src/common/image.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        image.cpp
   3 // Purpose:     wxImage
   4 // Author:      Robert Roebling
   5 // RCS-ID:      $Id$
   6 // Copyright:   (c) Robert Roebling
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  11 #pragma implementation "image.h"
  12 #endif
  13
  14 // For compilers that support precompilation, includes "wx.h".
  15 #include "wx/wxprec.h"
  16
  17 #ifdef __BORLANDC__
  18     #pragma hdrstop
  19 #endif
  20
  21 #include "wx/defs.h"
  22
  23 #if wxUSE_IMAGE
  24
  25 #include "wx/image.h"
  26 #include "wx/bitmap.h"
  27 #include "wx/debug.h"
  28 #include "wx/log.h"
  29 #include "wx/app.h"
  30 #include "wx/filefn.h"
  31 #include "wx/wfstream.h"
  32 #include "wx/intl.h"
  33 #include "wx/module.h"
  34 #include "wx/hash.h"
  35 #include "wx/utils.h"
  36
  37 // For memcpy
  38 #include <string.h>
  39 #include <math.h>
  40
  41 #ifdef __SALFORDC__
  42     #undef FAR
  43 #endif
  44
  45
  46 //-----------------------------------------------------------------------------
  47 // wxImage
  48 //-----------------------------------------------------------------------------
  49
  50 class wxImageRefData: public wxObjectRefData
  51 {
  52 public:
  53     wxImageRefData();
  54     virtual ~wxImageRefData();
  55
  56     int             m_width;
  57     int             m_height;
  58     unsigned char  *m_data;
  59
  60     bool            m_hasMask;
  61     unsigned char   m_maskRed,m_maskGreen,m_maskBlue;
  62
  63     // alpha channel data, may be NULL for the formats without alpha support
  64     unsigned char  *m_alpha;
  65
  66     bool            m_ok;
  67     bool            m_static;
  68
  69 #if wxUSE_PALETTE
  70     wxPalette       m_palette;
  71 #endif // wxUSE_PALETTE
  72
  73     wxArrayString   m_optionNames;
  74     wxArrayString   m_optionValues;
  75
  76     DECLARE_NO_COPY_CLASS(wxImageRefData)
  77 };
  78
  79 wxImageRefData::wxImageRefData()
  80 {
  81     m_width = 0;
  82     m_height = 0;
  83     m_data =
  84     m_alpha = (unsigned char *) NULL;
  85
  86     m_maskRed = 0;
  87     m_maskGreen = 0;
  88     m_maskBlue = 0;
  89     m_hasMask = false;
  90
  91     m_ok = false;
  92     m_static = false;
  93 }
  94
  95 wxImageRefData::~wxImageRefData()
  96 {
  97     if ( !m_static )
  98         free( m_data );
  99
 100     free(m_alpha);
 101 }
 102
 103 wxList wxImage::sm_handlers;
 104
 105 wxImage wxNullImage;
 106
 107 //-----------------------------------------------------------------------------
 108
 109 #define M_IMGDATA ((wxImageRefData *)m_refData)
 110
 111 IMPLEMENT_DYNAMIC_CLASS(wxImage, wxObject)
 112
 113 wxImage::wxImage( int width, int height, bool clear )
 114 {
 115     Create( width, height, clear );
 116 }
 117
 118 wxImage::wxImage( int width, int height, unsigned char* data, bool static_data )
 119 {
 120     Create( width, height, data, static_data );
 121 }
 122
 123 wxImage::wxImage( const wxString& name, long type, int index )
 124 {
 125     LoadFile( name, type, index );
 126 }
 127
 128 wxImage::wxImage( const wxString& name, const wxString& mimetype, int index )
 129 {
 130     LoadFile( name, mimetype, index );
 131 }
 132
 133 #if wxUSE_STREAMS
 134 wxImage::wxImage( wxInputStream& stream, long type, int index )
 135 {
 136     LoadFile( stream, type, index );
 137 }
 138
 139 wxImage::wxImage( wxInputStream& stream, const wxString& mimetype, int index )
 140 {
 141     LoadFile( stream, mimetype, index );
 142 }
 143 #endif // wxUSE_STREAMS
 144
 145 wxImage::wxImage( const wxImage& image )
 146     : wxObject()
 147 {
 148     Ref(image);
 149 }
 150
 151 wxImage::wxImage( const wxImage* image )
 152 {
 153     if (image) Ref(*image);
 154 }
 155
 156 bool wxImage::Create( int width, int height, bool clear )
 157 {
 158     UnRef();
 159
 160     m_refData = new wxImageRefData();
 161
 162     M_IMGDATA->m_data = (unsigned char *) malloc( width*height*3 );
 163     if (!M_IMGDATA->m_data)
 164     {
 165         UnRef();
 166         return false;
 167     }
 168
 169     if (clear)
 170         memset(M_IMGDATA->m_data, 0, width*height*3);
 171
 172     M_IMGDATA->m_width = width;
 173     M_IMGDATA->m_height = height;
 174     M_IMGDATA->m_ok = true;
 175
 176     return true;
 177 }
 178
 179 bool wxImage::Create( int width, int height, unsigned char* data, bool static_data )
 180 {
 181     UnRef();
 182
 183     wxCHECK_MSG( data, false, _T("NULL data in wxImage::Create") );
 184
 185     m_refData = new wxImageRefData();
 186
 187     M_IMGDATA->m_data = data;
 188     M_IMGDATA->m_width = width;
 189     M_IMGDATA->m_height = height;
 190     M_IMGDATA->m_ok = true;
 191     M_IMGDATA->m_static = static_data;
 192
 193     return true;
 194 }
 195
 196 void wxImage::Destroy()
 197 {
 198     UnRef();
 199 }
 200
 201 wxImage wxImage::Copy() const
 202 {
 203     wxImage image;
 204
 205     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 206
 207     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 208
 209     unsigned char *data = image.GetData();
 210
 211     wxCHECK_MSG( data, image, wxT("unable to create image") );
 212
 213     image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 214     image.SetMask( M_IMGDATA->m_hasMask );
 215
 216     memcpy( data, GetData(), M_IMGDATA->m_width*M_IMGDATA->m_height*3 );
 217
 218     // also copy the image options
 219     wxImageRefData *imgData = (wxImageRefData *)image.m_refData;
 220     imgData->m_optionNames = M_IMGDATA->m_optionNames;
 221     imgData->m_optionValues = M_IMGDATA->m_optionValues;
 222
 223     return image;
 224 }
 225
 226 wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const
 227 {
 228     if( xFactor == 1 && yFactor == 1 )
 229         return Copy() ;
 230
 231     wxImage image;
 232
 233     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 234
 235     // can't scale to/from 0 size
 236     wxCHECK_MSG( (xFactor > 0) && (yFactor > 0), image,
 237                  wxT("invalid new image size") );
 238
 239     long old_height = M_IMGDATA->m_height,
 240          old_width  = M_IMGDATA->m_width;
 241
 242     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 243                  wxT("invalid old image size") );
 244
 245     long width = old_width / xFactor ;
 246     long height = old_height / yFactor ;
 247
 248     image.Create( width, height, false );
 249
 250     char unsigned *data = image.GetData();
 251
 252     wxCHECK_MSG( data, image, wxT("unable to create image") );
 253
 254     bool hasMask = false ;
 255     unsigned char maskRed = 0;
 256     unsigned char maskGreen = 0;
 257     unsigned char maskBlue =0 ;
 258     if (M_IMGDATA->m_hasMask)
 259     {
 260         hasMask = true ;
 261         maskRed = M_IMGDATA->m_maskRed;
 262         maskGreen = M_IMGDATA->m_maskGreen;
 263         maskBlue =M_IMGDATA->m_maskBlue ;
 264
 265         image.SetMaskColour( M_IMGDATA->m_maskRed,
 266                              M_IMGDATA->m_maskGreen,
 267                              M_IMGDATA->m_maskBlue );
 268     }
 269     char unsigned *source_data = M_IMGDATA->m_data;
 270     char unsigned *target_data = data;
 271
 272     for (long y = 0; y < height; y++)
 273     {
 274         for (long x = 0; x < width; x++)
 275         {
 276             unsigned long avgRed = 0 ;
 277             unsigned long avgGreen = 0;
 278             unsigned long avgBlue = 0;
 279             unsigned long counter = 0 ;
 280             // determine average
 281             for ( int y1 = 0 ; y1 < yFactor ; ++y1 )
 282             {
 283                 long y_offset = (y * yFactor + y1) * old_width;
 284                 for ( int x1 = 0 ; x1 < xFactor ; ++x1 )
 285                 {
 286                     unsigned char *pixel = source_data + 3 * ( y_offset + x * xFactor + x1 ) ;
 287                     unsigned char red = pixel[0] ;
 288                     unsigned char green = pixel[1] ;
 289                     unsigned char blue = pixel[2] ;
 290                     if ( !hasMask || red != maskRed || green != maskGreen || blue != maskBlue )
 291                     {
 292                         avgRed += red ;
 293                         avgGreen += green ;
 294                         avgBlue += blue ;
 295                         counter++ ;
 296                     }
 297                 }
 298             }
 299             if ( counter == 0 )
 300             {
 301                 *(target_data++) = M_IMGDATA->m_maskRed ;
 302                 *(target_data++) = M_IMGDATA->m_maskGreen ;
 303                 *(target_data++) = M_IMGDATA->m_maskBlue ;
 304             }
 305             else
 306             {
 307                 *(target_data++) = (unsigned char)(avgRed / counter);
 308                 *(target_data++) = (unsigned char)(avgGreen / counter);
 309                 *(target_data++) = (unsigned char)(avgBlue / counter);
 310             }
 311         }
 312     }
 313
 314     // In case this is a cursor, make sure the hotspot is scalled accordingly:
 315     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
 316         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
 317                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X))/xFactor);
 318     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
 319         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
 320                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y))/yFactor);
 321
 322     return image;
 323 }
 324
 325 wxImage wxImage::Scale( int width, int height ) const
 326 {
 327     wxImage image;
 328
 329     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 330
 331     // can't scale to/from 0 size
 332     wxCHECK_MSG( (width > 0) && (height > 0), image,
 333                  wxT("invalid new image size") );
 334
 335     long old_height = M_IMGDATA->m_height,
 336          old_width  = M_IMGDATA->m_width;
 337     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 338                  wxT("invalid old image size") );
 339
 340     if ( old_width % width == 0 && old_width >= width &&
 341         old_height % height == 0 && old_height >= height )
 342     {
 343         return ShrinkBy( old_width / width , old_height / height ) ;
 344     }
 345     image.Create( width, height, false );
 346
 347     unsigned char *data = image.GetData();
 348
 349     wxCHECK_MSG( data, image, wxT("unable to create image") );
 350
 351     if (M_IMGDATA->m_hasMask)
 352     {
 353         image.SetMaskColour( M_IMGDATA->m_maskRed,
 354                              M_IMGDATA->m_maskGreen,
 355                              M_IMGDATA->m_maskBlue );
 356     }
 357
 358     unsigned char *source_data = M_IMGDATA->m_data;
 359     unsigned char *target_data = data;
 360
 361     long x_delta = (old_width<<16) / width;
 362     long y_delta = (old_height<<16) / height;
 363
 364     unsigned char* dest_pixel = target_data;
 365
 366     long y = 0;
 367     for ( long j = 0; j < height; j++ )
 368         {
 369         unsigned char* src_line = &source_data[(y>>16)*old_width*3];
 370
 371         long x = 0;
 372         for ( long i = 0; i < width; i++ )
 373         {
 374              unsigned char* src_pixel = &src_line[(x>>16)*3];
 375              dest_pixel[0] = src_pixel[0];
 376              dest_pixel[1] = src_pixel[1];
 377              dest_pixel[2] = src_pixel[2];
 378              dest_pixel += 3;
 379              x += x_delta;
 380         }
 381
 382         y += y_delta;
 383     }
 384
 385     // In case this is a cursor, make sure the hotspot is scalled accordingly:
 386     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
 387         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
 388                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X)*width)/old_width);
 389     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
 390         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
 391                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y)*height)/old_height);
 392
 393     return image;
 394 }
 395
 396 wxImage wxImage::Rotate90( bool clockwise ) const
 397 {
 398     wxImage image;
 399
 400     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 401
 402     image.Create( M_IMGDATA->m_height, M_IMGDATA->m_width, false );
 403
 404     unsigned char *data = image.GetData();
 405
 406     wxCHECK_MSG( data, image, wxT("unable to create image") );
 407
 408     if (M_IMGDATA->m_hasMask)
 409         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 410
 411     long height = M_IMGDATA->m_height;
 412     long width  = M_IMGDATA->m_width;
 413
 414     unsigned char *source_data = M_IMGDATA->m_data;
 415     unsigned char *target_data;
 416
 417     for (long j = 0; j < height; j++)
 418     {
 419         for (long i = 0; i < width; i++)
 420         {
 421             if (clockwise)
 422                 target_data = data + (((i+1)*height) - j - 1)*3;
 423             else
 424                 target_data = data + ((height*(width-1)) + j - (i*height))*3;
 425             memcpy( target_data, source_data, 3 );
 426             source_data += 3;
 427         }
 428     }
 429
 430     return image;
 431 }
 432
 433 wxImage wxImage::Mirror( bool horizontally ) const
 434 {
 435     wxImage image;
 436
 437     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 438
 439     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 440
 441     unsigned char *data = image.GetData();
 442
 443     wxCHECK_MSG( data, image, wxT("unable to create image") );
 444
 445     if (M_IMGDATA->m_hasMask)
 446         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 447
 448     long height = M_IMGDATA->m_height;
 449     long width  = M_IMGDATA->m_width;
 450
 451     unsigned char *source_data = M_IMGDATA->m_data;
 452     unsigned char *target_data;
 453
 454     if (horizontally)
 455     {
 456         for (long j = 0; j < height; j++)
 457         {
 458             data += width*3;
 459             target_data = data-3;
 460             for (long i = 0; i < width; i++)
 461             {
 462                 memcpy( target_data, source_data, 3 );
 463                 source_data += 3;
 464                 target_data -= 3;
 465             }
 466         }
 467     }
 468     else
 469     {
 470         for (long i = 0; i < height; i++)
 471         {
 472             target_data = data + 3*width*(height-1-i);
 473             memcpy( target_data, source_data, (size_t)3*width );
 474             source_data += 3*width;
 475         }
 476     }
 477
 478     return image;
 479 }
 480
 481 wxImage wxImage::GetSubImage( const wxRect &rect ) const
 482 {
 483     wxImage image;
 484
 485     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 486
 487     wxCHECK_MSG( (rect.GetLeft()>=0) && (rect.GetTop()>=0) && (rect.GetRight()<=GetWidth()) && (rect.GetBottom()<=GetHeight()),
 488                  image, wxT("invalid subimage size") );
 489
 490     int subwidth=rect.GetWidth();
 491     const int subheight=rect.GetHeight();
 492
 493     image.Create( subwidth, subheight, false );
 494
 495     unsigned char *subdata = image.GetData(), *data=GetData();
 496
 497     wxCHECK_MSG( subdata, image, wxT("unable to create image") );
 498
 499     if (M_IMGDATA->m_hasMask)
 500         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 501
 502     const int subleft=3*rect.GetLeft();
 503     const int width=3*GetWidth();
 504     subwidth*=3;
 505
 506     data+=rect.GetTop()*width+subleft;
 507
 508     for (long j = 0; j < subheight; ++j)
 509     {
 510         memcpy( subdata, data, subwidth);
 511         subdata+=subwidth;
 512         data+=width;
 513     }
 514
 515     return image;
 516 }
 517
 518 void wxImage::Paste( const wxImage &image, int x, int y )
 519 {
 520     wxCHECK_RET( Ok(), wxT("invalid image") );
 521     wxCHECK_RET( image.Ok(), wxT("invalid image") );
 522
 523     int xx = 0;
 524     int yy = 0;
 525     int width = image.GetWidth();
 526     int height = image.GetHeight();
 527
 528     if (x < 0)
 529     {
 530         xx = -x;
 531         width += x;
 532     }
 533     if (y < 0)
 534     {
 535         yy = -y;
 536         height += y;
 537     }
 538
 539     if ((x+xx)+width > M_IMGDATA->m_width)
 540         width = M_IMGDATA->m_width - (x+xx);
 541     if ((y+yy)+height > M_IMGDATA->m_height)
 542         height = M_IMGDATA->m_height - (y+yy);
 543
 544     if (width < 1) return;
 545     if (height < 1) return;
 546
 547     if ((!HasMask() && !image.HasMask()) ||
 548        ((HasMask() && image.HasMask() &&
 549          (GetMaskRed()==image.GetMaskRed()) &&
 550          (GetMaskGreen()==image.GetMaskGreen()) &&
 551          (GetMaskBlue()==image.GetMaskBlue()))))
 552     {
 553         width *= 3;
 554         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 555         int source_step = image.GetWidth()*3;
 556
 557         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 558         int target_step = M_IMGDATA->m_width*3;
 559         for (int j = 0; j < height; j++)
 560         {
 561             memcpy( target_data, source_data, width );
 562             source_data += source_step;
 563             target_data += target_step;
 564         }
 565         return;
 566     }
 567
 568     if (!HasMask() && image.HasMask())
 569     {
 570         unsigned char r = image.GetMaskRed();
 571         unsigned char g = image.GetMaskGreen();
 572         unsigned char b = image.GetMaskBlue();
 573
 574         width *= 3;
 575         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 576         int source_step = image.GetWidth()*3;
 577
 578         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 579         int target_step = M_IMGDATA->m_width*3;
 580
 581         for (int j = 0; j < height; j++)
 582         {
 583             for (int i = 0; i < width; i+=3)
 584             {
 585                 if ((source_data[i]   != r) &&
 586                     (source_data[i+1] != g) &&
 587                     (source_data[i+2] != b))
 588                 {
 589                     memcpy( target_data+i, source_data+i, 3 );
 590                 }
 591             }
 592             source_data += source_step;
 593             target_data += target_step;
 594         }
 595     }
 596 }
 597
 598 void wxImage::Replace( unsigned char r1, unsigned char g1, unsigned char b1,
 599                        unsigned char r2, unsigned char g2, unsigned char b2 )
 600 {
 601     wxCHECK_RET( Ok(), wxT("invalid image") );
 602
 603     unsigned char *data = GetData();
 604
 605     const int w = GetWidth();
 606     const int h = GetHeight();
 607
 608     for (int j = 0; j < h; j++)
 609         for (int i = 0; i < w; i++)
 610         {
 611             if ((data[0] == r1) && (data[1] == g1) && (data[2] == b1))
 612             {
 613                 data[0] = r2;
 614                 data[1] = g2;
 615                 data[2] = b2;
 616             }
 617             data += 3;
 618         }
 619 }
 620
 621 wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const
 622 {
 623     wxImage image;
 624
 625     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 626
 627     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 628
 629     unsigned char *data = image.GetData();
 630
 631     wxCHECK_MSG( data, image, wxT("unable to create image") );
 632
 633     if (M_IMGDATA->m_hasMask)
 634     {
 635         if (M_IMGDATA->m_maskRed == r && M_IMGDATA->m_maskGreen == g &&
 636                                          M_IMGDATA->m_maskBlue == b)
 637             image.SetMaskColour( 255, 255, 255 );
 638         else
 639             image.SetMaskColour( 0, 0, 0 );
 640     }
 641
 642     long size = M_IMGDATA->m_height * M_IMGDATA->m_width;
 643
 644     unsigned char *srcd = M_IMGDATA->m_data;
 645     unsigned char *tard = image.GetData();
 646
 647     for ( long i = 0; i < size; i++, srcd += 3, tard += 3 )
 648     {
 649         if (srcd[0] == r && srcd[1] == g && srcd[2] == b)
 650             tard[0] = tard[1] = tard[2] = 255;
 651         else
 652             tard[0] = tard[1] = tard[2] = 0;
 653     }
 654
 655     return image;
 656 }
 657
 658 void wxImage::SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b )
 659 {
 660     wxCHECK_RET( Ok(), wxT("invalid image") );
 661
 662     int w = M_IMGDATA->m_width;
 663     int h = M_IMGDATA->m_height;
 664
 665     wxCHECK_RET( (x>=0) && (y>=0) && (x<w) && (y<h), wxT("invalid image index") );
 666
 667     long pos = (y * w + x) * 3;
 668
 669     M_IMGDATA->m_data[ pos   ] = r;
 670     M_IMGDATA->m_data[ pos+1 ] = g;
 671     M_IMGDATA->m_data[ pos+2 ] = b;
 672 }
 673
 674 unsigned char wxImage::GetRed( int x, int y ) const
 675 {
 676     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 677
 678     int w = M_IMGDATA->m_width;
 679     int h = M_IMGDATA->m_height;
 680
 681     wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
 682
 683     long pos = (y * w + x) * 3;
 684
 685     return M_IMGDATA->m_data[pos];
 686 }
 687
 688 unsigned char wxImage::GetGreen( int x, int y ) const
 689 {
 690     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 691
 692     int w = M_IMGDATA->m_width;
 693     int h = M_IMGDATA->m_height;
 694
 695     wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
 696
 697     long pos = (y * w + x) * 3;
 698
 699     return M_IMGDATA->m_data[pos+1];
 700 }
 701
 702 unsigned char wxImage::GetBlue( int x, int y ) const
 703 {
 704     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 705
 706     int w = M_IMGDATA->m_width;
 707     int h = M_IMGDATA->m_height;
 708
 709     wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
 710
 711     long pos = (y * w + x) * 3;
 712
 713     return M_IMGDATA->m_data[pos+2];
 714 }
 715
 716 bool wxImage::Ok() const
 717 {
 718     // image of 0 width or height can't be considered ok - at least because it
 719     // causes crashes in ConvertToBitmap() if we don't catch it in time
 720     wxImageRefData *data = M_IMGDATA;
 721     return data && data->m_ok && data->m_width && data->m_height;
 722 }
 723
 724 unsigned char *wxImage::GetData() const
 725 {
 726     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
 727
 728     return M_IMGDATA->m_data;
 729 }
 730
 731 void wxImage::SetData( unsigned char *data )
 732 {
 733     wxCHECK_RET( Ok(), wxT("invalid image") );
 734
 735     wxImageRefData *newRefData = new wxImageRefData();
 736
 737     newRefData->m_width = M_IMGDATA->m_width;
 738     newRefData->m_height = M_IMGDATA->m_height;
 739     newRefData->m_data = data;
 740     newRefData->m_ok = true;
 741     newRefData->m_maskRed = M_IMGDATA->m_maskRed;
 742     newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
 743     newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
 744     newRefData->m_hasMask = M_IMGDATA->m_hasMask;
 745
 746     UnRef();
 747
 748     m_refData = newRefData;
 749 }
 750
 751 void wxImage::SetData( unsigned char *data, int new_width, int new_height )
 752 {
 753     wxImageRefData *newRefData = new wxImageRefData();
 754
 755     if (m_refData)
 756     {
 757         newRefData->m_width = new_width;
 758         newRefData->m_height = new_height;
 759         newRefData->m_data = data;
 760         newRefData->m_ok = true;
 761         newRefData->m_maskRed = M_IMGDATA->m_maskRed;
 762         newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
 763         newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
 764         newRefData->m_hasMask = M_IMGDATA->m_hasMask;
 765     }
 766     else
 767     {
 768         newRefData->m_width = new_width;
 769         newRefData->m_height = new_height;
 770         newRefData->m_data = data;
 771         newRefData->m_ok = true;
 772     }
 773
 774     UnRef();
 775
 776     m_refData = newRefData;
 777 }
 778
 779 // ----------------------------------------------------------------------------
 780 // alpha channel support
 781 // ----------------------------------------------------------------------------
 782
 783 void wxImage::SetAlpha(int x, int y, unsigned char alpha)
 784 {
 785     wxCHECK_RET( Ok() && HasAlpha(), wxT("invalid image or no alpha channel") );
 786
 787     int w = M_IMGDATA->m_width,
 788         h = M_IMGDATA->m_height;
 789
 790     wxCHECK_RET( x >=0 && y >= 0 && x < w && y < h, wxT("invalid image index") );
 791
 792     M_IMGDATA->m_alpha[y*w + x] = alpha;
 793 }
 794
 795 unsigned char wxImage::GetAlpha(int x, int y) const
 796 {
 797     wxCHECK_MSG( Ok() && HasAlpha(), 0, wxT("invalid image or no alpha channel") );
 798
 799     int w = M_IMGDATA->m_width,
 800         h = M_IMGDATA->m_height;
 801
 802     wxCHECK_MSG( x >=0 && y >= 0 && x < w && y < h, 0, wxT("invalid image index") );
 803
 804     return M_IMGDATA->m_alpha[y*w + x];
 805 }
 806
 807 void wxImage::SetAlpha( unsigned char *alpha )
 808 {
 809     wxCHECK_RET( Ok(), wxT("invalid image") );
 810
 811     if ( !alpha )
 812     {
 813         alpha = (unsigned char *)malloc(M_IMGDATA->m_width*M_IMGDATA->m_height);
 814     }
 815
 816     free(M_IMGDATA->m_alpha);
 817     M_IMGDATA->m_alpha = alpha;
 818 }
 819
 820 unsigned char *wxImage::GetAlpha() const
 821 {
 822     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
 823
 824     return M_IMGDATA->m_alpha;
 825 }
 826
 827 // ----------------------------------------------------------------------------
 828 // mask support
 829 // ----------------------------------------------------------------------------
 830
 831 void wxImage::SetMaskColour( unsigned char r, unsigned char g, unsigned char b )
 832 {
 833     wxCHECK_RET( Ok(), wxT("invalid image") );
 834
 835     M_IMGDATA->m_maskRed = r;
 836     M_IMGDATA->m_maskGreen = g;
 837     M_IMGDATA->m_maskBlue = b;
 838     M_IMGDATA->m_hasMask = true;
 839 }
 840
 841 unsigned char wxImage::GetMaskRed() const
 842 {
 843     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 844
 845     return M_IMGDATA->m_maskRed;
 846 }
 847
 848 unsigned char wxImage::GetMaskGreen() const
 849 {
 850     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 851
 852     return M_IMGDATA->m_maskGreen;
 853 }
 854
 855 unsigned char wxImage::GetMaskBlue() const
 856 {
 857     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 858
 859     return M_IMGDATA->m_maskBlue;
 860 }
 861
 862 void wxImage::SetMask( bool mask )
 863 {
 864     wxCHECK_RET( Ok(), wxT("invalid image") );
 865
 866     M_IMGDATA->m_hasMask = mask;
 867 }
 868
 869 bool wxImage::HasMask() const
 870 {
 871     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
 872
 873     return M_IMGDATA->m_hasMask;
 874 }
 875
 876 int wxImage::GetWidth() const
 877 {
 878     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 879
 880     return M_IMGDATA->m_width;
 881 }
 882
 883 int wxImage::GetHeight() const
 884 {
 885     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 886
 887     return M_IMGDATA->m_height;
 888 }
 889
 890 bool wxImage::SetMaskFromImage(const wxImage& mask,
 891                                unsigned char mr, unsigned char mg, unsigned char mb)
 892 {
 893     // check that the images are the same size
 894     if ( (M_IMGDATA->m_height != mask.GetHeight() ) || (M_IMGDATA->m_width != mask.GetWidth () ) )
 895     {
 896         wxLogError( _("Image and mask have different sizes.") );
 897         return false;
 898     }
 899
 900     // find unused colour
 901     unsigned char r,g,b ;
 902     if (!FindFirstUnusedColour(&r, &g, &b))
 903     {
 904         wxLogError( _("No unused colour in image being masked.") );
 905         return false ;
 906     }
 907
 908     unsigned char *imgdata = GetData();
 909     unsigned char *maskdata = mask.GetData();
 910
 911     const int w = GetWidth();
 912     const int h = GetHeight();
 913
 914     for (int j = 0; j < h; j++)
 915     {
 916         for (int i = 0; i < w; i++)
 917         {
 918             if ((maskdata[0] == mr) && (maskdata[1]  == mg) && (maskdata[2] == mb))
 919             {
 920                 imgdata[0] = r;
 921                 imgdata[1] = g;
 922                 imgdata[2] = b;
 923             }
 924             imgdata  += 3;
 925             maskdata += 3;
 926         }
 927     }
 928
 929     SetMaskColour(r, g, b);
 930     SetMask(true);
 931
 932     return true;
 933 }
 934
 935 bool wxImage::ConvertAlphaToMask(unsigned char threshold)
 936 {
 937     if (!HasAlpha())
 938         return true;
 939
 940     unsigned char mr, mg, mb;
 941     if (!FindFirstUnusedColour(&mr, &mg, &mb))
 942     {
 943         wxLogError( _("No unused colour in image being masked.") );
 944         return false;
 945     }
 946
 947     SetMask(true);
 948     SetMaskColour(mr, mg, mb);
 949
 950     unsigned char *imgdata = GetData();
 951     unsigned char *alphadata = GetAlpha();
 952
 953     int w = GetWidth();
 954     int h = GetHeight();
 955
 956     for (int y = 0; y < h; y++)
 957     {
 958         for (int x = 0; x < w; x++, imgdata += 3, alphadata++)
 959         {
 960             if (*alphadata < threshold)
 961             {
 962                 imgdata[0] = mr;
 963                 imgdata[1] = mg;
 964                 imgdata[2] = mb;
 965             }
 966         }
 967     }
 968
 969     free(M_IMGDATA->m_alpha);
 970     M_IMGDATA->m_alpha = NULL;
 971
 972     return true;
 973 }
 974
 975 #if wxUSE_PALETTE
 976
 977 // Palette functions
 978
 979 bool wxImage::HasPalette() const
 980 {
 981     if (!Ok())
 982         return false;
 983
 984     return M_IMGDATA->m_palette.Ok();
 985 }
 986
 987 const wxPalette& wxImage::GetPalette() const
 988 {
 989     wxCHECK_MSG( Ok(), wxNullPalette, wxT("invalid image") );
 990
 991     return M_IMGDATA->m_palette;
 992 }
 993
 994 void wxImage::SetPalette(const wxPalette& palette)
 995 {
 996     wxCHECK_RET( Ok(), wxT("invalid image") );
 997
 998     M_IMGDATA->m_palette = palette;
 999 }
1000
1001 #endif // wxUSE_PALETTE
1002
1003 // Option functions (arbitrary name/value mapping)
1004 void wxImage::SetOption(const wxString& name, const wxString& value)
1005 {
1006     wxCHECK_RET( Ok(), wxT("invalid image") );
1007
1008     int idx = M_IMGDATA->m_optionNames.Index(name, false);
1009     if (idx == wxNOT_FOUND)
1010     {
1011         M_IMGDATA->m_optionNames.Add(name);
1012         M_IMGDATA->m_optionValues.Add(value);
1013     }
1014     else
1015     {
1016         M_IMGDATA->m_optionNames[idx] = name;
1017         M_IMGDATA->m_optionValues[idx] = value;
1018     }
1019 }
1020
1021 void wxImage::SetOption(const wxString& name, int value)
1022 {
1023     wxString valStr;
1024     valStr.Printf(wxT("%d"), value);
1025     SetOption(name, valStr);
1026 }
1027
1028 wxString wxImage::GetOption(const wxString& name) const
1029 {
1030     wxCHECK_MSG( Ok(), wxEmptyString, wxT("invalid image") );
1031
1032     int idx = M_IMGDATA->m_optionNames.Index(name, false);
1033     if (idx == wxNOT_FOUND)
1034         return wxEmptyString;
1035     else
1036         return M_IMGDATA->m_optionValues[idx];
1037 }
1038
1039 int wxImage::GetOptionInt(const wxString& name) const
1040 {
1041     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1042
1043     return wxAtoi(GetOption(name));
1044 }
1045
1046 bool wxImage::HasOption(const wxString& name) const
1047 {
1048     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1049
1050     return (M_IMGDATA->m_optionNames.Index(name, false) != wxNOT_FOUND);
1051 }
1052
1053 bool wxImage::LoadFile( const wxString& filename, long type, int index )
1054 {
1055 #if wxUSE_STREAMS
1056     if (wxFileExists(filename))
1057     {
1058         wxFileInputStream stream(filename);
1059         wxBufferedInputStream bstream( stream );
1060         return LoadFile(bstream, type, index);
1061     }
1062     else
1063     {
1064         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
1065
1066         return false;
1067     }
1068 #else // !wxUSE_STREAMS
1069     return false;
1070 #endif // wxUSE_STREAMS
1071 }
1072
1073 bool wxImage::LoadFile( const wxString& filename, const wxString& mimetype, int index )
1074 {
1075 #if wxUSE_STREAMS
1076     if (wxFileExists(filename))
1077     {
1078         wxFileInputStream stream(filename);
1079         wxBufferedInputStream bstream( stream );
1080         return LoadFile(bstream, mimetype, index);
1081     }
1082     else
1083     {
1084         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
1085
1086         return false;
1087     }
1088 #else // !wxUSE_STREAMS
1089     return false;
1090 #endif // wxUSE_STREAMS
1091 }
1092
1093
1094
1095 bool wxImage::SaveFile( const wxString& filename ) const
1096 {
1097     wxString ext = filename.AfterLast('.').Lower();
1098
1099     wxImageHandler * pHandler = FindHandler(ext, -1);
1100     if (pHandler)
1101     {
1102         SaveFile(filename, pHandler->GetType());
1103         return true;
1104     }
1105
1106     wxLogError(_("Can't save image to file '%s': unknown extension."), filename.c_str());
1107
1108     return false;
1109 }
1110
1111 bool wxImage::SaveFile( const wxString& filename, int type ) const
1112 {
1113 #if wxUSE_STREAMS
1114     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
1115
1116     wxFileOutputStream stream(filename);
1117
1118     if ( stream.IsOk() )
1119     {
1120         wxBufferedOutputStream bstream( stream );
1121         return SaveFile(bstream, type);
1122     }
1123 #endif // wxUSE_STREAMS
1124
1125     return false;
1126 }
1127
1128 bool wxImage::SaveFile( const wxString& filename, const wxString& mimetype ) const
1129 {
1130 #if wxUSE_STREAMS
1131     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
1132
1133     wxFileOutputStream stream(filename);
1134
1135     if ( stream.IsOk() )
1136     {
1137         wxBufferedOutputStream bstream( stream );
1138         return SaveFile(bstream, mimetype);
1139     }
1140 #endif // wxUSE_STREAMS
1141
1142     return false;
1143 }
1144
1145 bool wxImage::CanRead( const wxString &name )
1146 {
1147 #if wxUSE_STREAMS
1148   wxFileInputStream stream(name);
1149   return CanRead(stream);
1150 #else
1151   return false;
1152 #endif
1153 }
1154
1155 int wxImage::GetImageCount( const wxString &name, long type )
1156 {
1157 #if wxUSE_STREAMS
1158   wxFileInputStream stream(name);
1159   if (stream.Ok())
1160       return GetImageCount(stream, type);
1161 #endif
1162
1163   return 0;
1164 }
1165
1166 #if wxUSE_STREAMS
1167
1168 bool wxImage::CanRead( wxInputStream &stream )
1169 {
1170     const wxList& list = GetHandlers();
1171
1172     for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
1173     {
1174         wxImageHandler *handler=(wxImageHandler*)node->GetData();
1175         if (handler->CanRead( stream ))
1176             return true;
1177     }
1178
1179     return false;
1180 }
1181
1182 int wxImage::GetImageCount( wxInputStream &stream, long type )
1183 {
1184     wxImageHandler *handler;
1185
1186     if ( type == wxBITMAP_TYPE_ANY )
1187     {
1188         wxList &list=GetHandlers();
1189
1190         for (wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext())
1191         {
1192              handler=(wxImageHandler*)node->GetData();
1193              if ( handler->CanRead(stream) )
1194                  return handler->GetImageCount(stream);
1195
1196         }
1197
1198         wxLogWarning(_("No handler found for image type."));
1199         return 0;
1200     }
1201
1202     handler = FindHandler(type);
1203
1204     if ( !handler )
1205     {
1206         wxLogWarning(_("No image handler for type %d defined."), type);
1207         return false;
1208     }
1209
1210     if ( handler->CanRead(stream) )
1211     {
1212         return handler->GetImageCount(stream);
1213     }
1214     else
1215     {
1216         wxLogError(_("Image file is not of type %d."), type);
1217         return 0;
1218     }
1219 }
1220
1221 bool wxImage::LoadFile( wxInputStream& stream, long type, int index )
1222 {
1223     UnRef();
1224
1225     m_refData = new wxImageRefData;
1226
1227     wxImageHandler *handler;
1228
1229     if ( type == wxBITMAP_TYPE_ANY )
1230     {
1231         wxList &list=GetHandlers();
1232
1233         for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
1234         {
1235              handler=(wxImageHandler*)node->GetData();
1236              if ( handler->CanRead(stream) )
1237                  return handler->LoadFile(this, stream, true/*verbose*/, index);
1238
1239         }
1240
1241         wxLogWarning( _("No handler found for image type.") );
1242         return false;
1243     }
1244
1245     handler = FindHandler(type);
1246
1247     if (handler == 0)
1248     {
1249         wxLogWarning( _("No image handler for type %d defined."), type );
1250
1251         return false;
1252     }
1253
1254     return handler->LoadFile(this, stream, true/*verbose*/, index);
1255 }
1256
1257 bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int index )
1258 {
1259     UnRef();
1260
1261     m_refData = new wxImageRefData;
1262
1263     wxImageHandler *handler = FindHandlerMime(mimetype);
1264
1265     if (handler == 0)
1266     {
1267         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1268
1269         return false;
1270     }
1271
1272     return handler->LoadFile( this, stream, true/*verbose*/, index );
1273 }
1274
1275 bool wxImage::SaveFile( wxOutputStream& stream, int type ) const
1276 {
1277     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1278
1279     wxImageHandler *handler = FindHandler(type);
1280
1281     if (handler == 0)
1282     {
1283         wxLogWarning( _("No image handler for type %d defined."), type );
1284
1285         return false;
1286     }
1287
1288     return handler->SaveFile( (wxImage*)this, stream );
1289 }
1290
1291 bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype ) const
1292 {
1293     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1294
1295     wxImageHandler *handler = FindHandlerMime(mimetype);
1296
1297     if (handler == 0)
1298     {
1299         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1300
1301         return false;
1302     }
1303
1304     return handler->SaveFile( (wxImage*)this, stream );
1305 }
1306 #endif // wxUSE_STREAMS
1307
1308 void wxImage::AddHandler( wxImageHandler *handler )
1309 {
1310     // Check for an existing handler of the type being added.
1311     if (FindHandler( handler->GetType() ) == 0)
1312     {
1313         sm_handlers.Append( handler );
1314     }
1315     else
1316     {
1317         // This is not documented behaviour, merely the simplest 'fix'
1318         // for preventing duplicate additions.  If someone ever has
1319         // a good reason to add and remove duplicate handlers (and they
1320         // may) we should probably refcount the duplicates.
1321         //   also an issue in InsertHandler below.
1322
1323         wxLogDebug( _T("Adding duplicate image handler for '%s'"),
1324                     handler->GetName().c_str() );
1325         delete handler;
1326     }
1327 }
1328
1329 void wxImage::InsertHandler( wxImageHandler *handler )
1330 {
1331     // Check for an existing handler of the type being added.
1332     if (FindHandler( handler->GetType() ) == 0)
1333     {
1334         sm_handlers.Insert( handler );
1335     }
1336     else
1337     {
1338         // see AddHandler for additional comments.
1339         wxLogDebug( _T("Inserting duplicate image handler for '%s'"),
1340                     handler->GetName().c_str() );
1341         delete handler;
1342     }
1343 }
1344
1345 bool wxImage::RemoveHandler( const wxString& name )
1346 {
1347     wxImageHandler *handler = FindHandler(name);
1348     if (handler)
1349     {
1350         sm_handlers.DeleteObject(handler);
1351         delete handler;
1352         return true;
1353     }
1354     else
1355         return false;
1356 }
1357
1358 wxImageHandler *wxImage::FindHandler( const wxString& name )
1359 {
1360     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1361     while (node)
1362     {
1363         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1364         if (handler->GetName().Cmp(name) == 0) return handler;
1365
1366         node = node->GetNext();
1367     }
1368     return 0;
1369 }
1370
1371 wxImageHandler *wxImage::FindHandler( const wxString& extension, long bitmapType )
1372 {
1373     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1374     while (node)
1375     {
1376         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1377         if ( (handler->GetExtension().Cmp(extension) == 0) &&
1378             (bitmapType == -1 || handler->GetType() == bitmapType) )
1379             return handler;
1380         node = node->GetNext();
1381     }
1382     return 0;
1383 }
1384
1385 wxImageHandler *wxImage::FindHandler( long bitmapType )
1386 {
1387     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1388     while (node)
1389     {
1390         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1391         if (handler->GetType() == bitmapType) return handler;
1392         node = node->GetNext();
1393     }
1394     return 0;
1395 }
1396
1397 wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype )
1398 {
1399     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1400     while (node)
1401     {
1402         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1403         if (handler->GetMimeType().IsSameAs(mimetype, false)) return handler;
1404         node = node->GetNext();
1405     }
1406     return 0;
1407 }
1408
1409 void wxImage::InitStandardHandlers()
1410 {
1411 #if wxUSE_STREAMS
1412     AddHandler(new wxBMPHandler);
1413 #endif // wxUSE_STREAMS
1414 }
1415
1416 void wxImage::CleanUpHandlers()
1417 {
1418     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1419     while (node)
1420     {
1421         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1422         wxList::compatibility_iterator next = node->GetNext();
1423         delete handler;
1424         node = next;
1425     }
1426
1427     sm_handlers.Clear();
1428 }
1429
1430 wxString wxImage::GetImageExtWildcard()
1431 {
1432     wxString fmts;
1433
1434     wxList& Handlers = wxImage::GetHandlers();
1435     wxList::compatibility_iterator Node = Handlers.GetFirst();
1436     while ( Node )
1437     {
1438         wxImageHandler* Handler = (wxImageHandler*)Node->GetData();
1439         fmts += wxT("*.") + Handler->GetExtension();
1440         Node = Node->GetNext();
1441         if ( Node ) fmts += wxT(";");
1442     }
1443
1444     return wxT("(") + fmts + wxT(")|") + fmts;
1445 }
1446
1447 //-----------------------------------------------------------------------------
1448 // wxImageHandler
1449 //-----------------------------------------------------------------------------
1450
1451 IMPLEMENT_ABSTRACT_CLASS(wxImageHandler,wxObject)
1452
1453 #if wxUSE_STREAMS
1454 bool wxImageHandler::LoadFile( wxImage *WXUNUSED(image), wxInputStream& WXUNUSED(stream), bool WXUNUSED(verbose), int WXUNUSED(index) )
1455 {
1456     return false;
1457 }
1458
1459 bool wxImageHandler::SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream), bool WXUNUSED(verbose) )
1460 {
1461     return false;
1462 }
1463
1464 int wxImageHandler::GetImageCount( wxInputStream& WXUNUSED(stream) )
1465 {
1466     return 1;
1467 }
1468
1469 bool wxImageHandler::CanRead( const wxString& name )
1470 {
1471     if (wxFileExists(name))
1472     {
1473         wxFileInputStream stream(name);
1474         return CanRead(stream);
1475     }
1476
1477     wxLogError( _("Can't check image format of file '%s': file does not exist."), name.c_str() );
1478
1479     return false;
1480 }
1481
1482 bool wxImageHandler::CallDoCanRead(wxInputStream& stream)
1483 {
1484     wxFileOffset posOld = stream.TellI();
1485     if ( posOld == wxInvalidOffset )
1486     {
1487         // can't test unseekable stream
1488         return false;
1489     }
1490
1491     bool ok = DoCanRead(stream);
1492
1493     // restore the old position to be able to test other formats and so on
1494     if ( stream.SeekI(posOld) == wxInvalidOffset )
1495     {
1496         wxLogDebug(_T("Failed to rewind the stream in wxImageHandler!"));
1497
1498         // reading would fail anyhow as we're not at the right position
1499         return false;
1500     }
1501
1502     return ok;
1503 }
1504
1505 #endif // wxUSE_STREAMS
1506
1507 // ----------------------------------------------------------------------------
1508 // image histogram stuff
1509 // ----------------------------------------------------------------------------
1510
1511 bool
1512 wxImageHistogram::FindFirstUnusedColour(unsigned char *r,
1513                                         unsigned char *g,
1514                                         unsigned char *b,
1515                                         unsigned char r2,
1516                                         unsigned char b2,
1517                                         unsigned char g2) const
1518 {
1519     unsigned long key = MakeKey(r2, g2, b2);
1520
1521     while ( find(key) != end() )
1522     {
1523         // color already used
1524         r2++;
1525         if ( r2 >= 255 )
1526         {
1527             r2 = 0;
1528             g2++;
1529             if ( g2 >= 255 )
1530             {
1531                 g2 = 0;
1532                 b2++;
1533                 if ( b2 >= 255 )
1534                 {
1535                     wxLogError(_("No unused colour in image.") );
1536                     return false;
1537                 }
1538             }
1539         }
1540
1541         key = MakeKey(r2, g2, b2);
1542     }
1543
1544     if ( r )
1545         *r = r2;
1546     if ( g )
1547         *g = g2;
1548     if ( b )
1549         *b = b2;
1550
1551     return true;
1552 }
1553
1554 bool
1555 wxImage::FindFirstUnusedColour(unsigned char *r,
1556                                unsigned char *g,
1557                                unsigned char *b,
1558                                unsigned char r2,
1559                                unsigned char b2,
1560                                unsigned char g2) const
1561 {
1562     wxImageHistogram histogram;
1563
1564     ComputeHistogram(histogram);
1565
1566     return histogram.FindFirstUnusedColour(r, g, b, r2, g2, b2);
1567 }
1568
1569
1570
1571 // GRG, Dic/99
1572 // Counts and returns the number of different colours. Optionally stops
1573 // when it exceeds 'stopafter' different colours. This is useful, for
1574 // example, to see if the image can be saved as 8-bit (256 colour or
1575 // less, in this case it would be invoked as CountColours(256)). Default
1576 // value for stopafter is -1 (don't care).
1577 //
1578 unsigned long wxImage::CountColours( unsigned long stopafter ) const
1579 {
1580     wxHashTable h;
1581     wxObject dummy;
1582     unsigned char r, g, b;
1583     unsigned char *p;
1584     unsigned long size, nentries, key;
1585
1586     p = GetData();
1587     size = GetWidth() * GetHeight();
1588     nentries = 0;
1589
1590     for (unsigned long j = 0; (j < size) && (nentries <= stopafter) ; j++)
1591     {
1592         r = *(p++);
1593         g = *(p++);
1594         b = *(p++);
1595         key = wxImageHistogram::MakeKey(r, g, b);
1596
1597         if (h.Get(key) == NULL)
1598         {
1599             h.Put(key, &dummy);
1600             nentries++;
1601         }
1602     }
1603
1604     return nentries;
1605 }
1606
1607
1608 unsigned long wxImage::ComputeHistogram( wxImageHistogram &h ) const
1609 {
1610     unsigned char *p = GetData();
1611     unsigned long nentries = 0;
1612
1613     h.clear();
1614
1615     const unsigned long size = GetWidth() * GetHeight();
1616
1617     unsigned char r, g, b;
1618     for ( unsigned long n = 0; n < size; n++ )
1619     {
1620         r = *p++;
1621         g = *p++;
1622         b = *p++;
1623
1624         wxImageHistogramEntry& entry = h[wxImageHistogram::MakeKey(r, g, b)];
1625
1626         if ( entry.value++ == 0 )
1627             entry.index = nentries++;
1628     }
1629
1630     return nentries;
1631 }
1632
1633 /*
1634  * Rotation code by Carlos Moreno
1635  */
1636
1637 // GRG: I've removed wxRotationPoint - we already have wxRealPoint which
1638 //      does exactly the same thing. And I also got rid of wxRotationPixel
1639 //      bacause of potential problems in architectures where alignment
1640 //      is an issue, so I had to rewrite parts of the code.
1641
1642 static const double gs_Epsilon = 1e-10;
1643
1644 static inline int wxCint (double x)
1645 {
1646     return (x > 0) ? (int) (x + 0.5) : (int) (x - 0.5);
1647 }
1648
1649
1650 // Auxiliary function to rotate a point (x,y) with respect to point p0
1651 // make it inline and use a straight return to facilitate optimization
1652 // also, the function receives the sine and cosine of the angle to avoid
1653 // repeating the time-consuming calls to these functions -- sin/cos can
1654 // be computed and stored in the calling function.
1655
1656 inline wxRealPoint rotated_point (const wxRealPoint & p, double cos_angle, double sin_angle, const wxRealPoint & p0)
1657 {
1658     return wxRealPoint (p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle,
1659                         p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle);
1660 }
1661
1662 inline wxRealPoint rotated_point (double x, double y, double cos_angle, double sin_angle, const wxRealPoint & p0)
1663 {
1664     return rotated_point (wxRealPoint(x,y), cos_angle, sin_angle, p0);
1665 }
1666
1667 wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool interpolating, wxPoint * offset_after_rotation) const
1668 {
1669     int i;
1670     angle = -angle;     // screen coordinates are a mirror image of "real" coordinates
1671
1672     // Create pointer-based array to accelerate access to wxImage's data
1673     unsigned char ** data = new unsigned char * [GetHeight()];
1674
1675     data[0] = GetData();
1676
1677     for (i = 1; i < GetHeight(); i++)
1678         data[i] = data[i - 1] + (3 * GetWidth());
1679
1680     // precompute coefficients for rotation formula
1681     // (sine and cosine of the angle)
1682     const double cos_angle = cos(angle);
1683     const double sin_angle = sin(angle);
1684
1685     // Create new Image to store the result
1686     // First, find rectangle that covers the rotated image;  to do that,
1687     // rotate the four corners
1688
1689     const wxRealPoint p0(centre_of_rotation.x, centre_of_rotation.y);
1690
1691     wxRealPoint p1 = rotated_point (0, 0, cos_angle, sin_angle, p0);
1692     wxRealPoint p2 = rotated_point (0, GetHeight(), cos_angle, sin_angle, p0);
1693     wxRealPoint p3 = rotated_point (GetWidth(), 0, cos_angle, sin_angle, p0);
1694     wxRealPoint p4 = rotated_point (GetWidth(), GetHeight(), cos_angle, sin_angle, p0);
1695
1696     int x1 = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x)));
1697     int y1 = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y)));
1698     int x2 = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x)));
1699     int y2 = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y)));
1700
1701     wxImage rotated (x2 - x1 + 1, y2 - y1 + 1, false);
1702
1703     if (offset_after_rotation != NULL)
1704     {
1705         *offset_after_rotation = wxPoint (x1, y1);
1706     }
1707
1708     // GRG: The rotated (destination) image is always accessed
1709     //      sequentially, so there is no need for a pointer-based
1710     //      array here (and in fact it would be slower).
1711     //
1712     unsigned char * dst = rotated.GetData();
1713
1714     // GRG: if the original image has a mask, use its RGB values
1715     //      as the blank pixel, else, fall back to default (black).
1716     //
1717     unsigned char blank_r = 0;
1718     unsigned char blank_g = 0;
1719     unsigned char blank_b = 0;
1720
1721     if (HasMask())
1722     {
1723         blank_r = GetMaskRed();
1724         blank_g = GetMaskGreen();
1725         blank_b = GetMaskBlue();
1726         rotated.SetMaskColour( blank_r, blank_g, blank_b );
1727     }
1728
1729     // Now, for each point of the rotated image, find where it came from, by
1730     // performing an inverse rotation (a rotation of -angle) and getting the
1731     // pixel at those coordinates
1732
1733     // GRG: I've taken the (interpolating) test out of the loops, so that
1734     //      it is done only once, instead of repeating it for each pixel.
1735
1736     int x;
1737     if (interpolating)
1738     {
1739         for (int y = 0; y < rotated.GetHeight(); y++)
1740         {
1741             for (x = 0; x < rotated.GetWidth(); x++)
1742             {
1743                 wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
1744
1745                 if (-0.25 < src.x && src.x < GetWidth() - 0.75 &&
1746                     -0.25 < src.y && src.y < GetHeight() - 0.75)
1747                 {
1748                     // interpolate using the 4 enclosing grid-points.  Those
1749                     // points can be obtained using floor and ceiling of the
1750                     // exact coordinates of the point
1751                         // C.M. 2000-02-17:  when the point is near the border, special care is required.
1752
1753                     int x1, y1, x2, y2;
1754
1755                     if (0 < src.x && src.x < GetWidth() - 1)
1756                     {
1757                         x1 = wxCint(floor(src.x));
1758                         x2 = wxCint(ceil(src.x));
1759                     }
1760                     else    // else means that x is near one of the borders (0 or width-1)
1761                     {
1762                         x1 = x2 = wxCint (src.x);
1763                     }
1764
1765                     if (0 < src.y && src.y < GetHeight() - 1)
1766                     {
1767                         y1 = wxCint(floor(src.y));
1768                         y2 = wxCint(ceil(src.y));
1769                     }
1770                     else
1771                     {
1772                         y1 = y2 = wxCint (src.y);
1773                     }
1774
1775                     // get four points and the distances (square of the distance,
1776                     // for efficiency reasons) for the interpolation formula
1777
1778                     // GRG: Do not calculate the points until they are
1779                     //      really needed -- this way we can calculate
1780                     //      just one, instead of four, if d1, d2, d3
1781                     //      or d4 are < gs_Epsilon
1782
1783                     const double d1 = (src.x - x1) * (src.x - x1) + (src.y - y1) * (src.y - y1);
1784                     const double d2 = (src.x - x2) * (src.x - x2) + (src.y - y1) * (src.y - y1);
1785                     const double d3 = (src.x - x2) * (src.x - x2) + (src.y - y2) * (src.y - y2);
1786                     const double d4 = (src.x - x1) * (src.x - x1) + (src.y - y2) * (src.y - y2);
1787
1788                     // Now interpolate as a weighted average of the four surrounding
1789                     // points, where the weights are the distances to each of those points
1790
1791                     // If the point is exactly at one point of the grid of the source
1792                     // image, then don't interpolate -- just assign the pixel
1793
1794                     if (d1 < gs_Epsilon)        // d1,d2,d3,d4 are positive -- no need for abs()
1795                     {
1796                         unsigned char *p = data[y1] + (3 * x1);
1797                         *(dst++) = *(p++);
1798                         *(dst++) = *(p++);
1799                         *(dst++) = *(p++);
1800                     }
1801                     else if (d2 < gs_Epsilon)
1802                     {
1803                         unsigned char *p = data[y1] + (3 * x2);
1804                         *(dst++) = *(p++);
1805                         *(dst++) = *(p++);
1806                         *(dst++) = *(p++);
1807                     }
1808                     else if (d3 < gs_Epsilon)
1809                     {
1810                         unsigned char *p = data[y2] + (3 * x2);
1811                         *(dst++) = *(p++);
1812                         *(dst++) = *(p++);
1813                         *(dst++) = *(p++);
1814                     }
1815                     else if (d4 < gs_Epsilon)
1816                     {
1817                         unsigned char *p = data[y2] + (3 * x1);
1818                         *(dst++) = *(p++);
1819                         *(dst++) = *(p++);
1820                         *(dst++) = *(p++);
1821                     }
1822                     else
1823                     {
1824                         // weights for the weighted average are proportional to the inverse of the distance
1825                         unsigned char *v1 = data[y1] + (3 * x1);
1826                         unsigned char *v2 = data[y1] + (3 * x2);
1827                         unsigned char *v3 = data[y2] + (3 * x2);
1828                         unsigned char *v4 = data[y2] + (3 * x1);
1829
1830                         const double w1 = 1/d1, w2 = 1/d2, w3 = 1/d3, w4 = 1/d4;
1831
1832                         // GRG: Unrolled.
1833
1834                         *(dst++) = (unsigned char)
1835                             ( (w1 * *(v1++) + w2 * *(v2++) +
1836                                w3 * *(v3++) + w4 * *(v4++)) /
1837                               (w1 + w2 + w3 + w4) );
1838                         *(dst++) = (unsigned char)
1839                             ( (w1 * *(v1++) + w2 * *(v2++) +
1840                                w3 * *(v3++) + w4 * *(v4++)) /
1841                               (w1 + w2 + w3 + w4) );
1842                         *(dst++) = (unsigned char)
1843                             ( (w1 * *v1 + w2 * *v2 +
1844                                w3 * *v3 + w4 * *v4) /
1845                               (w1 + w2 + w3 + w4) );
1846                     }
1847                 }
1848                 else
1849                 {
1850                     *(dst++) = blank_r;
1851                     *(dst++) = blank_g;
1852                     *(dst++) = blank_b;
1853                 }
1854             }
1855         }
1856     }
1857     else    // not interpolating
1858     {
1859         for (int y = 0; y < rotated.GetHeight(); y++)
1860         {
1861             for (x = 0; x < rotated.GetWidth(); x++)
1862             {
1863                 wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
1864
1865                 const int xs = wxCint (src.x);      // wxCint rounds to the
1866                 const int ys = wxCint (src.y);      // closest integer
1867
1868                 if (0 <= xs && xs < GetWidth() &&
1869                     0 <= ys && ys < GetHeight())
1870                 {
1871                     unsigned char *p = data[ys] + (3 * xs);
1872                     *(dst++) = *(p++);
1873                     *(dst++) = *(p++);
1874                     *(dst++) = *p;
1875                 }
1876                 else
1877                 {
1878                     *(dst++) = blank_r;
1879                     *(dst++) = blank_g;
1880                     *(dst++) = blank_b;
1881                 }
1882             }
1883         }
1884     }
1885
1886     delete [] data;
1887
1888     return rotated;
1889 }
1890
1891
1892
1893
1894
1895 // A module to allow wxImage initialization/cleanup
1896 // without calling these functions from app.cpp or from
1897 // the user's application.
1898
1899 class wxImageModule: public wxModule
1900 {
1901 DECLARE_DYNAMIC_CLASS(wxImageModule)
1902 public:
1903     wxImageModule() {}
1904     bool OnInit() { wxImage::InitStandardHandlers(); return true; };
1905     void OnExit() { wxImage::CleanUpHandlers(); };
1906 };
1907
1908 IMPLEMENT_DYNAMIC_CLASS(wxImageModule, wxModule)
1909
1910
1911 #endif // wxUSE_IMAGE