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