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 scaled 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 scaled 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     if (!handler->CanRead(stream))
1558     {
1559         wxLogError(_("Image file is not of type %d."), type);
1560         return false;
1561     }
1562     else
1563         return handler->LoadFile(this, stream, true/*verbose*/, index);
1564 }
1565
1566 bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int index )
1567 {
1568     UnRef();
1569
1570     m_refData = new wxImageRefData;
1571
1572     wxImageHandler *handler = FindHandlerMime(mimetype);
1573
1574     if (handler == 0)
1575     {
1576         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1577
1578         return false;
1579     }
1580
1581     if (!handler->CanRead(stream))
1582     {
1583         wxLogError(_("Image file is not of type %s."), (const wxChar*) mimetype);
1584         return false;
1585     }
1586     else
1587         return handler->LoadFile( this, stream, true/*verbose*/, index );
1588 }
1589
1590 bool wxImage::SaveFile( wxOutputStream& stream, int type ) const
1591 {
1592     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1593
1594     wxImageHandler *handler = FindHandler(type);
1595     if ( !handler )
1596     {
1597         wxLogWarning( _("No image handler for type %d defined."), type );
1598
1599         return false;
1600     }
1601
1602     return handler->SaveFile( (wxImage*)this, stream );
1603 }
1604
1605 bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype ) const
1606 {
1607     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1608
1609     wxImageHandler *handler = FindHandlerMime(mimetype);
1610     if ( !handler )
1611     {
1612         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1613
1614         return false;
1615     }
1616
1617     return handler->SaveFile( (wxImage*)this, stream );
1618 }
1619 #endif // wxUSE_STREAMS
1620
1621 // ----------------------------------------------------------------------------
1622 // image I/O handlers
1623 // ----------------------------------------------------------------------------
1624
1625 void wxImage::AddHandler( wxImageHandler *handler )
1626 {
1627     // Check for an existing handler of the type being added.
1628     if (FindHandler( handler->GetType() ) == 0)
1629     {
1630         sm_handlers.Append( handler );
1631     }
1632     else
1633     {
1634         // This is not documented behaviour, merely the simplest 'fix'
1635         // for preventing duplicate additions.  If someone ever has
1636         // a good reason to add and remove duplicate handlers (and they
1637         // may) we should probably refcount the duplicates.
1638         //   also an issue in InsertHandler below.
1639
1640         wxLogDebug( _T("Adding duplicate image handler for '%s'"),
1641                     handler->GetName().c_str() );
1642         delete handler;
1643     }
1644 }
1645
1646 void wxImage::InsertHandler( wxImageHandler *handler )
1647 {
1648     // Check for an existing handler of the type being added.
1649     if (FindHandler( handler->GetType() ) == 0)
1650     {
1651         sm_handlers.Insert( handler );
1652     }
1653     else
1654     {
1655         // see AddHandler for additional comments.
1656         wxLogDebug( _T("Inserting duplicate image handler for '%s'"),
1657                     handler->GetName().c_str() );
1658         delete handler;
1659     }
1660 }
1661
1662 bool wxImage::RemoveHandler( const wxString& name )
1663 {
1664     wxImageHandler *handler = FindHandler(name);
1665     if (handler)
1666     {
1667         sm_handlers.DeleteObject(handler);
1668         delete handler;
1669         return true;
1670     }
1671     else
1672         return false;
1673 }
1674
1675 wxImageHandler *wxImage::FindHandler( const wxString& name )
1676 {
1677     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1678     while (node)
1679     {
1680         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1681         if (handler->GetName().Cmp(name) == 0) return handler;
1682
1683         node = node->GetNext();
1684     }
1685     return 0;
1686 }
1687
1688 wxImageHandler *wxImage::FindHandler( const wxString& extension, long bitmapType )
1689 {
1690     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1691     while (node)
1692     {
1693         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1694         if ( (handler->GetExtension().Cmp(extension) == 0) &&
1695             (bitmapType == -1 || handler->GetType() == bitmapType) )
1696             return handler;
1697         node = node->GetNext();
1698     }
1699     return 0;
1700 }
1701
1702 wxImageHandler *wxImage::FindHandler( long bitmapType )
1703 {
1704     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1705     while (node)
1706     {
1707         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1708         if (handler->GetType() == bitmapType) return handler;
1709         node = node->GetNext();
1710     }
1711     return 0;
1712 }
1713
1714 wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype )
1715 {
1716     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1717     while (node)
1718     {
1719         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1720         if (handler->GetMimeType().IsSameAs(mimetype, false)) return handler;
1721         node = node->GetNext();
1722     }
1723     return 0;
1724 }
1725
1726 void wxImage::InitStandardHandlers()
1727 {
1728 #if wxUSE_STREAMS
1729     AddHandler(new wxBMPHandler);
1730 #endif // wxUSE_STREAMS
1731 }
1732
1733 void wxImage::CleanUpHandlers()
1734 {
1735     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1736     while (node)
1737     {
1738         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1739         wxList::compatibility_iterator next = node->GetNext();
1740         delete handler;
1741         node = next;
1742     }
1743
1744     sm_handlers.Clear();
1745 }
1746
1747 wxString wxImage::GetImageExtWildcard()
1748 {
1749     wxString fmts;
1750
1751     wxList& Handlers = wxImage::GetHandlers();
1752     wxList::compatibility_iterator Node = Handlers.GetFirst();
1753     while ( Node )
1754     {
1755         wxImageHandler* Handler = (wxImageHandler*)Node->GetData();
1756         fmts += wxT("*.") + Handler->GetExtension();
1757         Node = Node->GetNext();
1758         if ( Node ) fmts += wxT(";");
1759     }
1760
1761     return wxT("(") + fmts + wxT(")|") + fmts;
1762 }
1763
1764 wxImage::HSVValue wxImage::RGBtoHSV(const RGBValue& rgb)
1765 {
1766     const double red = rgb.red / 255.0,
1767                  green = rgb.green / 255.0,
1768                  blue = rgb.blue / 255.0;
1769
1770     // find the min and max intensity (and remember which one was it for the
1771     // latter)
1772     double minimumRGB = red;
1773     if ( green < minimumRGB )
1774         minimumRGB = green;
1775     if ( blue < minimumRGB )
1776         minimumRGB = blue;
1777
1778     enum { RED, GREEN, BLUE } chMax = RED;
1779     double maximumRGB = red;
1780     if ( green > maximumRGB )
1781     {
1782         chMax = GREEN;
1783         maximumRGB = green;
1784     }
1785     if ( blue > maximumRGB )
1786     {
1787         chMax = BLUE;
1788         maximumRGB = blue;
1789     }
1790
1791     const double value = maximumRGB;
1792
1793     double hue = 0.0, saturation;
1794     const double deltaRGB = maximumRGB - minimumRGB;
1795     if ( wxIsNullDouble(deltaRGB) )
1796     {
1797         // Gray has no color
1798         hue = 0.0;
1799         saturation = 0.0;
1800     }
1801     else
1802     {
1803         switch ( chMax )
1804         {
1805             case RED:
1806                 hue = (green - blue) / deltaRGB;
1807                 break;
1808
1809             case GREEN:
1810                 hue = 2.0 + (blue - red) / deltaRGB;
1811                 break;
1812
1813             case BLUE:
1814                 hue = 4.0 + (red - green) / deltaRGB;
1815                 break;
1816
1817             default:
1818                 wxFAIL_MSG(wxT("hue not specified"));
1819                 break;
1820         }
1821
1822         hue /= 6.0;
1823
1824         if ( hue < 0.0 )
1825             hue += 1.0;
1826
1827         saturation = deltaRGB / maximumRGB;
1828     }
1829
1830     return HSVValue(hue, saturation, value);
1831 }
1832
1833 wxImage::RGBValue wxImage::HSVtoRGB(const HSVValue& hsv)
1834 {
1835     double red, green, blue;
1836
1837     if ( wxIsNullDouble(hsv.saturation) )
1838     {
1839         // Grey
1840         red = hsv.value;
1841         green = hsv.value;
1842         blue = hsv.value;
1843     }
1844     else // not grey
1845     {
1846         double hue = hsv.hue * 6.0;      // sector 0 to 5
1847         int i = (int)floor(hue);
1848         double f = hue - i;          // fractional part of h
1849         double p = hsv.value * (1.0 - hsv.saturation);
1850
1851         switch (i)
1852         {
1853             case 0:
1854                 red = hsv.value;
1855                 green = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
1856                 blue = p;
1857                 break;
1858
1859             case 1:
1860                 red = hsv.value * (1.0 - hsv.saturation * f);
1861                 green = hsv.value;
1862                 blue = p;
1863                 break;
1864
1865             case 2:
1866                 red = p;
1867                 green = hsv.value;
1868                 blue = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
1869                 break;
1870
1871             case 3:
1872                 red = p;
1873                 green = hsv.value * (1.0 - hsv.saturation * f);
1874                 blue = hsv.value;
1875                 break;
1876
1877             case 4:
1878                 red = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
1879                 green = p;
1880                 blue = hsv.value;
1881                 break;
1882
1883             default:    // case 5:
1884                 red = hsv.value;
1885                 green = p;
1886                 blue = hsv.value * (1.0 - hsv.saturation * f);
1887                 break;
1888         }
1889     }
1890
1891     return RGBValue((unsigned char)(red * 255.0),
1892                     (unsigned char)(green * 255.0),
1893                     (unsigned char)(blue * 255.0));
1894 }
1895
1896 /*
1897  * Rotates the hue of each pixel of the image. angle is a double in the range
1898  * -1.0..1.0 where -1.0 is -360 degrees and 1.0 is 360 degrees
1899  */
1900 void wxImage::RotateHue(double angle)
1901 {
1902     unsigned char *srcBytePtr;
1903     unsigned char *dstBytePtr;
1904     unsigned long count;
1905     wxImage::HSVValue hsv;
1906     wxImage::RGBValue rgb;
1907
1908     wxASSERT (angle >= -1.0 && angle <= 1.0);
1909     count = M_IMGDATA->m_width * M_IMGDATA->m_height;
1910     if ( count > 0 && !wxIsNullDouble(angle) )
1911     {
1912         srcBytePtr = M_IMGDATA->m_data;
1913         dstBytePtr = srcBytePtr;
1914         do
1915         {
1916             rgb.red = *srcBytePtr++;
1917             rgb.green = *srcBytePtr++;
1918             rgb.blue = *srcBytePtr++;
1919             hsv = RGBtoHSV(rgb);
1920
1921             hsv.hue = hsv.hue + angle;
1922             if (hsv.hue > 1.0)
1923                 hsv.hue = hsv.hue - 1.0;
1924             else if (hsv.hue < 0.0)
1925                 hsv.hue = hsv.hue + 1.0;
1926
1927             rgb = HSVtoRGB(hsv);
1928             *dstBytePtr++ = rgb.red;
1929             *dstBytePtr++ = rgb.green;
1930             *dstBytePtr++ = rgb.blue;
1931         } while (--count != 0);
1932     }
1933 }
1934
1935 //-----------------------------------------------------------------------------
1936 // wxImageHandler
1937 //-----------------------------------------------------------------------------
1938
1939 IMPLEMENT_ABSTRACT_CLASS(wxImageHandler,wxObject)
1940
1941 #if wxUSE_STREAMS
1942 bool wxImageHandler::LoadFile( wxImage *WXUNUSED(image), wxInputStream& WXUNUSED(stream), bool WXUNUSED(verbose), int WXUNUSED(index) )
1943 {
1944     return false;
1945 }
1946
1947 bool wxImageHandler::SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream), bool WXUNUSED(verbose) )
1948 {
1949     return false;
1950 }
1951
1952 int wxImageHandler::GetImageCount( wxInputStream& WXUNUSED(stream) )
1953 {
1954     return 1;
1955 }
1956
1957 bool wxImageHandler::CanRead( const wxString& name )
1958 {
1959     if (wxFileExists(name))
1960     {
1961         wxFileInputStream stream(name);
1962         return CanRead(stream);
1963     }
1964
1965     wxLogError( _("Can't check image format of file '%s': file does not exist."), name.c_str() );
1966
1967     return false;
1968 }
1969
1970 bool wxImageHandler::CallDoCanRead(wxInputStream& stream)
1971 {
1972     wxFileOffset posOld = stream.TellI();
1973     if ( posOld == wxInvalidOffset )
1974     {
1975         // can't test unseekable stream
1976         return false;
1977     }
1978
1979     bool ok = DoCanRead(stream);
1980
1981     // restore the old position to be able to test other formats and so on
1982     if ( stream.SeekI(posOld) == wxInvalidOffset )
1983     {
1984         wxLogDebug(_T("Failed to rewind the stream in wxImageHandler!"));
1985
1986         // reading would fail anyhow as we're not at the right position
1987         return false;
1988     }
1989
1990     return ok;
1991 }
1992
1993 #endif // wxUSE_STREAMS
1994
1995 // ----------------------------------------------------------------------------
1996 // image histogram stuff
1997 // ----------------------------------------------------------------------------
1998
1999 bool
2000 wxImageHistogram::FindFirstUnusedColour(unsigned char *r,
2001                                         unsigned char *g,
2002                                         unsigned char *b,
2003                                         unsigned char r2,
2004                                         unsigned char b2,
2005                                         unsigned char g2) const
2006 {
2007     unsigned long key = MakeKey(r2, g2, b2);
2008
2009     while ( find(key) != end() )
2010     {
2011         // color already used
2012         r2++;
2013         if ( r2 >= 255 )
2014         {
2015             r2 = 0;
2016             g2++;
2017             if ( g2 >= 255 )
2018             {
2019                 g2 = 0;
2020                 b2++;
2021                 if ( b2 >= 255 )
2022                 {
2023                     wxLogError(_("No unused colour in image.") );
2024                     return false;
2025                 }
2026             }
2027         }
2028
2029         key = MakeKey(r2, g2, b2);
2030     }
2031
2032     if ( r )
2033         *r = r2;
2034     if ( g )
2035         *g = g2;
2036     if ( b )
2037         *b = b2;
2038
2039     return true;
2040 }
2041
2042 bool
2043 wxImage::FindFirstUnusedColour(unsigned char *r,
2044                                unsigned char *g,
2045                                unsigned char *b,
2046                                unsigned char r2,
2047                                unsigned char b2,
2048                                unsigned char g2) const
2049 {
2050     wxImageHistogram histogram;
2051
2052     ComputeHistogram(histogram);
2053
2054     return histogram.FindFirstUnusedColour(r, g, b, r2, g2, b2);
2055 }
2056
2057
2058
2059 // GRG, Dic/99
2060 // Counts and returns the number of different colours. Optionally stops
2061 // when it exceeds 'stopafter' different colours. This is useful, for
2062 // example, to see if the image can be saved as 8-bit (256 colour or
2063 // less, in this case it would be invoked as CountColours(256)). Default
2064 // value for stopafter is -1 (don't care).
2065 //
2066 unsigned long wxImage::CountColours( unsigned long stopafter ) const
2067 {
2068     wxHashTable h;
2069     wxObject dummy;
2070     unsigned char r, g, b;
2071     unsigned char *p;
2072     unsigned long size, nentries, key;
2073
2074     p = GetData();
2075     size = GetWidth() * GetHeight();
2076     nentries = 0;
2077
2078     for (unsigned long j = 0; (j < size) && (nentries <= stopafter) ; j++)
2079     {
2080         r = *(p++);
2081         g = *(p++);
2082         b = *(p++);
2083         key = wxImageHistogram::MakeKey(r, g, b);
2084
2085         if (h.Get(key) == NULL)
2086         {
2087             h.Put(key, &dummy);
2088             nentries++;
2089         }
2090     }
2091
2092     return nentries;
2093 }
2094
2095
2096 unsigned long wxImage::ComputeHistogram( wxImageHistogram &h ) const
2097 {
2098     unsigned char *p = GetData();
2099     unsigned long nentries = 0;
2100
2101     h.clear();
2102
2103     const unsigned long size = GetWidth() * GetHeight();
2104
2105     unsigned char r, g, b;
2106     for ( unsigned long n = 0; n < size; n++ )
2107     {
2108         r = *p++;
2109         g = *p++;
2110         b = *p++;
2111
2112         wxImageHistogramEntry& entry = h[wxImageHistogram::MakeKey(r, g, b)];
2113
2114         if ( entry.value++ == 0 )
2115             entry.index = nentries++;
2116     }
2117
2118     return nentries;
2119 }
2120
2121 /*
2122  * Rotation code by Carlos Moreno
2123  */
2124
2125 // GRG: I've removed wxRotationPoint - we already have wxRealPoint which
2126 //      does exactly the same thing. And I also got rid of wxRotationPixel
2127 //      bacause of potential problems in architectures where alignment
2128 //      is an issue, so I had to rewrite parts of the code.
2129
2130 static const double gs_Epsilon = 1e-10;
2131
2132 static inline int wxCint (double x)
2133 {
2134     return (x > 0) ? (int) (x + 0.5) : (int) (x - 0.5);
2135 }
2136
2137
2138 // Auxiliary function to rotate a point (x,y) with respect to point p0
2139 // make it inline and use a straight return to facilitate optimization
2140 // also, the function receives the sine and cosine of the angle to avoid
2141 // repeating the time-consuming calls to these functions -- sin/cos can
2142 // be computed and stored in the calling function.
2143
2144 inline wxRealPoint rotated_point (const wxRealPoint & p, double cos_angle, double sin_angle, const wxRealPoint & p0)
2145 {
2146     return wxRealPoint (p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle,
2147                         p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle);
2148 }
2149
2150 inline wxRealPoint rotated_point (double x, double y, double cos_angle, double sin_angle, const wxRealPoint & p0)
2151 {
2152     return rotated_point (wxRealPoint(x,y), cos_angle, sin_angle, p0);
2153 }
2154
2155 wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool interpolating, wxPoint * offset_after_rotation) const
2156 {
2157     int i;
2158     angle = -angle;     // screen coordinates are a mirror image of "real" coordinates
2159
2160     bool has_alpha = HasAlpha();
2161
2162     // Create pointer-based array to accelerate access to wxImage's data
2163     unsigned char ** data = new unsigned char * [GetHeight()];
2164     data[0] = GetData();
2165     for (i = 1; i < GetHeight(); i++)
2166         data[i] = data[i - 1] + (3 * GetWidth());
2167
2168     // Same for alpha channel
2169     unsigned char ** alpha = NULL;
2170     if (has_alpha)
2171     {
2172         alpha = new unsigned char * [GetHeight()];
2173         alpha[0] = GetAlpha();
2174         for (i = 1; i < GetHeight(); i++)
2175             alpha[i] = alpha[i - 1] + GetWidth();
2176     }
2177
2178     // precompute coefficients for rotation formula
2179     // (sine and cosine of the angle)
2180     const double cos_angle = cos(angle);
2181     const double sin_angle = sin(angle);
2182
2183     // Create new Image to store the result
2184     // First, find rectangle that covers the rotated image;  to do that,
2185     // rotate the four corners
2186
2187     const wxRealPoint p0(centre_of_rotation.x, centre_of_rotation.y);
2188
2189     wxRealPoint p1 = rotated_point (0, 0, cos_angle, sin_angle, p0);
2190     wxRealPoint p2 = rotated_point (0, GetHeight(), cos_angle, sin_angle, p0);
2191     wxRealPoint p3 = rotated_point (GetWidth(), 0, cos_angle, sin_angle, p0);
2192     wxRealPoint p4 = rotated_point (GetWidth(), GetHeight(), cos_angle, sin_angle, p0);
2193
2194     int x1a = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x)));
2195     int y1a = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y)));
2196     int x2a = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x)));
2197     int y2a = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y)));
2198
2199     // Create rotated image
2200     wxImage rotated (x2a - x1a + 1, y2a - y1a + 1, false);
2201     // With alpha channel
2202     if (has_alpha)
2203         rotated.SetAlpha();
2204
2205     if (offset_after_rotation != NULL)
2206     {
2207         *offset_after_rotation = wxPoint (x1a, y1a);
2208     }
2209
2210     // GRG: The rotated (destination) image is always accessed
2211     //      sequentially, so there is no need for a pointer-based
2212     //      array here (and in fact it would be slower).
2213     //
2214     unsigned char * dst = rotated.GetData();
2215
2216     unsigned char * alpha_dst = NULL;
2217     if (has_alpha)
2218         alpha_dst = rotated.GetAlpha();
2219
2220     // GRG: if the original image has a mask, use its RGB values
2221     //      as the blank pixel, else, fall back to default (black).
2222     //
2223     unsigned char blank_r = 0;
2224     unsigned char blank_g = 0;
2225     unsigned char blank_b = 0;
2226
2227     if (HasMask())
2228     {
2229         blank_r = GetMaskRed();
2230         blank_g = GetMaskGreen();
2231         blank_b = GetMaskBlue();
2232         rotated.SetMaskColour( blank_r, blank_g, blank_b );
2233     }
2234
2235     // Now, for each point of the rotated image, find where it came from, by
2236     // performing an inverse rotation (a rotation of -angle) and getting the
2237     // pixel at those coordinates
2238
2239     // GRG: I've taken the (interpolating) test out of the loops, so that
2240     //      it is done only once, instead of repeating it for each pixel.
2241
2242     int x;
2243     if (interpolating)
2244     {
2245         for (int y = 0; y < rotated.GetHeight(); y++)
2246         {
2247             for (x = 0; x < rotated.GetWidth(); x++)
2248             {
2249                 wxRealPoint src = rotated_point (x + x1a, y + y1a, cos_angle, -sin_angle, p0);
2250
2251                 if (-0.25 < src.x && src.x < GetWidth() - 0.75 &&
2252                     -0.25 < src.y && src.y < GetHeight() - 0.75)
2253                 {
2254                     // interpolate using the 4 enclosing grid-points.  Those
2255                     // points can be obtained using floor and ceiling of the
2256                     // exact coordinates of the point
2257                     int x1, y1, x2, y2;
2258
2259                     if (0 < src.x && src.x < GetWidth() - 1)
2260                     {
2261                         x1 = wxCint(floor(src.x));
2262                         x2 = wxCint(ceil(src.x));
2263                     }
2264                     else    // else means that x is near one of the borders (0 or width-1)
2265                     {
2266                         x1 = x2 = wxCint (src.x);
2267                     }
2268
2269                     if (0 < src.y && src.y < GetHeight() - 1)
2270                     {
2271                         y1 = wxCint(floor(src.y));
2272                         y2 = wxCint(ceil(src.y));
2273                     }
2274                     else
2275                     {
2276                         y1 = y2 = wxCint (src.y);
2277                     }
2278
2279                     // get four points and the distances (square of the distance,
2280                     // for efficiency reasons) for the interpolation formula
2281
2282                     // GRG: Do not calculate the points until they are
2283                     //      really needed -- this way we can calculate
2284                     //      just one, instead of four, if d1, d2, d3
2285                     //      or d4 are < gs_Epsilon
2286
2287                     const double d1 = (src.x - x1) * (src.x - x1) + (src.y - y1) * (src.y - y1);
2288                     const double d2 = (src.x - x2) * (src.x - x2) + (src.y - y1) * (src.y - y1);
2289                     const double d3 = (src.x - x2) * (src.x - x2) + (src.y - y2) * (src.y - y2);
2290                     const double d4 = (src.x - x1) * (src.x - x1) + (src.y - y2) * (src.y - y2);
2291
2292                     // Now interpolate as a weighted average of the four surrounding
2293                     // points, where the weights are the distances to each of those points
2294
2295                     // If the point is exactly at one point of the grid of the source
2296                     // image, then don't interpolate -- just assign the pixel
2297
2298                     if (d1 < gs_Epsilon)        // d1,d2,d3,d4 are positive -- no need for abs()
2299                     {
2300                         unsigned char *p = data[y1] + (3 * x1);
2301                         *(dst++) = *(p++);
2302                         *(dst++) = *(p++);
2303                         *(dst++) = *p;
2304
2305                         if (has_alpha)
2306                             *(alpha_dst++) = *(alpha[y1] + x1);
2307                     }
2308                     else if (d2 < gs_Epsilon)
2309                     {
2310                         unsigned char *p = data[y1] + (3 * x2);
2311                         *(dst++) = *(p++);
2312                         *(dst++) = *(p++);
2313                         *(dst++) = *p;
2314
2315                         if (has_alpha)
2316                             *(alpha_dst++) = *(alpha[y1] + x2);
2317                     }
2318                     else if (d3 < gs_Epsilon)
2319                     {
2320                         unsigned char *p = data[y2] + (3 * x2);
2321                         *(dst++) = *(p++);
2322                         *(dst++) = *(p++);
2323                         *(dst++) = *p;
2324
2325                         if (has_alpha)
2326                             *(alpha_dst++) = *(alpha[y2] + x2);
2327                     }
2328                     else if (d4 < gs_Epsilon)
2329                     {
2330                         unsigned char *p = data[y2] + (3 * x1);
2331                         *(dst++) = *(p++);
2332                         *(dst++) = *(p++);
2333                         *(dst++) = *p;
2334
2335                         if (has_alpha)
2336                             *(alpha_dst++) = *(alpha[y2] + x1);
2337                     }
2338                     else
2339                     {
2340                         // weights for the weighted average are proportional to the inverse of the distance
2341                         unsigned char *v1 = data[y1] + (3 * x1);
2342                         unsigned char *v2 = data[y1] + (3 * x2);
2343                         unsigned char *v3 = data[y2] + (3 * x2);
2344                         unsigned char *v4 = data[y2] + (3 * x1);
2345
2346                         const double w1 = 1/d1, w2 = 1/d2, w3 = 1/d3, w4 = 1/d4;
2347
2348                         // GRG: Unrolled.
2349
2350                         *(dst++) = (unsigned char)
2351                             ( (w1 * *(v1++) + w2 * *(v2++) +
2352                                w3 * *(v3++) + w4 * *(v4++)) /
2353                               (w1 + w2 + w3 + w4) );
2354                         *(dst++) = (unsigned char)
2355                             ( (w1 * *(v1++) + w2 * *(v2++) +
2356                                w3 * *(v3++) + w4 * *(v4++)) /
2357                               (w1 + w2 + w3 + w4) );
2358                         *(dst++) = (unsigned char)
2359                             ( (w1 * *v1 + w2 * *v2 +
2360                                w3 * *v3 + w4 * *v4) /
2361                               (w1 + w2 + w3 + w4) );
2362
2363                         if (has_alpha)
2364                         {
2365                             v1 = alpha[y1] + (x1);
2366                             v2 = alpha[y1] + (x2);
2367                             v3 = alpha[y2] + (x2);
2368                             v4 = alpha[y2] + (x1);
2369
2370                             *(alpha_dst++) = (unsigned char)
2371                                 ( (w1 * *v1 + w2 * *v2 +
2372                                    w3 * *v3 + w4 * *v4) /
2373                                   (w1 + w2 + w3 + w4) );
2374                         }
2375                     }
2376                 }
2377                 else
2378                 {
2379                     *(dst++) = blank_r;
2380                     *(dst++) = blank_g;
2381                     *(dst++) = blank_b;
2382
2383                     if (has_alpha)
2384                         *(alpha_dst++) = 0;
2385                 }
2386             }
2387         }
2388     }
2389     else    // not interpolating
2390     {
2391         for (int y = 0; y < rotated.GetHeight(); y++)
2392         {
2393             for (x = 0; x < rotated.GetWidth(); x++)
2394             {
2395                 wxRealPoint src = rotated_point (x + x1a, y + y1a, cos_angle, -sin_angle, p0);
2396
2397                 const int xs = wxCint (src.x);      // wxCint rounds to the
2398                 const int ys = wxCint (src.y);      // closest integer
2399
2400                 if (0 <= xs && xs < GetWidth() &&
2401                     0 <= ys && ys < GetHeight())
2402                 {
2403                     unsigned char *p = data[ys] + (3 * xs);
2404                     *(dst++) = *(p++);
2405                     *(dst++) = *(p++);
2406                     *(dst++) = *p;
2407
2408                     if (has_alpha)
2409                         *(alpha_dst++) = *(alpha[ys] + (xs));
2410                 }
2411                 else
2412                 {
2413                     *(dst++) = blank_r;
2414                     *(dst++) = blank_g;
2415                     *(dst++) = blank_b;
2416
2417                     if (has_alpha)
2418                         *(alpha_dst++) = 255;
2419                 }
2420             }
2421         }
2422     }
2423
2424     delete [] data;
2425
2426     if (has_alpha)
2427         delete [] alpha;
2428
2429     return rotated;
2430 }
2431
2432
2433
2434
2435
2436 // A module to allow wxImage initialization/cleanup
2437 // without calling these functions from app.cpp or from
2438 // the user's application.
2439
2440 class wxImageModule: public wxModule
2441 {
2442 DECLARE_DYNAMIC_CLASS(wxImageModule)
2443 public:
2444     wxImageModule() {}
2445     bool OnInit() { wxImage::InitStandardHandlers(); return true; };
2446     void OnExit() { wxImage::CleanUpHandlers(); };
2447 };
2448
2449 IMPLEMENT_DYNAMIC_CLASS(wxImageModule, wxModule)
2450
2451
2452 #endif // wxUSE_IMAGE