/* * File:	ximapng.h * Purpose:	PNG Image Class Loader and Writer *//* === C R E D I T S  &  D I S C L A I M E R S ============== * CxImagePNG (c) 07/Aug/2001 Davide Pizzolato - www.xdp.it * Permission is given by the author to freely redistribute and include * this code in any program as long as this credit is given where due. * * CxImage version 5.99a 08/Feb/2004 * See the file history.htm for the complete bugfix and news report. * * 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 version 1.2.1 - December 12, 2001 * Copyright (c) 1998-2001 Glenn Randers-Pehrson * * COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY * OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES * THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE * OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED * CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT * THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY * SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL * PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER * THIS DISCLAIMER. * * Use at your own risk! * ========================================================== */#if !defined(__ximaPNG_h)#define __ximaPNG_h#include "ximage.h"#if CXIMAGE_SUPPORT_PNGextern "C" {#include "../png/png.h"}class CxImagePNG: public CxImage{public:	CxImagePNG(): CxImage(CXIMAGE_FORMAT_PNG) {}//	bool Load(const char * imageFileName){ return CxImage::Load(imageFileName,CXIMAGE_FORMAT_PNG);}//	bool Save(const char * 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_ENCODEprotected:	void ima_png_error(png_struct *png_ptr, char *message);	void expand2to4bpp(BYTE* prow);	static void user_read_data(png_structp png_ptr, png_bytep data, png_size_t length)	{		CxFile* hFile = (CxFile*)png_ptr->io_ptr;		if (hFile->Read(data,1,length) != length) png_error(png_ptr, "Read Error");	}	static void user_write_data(png_structp png_ptr, png_bytep data, png_size_t length)	{		CxFile* hFile = (CxFile*)png_ptr->io_ptr;		if (hFile->Write(data,1,length) != length) png_error(png_ptr, "Write Error");	}	static void user_flush_data(png_structp png_ptr)	{		CxFile* hFile = (CxFile*)png_ptr->io_ptr;		if (!hFile->Flush()) png_error(png_ptr, "Flush Error");	}    static void user_error_fn(png_structp png_ptr,png_const_charp error_msg)	{		strncpy((char*)png_ptr->error_ptr,error_msg,255);		longjmp(png_ptr->jmpbuf, 1);	}};#endif#endif