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VisualBoyAdvance-1.7.2
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cximage
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ximapng.h
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2004-02-29
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/*
* 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_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