00001 /** \file
00002  * \brief File Format Access
00003  *
00004  * See Copyright Notice in im_lib.h
00005  * $Id: im_format.h,v 1.5 2006/11/22 19:55:32 scuri Exp $
00006  */
00007 
00008 #include "im_file.h"
00009 #include "im_attrib.h"
00010 
00011 #ifndef __IM_FORMAT_H
00012 #define __IM_FORMAT_H
00013 
00014 
00015 /** \brief Image File Format Driver (SDK Use Only) 
00016  * 
00017  * \par
00018  * Virtual Base class for file formats. All file formats inherit from this class.
00019  * \ingroup filesdk */
00020 class imFormat: public _imFile
00021 {
00022 public:
00023   const char* format; 
00024   const char* desc;
00025   const char* ext;
00026   const char** comp;
00027   int comp_count, 
00028       can_sequence;
00029 
00030   imFormat(const char* _format, const char* _desc, const char* _ext, 
00031            const char** _comp, int _comp_count, int _can_sequence)
00032     :format(_format), desc(_desc), ext(_ext), comp(_comp), 
00033      comp_count(_comp_count), can_sequence(_can_sequence)
00034     {} 
00035   virtual ~imFormat() {}
00036 
00037   imAttribTable* AttribTable() {return (imAttribTable*)this->attrib_table;}
00038 
00039   /* Pure Virtual Methods. Every driver must implement all the following methods. */
00040 
00041   virtual int Open(const char* file_name) = 0; // Must initialize compression and image_count
00042   virtual int New(const char* file_name) = 0;
00043   virtual void Close() = 0;
00044   virtual void* Handle(int index) = 0;
00045   virtual int ReadImageInfo(int index) = 0;    // Should update compression
00046   virtual int ReadImageData(void* data) = 0;
00047   virtual int WriteImageInfo() = 0;            // Should update compression
00048   virtual int WriteImageData(void* data) = 0;  // Must update image_count
00049   virtual int CanWrite(const char* compression, int color_mode, int data_type) const = 0;
00050 };
00051 
00052 extern "C"
00053 {
00054 
00055 /* Internal Use only */
00056 
00057 /* Opens a file with the respective format driver 
00058  * Uses the file extension to speed up the search for the format driver.
00059  * Used by "im_file.cpp" only. */
00060 imFormat* imFormatOpen(const char* file_name, int *error);
00061 
00062 /* Opens a file with the given format
00063  * Used by "im_file.cpp" only. */
00064 imFormat* imFormatOpenAs(const char* file_name, const char* format, int *error);
00065 
00066 /* Creates a file using the given format driver.
00067  * Used by "im_file.cpp" only. */
00068 imFormat* imFormatNew(const char* file_name, const char* format, int *error);
00069 
00070 
00071 /* File Format SDK */
00072 
00073 /** Register a format driver.
00074  * \ingroup filesdk */
00075 void imFormatRegister(imFormat* iformat);
00076 
00077 
00078 }
00079 
00080 #endif