src/common/image.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        image.cpp
   3 // Purpose:     wxImage
   4 // Author:      Robert Roebling
   5 // RCS-ID:      $Id$
   6 // Copyright:   (c) Robert Roebling
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  11 #pragma implementation "image.h"
  12 #endif
  13
  14 // For compilers that support precompilation, includes "wx.h".
  15 #include "wx/wxprec.h"
  16
  17 #ifdef __BORLANDC__
  18     #pragma hdrstop
  19 #endif
  20
  21 #include "wx/defs.h"
  22
  23 #if wxUSE_IMAGE
  24
  25 #include "wx/image.h"
  26 #include "wx/bitmap.h"
  27 #include "wx/debug.h"
  28 #include "wx/log.h"
  29 #include "wx/app.h"
  30 #include "wx/filefn.h"
  31 #include "wx/wfstream.h"
  32 #include "wx/intl.h"
  33 #include "wx/module.h"
  34 #include "wx/hash.h"
  35 #include "wx/utils.h"
  36
  37 // For memcpy
  38 #include <string.h>
  39 #include <math.h>
  40
  41 #ifdef __SALFORDC__
  42     #undef FAR
  43 #endif
  44
  45
  46 //-----------------------------------------------------------------------------
  47 // wxImage
  48 //-----------------------------------------------------------------------------
  49
  50 class wxImageRefData: public wxObjectRefData
  51 {
  52 public:
  53     wxImageRefData();
  54     virtual ~wxImageRefData();
  55
  56     int             m_width;
  57     int             m_height;
  58     unsigned char  *m_data;
  59
  60     bool            m_hasMask;
  61     unsigned char   m_maskRed,m_maskGreen,m_maskBlue;
  62
  63     // alpha channel data, may be NULL for the formats without alpha support
  64     unsigned char  *m_alpha;
  65
  66     bool            m_ok;
  67     bool            m_static;
  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 = false;
  93 }
  94
  95 wxImageRefData::~wxImageRefData()
  96 {
  97     if ( !m_static )
  98         free( m_data );
  99
 100     free(m_alpha);
 101 }
 102
 103 wxList wxImage::sm_handlers;
 104
 105 wxImage wxNullImage;
 106
 107 //-----------------------------------------------------------------------------
 108
 109 #define M_IMGDATA ((wxImageRefData *)m_refData)
 110
 111 IMPLEMENT_DYNAMIC_CLASS(wxImage, wxObject)
 112
 113 wxImage::wxImage()
 114 {
 115 }
 116
 117 wxImage::wxImage( int width, int height, bool clear )
 118 {
 119     Create( width, height, clear );
 120 }
 121
 122 wxImage::wxImage( int width, int height, unsigned char* data, bool static_data )
 123 {
 124     Create( width, height, data, static_data );
 125 }
 126
 127 wxImage::wxImage( const wxString& name, long type, int index )
 128 {
 129     LoadFile( name, type, index );
 130 }
 131
 132 wxImage::wxImage( const wxString& name, const wxString& mimetype, int index )
 133 {
 134     LoadFile( name, mimetype, index );
 135 }
 136
 137 #if wxUSE_STREAMS
 138 wxImage::wxImage( wxInputStream& stream, long type, int index )
 139 {
 140     LoadFile( stream, type, index );
 141 }
 142
 143 wxImage::wxImage( wxInputStream& stream, const wxString& mimetype, int index )
 144 {
 145     LoadFile( stream, mimetype, index );
 146 }
 147 #endif // wxUSE_STREAMS
 148
 149 wxImage::wxImage( const wxImage& image )
 150     : wxObject()
 151 {
 152     Ref(image);
 153 }
 154
 155 wxImage::wxImage( const wxImage* image )
 156 {
 157     if (image) Ref(*image);
 158 }
 159
 160 bool wxImage::Create( int width, int height, bool clear )
 161 {
 162     UnRef();
 163
 164     m_refData = new wxImageRefData();
 165
 166     M_IMGDATA->m_data = (unsigned char *) malloc( width*height*3 );
 167     if (!M_IMGDATA->m_data)
 168     {
 169         UnRef();
 170         return false;
 171     }
 172
 173     if (clear)
 174         memset(M_IMGDATA->m_data, 0, width*height*3);
 175
 176     M_IMGDATA->m_width = width;
 177     M_IMGDATA->m_height = height;
 178     M_IMGDATA->m_ok = true;
 179
 180     return true;
 181 }
 182
 183 bool wxImage::Create( int width, int height, unsigned char* data, bool static_data )
 184 {
 185     UnRef();
 186
 187     wxCHECK_MSG( data, false, _T("NULL data in wxImage::Create") );
 188
 189     m_refData = new wxImageRefData();
 190
 191     M_IMGDATA->m_data = data;
 192     M_IMGDATA->m_width = width;
 193     M_IMGDATA->m_height = height;
 194     M_IMGDATA->m_ok = true;
 195     M_IMGDATA->m_static = static_data;
 196
 197     return true;
 198 }
 199
 200 void wxImage::Destroy()
 201 {
 202     UnRef();
 203 }
 204
 205 wxImage wxImage::Copy() const
 206 {
 207     wxImage image;
 208
 209     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 210
 211     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 212
 213     unsigned char *data = image.GetData();
 214
 215     wxCHECK_MSG( data, image, wxT("unable to create image") );
 216
 217     image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 218     image.SetMask( M_IMGDATA->m_hasMask );
 219
 220     memcpy( data, GetData(), M_IMGDATA->m_width*M_IMGDATA->m_height*3 );
 221
 222     // also copy the image options
 223     wxImageRefData *imgData = (wxImageRefData *)image.m_refData;
 224     imgData->m_optionNames = M_IMGDATA->m_optionNames;
 225     imgData->m_optionValues = M_IMGDATA->m_optionValues;
 226
 227     return image;
 228 }
 229
 230 wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const
 231 {
 232     if( xFactor == 1 && yFactor == 1 )
 233         return Copy() ;
 234
 235     wxImage image;
 236
 237     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 238
 239     // can't scale to/from 0 size
 240     wxCHECK_MSG( (xFactor > 0) && (yFactor > 0), image,
 241                  wxT("invalid new image size") );
 242
 243     long old_height = M_IMGDATA->m_height,
 244          old_width  = M_IMGDATA->m_width;
 245
 246     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 247                  wxT("invalid old image size") );
 248
 249     long width = old_width / xFactor ;
 250     long height = old_height / yFactor ;
 251
 252     image.Create( width, height, false );
 253
 254     char unsigned *data = image.GetData();
 255
 256     wxCHECK_MSG( data, image, wxT("unable to create image") );
 257
 258     bool hasMask = false ;
 259     unsigned char maskRed = 0;
 260     unsigned char maskGreen = 0;
 261     unsigned char maskBlue =0 ;
 262     if (M_IMGDATA->m_hasMask)
 263     {
 264         hasMask = true ;
 265         maskRed = M_IMGDATA->m_maskRed;
 266         maskGreen = M_IMGDATA->m_maskGreen;
 267         maskBlue =M_IMGDATA->m_maskBlue ;
 268
 269         image.SetMaskColour( M_IMGDATA->m_maskRed,
 270                              M_IMGDATA->m_maskGreen,
 271                              M_IMGDATA->m_maskBlue );
 272     }
 273     char unsigned *source_data = M_IMGDATA->m_data;
 274     char unsigned *target_data = data;
 275
 276     for (long y = 0; y < height; y++)
 277     {
 278         for (long x = 0; x < width; x++)
 279         {
 280             unsigned long avgRed = 0 ;
 281             unsigned long avgGreen = 0;
 282             unsigned long avgBlue = 0;
 283             unsigned long counter = 0 ;
 284             // determine average
 285             for ( int y1 = 0 ; y1 < yFactor ; ++y1 )
 286             {
 287                 long y_offset = (y * yFactor + y1) * old_width;
 288                 for ( int x1 = 0 ; x1 < xFactor ; ++x1 )
 289                 {
 290                     unsigned char *pixel = source_data + 3 * ( y_offset + x * xFactor + x1 ) ;
 291                     unsigned char red = pixel[0] ;
 292                     unsigned char green = pixel[1] ;
 293                     unsigned char blue = pixel[2] ;
 294                     if ( !hasMask || red != maskRed || green != maskGreen || blue != maskBlue )
 295                     {
 296                         avgRed += red ;
 297                         avgGreen += green ;
 298                         avgBlue += blue ;
 299                         counter++ ;
 300                     }
 301                 }
 302             }
 303             if ( counter == 0 )
 304             {
 305                 *(target_data++) = M_IMGDATA->m_maskRed ;
 306                 *(target_data++) = M_IMGDATA->m_maskGreen ;
 307                 *(target_data++) = M_IMGDATA->m_maskBlue ;
 308             }
 309             else
 310             {
 311                 *(target_data++) = (unsigned char)(avgRed / counter);
 312                 *(target_data++) = (unsigned char)(avgGreen / counter);
 313                 *(target_data++) = (unsigned char)(avgBlue / counter);
 314             }
 315         }
 316     }
 317
 318     // In case this is a cursor, make sure the hotspot is scalled accordingly:
 319     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
 320         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
 321                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X))/xFactor);
 322     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
 323         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
 324                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y))/yFactor);
 325
 326     return image;
 327 }
 328
 329 wxImage wxImage::Scale( int width, int height ) const
 330 {
 331     wxImage image;
 332
 333     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 334
 335     // can't scale to/from 0 size
 336     wxCHECK_MSG( (width > 0) && (height > 0), image,
 337                  wxT("invalid new image size") );
 338
 339     long old_height = M_IMGDATA->m_height,
 340          old_width  = M_IMGDATA->m_width;
 341     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 342                  wxT("invalid old image size") );
 343
 344     if ( old_width % width == 0 && old_width >= width &&
 345         old_height % height == 0 && old_height >= height )
 346     {
 347         return ShrinkBy( old_width / width , old_height / height ) ;
 348     }
 349     image.Create( width, height, false );
 350
 351     unsigned char *data = image.GetData();
 352
 353     wxCHECK_MSG( data, image, wxT("unable to create image") );
 354
 355     if (M_IMGDATA->m_hasMask)
 356     {
 357         image.SetMaskColour( M_IMGDATA->m_maskRed,
 358                              M_IMGDATA->m_maskGreen,
 359                              M_IMGDATA->m_maskBlue );
 360     }
 361
 362     unsigned char *source_data = M_IMGDATA->m_data;
 363     unsigned char *target_data = data;
 364
 365     long x_delta = (old_width<<16) / width;
 366     long y_delta = (old_height<<16) / height;
 367
 368     unsigned char* dest_pixel = target_data;
 369
 370     long y = 0;
 371     for ( long j = 0; j < height; j++ )
 372         {
 373         unsigned char* src_line = &source_data[(y>>16)*old_width*3];
 374
 375         long x = 0;
 376         for ( long i = 0; i < width; i++ )
 377         {
 378              unsigned char* src_pixel = &src_line[(x>>16)*3];
 379              dest_pixel[0] = src_pixel[0];
 380              dest_pixel[1] = src_pixel[1];
 381              dest_pixel[2] = src_pixel[2];
 382              dest_pixel += 3;
 383              x += x_delta;
 384         }
 385
 386         y += y_delta;
 387     }
 388
 389     // In case this is a cursor, make sure the hotspot is scalled accordingly:
 390     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
 391         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
 392                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X)*width)/old_width);
 393     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
 394         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
 395                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y)*height)/old_height);
 396
 397     return image;
 398 }
 399
 400 wxImage wxImage::Rotate90( bool clockwise ) const
 401 {
 402     wxImage image;
 403
 404     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 405
 406     image.Create( M_IMGDATA->m_height, M_IMGDATA->m_width, false );
 407
 408     unsigned char *data = image.GetData();
 409
 410     wxCHECK_MSG( data, image, wxT("unable to create image") );
 411
 412     if (M_IMGDATA->m_hasMask)
 413         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 414
 415     long height = M_IMGDATA->m_height;
 416     long width  = M_IMGDATA->m_width;
 417
 418     unsigned char *source_data = M_IMGDATA->m_data;
 419     unsigned char *target_data;
 420
 421     for (long j = 0; j < height; j++)
 422     {
 423         for (long i = 0; i < width; i++)
 424         {
 425             if (clockwise)
 426                 target_data = data + (((i+1)*height) - j - 1)*3;
 427             else
 428                 target_data = data + ((height*(width-1)) + j - (i*height))*3;
 429             memcpy( target_data, source_data, 3 );
 430             source_data += 3;
 431         }
 432     }
 433
 434     return image;
 435 }
 436
 437 wxImage wxImage::Mirror( bool horizontally ) const
 438 {
 439     wxImage image;
 440
 441     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 442
 443     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 444
 445     unsigned char *data = image.GetData();
 446
 447     wxCHECK_MSG( data, image, wxT("unable to create image") );
 448
 449     if (M_IMGDATA->m_hasMask)
 450         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 451
 452     long height = M_IMGDATA->m_height;
 453     long width  = M_IMGDATA->m_width;
 454
 455     unsigned char *source_data = M_IMGDATA->m_data;
 456     unsigned char *target_data;
 457
 458     if (horizontally)
 459     {
 460         for (long j = 0; j < height; j++)
 461         {
 462             data += width*3;
 463             target_data = data-3;
 464             for (long i = 0; i < width; i++)
 465             {
 466                 memcpy( target_data, source_data, 3 );
 467                 source_data += 3;
 468                 target_data -= 3;
 469             }
 470         }
 471     }
 472     else
 473     {
 474         for (long i = 0; i < height; i++)
 475         {
 476             target_data = data + 3*width*(height-1-i);
 477             memcpy( target_data, source_data, (size_t)3*width );
 478             source_data += 3*width;
 479         }
 480     }
 481
 482     return image;
 483 }
 484
 485 wxImage wxImage::GetSubImage( const wxRect &rect ) const
 486 {
 487     wxImage image;
 488
 489     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 490
 491     wxCHECK_MSG( (rect.GetLeft()>=0) && (rect.GetTop()>=0) && (rect.GetRight()<=GetWidth()) && (rect.GetBottom()<=GetHeight()),
 492                  image, wxT("invalid subimage size") );
 493
 494     int subwidth=rect.GetWidth();
 495     const int subheight=rect.GetHeight();
 496
 497     image.Create( subwidth, subheight, false );
 498
 499     unsigned char *subdata = image.GetData(), *data=GetData();
 500
 501     wxCHECK_MSG( subdata, image, wxT("unable to create image") );
 502
 503     if (M_IMGDATA->m_hasMask)
 504         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 505
 506     const int subleft=3*rect.GetLeft();
 507     const int width=3*GetWidth();
 508     subwidth*=3;
 509
 510     data+=rect.GetTop()*width+subleft;
 511
 512     for (long j = 0; j < subheight; ++j)
 513     {
 514         memcpy( subdata, data, subwidth);
 515         subdata+=subwidth;
 516         data+=width;
 517     }
 518
 519     return image;
 520 }
 521
 522 void wxImage::Paste( const wxImage &image, int x, int y )
 523 {
 524     wxCHECK_RET( Ok(), wxT("invalid image") );
 525     wxCHECK_RET( image.Ok(), wxT("invalid image") );
 526
 527     int xx = 0;
 528     int yy = 0;
 529     int width = image.GetWidth();
 530     int height = image.GetHeight();
 531
 532     if (x < 0)
 533     {
 534         xx = -x;
 535         width += x;
 536     }
 537     if (y < 0)
 538     {
 539         yy = -y;
 540         height += y;
 541     }
 542
 543     if ((x+xx)+width > M_IMGDATA->m_width)
 544         width = M_IMGDATA->m_width - (x+xx);
 545     if ((y+yy)+height > M_IMGDATA->m_height)
 546         height = M_IMGDATA->m_height - (y+yy);
 547
 548     if (width < 1) return;
 549     if (height < 1) return;
 550
 551     if ((!HasMask() && !image.HasMask()) ||
 552        ((HasMask() && image.HasMask() &&
 553          (GetMaskRed()==image.GetMaskRed()) &&
 554          (GetMaskGreen()==image.GetMaskGreen()) &&
 555          (GetMaskBlue()==image.GetMaskBlue()))))
 556     {
 557         width *= 3;
 558         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 559         int source_step = image.GetWidth()*3;
 560
 561         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 562         int target_step = M_IMGDATA->m_width*3;
 563         for (int j = 0; j < height; j++)
 564         {
 565             memcpy( target_data, source_data, width );
 566             source_data += source_step;
 567             target_data += target_step;
 568         }
 569         return;
 570     }
 571
 572     if (!HasMask() && image.HasMask())
 573     {
 574         unsigned char r = image.GetMaskRed();
 575         unsigned char g = image.GetMaskGreen();
 576         unsigned char b = image.GetMaskBlue();
 577
 578         width *= 3;
 579         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 580         int source_step = image.GetWidth()*3;
 581
 582         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 583         int target_step = M_IMGDATA->m_width*3;
 584
 585         for (int j = 0; j < height; j++)
 586         {
 587             for (int i = 0; i < width; i+=3)
 588             {
 589                 if ((source_data[i]   != r) &&
 590                     (source_data[i+1] != g) &&
 591                     (source_data[i+2] != b))
 592                 {
 593                     memcpy( target_data+i, source_data+i, 3 );
 594                 }
 595             }
 596             source_data += source_step;
 597             target_data += target_step;
 598         }
 599     }
 600 }
 601
 602 void wxImage::Replace( unsigned char r1, unsigned char g1, unsigned char b1,
 603                        unsigned char r2, unsigned char g2, unsigned char b2 )
 604 {
 605     wxCHECK_RET( Ok(), wxT("invalid image") );
 606
 607     unsigned char *data = GetData();
 608
 609     const int w = GetWidth();
 610     const int h = GetHeight();
 611
 612     for (int j = 0; j < h; j++)
 613         for (int i = 0; i < w; i++)
 614         {
 615             if ((data[0] == r1) && (data[1] == g1) && (data[2] == b1))
 616             {
 617                 data[0] = r2;
 618                 data[1] = g2;
 619                 data[2] = b2;
 620             }
 621             data += 3;
 622         }
 623 }
 624
 625 wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const
 626 {
 627     wxImage image;
 628
 629     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 630
 631     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 632
 633     unsigned char *data = image.GetData();
 634
 635     wxCHECK_MSG( data, image, wxT("unable to create image") );
 636
 637     if (M_IMGDATA->m_hasMask)
 638     {
 639         if (M_IMGDATA->m_maskRed == r && M_IMGDATA->m_maskGreen == g &&
 640                                          M_IMGDATA->m_maskBlue == b)
 641             image.SetMaskColour( 255, 255, 255 );
 642         else
 643             image.SetMaskColour( 0, 0, 0 );
 644     }
 645
 646     long size = M_IMGDATA->m_height * M_IMGDATA->m_width;
 647
 648     unsigned char *srcd = M_IMGDATA->m_data;
 649     unsigned char *tard = image.GetData();
 650
 651     for ( long i = 0; i < size; i++, srcd += 3, tard += 3 )
 652     {
 653         if (srcd[0] == r && srcd[1] == g && srcd[2] == b)
 654             tard[0] = tard[1] = tard[2] = 255;
 655         else
 656             tard[0] = tard[1] = tard[2] = 0;
 657     }
 658
 659     return image;
 660 }
 661
 662 void wxImage::SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b )
 663 {
 664     wxCHECK_RET( Ok(), wxT("invalid image") );
 665
 666     int w = M_IMGDATA->m_width;
 667     int h = M_IMGDATA->m_height;
 668
 669     wxCHECK_RET( (x>=0) && (y>=0) && (x<w) && (y<h), wxT("invalid image index") );
 670
 671     long pos = (y * w + x) * 3;
 672
 673     M_IMGDATA->m_data[ pos   ] = r;
 674     M_IMGDATA->m_data[ pos+1 ] = g;
 675     M_IMGDATA->m_data[ pos+2 ] = b;
 676 }
 677
 678 unsigned char wxImage::GetRed( int x, int y ) const
 679 {
 680     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 681
 682     int w = M_IMGDATA->m_width;
 683     int h = M_IMGDATA->m_height;
 684
 685     wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
 686
 687     long pos = (y * w + x) * 3;
 688
 689     return M_IMGDATA->m_data[pos];
 690 }
 691
 692 unsigned char wxImage::GetGreen( int x, int y ) const
 693 {
 694     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 695
 696     int w = M_IMGDATA->m_width;
 697     int h = M_IMGDATA->m_height;
 698
 699     wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
 700
 701     long pos = (y * w + x) * 3;
 702
 703     return M_IMGDATA->m_data[pos+1];
 704 }
 705
 706 unsigned char wxImage::GetBlue( int x, int y ) const
 707 {
 708     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 709
 710     int w = M_IMGDATA->m_width;
 711     int h = M_IMGDATA->m_height;
 712
 713     wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
 714
 715     long pos = (y * w + x) * 3;
 716
 717     return M_IMGDATA->m_data[pos+2];
 718 }
 719
 720 bool wxImage::Ok() const
 721 {
 722     // image of 0 width or height can't be considered ok - at least because it
 723     // causes crashes in ConvertToBitmap() if we don't catch it in time
 724     wxImageRefData *data = M_IMGDATA;
 725     return data && data->m_ok && data->m_width && data->m_height;
 726 }
 727
 728 unsigned char *wxImage::GetData() const
 729 {
 730     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
 731
 732     return M_IMGDATA->m_data;
 733 }
 734
 735 void wxImage::SetData( unsigned char *data )
 736 {
 737     wxCHECK_RET( Ok(), wxT("invalid image") );
 738
 739     wxImageRefData *newRefData = new wxImageRefData();
 740
 741     newRefData->m_width = M_IMGDATA->m_width;
 742     newRefData->m_height = M_IMGDATA->m_height;
 743     newRefData->m_data = data;
 744     newRefData->m_ok = true;
 745     newRefData->m_maskRed = M_IMGDATA->m_maskRed;
 746     newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
 747     newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
 748     newRefData->m_hasMask = M_IMGDATA->m_hasMask;
 749
 750     UnRef();
 751
 752     m_refData = newRefData;
 753 }
 754
 755 void wxImage::SetData( unsigned char *data, int new_width, int new_height )
 756 {
 757     wxImageRefData *newRefData = new wxImageRefData();
 758
 759     if (m_refData)
 760     {
 761         newRefData->m_width = new_width;
 762         newRefData->m_height = new_height;
 763         newRefData->m_data = data;
 764         newRefData->m_ok = true;
 765         newRefData->m_maskRed = M_IMGDATA->m_maskRed;
 766         newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
 767         newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
 768         newRefData->m_hasMask = M_IMGDATA->m_hasMask;
 769     }
 770     else
 771     {
 772         newRefData->m_width = new_width;
 773         newRefData->m_height = new_height;
 774         newRefData->m_data = data;
 775         newRefData->m_ok = true;
 776     }
 777
 778     UnRef();
 779
 780     m_refData = newRefData;
 781 }
 782
 783 // ----------------------------------------------------------------------------
 784 // alpha channel support
 785 // ----------------------------------------------------------------------------
 786
 787 void wxImage::SetAlpha(int x, int y, unsigned char alpha)
 788 {
 789     wxCHECK_RET( Ok() && HasAlpha(), wxT("invalid image or no alpha channel") );
 790
 791     int w = M_IMGDATA->m_width,
 792         h = M_IMGDATA->m_height;
 793
 794     wxCHECK_RET( x >=0 && y >= 0 && x < w && y < h, wxT("invalid image index") );
 795
 796     M_IMGDATA->m_alpha[y*w + x] = alpha;
 797 }
 798
 799 unsigned char wxImage::GetAlpha(int x, int y) const
 800 {
 801     wxCHECK_MSG( Ok() && HasAlpha(), 0, wxT("invalid image or no alpha channel") );
 802
 803     int w = M_IMGDATA->m_width,
 804         h = M_IMGDATA->m_height;
 805
 806     wxCHECK_MSG( x >=0 && y >= 0 && x < w && y < h, 0, wxT("invalid image index") );
 807
 808     return M_IMGDATA->m_alpha[y*w + x];
 809 }
 810
 811 void wxImage::SetAlpha( unsigned char *alpha )
 812 {
 813     wxCHECK_RET( Ok(), wxT("invalid image") );
 814
 815     if ( !alpha )
 816     {
 817         alpha = (unsigned char *)malloc(M_IMGDATA->m_width*M_IMGDATA->m_height);
 818     }
 819
 820     free(M_IMGDATA->m_alpha);
 821     M_IMGDATA->m_alpha = alpha;
 822 }
 823
 824 unsigned char *wxImage::GetAlpha() const
 825 {
 826     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
 827
 828     return M_IMGDATA->m_alpha;
 829 }
 830
 831 // ----------------------------------------------------------------------------
 832 // mask support
 833 // ----------------------------------------------------------------------------
 834
 835 void wxImage::SetMaskColour( unsigned char r, unsigned char g, unsigned char b )
 836 {
 837     wxCHECK_RET( Ok(), wxT("invalid image") );
 838
 839     M_IMGDATA->m_maskRed = r;
 840     M_IMGDATA->m_maskGreen = g;
 841     M_IMGDATA->m_maskBlue = b;
 842     M_IMGDATA->m_hasMask = true;
 843 }
 844
 845 unsigned char wxImage::GetMaskRed() const
 846 {
 847     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 848
 849     return M_IMGDATA->m_maskRed;
 850 }
 851
 852 unsigned char wxImage::GetMaskGreen() const
 853 {
 854     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 855
 856     return M_IMGDATA->m_maskGreen;
 857 }
 858
 859 unsigned char wxImage::GetMaskBlue() const
 860 {
 861     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 862
 863     return M_IMGDATA->m_maskBlue;
 864 }
 865
 866 void wxImage::SetMask( bool mask )
 867 {
 868     wxCHECK_RET( Ok(), wxT("invalid image") );
 869
 870     M_IMGDATA->m_hasMask = mask;
 871 }
 872
 873 bool wxImage::HasMask() const
 874 {
 875     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
 876
 877     return M_IMGDATA->m_hasMask;
 878 }
 879
 880 int wxImage::GetWidth() const
 881 {
 882     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 883
 884     return M_IMGDATA->m_width;
 885 }
 886
 887 int wxImage::GetHeight() const
 888 {
 889     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 890
 891     return M_IMGDATA->m_height;
 892 }
 893
 894 bool wxImage::SetMaskFromImage(const wxImage& mask,
 895                                unsigned char mr, unsigned char mg, unsigned char mb)
 896 {
 897     // check that the images are the same size
 898     if ( (M_IMGDATA->m_height != mask.GetHeight() ) || (M_IMGDATA->m_width != mask.GetWidth () ) )
 899     {
 900         wxLogError( _("Image and mask have different sizes.") );
 901         return false;
 902     }
 903
 904     // find unused colour
 905     unsigned char r,g,b ;
 906     if (!FindFirstUnusedColour(&r, &g, &b))
 907     {
 908         wxLogError( _("No unused colour in image being masked.") );
 909         return false ;
 910     }
 911
 912     unsigned char *imgdata = GetData();
 913     unsigned char *maskdata = mask.GetData();
 914
 915     const int w = GetWidth();
 916     const int h = GetHeight();
 917
 918     for (int j = 0; j < h; j++)
 919     {
 920         for (int i = 0; i < w; i++)
 921         {
 922             if ((maskdata[0] == mr) && (maskdata[1]  == mg) && (maskdata[2] == mb))
 923             {
 924                 imgdata[0] = r;
 925                 imgdata[1] = g;
 926                 imgdata[2] = b;
 927             }
 928             imgdata  += 3;
 929             maskdata += 3;
 930         }
 931     }
 932
 933     SetMaskColour(r, g, b);
 934     SetMask(true);
 935
 936     return true;
 937 }
 938
 939 bool wxImage::ConvertAlphaToMask(unsigned threshold)
 940 {
 941     if (!HasAlpha())
 942         return true;
 943
 944     unsigned char mr, mg, mb;
 945     if (!FindFirstUnusedColour(&mr, &mg, &mb))
 946     {
 947         wxLogError( _("No unused colour in image being masked.") );
 948         return false;
 949     }
 950
 951     SetMask(true);
 952     SetMaskColour(mr, mg, mb);
 953
 954     unsigned char *imgdata = GetData();
 955     unsigned char *alphadata = GetAlpha();
 956
 957     size_t w = GetWidth();
 958     size_t h = GetHeight();
 959
 960     for (size_t y = 0; y < h; y++)
 961     {
 962         for (size_t x = 0; x < w; x++, imgdata += 3, alphadata++)
 963         {
 964             if (*alphadata < threshold)
 965             {
 966                 imgdata[0] = mr;
 967                 imgdata[1] = mg;
 968                 imgdata[2] = mb;
 969             }
 970         }
 971     }
 972
 973     free(M_IMGDATA->m_alpha);
 974     M_IMGDATA->m_alpha = NULL;
 975 }
 976
 977 #if wxUSE_PALETTE
 978
 979 // Palette functions
 980
 981 bool wxImage::HasPalette() const
 982 {
 983     if (!Ok())
 984         return false;
 985
 986     return M_IMGDATA->m_palette.Ok();
 987 }
 988
 989 const wxPalette& wxImage::GetPalette() const
 990 {
 991     wxCHECK_MSG( Ok(), wxNullPalette, wxT("invalid image") );
 992
 993     return M_IMGDATA->m_palette;
 994 }
 995
 996 void wxImage::SetPalette(const wxPalette& palette)
 997 {
 998     wxCHECK_RET( Ok(), wxT("invalid image") );
 999
1000     M_IMGDATA->m_palette = palette;
1001 }
1002
1003 #endif // wxUSE_PALETTE
1004
1005 // Option functions (arbitrary name/value mapping)
1006 void wxImage::SetOption(const wxString& name, const wxString& value)
1007 {
1008     wxCHECK_RET( Ok(), wxT("invalid image") );
1009
1010     int idx = M_IMGDATA->m_optionNames.Index(name, false);
1011     if (idx == wxNOT_FOUND)
1012     {
1013         M_IMGDATA->m_optionNames.Add(name);
1014         M_IMGDATA->m_optionValues.Add(value);
1015     }
1016     else
1017     {
1018         M_IMGDATA->m_optionNames[idx] = name;
1019         M_IMGDATA->m_optionValues[idx] = value;
1020     }
1021 }
1022
1023 void wxImage::SetOption(const wxString& name, int value)
1024 {
1025     wxString valStr;
1026     valStr.Printf(wxT("%d"), value);
1027     SetOption(name, valStr);
1028 }
1029
1030 wxString wxImage::GetOption(const wxString& name) const
1031 {
1032     wxCHECK_MSG( Ok(), wxEmptyString, wxT("invalid image") );
1033
1034     int idx = M_IMGDATA->m_optionNames.Index(name, false);
1035     if (idx == wxNOT_FOUND)
1036         return wxEmptyString;
1037     else
1038         return M_IMGDATA->m_optionValues[idx];
1039 }
1040
1041 int wxImage::GetOptionInt(const wxString& name) const
1042 {
1043     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1044
1045     return wxAtoi(GetOption(name));
1046 }
1047
1048 bool wxImage::HasOption(const wxString& name) const
1049 {
1050     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1051
1052     return (M_IMGDATA->m_optionNames.Index(name, false) != wxNOT_FOUND);
1053 }
1054
1055 bool wxImage::LoadFile( const wxString& filename, long type, int index )
1056 {
1057 #if wxUSE_STREAMS
1058     if (wxFileExists(filename))
1059     {
1060         wxFileInputStream stream(filename);
1061         wxBufferedInputStream bstream( stream );
1062         return LoadFile(bstream, type, index);
1063     }
1064     else
1065     {
1066         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
1067
1068         return false;
1069     }
1070 #else // !wxUSE_STREAMS
1071     return false;
1072 #endif // wxUSE_STREAMS
1073 }
1074
1075 bool wxImage::LoadFile( const wxString& filename, const wxString& mimetype, int index )
1076 {
1077 #if wxUSE_STREAMS
1078     if (wxFileExists(filename))
1079     {
1080         wxFileInputStream stream(filename);
1081         wxBufferedInputStream bstream( stream );
1082         return LoadFile(bstream, mimetype, index);
1083     }
1084     else
1085     {
1086         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
1087
1088         return false;
1089     }
1090 #else // !wxUSE_STREAMS
1091     return false;
1092 #endif // wxUSE_STREAMS
1093 }
1094
1095
1096
1097 bool wxImage::SaveFile( const wxString& filename ) const
1098 {
1099     wxString ext = filename.AfterLast('.').Lower();
1100
1101     wxImageHandler * pHandler = FindHandler(ext, -1);
1102     if (pHandler)
1103     {
1104         SaveFile(filename, pHandler->GetType());
1105         return true;
1106     }
1107
1108     wxLogError(_("Can't save image to file '%s': unknown extension."), filename.c_str());
1109
1110     return false;
1111 }
1112
1113 bool wxImage::SaveFile( const wxString& filename, int type ) const
1114 {
1115 #if wxUSE_STREAMS
1116     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
1117
1118     wxFileOutputStream stream(filename);
1119
1120     if ( stream.IsOk() )
1121     {
1122         wxBufferedOutputStream bstream( stream );
1123         return SaveFile(bstream, type);
1124     }
1125 #endif // wxUSE_STREAMS
1126
1127     return false;
1128 }
1129
1130 bool wxImage::SaveFile( const wxString& filename, const wxString& mimetype ) const
1131 {
1132 #if wxUSE_STREAMS
1133     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
1134
1135     wxFileOutputStream stream(filename);
1136
1137     if ( stream.IsOk() )
1138     {
1139         wxBufferedOutputStream bstream( stream );
1140         return SaveFile(bstream, mimetype);
1141     }
1142 #endif // wxUSE_STREAMS
1143
1144     return false;
1145 }
1146
1147 bool wxImage::CanRead( const wxString &name )
1148 {
1149 #if wxUSE_STREAMS
1150   wxFileInputStream stream(name);
1151   return CanRead(stream);
1152 #else
1153   return false;
1154 #endif
1155 }
1156
1157 int wxImage::GetImageCount( const wxString &name, long type )
1158 {
1159 #if wxUSE_STREAMS
1160   wxFileInputStream stream(name);
1161   if (stream.Ok())
1162       return GetImageCount(stream, type);
1163 #endif
1164
1165   return 0;
1166 }
1167
1168 #if wxUSE_STREAMS
1169
1170 bool wxImage::CanRead( wxInputStream &stream )
1171 {
1172     const wxList& list = GetHandlers();
1173
1174     for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
1175     {
1176         wxImageHandler *handler=(wxImageHandler*)node->GetData();
1177         if (handler->CanRead( stream ))
1178             return true;
1179     }
1180
1181     return false;
1182 }
1183
1184 int wxImage::GetImageCount( wxInputStream &stream, long type )
1185 {
1186     wxImageHandler *handler;
1187
1188     if ( type == wxBITMAP_TYPE_ANY )
1189     {
1190         wxList &list=GetHandlers();
1191
1192         for (wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext())
1193         {
1194              handler=(wxImageHandler*)node->GetData();
1195              if ( handler->CanRead(stream) )
1196                  return handler->GetImageCount(stream);
1197
1198         }
1199
1200         wxLogWarning(_("No handler found for image type."));
1201         return 0;
1202     }
1203
1204     handler = FindHandler(type);
1205
1206     if ( !handler )
1207     {
1208         wxLogWarning(_("No image handler for type %d defined."), type);
1209         return false;
1210     }
1211
1212     if ( handler->CanRead(stream) )
1213     {
1214         return handler->GetImageCount(stream);
1215     }
1216     else
1217     {
1218         wxLogError(_("Image file is not of type %d."), type);
1219         return 0;
1220     }
1221 }
1222
1223 bool wxImage::LoadFile( wxInputStream& stream, long type, int index )
1224 {
1225     UnRef();
1226
1227     m_refData = new wxImageRefData;
1228
1229     wxImageHandler *handler;
1230
1231     if ( type == wxBITMAP_TYPE_ANY )
1232     {
1233         wxList &list=GetHandlers();
1234
1235         for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
1236         {
1237              handler=(wxImageHandler*)node->GetData();
1238              if ( handler->CanRead(stream) )
1239                  return handler->LoadFile(this, stream, true/*verbose*/, index);
1240
1241         }
1242
1243         wxLogWarning( _("No handler found for image type.") );
1244         return false;
1245     }
1246
1247     handler = FindHandler(type);
1248
1249     if (handler == 0)
1250     {
1251         wxLogWarning( _("No image handler for type %d defined."), type );
1252
1253         return false;
1254     }
1255
1256     return handler->LoadFile(this, stream, true/*verbose*/, index);
1257 }
1258
1259 bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int index )
1260 {
1261     UnRef();
1262
1263     m_refData = new wxImageRefData;
1264
1265     wxImageHandler *handler = FindHandlerMime(mimetype);
1266
1267     if (handler == 0)
1268     {
1269         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1270
1271         return false;
1272     }
1273
1274     return handler->LoadFile( this, stream, true/*verbose*/, index );
1275 }
1276
1277 bool wxImage::SaveFile( wxOutputStream& stream, int type ) const
1278 {
1279     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1280
1281     wxImageHandler *handler = FindHandler(type);
1282
1283     if (handler == 0)
1284     {
1285         wxLogWarning( _("No image handler for type %d defined."), type );
1286
1287         return false;
1288     }
1289
1290     return handler->SaveFile( (wxImage*)this, stream );
1291 }
1292
1293 bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype ) const
1294 {
1295     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1296
1297     wxImageHandler *handler = FindHandlerMime(mimetype);
1298
1299     if (handler == 0)
1300     {
1301         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1302
1303         return false;
1304     }
1305
1306     return handler->SaveFile( (wxImage*)this, stream );
1307 }
1308 #endif // wxUSE_STREAMS
1309
1310 void wxImage::AddHandler( wxImageHandler *handler )
1311 {
1312     // Check for an existing handler of the type being added.
1313     if (FindHandler( handler->GetType() ) == 0)
1314     {
1315         sm_handlers.Append( handler );
1316     }
1317     else
1318     {
1319         // This is not documented behaviour, merely the simplest 'fix'
1320         // for preventing duplicate additions.  If someone ever has
1321         // a good reason to add and remove duplicate handlers (and they
1322         // may) we should probably refcount the duplicates.
1323         //   also an issue in InsertHandler below.
1324
1325         wxLogDebug( _T("Adding duplicate image handler for '%s'"),
1326                     handler->GetName().c_str() );
1327         delete handler;
1328     }
1329 }
1330
1331 void wxImage::InsertHandler( wxImageHandler *handler )
1332 {
1333     // Check for an existing handler of the type being added.
1334     if (FindHandler( handler->GetType() ) == 0)
1335     {
1336         sm_handlers.Insert( handler );
1337     }
1338     else
1339     {
1340         // see AddHandler for additional comments.
1341         wxLogDebug( _T("Inserting duplicate image handler for '%s'"),
1342                     handler->GetName().c_str() );
1343         delete handler;
1344     }
1345 }
1346
1347 bool wxImage::RemoveHandler( const wxString& name )
1348 {
1349     wxImageHandler *handler = FindHandler(name);
1350     if (handler)
1351     {
1352         sm_handlers.DeleteObject(handler);
1353         delete handler;
1354         return true;
1355     }
1356     else
1357         return false;
1358 }
1359
1360 wxImageHandler *wxImage::FindHandler( const wxString& name )
1361 {
1362     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1363     while (node)
1364     {
1365         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1366         if (handler->GetName().Cmp(name) == 0) return handler;
1367
1368         node = node->GetNext();
1369     }
1370     return 0;
1371 }
1372
1373 wxImageHandler *wxImage::FindHandler( const wxString& extension, long bitmapType )
1374 {
1375     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1376     while (node)
1377     {
1378         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1379         if ( (handler->GetExtension().Cmp(extension) == 0) &&
1380             (bitmapType == -1 || handler->GetType() == bitmapType) )
1381             return handler;
1382         node = node->GetNext();
1383     }
1384     return 0;
1385 }
1386
1387 wxImageHandler *wxImage::FindHandler( long bitmapType )
1388 {
1389     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1390     while (node)
1391     {
1392         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1393         if (handler->GetType() == bitmapType) return handler;
1394         node = node->GetNext();
1395     }
1396     return 0;
1397 }
1398
1399 wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype )
1400 {
1401     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1402     while (node)
1403     {
1404         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1405         if (handler->GetMimeType().IsSameAs(mimetype, false)) return handler;
1406         node = node->GetNext();
1407     }
1408     return 0;
1409 }
1410
1411 void wxImage::InitStandardHandlers()
1412 {
1413 #if wxUSE_STREAMS
1414     AddHandler(new wxBMPHandler);
1415 #endif // wxUSE_STREAMS
1416 }
1417
1418 void wxImage::CleanUpHandlers()
1419 {
1420     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1421     while (node)
1422     {
1423         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1424         wxList::compatibility_iterator next = node->GetNext();
1425         delete handler;
1426         node = next;
1427     }
1428
1429     sm_handlers.Clear();
1430 }
1431
1432 wxString wxImage::GetImageExtWildcard()
1433 {
1434     wxString fmts;
1435
1436     wxList& Handlers = wxImage::GetHandlers();
1437     wxList::compatibility_iterator Node = Handlers.GetFirst();
1438     while ( Node )
1439     {
1440         wxImageHandler* Handler = (wxImageHandler*)Node->GetData();
1441         fmts += wxT("*.") + Handler->GetExtension();
1442         Node = Node->GetNext();
1443         if ( Node ) fmts += wxT(";");
1444     }
1445
1446     return wxT("(") + fmts + wxT(")|") + fmts;
1447 }
1448
1449 //-----------------------------------------------------------------------------
1450 // wxImageHandler
1451 //-----------------------------------------------------------------------------
1452
1453 IMPLEMENT_ABSTRACT_CLASS(wxImageHandler,wxObject)
1454
1455 #if wxUSE_STREAMS
1456 bool wxImageHandler::LoadFile( wxImage *WXUNUSED(image), wxInputStream& WXUNUSED(stream), bool WXUNUSED(verbose), int WXUNUSED(index) )
1457 {
1458     return false;
1459 }
1460
1461 bool wxImageHandler::SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream), bool WXUNUSED(verbose) )
1462 {
1463     return false;
1464 }
1465
1466 int wxImageHandler::GetImageCount( wxInputStream& WXUNUSED(stream) )
1467 {
1468     return 1;
1469 }
1470
1471 bool wxImageHandler::CanRead( const wxString& name )
1472 {
1473     if (wxFileExists(name))
1474     {
1475         wxFileInputStream stream(name);
1476         return CanRead(stream);
1477     }
1478
1479     wxLogError( _("Can't check image format of file '%s': file does not exist."), name.c_str() );
1480
1481     return false;
1482 }
1483
1484 bool wxImageHandler::CallDoCanRead(wxInputStream& stream)
1485 {
1486     off_t posOld = stream.TellI();
1487     if ( posOld == wxInvalidOffset )
1488     {
1489         // can't test unseekable stream
1490         return false;
1491     }
1492
1493     bool ok = DoCanRead(stream);
1494
1495     // restore the old position to be able to test other formats and so on
1496     if ( stream.SeekI(posOld) == wxInvalidOffset )
1497     {
1498         wxLogDebug(_T("Failed to rewind the stream in wxImageHandler!"));
1499
1500         // reading would fail anyhow as we're not at the right position
1501         return false;
1502     }
1503
1504     return ok;
1505 }
1506
1507 #endif // wxUSE_STREAMS
1508
1509 // ----------------------------------------------------------------------------
1510 // image histogram stuff
1511 // ----------------------------------------------------------------------------
1512
1513 bool
1514 wxImageHistogram::FindFirstUnusedColour(unsigned char *r,
1515                                         unsigned char *g,
1516                                         unsigned char *b,
1517                                         unsigned char r2,
1518                                         unsigned char b2,
1519                                         unsigned char g2) const
1520 {
1521     unsigned long key = MakeKey(r2, g2, b2);
1522
1523     while ( find(key) != end() )
1524     {
1525         // color already used
1526         r2++;
1527         if ( r2 >= 255 )
1528         {
1529             r2 = 0;
1530             g2++;
1531             if ( g2 >= 255 )
1532             {
1533                 g2 = 0;
1534                 b2++;
1535                 if ( b2 >= 255 )
1536                 {
1537                     wxLogError(_("No unused colour in image.") );
1538                     return false;
1539                 }
1540             }
1541         }
1542
1543         key = MakeKey(r2, g2, b2);
1544     }
1545
1546     if ( r )
1547         *r = r2;
1548     if ( g )
1549         *g = g2;
1550     if ( b )
1551         *b = b2;
1552
1553     return true;
1554 }
1555
1556 bool
1557 wxImage::FindFirstUnusedColour(unsigned char *r,
1558                                unsigned char *g,
1559                                unsigned char *b,
1560                                unsigned char r2,
1561                                unsigned char b2,
1562                                unsigned char g2) const
1563 {
1564     wxImageHistogram histogram;
1565
1566     ComputeHistogram(histogram);
1567
1568     return histogram.FindFirstUnusedColour(r, g, b, r2, g2, b2);
1569 }
1570
1571
1572
1573 // GRG, Dic/99
1574 // Counts and returns the number of different colours. Optionally stops
1575 // when it exceeds 'stopafter' different colours. This is useful, for
1576 // example, to see if the image can be saved as 8-bit (256 colour or
1577 // less, in this case it would be invoked as CountColours(256)). Default
1578 // value for stopafter is -1 (don't care).
1579 //
1580 unsigned long wxImage::CountColours( unsigned long stopafter ) const
1581 {
1582     wxHashTable h;
1583     wxObject dummy;
1584     unsigned char r, g, b;
1585     unsigned char *p;
1586     unsigned long size, nentries, key;
1587
1588     p = GetData();
1589     size = GetWidth() * GetHeight();
1590     nentries = 0;
1591
1592     for (unsigned long j = 0; (j < size) && (nentries <= stopafter) ; j++)
1593     {
1594         r = *(p++);
1595         g = *(p++);
1596         b = *(p++);
1597         key = wxImageHistogram::MakeKey(r, g, b);
1598
1599         if (h.Get(key) == NULL)
1600         {
1601             h.Put(key, &dummy);
1602             nentries++;
1603         }
1604     }
1605
1606     return nentries;
1607 }
1608
1609
1610 unsigned long wxImage::ComputeHistogram( wxImageHistogram &h ) const
1611 {
1612     unsigned char *p = GetData();
1613     unsigned long nentries = 0;
1614
1615     h.clear();
1616
1617     const unsigned long size = GetWidth() * GetHeight();
1618
1619     unsigned char r, g, b;
1620     for ( unsigned long n = 0; n < size; n++ )
1621     {
1622         r = *p++;
1623         g = *p++;
1624         b = *p++;
1625
1626         wxImageHistogramEntry& entry = h[wxImageHistogram::MakeKey(r, g, b)];
1627
1628         if ( entry.value++ == 0 )
1629             entry.index = nentries++;
1630     }
1631
1632     return nentries;
1633 }
1634
1635 /*
1636  * Rotation code by Carlos Moreno
1637  */
1638
1639 // GRG: I've removed wxRotationPoint - we already have wxRealPoint which
1640 //      does exactly the same thing. And I also got rid of wxRotationPixel
1641 //      bacause of potential problems in architectures where alignment
1642 //      is an issue, so I had to rewrite parts of the code.
1643
1644 static const double gs_Epsilon = 1e-10;
1645
1646 static inline int wxCint (double x)
1647 {
1648     return (x > 0) ? (int) (x + 0.5) : (int) (x - 0.5);
1649 }
1650
1651
1652 // Auxiliary function to rotate a point (x,y) with respect to point p0
1653 // make it inline and use a straight return to facilitate optimization
1654 // also, the function receives the sine and cosine of the angle to avoid
1655 // repeating the time-consuming calls to these functions -- sin/cos can
1656 // be computed and stored in the calling function.
1657
1658 inline wxRealPoint rotated_point (const wxRealPoint & p, double cos_angle, double sin_angle, const wxRealPoint & p0)
1659 {
1660     return wxRealPoint (p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle,
1661                         p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle);
1662 }
1663
1664 inline wxRealPoint rotated_point (double x, double y, double cos_angle, double sin_angle, const wxRealPoint & p0)
1665 {
1666     return rotated_point (wxRealPoint(x,y), cos_angle, sin_angle, p0);
1667 }
1668
1669 wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool interpolating, wxPoint * offset_after_rotation) const
1670 {
1671     int i;
1672     angle = -angle;     // screen coordinates are a mirror image of "real" coordinates
1673
1674     // Create pointer-based array to accelerate access to wxImage's data
1675     unsigned char ** data = new unsigned char * [GetHeight()];
1676
1677     data[0] = GetData();
1678
1679     for (i = 1; i < GetHeight(); i++)
1680         data[i] = data[i - 1] + (3 * GetWidth());
1681
1682     // precompute coefficients for rotation formula
1683     // (sine and cosine of the angle)
1684     const double cos_angle = cos(angle);
1685     const double sin_angle = sin(angle);
1686
1687     // Create new Image to store the result
1688     // First, find rectangle that covers the rotated image;  to do that,
1689     // rotate the four corners
1690
1691     const wxRealPoint p0(centre_of_rotation.x, centre_of_rotation.y);
1692
1693     wxRealPoint p1 = rotated_point (0, 0, cos_angle, sin_angle, p0);
1694     wxRealPoint p2 = rotated_point (0, GetHeight(), cos_angle, sin_angle, p0);
1695     wxRealPoint p3 = rotated_point (GetWidth(), 0, cos_angle, sin_angle, p0);
1696     wxRealPoint p4 = rotated_point (GetWidth(), GetHeight(), cos_angle, sin_angle, p0);
1697
1698     int x1 = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x)));
1699     int y1 = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y)));
1700     int x2 = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x)));
1701     int y2 = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y)));
1702
1703     wxImage rotated (x2 - x1 + 1, y2 - y1 + 1, false);
1704
1705     if (offset_after_rotation != NULL)
1706     {
1707         *offset_after_rotation = wxPoint (x1, y1);
1708     }
1709
1710     // GRG: The rotated (destination) image is always accessed
1711     //      sequentially, so there is no need for a pointer-based
1712     //      array here (and in fact it would be slower).
1713     //
1714     unsigned char * dst = rotated.GetData();
1715
1716     // GRG: if the original image has a mask, use its RGB values
1717     //      as the blank pixel, else, fall back to default (black).
1718     //
1719     unsigned char blank_r = 0;
1720     unsigned char blank_g = 0;
1721     unsigned char blank_b = 0;
1722
1723     if (HasMask())
1724     {
1725         blank_r = GetMaskRed();
1726         blank_g = GetMaskGreen();
1727         blank_b = GetMaskBlue();
1728         rotated.SetMaskColour( blank_r, blank_g, blank_b );
1729     }
1730
1731     // Now, for each point of the rotated image, find where it came from, by
1732     // performing an inverse rotation (a rotation of -angle) and getting the
1733     // pixel at those coordinates
1734
1735     // GRG: I've taken the (interpolating) test out of the loops, so that
1736     //      it is done only once, instead of repeating it for each pixel.
1737
1738     int x;
1739     if (interpolating)
1740     {
1741         for (int y = 0; y < rotated.GetHeight(); y++)
1742         {
1743             for (x = 0; x < rotated.GetWidth(); x++)
1744             {
1745                 wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
1746
1747                 if (-0.25 < src.x && src.x < GetWidth() - 0.75 &&
1748                     -0.25 < src.y && src.y < GetHeight() - 0.75)
1749                 {
1750                     // interpolate using the 4 enclosing grid-points.  Those
1751                     // points can be obtained using floor and ceiling of the
1752                     // exact coordinates of the point
1753                         // C.M. 2000-02-17:  when the point is near the border, special care is required.
1754
1755                     int x1, y1, x2, y2;
1756
1757                     if (0 < src.x && src.x < GetWidth() - 1)
1758                     {
1759                         x1 = wxCint(floor(src.x));
1760                         x2 = wxCint(ceil(src.x));
1761                     }
1762                     else    // else means that x is near one of the borders (0 or width-1)
1763                     {
1764                         x1 = x2 = wxCint (src.x);
1765                     }
1766
1767                     if (0 < src.y && src.y < GetHeight() - 1)
1768                     {
1769                         y1 = wxCint(floor(src.y));
1770                         y2 = wxCint(ceil(src.y));
1771                     }
1772                     else
1773                     {
1774                         y1 = y2 = wxCint (src.y);
1775                     }
1776
1777                     // get four points and the distances (square of the distance,
1778                     // for efficiency reasons) for the interpolation formula
1779
1780                     // GRG: Do not calculate the points until they are
1781                     //      really needed -- this way we can calculate
1782                     //      just one, instead of four, if d1, d2, d3
1783                     //      or d4 are < gs_Epsilon
1784
1785                     const double d1 = (src.x - x1) * (src.x - x1) + (src.y - y1) * (src.y - y1);
1786                     const double d2 = (src.x - x2) * (src.x - x2) + (src.y - y1) * (src.y - y1);
1787                     const double d3 = (src.x - x2) * (src.x - x2) + (src.y - y2) * (src.y - y2);
1788                     const double d4 = (src.x - x1) * (src.x - x1) + (src.y - y2) * (src.y - y2);
1789
1790                     // Now interpolate as a weighted average of the four surrounding
1791                     // points, where the weights are the distances to each of those points
1792
1793                     // If the point is exactly at one point of the grid of the source
1794                     // image, then don't interpolate -- just assign the pixel
1795
1796                     if (d1 < gs_Epsilon)        // d1,d2,d3,d4 are positive -- no need for abs()
1797                     {
1798                         unsigned char *p = data[y1] + (3 * x1);
1799                         *(dst++) = *(p++);
1800                         *(dst++) = *(p++);
1801                         *(dst++) = *(p++);
1802                     }
1803                     else if (d2 < gs_Epsilon)
1804                     {
1805                         unsigned char *p = data[y1] + (3 * x2);
1806                         *(dst++) = *(p++);
1807                         *(dst++) = *(p++);
1808                         *(dst++) = *(p++);
1809                     }
1810                     else if (d3 < gs_Epsilon)
1811                     {
1812                         unsigned char *p = data[y2] + (3 * x2);
1813                         *(dst++) = *(p++);
1814                         *(dst++) = *(p++);
1815                         *(dst++) = *(p++);
1816                     }
1817                     else if (d4 < gs_Epsilon)
1818                     {
1819                         unsigned char *p = data[y2] + (3 * x1);
1820                         *(dst++) = *(p++);
1821                         *(dst++) = *(p++);
1822                         *(dst++) = *(p++);
1823                     }
1824                     else
1825                     {
1826                         // weights for the weighted average are proportional to the inverse of the distance
1827                         unsigned char *v1 = data[y1] + (3 * x1);
1828                         unsigned char *v2 = data[y1] + (3 * x2);
1829                         unsigned char *v3 = data[y2] + (3 * x2);
1830                         unsigned char *v4 = data[y2] + (3 * x1);
1831
1832                         const double w1 = 1/d1, w2 = 1/d2, w3 = 1/d3, w4 = 1/d4;
1833
1834                         // GRG: Unrolled.
1835
1836                         *(dst++) = (unsigned char)
1837                             ( (w1 * *(v1++) + w2 * *(v2++) +
1838                                w3 * *(v3++) + w4 * *(v4++)) /
1839                               (w1 + w2 + w3 + w4) );
1840                         *(dst++) = (unsigned char)
1841                             ( (w1 * *(v1++) + w2 * *(v2++) +
1842                                w3 * *(v3++) + w4 * *(v4++)) /
1843                               (w1 + w2 + w3 + w4) );
1844                         *(dst++) = (unsigned char)
1845                             ( (w1 * *v1 + w2 * *v2 +
1846                                w3 * *v3 + w4 * *v4) /
1847                               (w1 + w2 + w3 + w4) );
1848                     }
1849                 }
1850                 else
1851                 {
1852                     *(dst++) = blank_r;
1853                     *(dst++) = blank_g;
1854                     *(dst++) = blank_b;
1855                 }
1856             }
1857         }
1858     }
1859     else    // not interpolating
1860     {
1861         for (int y = 0; y < rotated.GetHeight(); y++)
1862         {
1863             for (x = 0; x < rotated.GetWidth(); x++)
1864             {
1865                 wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
1866
1867                 const int xs = wxCint (src.x);      // wxCint rounds to the
1868                 const int ys = wxCint (src.y);      // closest integer
1869
1870                 if (0 <= xs && xs < GetWidth() &&
1871                     0 <= ys && ys < GetHeight())
1872                 {
1873                     unsigned char *p = data[ys] + (3 * xs);
1874                     *(dst++) = *(p++);
1875                     *(dst++) = *(p++);
1876                     *(dst++) = *p;
1877                 }
1878                 else
1879                 {
1880                     *(dst++) = blank_r;
1881                     *(dst++) = blank_g;
1882                     *(dst++) = blank_b;
1883                 }
1884             }
1885         }
1886     }
1887
1888     delete [] data;
1889
1890     return rotated;
1891 }
1892
1893
1894
1895
1896
1897 // A module to allow wxImage initialization/cleanup
1898 // without calling these functions from app.cpp or from
1899 // the user's application.
1900
1901 class wxImageModule: public wxModule
1902 {
1903 DECLARE_DYNAMIC_CLASS(wxImageModule)
1904 public:
1905     wxImageModule() {}
1906     bool OnInit() { wxImage::InitStandardHandlers(); return true; };
1907     void OnExit() { wxImage::CleanUpHandlers(); };
1908 };
1909
1910 IMPLEMENT_DYNAMIC_CLASS(wxImageModule, wxModule)
1911
1912
1913 #endif // wxUSE_IMAGE