161 lines
4.8 KiB
C++
161 lines
4.8 KiB
C++
// ==========================================================================
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// Class Specification : COXGraphicFile
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// ==========================================================================
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// Header file : OXGphFle.h
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// Version: 9.3
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// This software along with its related components, documentation and files ("The Libraries")
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// is © 1994-2007 The Code Project (1612916 Ontario Limited) and use of The Libraries is
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// governed by a software license agreement ("Agreement"). Copies of the Agreement are
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// available at The Code Project (www.codeproject.com), as part of the package you downloaded
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// to obtain this file, or directly from our office. For a copy of the license governing
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// this software, you may contact us at legalaffairs@codeproject.com, or by calling 416-849-8900.
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// //////////////////////////////////////////////////////////////////////////
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// Properties:
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// YES Abstract class (does not have any objects)
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// YES Derived from CObject
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// NO Is a Cwnd.
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// NO Two stage creation (constructor & Create())
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// NO Has a message map
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// NO Needs a resource (template)
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// NO Persistent objects (saveable on disk)
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// YES Uses exceptions
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// //////////////////////////////////////////////////////////////////////////
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// Desciption :
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// This class encapsulates the base functionality for graphic files.
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// It contains a few virtual functions, the CFile pointer, ...
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// Remark:
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//
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// Prerequisites (necessary conditions):
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//
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/////////////////////////////////////////////////////////////////////////////
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#ifndef __GRAPHICFILE_H__
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#define __GRAPHICFILE_H__
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#if _MSC_VER >= 1000
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#pragma once
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#endif // _MSC_VER >= 1000
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#include "OXDllExt.h"
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extern "C"
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{
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#define JPEG_CJPEG_DJPEG /* define proper options in jconfig.h */
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#define JPEG_INTERNAL_OPTIONS /* cjpeg.c,djpeg.c need to see xxx_SUPPORTED */
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#include "jinclude.h"
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#include "jpeglib.h"
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#include "jerror.h" /* get library error codes too */
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#include "cderror.h" /* get application-specific error codes */
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}
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#define ReadOK(buffer, len) (ReadData(buffer, len) == ((size_t) (len)))
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class OX_CLASS_DECL COXGraphicFile : public CObject
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{
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friend class COXJPEGCompressor;
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friend class COXJPEGDecompressor;
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// Data Members
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public:
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protected:
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CFile* m_pGraphFile;
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CString m_sFullPath;
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JSAMPARRAY m_buffer;
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JDIMENSION m_buffer_height;
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BOOL m_bTotalReset;
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private:
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// Member Functions
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public:
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COXGraphicFile();
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// --- In :
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// --- Out :
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// --- Returns :
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// --- Effect : Contructor of object
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COXGraphicFile(CString sFullPath);
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// --- In : sFullPath : the full path subdirs + name + extender of the graphic file
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// --- Out :
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// --- Returns :
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// --- Effect : Contructor of object
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// File will not be opened yet
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COXGraphicFile(CFile* pGraphicFile);
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// --- In : pGraphicFile : a pointer to a CFile. must already be open
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// Must have the right access mode
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// --- Out :
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// --- Returns :
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// --- Effect : Contructor of object
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// Could be used to pass a CMemFile as parameter
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CString GetFullFilePath();
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// --- In :
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// --- Out :
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// --- Returns : Gets the full path.
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// --- Effect :
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void SetTotalReset(BOOL bTotal);
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// --- In : bTotal : if TRUE, the graphics file object will reset all its internal members
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// like the file pointer.
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// --- Out :
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// --- Returns :
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// --- Effect : This functionalty is added to prevent or enforce the object to reset itself
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// completely. When the object is used with an opened CFile*, sometimes
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// it is not desired that the object clears this CFile* to NULL. E.g. This is
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// the case when this CFile* is a CMemFile* which contents vary but not its
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// pointer. Normally this object was intended to be constructed each time
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// you need it and then good programming practice dictates that it clears
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// all internals before destruction.
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#ifdef _DEBUG
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virtual void Dump(CDumpContext&) const;
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virtual void AssertValid() const;
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#endif //_DEBUG
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virtual ~COXGraphicFile();
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// --- In :
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// --- Out :
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// --- Returns :
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// --- Effect : Destructor of object
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protected:
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virtual BOOL StartInput(j_compress_ptr cinfo) = 0;
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virtual BOOL FinishInput(j_compress_ptr cinfo) = 0;
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virtual JDIMENSION GetPixelRows(j_compress_ptr cinfo) = 0;
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virtual BOOL StartOutput(j_decompress_ptr cinfo) = 0;
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virtual BOOL FinishOutput(j_decompress_ptr cinfo) = 0;
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virtual BOOL PutPixelRows(j_decompress_ptr cinfo, JDIMENSION rowsSupplied) = 0;
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virtual BOOL InitRead(j_compress_ptr cinfo) = 0;
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virtual BOOL InitWrite(j_decompress_ptr cinfo, BOOL bExtra = FALSE) = 0;
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size_t ReadData(void* pBuffer, size_t length);
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BOOL WriteData(const void* pBuffer, size_t length);
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// can throw file exceptions
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virtual void OpenFile(UINT nOpenFlags);
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virtual void AbortFile();
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virtual void CloseFile();
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private:
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};
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#endif //__GRAPHICFILE_H__
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