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   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 = 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   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 Palette;
 113   delete[] RawImage ;
 114   RawImage = 0;
 115   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 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 (Palette) {
 158    return Palette->GetRGB(GetIndex(x, y), r, g, b);
 159 /*   PALETTEENTRY entry;
 160    ::GetPaletteEntries((HPALETTE) 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 (!Palette) return FALSE;
 191    SetIndex(x, y, 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 Palette ;
 206   if (!colourmap)
 207    return FALSE;
 208   ColorType |= (COLORTYPE_PALETTE | COLORTYPE_COLOR);
 209   Palette = new wxPalette( *colourmap );
 210         return true ;
 211 //  return (DibSetUsage(lpbi, (HPALETTE) Palette->GetHPALETTE(), WXIMA_COLORS ) != 0);
 212 }
 213
 214 bool
 215 wxPNGReader::SetPalette(int n, byte *r, byte *g, byte *b)
 216 {
 217   delete Palette ;
 218   Palette = new wxPalette();
 219   if (!Palette)
 220    return FALSE;
 221
 222   if (!g) g = r;
 223   if (!b) b = g;
 224   Palette->Create(n, r, g, b);
 225   ColorType |= (COLORTYPE_PALETTE | COLORTYPE_COLOR);
 226         return true ;
 227 //    return (DibSetUsage(lpbi, (HPALETTE) Palette->GetHPALETTE(), WXIMA_COLORS ) != 0);
 228 }
 229
 230 bool
 231 wxPNGReader::SetPalette(int n, rgb_color_struct *rgb_struct)
 232 {
 233   delete Palette ;
 234   Palette = new wxPalette();
 235   if (!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   Palette->Create(n, r, g, b);
 253   ColorType |= (COLORTYPE_PALETTE | COLORTYPE_COLOR);
 254         return true ;
 255 //    return (DibSetUsage(lpbi, (HPALETTE) Palette->GetHPALETTE(), WXIMA_COLORS ) != 0);
 256 }
 257
 258 void wxPNGReader::NullData()
 259 {
 260   if (lpbi)  {
 261         wxMacDestroyGWorld( lpbi ) ;
 262   }
 263   delete Palette;
 264   lpbi = NULL;
 265   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 && Palette )
 289         bitmap->SetPalette(*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 ( Palette )
 321         {
 322             HPALETTE oldPal = ::SelectPalette(dc, (HPALETTE) 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 && Palette )
 341             bitmap->SetPalette(*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(wxUnix2MacFilename( ImageFileName ), "rb");
 418   if (!fp)
 419     return FALSE;
 420
 421   /* allocate the necessary structures */
 422   png_ptr = new (png_struct);
 423   if (!png_ptr)
 424   {
 425     fclose(fp);
 426     return FALSE;
 427   }
 428
 429   info_ptr = new (png_info);
 430   if (!info_ptr)
 431   {
 432     fclose(fp);
 433     delete(png_ptr);
 434     return FALSE;
 435   }
 436   /* set error handling */
 437   if (setjmp(png_ptr->jmpbuf))
 438   {
 439     png_read_destroy(png_ptr, info_ptr, (png_info *)0);
 440     fclose(fp);
 441     delete(png_ptr);
 442     delete(info_ptr);
 443
 444     /* If we get here, we had a problem reading the file */
 445     return FALSE;
 446   }
 447         //png_set_error(ima_png_error, NULL);
 448
 449   /* initialize the structures, info first for error handling */
 450   png_info_init(info_ptr);
 451   png_read_init(png_ptr);
 452
 453   /* set up the input control */
 454   png_init_io(png_ptr, fp);
 455
 456   /* read the file information */
 457   png_read_info(png_ptr, info_ptr);
 458
 459   /* allocate the memory to hold the image using the fields
 460     of png_info. */
 461   png_color_16 my_background={ 0, 31, 127, 255, 0 };
 462
 463   if (info_ptr->valid & PNG_INFO_bKGD)
 464     {
 465     png_set_background(png_ptr, &(info_ptr->background),
 466       PNG_BACKGROUND_GAMMA_FILE, 1, 1.0);
 467         if ( info_ptr->num_palette > 0 )
 468             bgindex = info_ptr->background.index;
 469     }
 470   else   {
 471     png_set_background(png_ptr, &my_background,
 472       PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0);
 473
 474         // Added by JACS: guesswork!
 475         if ( info_ptr->num_trans != 0 )
 476             bgindex = info_ptr->num_trans - 1 ;
 477    }
 478
 479   /* tell libpng to strip 16 bit depth files down to 8 bits */
 480   if (info_ptr->bit_depth == 16)
 481     png_set_strip_16(png_ptr);
 482
 483   int pixel_depth=(info_ptr->pixel_depth<24) ? info_ptr->pixel_depth: 24;
 484   Create(info_ptr->width, info_ptr->height, pixel_depth,
 485     info_ptr->color_type);
 486
 487   if (info_ptr->num_palette>0)
 488     {
 489       SetPalette((int)info_ptr->num_palette, (rgb_color_struct*)info_ptr->palette);
 490     }
 491
 492   int row_stride = info_ptr->width * ((pixel_depth+7)>>3);
 493  //  printf("P = %d D = %d RS= %d ", info_ptr->num_palette, info_ptr->pixel_depth,row_stride);
 494 //  printf("CT = %d TRS = %d BD= %d ", info_ptr->color_type, info_ptr->valid & PNG_INFO_tRNS,info_ptr->bit_depth);
 495
 496   byte *row_pointers = new byte[row_stride];
 497
 498   /* turn on interlace handling */
 499   if (info_ptr->interlace_type)
 500     number_passes = png_set_interlace_handling(png_ptr);
 501   else
 502     number_passes = 1;
 503 //  printf("NP = %d ", number_passes);
 504
 505   for (int pass=0; pass< number_passes; pass++)
 506   {
 507           iter.upset();
 508           int y=0;
 509                 CGrafPtr        origPort ;
 510                 GDHandle        origDevice ;
 511
 512                 GetGWorld( &origPort , &origDevice ) ;
 513                 // ignore shapedc
 514                 SetGWorld( lpbi , NULL ) ;
 515           do
 516           {
 517         //    (unsigned char *)iter.GetRow();
 518             if (info_ptr->interlace_type)
 519             {
 520              if (pass>0)
 521               iter.GetRow(row_pointers, row_stride);
 522              png_read_row(png_ptr, row_pointers, NULL);
 523             }
 524             else
 525              png_read_row(png_ptr, row_pointers, NULL);
 526
 527                         if ( info_ptr->palette )
 528                         {
 529                                 if ( pixel_depth == 8 )
 530                                 {
 531                                         for ( int i = 0 ; i < info_ptr->width ; ++i )
 532                                         {
 533                                                 png_color_struct* color ;
 534                                                 RGBColor col ;
 535
 536                                                 int index = row_pointers[i] ;
 537                                                 color = &info_ptr->palette[index] ;
 538                                                 col.red = (((int)color->red) << 8) | ((int)color->red) ;
 539                                                 col.green = (((int)color->green) << 8) | ((int)color->green) ;
 540                                                 col.blue = (((int)color->blue) << 8) | ((int)color->blue) ;
 541                                                 SetCPixel( i, y, &col);
 542                                         }
 543                                         /*
 544                                         png_color_struct* color ;
 545                                         RGBColor col ;
 546                                         unsigned char* p = &row_pointers[0] ;
 547                                         PenNormal() ;
 548                                         MoveTo( 0 , y ) ;
 549                                         int index = *p ;
 550                                         color = &info_ptr->palette[index] ;
 551                                         col.red = (color->red << 8) | color->red ;
 552                                         col.green = (color->green << 8) | color->green ;
 553                                         col.blue = (color->blue << 8) | color->blue ;
 554                                         RGBForeColor( &col ) ;
 555                                         col.red = col.green = col.blue = 0xFFFF ;
 556                                         RGBBackColor( &col ) ;
 557                                         for ( int i = 0 ; i < info_ptr->width ; ++i , ++p)
 558                                         {
 559                                                 if ( *p != index )
 560                                                 {
 561                                                         LineTo( i , y ) ;
 562                                                         index = *p ;
 563                                                         color = &info_ptr->palette[index] ;
 564                                                         col.red = (((int)color->red) << 8) | ((int)color->red) ;
 565                                                         col.green = (((int)color->green) << 8) | ((int)color->green) ;
 566                                                         col.blue = (((int)color->blue) << 8) | ((int)color->blue) ;
 567                                                         RGBForeColor( &col ) ;
 568                                                 }
 569                                         }
 570                                         LineTo( info_ptr->width  , y ) ;
 571                                         */
 572                                 }
 573                                 else
 574                                 {
 575                                         for ( int i = 0 ; i < info_ptr->width ; ++i )
 576                                         {
 577                                                 png_color_struct* color ;
 578                                                 RGBColor col ;
 579
 580                                                 int byte = ( i * pixel_depth ) / 8 ;
 581                                                 int offset = ( 8 - pixel_depth ) - ( i * pixel_depth ) % 8 ;
 582
 583                                                 int index = ( row_pointers[byte] >> offset ) & ( 0xFF >> ( 8 - pixel_depth ) );
 584                                                 color = &info_ptr->palette[index] ;
 585                                                 col.red = (((int)color->red) << 8) | ((int)color->red) ;
 586                                                 col.green = (((int)color->green) << 8) | ((int)color->green) ;
 587                                                 col.blue = (((int)color->blue) << 8) | ((int)color->blue) ;
 588                                                 SetCPixel( i, y, &col);
 589                                         }
 590                                 }
 591                         }
 592                         else
 593                         {
 594                                 for ( int i = 0 ; i < info_ptr->width ; ++i )
 595                                 {
 596                                         png_color_struct* color ;
 597                                         RGBColor col ;
 598                                         color =(png_color_struct*) (&row_pointers[i*3]) ;
 599                                         col.red = (((int)color->red) << 8) | ((int)color->red) ;
 600                                         col.green = (((int)color->green) << 8) | ((int)color->green) ;
 601                                         col.blue = (((int)color->blue) << 8) | ((int)color->blue) ;
 602                                         SetCPixel( i, y, &col);
 603                                 }
 604                         }
 605                         if (number_passes)
 606                                 iter.SetRow(row_pointers, row_stride);
 607             y++;
 608           }
 609           while(iter.PrevRow());
 610           SetGWorld( origPort , origDevice ) ;
 611
 612 //  printf("Y=%d ",y);
 613   }
 614   delete[] row_pointers;
 615
 616   /* read the rest of the file, getting any additional chunks
 617     in info_ptr */
 618   png_read_end(png_ptr, info_ptr);
 619
 620   /* clean up after the read, and free any memory allocated */
 621   png_read_destroy(png_ptr, info_ptr, (png_info *)0);
 622
 623   /* free the structures */
 624   delete(png_ptr);
 625   delete(info_ptr);
 626
 627   /* close the file */
 628   fclose(fp);
 629
 630   /* that's it */
 631   return TRUE;
 632 }
 633
 634
 635 /* write a png file */
 636
 637 bool wxPNGReader::SaveFile(char * ImageFileName)
 638 {
 639   if (ImageFileName)
 640    strcpy(filename, ImageFileName);
 641
 642   wxPNGReaderIter iter(this);
 643   FILE *fp;
 644    png_struct *png_ptr;
 645   png_info *info_ptr;
 646
 647    /* open the file */
 648   fp = fopen(filename, "wb");
 649   if (!fp)
 650     return FALSE;
 651
 652   /* allocate the necessary structures */
 653   png_ptr = new (png_struct);
 654   if (!png_ptr)
 655   {
 656     fclose(fp);
 657     return FALSE;
 658   }
 659
 660   info_ptr = new (png_info);
 661   if (!info_ptr)
 662   {
 663     fclose(fp);
 664     delete(png_ptr);
 665     return FALSE;
 666   }
 667
 668   /* set error handling */
 669   if (setjmp(png_ptr->jmpbuf))
 670   {
 671     png_write_destroy(png_ptr);
 672     fclose(fp);
 673     delete(png_ptr);
 674     delete(info_ptr);
 675
 676     /* If we get here, we had a problem reading the file */
 677     return FALSE;
 678   }
 679         //png_set_error(ima_png_error, NULL);
 680
 681 //  printf("writig pg %s ", filename);
 682    /* initialize the structures */
 683   png_info_init(info_ptr);
 684   png_write_init(png_ptr);
 685
 686   int row_stride = GetWidth() * ((GetDepth()+7)>>3);
 687   /* set up the output control */
 688    png_init_io(png_ptr, fp);
 689
 690   /* set the file information here */
 691   info_ptr->width = GetWidth();
 692   info_ptr->height = GetHeight();
 693   info_ptr->pixel_depth = GetDepth();
 694   info_ptr->channels = (GetDepth()>8) ? 3: 1;
 695   info_ptr->bit_depth = GetDepth()/info_ptr->channels;
 696   info_ptr->color_type = GetColorType();
 697   info_ptr->compression_type = info_ptr->filter_type = info_ptr->interlace_type=0;
 698   info_ptr->valid = 0;
 699   info_ptr->rowbytes = row_stride;
 700
 701
 702 // 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);
 703   /* set the palette if there is one */
 704   if ((GetColorType() & COLORTYPE_PALETTE) && GetPalette())
 705   {
 706 //    printf("writing paleta[%d %d %x]",GetColorType() ,COLORTYPE_PALETTE, GetPalette());
 707     info_ptr->valid |= PNG_INFO_PLTE;
 708     info_ptr->palette = new png_color[256];
 709     info_ptr->num_palette = 256;
 710     for (int i=0; i<256; i++)
 711      GetPalette()->GetRGB(i, &info_ptr->palette[i].red, &info_ptr->palette[i].green, &info_ptr->palette[i].blue);
 712   }
 713 //    printf("Paleta [%d %d %x]",GetColorType() ,COLORTYPE_PALETTE, GetPalette());
 714
 715
 716    /* optional significant bit chunk */
 717 //   info_ptr->valid |= PNG_INFO_sBIT;
 718 //   info_ptr->sig_bit = true_bit_depth;
 719
 720   /* optional gamma chunk */
 721 //   info_ptr->valid |= PNG_INFO_gAMA;
 722 //   info_ptr->gamma = gamma;
 723
 724   /* other optional chunks */
 725
 726    /* write the file information */
 727    png_write_info(png_ptr, info_ptr);
 728
 729    /* set up the transformations you want.  Note that these are
 730       all optional.  Only call them if you want them */
 731
 732   /* shift the pixels up to a legal bit depth and fill in
 733       as appropriate to correctly scale the image */
 734 //   png_set_shift(png_ptr, &(info_ptr->sig_bit));
 735
 736   /* pack pixels into bytes */
 737 //   png_set_packing(png_ptr);
 738
 739   /* flip bgr pixels to rgb */
 740 //   png_set_bgr(png_ptr);
 741
 742    /* swap bytes of 16 bit files to most significant bit first */
 743 //   png_set_swap(png_ptr);
 744
 745    /* get rid of filler bytes, pack rgb into 3 bytes */
 746 //   png_set_rgbx(png_ptr);
 747
 748 /* If you are only writing one row at a time, this works */
 749
 750   byte *row_pointers = new byte[row_stride];
 751     iter.upset();
 752   do  {
 753 //    (unsigned char *)iter.GetRow();
 754     iter.GetRow(row_pointers, row_stride);
 755     png_write_row(png_ptr, row_pointers);
 756   } while(iter.PrevRow());
 757
 758         delete[] row_pointers;
 759
 760 /* write the rest of the file */
 761    png_write_end(png_ptr, info_ptr);
 762
 763   /* clean up after the write, and free any memory allocated */
 764    png_write_destroy(png_ptr);
 765
 766    /* if you malloced the palette, free it here */
 767    if (info_ptr->palette)
 768     delete[] (info_ptr->palette);
 769
 770   /* free the structures */
 771   delete(png_ptr);
 772   delete(info_ptr);
 773
 774   /* close the file */
 775   fclose(fp);
 776
 777   /* that's it */
 778   return TRUE;
 779 }
 780
 781 static int Power(int x, int y)
 782 {
 783     int z = 1;
 784     int i;
 785     for ( i = 0; i < y; i++)
 786     {
 787         z *= x;
 788     }
 789     return z;
 790 }
 791
 792 static char hexArray[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B',
 793   'C', 'D', 'E', 'F' };
 794
 795 static void DecToHex(int dec, char *buf)
 796 {
 797   int firstDigit = (int)(dec/16.0);
 798   int secondDigit = (int)(dec - (firstDigit*16.0));
 799   buf[0] = hexArray[firstDigit];
 800   buf[1] = hexArray[secondDigit];
 801   buf[2] = 0;
 802 }
 803
 804
 805 bool wxPNGReader::SaveXPM(char *filename, char *name)
 806 {
 807     char nameStr[256];
 808     if ( name )
 809         strcpy(nameStr, name);
 810     else
 811     {
 812         strcpy(nameStr, filename);
 813         wxStripExtension(nameStr);
 814     }
 815
 816     if ( GetDepth() > 4 )
 817     {
 818         // Only a depth of 4 and below allowed
 819         return FALSE;
 820     }
 821
 822     if ( !GetPalette() )
 823         return FALSE;
 824
 825     ofstream str(filename);
 826     if ( str.bad() )
 827         return FALSE;
 828
 829     int noColours = Power(2, GetDepth());
 830
 831     // Output header
 832     str << "/* XPM */\n";
 833     str << "static char * " << nameStr << "_xpm[] = {\n";
 834     str << "\"" << GetWidth() << " " << GetHeight() << " " << noColours << " 1\",\n";
 835
 836     // Output colourmap
 837     int base = 97 ; // start from 'a'
 838
 839     unsigned char red, green, blue;
 840     char hexBuf[4];
 841     int i;
 842     for ( i = 0; i < noColours; i ++)
 843     {
 844         str << "\"" << (char)(base + i) << "      c #";
 845         GetPalette()->GetRGB(i, &red, &green, &blue);
 846         DecToHex(red, hexBuf);
 847         str << hexBuf;
 848         DecToHex(green, hexBuf);
 849         str << hexBuf;
 850         DecToHex(blue, hexBuf);
 851         str << hexBuf;
 852         str << "\",\n";
 853     }
 854
 855     // Output the data
 856     int x, y;
 857     for ( y = 0; y < GetHeight(); y++)
 858     {
 859         str << "\"";
 860         for ( x = 0; x < GetWidth(); x++)
 861         {
 862             int index = GetIndex(x, y);
 863             str << (char)(base + index) ;
 864         }
 865         str << "\",\n";
 866     }
 867
 868     str << "};\n";
 869     str.flush();
 870
 871     return TRUE;
 872 }
 873
 874
 875 IMPLEMENT_DYNAMIC_CLASS(wxPNGFileHandler, wxBitmapHandler)
 876
 877 bool wxPNGFileHandler::LoadFile(wxBitmap *bitmap, const wxString& name, long flags,
 878     int desiredWidth, int desiredHeight)
 879 {
 880     wxPNGReader reader;
 881     if (reader.ReadFile((char*) (const char*) name))
 882     {
 883         return reader.InstantiateBitmap(bitmap);
 884     }
 885     else
 886         return FALSE;
 887 }
 888
 889 bool wxPNGFileHandler::SaveFile(wxBitmap *bitmap, const wxString& name, int type, const wxPalette *pal)
 890 {
 891     return FALSE;
 892 }
 893
 894