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