www.pudn.com > MyBloodVessel.rar > ximapng.h

/* 
 * 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  
 * 
 * libpng Copyright (c) 1998-2003 Glenn Randers-Pehrson 
 * ========================================================== 
 */ 
#if !defined(__ximaPNG_h) 
#define __ximaPNG_h 
 
#include "ximage.h" 
 
#if CXIMAGE_SUPPORT_PNG 
 
extern "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_ENCODE 
 
protected: 
	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