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 bool wxImage::ConvertColourToAlpha( unsigned char r, unsigned char g, unsigned char b )
 808 {
 809     SetAlpha( NULL );
 810
 811     int w = M_IMGDATA->m_width,
 812         h = M_IMGDATA->m_height;
 813
 814     unsigned char *alpha = GetAlpha();
 815     unsigned char *data = GetData();
 816
 817     int x,y;
 818     for (y = 0; y < h; y++)
 819         for (x = 0; x < w; x++)
 820             {
 821                 *alpha = *data;
 822                 alpha++;
 823                 *data = r;
 824                 data++;
 825                 *data = g;
 826                 data++;
 827                 *data = b;
 828                 data++;
 829             }
 830
 831     return true;
 832 }
 833
 834 void wxImage::SetAlpha( unsigned char *alpha )
 835 {
 836     wxCHECK_RET( Ok(), wxT("invalid image") );
 837
 838     if ( !alpha )
 839     {
 840         alpha = (unsigned char *)malloc(M_IMGDATA->m_width*M_IMGDATA->m_height);
 841     }
 842
 843     free(M_IMGDATA->m_alpha);
 844     M_IMGDATA->m_alpha = alpha;
 845 }
 846
 847 unsigned char *wxImage::GetAlpha() const
 848 {
 849     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
 850
 851     return M_IMGDATA->m_alpha;
 852 }
 853
 854 // ----------------------------------------------------------------------------
 855 // mask support
 856 // ----------------------------------------------------------------------------
 857
 858 void wxImage::SetMaskColour( unsigned char r, unsigned char g, unsigned char b )
 859 {
 860     wxCHECK_RET( Ok(), wxT("invalid image") );
 861
 862     M_IMGDATA->m_maskRed = r;
 863     M_IMGDATA->m_maskGreen = g;
 864     M_IMGDATA->m_maskBlue = b;
 865     M_IMGDATA->m_hasMask = true;
 866 }
 867
 868 unsigned char wxImage::GetMaskRed() const
 869 {
 870     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 871
 872     return M_IMGDATA->m_maskRed;
 873 }
 874
 875 unsigned char wxImage::GetMaskGreen() const
 876 {
 877     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 878
 879     return M_IMGDATA->m_maskGreen;
 880 }
 881
 882 unsigned char wxImage::GetMaskBlue() const
 883 {
 884     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 885
 886     return M_IMGDATA->m_maskBlue;
 887 }
 888
 889 void wxImage::SetMask( bool mask )
 890 {
 891     wxCHECK_RET( Ok(), wxT("invalid image") );
 892
 893     M_IMGDATA->m_hasMask = mask;
 894 }
 895
 896 bool wxImage::HasMask() const
 897 {
 898     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
 899
 900     return M_IMGDATA->m_hasMask;
 901 }
 902
 903 int wxImage::GetWidth() const
 904 {
 905     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 906
 907     return M_IMGDATA->m_width;
 908 }
 909
 910 int wxImage::GetHeight() const
 911 {
 912     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 913
 914     return M_IMGDATA->m_height;
 915 }
 916
 917 bool wxImage::SetMaskFromImage(const wxImage& mask,
 918                                unsigned char mr, unsigned char mg, unsigned char mb)
 919 {
 920     // check that the images are the same size
 921     if ( (M_IMGDATA->m_height != mask.GetHeight() ) || (M_IMGDATA->m_width != mask.GetWidth () ) )
 922     {
 923         wxLogError( _("Image and mask have different sizes.") );
 924         return false;
 925     }
 926
 927     // find unused colour
 928     unsigned char r,g,b ;
 929     if (!FindFirstUnusedColour(&r, &g, &b))
 930     {
 931         wxLogError( _("No unused colour in image being masked.") );
 932         return false ;
 933     }
 934
 935     unsigned char *imgdata = GetData();
 936     unsigned char *maskdata = mask.GetData();
 937
 938     const int w = GetWidth();
 939     const int h = GetHeight();
 940
 941     for (int j = 0; j < h; j++)
 942     {
 943         for (int i = 0; i < w; i++)
 944         {
 945             if ((maskdata[0] == mr) && (maskdata[1]  == mg) && (maskdata[2] == mb))
 946             {
 947                 imgdata[0] = r;
 948                 imgdata[1] = g;
 949                 imgdata[2] = b;
 950             }
 951             imgdata  += 3;
 952             maskdata += 3;
 953         }
 954     }
 955
 956     SetMaskColour(r, g, b);
 957     SetMask(true);
 958
 959     return true;
 960 }
 961
 962 bool wxImage::ConvertAlphaToMask(unsigned char threshold)
 963 {
 964     if (!HasAlpha())
 965         return true;
 966
 967     unsigned char mr, mg, mb;
 968     if (!FindFirstUnusedColour(&mr, &mg, &mb))
 969     {
 970         wxLogError( _("No unused colour in image being masked.") );
 971         return false;
 972     }
 973
 974     SetMask(true);
 975     SetMaskColour(mr, mg, mb);
 976
 977     unsigned char *imgdata = GetData();
 978     unsigned char *alphadata = GetAlpha();
 979
 980     int w = GetWidth();
 981     int h = GetHeight();
 982
 983     for (int y = 0; y < h; y++)
 984     {
 985         for (int x = 0; x < w; x++, imgdata += 3, alphadata++)
 986         {
 987             if (*alphadata < threshold)
 988             {
 989                 imgdata[0] = mr;
 990                 imgdata[1] = mg;
 991                 imgdata[2] = mb;
 992             }
 993         }
 994     }
 995
 996     free(M_IMGDATA->m_alpha);
 997     M_IMGDATA->m_alpha = NULL;
 998
 999     return true;
1000 }
1001
1002 #if wxUSE_PALETTE
1003
1004 // Palette functions
1005
1006 bool wxImage::HasPalette() const
1007 {
1008     if (!Ok())
1009         return false;
1010
1011     return M_IMGDATA->m_palette.Ok();
1012 }
1013
1014 const wxPalette& wxImage::GetPalette() const
1015 {
1016     wxCHECK_MSG( Ok(), wxNullPalette, wxT("invalid image") );
1017
1018     return M_IMGDATA->m_palette;
1019 }
1020
1021 void wxImage::SetPalette(const wxPalette& palette)
1022 {
1023     wxCHECK_RET( Ok(), wxT("invalid image") );
1024
1025     M_IMGDATA->m_palette = palette;
1026 }
1027
1028 #endif // wxUSE_PALETTE
1029
1030 // Option functions (arbitrary name/value mapping)
1031 void wxImage::SetOption(const wxString& name, const wxString& value)
1032 {
1033     wxCHECK_RET( Ok(), wxT("invalid image") );
1034
1035     int idx = M_IMGDATA->m_optionNames.Index(name, false);
1036     if (idx == wxNOT_FOUND)
1037     {
1038         M_IMGDATA->m_optionNames.Add(name);
1039         M_IMGDATA->m_optionValues.Add(value);
1040     }
1041     else
1042     {
1043         M_IMGDATA->m_optionNames[idx] = name;
1044         M_IMGDATA->m_optionValues[idx] = value;
1045     }
1046 }
1047
1048 void wxImage::SetOption(const wxString& name, int value)
1049 {
1050     wxString valStr;
1051     valStr.Printf(wxT("%d"), value);
1052     SetOption(name, valStr);
1053 }
1054
1055 wxString wxImage::GetOption(const wxString& name) const
1056 {
1057     wxCHECK_MSG( Ok(), wxEmptyString, wxT("invalid image") );
1058
1059     int idx = M_IMGDATA->m_optionNames.Index(name, false);
1060     if (idx == wxNOT_FOUND)
1061         return wxEmptyString;
1062     else
1063         return M_IMGDATA->m_optionValues[idx];
1064 }
1065
1066 int wxImage::GetOptionInt(const wxString& name) const
1067 {
1068     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1069
1070     return wxAtoi(GetOption(name));
1071 }
1072
1073 bool wxImage::HasOption(const wxString& name) const
1074 {
1075     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1076
1077     return (M_IMGDATA->m_optionNames.Index(name, false) != wxNOT_FOUND);
1078 }
1079
1080 bool wxImage::LoadFile( const wxString& filename, long type, int index )
1081 {
1082 #if wxUSE_STREAMS
1083     if (wxFileExists(filename))
1084     {
1085         wxFileInputStream stream(filename);
1086         wxBufferedInputStream bstream( stream );
1087         return LoadFile(bstream, type, index);
1088     }
1089     else
1090     {
1091         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
1092
1093         return false;
1094     }
1095 #else // !wxUSE_STREAMS
1096     return false;
1097 #endif // wxUSE_STREAMS
1098 }
1099
1100 bool wxImage::LoadFile( const wxString& filename, const wxString& mimetype, int index )
1101 {
1102 #if wxUSE_STREAMS
1103     if (wxFileExists(filename))
1104     {
1105         wxFileInputStream stream(filename);
1106         wxBufferedInputStream bstream( stream );
1107         return LoadFile(bstream, mimetype, index);
1108     }
1109     else
1110     {
1111         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
1112
1113         return false;
1114     }
1115 #else // !wxUSE_STREAMS
1116     return false;
1117 #endif // wxUSE_STREAMS
1118 }
1119
1120
1121
1122 bool wxImage::SaveFile( const wxString& filename ) const
1123 {
1124     wxString ext = filename.AfterLast('.').Lower();
1125
1126     wxImageHandler * pHandler = FindHandler(ext, -1);
1127     if (pHandler)
1128     {
1129         SaveFile(filename, pHandler->GetType());
1130         return true;
1131     }
1132
1133     wxLogError(_("Can't save image to file '%s': unknown extension."), filename.c_str());
1134
1135     return false;
1136 }
1137
1138 bool wxImage::SaveFile( const wxString& filename, int type ) const
1139 {
1140 #if wxUSE_STREAMS
1141     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
1142
1143     wxFileOutputStream stream(filename);
1144
1145     if ( stream.IsOk() )
1146     {
1147         wxBufferedOutputStream bstream( stream );
1148         return SaveFile(bstream, type);
1149     }
1150 #endif // wxUSE_STREAMS
1151
1152     return false;
1153 }
1154
1155 bool wxImage::SaveFile( const wxString& filename, const wxString& mimetype ) const
1156 {
1157 #if wxUSE_STREAMS
1158     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
1159
1160     wxFileOutputStream stream(filename);
1161
1162     if ( stream.IsOk() )
1163     {
1164         wxBufferedOutputStream bstream( stream );
1165         return SaveFile(bstream, mimetype);
1166     }
1167 #endif // wxUSE_STREAMS
1168
1169     return false;
1170 }
1171
1172 bool wxImage::CanRead( const wxString &name )
1173 {
1174 #if wxUSE_STREAMS
1175   wxFileInputStream stream(name);
1176   return CanRead(stream);
1177 #else
1178   return false;
1179 #endif
1180 }
1181
1182 int wxImage::GetImageCount( const wxString &name, long type )
1183 {
1184 #if wxUSE_STREAMS
1185   wxFileInputStream stream(name);
1186   if (stream.Ok())
1187       return GetImageCount(stream, type);
1188 #endif
1189
1190   return 0;
1191 }
1192
1193 #if wxUSE_STREAMS
1194
1195 bool wxImage::CanRead( wxInputStream &stream )
1196 {
1197     const wxList& list = GetHandlers();
1198
1199     for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
1200     {
1201         wxImageHandler *handler=(wxImageHandler*)node->GetData();
1202         if (handler->CanRead( stream ))
1203             return true;
1204     }
1205
1206     return false;
1207 }
1208
1209 int wxImage::GetImageCount( wxInputStream &stream, long type )
1210 {
1211     wxImageHandler *handler;
1212
1213     if ( type == wxBITMAP_TYPE_ANY )
1214     {
1215         wxList &list=GetHandlers();
1216
1217         for (wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext())
1218         {
1219              handler=(wxImageHandler*)node->GetData();
1220              if ( handler->CanRead(stream) )
1221                  return handler->GetImageCount(stream);
1222
1223         }
1224
1225         wxLogWarning(_("No handler found for image type."));
1226         return 0;
1227     }
1228
1229     handler = FindHandler(type);
1230
1231     if ( !handler )
1232     {
1233         wxLogWarning(_("No image handler for type %d defined."), type);
1234         return false;
1235     }
1236
1237     if ( handler->CanRead(stream) )
1238     {
1239         return handler->GetImageCount(stream);
1240     }
1241     else
1242     {
1243         wxLogError(_("Image file is not of type %d."), type);
1244         return 0;
1245     }
1246 }
1247
1248 bool wxImage::LoadFile( wxInputStream& stream, long type, int index )
1249 {
1250     UnRef();
1251
1252     m_refData = new wxImageRefData;
1253
1254     wxImageHandler *handler;
1255
1256     if ( type == wxBITMAP_TYPE_ANY )
1257     {
1258         wxList &list=GetHandlers();
1259
1260         for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
1261         {
1262              handler=(wxImageHandler*)node->GetData();
1263              if ( handler->CanRead(stream) )
1264                  return handler->LoadFile(this, stream, true/*verbose*/, index);
1265
1266         }
1267
1268         wxLogWarning( _("No handler found for image type.") );
1269         return false;
1270     }
1271
1272     handler = FindHandler(type);
1273
1274     if (handler == 0)
1275     {
1276         wxLogWarning( _("No image handler for type %d defined."), type );
1277
1278         return false;
1279     }
1280
1281     return handler->LoadFile(this, stream, true/*verbose*/, index);
1282 }
1283
1284 bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int index )
1285 {
1286     UnRef();
1287
1288     m_refData = new wxImageRefData;
1289
1290     wxImageHandler *handler = FindHandlerMime(mimetype);
1291
1292     if (handler == 0)
1293     {
1294         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1295
1296         return false;
1297     }
1298
1299     return handler->LoadFile( this, stream, true/*verbose*/, index );
1300 }
1301
1302 bool wxImage::SaveFile( wxOutputStream& stream, int type ) const
1303 {
1304     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1305
1306     wxImageHandler *handler = FindHandler(type);
1307
1308     if (handler == 0)
1309     {
1310         wxLogWarning( _("No image handler for type %d defined."), type );
1311
1312         return false;
1313     }
1314
1315     return handler->SaveFile( (wxImage*)this, stream );
1316 }
1317
1318 bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype ) const
1319 {
1320     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1321
1322     wxImageHandler *handler = FindHandlerMime(mimetype);
1323
1324     if (handler == 0)
1325     {
1326         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1327
1328         return false;
1329     }
1330
1331     return handler->SaveFile( (wxImage*)this, stream );
1332 }
1333 #endif // wxUSE_STREAMS
1334
1335 void wxImage::AddHandler( wxImageHandler *handler )
1336 {
1337     // Check for an existing handler of the type being added.
1338     if (FindHandler( handler->GetType() ) == 0)
1339     {
1340         sm_handlers.Append( handler );
1341     }
1342     else
1343     {
1344         // This is not documented behaviour, merely the simplest 'fix'
1345         // for preventing duplicate additions.  If someone ever has
1346         // a good reason to add and remove duplicate handlers (and they
1347         // may) we should probably refcount the duplicates.
1348         //   also an issue in InsertHandler below.
1349
1350         wxLogDebug( _T("Adding duplicate image handler for '%s'"),
1351                     handler->GetName().c_str() );
1352         delete handler;
1353     }
1354 }
1355
1356 void wxImage::InsertHandler( wxImageHandler *handler )
1357 {
1358     // Check for an existing handler of the type being added.
1359     if (FindHandler( handler->GetType() ) == 0)
1360     {
1361         sm_handlers.Insert( handler );
1362     }
1363     else
1364     {
1365         // see AddHandler for additional comments.
1366         wxLogDebug( _T("Inserting duplicate image handler for '%s'"),
1367                     handler->GetName().c_str() );
1368         delete handler;
1369     }
1370 }
1371
1372 bool wxImage::RemoveHandler( const wxString& name )
1373 {
1374     wxImageHandler *handler = FindHandler(name);
1375     if (handler)
1376     {
1377         sm_handlers.DeleteObject(handler);
1378         delete handler;
1379         return true;
1380     }
1381     else
1382         return false;
1383 }
1384
1385 wxImageHandler *wxImage::FindHandler( const wxString& name )
1386 {
1387     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1388     while (node)
1389     {
1390         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1391         if (handler->GetName().Cmp(name) == 0) return handler;
1392
1393         node = node->GetNext();
1394     }
1395     return 0;
1396 }
1397
1398 wxImageHandler *wxImage::FindHandler( const wxString& extension, long bitmapType )
1399 {
1400     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1401     while (node)
1402     {
1403         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1404         if ( (handler->GetExtension().Cmp(extension) == 0) &&
1405             (bitmapType == -1 || handler->GetType() == bitmapType) )
1406             return handler;
1407         node = node->GetNext();
1408     }
1409     return 0;
1410 }
1411
1412 wxImageHandler *wxImage::FindHandler( long bitmapType )
1413 {
1414     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1415     while (node)
1416     {
1417         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1418         if (handler->GetType() == bitmapType) return handler;
1419         node = node->GetNext();
1420     }
1421     return 0;
1422 }
1423
1424 wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype )
1425 {
1426     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1427     while (node)
1428     {
1429         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1430         if (handler->GetMimeType().IsSameAs(mimetype, false)) return handler;
1431         node = node->GetNext();
1432     }
1433     return 0;
1434 }
1435
1436 void wxImage::InitStandardHandlers()
1437 {
1438 #if wxUSE_STREAMS
1439     AddHandler(new wxBMPHandler);
1440 #endif // wxUSE_STREAMS
1441 }
1442
1443 void wxImage::CleanUpHandlers()
1444 {
1445     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1446     while (node)
1447     {
1448         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1449         wxList::compatibility_iterator next = node->GetNext();
1450         delete handler;
1451         node = next;
1452     }
1453
1454     sm_handlers.Clear();
1455 }
1456
1457 wxString wxImage::GetImageExtWildcard()
1458 {
1459     wxString fmts;
1460
1461     wxList& Handlers = wxImage::GetHandlers();
1462     wxList::compatibility_iterator Node = Handlers.GetFirst();
1463     while ( Node )
1464     {
1465         wxImageHandler* Handler = (wxImageHandler*)Node->GetData();
1466         fmts += wxT("*.") + Handler->GetExtension();
1467         Node = Node->GetNext();
1468         if ( Node ) fmts += wxT(";");
1469     }
1470
1471     return wxT("(") + fmts + wxT(")|") + fmts;
1472 }
1473
1474 //-----------------------------------------------------------------------------
1475 // wxImageHandler
1476 //-----------------------------------------------------------------------------
1477
1478 IMPLEMENT_ABSTRACT_CLASS(wxImageHandler,wxObject)
1479
1480 #if wxUSE_STREAMS
1481 bool wxImageHandler::LoadFile( wxImage *WXUNUSED(image), wxInputStream& WXUNUSED(stream), bool WXUNUSED(verbose), int WXUNUSED(index) )
1482 {
1483     return false;
1484 }
1485
1486 bool wxImageHandler::SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream), bool WXUNUSED(verbose) )
1487 {
1488     return false;
1489 }
1490
1491 int wxImageHandler::GetImageCount( wxInputStream& WXUNUSED(stream) )
1492 {
1493     return 1;
1494 }
1495
1496 bool wxImageHandler::CanRead( const wxString& name )
1497 {
1498     if (wxFileExists(name))
1499     {
1500         wxFileInputStream stream(name);
1501         return CanRead(stream);
1502     }
1503
1504     wxLogError( _("Can't check image format of file '%s': file does not exist."), name.c_str() );
1505
1506     return false;
1507 }
1508
1509 bool wxImageHandler::CallDoCanRead(wxInputStream& stream)
1510 {
1511     wxFileOffset posOld = stream.TellI();
1512     if ( posOld == wxInvalidOffset )
1513     {
1514         // can't test unseekable stream
1515         return false;
1516     }
1517
1518     bool ok = DoCanRead(stream);
1519
1520     // restore the old position to be able to test other formats and so on
1521     if ( stream.SeekI(posOld) == wxInvalidOffset )
1522     {
1523         wxLogDebug(_T("Failed to rewind the stream in wxImageHandler!"));
1524
1525         // reading would fail anyhow as we're not at the right position
1526         return false;
1527     }
1528
1529     return ok;
1530 }
1531
1532 #endif // wxUSE_STREAMS
1533
1534 // ----------------------------------------------------------------------------
1535 // image histogram stuff
1536 // ----------------------------------------------------------------------------
1537
1538 bool
1539 wxImageHistogram::FindFirstUnusedColour(unsigned char *r,
1540                                         unsigned char *g,
1541                                         unsigned char *b,
1542                                         unsigned char r2,
1543                                         unsigned char b2,
1544                                         unsigned char g2) const
1545 {
1546     unsigned long key = MakeKey(r2, g2, b2);
1547
1548     while ( find(key) != end() )
1549     {
1550         // color already used
1551         r2++;
1552         if ( r2 >= 255 )
1553         {
1554             r2 = 0;
1555             g2++;
1556             if ( g2 >= 255 )
1557             {
1558                 g2 = 0;
1559                 b2++;
1560                 if ( b2 >= 255 )
1561                 {
1562                     wxLogError(_("No unused colour in image.") );
1563                     return false;
1564                 }
1565             }
1566         }
1567
1568         key = MakeKey(r2, g2, b2);
1569     }
1570
1571     if ( r )
1572         *r = r2;
1573     if ( g )
1574         *g = g2;
1575     if ( b )
1576         *b = b2;
1577
1578     return true;
1579 }
1580
1581 bool
1582 wxImage::FindFirstUnusedColour(unsigned char *r,
1583                                unsigned char *g,
1584                                unsigned char *b,
1585                                unsigned char r2,
1586                                unsigned char b2,
1587                                unsigned char g2) const
1588 {
1589     wxImageHistogram histogram;
1590
1591     ComputeHistogram(histogram);
1592
1593     return histogram.FindFirstUnusedColour(r, g, b, r2, g2, b2);
1594 }
1595
1596
1597
1598 // GRG, Dic/99
1599 // Counts and returns the number of different colours. Optionally stops
1600 // when it exceeds 'stopafter' different colours. This is useful, for
1601 // example, to see if the image can be saved as 8-bit (256 colour or
1602 // less, in this case it would be invoked as CountColours(256)). Default
1603 // value for stopafter is -1 (don't care).
1604 //
1605 unsigned long wxImage::CountColours( unsigned long stopafter ) const
1606 {
1607     wxHashTable h;
1608     wxObject dummy;
1609     unsigned char r, g, b;
1610     unsigned char *p;
1611     unsigned long size, nentries, key;
1612
1613     p = GetData();
1614     size = GetWidth() * GetHeight();
1615     nentries = 0;
1616
1617     for (unsigned long j = 0; (j < size) && (nentries <= stopafter) ; j++)
1618     {
1619         r = *(p++);
1620         g = *(p++);
1621         b = *(p++);
1622         key = wxImageHistogram::MakeKey(r, g, b);
1623
1624         if (h.Get(key) == NULL)
1625         {
1626             h.Put(key, &dummy);
1627             nentries++;
1628         }
1629     }
1630
1631     return nentries;
1632 }
1633
1634
1635 unsigned long wxImage::ComputeHistogram( wxImageHistogram &h ) const
1636 {
1637     unsigned char *p = GetData();
1638     unsigned long nentries = 0;
1639
1640     h.clear();
1641
1642     const unsigned long size = GetWidth() * GetHeight();
1643
1644     unsigned char r, g, b;
1645     for ( unsigned long n = 0; n < size; n++ )
1646     {
1647         r = *p++;
1648         g = *p++;
1649         b = *p++;
1650
1651         wxImageHistogramEntry& entry = h[wxImageHistogram::MakeKey(r, g, b)];
1652
1653         if ( entry.value++ == 0 )
1654             entry.index = nentries++;
1655     }
1656
1657     return nentries;
1658 }
1659
1660 /*
1661  * Rotation code by Carlos Moreno
1662  */
1663
1664 // GRG: I've removed wxRotationPoint - we already have wxRealPoint which
1665 //      does exactly the same thing. And I also got rid of wxRotationPixel
1666 //      bacause of potential problems in architectures where alignment
1667 //      is an issue, so I had to rewrite parts of the code.
1668
1669 static const double gs_Epsilon = 1e-10;
1670
1671 static inline int wxCint (double x)
1672 {
1673     return (x > 0) ? (int) (x + 0.5) : (int) (x - 0.5);
1674 }
1675
1676
1677 // Auxiliary function to rotate a point (x,y) with respect to point p0
1678 // make it inline and use a straight return to facilitate optimization
1679 // also, the function receives the sine and cosine of the angle to avoid
1680 // repeating the time-consuming calls to these functions -- sin/cos can
1681 // be computed and stored in the calling function.
1682
1683 inline wxRealPoint rotated_point (const wxRealPoint & p, double cos_angle, double sin_angle, const wxRealPoint & p0)
1684 {
1685     return wxRealPoint (p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle,
1686                         p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle);
1687 }
1688
1689 inline wxRealPoint rotated_point (double x, double y, double cos_angle, double sin_angle, const wxRealPoint & p0)
1690 {
1691     return rotated_point (wxRealPoint(x,y), cos_angle, sin_angle, p0);
1692 }
1693
1694 wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool interpolating, wxPoint * offset_after_rotation) const
1695 {
1696     int i;
1697     angle = -angle;     // screen coordinates are a mirror image of "real" coordinates
1698
1699     bool has_alpha = HasAlpha();
1700
1701     // Create pointer-based array to accelerate access to wxImage's data
1702     unsigned char ** data = new unsigned char * [GetHeight()];
1703     data[0] = GetData();
1704     for (i = 1; i < GetHeight(); i++)
1705         data[i] = data[i - 1] + (3 * GetWidth());
1706
1707     // Same for alpha channel
1708     unsigned char ** alpha = NULL;
1709     if (has_alpha)
1710     {
1711         alpha = new unsigned char * [GetHeight()];
1712         alpha[0] = GetAlpha();
1713         for (i = 1; i < GetHeight(); i++)
1714             alpha[i] = alpha[i - 1] + GetWidth();
1715     }
1716
1717     // precompute coefficients for rotation formula
1718     // (sine and cosine of the angle)
1719     const double cos_angle = cos(angle);
1720     const double sin_angle = sin(angle);
1721
1722     // Create new Image to store the result
1723     // First, find rectangle that covers the rotated image;  to do that,
1724     // rotate the four corners
1725
1726     const wxRealPoint p0(centre_of_rotation.x, centre_of_rotation.y);
1727
1728     wxRealPoint p1 = rotated_point (0, 0, cos_angle, sin_angle, p0);
1729     wxRealPoint p2 = rotated_point (0, GetHeight(), cos_angle, sin_angle, p0);
1730     wxRealPoint p3 = rotated_point (GetWidth(), 0, cos_angle, sin_angle, p0);
1731     wxRealPoint p4 = rotated_point (GetWidth(), GetHeight(), cos_angle, sin_angle, p0);
1732
1733     int x1 = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x)));
1734     int y1 = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y)));
1735     int x2 = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x)));
1736     int y2 = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y)));
1737
1738     // Create rotated image
1739     wxImage rotated (x2 - x1 + 1, y2 - y1 + 1, false);
1740     // With alpha channel
1741     if (has_alpha)
1742         rotated.SetAlpha();
1743
1744     if (offset_after_rotation != NULL)
1745     {
1746         *offset_after_rotation = wxPoint (x1, y1);
1747     }
1748
1749     // GRG: The rotated (destination) image is always accessed
1750     //      sequentially, so there is no need for a pointer-based
1751     //      array here (and in fact it would be slower).
1752     //
1753     unsigned char * dst = rotated.GetData();
1754
1755     unsigned char * alpha_dst = NULL;
1756     if (has_alpha)
1757         alpha_dst = rotated.GetAlpha();
1758
1759     // GRG: if the original image has a mask, use its RGB values
1760     //      as the blank pixel, else, fall back to default (black).
1761     //
1762     unsigned char blank_r = 0;
1763     unsigned char blank_g = 0;
1764     unsigned char blank_b = 0;
1765
1766     if (HasMask())
1767     {
1768         blank_r = GetMaskRed();
1769         blank_g = GetMaskGreen();
1770         blank_b = GetMaskBlue();
1771         rotated.SetMaskColour( blank_r, blank_g, blank_b );
1772     }
1773
1774     // Now, for each point of the rotated image, find where it came from, by
1775     // performing an inverse rotation (a rotation of -angle) and getting the
1776     // pixel at those coordinates
1777
1778     // GRG: I've taken the (interpolating) test out of the loops, so that
1779     //      it is done only once, instead of repeating it for each pixel.
1780
1781     int x;
1782     if (interpolating)
1783     {
1784         for (int y = 0; y < rotated.GetHeight(); y++)
1785         {
1786             for (x = 0; x < rotated.GetWidth(); x++)
1787             {
1788                 wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
1789
1790                 if (-0.25 < src.x && src.x < GetWidth() - 0.75 &&
1791                     -0.25 < src.y && src.y < GetHeight() - 0.75)
1792                 {
1793                     // interpolate using the 4 enclosing grid-points.  Those
1794                     // points can be obtained using floor and ceiling of the
1795                     // exact coordinates of the point
1796                         // C.M. 2000-02-17:  when the point is near the border, special care is required.
1797
1798                     int x1, y1, x2, y2;
1799
1800                     if (0 < src.x && src.x < GetWidth() - 1)
1801                     {
1802                         x1 = wxCint(floor(src.x));
1803                         x2 = wxCint(ceil(src.x));
1804                     }
1805                     else    // else means that x is near one of the borders (0 or width-1)
1806                     {
1807                         x1 = x2 = wxCint (src.x);
1808                     }
1809
1810                     if (0 < src.y && src.y < GetHeight() - 1)
1811                     {
1812                         y1 = wxCint(floor(src.y));
1813                         y2 = wxCint(ceil(src.y));
1814                     }
1815                     else
1816                     {
1817                         y1 = y2 = wxCint (src.y);
1818                     }
1819
1820                     // get four points and the distances (square of the distance,
1821                     // for efficiency reasons) for the interpolation formula
1822
1823                     // GRG: Do not calculate the points until they are
1824                     //      really needed -- this way we can calculate
1825                     //      just one, instead of four, if d1, d2, d3
1826                     //      or d4 are < gs_Epsilon
1827
1828                     const double d1 = (src.x - x1) * (src.x - x1) + (src.y - y1) * (src.y - y1);
1829                     const double d2 = (src.x - x2) * (src.x - x2) + (src.y - y1) * (src.y - y1);
1830                     const double d3 = (src.x - x2) * (src.x - x2) + (src.y - y2) * (src.y - y2);
1831                     const double d4 = (src.x - x1) * (src.x - x1) + (src.y - y2) * (src.y - y2);
1832
1833                     // Now interpolate as a weighted average of the four surrounding
1834                     // points, where the weights are the distances to each of those points
1835
1836                     // If the point is exactly at one point of the grid of the source
1837                     // image, then don't interpolate -- just assign the pixel
1838
1839                     if (d1 < gs_Epsilon)        // d1,d2,d3,d4 are positive -- no need for abs()
1840                     {
1841                         unsigned char *p = data[y1] + (3 * x1);
1842                         *(dst++) = *(p++);
1843                         *(dst++) = *(p++);
1844                         *(dst++) = *p;
1845
1846                         if (has_alpha)
1847                         {
1848                             unsigned char *p = alpha[y1] + x1;
1849                             *(alpha_dst++) = *p;
1850                         }
1851                     }
1852                     else if (d2 < gs_Epsilon)
1853                     {
1854                         unsigned char *p = data[y1] + (3 * x2);
1855                         *(dst++) = *(p++);
1856                         *(dst++) = *(p++);
1857                         *(dst++) = *p;
1858
1859                         if (has_alpha)
1860                         {
1861                             unsigned char *p = alpha[y1] + x2;
1862                             *(alpha_dst++) = *p;
1863                         }
1864                     }
1865                     else if (d3 < gs_Epsilon)
1866                     {
1867                         unsigned char *p = data[y2] + (3 * x2);
1868                         *(dst++) = *(p++);
1869                         *(dst++) = *(p++);
1870                         *(dst++) = *p;
1871
1872                         if (has_alpha)
1873                         {
1874                             unsigned char *p = alpha[y2] + x2;
1875                             *(alpha_dst++) = *p;
1876                         }
1877                     }
1878                     else if (d4 < gs_Epsilon)
1879                     {
1880                         unsigned char *p = data[y2] + (3 * x1);
1881                         *(dst++) = *(p++);
1882                         *(dst++) = *(p++);
1883                         *(dst++) = *p;
1884
1885                         if (has_alpha)
1886                         {
1887                             unsigned char *p = alpha[y2] + x1;
1888                             *(alpha_dst++) = *p;
1889                         }
1890                     }
1891                     else
1892                     {
1893                         // weights for the weighted average are proportional to the inverse of the distance
1894                         unsigned char *v1 = data[y1] + (3 * x1);
1895                         unsigned char *v2 = data[y1] + (3 * x2);
1896                         unsigned char *v3 = data[y2] + (3 * x2);
1897                         unsigned char *v4 = data[y2] + (3 * x1);
1898
1899                         const double w1 = 1/d1, w2 = 1/d2, w3 = 1/d3, w4 = 1/d4;
1900
1901                         // GRG: Unrolled.
1902
1903                         *(dst++) = (unsigned char)
1904                             ( (w1 * *(v1++) + w2 * *(v2++) +
1905                                w3 * *(v3++) + w4 * *(v4++)) /
1906                               (w1 + w2 + w3 + w4) );
1907                         *(dst++) = (unsigned char)
1908                             ( (w1 * *(v1++) + w2 * *(v2++) +
1909                                w3 * *(v3++) + w4 * *(v4++)) /
1910                               (w1 + w2 + w3 + w4) );
1911                         *(dst++) = (unsigned char)
1912                             ( (w1 * *v1 + w2 * *v2 +
1913                                w3 * *v3 + w4 * *v4) /
1914                               (w1 + w2 + w3 + w4) );
1915
1916                         if (has_alpha)
1917                         {
1918                             unsigned char *v1 = alpha[y1] + (x1);
1919                             unsigned char *v2 = alpha[y1] + (x2);
1920                             unsigned char *v3 = alpha[y2] + (x2);
1921                             unsigned char *v4 = alpha[y2] + (x1);
1922
1923                             *(alpha_dst++) = (unsigned char)
1924                                 ( (w1 * *v1 + w2 * *v2 +
1925                                    w3 * *v3 + w4 * *v4) /
1926                                   (w1 + w2 + w3 + w4) );
1927                         }
1928                     }
1929                 }
1930                 else
1931                 {
1932                     *(dst++) = blank_r;
1933                     *(dst++) = blank_g;
1934                     *(dst++) = blank_b;
1935
1936                     if (has_alpha)
1937                         *(alpha_dst++) = 0;
1938                 }
1939             }
1940         }
1941     }
1942     else    // not interpolating
1943     {
1944         for (int y = 0; y < rotated.GetHeight(); y++)
1945         {
1946             for (x = 0; x < rotated.GetWidth(); x++)
1947             {
1948                 wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
1949
1950                 const int xs = wxCint (src.x);      // wxCint rounds to the
1951                 const int ys = wxCint (src.y);      // closest integer
1952
1953                 if (0 <= xs && xs < GetWidth() &&
1954                     0 <= ys && ys < GetHeight())
1955                 {
1956                     unsigned char *p = data[ys] + (3 * xs);
1957                     *(dst++) = *(p++);
1958                     *(dst++) = *(p++);
1959                     *(dst++) = *p;
1960
1961                     if (has_alpha)
1962                     {
1963                         unsigned char *p = alpha[ys] + (xs);
1964                         *(alpha_dst++) = *p;
1965                     }
1966                 }
1967                 else
1968                 {
1969                     *(dst++) = blank_r;
1970                     *(dst++) = blank_g;
1971                     *(dst++) = blank_b;
1972
1973                     if (has_alpha)
1974                         *(alpha_dst++) = 255;
1975                 }
1976             }
1977         }
1978     }
1979
1980     delete [] data;
1981
1982     if (has_alpha)
1983         delete [] alpha;
1984
1985     return rotated;
1986 }
1987
1988
1989
1990
1991
1992 // A module to allow wxImage initialization/cleanup
1993 // without calling these functions from app.cpp or from
1994 // the user's application.
1995
1996 class wxImageModule: public wxModule
1997 {
1998 DECLARE_DYNAMIC_CLASS(wxImageModule)
1999 public:
2000     wxImageModule() {}
2001     bool OnInit() { wxImage::InitStandardHandlers(); return true; };
2002     void OnExit() { wxImage::CleanUpHandlers(); };
2003 };
2004
2005 IMPLEMENT_DYNAMIC_CLASS(wxImageModule, wxModule)
2006
2007
2008 #endif // wxUSE_IMAGE