src/mac/carbon/pnghand.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        pnghand.cpp
   3 // Purpose:     Implements a PNG reader class + handler
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart and Markus Holzem
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #  pragma implementation "pngread.h"
  14 #  pragma implementation "pnghand.h"
  15 #endif
  16
  17 // For compilers that support precompilation, includes "wx.h".
  18 #include "wx/wxprec.h"
  19
  20 #ifdef __BORLANDC__
  21 #  pragma hdrstop
  22 #endif
  23
  24 #include <stdlib.h>
  25 #include <stdio.h>
  26 #include <string.h>
  27
  28 #if wxUSE_IOSTREAMH
  29 #   include <fstream.h>
  30 #else
  31 #   include <fstream>
  32 #endif
  33
  34 #ifndef __WXMAC_X__
  35 #  include <windows.h>
  36 #endif
  37 #include "wx/msgdlg.h"
  38 #include "wx/palette.h"
  39 #include "wx/bitmap.h"
  40 #include "wx/mac/pnghand.h"
  41 #include "wx/mac/pngread.h"
  42
  43 extern "C" {
  44 #include "png.h"
  45 }
  46
  47 extern "C" void png_read_init PNGARG((png_structp png_ptr));
  48 extern "C" void png_write_init PNGARG((png_structp png_ptr));
  49
  50 extern CTabHandle wxMacCreateColorTable( int numColors ) ;
  51 extern void wxMacDestroyColorTable( CTabHandle colors )  ;
  52 extern void wxMacSetColorTableEntry( CTabHandle newColors , int index , int red , int green ,  int blue ) ;
  53 extern GWorldPtr wxMacCreateGWorld( int width , int height , int depth ) ;
  54 extern void wxMacDestroyGWorld( GWorldPtr gw ) ;
  55
  56 void
  57 ima_png_error(png_struct *png_ptr, char *message)
  58 {
  59         wxMessageBox(message, "PNG error");
  60   longjmp(png_ptr->jmpbuf, 1);
  61 }
  62
  63
  64 // static wxGifReaderIter* iter;
  65 wxPalette *wxCopyPalette(const wxPalette *cmap);
  66
  67 wxPNGReader::wxPNGReader(void)
  68 {
  69   filetype = 0;
  70   RawImage = NULL;      //  Image data
  71
  72   Width = 0; Height = 0;       //  Dimensions
  73   Depth = 0;           // (bits x pixel)
  74   ColorType = 0;        // Bit 1 = Palette used
  75                   // Bit 2 = Color used
  76                   // Bit 3 = Alpha used
  77
  78   EfeWidth = 0;         // Efective Width
  79
  80   lpbi = NULL;
  81   bgindex = -1;
  82   m_palette = 0;
  83   imageOK = FALSE;
  84 }
  85
  86 wxPNGReader::wxPNGReader ( char* ImageFileName )
  87 {
  88   imageOK = FALSE;
  89   filetype = 0;
  90   RawImage = NULL;      //  Image data
  91
  92   Width = 0; Height = 0;       //  Dimensions
  93   Depth = 0;           // (bits x pixel)
  94   ColorType = 0;        // Bit 1 = m_palette used
  95                   // Bit 2 = Color used
  96                   // Bit 3 = Alpha used
  97
  98   EfeWidth = 0;         // Efective Width
  99
 100   lpbi = NULL;
 101   bgindex = -1;
 102   m_palette = 0;
 103
 104   imageOK = ReadFile (ImageFileName);
 105 }
 106
 107 void
 108 wxPNGReader::Create(int width, int height, int depth, int colortype)
 109 {
 110   Width = width; Height = height; Depth = depth;
 111   ColorType = (colortype>=0) ? colortype: ((Depth>8) ? COLORTYPE_COLOR: 0);
 112   delete m_palette;
 113   delete[] RawImage ;
 114   RawImage = 0;
 115   m_palette = 0;
 116
 117   if (lpbi)
 118   {
 119         wxMacDestroyGWorld( lpbi ) ;
 120   }
 121   lpbi = wxMacCreateGWorld( Width , Height , Depth);
 122   if (lpbi)
 123   {
 124     EfeWidth = (long)(((long)Width*Depth + 31) / 32) * 4;
 125     int bitwidth = width ;
 126     if ( EfeWidth > bitwidth )
 127         bitwidth = EfeWidth ;
 128
 129                 RawImage = (byte*) new char[ ( bitwidth * Height * ((Depth+7)>>3) ) ];
 130     imageOK = TRUE;
 131   }
 132 }
 133
 134 wxPNGReader::~wxPNGReader ( )
 135 {
 136         delete[] RawImage ;
 137   if (lpbi)  {
 138         wxMacDestroyGWorld( lpbi ) ;
 139   }
 140   delete m_palette;
 141 }
 142
 143
 144 int wxPNGReader::GetIndex(int x, int y)
 145 {
 146   if (!Inside(x, y) || (Depth>8)) return -1;
 147
 148   ImagePointerType ImagePointer = RawImage + EfeWidth*y + (x*Depth >> 3);
 149   int index = (int)(*ImagePointer);
 150   return index;
 151 }
 152
 153 bool wxPNGReader::GetRGB(int x, int y, byte* r, byte* g, byte* b)
 154 {
 155   if (!Inside(x, y)) return FALSE;
 156
 157   if (m_palette) {
 158    return m_palette->GetRGB(GetIndex(x, y), r, g, b);
 159 /*   PALETTEENTRY entry;
 160    ::GetPaletteEntries((HPALETTE) m_palette->GetHPALETTE(), GetIndex(x, y), 1, &entry);
 161    *r = entry.peRed;
 162    *g = entry.peGreen;
 163    *b = entry.peBlue;  */
 164   } else {
 165    ImagePointerType ImagePointer = RawImage + EfeWidth*y + (x*Depth >> 3);
 166    *b = ImagePointer[0];
 167    *g = ImagePointer[1];
 168    *r = ImagePointer[2];
 169   }
 170   return TRUE;
 171 }
 172
 173
 174 bool wxPNGReader::SetIndex(int x, int y, int index)
 175 {
 176   if (!Inside(x, y) || (Depth>8)) return FALSE;
 177
 178   ImagePointerType ImagePointer = RawImage + EfeWidth*y + (x*Depth >> 3);
 179   *ImagePointer = index;
 180
 181   return TRUE;
 182 }
 183
 184 bool wxPNGReader::SetRGB(int x, int y, byte r, byte g, byte b)
 185 {
 186   if (!Inside(x, y)) return FALSE;
 187
 188   if (ColorType & COLORTYPE_PALETTE)
 189   {
 190    if (!m_palette) return FALSE;
 191    SetIndex(x, y, m_palette->GetPixel(r, g, b));
 192
 193   } else {
 194    ImagePointerType ImagePointer = RawImage + EfeWidth*y + (x*Depth >> 3);
 195    ImagePointer[0] = b;
 196    ImagePointer[1] = g;
 197    ImagePointer[2] = r;
 198   }
 199
 200   return TRUE;
 201 }
 202
 203 bool wxPNGReader::SetPalette(wxPalette* colourmap)
 204 {
 205   delete m_palette ;
 206   if (!colourmap)
 207    return FALSE;
 208   ColorType |= (COLORTYPE_PALETTE | COLORTYPE_COLOR);
 209   m_palette = new wxPalette( *colourmap );
 210         return true ;
 211 //  return (DibSetUsage(lpbi, (HPALETTE) m_palette->GetHPALETTE(), WXIMA_COLORS ) != 0);
 212 }
 213
 214 bool
 215 wxPNGReader::SetPalette(int n, byte *r, byte *g, byte *b)
 216 {
 217   delete m_palette ;
 218   m_palette = new wxPalette();
 219   if (!m_palette)
 220    return FALSE;
 221
 222   if (!g) g = r;
 223   if (!b) b = g;
 224   m_palette->Create(n, r, g, b);
 225   ColorType |= (COLORTYPE_PALETTE | COLORTYPE_COLOR);
 226         return true ;
 227 //    return (DibSetUsage(lpbi, (HPALETTE) m_palette->GetHPALETTE(), WXIMA_COLORS ) != 0);
 228 }
 229
 230 bool
 231 wxPNGReader::SetPalette(int n, rgb_color_struct *rgb_struct)
 232 {
 233   delete m_palette ;
 234   m_palette = new wxPalette();
 235   if (!m_palette)
 236    return FALSE;
 237
 238   byte r[256], g[256], b[256];
 239
 240   for(int i=0; i<n; i++)
 241   {
 242    r[i] = rgb_struct[i].red;
 243    g[i] = rgb_struct[i].green;
 244    b[i] = rgb_struct[i].blue;
 245   }
 246   // Added by JACS copying from Andrew Davison's additions
 247   // to GIF-reading code
 248   // Make transparency colour black...
 249   if (bgindex != -1)
 250     r[bgindex] = g[bgindex] = b[bgindex] = 0;
 251
 252   m_palette->Create(n, r, g, b);
 253   ColorType |= (COLORTYPE_PALETTE | COLORTYPE_COLOR);
 254         return true ;
 255 //    return (DibSetUsage(lpbi, (HPALETTE) m_palette->GetHPALETTE(), WXIMA_COLORS ) != 0);
 256 }
 257
 258 void wxPNGReader::NullData()
 259 {
 260   if (lpbi)  {
 261         wxMacDestroyGWorld( lpbi ) ;
 262   }
 263   delete m_palette;
 264   lpbi = NULL;
 265   m_palette = NULL;
 266 }
 267
 268 wxBitmap* wxPNGReader::GetBitmap(void)
 269 {
 270     wxBitmap *bitmap = new wxBitmap;
 271     if ( InstantiateBitmap(bitmap) )
 272         return bitmap;
 273     else
 274     {
 275         delete bitmap;
 276         return NULL;
 277     }
 278 }
 279
 280 bool wxPNGReader::InstantiateBitmap(wxBitmap *bitmap)
 281 {
 282     if ( lpbi )
 283     {
 284       bitmap->SetHBITMAP((WXHBITMAP) lpbi);
 285       bitmap->SetWidth(GetWidth());
 286       bitmap->SetHeight(GetHeight());
 287       bitmap->SetDepth(GetDepth());
 288       if ( GetDepth() > 1 && m_palette )
 289         bitmap->SetPalette(*m_palette);
 290       bitmap->SetOk(TRUE);
 291
 292
 293       // Make a mask if appropriate
 294       /*
 295       if ( bgindex > -1 )
 296       {
 297         wxMask *mask = CreateMask();
 298         bitmap->SetMask(mask);
 299       }
 300       */
 301       lpbi = NULL ; // bitmap has taken over ownership
 302                 return TRUE;
 303     }
 304     else
 305     {
 306       return FALSE;
 307     }
 308 /*
 309   HDC dc = ::CreateCompatibleDC(NULL);
 310
 311   if (dc)
 312   {
 313         // tmpBitmap is a dummy, to satisfy ::CreateCompatibleDC (it
 314         // is a memory dc that must have a bitmap selected into it)
 315         HDC dc2 = GetDC(NULL);
 316         HBITMAP tmpBitmap = ::CreateCompatibleBitmap(dc2, GetWidth(), GetHeight());
 317         ReleaseDC(NULL, dc2);
 318         HBITMAP oldBitmap = (HBITMAP) ::SelectObject(dc, tmpBitmap);
 319
 320         if ( m_palette )
 321         {
 322             HPALETTE oldPal = ::SelectPalette(dc, (HPALETTE) m_palette->GetHPALETTE(), FALSE);
 323         ::RealizePalette(dc);
 324         }
 325
 326     HBITMAP hBitmap = ::CreateDIBitmap(dc, lpbi,
 327         CBM_INIT, RawImage, (LPBITMAPINFO) lpbi, DIB_PAL_COLORS);
 328
 329         ::SelectPalette(dc, NULL, TRUE);
 330         ::SelectObject(dc, oldBitmap);
 331         ::DeleteObject(tmpBitmap);
 332         ::DeleteDC(dc);
 333
 334         if ( hBitmap )
 335         {
 336           bitmap->SetHBITMAP((WXHBITMAP) hBitmap);
 337           bitmap->SetWidth(GetWidth());
 338           bitmap->SetHeight(GetHeight());
 339           bitmap->SetDepth(GetDepth());
 340           if ( GetDepth() > 1 && m_palette )
 341             bitmap->SetPalette(*m_palette);
 342           bitmap->SetOk(TRUE);
 343
 344
 345           // Make a mask if appropriate
 346           if ( bgindex > -1 )
 347           {
 348             wxMask *mask = CreateMask();
 349             bitmap->SetMask(mask);
 350           }
 351       return TRUE;
 352         }
 353         else
 354         {
 355           return FALSE;
 356         }
 357   }
 358   else
 359     {
 360     return FALSE;
 361     }
 362   */
 363   return false ;
 364 }
 365
 366 wxPalette *wxCopyPalette(const wxPalette *cmap)
 367 {
 368   wxPalette *newCmap = new wxPalette( *cmap ) ;
 369   return newCmap;
 370 }
 371
 372 wxMask *wxPNGReader::CreateMask(void)
 373 {
 374 /*
 375     HBITMAP hBitmap = ::CreateBitmap(GetWidth(), GetHeight(), 1, 1, NULL);
 376
 377   HDC dc = ::CreateCompatibleDC(NULL);
 378     HBITMAP oldBitmap = (HBITMAP) ::SelectObject(dc, hBitmap);
 379
 380     int bgIndex = GetBGIndex();
 381
 382     int x,y;
 383
 384     for (x=0; x<GetWidth(); x++)
 385     {
 386         for (y=0; y<GetHeight(); y++)
 387         {
 388             int index = GetIndex(x, y);
 389             if ( index == bgIndex )
 390                 ::SetPixel(dc, x, GetHeight() - y - 1, RGB(0, 0, 0));
 391             else
 392                 ::SetPixel(dc, x, GetHeight() - y - 1, RGB(255, 255, 255));
 393
 394       }
 395     }
 396     ::SelectObject(dc, oldBitmap);
 397     wxMask *mask = new wxMask;
 398     mask->SetMaskBitmap((WXHBITMAP) hBitmap);
 399     return mask;
 400    */
 401    return NULL ;
 402 }
 403
 404 bool wxPNGReader::ReadFile(char * ImageFileName)
 405 {
 406   int number_passes;
 407
 408   if (ImageFileName)
 409    strcpy(filename, ImageFileName);
 410
 411   FILE *fp;
 412   png_struct *png_ptr;
 413    png_info *info_ptr;
 414   wxPNGReaderIter iter(this);
 415
 416   /* open the file */
 417   fp = fopen( ImageFileName , "rb" );
 418
 419   if (!fp)
 420     return FALSE;
 421
 422   /* allocate the necessary structures */
 423   png_ptr = new (png_struct);
 424   if (!png_ptr)
 425   {
 426     fclose(fp);
 427     return FALSE;
 428   }
 429
 430   info_ptr = new (png_info);
 431   if (!info_ptr)
 432   {
 433     fclose(fp);
 434     delete(png_ptr);
 435     return FALSE;
 436   }
 437   /* set error handling */
 438   if (setjmp(png_ptr->jmpbuf))
 439   {
 440     png_read_destroy(png_ptr, info_ptr, (png_info *)0);
 441     fclose(fp);
 442     delete(png_ptr);
 443     delete(info_ptr);
 444
 445     /* If we get here, we had a problem reading the file */
 446     return FALSE;
 447   }
 448         //png_set_error(ima_png_error, NULL);
 449
 450   /* initialize the structures, info first for error handling */
 451   png_info_init(info_ptr);
 452   png_read_init(png_ptr);
 453
 454   /* set up the input control */
 455   png_init_io(png_ptr, fp);
 456
 457   /* read the file information */
 458   png_read_info(png_ptr, info_ptr);
 459
 460   /* allocate the memory to hold the image using the fields
 461     of png_info. */
 462   png_color_16 my_background={ 0, 31, 127, 255, 0 };
 463
 464   if (info_ptr->valid & PNG_INFO_bKGD)
 465     {
 466     png_set_background(png_ptr, &(info_ptr->background),
 467       PNG_BACKGROUND_GAMMA_FILE, 1, 1.0);
 468         if ( info_ptr->num_palette > 0 )
 469             bgindex = info_ptr->background.index;
 470     }
 471   else   {
 472     png_set_background(png_ptr, &my_background,
 473       PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0);
 474
 475         // Added by JACS: guesswork!
 476         if ( info_ptr->num_trans != 0 )
 477             bgindex = info_ptr->num_trans - 1 ;
 478    }
 479
 480   /* tell libpng to strip 16 bit depth files down to 8 bits */
 481   if (info_ptr->bit_depth == 16)
 482     png_set_strip_16(png_ptr);
 483
 484   int pixel_depth=(info_ptr->pixel_depth<24) ? info_ptr->pixel_depth: 24;
 485   Create(info_ptr->width, info_ptr->height, pixel_depth,
 486     info_ptr->color_type);
 487
 488   if (info_ptr->num_palette>0)
 489     {
 490       SetPalette((int)info_ptr->num_palette, (rgb_color_struct*)info_ptr->palette);
 491     }
 492
 493   int row_stride = info_ptr->width * ((pixel_depth+7)>>3);
 494  //  printf("P = %d D = %d RS= %d ", info_ptr->num_palette, info_ptr->pixel_depth,row_stride);
 495 //  printf("CT = %d TRS = %d BD= %d ", info_ptr->color_type, info_ptr->valid & PNG_INFO_tRNS,info_ptr->bit_depth);
 496
 497   byte *row_pointers = new byte[row_stride];
 498
 499   /* turn on interlace handling */
 500   if (info_ptr->interlace_type)
 501     number_passes = png_set_interlace_handling(png_ptr);
 502   else
 503     number_passes = 1;
 504 //  printf("NP = %d ", number_passes);
 505
 506   for (int pass=0; pass< number_passes; pass++)
 507   {
 508           iter.upset();
 509           int y=0;
 510                 CGrafPtr        origPort ;
 511                 GDHandle        origDevice ;
 512
 513                 GetGWorld( &origPort , &origDevice ) ;
 514                 // ignore shapedc
 515                 SetGWorld( lpbi , NULL ) ;
 516           do
 517           {
 518         //    (unsigned char *)iter.GetRow();
 519             if (info_ptr->interlace_type)
 520             {
 521              if (pass>0)
 522               iter.GetRow(row_pointers, row_stride);
 523              png_read_row(png_ptr, row_pointers, NULL);
 524             }
 525             else
 526              png_read_row(png_ptr, row_pointers, NULL);
 527
 528                         if ( info_ptr->palette )
 529                         {
 530                                 if ( pixel_depth == 8 )
 531                                 {
 532                                         for ( int i = 0 ; i < info_ptr->width ; ++i )
 533                                         {
 534                                                 png_color_struct* color ;
 535                                                 RGBColor col ;
 536
 537                                                 int index = row_pointers[i] ;
 538                                                 color = &info_ptr->palette[index] ;
 539                                                 col.red = (((int)color->red) << 8) | ((int)color->red) ;
 540                                                 col.green = (((int)color->green) << 8) | ((int)color->green) ;
 541                                                 col.blue = (((int)color->blue) << 8) | ((int)color->blue) ;
 542                                                 SetCPixel( i, y, &col);
 543                                         }
 544                                         /*
 545                                         png_color_struct* color ;
 546                                         RGBColor col ;
 547                                         unsigned char* p = &row_pointers[0] ;
 548                                         PenNormal() ;
 549                                         MoveTo( 0 , y ) ;
 550                                         int index = *p ;
 551                                         color = &info_ptr->palette[index] ;
 552                                         col.red = (color->red << 8) | color->red ;
 553                                         col.green = (color->green << 8) | color->green ;
 554                                         col.blue = (color->blue << 8) | color->blue ;
 555                                         RGBForeColor( &col ) ;
 556                                         col.red = col.green = col.blue = 0xFFFF ;
 557                                         RGBBackColor( &col ) ;
 558                                         for ( int i = 0 ; i < info_ptr->width ; ++i , ++p)
 559                                         {
 560                                                 if ( *p != index )
 561                                                 {
 562                                                         LineTo( i , y ) ;
 563                                                         index = *p ;
 564                                                         color = &info_ptr->palette[index] ;
 565                                                         col.red = (((int)color->red) << 8) | ((int)color->red) ;
 566                                                         col.green = (((int)color->green) << 8) | ((int)color->green) ;
 567                                                         col.blue = (((int)color->blue) << 8) | ((int)color->blue) ;
 568                                                         RGBForeColor( &col ) ;
 569                                                 }
 570                                         }
 571                                         LineTo( info_ptr->width  , y ) ;
 572                                         */
 573                                 }
 574                                 else
 575                                 {
 576                                         for ( int i = 0 ; i < info_ptr->width ; ++i )
 577                                         {
 578                                                 png_color_struct* color ;
 579                                                 RGBColor col ;
 580
 581                                                 int byte = ( i * pixel_depth ) / 8 ;
 582                                                 int offset = ( 8 - pixel_depth ) - ( i * pixel_depth ) % 8 ;
 583
 584                                                 int index = ( row_pointers[byte] >> offset ) & ( 0xFF >> ( 8 - pixel_depth ) );
 585                                                 color = &info_ptr->palette[index] ;
 586                                                 col.red = (((int)color->red) << 8) | ((int)color->red) ;
 587                                                 col.green = (((int)color->green) << 8) | ((int)color->green) ;
 588                                                 col.blue = (((int)color->blue) << 8) | ((int)color->blue) ;
 589                                                 SetCPixel( i, y, &col);
 590                                         }
 591                                 }
 592                         }
 593                         else
 594                         {
 595                                 for ( int i = 0 ; i < info_ptr->width ; ++i )
 596                                 {
 597                                         png_color_struct* color ;
 598                                         RGBColor col ;
 599                                         color =(png_color_struct*) (&row_pointers[i*3]) ;
 600                                         col.red = (((int)color->red) << 8) | ((int)color->red) ;
 601                                         col.green = (((int)color->green) << 8) | ((int)color->green) ;
 602                                         col.blue = (((int)color->blue) << 8) | ((int)color->blue) ;
 603                                         SetCPixel( i, y, &col);
 604                                 }
 605                         }
 606                         if (number_passes)
 607                                 iter.SetRow(row_pointers, row_stride);
 608             y++;
 609           }
 610           while(iter.PrevRow());
 611           SetGWorld( origPort , origDevice ) ;
 612
 613 //  printf("Y=%d ",y);
 614   }
 615   delete[] row_pointers;
 616
 617   /* read the rest of the file, getting any additional chunks
 618     in info_ptr */
 619   png_read_end(png_ptr, info_ptr);
 620
 621   /* clean up after the read, and free any memory allocated */
 622   png_read_destroy(png_ptr, info_ptr, (png_info *)0);
 623
 624   /* free the structures */
 625   delete(png_ptr);
 626   delete(info_ptr);
 627
 628   /* close the file */
 629   fclose(fp);
 630
 631   /* that's it */
 632   return TRUE;
 633 }
 634
 635
 636 /* write a png file */
 637
 638 bool wxPNGReader::SaveFile(char * ImageFileName)
 639 {
 640   if (ImageFileName)
 641    strcpy(filename, ImageFileName);
 642
 643   wxPNGReaderIter iter(this);
 644   FILE *fp;
 645    png_struct *png_ptr;
 646   png_info *info_ptr;
 647
 648    /* open the file */
 649   fp = fopen(filename, "wb");
 650   if (!fp)
 651     return FALSE;
 652
 653   /* allocate the necessary structures */
 654   png_ptr = new (png_struct);
 655   if (!png_ptr)
 656   {
 657     fclose(fp);
 658     return FALSE;
 659   }
 660
 661   info_ptr = new (png_info);
 662   if (!info_ptr)
 663   {
 664     fclose(fp);
 665     delete(png_ptr);
 666     return FALSE;
 667   }
 668
 669   /* set error handling */
 670   if (setjmp(png_ptr->jmpbuf))
 671   {
 672     png_write_destroy(png_ptr);
 673     fclose(fp);
 674     delete(png_ptr);
 675     delete(info_ptr);
 676
 677     /* If we get here, we had a problem reading the file */
 678     return FALSE;
 679   }
 680         //png_set_error(ima_png_error, NULL);
 681
 682 //  printf("writig pg %s ", filename);
 683    /* initialize the structures */
 684   png_info_init(info_ptr);
 685   png_write_init(png_ptr);
 686
 687   int row_stride = GetWidth() * ((GetDepth()+7)>>3);
 688   /* set up the output control */
 689    png_init_io(png_ptr, fp);
 690
 691   /* set the file information here */
 692   info_ptr->width = GetWidth();
 693   info_ptr->height = GetHeight();
 694   info_ptr->pixel_depth = GetDepth();
 695   info_ptr->channels = (GetDepth()>8) ? 3: 1;
 696   info_ptr->bit_depth = GetDepth()/info_ptr->channels;
 697   info_ptr->color_type = GetColorType();
 698   info_ptr->compression_type = info_ptr->filter_type = info_ptr->interlace_type=0;
 699   info_ptr->valid = 0;
 700   info_ptr->rowbytes = row_stride;
 701
 702
 703 // printf("P = %d D = %d RS= %d GD= %d CH= %d ", info_ptr->pixel_depth, info_ptr->bit_depth, row_stride, GetDepth(), info_ptr->channels);
 704   /* set the palette if there is one */
 705   if ((GetColorType() & COLORTYPE_PALETTE) && GetPalette())
 706   {
 707 //    printf("writing paleta[%d %d %x]",GetColorType() ,COLORTYPE_PALETTE, GetPalette());
 708     info_ptr->valid |= PNG_INFO_PLTE;
 709     info_ptr->palette = new png_color[256];
 710     info_ptr->num_palette = 256;
 711     for (int i=0; i<256; i++)
 712      GetPalette()->GetRGB(i, &info_ptr->palette[i].red, &info_ptr->palette[i].green, &info_ptr->palette[i].blue);
 713   }
 714 //    printf("Paleta [%d %d %x]",GetColorType() ,COLORTYPE_PALETTE, GetPalette());
 715
 716
 717    /* optional significant bit chunk */
 718 //   info_ptr->valid |= PNG_INFO_sBIT;
 719 //   info_ptr->sig_bit = true_bit_depth;
 720
 721   /* optional gamma chunk */
 722 //   info_ptr->valid |= PNG_INFO_gAMA;
 723 //   info_ptr->gamma = gamma;
 724
 725   /* other optional chunks */
 726
 727    /* write the file information */
 728    png_write_info(png_ptr, info_ptr);
 729
 730    /* set up the transformations you want.  Note that these are
 731       all optional.  Only call them if you want them */
 732
 733   /* shift the pixels up to a legal bit depth and fill in
 734       as appropriate to correctly scale the image */
 735 //   png_set_shift(png_ptr, &(info_ptr->sig_bit));
 736
 737   /* pack pixels into bytes */
 738 //   png_set_packing(png_ptr);
 739
 740   /* flip bgr pixels to rgb */
 741 //   png_set_bgr(png_ptr);
 742
 743    /* swap bytes of 16 bit files to most significant bit first */
 744 //   png_set_swap(png_ptr);
 745
 746    /* get rid of filler bytes, pack rgb into 3 bytes */
 747 //   png_set_rgbx(png_ptr);
 748
 749 /* If you are only writing one row at a time, this works */
 750
 751   byte *row_pointers = new byte[row_stride];
 752     iter.upset();
 753   do  {
 754 //    (unsigned char *)iter.GetRow();
 755     iter.GetRow(row_pointers, row_stride);
 756     png_write_row(png_ptr, row_pointers);
 757   } while(iter.PrevRow());
 758
 759         delete[] row_pointers;
 760
 761 /* write the rest of the file */
 762    png_write_end(png_ptr, info_ptr);
 763
 764   /* clean up after the write, and free any memory allocated */
 765    png_write_destroy(png_ptr);
 766
 767    /* if you malloced the palette, free it here */
 768    if (info_ptr->palette)
 769     delete[] (info_ptr->palette);
 770
 771   /* free the structures */
 772   delete(png_ptr);
 773   delete(info_ptr);
 774
 775   /* close the file */
 776   fclose(fp);
 777
 778   /* that's it */
 779   return TRUE;
 780 }
 781
 782 static int Power(int x, int y)
 783 {
 784     int z = 1;
 785     int i;
 786     for ( i = 0; i < y; i++)
 787     {
 788         z *= x;
 789     }
 790     return z;
 791 }
 792
 793 static char hexArray[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B',
 794   'C', 'D', 'E', 'F' };
 795
 796 static void DecToHex(int dec, char *buf)
 797 {
 798   int firstDigit = (int)(dec/16.0);
 799   int secondDigit = (int)(dec - (firstDigit*16.0));
 800   buf[0] = hexArray[firstDigit];
 801   buf[1] = hexArray[secondDigit];
 802   buf[2] = 0;
 803 }
 804
 805
 806 bool wxPNGReader::SaveXPM(char *filename, char *name)
 807 {
 808     char nameStr[256];
 809     if ( name )
 810         strcpy(nameStr, name);
 811     else
 812     {
 813         strcpy(nameStr, filename);
 814         wxStripExtension(nameStr);
 815     }
 816
 817     if ( GetDepth() > 4 )
 818     {
 819         // Only a depth of 4 and below allowed
 820         return FALSE;
 821     }
 822
 823     if ( !GetPalette() )
 824         return FALSE;
 825
 826     ofstream str(filename);
 827     if ( str.bad() )
 828         return FALSE;
 829
 830     int noColours = Power(2, GetDepth());
 831
 832     // Output header
 833     str << "/* XPM */\n";
 834     str << "static char * " << nameStr << "_xpm[] = {\n";
 835     str << "\"" << GetWidth() << " " << GetHeight() << " " << noColours << " 1\",\n";
 836
 837     // Output colourmap
 838     int base = 97 ; // start from 'a'
 839
 840     unsigned char red, green, blue;
 841     char hexBuf[4];
 842     int i;
 843     for ( i = 0; i < noColours; i ++)
 844     {
 845         str << "\"" << (char)(base + i) << "      c #";
 846         GetPalette()->GetRGB(i, &red, &green, &blue);
 847         DecToHex(red, hexBuf);
 848         str << hexBuf;
 849         DecToHex(green, hexBuf);
 850         str << hexBuf;
 851         DecToHex(blue, hexBuf);
 852         str << hexBuf;
 853         str << "\",\n";
 854     }
 855
 856     // Output the data
 857     int x, y;
 858     for ( y = 0; y < GetHeight(); y++)
 859     {
 860         str << "\"";
 861         for ( x = 0; x < GetWidth(); x++)
 862         {
 863             int index = GetIndex(x, y);
 864             str << (char)(base + index) ;
 865         }
 866         str << "\",\n";
 867     }
 868
 869     str << "};\n";
 870     str.flush();
 871
 872     return TRUE;
 873 }
 874
 875
 876 IMPLEMENT_DYNAMIC_CLASS(wxPNGFileHandler, wxBitmapHandler)
 877
 878 bool wxPNGFileHandler::LoadFile(wxBitmap *bitmap, const wxString& name, long flags,
 879     int desiredWidth, int desiredHeight)
 880 {
 881     wxPNGReader reader;
 882     if (reader.ReadFile((char*) (const char*) name))
 883     {
 884         return reader.InstantiateBitmap(bitmap);
 885     }
 886     else
 887         return FALSE;
 888 }
 889
 890 bool wxPNGFileHandler::SaveFile(wxBitmap *bitmap, const wxString& name, int type, const wxPalette *pal)
 891 {
 892     return FALSE;
 893 }
 894
 895