src/common/image.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        image.cpp
   3 // Purpose:     wxImage
   4 // Author:      Robert Roebling
   5 // RCS-ID:      $Id$
   6 // Copyright:   (c) Robert Roebling
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  11 #pragma implementation "image.h"
  12 #endif
  13
  14 // For compilers that support precompilation, includes "wx.h".
  15 #include "wx/wxprec.h"
  16
  17 #ifdef __BORLANDC__
  18     #pragma hdrstop
  19 #endif
  20
  21 #include "wx/defs.h"
  22
  23 #if wxUSE_IMAGE
  24
  25 #include "wx/image.h"
  26 #include "wx/bitmap.h"
  27 #include "wx/debug.h"
  28 #include "wx/log.h"
  29 #include "wx/app.h"
  30 #include "wx/filefn.h"
  31 #include "wx/wfstream.h"
  32 #include "wx/intl.h"
  33 #include "wx/module.h"
  34 #include "wx/hash.h"
  35 #include "wx/utils.h"
  36 #include "wx/math.h"
  37
  38 // For memcpy
  39 #include <string.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     {
  99         free( m_data );
 100         free( m_alpha );
 101     }
 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 bool wxImage::Create( int width, int height, bool clear )
 163 {
 164     UnRef();
 165
 166     m_refData = new wxImageRefData();
 167
 168     M_IMGDATA->m_data = (unsigned char *) malloc( width*height*3 );
 169     if (!M_IMGDATA->m_data)
 170     {
 171         UnRef();
 172         return false;
 173     }
 174
 175     if (clear)
 176         memset(M_IMGDATA->m_data, 0, width*height*3);
 177
 178     M_IMGDATA->m_width = width;
 179     M_IMGDATA->m_height = height;
 180     M_IMGDATA->m_ok = true;
 181
 182     return true;
 183 }
 184
 185 bool wxImage::Create( int width, int height, unsigned char* data, bool static_data )
 186 {
 187     UnRef();
 188
 189     wxCHECK_MSG( data, false, _T("NULL data in wxImage::Create") );
 190
 191     m_refData = new wxImageRefData();
 192
 193     M_IMGDATA->m_data = data;
 194     M_IMGDATA->m_width = width;
 195     M_IMGDATA->m_height = height;
 196     M_IMGDATA->m_ok = true;
 197     M_IMGDATA->m_static = static_data;
 198
 199     return true;
 200 }
 201
 202 bool wxImage::Create( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data )
 203 {
 204     UnRef();
 205
 206     wxCHECK_MSG( data, false, _T("NULL data in wxImage::Create") );
 207
 208     m_refData = new wxImageRefData();
 209
 210     M_IMGDATA->m_data = data;
 211     M_IMGDATA->m_alpha = alpha;
 212     M_IMGDATA->m_width = width;
 213     M_IMGDATA->m_height = height;
 214     M_IMGDATA->m_ok = true;
 215     M_IMGDATA->m_static = static_data;
 216
 217     return true;
 218 }
 219
 220 void wxImage::Destroy()
 221 {
 222     UnRef();
 223 }
 224
 225 wxImage wxImage::Copy() const
 226 {
 227     wxImage image;
 228
 229     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 230
 231     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 232
 233     unsigned char *data = image.GetData();
 234
 235     wxCHECK_MSG( data, image, wxT("unable to create image") );
 236
 237     image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 238     image.SetMask( M_IMGDATA->m_hasMask );
 239
 240     memcpy( data, GetData(), M_IMGDATA->m_width*M_IMGDATA->m_height*3 );
 241
 242     // also copy the image options
 243     wxImageRefData *imgData = (wxImageRefData *)image.m_refData;
 244     imgData->m_optionNames = M_IMGDATA->m_optionNames;
 245     imgData->m_optionValues = M_IMGDATA->m_optionValues;
 246
 247     return image;
 248 }
 249
 250 wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const
 251 {
 252     if( xFactor == 1 && yFactor == 1 )
 253         return Copy() ;
 254
 255     wxImage image;
 256
 257     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 258
 259     // can't scale to/from 0 size
 260     wxCHECK_MSG( (xFactor > 0) && (yFactor > 0), image,
 261                  wxT("invalid new image size") );
 262
 263     long old_height = M_IMGDATA->m_height,
 264          old_width  = M_IMGDATA->m_width;
 265
 266     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 267                  wxT("invalid old image size") );
 268
 269     long width = old_width / xFactor ;
 270     long height = old_height / yFactor ;
 271
 272     image.Create( width, height, false );
 273
 274     char unsigned *data = image.GetData();
 275
 276     wxCHECK_MSG( data, image, wxT("unable to create image") );
 277
 278     bool hasMask = false ;
 279     unsigned char maskRed = 0;
 280     unsigned char maskGreen = 0;
 281     unsigned char maskBlue =0 ;
 282     if (M_IMGDATA->m_hasMask)
 283     {
 284         hasMask = true ;
 285         maskRed = M_IMGDATA->m_maskRed;
 286         maskGreen = M_IMGDATA->m_maskGreen;
 287         maskBlue =M_IMGDATA->m_maskBlue ;
 288
 289         image.SetMaskColour( M_IMGDATA->m_maskRed,
 290                              M_IMGDATA->m_maskGreen,
 291                              M_IMGDATA->m_maskBlue );
 292     }
 293     char unsigned *source_data = M_IMGDATA->m_data;
 294     char unsigned *target_data = data;
 295
 296     for (long y = 0; y < height; y++)
 297     {
 298         for (long x = 0; x < width; x++)
 299         {
 300             unsigned long avgRed = 0 ;
 301             unsigned long avgGreen = 0;
 302             unsigned long avgBlue = 0;
 303             unsigned long counter = 0 ;
 304             // determine average
 305             for ( int y1 = 0 ; y1 < yFactor ; ++y1 )
 306             {
 307                 long y_offset = (y * yFactor + y1) * old_width;
 308                 for ( int x1 = 0 ; x1 < xFactor ; ++x1 )
 309                 {
 310                     unsigned char *pixel = source_data + 3 * ( y_offset + x * xFactor + x1 ) ;
 311                     unsigned char red = pixel[0] ;
 312                     unsigned char green = pixel[1] ;
 313                     unsigned char blue = pixel[2] ;
 314                     if ( !hasMask || red != maskRed || green != maskGreen || blue != maskBlue )
 315                     {
 316                         avgRed += red ;
 317                         avgGreen += green ;
 318                         avgBlue += blue ;
 319                         counter++ ;
 320                     }
 321                 }
 322             }
 323             if ( counter == 0 )
 324             {
 325                 *(target_data++) = M_IMGDATA->m_maskRed ;
 326                 *(target_data++) = M_IMGDATA->m_maskGreen ;
 327                 *(target_data++) = M_IMGDATA->m_maskBlue ;
 328             }
 329             else
 330             {
 331                 *(target_data++) = (unsigned char)(avgRed / counter);
 332                 *(target_data++) = (unsigned char)(avgGreen / counter);
 333                 *(target_data++) = (unsigned char)(avgBlue / counter);
 334             }
 335         }
 336     }
 337
 338     // In case this is a cursor, make sure the hotspot is scalled accordingly:
 339     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
 340         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
 341                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X))/xFactor);
 342     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
 343         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
 344                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y))/yFactor);
 345
 346     return image;
 347 }
 348
 349 wxImage wxImage::Scale( int width, int height ) const
 350 {
 351     wxImage image;
 352
 353     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 354
 355     // can't scale to/from 0 size
 356     wxCHECK_MSG( (width > 0) && (height > 0), image,
 357                  wxT("invalid new image size") );
 358
 359     long old_height = M_IMGDATA->m_height,
 360          old_width  = M_IMGDATA->m_width;
 361     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 362                  wxT("invalid old image size") );
 363
 364     if ( old_width % width == 0 && old_width >= width &&
 365         old_height % height == 0 && old_height >= height )
 366     {
 367         return ShrinkBy( old_width / width , old_height / height ) ;
 368     }
 369     image.Create( width, height, false );
 370
 371     unsigned char *data = image.GetData();
 372
 373     wxCHECK_MSG( data, image, wxT("unable to create image") );
 374
 375     if (M_IMGDATA->m_hasMask)
 376     {
 377         image.SetMaskColour( M_IMGDATA->m_maskRed,
 378                              M_IMGDATA->m_maskGreen,
 379                              M_IMGDATA->m_maskBlue );
 380     }
 381
 382     unsigned char *source_data = M_IMGDATA->m_data;
 383     unsigned char *target_data = data;
 384
 385     long x_delta = (old_width<<16) / width;
 386     long y_delta = (old_height<<16) / height;
 387
 388     unsigned char* dest_pixel = target_data;
 389
 390     long y = 0;
 391     for ( long j = 0; j < height; j++ )
 392         {
 393         unsigned char* src_line = &source_data[(y>>16)*old_width*3];
 394
 395         long x = 0;
 396         for ( long i = 0; i < width; i++ )
 397         {
 398              unsigned char* src_pixel = &src_line[(x>>16)*3];
 399              dest_pixel[0] = src_pixel[0];
 400              dest_pixel[1] = src_pixel[1];
 401              dest_pixel[2] = src_pixel[2];
 402              dest_pixel += 3;
 403              x += x_delta;
 404         }
 405
 406         y += y_delta;
 407     }
 408
 409     // In case this is a cursor, make sure the hotspot is scalled accordingly:
 410     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
 411         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
 412                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X)*width)/old_width);
 413     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
 414         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
 415                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y)*height)/old_height);
 416
 417     return image;
 418 }
 419
 420 wxImage wxImage::Rotate90( bool clockwise ) const
 421 {
 422     wxImage image;
 423
 424     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 425
 426     image.Create( M_IMGDATA->m_height, M_IMGDATA->m_width, false );
 427
 428     unsigned char *data = image.GetData();
 429
 430     wxCHECK_MSG( data, image, wxT("unable to create image") );
 431
 432     if (M_IMGDATA->m_hasMask)
 433         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 434
 435     long height = M_IMGDATA->m_height;
 436     long width  = M_IMGDATA->m_width;
 437
 438     unsigned char *source_data = M_IMGDATA->m_data;
 439     unsigned char *target_data;
 440
 441     for (long j = 0; j < height; j++)
 442     {
 443         for (long i = 0; i < width; i++)
 444         {
 445             if (clockwise)
 446                 target_data = data + (((i+1)*height) - j - 1)*3;
 447             else
 448                 target_data = data + ((height*(width-1)) + j - (i*height))*3;
 449             memcpy( target_data, source_data, 3 );
 450             source_data += 3;
 451         }
 452     }
 453
 454     return image;
 455 }
 456
 457 wxImage wxImage::Mirror( bool horizontally ) const
 458 {
 459     wxImage image;
 460
 461     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 462
 463     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 464
 465     unsigned char *data = image.GetData();
 466
 467     wxCHECK_MSG( data, image, wxT("unable to create image") );
 468
 469     if (M_IMGDATA->m_hasMask)
 470         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 471
 472     long height = M_IMGDATA->m_height;
 473     long width  = M_IMGDATA->m_width;
 474
 475     unsigned char *source_data = M_IMGDATA->m_data;
 476     unsigned char *target_data;
 477
 478     if (horizontally)
 479     {
 480         for (long j = 0; j < height; j++)
 481         {
 482             data += width*3;
 483             target_data = data-3;
 484             for (long i = 0; i < width; i++)
 485             {
 486                 memcpy( target_data, source_data, 3 );
 487                 source_data += 3;
 488                 target_data -= 3;
 489             }
 490         }
 491     }
 492     else
 493     {
 494         for (long i = 0; i < height; i++)
 495         {
 496             target_data = data + 3*width*(height-1-i);
 497             memcpy( target_data, source_data, (size_t)3*width );
 498             source_data += 3*width;
 499         }
 500     }
 501
 502     return image;
 503 }
 504
 505 wxImage wxImage::GetSubImage( const wxRect &rect ) const
 506 {
 507     wxImage image;
 508
 509     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 510
 511     wxCHECK_MSG( (rect.GetLeft()>=0) && (rect.GetTop()>=0) && (rect.GetRight()<=GetWidth()) && (rect.GetBottom()<=GetHeight()),
 512                  image, wxT("invalid subimage size") );
 513
 514     int subwidth=rect.GetWidth();
 515     const int subheight=rect.GetHeight();
 516
 517     image.Create( subwidth, subheight, false );
 518
 519     unsigned char *subdata = image.GetData(), *data=GetData();
 520
 521     wxCHECK_MSG( subdata, image, wxT("unable to create image") );
 522
 523     if (M_IMGDATA->m_hasMask)
 524         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 525
 526     const int subleft=3*rect.GetLeft();
 527     const int width=3*GetWidth();
 528     subwidth*=3;
 529
 530     data+=rect.GetTop()*width+subleft;
 531
 532     for (long j = 0; j < subheight; ++j)
 533     {
 534         memcpy( subdata, data, subwidth);
 535         subdata+=subwidth;
 536         data+=width;
 537     }
 538
 539     return image;
 540 }
 541
 542 void wxImage::Paste( const wxImage &image, int x, int y )
 543 {
 544     wxCHECK_RET( Ok(), wxT("invalid image") );
 545     wxCHECK_RET( image.Ok(), wxT("invalid image") );
 546
 547     int xx = 0;
 548     int yy = 0;
 549     int width = image.GetWidth();
 550     int height = image.GetHeight();
 551
 552     if (x < 0)
 553     {
 554         xx = -x;
 555         width += x;
 556     }
 557     if (y < 0)
 558     {
 559         yy = -y;
 560         height += y;
 561     }
 562
 563     if ((x+xx)+width > M_IMGDATA->m_width)
 564         width = M_IMGDATA->m_width - (x+xx);
 565     if ((y+yy)+height > M_IMGDATA->m_height)
 566         height = M_IMGDATA->m_height - (y+yy);
 567
 568     if (width < 1) return;
 569     if (height < 1) return;
 570
 571     if ((!HasMask() && !image.HasMask()) ||
 572        ((HasMask() && image.HasMask() &&
 573          (GetMaskRed()==image.GetMaskRed()) &&
 574          (GetMaskGreen()==image.GetMaskGreen()) &&
 575          (GetMaskBlue()==image.GetMaskBlue()))))
 576     {
 577         width *= 3;
 578         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 579         int source_step = image.GetWidth()*3;
 580
 581         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 582         int target_step = M_IMGDATA->m_width*3;
 583         for (int j = 0; j < height; j++)
 584         {
 585             memcpy( target_data, source_data, width );
 586             source_data += source_step;
 587             target_data += target_step;
 588         }
 589         return;
 590     }
 591
 592     if (!HasMask() && image.HasMask())
 593     {
 594         unsigned char r = image.GetMaskRed();
 595         unsigned char g = image.GetMaskGreen();
 596         unsigned char b = image.GetMaskBlue();
 597
 598         width *= 3;
 599         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 600         int source_step = image.GetWidth()*3;
 601
 602         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 603         int target_step = M_IMGDATA->m_width*3;
 604
 605         for (int j = 0; j < height; j++)
 606         {
 607             for (int i = 0; i < width; i+=3)
 608             {
 609                 if ((source_data[i]   != r) &&
 610                     (source_data[i+1] != g) &&
 611                     (source_data[i+2] != b))
 612                 {
 613                     memcpy( target_data+i, source_data+i, 3 );
 614                 }
 615             }
 616             source_data += source_step;
 617             target_data += target_step;
 618         }
 619     }
 620 }
 621
 622 void wxImage::Replace( unsigned char r1, unsigned char g1, unsigned char b1,
 623                        unsigned char r2, unsigned char g2, unsigned char b2 )
 624 {
 625     wxCHECK_RET( Ok(), wxT("invalid image") );
 626
 627     unsigned char *data = GetData();
 628
 629     const int w = GetWidth();
 630     const int h = GetHeight();
 631
 632     for (int j = 0; j < h; j++)
 633         for (int i = 0; i < w; i++)
 634         {
 635             if ((data[0] == r1) && (data[1] == g1) && (data[2] == b1))
 636             {
 637                 data[0] = r2;
 638                 data[1] = g2;
 639                 data[2] = b2;
 640             }
 641             data += 3;
 642         }
 643 }
 644
 645 wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const
 646 {
 647     wxImage image;
 648
 649     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 650
 651     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 652
 653     unsigned char *data = image.GetData();
 654
 655     wxCHECK_MSG( data, image, wxT("unable to create image") );
 656
 657     if (M_IMGDATA->m_hasMask)
 658     {
 659         if (M_IMGDATA->m_maskRed == r && M_IMGDATA->m_maskGreen == g &&
 660                                          M_IMGDATA->m_maskBlue == b)
 661             image.SetMaskColour( 255, 255, 255 );
 662         else
 663             image.SetMaskColour( 0, 0, 0 );
 664     }
 665
 666     long size = M_IMGDATA->m_height * M_IMGDATA->m_width;
 667
 668     unsigned char *srcd = M_IMGDATA->m_data;
 669     unsigned char *tard = image.GetData();
 670
 671     for ( long i = 0; i < size; i++, srcd += 3, tard += 3 )
 672     {
 673         if (srcd[0] == r && srcd[1] == g && srcd[2] == b)
 674             tard[0] = tard[1] = tard[2] = 255;
 675         else
 676             tard[0] = tard[1] = tard[2] = 0;
 677     }
 678
 679     return image;
 680 }
 681
 682 void wxImage::SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b )
 683 {
 684     wxCHECK_RET( Ok(), wxT("invalid image") );
 685
 686     int w = M_IMGDATA->m_width;
 687     int h = M_IMGDATA->m_height;
 688
 689     wxCHECK_RET( (x>=0) && (y>=0) && (x<w) && (y<h), wxT("invalid image index") );
 690
 691     long pos = (y * w + x) * 3;
 692
 693     M_IMGDATA->m_data[ pos   ] = r;
 694     M_IMGDATA->m_data[ pos+1 ] = g;
 695     M_IMGDATA->m_data[ pos+2 ] = b;
 696 }
 697
 698 unsigned char wxImage::GetRed( int x, int y ) const
 699 {
 700     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 701
 702     int w = M_IMGDATA->m_width;
 703     int h = M_IMGDATA->m_height;
 704
 705     wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
 706
 707     long pos = (y * w + x) * 3;
 708
 709     return M_IMGDATA->m_data[pos];
 710 }
 711
 712 unsigned char wxImage::GetGreen( int x, int y ) const
 713 {
 714     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 715
 716     int w = M_IMGDATA->m_width;
 717     int h = M_IMGDATA->m_height;
 718
 719     wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
 720
 721     long pos = (y * w + x) * 3;
 722
 723     return M_IMGDATA->m_data[pos+1];
 724 }
 725
 726 unsigned char wxImage::GetBlue( int x, int y ) const
 727 {
 728     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 729
 730     int w = M_IMGDATA->m_width;
 731     int h = M_IMGDATA->m_height;
 732
 733     wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
 734
 735     long pos = (y * w + x) * 3;
 736
 737     return M_IMGDATA->m_data[pos+2];
 738 }
 739
 740 bool wxImage::Ok() const
 741 {
 742     // image of 0 width or height can't be considered ok - at least because it
 743     // causes crashes in ConvertToBitmap() if we don't catch it in time
 744     wxImageRefData *data = M_IMGDATA;
 745     return data && data->m_ok && data->m_width && data->m_height;
 746 }
 747
 748 unsigned char *wxImage::GetData() const
 749 {
 750     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
 751
 752     return M_IMGDATA->m_data;
 753 }
 754
 755 void wxImage::SetData( unsigned char *data )
 756 {
 757     wxCHECK_RET( Ok(), wxT("invalid image") );
 758
 759     wxImageRefData *newRefData = new wxImageRefData();
 760
 761     newRefData->m_width = M_IMGDATA->m_width;
 762     newRefData->m_height = M_IMGDATA->m_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     UnRef();
 771
 772     m_refData = newRefData;
 773 }
 774
 775 void wxImage::SetData( unsigned char *data, int new_width, int new_height )
 776 {
 777     wxImageRefData *newRefData = new wxImageRefData();
 778
 779     if (m_refData)
 780     {
 781         newRefData->m_width = new_width;
 782         newRefData->m_height = new_height;
 783         newRefData->m_data = data;
 784         newRefData->m_ok = true;
 785         newRefData->m_maskRed = M_IMGDATA->m_maskRed;
 786         newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
 787         newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
 788         newRefData->m_hasMask = M_IMGDATA->m_hasMask;
 789     }
 790     else
 791     {
 792         newRefData->m_width = new_width;
 793         newRefData->m_height = new_height;
 794         newRefData->m_data = data;
 795         newRefData->m_ok = true;
 796     }
 797
 798     UnRef();
 799
 800     m_refData = newRefData;
 801 }
 802
 803 // ----------------------------------------------------------------------------
 804 // alpha channel support
 805 // ----------------------------------------------------------------------------
 806
 807 void wxImage::SetAlpha(int x, int y, unsigned char alpha)
 808 {
 809     wxCHECK_RET( Ok() && HasAlpha(), wxT("invalid image or no alpha channel") );
 810
 811     int w = M_IMGDATA->m_width,
 812         h = M_IMGDATA->m_height;
 813
 814     wxCHECK_RET( x >=0 && y >= 0 && x < w && y < h, wxT("invalid image index") );
 815
 816     M_IMGDATA->m_alpha[y*w + x] = alpha;
 817 }
 818
 819 unsigned char wxImage::GetAlpha(int x, int y) const
 820 {
 821     wxCHECK_MSG( Ok() && HasAlpha(), 0, wxT("invalid image or no alpha channel") );
 822
 823     int w = M_IMGDATA->m_width,
 824         h = M_IMGDATA->m_height;
 825
 826     wxCHECK_MSG( x >=0 && y >= 0 && x < w && y < h, 0, wxT("invalid image index") );
 827
 828     return M_IMGDATA->m_alpha[y*w + x];
 829 }
 830
 831 bool wxImage::ConvertColourToAlpha( unsigned char r, unsigned char g, unsigned char b )
 832 {
 833     SetAlpha( NULL );
 834
 835     int w = M_IMGDATA->m_width,
 836         h = M_IMGDATA->m_height;
 837
 838     unsigned char *alpha = GetAlpha();
 839     unsigned char *data = GetData();
 840
 841     int x,y;
 842     for (y = 0; y < h; y++)
 843         for (x = 0; x < w; x++)
 844             {
 845                 *alpha = *data;
 846                 alpha++;
 847                 *data = r;
 848                 data++;
 849                 *data = g;
 850                 data++;
 851                 *data = b;
 852                 data++;
 853             }
 854
 855     return true;
 856 }
 857
 858 void wxImage::SetAlpha( unsigned char *alpha )
 859 {
 860     wxCHECK_RET( Ok(), wxT("invalid image") );
 861
 862     if ( !alpha )
 863     {
 864         alpha = (unsigned char *)malloc(M_IMGDATA->m_width*M_IMGDATA->m_height);
 865     }
 866
 867     free(M_IMGDATA->m_alpha);
 868     M_IMGDATA->m_alpha = alpha;
 869 }
 870
 871 unsigned char *wxImage::GetAlpha() const
 872 {
 873     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
 874
 875     return M_IMGDATA->m_alpha;
 876 }
 877
 878 // ----------------------------------------------------------------------------
 879 // mask support
 880 // ----------------------------------------------------------------------------
 881
 882 void wxImage::SetMaskColour( unsigned char r, unsigned char g, unsigned char b )
 883 {
 884     wxCHECK_RET( Ok(), wxT("invalid image") );
 885
 886     M_IMGDATA->m_maskRed = r;
 887     M_IMGDATA->m_maskGreen = g;
 888     M_IMGDATA->m_maskBlue = b;
 889     M_IMGDATA->m_hasMask = true;
 890 }
 891
 892 unsigned char wxImage::GetMaskRed() const
 893 {
 894     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 895
 896     return M_IMGDATA->m_maskRed;
 897 }
 898
 899 unsigned char wxImage::GetMaskGreen() const
 900 {
 901     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 902
 903     return M_IMGDATA->m_maskGreen;
 904 }
 905
 906 unsigned char wxImage::GetMaskBlue() const
 907 {
 908     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 909
 910     return M_IMGDATA->m_maskBlue;
 911 }
 912
 913 void wxImage::SetMask( bool mask )
 914 {
 915     wxCHECK_RET( Ok(), wxT("invalid image") );
 916
 917     M_IMGDATA->m_hasMask = mask;
 918 }
 919
 920 bool wxImage::HasMask() const
 921 {
 922     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
 923
 924     return M_IMGDATA->m_hasMask;
 925 }
 926
 927 int wxImage::GetWidth() const
 928 {
 929     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 930
 931     return M_IMGDATA->m_width;
 932 }
 933
 934 int wxImage::GetHeight() const
 935 {
 936     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 937
 938     return M_IMGDATA->m_height;
 939 }
 940
 941 bool wxImage::SetMaskFromImage(const wxImage& mask,
 942                                unsigned char mr, unsigned char mg, unsigned char mb)
 943 {
 944     // check that the images are the same size
 945     if ( (M_IMGDATA->m_height != mask.GetHeight() ) || (M_IMGDATA->m_width != mask.GetWidth () ) )
 946     {
 947         wxLogError( _("Image and mask have different sizes.") );
 948         return false;
 949     }
 950
 951     // find unused colour
 952     unsigned char r,g,b ;
 953     if (!FindFirstUnusedColour(&r, &g, &b))
 954     {
 955         wxLogError( _("No unused colour in image being masked.") );
 956         return false ;
 957     }
 958
 959     unsigned char *imgdata = GetData();
 960     unsigned char *maskdata = mask.GetData();
 961
 962     const int w = GetWidth();
 963     const int h = GetHeight();
 964
 965     for (int j = 0; j < h; j++)
 966     {
 967         for (int i = 0; i < w; i++)
 968         {
 969             if ((maskdata[0] == mr) && (maskdata[1]  == mg) && (maskdata[2] == mb))
 970             {
 971                 imgdata[0] = r;
 972                 imgdata[1] = g;
 973                 imgdata[2] = b;
 974             }
 975             imgdata  += 3;
 976             maskdata += 3;
 977         }
 978     }
 979
 980     SetMaskColour(r, g, b);
 981     SetMask(true);
 982
 983     return true;
 984 }
 985
 986 bool wxImage::ConvertAlphaToMask(unsigned char threshold)
 987 {
 988     if (!HasAlpha())
 989         return true;
 990
 991     unsigned char mr, mg, mb;
 992     if (!FindFirstUnusedColour(&mr, &mg, &mb))
 993     {
 994         wxLogError( _("No unused colour in image being masked.") );
 995         return false;
 996     }
 997
 998     SetMask(true);
 999     SetMaskColour(mr, mg, mb);
1000
1001     unsigned char *imgdata = GetData();
1002     unsigned char *alphadata = GetAlpha();
1003
1004     int w = GetWidth();
1005     int h = GetHeight();
1006
1007     for (int y = 0; y < h; y++)
1008     {
1009         for (int x = 0; x < w; x++, imgdata += 3, alphadata++)
1010         {
1011             if (*alphadata < threshold)
1012             {
1013                 imgdata[0] = mr;
1014                 imgdata[1] = mg;
1015                 imgdata[2] = mb;
1016             }
1017         }
1018     }
1019
1020     free(M_IMGDATA->m_alpha);
1021     M_IMGDATA->m_alpha = NULL;
1022
1023     return true;
1024 }
1025
1026 #if wxUSE_PALETTE
1027
1028 // Palette functions
1029
1030 bool wxImage::HasPalette() const
1031 {
1032     if (!Ok())
1033         return false;
1034
1035     return M_IMGDATA->m_palette.Ok();
1036 }
1037
1038 const wxPalette& wxImage::GetPalette() const
1039 {
1040     wxCHECK_MSG( Ok(), wxNullPalette, wxT("invalid image") );
1041
1042     return M_IMGDATA->m_palette;
1043 }
1044
1045 void wxImage::SetPalette(const wxPalette& palette)
1046 {
1047     wxCHECK_RET( Ok(), wxT("invalid image") );
1048
1049     M_IMGDATA->m_palette = palette;
1050 }
1051
1052 #endif // wxUSE_PALETTE
1053
1054 // Option functions (arbitrary name/value mapping)
1055 void wxImage::SetOption(const wxString& name, const wxString& value)
1056 {
1057     wxCHECK_RET( Ok(), wxT("invalid image") );
1058
1059     int idx = M_IMGDATA->m_optionNames.Index(name, false);
1060     if (idx == wxNOT_FOUND)
1061     {
1062         M_IMGDATA->m_optionNames.Add(name);
1063         M_IMGDATA->m_optionValues.Add(value);
1064     }
1065     else
1066     {
1067         M_IMGDATA->m_optionNames[idx] = name;
1068         M_IMGDATA->m_optionValues[idx] = value;
1069     }
1070 }
1071
1072 void wxImage::SetOption(const wxString& name, int value)
1073 {
1074     wxString valStr;
1075     valStr.Printf(wxT("%d"), value);
1076     SetOption(name, valStr);
1077 }
1078
1079 wxString wxImage::GetOption(const wxString& name) const
1080 {
1081     wxCHECK_MSG( Ok(), wxEmptyString, wxT("invalid image") );
1082
1083     int idx = M_IMGDATA->m_optionNames.Index(name, false);
1084     if (idx == wxNOT_FOUND)
1085         return wxEmptyString;
1086     else
1087         return M_IMGDATA->m_optionValues[idx];
1088 }
1089
1090 int wxImage::GetOptionInt(const wxString& name) const
1091 {
1092     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1093
1094     return wxAtoi(GetOption(name));
1095 }
1096
1097 bool wxImage::HasOption(const wxString& name) const
1098 {
1099     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1100
1101     return (M_IMGDATA->m_optionNames.Index(name, false) != wxNOT_FOUND);
1102 }
1103
1104 bool wxImage::LoadFile( const wxString& filename, long type, int index )
1105 {
1106 #if wxUSE_STREAMS
1107     if (wxFileExists(filename))
1108     {
1109         wxFileInputStream stream(filename);
1110         wxBufferedInputStream bstream( stream );
1111         return LoadFile(bstream, type, index);
1112     }
1113     else
1114     {
1115         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
1116
1117         return false;
1118     }
1119 #else // !wxUSE_STREAMS
1120     return false;
1121 #endif // wxUSE_STREAMS
1122 }
1123
1124 bool wxImage::LoadFile( const wxString& filename, const wxString& mimetype, int index )
1125 {
1126 #if wxUSE_STREAMS
1127     if (wxFileExists(filename))
1128     {
1129         wxFileInputStream stream(filename);
1130         wxBufferedInputStream bstream( stream );
1131         return LoadFile(bstream, mimetype, index);
1132     }
1133     else
1134     {
1135         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
1136
1137         return false;
1138     }
1139 #else // !wxUSE_STREAMS
1140     return false;
1141 #endif // wxUSE_STREAMS
1142 }
1143
1144
1145
1146 bool wxImage::SaveFile( const wxString& filename ) const
1147 {
1148     wxString ext = filename.AfterLast('.').Lower();
1149
1150     wxImageHandler * pHandler = FindHandler(ext, -1);
1151     if (pHandler)
1152     {
1153         SaveFile(filename, pHandler->GetType());
1154         return true;
1155     }
1156
1157     wxLogError(_("Can't save image to file '%s': unknown extension."), filename.c_str());
1158
1159     return false;
1160 }
1161
1162 bool wxImage::SaveFile( const wxString& filename, int type ) const
1163 {
1164 #if wxUSE_STREAMS
1165     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
1166
1167     wxFileOutputStream stream(filename);
1168
1169     if ( stream.IsOk() )
1170     {
1171         wxBufferedOutputStream bstream( stream );
1172         return SaveFile(bstream, type);
1173     }
1174 #endif // wxUSE_STREAMS
1175
1176     return false;
1177 }
1178
1179 bool wxImage::SaveFile( const wxString& filename, const wxString& mimetype ) const
1180 {
1181 #if wxUSE_STREAMS
1182     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
1183
1184     wxFileOutputStream stream(filename);
1185
1186     if ( stream.IsOk() )
1187     {
1188         wxBufferedOutputStream bstream( stream );
1189         return SaveFile(bstream, mimetype);
1190     }
1191 #endif // wxUSE_STREAMS
1192
1193     return false;
1194 }
1195
1196 bool wxImage::CanRead( const wxString &name )
1197 {
1198 #if wxUSE_STREAMS
1199   wxFileInputStream stream(name);
1200   return CanRead(stream);
1201 #else
1202   return false;
1203 #endif
1204 }
1205
1206 int wxImage::GetImageCount( const wxString &name, long type )
1207 {
1208 #if wxUSE_STREAMS
1209   wxFileInputStream stream(name);
1210   if (stream.Ok())
1211       return GetImageCount(stream, type);
1212 #endif
1213
1214   return 0;
1215 }
1216
1217 #if wxUSE_STREAMS
1218
1219 bool wxImage::CanRead( wxInputStream &stream )
1220 {
1221     const wxList& list = GetHandlers();
1222
1223     for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
1224     {
1225         wxImageHandler *handler=(wxImageHandler*)node->GetData();
1226         if (handler->CanRead( stream ))
1227             return true;
1228     }
1229
1230     return false;
1231 }
1232
1233 int wxImage::GetImageCount( wxInputStream &stream, long type )
1234 {
1235     wxImageHandler *handler;
1236
1237     if ( type == wxBITMAP_TYPE_ANY )
1238     {
1239         wxList &list=GetHandlers();
1240
1241         for (wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext())
1242         {
1243              handler=(wxImageHandler*)node->GetData();
1244              if ( handler->CanRead(stream) )
1245                  return handler->GetImageCount(stream);
1246
1247         }
1248
1249         wxLogWarning(_("No handler found for image type."));
1250         return 0;
1251     }
1252
1253     handler = FindHandler(type);
1254
1255     if ( !handler )
1256     {
1257         wxLogWarning(_("No image handler for type %d defined."), type);
1258         return false;
1259     }
1260
1261     if ( handler->CanRead(stream) )
1262     {
1263         return handler->GetImageCount(stream);
1264     }
1265     else
1266     {
1267         wxLogError(_("Image file is not of type %d."), type);
1268         return 0;
1269     }
1270 }
1271
1272 bool wxImage::LoadFile( wxInputStream& stream, long type, int index )
1273 {
1274     UnRef();
1275
1276     m_refData = new wxImageRefData;
1277
1278     wxImageHandler *handler;
1279
1280     if ( type == wxBITMAP_TYPE_ANY )
1281     {
1282         wxList &list=GetHandlers();
1283
1284         for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
1285         {
1286              handler=(wxImageHandler*)node->GetData();
1287              if ( handler->CanRead(stream) )
1288                  return handler->LoadFile(this, stream, true/*verbose*/, index);
1289
1290         }
1291
1292         wxLogWarning( _("No handler found for image type.") );
1293         return false;
1294     }
1295
1296     handler = FindHandler(type);
1297
1298     if (handler == 0)
1299     {
1300         wxLogWarning( _("No image handler for type %d defined."), type );
1301
1302         return false;
1303     }
1304
1305     return handler->LoadFile(this, stream, true/*verbose*/, index);
1306 }
1307
1308 bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int index )
1309 {
1310     UnRef();
1311
1312     m_refData = new wxImageRefData;
1313
1314     wxImageHandler *handler = FindHandlerMime(mimetype);
1315
1316     if (handler == 0)
1317     {
1318         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1319
1320         return false;
1321     }
1322
1323     return handler->LoadFile( this, stream, true/*verbose*/, index );
1324 }
1325
1326 bool wxImage::SaveFile( wxOutputStream& stream, int type ) const
1327 {
1328     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1329
1330     wxImageHandler *handler = FindHandler(type);
1331
1332     if (handler == 0)
1333     {
1334         wxLogWarning( _("No image handler for type %d defined."), type );
1335
1336         return false;
1337     }
1338
1339     return handler->SaveFile( (wxImage*)this, stream );
1340 }
1341
1342 bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype ) const
1343 {
1344     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1345
1346     wxImageHandler *handler = FindHandlerMime(mimetype);
1347
1348     if (handler == 0)
1349     {
1350         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1351
1352         return false;
1353     }
1354
1355     return handler->SaveFile( (wxImage*)this, stream );
1356 }
1357 #endif // wxUSE_STREAMS
1358
1359 void wxImage::AddHandler( wxImageHandler *handler )
1360 {
1361     // Check for an existing handler of the type being added.
1362     if (FindHandler( handler->GetType() ) == 0)
1363     {
1364         sm_handlers.Append( handler );
1365     }
1366     else
1367     {
1368         // This is not documented behaviour, merely the simplest 'fix'
1369         // for preventing duplicate additions.  If someone ever has
1370         // a good reason to add and remove duplicate handlers (and they
1371         // may) we should probably refcount the duplicates.
1372         //   also an issue in InsertHandler below.
1373
1374         wxLogDebug( _T("Adding duplicate image handler for '%s'"),
1375                     handler->GetName().c_str() );
1376         delete handler;
1377     }
1378 }
1379
1380 void wxImage::InsertHandler( wxImageHandler *handler )
1381 {
1382     // Check for an existing handler of the type being added.
1383     if (FindHandler( handler->GetType() ) == 0)
1384     {
1385         sm_handlers.Insert( handler );
1386     }
1387     else
1388     {
1389         // see AddHandler for additional comments.
1390         wxLogDebug( _T("Inserting duplicate image handler for '%s'"),
1391                     handler->GetName().c_str() );
1392         delete handler;
1393     }
1394 }
1395
1396 bool wxImage::RemoveHandler( const wxString& name )
1397 {
1398     wxImageHandler *handler = FindHandler(name);
1399     if (handler)
1400     {
1401         sm_handlers.DeleteObject(handler);
1402         delete handler;
1403         return true;
1404     }
1405     else
1406         return false;
1407 }
1408
1409 wxImageHandler *wxImage::FindHandler( const wxString& name )
1410 {
1411     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1412     while (node)
1413     {
1414         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1415         if (handler->GetName().Cmp(name) == 0) return handler;
1416
1417         node = node->GetNext();
1418     }
1419     return 0;
1420 }
1421
1422 wxImageHandler *wxImage::FindHandler( const wxString& extension, long bitmapType )
1423 {
1424     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1425     while (node)
1426     {
1427         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1428         if ( (handler->GetExtension().Cmp(extension) == 0) &&
1429             (bitmapType == -1 || handler->GetType() == bitmapType) )
1430             return handler;
1431         node = node->GetNext();
1432     }
1433     return 0;
1434 }
1435
1436 wxImageHandler *wxImage::FindHandler( long bitmapType )
1437 {
1438     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1439     while (node)
1440     {
1441         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1442         if (handler->GetType() == bitmapType) return handler;
1443         node = node->GetNext();
1444     }
1445     return 0;
1446 }
1447
1448 wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype )
1449 {
1450     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1451     while (node)
1452     {
1453         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1454         if (handler->GetMimeType().IsSameAs(mimetype, false)) return handler;
1455         node = node->GetNext();
1456     }
1457     return 0;
1458 }
1459
1460 void wxImage::InitStandardHandlers()
1461 {
1462 #if wxUSE_STREAMS
1463     AddHandler(new wxBMPHandler);
1464 #endif // wxUSE_STREAMS
1465 }
1466
1467 void wxImage::CleanUpHandlers()
1468 {
1469     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1470     while (node)
1471     {
1472         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1473         wxList::compatibility_iterator next = node->GetNext();
1474         delete handler;
1475         node = next;
1476     }
1477
1478     sm_handlers.Clear();
1479 }
1480
1481 wxString wxImage::GetImageExtWildcard()
1482 {
1483     wxString fmts;
1484
1485     wxList& Handlers = wxImage::GetHandlers();
1486     wxList::compatibility_iterator Node = Handlers.GetFirst();
1487     while ( Node )
1488     {
1489         wxImageHandler* Handler = (wxImageHandler*)Node->GetData();
1490         fmts += wxT("*.") + Handler->GetExtension();
1491         Node = Node->GetNext();
1492         if ( Node ) fmts += wxT(";");
1493     }
1494
1495     return wxT("(") + fmts + wxT(")|") + fmts;
1496 }
1497
1498 //-----------------------------------------------------------------------------
1499 // wxImageHandler
1500 //-----------------------------------------------------------------------------
1501
1502 IMPLEMENT_ABSTRACT_CLASS(wxImageHandler,wxObject)
1503
1504 #if wxUSE_STREAMS
1505 bool wxImageHandler::LoadFile( wxImage *WXUNUSED(image), wxInputStream& WXUNUSED(stream), bool WXUNUSED(verbose), int WXUNUSED(index) )
1506 {
1507     return false;
1508 }
1509
1510 bool wxImageHandler::SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream), bool WXUNUSED(verbose) )
1511 {
1512     return false;
1513 }
1514
1515 int wxImageHandler::GetImageCount( wxInputStream& WXUNUSED(stream) )
1516 {
1517     return 1;
1518 }
1519
1520 bool wxImageHandler::CanRead( const wxString& name )
1521 {
1522     if (wxFileExists(name))
1523     {
1524         wxFileInputStream stream(name);
1525         return CanRead(stream);
1526     }
1527
1528     wxLogError( _("Can't check image format of file '%s': file does not exist."), name.c_str() );
1529
1530     return false;
1531 }
1532
1533 bool wxImageHandler::CallDoCanRead(wxInputStream& stream)
1534 {
1535     wxFileOffset posOld = stream.TellI();
1536     if ( posOld == wxInvalidOffset )
1537     {
1538         // can't test unseekable stream
1539         return false;
1540     }
1541
1542     bool ok = DoCanRead(stream);
1543
1544     // restore the old position to be able to test other formats and so on
1545     if ( stream.SeekI(posOld) == wxInvalidOffset )
1546     {
1547         wxLogDebug(_T("Failed to rewind the stream in wxImageHandler!"));
1548
1549         // reading would fail anyhow as we're not at the right position
1550         return false;
1551     }
1552
1553     return ok;
1554 }
1555
1556 #endif // wxUSE_STREAMS
1557
1558 // ----------------------------------------------------------------------------
1559 // image histogram stuff
1560 // ----------------------------------------------------------------------------
1561
1562 bool
1563 wxImageHistogram::FindFirstUnusedColour(unsigned char *r,
1564                                         unsigned char *g,
1565                                         unsigned char *b,
1566                                         unsigned char r2,
1567                                         unsigned char b2,
1568                                         unsigned char g2) const
1569 {
1570     unsigned long key = MakeKey(r2, g2, b2);
1571
1572     while ( find(key) != end() )
1573     {
1574         // color already used
1575         r2++;
1576         if ( r2 >= 255 )
1577         {
1578             r2 = 0;
1579             g2++;
1580             if ( g2 >= 255 )
1581             {
1582                 g2 = 0;
1583                 b2++;
1584                 if ( b2 >= 255 )
1585                 {
1586                     wxLogError(_("No unused colour in image.") );
1587                     return false;
1588                 }
1589             }
1590         }
1591
1592         key = MakeKey(r2, g2, b2);
1593     }
1594
1595     if ( r )
1596         *r = r2;
1597     if ( g )
1598         *g = g2;
1599     if ( b )
1600         *b = b2;
1601
1602     return true;
1603 }
1604
1605 bool
1606 wxImage::FindFirstUnusedColour(unsigned char *r,
1607                                unsigned char *g,
1608                                unsigned char *b,
1609                                unsigned char r2,
1610                                unsigned char b2,
1611                                unsigned char g2) const
1612 {
1613     wxImageHistogram histogram;
1614
1615     ComputeHistogram(histogram);
1616
1617     return histogram.FindFirstUnusedColour(r, g, b, r2, g2, b2);
1618 }
1619
1620
1621
1622 // GRG, Dic/99
1623 // Counts and returns the number of different colours. Optionally stops
1624 // when it exceeds 'stopafter' different colours. This is useful, for
1625 // example, to see if the image can be saved as 8-bit (256 colour or
1626 // less, in this case it would be invoked as CountColours(256)). Default
1627 // value for stopafter is -1 (don't care).
1628 //
1629 unsigned long wxImage::CountColours( unsigned long stopafter ) const
1630 {
1631     wxHashTable h;
1632     wxObject dummy;
1633     unsigned char r, g, b;
1634     unsigned char *p;
1635     unsigned long size, nentries, key;
1636
1637     p = GetData();
1638     size = GetWidth() * GetHeight();
1639     nentries = 0;
1640
1641     for (unsigned long j = 0; (j < size) && (nentries <= stopafter) ; j++)
1642     {
1643         r = *(p++);
1644         g = *(p++);
1645         b = *(p++);
1646         key = wxImageHistogram::MakeKey(r, g, b);
1647
1648         if (h.Get(key) == NULL)
1649         {
1650             h.Put(key, &dummy);
1651             nentries++;
1652         }
1653     }
1654
1655     return nentries;
1656 }
1657
1658
1659 unsigned long wxImage::ComputeHistogram( wxImageHistogram &h ) const
1660 {
1661     unsigned char *p = GetData();
1662     unsigned long nentries = 0;
1663
1664     h.clear();
1665
1666     const unsigned long size = GetWidth() * GetHeight();
1667
1668     unsigned char r, g, b;
1669     for ( unsigned long n = 0; n < size; n++ )
1670     {
1671         r = *p++;
1672         g = *p++;
1673         b = *p++;
1674
1675         wxImageHistogramEntry& entry = h[wxImageHistogram::MakeKey(r, g, b)];
1676
1677         if ( entry.value++ == 0 )
1678             entry.index = nentries++;
1679     }
1680
1681     return nentries;
1682 }
1683
1684 /*
1685  * Rotation code by Carlos Moreno
1686  */
1687
1688 // GRG: I've removed wxRotationPoint - we already have wxRealPoint which
1689 //      does exactly the same thing. And I also got rid of wxRotationPixel
1690 //      bacause of potential problems in architectures where alignment
1691 //      is an issue, so I had to rewrite parts of the code.
1692
1693 static const double gs_Epsilon = 1e-10;
1694
1695 static inline int wxCint (double x)
1696 {
1697     return (x > 0) ? (int) (x + 0.5) : (int) (x - 0.5);
1698 }
1699
1700
1701 // Auxiliary function to rotate a point (x,y) with respect to point p0
1702 // make it inline and use a straight return to facilitate optimization
1703 // also, the function receives the sine and cosine of the angle to avoid
1704 // repeating the time-consuming calls to these functions -- sin/cos can
1705 // be computed and stored in the calling function.
1706
1707 inline wxRealPoint rotated_point (const wxRealPoint & p, double cos_angle, double sin_angle, const wxRealPoint & p0)
1708 {
1709     return wxRealPoint (p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle,
1710                         p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle);
1711 }
1712
1713 inline wxRealPoint rotated_point (double x, double y, double cos_angle, double sin_angle, const wxRealPoint & p0)
1714 {
1715     return rotated_point (wxRealPoint(x,y), cos_angle, sin_angle, p0);
1716 }
1717
1718 wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool interpolating, wxPoint * offset_after_rotation) const
1719 {
1720     int i;
1721     angle = -angle;     // screen coordinates are a mirror image of "real" coordinates
1722
1723     bool has_alpha = HasAlpha();
1724
1725     // Create pointer-based array to accelerate access to wxImage's data
1726     unsigned char ** data = new unsigned char * [GetHeight()];
1727     data[0] = GetData();
1728     for (i = 1; i < GetHeight(); i++)
1729         data[i] = data[i - 1] + (3 * GetWidth());
1730
1731     // Same for alpha channel
1732     unsigned char ** alpha = NULL;
1733     if (has_alpha)
1734     {
1735         alpha = new unsigned char * [GetHeight()];
1736         alpha[0] = GetAlpha();
1737         for (i = 1; i < GetHeight(); i++)
1738             alpha[i] = alpha[i - 1] + GetWidth();
1739     }
1740
1741     // precompute coefficients for rotation formula
1742     // (sine and cosine of the angle)
1743     const double cos_angle = cos(angle);
1744     const double sin_angle = sin(angle);
1745
1746     // Create new Image to store the result
1747     // First, find rectangle that covers the rotated image;  to do that,
1748     // rotate the four corners
1749
1750     const wxRealPoint p0(centre_of_rotation.x, centre_of_rotation.y);
1751
1752     wxRealPoint p1 = rotated_point (0, 0, cos_angle, sin_angle, p0);
1753     wxRealPoint p2 = rotated_point (0, GetHeight(), cos_angle, sin_angle, p0);
1754     wxRealPoint p3 = rotated_point (GetWidth(), 0, cos_angle, sin_angle, p0);
1755     wxRealPoint p4 = rotated_point (GetWidth(), GetHeight(), cos_angle, sin_angle, p0);
1756
1757     int x1 = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x)));
1758     int y1 = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y)));
1759     int x2 = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x)));
1760     int y2 = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y)));
1761
1762     // Create rotated image
1763     wxImage rotated (x2 - x1 + 1, y2 - y1 + 1, false);
1764     // With alpha channel
1765     if (has_alpha)
1766         rotated.SetAlpha();
1767
1768     if (offset_after_rotation != NULL)
1769     {
1770         *offset_after_rotation = wxPoint (x1, y1);
1771     }
1772
1773     // GRG: The rotated (destination) image is always accessed
1774     //      sequentially, so there is no need for a pointer-based
1775     //      array here (and in fact it would be slower).
1776     //
1777     unsigned char * dst = rotated.GetData();
1778
1779     unsigned char * alpha_dst = NULL;
1780     if (has_alpha)
1781         alpha_dst = rotated.GetAlpha();
1782
1783     // GRG: if the original image has a mask, use its RGB values
1784     //      as the blank pixel, else, fall back to default (black).
1785     //
1786     unsigned char blank_r = 0;
1787     unsigned char blank_g = 0;
1788     unsigned char blank_b = 0;
1789
1790     if (HasMask())
1791     {
1792         blank_r = GetMaskRed();
1793         blank_g = GetMaskGreen();
1794         blank_b = GetMaskBlue();
1795         rotated.SetMaskColour( blank_r, blank_g, blank_b );
1796     }
1797
1798     // Now, for each point of the rotated image, find where it came from, by
1799     // performing an inverse rotation (a rotation of -angle) and getting the
1800     // pixel at those coordinates
1801
1802     // GRG: I've taken the (interpolating) test out of the loops, so that
1803     //      it is done only once, instead of repeating it for each pixel.
1804
1805     int x;
1806     if (interpolating)
1807     {
1808         for (int y = 0; y < rotated.GetHeight(); y++)
1809         {
1810             for (x = 0; x < rotated.GetWidth(); x++)
1811             {
1812                 wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
1813
1814                 if (-0.25 < src.x && src.x < GetWidth() - 0.75 &&
1815                     -0.25 < src.y && src.y < GetHeight() - 0.75)
1816                 {
1817                     // interpolate using the 4 enclosing grid-points.  Those
1818                     // points can be obtained using floor and ceiling of the
1819                     // exact coordinates of the point
1820                         // C.M. 2000-02-17:  when the point is near the border, special care is required.
1821
1822                     int x1, y1, x2, y2;
1823
1824                     if (0 < src.x && src.x < GetWidth() - 1)
1825                     {
1826                         x1 = wxCint(floor(src.x));
1827                         x2 = wxCint(ceil(src.x));
1828                     }
1829                     else    // else means that x is near one of the borders (0 or width-1)
1830                     {
1831                         x1 = x2 = wxCint (src.x);
1832                     }
1833
1834                     if (0 < src.y && src.y < GetHeight() - 1)
1835                     {
1836                         y1 = wxCint(floor(src.y));
1837                         y2 = wxCint(ceil(src.y));
1838                     }
1839                     else
1840                     {
1841                         y1 = y2 = wxCint (src.y);
1842                     }
1843
1844                     // get four points and the distances (square of the distance,
1845                     // for efficiency reasons) for the interpolation formula
1846
1847                     // GRG: Do not calculate the points until they are
1848                     //      really needed -- this way we can calculate
1849                     //      just one, instead of four, if d1, d2, d3
1850                     //      or d4 are < gs_Epsilon
1851
1852                     const double d1 = (src.x - x1) * (src.x - x1) + (src.y - y1) * (src.y - y1);
1853                     const double d2 = (src.x - x2) * (src.x - x2) + (src.y - y1) * (src.y - y1);
1854                     const double d3 = (src.x - x2) * (src.x - x2) + (src.y - y2) * (src.y - y2);
1855                     const double d4 = (src.x - x1) * (src.x - x1) + (src.y - y2) * (src.y - y2);
1856
1857                     // Now interpolate as a weighted average of the four surrounding
1858                     // points, where the weights are the distances to each of those points
1859
1860                     // If the point is exactly at one point of the grid of the source
1861                     // image, then don't interpolate -- just assign the pixel
1862
1863                     if (d1 < gs_Epsilon)        // d1,d2,d3,d4 are positive -- no need for abs()
1864                     {
1865                         unsigned char *p = data[y1] + (3 * x1);
1866                         *(dst++) = *(p++);
1867                         *(dst++) = *(p++);
1868                         *(dst++) = *p;
1869
1870                         if (has_alpha)
1871                         {
1872                             unsigned char *p = alpha[y1] + x1;
1873                             *(alpha_dst++) = *p;
1874                         }
1875                     }
1876                     else if (d2 < gs_Epsilon)
1877                     {
1878                         unsigned char *p = data[y1] + (3 * x2);
1879                         *(dst++) = *(p++);
1880                         *(dst++) = *(p++);
1881                         *(dst++) = *p;
1882
1883                         if (has_alpha)
1884                         {
1885                             unsigned char *p = alpha[y1] + x2;
1886                             *(alpha_dst++) = *p;
1887                         }
1888                     }
1889                     else if (d3 < gs_Epsilon)
1890                     {
1891                         unsigned char *p = data[y2] + (3 * x2);
1892                         *(dst++) = *(p++);
1893                         *(dst++) = *(p++);
1894                         *(dst++) = *p;
1895
1896                         if (has_alpha)
1897                         {
1898                             unsigned char *p = alpha[y2] + x2;
1899                             *(alpha_dst++) = *p;
1900                         }
1901                     }
1902                     else if (d4 < gs_Epsilon)
1903                     {
1904                         unsigned char *p = data[y2] + (3 * x1);
1905                         *(dst++) = *(p++);
1906                         *(dst++) = *(p++);
1907                         *(dst++) = *p;
1908
1909                         if (has_alpha)
1910                         {
1911                             unsigned char *p = alpha[y2] + x1;
1912                             *(alpha_dst++) = *p;
1913                         }
1914                     }
1915                     else
1916                     {
1917                         // weights for the weighted average are proportional to the inverse of the distance
1918                         unsigned char *v1 = data[y1] + (3 * x1);
1919                         unsigned char *v2 = data[y1] + (3 * x2);
1920                         unsigned char *v3 = data[y2] + (3 * x2);
1921                         unsigned char *v4 = data[y2] + (3 * x1);
1922
1923                         const double w1 = 1/d1, w2 = 1/d2, w3 = 1/d3, w4 = 1/d4;
1924
1925                         // GRG: Unrolled.
1926
1927                         *(dst++) = (unsigned char)
1928                             ( (w1 * *(v1++) + w2 * *(v2++) +
1929                                w3 * *(v3++) + w4 * *(v4++)) /
1930                               (w1 + w2 + w3 + w4) );
1931                         *(dst++) = (unsigned char)
1932                             ( (w1 * *(v1++) + w2 * *(v2++) +
1933                                w3 * *(v3++) + w4 * *(v4++)) /
1934                               (w1 + w2 + w3 + w4) );
1935                         *(dst++) = (unsigned char)
1936                             ( (w1 * *v1 + w2 * *v2 +
1937                                w3 * *v3 + w4 * *v4) /
1938                               (w1 + w2 + w3 + w4) );
1939
1940                         if (has_alpha)
1941                         {
1942                             unsigned char *v1 = alpha[y1] + (x1);
1943                             unsigned char *v2 = alpha[y1] + (x2);
1944                             unsigned char *v3 = alpha[y2] + (x2);
1945                             unsigned char *v4 = alpha[y2] + (x1);
1946
1947                             *(alpha_dst++) = (unsigned char)
1948                                 ( (w1 * *v1 + w2 * *v2 +
1949                                    w3 * *v3 + w4 * *v4) /
1950                                   (w1 + w2 + w3 + w4) );
1951                         }
1952                     }
1953                 }
1954                 else
1955                 {
1956                     *(dst++) = blank_r;
1957                     *(dst++) = blank_g;
1958                     *(dst++) = blank_b;
1959
1960                     if (has_alpha)
1961                         *(alpha_dst++) = 0;
1962                 }
1963             }
1964         }
1965     }
1966     else    // not interpolating
1967     {
1968         for (int y = 0; y < rotated.GetHeight(); y++)
1969         {
1970             for (x = 0; x < rotated.GetWidth(); x++)
1971             {
1972                 wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
1973
1974                 const int xs = wxCint (src.x);      // wxCint rounds to the
1975                 const int ys = wxCint (src.y);      // closest integer
1976
1977                 if (0 <= xs && xs < GetWidth() &&
1978                     0 <= ys && ys < GetHeight())
1979                 {
1980                     unsigned char *p = data[ys] + (3 * xs);
1981                     *(dst++) = *(p++);
1982                     *(dst++) = *(p++);
1983                     *(dst++) = *p;
1984
1985                     if (has_alpha)
1986                     {
1987                         unsigned char *p = alpha[ys] + (xs);
1988                         *(alpha_dst++) = *p;
1989                     }
1990                 }
1991                 else
1992                 {
1993                     *(dst++) = blank_r;
1994                     *(dst++) = blank_g;
1995                     *(dst++) = blank_b;
1996
1997                     if (has_alpha)
1998                         *(alpha_dst++) = 255;
1999                 }
2000             }
2001         }
2002     }
2003
2004     delete [] data;
2005
2006     if (has_alpha)
2007         delete [] alpha;
2008
2009     return rotated;
2010 }
2011
2012
2013
2014
2015
2016 // A module to allow wxImage initialization/cleanup
2017 // without calling these functions from app.cpp or from
2018 // the user's application.
2019
2020 class wxImageModule: public wxModule
2021 {
2022 DECLARE_DYNAMIC_CLASS(wxImageModule)
2023 public:
2024     wxImageModule() {}
2025     bool OnInit() { wxImage::InitStandardHandlers(); return true; };
2026     void OnExit() { wxImage::CleanUpHandlers(); };
2027 };
2028
2029 IMPLEMENT_DYNAMIC_CLASS(wxImageModule, wxModule)
2030
2031
2032 #endif // wxUSE_IMAGE