95 lines
2.7 KiB
C
95 lines
2.7 KiB
C
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/*
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* File: ximapng.h
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* Purpose: PNG Image Class Loader and Writer
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*/
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/* ==========================================================
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* CxImagePNG (c) 07/Aug/2001 Davide Pizzolato - www.xdp.it
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* For conditions of distribution and use, see copyright notice in ximage.h
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*
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* Special thanks to Troels Knakkergaard for new features, enhancements and bugfixes
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*
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* original CImagePNG and CImageIterator implementation are:
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* Copyright: (c) 1995, Alejandro Aguilar Sierra <asierra(at)servidor(dot)unam(dot)mx>
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*
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* libpng Copyright (c) 1998-2003 Glenn Randers-Pehrson
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* ==========================================================
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*/
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#if !defined(__ximaPNG_h)
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#define __ximaPNG_h
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#include "ximage.h"
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#if CXIMAGE_SUPPORT_PNG
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extern "C" {
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#ifdef _LINUX
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#undef _DLL
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#include <png.h>
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#include <pngstruct.h>
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#include <pnginfo.h>
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#else
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#include "../png/png.h"
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#include "../png/pngstruct.h"
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#include "../png/pnginfo.h"
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#endif
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}
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class CxImagePNG: public CxImage
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{
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public:
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CxImagePNG(): CxImage(CXIMAGE_FORMAT_PNG) {}
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// bool Load(const TCHAR * imageFileName){ return CxImage::Load(imageFileName,CXIMAGE_FORMAT_PNG);}
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// bool Save(const TCHAR * imageFileName){ return CxImage::Save(imageFileName,CXIMAGE_FORMAT_PNG);}
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bool Decode(CxFile * hFile);
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bool Decode(FILE *hFile) { CxIOFile file(hFile); return Decode(&file); }
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#if CXIMAGE_SUPPORT_ENCODE
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bool Encode(CxFile * hFile);
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bool Encode(FILE *hFile) { CxIOFile file(hFile); return Encode(&file); }
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#endif // CXIMAGE_SUPPORT_ENCODE
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enum CODEC_OPTION
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{
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ENCODE_INTERLACE = 0x01,
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// Exclusive compression types : 3 bit wide field
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ENCODE_COMPRESSION_MASK = 0x0E,
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ENCODE_NO_COMPRESSION = 1 << 1,
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ENCODE_BEST_SPEED = 2 << 1,
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ENCODE_BEST_COMPRESSION = 3 << 1,
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ENCODE_DEFAULT_COMPRESSION = 4 << 1
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};
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protected:
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void ima_png_error(png_struct *png_ptr, char *message);
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void expand2to4bpp(uint8_t* prow);
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static void PNGAPI user_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
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{
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CxFile* hFile = (CxFile*)png_get_io_ptr(png_ptr);
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if (hFile == NULL || hFile->Read(data,1,length) != length) png_error(png_ptr, "Read Error");
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}
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static void PNGAPI user_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
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{
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CxFile* hFile = (CxFile*)png_get_io_ptr(png_ptr);
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if (hFile == NULL || hFile->Write(data,1,length) != length) png_error(png_ptr, "Write Error");
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}
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static void PNGAPI user_flush_data(png_structp png_ptr)
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{
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CxFile* hFile = (CxFile*)png_get_io_ptr(png_ptr);
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if (hFile == NULL || !hFile->Flush()) png_error(png_ptr, "Flush Error");
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}
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static void PNGAPI user_error_fn(png_structp png_ptr,png_const_charp error_msg)
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{
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strncpy((char*)png_ptr->error_ptr,error_msg,255);
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longjmp(png_ptr->png_jmpbuf, 1);
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}
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};
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#endif
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#endif
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