src/msw/pnghand.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        pnghand.cpp
// Purpose:     Implements a PNG reader class + handler
// Author:      Julian Smart
// Modified by:
// Created:     04/01/98
// RCS-ID:      $Id$
// Copyright:   (c) Julian Smart and Markus Holzem
// Licence:     wxWindows license
/////////////////////////////////////////////////////////////////////////////

#ifdef __GNUG__
#pragma implementation "pngread.h"
#pragma implementation "pnghand.h"
#endif

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

#ifdef __BORLANDC__
#pragma hdrstop
#endif

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

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

#include <windows.h>
#include <wx/palette.h>
#include <wx/bitmap.h>
#include <wx/msw/pngread.h>
#include <wx/msw/dibutils.h>

extern "C" {
#include "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(void)
{
  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 ( char* 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)  {
#ifdef __WIN16__
   GlobalFreePtr((unsigned int) lpbi);
#else
   GlobalFreePtr(lpbi);
#endif
//   delete Palette;
  }
  RawImage = 0;
  Palette = 0;
  if (lpbi = DibCreate(Depth, Width, Height))  {
    RawImage = (ImagePointerType)DibPtr(lpbi);
    EfeWidth = (long)(((long)Width*Depth + 31) / 32) * 4;
        imageOK = TRUE;
  }
}

wxPNGReader::~wxPNGReader ( )
{
  if (lpbi)  {
#ifdef __WIN16__
   GlobalFreePtr((unsigned int) lpbi);
#else
   GlobalFreePtr(lpbi);
#endif
   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;
  return (DibSetUsage(lpbi, (HPALETTE) Palette->GetHPALETTE(), WXIMA_COLORS ) != 0);
}

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);
  return (DibSetUsage(lpbi, (HPALETTE) Palette->GetHPALETTE(), WXIMA_COLORS ) != 0);
}

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);
  return (DibSetUsage(lpbi, (HPALETTE) Palette->GetHPALETTE(), WXIMA_COLORS ) != 0);
}

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

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

bool wxPNGReader::InstantiateBitmap(wxBitmap *bitmap)
{
  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 )
        {
            HPALETTE oldPal = ::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;
    }
}

wxPalette *wxCopyPalette(const wxPalette *cmap)
{
  // To get number of entries...
  WORD count = 0;
  ::GetObject((HPALETTE) cmap->GetHPALETTE(), sizeof(WORD), &count);

  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;
  newCmap->SetHPALETTE((WXHPALETTE) hPalette);
  return newCmap;
}

wxMask *wxPNGReader::CreateMask(void)
{
    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;
    mask->SetMaskBitmap((WXHBITMAP) hBitmap);
    return mask;
}

bool wxPNGReader::ReadFile(char * ImageFileName)
{
  int number_passes;

  if (ImageFileName)
   strcpy(filename, ImageFileName);

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

  /* open the file */
  fp = fopen(filename, "rb");
  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_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 */
  if (info_ptr->interlace_type)
    number_passes = png_set_interlace_handling(png_ptr);
  else
    number_passes = 1;
//  printf("NP = %d ", number_passes);

  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[] 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(char * ImageFileName)
{
  if (ImageFileName)
   strcpy(filename, ImageFileName);

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

   /* open the file */
  fp = fopen(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(char *filename, char *name)
{
    char nameStr[256];
    if ( name )
        strcpy(nameStr, name);
    else
    {
        strcpy(nameStr, filename);
        wxStripExtension(nameStr);
    }

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

    if ( !GetPalette() )
        return FALSE;

    ofstream str(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/msw/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((char*) (const char*) 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: 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	#include <windows.h>
	35	#include <wx/palette.h>
	36	#include <wx/bitmap.h>
	37	#include <wx/msw/pngread.h>
	38	#include <wx/msw/dibutils.h>
	39
	40	extern "C" {
	41	#include "png.h"
	42	}
	43
	44	extern "C" void png_read_init PNGARG((png_structp png_ptr));
	45	extern "C" void png_write_init PNGARG((png_structp png_ptr));
	46
	47	#ifndef GlobalAllocPtr
	48	#define GlobalPtrHandle(lp) \
	49	((HGLOBAL)GlobalHandle(lp))
	50
	51	#define GlobalLockPtr(lp) \
	52	((BOOL)GlobalLock(GlobalPtrHandle(lp)))
	53	#define GlobalUnlockPtr(lp) \
	54	GlobalUnlock(GlobalPtrHandle(lp))
	55
	56	#define GlobalAllocPtr(flags, cb) \
	57	(GlobalLock(GlobalAlloc((flags), (cb))))
	58	#define GlobalReAllocPtr(lp, cbNew, flags) \
	59	(GlobalUnlockPtr(lp), GlobalLock(GlobalReAlloc(GlobalPtrHandle(lp) , (cbNew), (flags))))
	60	#define GlobalFreePtr(lp) \
	61	(GlobalUnlockPtr(lp), (BOOL)GlobalFree(GlobalPtrHandle(lp)))
	62	#endif
	63
	64
	65	void
	66	ima_png_error(png_struct png_ptr, char message)
	67	{
	68	// wxMessageBox(message, "PNG error");
	69
	70	longjmp(png_ptr->jmpbuf, 1);
	71	}
	72
	73
	74	// static wxGifReaderIter* iter;
	75	wxPalette wxCopyPalette(const wxPalette cmap);
	76
	77	wxPNGReader::wxPNGReader(void)
	78	{
	79	filetype = 0;
	80	RawImage = NULL; // Image data
	81
	82	Width = 0; Height = 0; // Dimensions
	83	Depth = 0; // (bits x pixel)
	84	ColorType = 0; // Bit 1 = Palette used
	85	// Bit 2 = Color used
	86	// Bit 3 = Alpha used
	87
	88	EfeWidth = 0; // Efective Width
	89
	90	lpbi = NULL;
	91	bgindex = -1;
	92	Palette = 0;
	93	imageOK = FALSE;
	94	}
	95
	96	wxPNGReader::wxPNGReader ( char* ImageFileName )
	97	{
	98	imageOK = FALSE;
	99	filetype = 0;
	100	RawImage = NULL; // Image data
	101
	102	Width = 0; Height = 0; // Dimensions
	103	Depth = 0; // (bits x pixel)
	104	ColorType = 0; // Bit 1 = Palette used
	105	// Bit 2 = Color used
	106	// Bit 3 = Alpha used
	107
	108	EfeWidth = 0; // Efective Width
	109
	110	lpbi = NULL;
	111	bgindex = -1;
	112	Palette = 0;
	113
	114	imageOK = ReadFile (ImageFileName);
	115	}
	116
	117	void
	118	wxPNGReader::Create(int width, int height, int depth, int colortype)
	119	{
	120	Width = width; Height = height; Depth = depth;
	121	ColorType = (colortype>=0) ? colortype: ((Depth>8) ? COLORTYPE_COLOR: 0);
	122
	123	if (lpbi) {
	124	#ifdef __WIN16__
	125	GlobalFreePtr((unsigned int) lpbi);
	126	#else
	127	GlobalFreePtr(lpbi);
	128	#endif
	129	// delete Palette;
	130	}
	131	RawImage = 0;
	132	Palette = 0;
	133	if (lpbi = DibCreate(Depth, Width, Height)) {
	134	RawImage = (ImagePointerType)DibPtr(lpbi);
	135	EfeWidth = (long)(((long)WidthDepth + 31) / 32) 4;
	136	imageOK = TRUE;
	137	}
	138	}
	139
	140	wxPNGReader::~wxPNGReader ( )
	141	{
	142	if (lpbi) {
	143	#ifdef __WIN16__
	144	GlobalFreePtr((unsigned int) lpbi);
	145	#else
	146	GlobalFreePtr(lpbi);
	147	#endif
	148	delete Palette;
	149	}
	150	}
	151
	152
	153	int wxPNGReader::GetIndex(int x, int y)
	154	{
	155	if (!Inside(x, y) \|\| (Depth>8)) return -1;
	156
	157	ImagePointerType ImagePointer = RawImage + EfeWidthy + (xDepth >> 3);
	158	int index = (int)(*ImagePointer);
	159	return index;
	160	}
	161
	162	bool wxPNGReader::GetRGB(int x, int y, byte* r, byte* g, byte* b)
	163	{
	164	if (!Inside(x, y)) return FALSE;
	165
	166	if (Palette) {
	167	return Palette->GetRGB(GetIndex(x, y), r, g, b);
	168	/* PALETTEENTRY entry;
	169	::GetPaletteEntries((HPALETTE) Palette->GetHPALETTE(), GetIndex(x, y), 1, &entry);
	170	*r = entry.peRed;
	171	*g = entry.peGreen;
	172	b = entry.peBlue; /
	173	} else {
	174	ImagePointerType ImagePointer = RawImage + EfeWidthy + (xDepth >> 3);
	175	*b = ImagePointer[0];
	176	*g = ImagePointer[1];
	177	*r = ImagePointer[2];
	178	}
	179	return TRUE;
	180	}
	181
	182
	183	bool wxPNGReader::SetIndex(int x, int y, int index)
	184	{
	185	if (!Inside(x, y) \|\| (Depth>8)) return FALSE;
	186
	187	ImagePointerType ImagePointer = RawImage + EfeWidthy + (xDepth >> 3);
	188	*ImagePointer = index;
	189
	190	return TRUE;
	191	}
	192
	193	bool wxPNGReader::SetRGB(int x, int y, byte r, byte g, byte b)
	194	{
	195	if (!Inside(x, y)) return FALSE;
	196
	197	if (ColorType & COLORTYPE_PALETTE)
	198	{
	199	if (!Palette) return FALSE;
	200	SetIndex(x, y, Palette->GetPixel(r, g, b));
	201
	202	} else {
	203	ImagePointerType ImagePointer = RawImage + EfeWidthy + (xDepth >> 3);
	204	ImagePointer[0] = b;
	205	ImagePointer[1] = g;
	206	ImagePointer[2] = r;
	207	}
	208
	209	return TRUE;
	210	}
	211
	212	bool wxPNGReader::SetPalette(wxPalette* colourmap)
	213	{
	214	if (!colourmap)
	215	return FALSE;
	216	ColorType \|= (COLORTYPE_PALETTE \| COLORTYPE_COLOR);
	217	Palette = colourmap;
	218	return (DibSetUsage(lpbi, (HPALETTE) Palette->GetHPALETTE(), WXIMA_COLORS ) != 0);
	219	}
	220
	221	bool
	222	wxPNGReader::SetPalette(int n, byte r, byte g, byte *b)
	223	{
	224	Palette = new wxPalette();
	225	if (!Palette)
	226	return FALSE;
	227
	228	if (!g) g = r;
	229	if (!b) b = g;
	230	Palette->Create(n, r, g, b);
	231	ColorType \|= (COLORTYPE_PALETTE \| COLORTYPE_COLOR);
	232	return (DibSetUsage(lpbi, (HPALETTE) Palette->GetHPALETTE(), WXIMA_COLORS ) != 0);
	233	}
	234
	235	bool
	236	wxPNGReader::SetPalette(int n, rgb_color_struct *rgb_struct)
	237	{
	238	Palette = new wxPalette();
	239	if (!Palette)
	240	return FALSE;
	241
	242	byte r[256], g[256], b[256];
	243
	244	for(int i=0; i<n; i++)
	245	{
	246	r[i] = rgb_struct[i].red;
	247	g[i] = rgb_struct[i].green;
	248	b[i] = rgb_struct[i].blue;
	249	}
	250	// Added by JACS copying from Andrew Davison's additions
	251	// to GIF-reading code
	252	// Make transparency colour black...
	253	if (bgindex != -1)
	254	r[bgindex] = g[bgindex] = b[bgindex] = 0;
	255
	256	Palette->Create(n, r, g, b);
	257	ColorType \|= (COLORTYPE_PALETTE \| COLORTYPE_COLOR);
	258	return (DibSetUsage(lpbi, (HPALETTE) Palette->GetHPALETTE(), WXIMA_COLORS ) != 0);
	259	}
	260
	261	void wxPNGReader::NullData()
	262	{
	263	lpbi = NULL;
	264	Palette = NULL;
	265	}
	266
	267	wxBitmap* wxPNGReader::GetBitmap(void)
	268	{
	269	wxBitmap *bitmap = new wxBitmap;
	270	if ( InstantiateBitmap(bitmap) )
	271	return bitmap;
	272	else
	273	{
	274	delete bitmap;
	275	return NULL;
	276	}
	277	}
	278
	279	bool wxPNGReader::InstantiateBitmap(wxBitmap *bitmap)
	280	{
	281	HDC dc = ::CreateCompatibleDC(NULL);
	282
	283	if (dc)
	284	{
	285	// tmpBitmap is a dummy, to satisfy ::CreateCompatibleDC (it
	286	// is a memory dc that must have a bitmap selected into it)
	287	HDC dc2 = GetDC(NULL);
	288	HBITMAP tmpBitmap = ::CreateCompatibleBitmap(dc2, GetWidth(), GetHeight());
	289	ReleaseDC(NULL, dc2);
	290	HBITMAP oldBitmap = (HBITMAP) ::SelectObject(dc, tmpBitmap);
	291
	292	if ( Palette )
	293	{
	294	HPALETTE oldPal = ::SelectPalette(dc, (HPALETTE) Palette->GetHPALETTE(), FALSE);
	295	::RealizePalette(dc);
	296	}
	297
	298	HBITMAP hBitmap = ::CreateDIBitmap(dc, lpbi,
	299	CBM_INIT, RawImage, (LPBITMAPINFO) lpbi, DIB_PAL_COLORS);
	300
	301	::SelectPalette(dc, NULL, TRUE);
	302	::SelectObject(dc, oldBitmap);
	303	::DeleteObject(tmpBitmap);
	304	::DeleteDC(dc);
	305
	306	if ( hBitmap )
	307	{
	308	bitmap->SetHBITMAP((WXHBITMAP) hBitmap);
	309	bitmap->SetWidth(GetWidth());
	310	bitmap->SetHeight(GetHeight());
	311	bitmap->SetDepth(GetDepth());
	312	if ( GetDepth() > 1 && Palette )
	313	bitmap->SetPalette(*Palette);
	314	bitmap->SetOk(TRUE);
	315
	316
	317	// Make a mask if appropriate
	318	if ( bgindex > -1 )
	319	{
	320	wxMask *mask = CreateMask();
	321	bitmap->SetMask(mask);
	322	}
	323	return TRUE;
	324	}
	325	else
	326	{
	327	return FALSE;
	328	}
	329	}
	330	else
	331	{
	332	return FALSE;
	333	}
	334	}
	335
	336	wxPalette wxCopyPalette(const wxPalette cmap)
	337	{
	338	// To get number of entries...
	339	WORD count = 0;
	340	::GetObject((HPALETTE) cmap->GetHPALETTE(), sizeof(WORD), &count);
	341
	342	LOGPALETTE* logPal = (LOGPALETTE*)
	343	new BYTE[sizeof(LOGPALETTE) + count*sizeof(PALETTEENTRY)];
	344	logPal->palVersion = 0x300;
	345	logPal->palNumEntries = count;
	346	::GetPaletteEntries((HPALETTE) cmap->GetHPALETTE(), 0, count, logPal->palPalEntry);
	347
	348	HPALETTE hPalette = ::CreatePalette(logPal);
	349	delete[] logPal;
	350
	351	wxPalette *newCmap = new wxPalette;
	352	newCmap->SetHPALETTE((WXHPALETTE) hPalette);
	353	return newCmap;
	354	}
	355
	356	wxMask *wxPNGReader::CreateMask(void)
	357	{
	358	HBITMAP hBitmap = ::CreateBitmap(GetWidth(), GetHeight(), 1, 1, NULL);
	359
	360	HDC dc = ::CreateCompatibleDC(NULL);
	361	HBITMAP oldBitmap = (HBITMAP) ::SelectObject(dc, hBitmap);
	362
	363	int bgIndex = GetBGIndex();
	364
	365	int x,y;
	366
	367	for (x=0; x<GetWidth(); x++)
	368	{
	369	for (y=0; y<GetHeight(); y++)
	370	{
	371	int index = GetIndex(x, y);
	372	if ( index == bgIndex )
	373	::SetPixel(dc, x, GetHeight() - y - 1, RGB(0, 0, 0));
	374	else
	375	::SetPixel(dc, x, GetHeight() - y - 1, RGB(255, 255, 255));
	376
	377	}
	378	}
	379	::SelectObject(dc, oldBitmap);
	380	wxMask *mask = new wxMask;
	381	mask->SetMaskBitmap((WXHBITMAP) hBitmap);
	382	return mask;
	383	}
	384
	385	bool wxPNGReader::ReadFile(char * ImageFileName)
	386	{
	387	int number_passes;
	388
	389	if (ImageFileName)
	390	strcpy(filename, ImageFileName);
	391
	392	FILE *fp;
	393	png_struct *png_ptr;
	394	png_info *info_ptr;
	395	wxPNGReaderIter iter(this);
	396
	397	/* open the file */
	398	fp = fopen(filename, "rb");
	399	if (!fp)
	400	return FALSE;
	401
	402	/* allocate the necessary structures */
	403	png_ptr = new (png_struct);
	404	if (!png_ptr)
	405	{
	406	fclose(fp);
	407	return FALSE;
	408	}
	409
	410	info_ptr = new (png_info);
	411	if (!info_ptr)
	412	{
	413	fclose(fp);
	414	delete(png_ptr);
	415	return FALSE;
	416	}
	417	/* set error handling */
	418	if (setjmp(png_ptr->jmpbuf))
	419	{
	420	png_read_destroy(png_ptr, info_ptr, (png_info *)0);
	421	fclose(fp);
	422	delete(png_ptr);
	423	delete(info_ptr);
	424
	425	/* If we get here, we had a problem reading the file */
	426	return FALSE;
	427	}
	428	//png_set_error(ima_png_error, NULL);
	429
	430	/* initialize the structures, info first for error handling */
	431	png_info_init(info_ptr);
	432	png_read_init(png_ptr);
	433
	434	/* set up the input control */
	435	png_init_io(png_ptr, fp);
	436
	437	/* read the file information */
	438	png_read_info(png_ptr, info_ptr);
	439
	440	/* allocate the memory to hold the image using the fields
	441	of png_info. */
	442	png_color_16 my_background={ 0, 31, 127, 255, 0 };
	443
	444	if (info_ptr->valid & PNG_INFO_bKGD)
	445	{
	446	png_set_background(png_ptr, &(info_ptr->background),
	447	PNG_BACKGROUND_GAMMA_FILE, 1, 1.0);
	448	if ( info_ptr->num_palette > 0 )
	449	bgindex = info_ptr->background.index;
	450	}
	451	else {
	452	png_set_background(png_ptr, &my_background,
	453	PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0);
	454
	455	// Added by JACS: guesswork!
	456	if ( info_ptr->num_trans != 0 )
	457	bgindex = info_ptr->num_trans - 1 ;
	458	}
	459
	460	/* tell libpng to strip 16 bit depth files down to 8 bits */
	461	if (info_ptr->bit_depth == 16)
	462	png_set_strip_16(png_ptr);
	463
	464	int pixel_depth=(info_ptr->pixel_depth<24) ? info_ptr->pixel_depth: 24;
	465	Create(info_ptr->width, info_ptr->height, pixel_depth,
	466	info_ptr->color_type);
	467
	468	if (info_ptr->num_palette>0)
	469	{
	470	SetPalette((int)info_ptr->num_palette, (rgb_color_struct*)info_ptr->palette);
	471	}
	472
	473	int row_stride = info_ptr->width * ((pixel_depth+7)>>3);
	474	// printf("P = %d D = %d RS= %d ", info_ptr->num_palette, info_ptr->pixel_depth,row_stride);
	475	// printf("CT = %d TRS = %d BD= %d ", info_ptr->color_type, info_ptr->valid & PNG_INFO_tRNS,info_ptr->bit_depth);
	476
	477	byte *row_pointers = new byte[row_stride];
	478
	479	/* turn on interlace handling */
	480	if (info_ptr->interlace_type)
	481	number_passes = png_set_interlace_handling(png_ptr);
	482	else
	483	number_passes = 1;
	484	// printf("NP = %d ", number_passes);
	485
	486	for (int pass=0; pass< number_passes; pass++) {
	487	iter.upset();
	488	int y=0;
	489	do {
	490	// (unsigned char *)iter.GetRow();
	491	if (info_ptr->interlace_type) {
	492	if (pass>0)
	493	iter.GetRow(row_pointers, row_stride);
	494	png_read_row(png_ptr, row_pointers, NULL);
	495	}
	496	else
	497	png_read_row(png_ptr, row_pointers, NULL);
	498
	499	iter.SetRow(row_pointers, row_stride);
	500	y++;
	501	} while(iter.PrevRow());
	502	// printf("Y=%d ",y);
	503	}
	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(char * ImageFileName)
	528	{
	529	if (ImageFileName)
	530	strcpy(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(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(char filename, char name)
	696	{
	697	char nameStr[256];
	698	if ( name )
	699	strcpy(nameStr, name);
	700	else
	701	{
	702	strcpy(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(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/msw/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((char) (const char) 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