1737     wxString fmts;
1738
1739     wxList& Handlers = wxImage::GetHandlers();
1740     wxList::compatibility_iterator Node = Handlers.GetFirst();
1741     while ( Node )
1742     {
1743         wxImageHandler* Handler = (wxImageHandler*)Node->GetData();
1744         fmts += wxT("*.") + Handler->GetExtension();
1745         Node = Node->GetNext();
1746         if ( Node ) fmts += wxT(";");
1747     }
1748
1749     return wxT("(") + fmts + wxT(")|") + fmts;
1750 }
1751
1752 wxImage::HSVValue wxImage::RGBtoHSV(const RGBValue& rgb)
1753 {
1754     const double red = rgb.red / 255.0,
1755                  green = rgb.green / 255.0,
1756                  blue = rgb.blue / 255.0;
1757
1758     // find the min and max intensity (and remember which one was it for the
1759     // latter)
1760     double minimumRGB = red;
1761     if ( green < minimumRGB )
1762         minimumRGB = green;
1763     if ( blue < minimumRGB )
1764         minimumRGB = blue;
1765
1766     enum { RED, GREEN, BLUE } chMax = RED;
1767     double maximumRGB = red;
1768     if ( green > maximumRGB )
1769     {
1770         chMax = GREEN;
1771         maximumRGB = green;
1772     }
1773     if ( blue > maximumRGB )
1774     {
1775         chMax = BLUE;
1776         maximumRGB = blue;
1777     }
1778
1779     const double value = maximumRGB;
1780
1781     double hue = 0.0, saturation;
1782     const double deltaRGB = maximumRGB - minimumRGB;
1783     if ( wxIsNullDouble(deltaRGB) )
1784     {
1785         // Gray has no color
1786         hue = 0.0;
1787         saturation = 0.0;
1788     }
1789     else
1790     {
1791         switch ( chMax )
1792         {
1793             case RED:
1794                 hue = (green - blue) / deltaRGB;
1795                 break;
1796
1797             case GREEN:
1798                 hue = 2.0 + (blue - red) / deltaRGB;
1799                 break;
1800
1801             case BLUE:
1802                 hue = 4.0 + (red - green) / deltaRGB;
1803                 break;
1804
1805             default:
1806                 wxFAIL_MSG(wxT("hue not specified"));
1807                 break;
1808         }
1809
1810         hue /= 6.0;
1811
1812         if ( hue < 0.0 )
1813             hue += 1.0;
1814
1815         saturation = deltaRGB / maximumRGB;
1816     }
1817
1818     return HSVValue(hue, saturation, value);
1819 }
1820
1821 wxImage::RGBValue wxImage::HSVtoRGB(const HSVValue& hsv)
1822 {
1823     double red, green, blue;
1824
1825     if ( wxIsNullDouble(hsv.saturation) )
1826     {
1827         // Grey
1828         red = hsv.value;
1829         green = hsv.value;
1830         blue = hsv.value;
1831     }
1832     else // not grey
1833     {
1834         double hue = hsv.hue * 6.0;      // sector 0 to 5
1835         int i = (int)floor(hue);
1836         double f = hue - i;          // fractional part of h
1837         double p = hsv.value * (1.0 - hsv.saturation);
1838
1839         switch (i)
1840         {
1841             case 0:
1842                 red = hsv.value;
1843                 green = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
1844                 blue = p;
1845                 break;
1846
1847             case 1:
1848                 red = hsv.value * (1.0 - hsv.saturation * f);
1849                 green = hsv.value;
1850                 blue = p;
1851                 break;
1852
1853             case 2:
1854                 red = p;
1855                 green = hsv.value;
1856                 blue = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
1857                 break;
1858
1859             case 3:
1860                 red = p;
1861                 green = hsv.value * (1.0 - hsv.saturation * f);
1862                 blue = hsv.value;
1863                 break;
1864
1865             case 4:
1866                 red = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
1867                 green = p;
1868                 blue = hsv.value;
1869                 break;
1870
1871             default:    // case 5:
1872                 red = hsv.value;
1873                 green = p;
1874                 blue = hsv.value * (1.0 - hsv.saturation * f);
1875                 break;
1876         }
1877     }
1878
1879     return RGBValue((unsigned char)(red * 255.0),
1880                     (unsigned char)(green * 255.0),
1881                     (unsigned char)(blue * 255.0));
1882 }
1883
1884 /*
1885  * Rotates the hue of each pixel of the image. angle is a double in the range
1886  * -1.0..1.0 where -1.0 is -360 degrees and 1.0 is 360 degrees
1887  */
1888 void wxImage::RotateHue(double angle)
1889 {
1890     unsigned char *srcBytePtr;
1891     unsigned char *dstBytePtr;
1892     unsigned long count;
1893     wxImage::HSVValue hsv;
1894     wxImage::RGBValue rgb;
1895
1896     wxASSERT (angle >= -1.0 && angle <= 1.0);
1897     count = M_IMGDATA->m_width * M_IMGDATA->m_height;
1898     if ( count > 0 && !wxIsNullDouble(angle) )
1899     {
1900         srcBytePtr = M_IMGDATA->m_data;
1901         dstBytePtr = srcBytePtr;
1902         do
1903         {
1904             rgb.red = *srcBytePtr++;
1905             rgb.green = *srcBytePtr++;
1906             rgb.blue = *srcBytePtr++;
1907             hsv = RGBtoHSV(rgb);
1908
1909             hsv.hue = hsv.hue + angle;
1910             if (hsv.hue > 1.0)
1911                 hsv.hue = hsv.hue - 1.0;
1912             else if (hsv.hue < 0.0)
1913                 hsv.hue = hsv.hue + 1.0;
1914
1915             rgb = HSVtoRGB(hsv);
1916             *dstBytePtr++ = rgb.red;
1917             *dstBytePtr++ = rgb.green;
1918             *dstBytePtr++ = rgb.blue;
1919         } while (--count != 0);
1920     }
1921 }
1922
1923 //-----------------------------------------------------------------------------
1924 // wxImageHandler
1925 //-----------------------------------------------------------------------------
1926
1927 IMPLEMENT_ABSTRACT_CLASS(wxImageHandler,wxObject)
1928
1929 #if wxUSE_STREAMS
1930 bool wxImageHandler::LoadFile( wxImage *WXUNUSED(image), wxInputStream& WXUNUSED(stream), bool WXUNUSED(verbose), int WXUNUSED(index) )
1931 {
1932     return false;
1933 }
1934
1935 bool wxImageHandler::SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream), bool WXUNUSED(verbose) )
1936 {
1937     return false;
1938 }
1939
1940 int wxImageHandler::GetImageCount( wxInputStream& WXUNUSED(stream) )
1941 {
1942     return 1;
1943 }
1944
1945 bool wxImageHandler::CanRead( const wxString& name )
1946 {
1947     if (wxFileExists(name))
1948     {
1949         wxFileInputStream stream(name);
1950         return CanRead(stream);
1951     }
1952
1953     wxLogError( _("Can't check image format of file '%s': file does not exist."), name.c_str() );
1954
1955     return false;
1956 }
1957
1958 bool wxImageHandler::CallDoCanRead(wxInputStream& stream)
1959 {
1960     wxFileOffset posOld = stream.TellI();
1961     if ( posOld == wxInvalidOffset )
1962     {
1963         // can't test unseekable stream
1964         return false;
1965     }
1966
1967     bool ok = DoCanRead(stream);
1968
1969     // restore the old position to be able to test other formats and so on
1970     if ( stream.SeekI(posOld) == wxInvalidOffset )
1971     {
1972         wxLogDebug(_T("Failed to rewind the stream in wxImageHandler!"));
1973
1974         // reading would fail anyhow as we're not at the right position
1975         return false;
1976     }
1977
1978     return ok;
1979 }
1980
1981 #endif // wxUSE_STREAMS
1982
1983 // ----------------------------------------------------------------------------
1984 // image histogram stuff
1985 // ----------------------------------------------------------------------------
1986
1987 bool
1988 wxImageHistogram::FindFirstUnusedColour(unsigned char *r,
1989                                         unsigned char *g,
1990                                         unsigned char *b,
1991                                         unsigned char r2,
1992                                         unsigned char b2,
1993                                         unsigned char g2) const
1994 {
1995     unsigned long key = MakeKey(r2, g2, b2);
1996
1997     while ( find(key) != end() )
1998     {
1999         // color already used
2000         r2++;
2001         if ( r2 >= 255 )
2002         {
2003             r2 = 0;
2004             g2++;
2005             if ( g2 >= 255 )
2006             {
2007                 g2 = 0;
2008                 b2++;
2009                 if ( b2 >= 255 )
2010                 {
2011                     wxLogError(_("No unused colour in image.") );
2012                     return false;
2013                 }
2014             }
2015         }
2016
2017         key = MakeKey(r2, g2, b2);
2018     }
2019
2020     if ( r )
2021         *r = r2;
2022     if ( g )
2023         *g = g2;
2024     if ( b )
2025         *b = b2;
2026
2027     return true;
2028 }
2029
2030 bool
2031 wxImage::FindFirstUnusedColour(unsigned char *r,
2032                                unsigned char *g,
2033                                unsigned char *b,
2034                                unsigned char r2,
2035                                unsigned char b2,
2036                                unsigned char g2) const
2037 {
2038     wxImageHistogram histogram;
2039
2040     ComputeHistogram(histogram);
2041
2042     return histogram.FindFirstUnusedColour(r, g, b, r2, g2, b2);
2043 }
2044
2045
2046
2047 // GRG, Dic/99
2048 // Counts and returns the number of different colours. Optionally stops
2049 // when it exceeds 'stopafter' different colours. This is useful, for
2050 // example, to see if the image can be saved as 8-bit (256 colour or
2051 // less, in this case it would be invoked as CountColours(256)). Default
2052 // value for stopafter is -1 (don't care).
2053 //
2054 unsigned long wxImage::CountColours( unsigned long stopafter ) const
2055 {
2056     wxHashTable h;
2057     wxObject dummy;
2058     unsigned char r, g, b;
2059     unsigned char *p;
2060     unsigned long size, nentries, key;
2061
2062     p = GetData();
2063     size = GetWidth() * GetHeight();
2064     nentries = 0;
2065
2066     for (unsigned long j = 0; (j < size) && (nentries <= stopafter) ; j++)
2067     {
2068         r = *(p++);
2069         g = *(p++);
2070         b = *(p++);
2071         key = wxImageHistogram::MakeKey(r, g, b);
2072
2073         if (h.Get(key) == NULL)
2074         {
2075             h.Put(key, &dummy);
2076             nentries++;
2077         }
2078     }
2079
2080     return nentries;
2081 }
2082
2083
2084 unsigned long wxImage::ComputeHistogram( wxImageHistogram &h ) const
2085 {
2086     unsigned char *p = GetData();
2087     unsigned long nentries = 0;
2088
2089     h.clear();
2090
2091     const unsigned long size = GetWidth() * GetHeight();
2092
2093     unsigned char r, g, b;
2094     for ( unsigned long n = 0; n < size; n++ )
2095     {
2096         r = *p++;
2097         g = *p++;
2098         b = *p++;
2099
2100         wxImageHistogramEntry& entry = h[wxImageHistogram::MakeKey(r, g, b)];
2101
2102         if ( entry.value++ == 0 )
2103             entry.index = nentries++;
2104     }
2105
2106     return nentries;
2107 }
2108
2109 /*
2110  * Rotation code by Carlos Moreno
2111  */
2112
2113 // GRG: I've removed wxRotationPoint - we already have wxRealPoint which
2114 //      does exactly the same thing. And I also got rid of wxRotationPixel
2115 //      bacause of potential problems in architectures where alignment
2116 //      is an issue, so I had to rewrite parts of the code.
2117
2118 static const double gs_Epsilon = 1e-10;
2119
2120 static inline int wxCint (double x)
2121 {
2122     return (x > 0) ? (int) (x + 0.5) : (int) (x - 0.5);
2123 }
2124
2125
2126 // Auxiliary function to rotate a point (x,y) with respect to point p0
2127 // make it inline and use a straight return to facilitate optimization
2128 // also, the function receives the sine and cosine of the angle to avoid
2129 // repeating the time-consuming calls to these functions -- sin/cos can
2130 // be computed and stored in the calling function.
2131
2132 inline wxRealPoint rotated_point (const wxRealPoint & p, double cos_angle, double sin_angle, const wxRealPoint & p0)
2133 {
2134     return wxRealPoint (p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle,
2135                         p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle);
2136 }
2137
2138 inline wxRealPoint rotated_point (double x, double y, double cos_angle, double sin_angle, const wxRealPoint & p0)
2139 {
2140     return rotated_point (wxRealPoint(x,y), cos_angle, sin_angle, p0);
2141 }
2142
2143 wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool interpolating, wxPoint * offset_after_rotation) const
2144 {
2145     int i;
2146     angle = -angle;     // screen coordinates are a mirror image of "real" coordinates
2147
2148     bool has_alpha = HasAlpha();
2149
2150     // Create pointer-based array to accelerate access to wxImage's data
2151     unsigned char ** data = new unsigned char * [GetHeight()];
2152     data[0] = GetData();
2153     for (i = 1; i < GetHeight(); i++)
2154         data[i] = data[i - 1] + (3 * GetWidth());
2155
2156     // Same for alpha channel
2157     unsigned char ** alpha = NULL;
2158     if (has_alpha)
2159     {
2160         alpha = new unsigned char * [GetHeight()];
2161         alpha[0] = GetAlpha();
2162         for (i = 1; i < GetHeight(); i++)
2163             alpha[i] = alpha[i - 1] + GetWidth();
2164     }
2165
2166     // precompute coefficients for rotation formula
2167     // (sine and cosine of the angle)
2168     const double cos_angle = cos(angle);
2169     const double sin_angle = sin(angle);
2170
2171     // Create new Image to store the result
2172     // First, find rectangle that covers the rotated image;  to do that,
2173     // rotate the four corners
2174
2175     const wxRealPoint p0(centre_of_rotation.x, centre_of_rotation.y);
2176
2177     wxRealPoint p1 = rotated_point (0, 0, cos_angle, sin_angle, p0);
2178     wxRealPoint p2 = rotated_point (0, GetHeight(), cos_angle, sin_angle, p0);
2179     wxRealPoint p3 = rotated_point (GetWidth(), 0, cos_angle, sin_angle, p0);
2180     wxRealPoint p4 = rotated_point (GetWidth(), GetHeight(), cos_angle, sin_angle, p0);
2181
2182     int x1a = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x)));
2183     int y1a = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y)));
2184     int x2a = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x)));
2185     int y2a = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y)));
2186
2187     // Create rotated image
2188     wxImage rotated (x2a - x1a + 1, y2a - y1a + 1, false);
2189     // With alpha channel
2190     if (has_alpha)
2191         rotated.SetAlpha();
2192
2193     if (offset_after_rotation != NULL)
2194     {
2195         *offset_after_rotation = wxPoint (x1a, y1a);
2196     }
2197
2198     // GRG: The rotated (destination) image is always accessed
2199     //      sequentially, so there is no need for a pointer-based
2200     //      array here (and in fact it would be slower).
2201     //
2202     unsigned char * dst = rotated.GetData();
2203
2204     unsigned char * alpha_dst = NULL;
2205     if (has_alpha)
2206         alpha_dst = rotated.GetAlpha();
2207
2208     // GRG: if the original image has a mask, use its RGB values
2209     //      as the blank pixel, else, fall back to default (black).
2210     //
2211     unsigned char blank_r = 0;
2212     unsigned char blank_g = 0;
2213     unsigned char blank_b = 0;
2214
2215     if (HasMask())
2216     {
2217         blank_r = GetMaskRed();
2218         blank_g = GetMaskGreen();
2219         blank_b = GetMaskBlue();
2220         rotated.SetMaskColour( blank_r, blank_g, blank_b );
2221     }
2222
2223     // Now, for each point of the rotated image, find where it came from, by
2224     // performing an inverse rotation (a rotation of -angle) and getting the
2225     // pixel at those coordinates
2226
2227     // GRG: I've taken the (interpolating) test out of the loops, so that
2228     //      it is done only once, instead of repeating it for each pixel.
2229
2230     int x;
2231     if (interpolating)
2232     {
2233         for (int y = 0; y < rotated.GetHeight(); y++)
2234         {
2235             for (x = 0; x < rotated.GetWidth(); x++)
2236             {
2237                 wxRealPoint src = rotated_point (x + x1a, y + y1a, cos_angle, -sin_angle, p0);
2238
2239                 if (-0.25 < src.x && src.x < GetWidth() - 0.75 &&
2240                     -0.25 < src.y && src.y < GetHeight() - 0.75)
2241                 {
2242                     // interpolate using the 4 enclosing grid-points.  Those
2243                     // points can be obtained using floor and ceiling of the
2244                     // exact coordinates of the point
2245                     int x1, y1, x2, y2;
2246
2247                     if (0 < src.x && src.x < GetWidth() - 1)
2248                     {
2249                         x1 = wxCint(floor(src.x));
2250                         x2 = wxCint(ceil(src.x));
2251                     }
2252                     else    // else means that x is near one of the borders (0 or width-1)
2253                     {
2254                         x1 = x2 = wxCint (src.x);
2255                     }
2256
2257                     if (0 < src.y && src.y < GetHeight() - 1)
2258                     {
2259                         y1 = wxCint(floor(src.y));
2260                         y2 = wxCint(ceil(src.y));
2261                     }
2262                     else
2263                     {
2264                         y1 = y2 = wxCint (src.y);
2265                     }
2266
2267                     // get four points and the distances (square of the distance,
2268                     // for efficiency reasons) for the interpolation formula
2269
2270                     // GRG: Do not calculate the points until they are
2271                     //      really needed -- this way we can calculate
2272                     //      just one, instead of four, if d1, d2, d3
2273                     //      or d4 are < gs_Epsilon
2274
2275                     const double d1 = (src.x - x1) * (src.x - x1) + (src.y - y1) * (src.y - y1);
2276                     const double d2 = (src.x - x2) * (src.x - x2) + (src.y - y1) * (src.y - y1);
2277                     const double d3 = (src.x - x2) * (src.x - x2) + (src.y - y2) * (src.y - y2);
2278                     const double d4 = (src.x - x1) * (src.x - x1) + (src.y - y2) * (src.y - y2);
2279
2280                     // Now interpolate as a weighted average of the four surrounding
2281                     // points, where the weights are the distances to each of those points
2282
2283                     // If the point is exactly at one point of the grid of the source
2284                     // image, then don't interpolate -- just assign the pixel
2285
2286                     if (d1 < gs_Epsilon)        // d1,d2,d3,d4 are positive -- no need for abs()
2287                     {
2288                         unsigned char *p = data[y1] + (3 * x1);
2289                         *(dst++) = *(p++);
2290                         *(dst++) = *(p++);
2291                         *(dst++) = *p;
2292
2293                         if (has_alpha)
2294                             *(alpha_dst++) = *(alpha[y1] + x1);
2295                     }
2296                     else if (d2 < gs_Epsilon)
2297                     {
2298                         unsigned char *p = data[y1] + (3 * x2);
2299                         *(dst++) = *(p++);
2300                         *(dst++) = *(p++);
2301                         *(dst++) = *p;
2302
2303                         if (has_alpha)
2304                             *(alpha_dst++) = *(alpha[y1] + x2);
2305                     }
2306                     else if (d3 < gs_Epsilon)
2307                     {
2308                         unsigned char *p = data[y2] + (3 * x2);
2309                         *(dst++) = *(p++);
2310                         *(dst++) = *(p++);
2311                         *(dst++) = *p;
2312
2313                         if (has_alpha)
2314                             *(alpha_dst++) = *(alpha[y2] + x2);
2315                     }
2316                     else if (d4 < gs_Epsilon)
2317                     {
2318                         unsigned char *p = data[y2] + (3 * x1);
2319                         *(dst++) = *(p++);
2320                         *(dst++) = *(p++);
2321                         *(dst++) = *p;
2322
2323                         if (has_alpha)
2324                             *(alpha_dst++) = *(alpha[y2] + x1);
2325                     }
2326                     else
2327                     {
2328                         // weights for the weighted average are proportional to the inverse of the distance
2329                         unsigned char *v1 = data[y1] + (3 * x1);
2330                         unsigned char *v2 = data[y1] + (3 * x2);
2331                         unsigned char *v3 = data[y2] + (3 * x2);
2332                         unsigned char *v4 = data[y2] + (3 * x1);
2333
2334                         const double w1 = 1/d1, w2 = 1/d2, w3 = 1/d3, w4 = 1/d4;
2335
2336                         // GRG: Unrolled.
2337
2338                         *(dst++) = (unsigned char)
2339                             ( (w1 * *(v1++) + w2 * *(v2++) +
2340                                w3 * *(v3++) + w4 * *(v4++)) /
2341                               (w1 + w2 + w3 + w4) );
2342                         *(dst++) = (unsigned char)
2343                             ( (w1 * *(v1++) + w2 * *(v2++) +
2344                                w3 * *(v3++) + w4 * *(v4++)) /
2345                               (w1 + w2 + w3 + w4) );
2346                         *(dst++) = (unsigned char)
2347                             ( (w1 * *v1 + w2 * *v2 +
2348                                w3 * *v3 + w4 * *v4) /
2349                               (w1 + w2 + w3 + w4) );
2350
2351                         if (has_alpha)
2352                         {
2353                             v1 = alpha[y1] + (x1);
2354                             v2 = alpha[y1] + (x2);
2355                             v3 = alpha[y2] + (x2);
2356                             v4 = alpha[y2] + (x1);
2357
2358                             *(alpha_dst++) = (unsigned char)
2359                                 ( (w1 * *v1 + w2 * *v2 +
2360                                    w3 * *v3 + w4 * *v4) /
2361                                   (w1 + w2 + w3 + w4) );
2362                         }
2363                     }
2364                 }
2365                 else
2366                 {
2367                     *(dst++) = blank_r;
2368                     *(dst++) = blank_g;
2369                     *(dst++) = blank_b;
2370
2371                     if (has_alpha)
2372                         *(alpha_dst++) = 0;
2373                 }
2374             }
2375         }
2376     }
2377     else    // not interpolating
2378     {
2379         for (int y = 0; y < rotated.GetHeight(); y++)
2380         {
2381             for (x = 0; x < rotated.GetWidth(); x++)
2382             {
2383                 wxRealPoint src = rotated_point (x + x1a, y + y1a, cos_angle, -sin_angle, p0);
2384
2385                 const int xs = wxCint (src.x);      // wxCint rounds to the
2386                 const int ys = wxCint (src.y);      // closest integer
2387
2388                 if (0 <= xs && xs < GetWidth() &&
2389                     0 <= ys && ys < GetHeight())
2390                 {
2391                     unsigned char *p = data[ys] + (3 * xs);
2392                     *(dst++) = *(p++);
2393                     *(dst++) = *(p++);
2394                     *(dst++) = *p;
2395
2396                     if (has_alpha)
2397                         *(alpha_dst++) = *(alpha[ys] + (xs));
2398                 }
2399                 else
2400                 {
2401                     *(dst++) = blank_r;
2402                     *(dst++) = blank_g;
2403                     *(dst++) = blank_b;
2404
2405                     if (has_alpha)
2406                         *(alpha_dst++) = 255;
2407                 }
2408             }
2409         }
2410     }
2411
2412     delete [] data;
2413
2414     if (has_alpha)
2415         delete [] alpha;
2416
2417     return rotated;
2418 }
2419
2420
2421
2422
2423
2424 // A module to allow wxImage initialization/cleanup
2425 // without calling these functions from app.cpp or from
2426 // the user's application.
2427
2428 class wxImageModule: public wxModule
2429 {
2430 DECLARE_DYNAMIC_CLASS(wxImageModule)
2431 public:
2432     wxImageModule() {}
2433     bool OnInit() { wxImage::InitStandardHandlers(); return true; };
2434     void OnExit() { wxImage::CleanUpHandlers(); };
2435 };
2436
2437 IMPLEMENT_DYNAMIC_CLASS(wxImageModule, wxModule)
2438
2439
2440 #endif // wxUSE_IMAGE