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/*
* File: ximapng.h
* Purpose: PNG Image Class Loader and Writer
*/
/* ==========================================================
* CxImagePNG (c) 07/Aug/2001 Davide Pizzolato - www.xdp.it
* For conditions of distribution and use, see copyright notice in ximage.h
*
* Special thanks to Troels Knakkergaard for new features, enhancements and bugfixes
*
* original CImagePNG and CImageIterator implementation are:
* Copyright: (c) 1995, Alejandro Aguilar Sierra <asierra(at)servidor(dot)unam(dot)mx>
*
* libpng Copyright (c) 1998-2003 Glenn Randers-Pehrson
* ==========================================================
*/
#if !defined(__ximaPNG_h)
#define __ximaPNG_h
#include "ximage.h"
#if CXIMAGE_SUPPORT_PNG
extern "C" {
#ifdef _LINUX
#undef _DLL
#include <png.h>
#else
#include "../png/png.h"
#endif
}
#if PNG_LIBPNG_VER > 10499
#define USE_NEW_LIBPNG_API
#endif
class CxImagePNG: public CxImage
{
public:
CxImagePNG(): CxImage(CXIMAGE_FORMAT_PNG) {}
// bool Load(const TCHAR * imageFileName){ return CxImage::Load(imageFileName,CXIMAGE_FORMAT_PNG);}
// bool Save(const TCHAR * imageFileName){ return CxImage::Save(imageFileName,CXIMAGE_FORMAT_PNG);}
bool Decode(CxFile * hFile);
bool Decode(FILE *hFile) { CxIOFile file(hFile); return Decode(&file); }
#if CXIMAGE_SUPPORT_ENCODE
bool Encode(CxFile * hFile);
bool Encode(FILE *hFile) { CxIOFile file(hFile); return Encode(&file); }
#endif // CXIMAGE_SUPPORT_ENCODE
protected:
void ima_png_error(png_struct *png_ptr, char *message);
void expand2to4bpp(BYTE* prow);
static void PNGAPI user_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
CxFile* hFile = (CxFile*)png_get_io_ptr(png_ptr);
if (hFile == NULL || hFile->Read(data,1,length) != length) png_error(png_ptr, "Read Error");
}
static void PNGAPI user_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
CxFile* hFile = (CxFile*)png_get_io_ptr(png_ptr);
if (hFile == NULL || hFile->Write(data,1,length) != length) png_error(png_ptr, "Write Error");
}
static void PNGAPI user_flush_data(png_structp png_ptr)
{
CxFile* hFile = (CxFile*)png_get_io_ptr(png_ptr);
if (hFile == NULL || !hFile->Flush()) png_error(png_ptr, "Flush Error");
}
static void PNGAPI user_error_fn(png_structp png_ptr,png_const_charp error_msg)
{
#ifdef USE_NEW_LIBPNG_API
strncpy((char*)png_get_error_ptr(png_ptr),error_msg,255);
longjmp(png_jmpbuf(png_ptr), 1);
#else
strncpy((char*)png_ptr->error_ptr,error_msg,255);
longjmp(png_ptr->jmpbuf, 1);
#endif
}
};
#endif
#endif
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