src/os2/pnghand.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        pnghand.cpp
// Purpose:     Implements a PNG reader class + handler
// Author:      David Webster
// Modified by:
// Created:     10/10/99
// RCS-ID:      $Id$
// Copyright:   (c) David Webster
// Licence:     wxWindows license
/////////////////////////////////////////////////////////////////////////////

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#if wxUSE_IOSTREAMH
#   include <fstream.h>
#else
#   include <fstream>
#endif

#define INCL_DOS
#define INCL_PM
#define INCL_GPI
#include <os2.h>
#include "wx/palette.h"
#include "wx/bitmap.h"
#include "wx/utils.h"
#include "wx/os2/pngread.h"

extern "C" {
#include "../png/png.h"
}

extern "C" void png_read_init PNGARG((png_structp png_ptr));
extern "C" void png_write_init PNGARG((png_structp png_ptr));

#ifndef GlobalAllocPtr
#define     GlobalPtrHandle(lp)         \
                ((HGLOBAL)GlobalHandle(lp))

#define     GlobalLockPtr(lp)                \
                ((BOOL)GlobalLock(GlobalPtrHandle(lp)))
#define     GlobalUnlockPtr(lp)      \
                GlobalUnlock(GlobalPtrHandle(lp))

#define     GlobalAllocPtr(flags, cb)        \
                (GlobalLock(GlobalAlloc((flags), (cb))))
#define     GlobalReAllocPtr(lp, cbNew, flags)       \
                (GlobalUnlockPtr(lp), GlobalLock(GlobalReAlloc(GlobalPtrHandle(lp) , (cbNew), (flags))))
#define     GlobalFreePtr(lp)                \
                (GlobalUnlockPtr(lp), (BOOL)GlobalFree(GlobalPtrHandle(lp)))
#endif


void
ima_png_error(png_struct *png_ptr, char *message)
{
//        wxMessageBox(message, "PNG error");

  longjmp(png_ptr->jmpbuf, 1);
}


// static wxGifReaderIter* iter;
wxPalette *wxCopyPalette(const wxPalette *cmap);

wxPNGReader::wxPNGReader()
{
  filetype = 0;
  RawImage = NULL;      //  Image data

  Width = 0; Height = 0;       //  Dimensions
  Depth = 0;           // (bits x pixel)
  ColorType = 0;        // Bit 1 = Palette used
                  // Bit 2 = Color used
                  // Bit 3 = Alpha used

  EfeWidth = 0;         // Efective Width

  lpbi = NULL;
  bgindex = -1;
  Palette = 0;
  imageOK = FALSE;
}

wxPNGReader::wxPNGReader ( wxChar* ImageFileName )
{
  imageOK = FALSE;
  filetype = 0;
  RawImage = NULL;      //  Image data

  Width = 0; Height = 0;       //  Dimensions
  Depth = 0;           // (bits x pixel)
  ColorType = 0;        // Bit 1 = Palette used
                  // Bit 2 = Color used
                  // Bit 3 = Alpha used

  EfeWidth = 0;         // Efective Width

  lpbi = NULL;
  bgindex = -1;
  Palette = 0;

  imageOK = ReadFile (ImageFileName);
}

void
wxPNGReader::Create(int width, int height, int depth, int colortype)
{
  Width = width; Height = height; Depth = depth;
  ColorType = (colortype>=0) ? colortype: ((Depth>8) ? COLORTYPE_COLOR: 0);

  if (lpbi)  {
//   GlobalFreePtr(lpbi);
//   delete Palette;
  }
  RawImage = 0;
  Palette = 0;
  lpbi = 0; // TODO: wxDibCreate(Depth, Width, Height);
  if (lpbi)  {
    RawImage = 0; //TODO: (ImagePointerType)wxDibPtr(lpbi);
    EfeWidth = (long)(((long)Width*Depth + 31) / 32) * 4;
        imageOK = TRUE;
  }
}

wxPNGReader::~wxPNGReader ( )
{
  if (lpbi)  {
// TODO:   GlobalFreePtr(lpbi);
   delete Palette;
  }
}


int wxPNGReader::GetIndex(int x, int y)
{
  if (!Inside(x, y) || (Depth>8)) return -1;

  ImagePointerType ImagePointer = RawImage + EfeWidth*y + (x*Depth >> 3);
  int index = (int)(*ImagePointer);
  return index;
}

bool wxPNGReader::GetRGB(int x, int y, byte* r, byte* g, byte* b)
{
  if (!Inside(x, y)) return FALSE;

  if (Palette) {
   return Palette->GetRGB(GetIndex(x, y), r, g, b);
/*   PALETTEENTRY entry;
   ::GetPaletteEntries((HPALETTE) Palette->GetHPALETTE(), GetIndex(x, y), 1, &entry);
   *r = entry.peRed;
   *g = entry.peGreen;
   *b = entry.peBlue;  */
  } else {
   ImagePointerType ImagePointer = RawImage + EfeWidth*y + (x*Depth >> 3);
   *b = ImagePointer[0];
   *g = ImagePointer[1];
   *r = ImagePointer[2];
  }
  return TRUE;
}


bool wxPNGReader::SetIndex(int x, int y, int index)
{
  if (!Inside(x, y) || (Depth>8)) return FALSE;

  ImagePointerType ImagePointer = RawImage + EfeWidth*y + (x*Depth >> 3);
  *ImagePointer = index;

  return TRUE;
}

bool wxPNGReader::SetRGB(int x, int y, byte r, byte g, byte b)
{
  if (!Inside(x, y)) return FALSE;

  if (ColorType & COLORTYPE_PALETTE)
  {
   if (!Palette) return FALSE;
   SetIndex(x, y, Palette->GetPixel(r, g, b));

  } else {
   ImagePointerType ImagePointer = RawImage + EfeWidth*y + (x*Depth >> 3);
   ImagePointer[0] = b;
   ImagePointer[1] = g;
   ImagePointer[2] = r;
  }

  return TRUE;
}

bool wxPNGReader::SetPalette(wxPalette* colourmap)
{
  if (!colourmap)
   return FALSE;
  ColorType |= (COLORTYPE_PALETTE | COLORTYPE_COLOR);
  Palette = colourmap;
// TODO:  return (wxDibSetUsage(lpbi, (HPALETTE) Palette->GetHPALETTE(), WXIMA_COLORS ) != 0);
  return FALSE;
}

bool
wxPNGReader::SetPalette(int n, byte *r, byte *g, byte *b)
{
  Palette = new wxPalette();
  if (!Palette)
   return FALSE;

  if (!g) g = r;
  if (!b) b = g;
  Palette->Create(n, r, g, b);
  ColorType |= (COLORTYPE_PALETTE | COLORTYPE_COLOR);
// TODO:  return (wxDibSetUsage(lpbi, (HPALETTE) Palette->GetHPALETTE(), WXIMA_COLORS ) != 0);
  return FALSE;
}

bool
wxPNGReader::SetPalette(int n, rgb_color_struct *rgb_struct)
{
  Palette = new wxPalette();
  if (!Palette)
   return FALSE;

  byte r[256], g[256], b[256];

  for(int i=0; i<n; i++)
  {
   r[i] = rgb_struct[i].red;
   g[i] = rgb_struct[i].green;
   b[i] = rgb_struct[i].blue;
  }
  // Added by JACS copying from Andrew Davison's additions
  // to GIF-reading code
  // Make transparency colour black...
  if (bgindex != -1)
    r[bgindex] = g[bgindex] = b[bgindex] = 0;

  Palette->Create(n, r, g, b);
  ColorType |= (COLORTYPE_PALETTE | COLORTYPE_COLOR);
// TODO:  return (wxDibSetUsage(lpbi, (HPALETTE) Palette->GetHPALETTE(), WXIMA_COLORS ) != 0);
  return FALSE;
}

void wxPNGReader::NullData()
{
  lpbi = NULL;
  Palette = NULL;
}

wxBitmap* wxPNGReader::GetBitmap()
{
    wxBitmap *bitmap = new wxBitmap;
    if ( InstantiateBitmap(bitmap) )
        return bitmap;
    else
    {
        delete bitmap;
        return NULL;
    }
}

bool wxPNGReader::InstantiateBitmap(wxBitmap *bitmap)
{
// TODO:
/*
  HDC dc = ::CreateCompatibleDC(NULL);

  if (dc)
  {
        // tmpBitmap is a dummy, to satisfy ::CreateCompatibleDC (it
        // is a memory dc that must have a bitmap selected into it)
        HDC dc2 = GetDC(NULL);
        HBITMAP tmpBitmap = ::CreateCompatibleBitmap(dc2, GetWidth(), GetHeight());
        ReleaseDC(NULL, dc2);
        HBITMAP oldBitmap = (HBITMAP) ::SelectObject(dc, tmpBitmap);

        if ( Palette )
        {
            ::SelectPalette(dc, (HPALETTE) Palette->GetHPALETTE(), FALSE);
        ::RealizePalette(dc);
        }

    HBITMAP hBitmap = ::CreateDIBitmap(dc, lpbi,
        CBM_INIT, RawImage, (LPBITMAPINFO) lpbi, DIB_PAL_COLORS);

        ::SelectPalette(dc, NULL, TRUE);
        ::SelectObject(dc, oldBitmap);
        ::DeleteObject(tmpBitmap);
        ::DeleteDC(dc);

        if ( hBitmap )
        {
          bitmap->SetHBITMAP((WXHBITMAP) hBitmap);
          bitmap->SetWidth(GetWidth());
          bitmap->SetHeight(GetHeight());
          bitmap->SetDepth(GetDepth());
          if ( GetDepth() > 1 && Palette )
            bitmap->SetPalette(*Palette);
          bitmap->SetOk(TRUE);


          // Make a mask if appropriate
          if ( bgindex > -1 )
          {
            wxMask *mask = CreateMask();
            bitmap->SetMask(mask);
          }
      return TRUE;
        }
        else
        {
          return FALSE;
        }
  }
  else
    {
    return FALSE;
    }
*/
  return FALSE;
}

wxPalette *wxCopyPalette(const wxPalette *cmap)
{
  // To get number of entries...
  WORD count = 0;
// TODO:  ::GetObject((HPALETTE) cmap->GetHPALETTE(), sizeof(WORD), &count);
// TODO:
/*
  LOGPALETTE* logPal = (LOGPALETTE*)
     new BYTE[sizeof(LOGPALETTE) + count*sizeof(PALETTEENTRY)];
  logPal->palVersion = 0x300;
  logPal->palNumEntries = count;
  ::GetPaletteEntries((HPALETTE) cmap->GetHPALETTE(), 0, count, logPal->palPalEntry);

  HPALETTE hPalette = ::CreatePalette(logPal);
  delete[] logPal;
*/
  wxPalette *newCmap = new wxPalette;
// TODO:  newCmap->SetHPALETTE((WXHPALETTE) hPalette);
  return newCmap;
}

wxMask *wxPNGReader::CreateMask()
{
// TODO:
/*
    HBITMAP hBitmap = ::CreateBitmap(GetWidth(), GetHeight(), 1, 1, NULL);

  HDC dc = ::CreateCompatibleDC(NULL);
    HBITMAP oldBitmap = (HBITMAP) ::SelectObject(dc, hBitmap);

    int bgIndex = GetBGIndex();

    int x,y;

    for (x=0; x<GetWidth(); x++)
    {
        for (y=0; y<GetHeight(); y++)
        {
            int index = GetIndex(x, y);
            if ( index == bgIndex )
                ::SetPixel(dc, x, GetHeight() - y - 1, RGB(0, 0, 0));
            else
                ::SetPixel(dc, x, GetHeight() - y - 1, RGB(255, 255, 255));

      }
    }
    ::SelectObject(dc, oldBitmap);
*/
    wxMask *mask = new wxMask;
// TODO:    mask->SetMaskBitmap((WXHBITMAP) hBitmap);
    return mask;
}

bool wxPNGReader::ReadFile(wxChar * ImageFileName)
{
    if (ImageFileName)
        wxStrcpy(filename, ImageFileName);

    /* open the file */
    FILE *fp = fopen(wxConvFile.cWX2MB(filename), "rb");
    if (!fp)
        return FALSE;

    /* allocate the necessary structures */
    png_struct *png_ptr = new (png_struct);
    if (!png_ptr)
    {
        fclose(fp);
        return FALSE;
    }

    png_info *info_ptr = new (png_info);
    if (!info_ptr)
    {
        fclose(fp);
        delete(png_ptr);
        return FALSE;
    }

    /* set error handling */
    if (setjmp(png_ptr->jmpbuf))
    {
        png_read_destroy(png_ptr, info_ptr, (png_info *)0);
        fclose(fp);
        delete(png_ptr);
        delete(info_ptr);

        /* If we get here, we had a problem reading the file */
        return FALSE;
    }
    //png_set_error(ima_png_error, NULL);

    /* initialize the structures, info first for error handling */
    png_info_init(info_ptr);
    png_read_init(png_ptr);

    /* set up the input control */
    png_init_io(png_ptr, fp);

    /* read the file information */
    png_read_info(png_ptr, info_ptr);

    /* allocate the memory to hold the image using the fields
       of png_info. */
    png_color_16 my_background={ 0, 31, 127, 255, 0 };

    if (info_ptr->valid & PNG_INFO_bKGD)
    {
        png_set_background(png_ptr, &(info_ptr->background),
                PNG_BACKGROUND_GAMMA_FILE, 1, 1.0);
        if ( info_ptr->num_palette > 0 )
            bgindex = info_ptr->background.index;
    }
    else   {
        png_set_background(png_ptr, &my_background,
                PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0);

        // Added by JACS: guesswork!
        if ( info_ptr->num_trans != 0 )
            bgindex = info_ptr->num_trans - 1 ;
    }

    /* tell libpng to strip 16 bit depth files down to 8 bits */
    if (info_ptr->bit_depth == 16)
        png_set_strip_16(png_ptr);

    int pixel_depth=(info_ptr->pixel_depth<24) ? info_ptr->pixel_depth: 24;
    Create(info_ptr->width, info_ptr->height, pixel_depth,
            info_ptr->color_type);

    if (info_ptr->num_palette>0)
    {
        SetPalette((int)info_ptr->num_palette, (rgb_color_struct*)info_ptr->palette);
    }

    int row_stride = info_ptr->width * ((pixel_depth+7)>>3);
    //  printf("P = %d D = %d RS= %d ", info_ptr->num_palette, info_ptr->pixel_depth,row_stride);
    //  printf("CT = %d TRS = %d BD= %d ", info_ptr->color_type, info_ptr->valid & PNG_INFO_tRNS,info_ptr->bit_depth);

    byte *row_pointers = new byte[row_stride];

    /* turn on interlace handling */
    int number_passes;
    if (info_ptr->interlace_type)
        number_passes = png_set_interlace_handling(png_ptr);
    else
        number_passes = 1;
    //  printf("NP = %d ", number_passes);

    // don't use the object to prevent warnings from VC++ about "unportable
    // interaction between setjmp and C++ object destruction" (this is a correct
    // warning, of course!)
    wxPNGReaderIter *iter = new wxPNGReaderIter(this);
    for (int pass=0; pass< number_passes; pass++)
    {
        iter->upset();
        int y=0;
        do  {
            //(unsigned char *)iter.GetRow();
            if (info_ptr->interlace_type)  {
                if (pass>0)
                    iter->GetRow(row_pointers, row_stride);
                png_read_row(png_ptr, row_pointers, NULL);
            }
            else
                png_read_row(png_ptr, row_pointers, NULL);

            iter->SetRow(row_pointers, row_stride);
            y++;
        } while(iter->PrevRow());
        //  printf("Y=%d ",y);
    }

    delete iter;
    delete[] row_pointers;

    /* read the rest of the file, getting any additional chunks
       in info_ptr */
    png_read_end(png_ptr, info_ptr);

    /* clean up after the read, and free any memory allocated */
    png_read_destroy(png_ptr, info_ptr, (png_info *)0);

    /* free the structures */
    delete(png_ptr);
    delete(info_ptr);

    /* close the file */
    fclose(fp);

    /* that's it */
    return TRUE;
}


/* write a png file */

bool wxPNGReader::SaveFile(wxChar * ImageFileName)
{
  if (ImageFileName)
   wxStrcpy(filename, ImageFileName);

  wxPNGReaderIter iter(this);
  FILE *fp;
   png_struct *png_ptr;
  png_info *info_ptr;

   /* open the file */
  fp = fopen(wxConvFile.cWX2MB(filename), "wb");
  if (!fp)
    return FALSE;

  /* allocate the necessary structures */
  png_ptr = new (png_struct);
  if (!png_ptr)
  {
    fclose(fp);
    return FALSE;
  }

  info_ptr = new (png_info);
  if (!info_ptr)
  {
    fclose(fp);
    delete(png_ptr);
    return FALSE;
  }

  /* set error handling */
  if (setjmp(png_ptr->jmpbuf))
  {
    png_write_destroy(png_ptr);
    fclose(fp);
    delete(png_ptr);
    delete(info_ptr);

    /* If we get here, we had a problem reading the file */
    return FALSE;
  }
        //png_set_error(ima_png_error, NULL);

//  printf("writig pg %s ", filename);
   /* initialize the structures */
  png_info_init(info_ptr);
  png_write_init(png_ptr);

  int row_stride = GetWidth() * ((GetDepth()+7)>>3);
  /* set up the output control */
   png_init_io(png_ptr, fp);

  /* set the file information here */
  info_ptr->width = GetWidth();
  info_ptr->height = GetHeight();
  info_ptr->pixel_depth = GetDepth();
  info_ptr->channels = (GetDepth()>8) ? 3: 1;
  info_ptr->bit_depth = GetDepth()/info_ptr->channels;
  info_ptr->color_type = GetColorType();
  info_ptr->compression_type = info_ptr->filter_type = info_ptr->interlace_type=0;
  info_ptr->valid = 0;
  info_ptr->rowbytes = row_stride;


// 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);
  /* set the palette if there is one */
  if ((GetColorType() & COLORTYPE_PALETTE) && GetPalette())
  {
//    printf("writing paleta[%d %d %x]",GetColorType() ,COLORTYPE_PALETTE, GetPalette());
    info_ptr->valid |= PNG_INFO_PLTE;
    info_ptr->palette = new png_color[256];
    info_ptr->num_palette = 256;
    for (int i=0; i<256; i++)
     GetPalette()->GetRGB(i, &info_ptr->palette[i].red, &info_ptr->palette[i].green, &info_ptr->palette[i].blue);
  }
//    printf("Paleta [%d %d %x]",GetColorType() ,COLORTYPE_PALETTE, GetPalette());


   /* optional significant bit chunk */
//   info_ptr->valid |= PNG_INFO_sBIT;
//   info_ptr->sig_bit = true_bit_depth;

  /* optional gamma chunk */
//   info_ptr->valid |= PNG_INFO_gAMA;
//   info_ptr->gamma = gamma;

  /* other optional chunks */

   /* write the file information */
   png_write_info(png_ptr, info_ptr);

   /* set up the transformations you want.  Note that these are
      all optional.  Only call them if you want them */

  /* shift the pixels up to a legal bit depth and fill in
      as appropriate to correctly scale the image */
//   png_set_shift(png_ptr, &(info_ptr->sig_bit));

  /* pack pixels into bytes */
//   png_set_packing(png_ptr);

  /* flip bgr pixels to rgb */
//   png_set_bgr(png_ptr);

   /* swap bytes of 16 bit files to most significant bit first */
//   png_set_swap(png_ptr);

   /* get rid of filler bytes, pack rgb into 3 bytes */
//   png_set_rgbx(png_ptr);

/* If you are only writing one row at a time, this works */

  byte *row_pointers = new byte[row_stride];
    iter.upset();
  do  {
//    (unsigned char *)iter.GetRow();
    iter.GetRow(row_pointers, row_stride);
    png_write_row(png_ptr, row_pointers);
  } while(iter.PrevRow());

        delete[] row_pointers;

/* write the rest of the file */
   png_write_end(png_ptr, info_ptr);

  /* clean up after the write, and free any memory allocated */
   png_write_destroy(png_ptr);

   /* if you malloced the palette, free it here */
   if (info_ptr->palette)
    delete[] (info_ptr->palette);

  /* free the structures */
  delete(png_ptr);
  delete(info_ptr);

  /* close the file */
  fclose(fp);

  /* that's it */
  return TRUE;
}

static int Power(int x, int y)
{
    int z = 1;
    int i;
    for ( i = 0; i < y; i++)
    {
        z *= x;
    }
    return z;
}

static char hexArray[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B',
  'C', 'D', 'E', 'F' };

static void DecToHex(int dec, char *buf)
{
  int firstDigit = (int)(dec/16.0);
  int secondDigit = (int)(dec - (firstDigit*16.0));
  buf[0] = hexArray[firstDigit];
  buf[1] = hexArray[secondDigit];
  buf[2] = 0;
}


bool wxPNGReader::SaveXPM(wxChar *filename, wxChar *name)
{
    wxChar nameStr[256];
    if ( name )
        wxStrcpy(nameStr, name);
    else
    {
        wxStrcpy(nameStr, filename);
        wxStripExtension(nameStr);
    }

    if ( GetDepth() > 4 )
    {
        // Only a depth of 4 and below allowed
        return FALSE;
    }

    if ( !GetPalette() )
        return FALSE;

    ofstream str(wxConvFile.cWX2MB(filename));
    if ( str.bad() )
        return FALSE;

    int noColours = Power(2, GetDepth());

    // Output header
    str << "/* XPM */\n";
    str << "static char * " << nameStr << "_xpm[] = {\n";
    str << "\"" << GetWidth() << " " << GetHeight() << " " << noColours << " 1\",\n";

    // Output colourmap
    int base = 97 ; // start from 'a'

    unsigned char red, green, blue;
    char hexBuf[4];
    int i;
    for ( i = 0; i < noColours; i ++)
    {
        str << "\"" << (char)(base + i) << "      c #";
        GetPalette()->GetRGB(i, &red, &green, &blue);
        DecToHex(red, hexBuf);
        str << hexBuf;
        DecToHex(green, hexBuf);
        str << hexBuf;
        DecToHex(blue, hexBuf);
        str << hexBuf;
        str << "\",\n";
    }

    // Output the data
    int x, y;
    for ( y = 0; y < GetHeight(); y++)
    {
        str << "\"";
        for ( x = 0; x < GetWidth(); x++)
        {
            int index = GetIndex(x, y);
            str << (char)(base + index) ;
        }
        str << "\",\n";
    }

    str << "};\n";
    str.flush();

    return TRUE;
}

#include <wx/os2/pnghand.h>

IMPLEMENT_DYNAMIC_CLASS(wxPNGFileHandler, wxBitmapHandler)

bool wxPNGFileHandler::LoadFile(wxBitmap *bitmap, const wxString& name, long flags,
    int desiredWidth, int desiredHeight)
{
    wxPNGReader reader;
    if (reader.ReadFile(WXSTRINGCAST name))
    {
        return reader.InstantiateBitmap(bitmap);
    }
    else
        return FALSE;
}

bool wxPNGFileHandler::SaveFile(wxBitmap *bitmap, const wxString& name, int type, const wxPalette *pal)
{
    return FALSE;
}
Commit	Line	Data
	1	/////////////////////////////////////////////////////////////////////////////
	2	// Name: pnghand.cpp
	3	// Purpose: Implements a PNG reader class + handler
	4	// Author: David Webster
	5	// Modified by:
	6	// Created: 10/10/99
	7	// RCS-ID: $Id$
	8	// Copyright: (c) David Webster
	9	// Licence: wxWindows license
	10	/////////////////////////////////////////////////////////////////////////////
	11
	12	// For compilers that support precompilation, includes "wx.h".
	13	#include "wx/wxprec.h"
	14
	15	#include <stdlib.h>
	16	#include <stdio.h>
	17	#include <string.h>
	18
	19	#if wxUSE_IOSTREAMH
	20	# include <fstream.h>
	21	#else
	22	# include <fstream>
	23	#endif
	24
	25	#define INCL_DOS
	26	#define INCL_PM
	27	#define INCL_GPI
	28	#include <os2.h>
	29	#include "wx/palette.h"
	30	#include "wx/bitmap.h"
	31	#include "wx/utils.h"
	32	#include "wx/os2/pngread.h"
	33
	34	extern "C" {
	35	#include "../png/png.h"
	36	}
	37
	38	extern "C" void png_read_init PNGARG((png_structp png_ptr));
	39	extern "C" void png_write_init PNGARG((png_structp png_ptr));
	40
	41	#ifndef GlobalAllocPtr
	42	#define GlobalPtrHandle(lp) \
	43	((HGLOBAL)GlobalHandle(lp))
	44
	45	#define GlobalLockPtr(lp) \
	46	((BOOL)GlobalLock(GlobalPtrHandle(lp)))
	47	#define GlobalUnlockPtr(lp) \
	48	GlobalUnlock(GlobalPtrHandle(lp))
	49
	50	#define GlobalAllocPtr(flags, cb) \
	51	(GlobalLock(GlobalAlloc((flags), (cb))))
	52	#define GlobalReAllocPtr(lp, cbNew, flags) \
	53	(GlobalUnlockPtr(lp), GlobalLock(GlobalReAlloc(GlobalPtrHandle(lp) , (cbNew), (flags))))
	54	#define GlobalFreePtr(lp) \
	55	(GlobalUnlockPtr(lp), (BOOL)GlobalFree(GlobalPtrHandle(lp)))
	56	#endif
	57
	58
	59	void
	60	ima_png_error(png_struct png_ptr, char message)
	61	{
	62	// wxMessageBox(message, "PNG error");
	63
	64	longjmp(png_ptr->jmpbuf, 1);
	65	}
	66
	67
	68	// static wxGifReaderIter* iter;
	69	wxPalette wxCopyPalette(const wxPalette cmap);
	70
	71	wxPNGReader::wxPNGReader()
	72	{
	73	filetype = 0;
	74	RawImage = NULL; // Image data
	75
	76	Width = 0; Height = 0; // Dimensions
	77	Depth = 0; // (bits x pixel)
	78	ColorType = 0; // Bit 1 = Palette used
	79	// Bit 2 = Color used
	80	// Bit 3 = Alpha used
	81
	82	EfeWidth = 0; // Efective Width
	83
	84	lpbi = NULL;
	85	bgindex = -1;
	86	Palette = 0;
	87	imageOK = FALSE;
	88	}
	89
	90	wxPNGReader::wxPNGReader ( wxChar* ImageFileName )
	91	{
	92	imageOK = FALSE;
	93	filetype = 0;
	94	RawImage = NULL; // Image data
	95
	96	Width = 0; Height = 0; // Dimensions
	97	Depth = 0; // (bits x pixel)
	98	ColorType = 0; // Bit 1 = Palette used
	99	// Bit 2 = Color used
	100	// Bit 3 = Alpha used
	101
	102	EfeWidth = 0; // Efective Width
	103
	104	lpbi = NULL;
	105	bgindex = -1;
	106	Palette = 0;
	107
	108	imageOK = ReadFile (ImageFileName);
	109	}
	110
	111	void
	112	wxPNGReader::Create(int width, int height, int depth, int colortype)
	113	{
	114	Width = width; Height = height; Depth = depth;
	115	ColorType = (colortype>=0) ? colortype: ((Depth>8) ? COLORTYPE_COLOR: 0);
	116
	117	if (lpbi) {
	118	// GlobalFreePtr(lpbi);
	119	// delete Palette;
	120	}
	121	RawImage = 0;
	122	Palette = 0;
	123	lpbi = 0; // TODO: wxDibCreate(Depth, Width, Height);
	124	if (lpbi) {
	125	RawImage = 0; //TODO: (ImagePointerType)wxDibPtr(lpbi);
	126	EfeWidth = (long)(((long)WidthDepth + 31) / 32) 4;
	127	imageOK = TRUE;
	128	}
	129	}
	130
	131	wxPNGReader::~wxPNGReader ( )
	132	{
	133	if (lpbi) {
	134	// TODO: GlobalFreePtr(lpbi);
	135	delete Palette;
	136	}
	137	}
	138
	139
	140	int wxPNGReader::GetIndex(int x, int y)
	141	{
	142	if (!Inside(x, y) \|\| (Depth>8)) return -1;
	143
	144	ImagePointerType ImagePointer = RawImage + EfeWidthy + (xDepth >> 3);
	145	int index = (int)(*ImagePointer);
	146	return index;
	147	}
	148
	149	bool wxPNGReader::GetRGB(int x, int y, byte* r, byte* g, byte* b)
	150	{
	151	if (!Inside(x, y)) return FALSE;
	152
	153	if (Palette) {
	154	return Palette->GetRGB(GetIndex(x, y), r, g, b);
	155	/* PALETTEENTRY entry;
	156	::GetPaletteEntries((HPALETTE) Palette->GetHPALETTE(), GetIndex(x, y), 1, &entry);
	157	*r = entry.peRed;
	158	*g = entry.peGreen;
	159	b = entry.peBlue; /
	160	} else {
	161	ImagePointerType ImagePointer = RawImage + EfeWidthy + (xDepth >> 3);
	162	*b = ImagePointer[0];
	163	*g = ImagePointer[1];
	164	*r = ImagePointer[2];
	165	}
	166	return TRUE;
	167	}
	168
	169
	170	bool wxPNGReader::SetIndex(int x, int y, int index)
	171	{
	172	if (!Inside(x, y) \|\| (Depth>8)) return FALSE;
	173
	174	ImagePointerType ImagePointer = RawImage + EfeWidthy + (xDepth >> 3);
	175	*ImagePointer = index;
	176
	177	return TRUE;
	178	}
	179
	180	bool wxPNGReader::SetRGB(int x, int y, byte r, byte g, byte b)
	181	{
	182	if (!Inside(x, y)) return FALSE;
	183
	184	if (ColorType & COLORTYPE_PALETTE)
	185	{
	186	if (!Palette) return FALSE;
	187	SetIndex(x, y, Palette->GetPixel(r, g, b));
	188
	189	} else {
	190	ImagePointerType ImagePointer = RawImage + EfeWidthy + (xDepth >> 3);
	191	ImagePointer[0] = b;
	192	ImagePointer[1] = g;
	193	ImagePointer[2] = r;
	194	}
	195
	196	return TRUE;
	197	}
	198
	199	bool wxPNGReader::SetPalette(wxPalette* colourmap)
	200	{
	201	if (!colourmap)
	202	return FALSE;
	203	ColorType \|= (COLORTYPE_PALETTE \| COLORTYPE_COLOR);
	204	Palette = colourmap;
	205	// TODO: return (wxDibSetUsage(lpbi, (HPALETTE) Palette->GetHPALETTE(), WXIMA_COLORS ) != 0);
	206	return FALSE;
	207	}
	208
	209	bool
	210	wxPNGReader::SetPalette(int n, byte r, byte g, byte *b)
	211	{
	212	Palette = new wxPalette();
	213	if (!Palette)
	214	return FALSE;
	215
	216	if (!g) g = r;
	217	if (!b) b = g;
	218	Palette->Create(n, r, g, b);
	219	ColorType \|= (COLORTYPE_PALETTE \| COLORTYPE_COLOR);
	220	// TODO: return (wxDibSetUsage(lpbi, (HPALETTE) Palette->GetHPALETTE(), WXIMA_COLORS ) != 0);
	221	return FALSE;
	222	}
	223
	224	bool
	225	wxPNGReader::SetPalette(int n, rgb_color_struct *rgb_struct)
	226	{
	227	Palette = new wxPalette();
	228	if (!Palette)
	229	return FALSE;
	230
	231	byte r[256], g[256], b[256];
	232
	233	for(int i=0; i<n; i++)
	234	{
	235	r[i] = rgb_struct[i].red;
	236	g[i] = rgb_struct[i].green;
	237	b[i] = rgb_struct[i].blue;
	238	}
	239	// Added by JACS copying from Andrew Davison's additions
	240	// to GIF-reading code
	241	// Make transparency colour black...
	242	if (bgindex != -1)
	243	r[bgindex] = g[bgindex] = b[bgindex] = 0;
	244
	245	Palette->Create(n, r, g, b);
	246	ColorType \|= (COLORTYPE_PALETTE \| COLORTYPE_COLOR);
	247	// TODO: return (wxDibSetUsage(lpbi, (HPALETTE) Palette->GetHPALETTE(), WXIMA_COLORS ) != 0);
	248	return FALSE;
	249	}
	250
	251	void wxPNGReader::NullData()
	252	{
	253	lpbi = NULL;
	254	Palette = NULL;
	255	}
	256
	257	wxBitmap* wxPNGReader::GetBitmap()
	258	{
	259	wxBitmap *bitmap = new wxBitmap;
	260	if ( InstantiateBitmap(bitmap) )
	261	return bitmap;
	262	else
	263	{
	264	delete bitmap;
	265	return NULL;
	266	}
	267	}
	268
	269	bool wxPNGReader::InstantiateBitmap(wxBitmap *bitmap)
	270	{
	271	// TODO:
	272	/*
	273	HDC dc = ::CreateCompatibleDC(NULL);
	274
	275	if (dc)
	276	{
	277	// tmpBitmap is a dummy, to satisfy ::CreateCompatibleDC (it
	278	// is a memory dc that must have a bitmap selected into it)
	279	HDC dc2 = GetDC(NULL);
	280	HBITMAP tmpBitmap = ::CreateCompatibleBitmap(dc2, GetWidth(), GetHeight());
	281	ReleaseDC(NULL, dc2);
	282	HBITMAP oldBitmap = (HBITMAP) ::SelectObject(dc, tmpBitmap);
	283
	284	if ( Palette )
	285	{
	286	::SelectPalette(dc, (HPALETTE) Palette->GetHPALETTE(), FALSE);
	287	::RealizePalette(dc);
	288	}
	289
	290	HBITMAP hBitmap = ::CreateDIBitmap(dc, lpbi,
	291	CBM_INIT, RawImage, (LPBITMAPINFO) lpbi, DIB_PAL_COLORS);
	292
	293	::SelectPalette(dc, NULL, TRUE);
	294	::SelectObject(dc, oldBitmap);
	295	::DeleteObject(tmpBitmap);
	296	::DeleteDC(dc);
	297
	298	if ( hBitmap )
	299	{
	300	bitmap->SetHBITMAP((WXHBITMAP) hBitmap);
	301	bitmap->SetWidth(GetWidth());
	302	bitmap->SetHeight(GetHeight());
	303	bitmap->SetDepth(GetDepth());
	304	if ( GetDepth() > 1 && Palette )
	305	bitmap->SetPalette(*Palette);
	306	bitmap->SetOk(TRUE);
	307
	308
	309	// Make a mask if appropriate
	310	if ( bgindex > -1 )
	311	{
	312	wxMask *mask = CreateMask();
	313	bitmap->SetMask(mask);
	314	}
	315	return TRUE;
	316	}
	317	else
	318	{
	319	return FALSE;
	320	}
	321	}
	322	else
	323	{
	324	return FALSE;
	325	}
	326	*/
	327	return FALSE;
	328	}
	329
	330	wxPalette wxCopyPalette(const wxPalette cmap)
	331	{
	332	// To get number of entries...
	333	WORD count = 0;
	334	// TODO: ::GetObject((HPALETTE) cmap->GetHPALETTE(), sizeof(WORD), &count);
	335	// TODO:
	336	/*
	337	LOGPALETTE* logPal = (LOGPALETTE*)
	338	new BYTE[sizeof(LOGPALETTE) + count*sizeof(PALETTEENTRY)];
	339	logPal->palVersion = 0x300;
	340	logPal->palNumEntries = count;
	341	::GetPaletteEntries((HPALETTE) cmap->GetHPALETTE(), 0, count, logPal->palPalEntry);
	342
	343	HPALETTE hPalette = ::CreatePalette(logPal);
	344	delete[] logPal;
	345	*/
	346	wxPalette *newCmap = new wxPalette;
	347	// TODO: newCmap->SetHPALETTE((WXHPALETTE) hPalette);
	348	return newCmap;
	349	}
	350
	351	wxMask *wxPNGReader::CreateMask()
	352	{
	353	// TODO:
	354	/*
	355	HBITMAP hBitmap = ::CreateBitmap(GetWidth(), GetHeight(), 1, 1, NULL);
	356
	357	HDC dc = ::CreateCompatibleDC(NULL);
	358	HBITMAP oldBitmap = (HBITMAP) ::SelectObject(dc, hBitmap);
	359
	360	int bgIndex = GetBGIndex();
	361
	362	int x,y;
	363
	364	for (x=0; x<GetWidth(); x++)
	365	{
	366	for (y=0; y<GetHeight(); y++)
	367	{
	368	int index = GetIndex(x, y);
	369	if ( index == bgIndex )
	370	::SetPixel(dc, x, GetHeight() - y - 1, RGB(0, 0, 0));
	371	else
	372	::SetPixel(dc, x, GetHeight() - y - 1, RGB(255, 255, 255));
	373
	374	}
	375	}
	376	::SelectObject(dc, oldBitmap);
	377	*/
	378	wxMask *mask = new wxMask;
	379	// TODO: mask->SetMaskBitmap((WXHBITMAP) hBitmap);
	380	return mask;
	381	}
	382
	383	bool wxPNGReader::ReadFile(wxChar * ImageFileName)
	384	{
	385	if (ImageFileName)
	386	wxStrcpy(filename, ImageFileName);
	387
	388	/* open the file */
	389	FILE *fp = fopen(wxConvFile.cWX2MB(filename), "rb");
	390	if (!fp)
	391	return FALSE;
	392
	393	/* allocate the necessary structures */
	394	png_struct *png_ptr = new (png_struct);
	395	if (!png_ptr)
	396	{
	397	fclose(fp);
	398	return FALSE;
	399	}
	400
	401	png_info *info_ptr = new (png_info);
	402	if (!info_ptr)
	403	{
	404	fclose(fp);
	405	delete(png_ptr);
	406	return FALSE;
	407	}
	408
	409	/* set error handling */
	410	if (setjmp(png_ptr->jmpbuf))
	411	{
	412	png_read_destroy(png_ptr, info_ptr, (png_info *)0);
	413	fclose(fp);
	414	delete(png_ptr);
	415	delete(info_ptr);
	416
	417	/* If we get here, we had a problem reading the file */
	418	return FALSE;
	419	}
	420	//png_set_error(ima_png_error, NULL);
	421
	422	/* initialize the structures, info first for error handling */
	423	png_info_init(info_ptr);
	424	png_read_init(png_ptr);
	425
	426	/* set up the input control */
	427	png_init_io(png_ptr, fp);
	428
	429	/* read the file information */
	430	png_read_info(png_ptr, info_ptr);
	431
	432	/* allocate the memory to hold the image using the fields
	433	of png_info. */
	434	png_color_16 my_background={ 0, 31, 127, 255, 0 };
	435
	436	if (info_ptr->valid & PNG_INFO_bKGD)
	437	{
	438	png_set_background(png_ptr, &(info_ptr->background),
	439	PNG_BACKGROUND_GAMMA_FILE, 1, 1.0);
	440	if ( info_ptr->num_palette > 0 )
	441	bgindex = info_ptr->background.index;
	442	}
	443	else {
	444	png_set_background(png_ptr, &my_background,
	445	PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0);
	446
	447	// Added by JACS: guesswork!
	448	if ( info_ptr->num_trans != 0 )
	449	bgindex = info_ptr->num_trans - 1 ;
	450	}
	451
	452	/* tell libpng to strip 16 bit depth files down to 8 bits */
	453	if (info_ptr->bit_depth == 16)
	454	png_set_strip_16(png_ptr);
	455
	456	int pixel_depth=(info_ptr->pixel_depth<24) ? info_ptr->pixel_depth: 24;
	457	Create(info_ptr->width, info_ptr->height, pixel_depth,
	458	info_ptr->color_type);
	459
	460	if (info_ptr->num_palette>0)
	461	{
	462	SetPalette((int)info_ptr->num_palette, (rgb_color_struct*)info_ptr->palette);
	463	}
	464
	465	int row_stride = info_ptr->width * ((pixel_depth+7)>>3);
	466	// printf("P = %d D = %d RS= %d ", info_ptr->num_palette, info_ptr->pixel_depth,row_stride);
	467	// printf("CT = %d TRS = %d BD= %d ", info_ptr->color_type, info_ptr->valid & PNG_INFO_tRNS,info_ptr->bit_depth);
	468
	469	byte *row_pointers = new byte[row_stride];
	470
	471	/* turn on interlace handling */
	472	int number_passes;
	473	if (info_ptr->interlace_type)
	474	number_passes = png_set_interlace_handling(png_ptr);
	475	else
	476	number_passes = 1;
	477	// printf("NP = %d ", number_passes);
	478
	479	// don't use the object to prevent warnings from VC++ about "unportable
	480	// interaction between setjmp and C++ object destruction" (this is a correct
	481	// warning, of course!)
	482	wxPNGReaderIter *iter = new wxPNGReaderIter(this);
	483	for (int pass=0; pass< number_passes; pass++)
	484	{
	485	iter->upset();
	486	int y=0;
	487	do {
	488	//(unsigned char *)iter.GetRow();
	489	if (info_ptr->interlace_type) {
	490	if (pass>0)
	491	iter->GetRow(row_pointers, row_stride);
	492	png_read_row(png_ptr, row_pointers, NULL);
	493	}
	494	else
	495	png_read_row(png_ptr, row_pointers, NULL);
	496
	497	iter->SetRow(row_pointers, row_stride);
	498	y++;
	499	} while(iter->PrevRow());
	500	// printf("Y=%d ",y);
	501	}
	502
	503	delete iter;
	504	delete[] row_pointers;
	505
	506	/* read the rest of the file, getting any additional chunks
	507	in info_ptr */
	508	png_read_end(png_ptr, info_ptr);
	509
	510	/* clean up after the read, and free any memory allocated */
	511	png_read_destroy(png_ptr, info_ptr, (png_info *)0);
	512
	513	/* free the structures */
	514	delete(png_ptr);
	515	delete(info_ptr);
	516
	517	/* close the file */
	518	fclose(fp);
	519
	520	/* that's it */
	521	return TRUE;
	522	}
	523
	524
	525	/* write a png file */
	526
	527	bool wxPNGReader::SaveFile(wxChar * ImageFileName)
	528	{
	529	if (ImageFileName)
	530	wxStrcpy(filename, ImageFileName);
	531
	532	wxPNGReaderIter iter(this);
	533	FILE *fp;
	534	png_struct *png_ptr;
	535	png_info *info_ptr;
	536
	537	/* open the file */
	538	fp = fopen(wxConvFile.cWX2MB(filename), "wb");
	539	if (!fp)
	540	return FALSE;
	541
	542	/* allocate the necessary structures */
	543	png_ptr = new (png_struct);
	544	if (!png_ptr)
	545	{
	546	fclose(fp);
	547	return FALSE;
	548	}
	549
	550	info_ptr = new (png_info);
	551	if (!info_ptr)
	552	{
	553	fclose(fp);
	554	delete(png_ptr);
	555	return FALSE;
	556	}
	557
	558	/* set error handling */
	559	if (setjmp(png_ptr->jmpbuf))
	560	{
	561	png_write_destroy(png_ptr);
	562	fclose(fp);
	563	delete(png_ptr);
	564	delete(info_ptr);
	565
	566	/* If we get here, we had a problem reading the file */
	567	return FALSE;
	568	}
	569	//png_set_error(ima_png_error, NULL);
	570
	571	// printf("writig pg %s ", filename);
	572	/* initialize the structures */
	573	png_info_init(info_ptr);
	574	png_write_init(png_ptr);
	575
	576	int row_stride = GetWidth() * ((GetDepth()+7)>>3);
	577	/* set up the output control */
	578	png_init_io(png_ptr, fp);
	579
	580	/* set the file information here */
	581	info_ptr->width = GetWidth();
	582	info_ptr->height = GetHeight();
	583	info_ptr->pixel_depth = GetDepth();
	584	info_ptr->channels = (GetDepth()>8) ? 3: 1;
	585	info_ptr->bit_depth = GetDepth()/info_ptr->channels;
	586	info_ptr->color_type = GetColorType();
	587	info_ptr->compression_type = info_ptr->filter_type = info_ptr->interlace_type=0;
	588	info_ptr->valid = 0;
	589	info_ptr->rowbytes = row_stride;
	590
	591
	592	// 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);
	593	/* set the palette if there is one */
	594	if ((GetColorType() & COLORTYPE_PALETTE) && GetPalette())
	595	{
	596	// printf("writing paleta[%d %d %x]",GetColorType() ,COLORTYPE_PALETTE, GetPalette());
	597	info_ptr->valid \|= PNG_INFO_PLTE;
	598	info_ptr->palette = new png_color[256];
	599	info_ptr->num_palette = 256;
	600	for (int i=0; i<256; i++)
	601	GetPalette()->GetRGB(i, &info_ptr->palette[i].red, &info_ptr->palette[i].green, &info_ptr->palette[i].blue);
	602	}
	603	// printf("Paleta [%d %d %x]",GetColorType() ,COLORTYPE_PALETTE, GetPalette());
	604
	605
	606	/* optional significant bit chunk */
	607	// info_ptr->valid \|= PNG_INFO_sBIT;
	608	// info_ptr->sig_bit = true_bit_depth;
	609
	610	/* optional gamma chunk */
	611	// info_ptr->valid \|= PNG_INFO_gAMA;
	612	// info_ptr->gamma = gamma;
	613
	614	/* other optional chunks */
	615
	616	/* write the file information */
	617	png_write_info(png_ptr, info_ptr);
	618
	619	/* set up the transformations you want. Note that these are
	620	all optional. Only call them if you want them */
	621
	622	/* shift the pixels up to a legal bit depth and fill in
	623	as appropriate to correctly scale the image */
	624	// png_set_shift(png_ptr, &(info_ptr->sig_bit));
	625
	626	/* pack pixels into bytes */
	627	// png_set_packing(png_ptr);
	628
	629	/* flip bgr pixels to rgb */
	630	// png_set_bgr(png_ptr);
	631
	632	/* swap bytes of 16 bit files to most significant bit first */
	633	// png_set_swap(png_ptr);
	634
	635	/* get rid of filler bytes, pack rgb into 3 bytes */
	636	// png_set_rgbx(png_ptr);
	637
	638	/* If you are only writing one row at a time, this works */
	639
	640	byte *row_pointers = new byte[row_stride];
	641	iter.upset();
	642	do {
	643	// (unsigned char *)iter.GetRow();
	644	iter.GetRow(row_pointers, row_stride);
	645	png_write_row(png_ptr, row_pointers);
	646	} while(iter.PrevRow());
	647
	648	delete[] row_pointers;
	649
	650	/* write the rest of the file */
	651	png_write_end(png_ptr, info_ptr);
	652
	653	/* clean up after the write, and free any memory allocated */
	654	png_write_destroy(png_ptr);
	655
	656	/* if you malloced the palette, free it here */
	657	if (info_ptr->palette)
	658	delete[] (info_ptr->palette);
	659
	660	/* free the structures */
	661	delete(png_ptr);
	662	delete(info_ptr);
	663
	664	/* close the file */
	665	fclose(fp);
	666
	667	/* that's it */
	668	return TRUE;
	669	}
	670
	671	static int Power(int x, int y)
	672	{
	673	int z = 1;
	674	int i;
	675	for ( i = 0; i < y; i++)
	676	{
	677	z *= x;
	678	}
	679	return z;
	680	}
	681
	682	static char hexArray[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B',
	683	'C', 'D', 'E', 'F' };
	684
	685	static void DecToHex(int dec, char *buf)
	686	{
	687	int firstDigit = (int)(dec/16.0);
	688	int secondDigit = (int)(dec - (firstDigit*16.0));
	689	buf[0] = hexArray[firstDigit];
	690	buf[1] = hexArray[secondDigit];
	691	buf[2] = 0;
	692	}
	693
	694
	695	bool wxPNGReader::SaveXPM(wxChar filename, wxChar name)
	696	{
	697	wxChar nameStr[256];
	698	if ( name )
	699	wxStrcpy(nameStr, name);
	700	else
	701	{
	702	wxStrcpy(nameStr, filename);
	703	wxStripExtension(nameStr);
	704	}
	705
	706	if ( GetDepth() > 4 )
	707	{
	708	// Only a depth of 4 and below allowed
	709	return FALSE;
	710	}
	711
	712	if ( !GetPalette() )
	713	return FALSE;
	714
	715	ofstream str(wxConvFile.cWX2MB(filename));
	716	if ( str.bad() )
	717	return FALSE;
	718
	719	int noColours = Power(2, GetDepth());
	720
	721	// Output header
	722	str << "/* XPM */\n";
	723	str << "static char * " << nameStr << "_xpm[] = {\n";
	724	str << "\"" << GetWidth() << " " << GetHeight() << " " << noColours << " 1\",\n";
	725
	726	// Output colourmap
	727	int base = 97 ; // start from 'a'
	728
	729	unsigned char red, green, blue;
	730	char hexBuf[4];
	731	int i;
	732	for ( i = 0; i < noColours; i ++)
	733	{
	734	str << "\"" << (char)(base + i) << " c #";
	735	GetPalette()->GetRGB(i, &red, &green, &blue);
	736	DecToHex(red, hexBuf);
	737	str << hexBuf;
	738	DecToHex(green, hexBuf);
	739	str << hexBuf;
	740	DecToHex(blue, hexBuf);
	741	str << hexBuf;
	742	str << "\",\n";
	743	}
	744
	745	// Output the data
	746	int x, y;
	747	for ( y = 0; y < GetHeight(); y++)
	748	{
	749	str << "\"";
	750	for ( x = 0; x < GetWidth(); x++)
	751	{
	752	int index = GetIndex(x, y);
	753	str << (char)(base + index) ;
	754	}
	755	str << "\",\n";
	756	}
	757
	758	str << "};\n";
	759	str.flush();
	760
	761	return TRUE;
	762	}
	763
	764	#include <wx/os2/pnghand.h>
	765
	766	IMPLEMENT_DYNAMIC_CLASS(wxPNGFileHandler, wxBitmapHandler)
	767
	768	bool wxPNGFileHandler::LoadFile(wxBitmap *bitmap, const wxString& name, long flags,
	769	int desiredWidth, int desiredHeight)
	770	{
	771	wxPNGReader reader;
	772	if (reader.ReadFile(WXSTRINGCAST name))
	773	{
	774	return reader.InstantiateBitmap(bitmap);
	775	}
	776	else
	777	return FALSE;
	778	}
	779
	780	bool wxPNGFileHandler::SaveFile(wxBitmap bitmap, const wxString& name, int type, const wxPalette pal)
	781	{
	782	return FALSE;
	783	}
	784
	785