Panda3D

pnmReader.h

00001 // Filename: pnmReader.h
00002 // Created by:  drose (14Jun00)
00003 //
00004 ////////////////////////////////////////////////////////////////////
00005 //
00006 // PANDA 3D SOFTWARE
00007 // Copyright (c) Carnegie Mellon University.  All rights reserved.
00008 //
00009 // All use of this software is subject to the terms of the revised BSD
00010 // license.  You should have received a copy of this license along
00011 // with this source code in a file named "LICENSE."
00012 //
00013 ////////////////////////////////////////////////////////////////////
00014 
00015 #ifndef PNMREADER_H
00016 #define PNMREADER_H
00017 
00018 #include "pandabase.h"
00019 
00020 #include "pnmImageHeader.h"
00021 
00022 
00023 ////////////////////////////////////////////////////////////////////
00024 //       Class : PNMReader
00025 // Description : This is an abstract base class that defines the
00026 //               interface for reading image files of various types.
00027 //               Any particular image file type that can be read must
00028 //               define a class that inherits from PNMReader to read
00029 //               it.
00030 ////////////////////////////////////////////////////////////////////
00031 class EXPCL_PANDA_PNMIMAGE PNMReader : public PNMImageHeader {
00032 protected:
00033   INLINE PNMReader(PNMFileType *type, istream *file, bool owns_file);
00034 
00035 public:
00036   virtual ~PNMReader();
00037   INLINE void set_read_size(int x_size, int y_size);
00038 
00039   INLINE PNMFileType *get_type() const;
00040 
00041   virtual void prepare_read();
00042   virtual int read_data(xel *array, xelval *alpha);
00043   virtual bool supports_read_row() const;
00044   virtual bool read_row(xel *array, xelval *alpha, int x_size, int y_size);
00045 
00046   virtual bool supports_stream_read() const;
00047 
00048   INLINE bool is_valid() const;
00049 
00050 private:
00051   int get_reduction_shift(int orig_size, int new_size);
00052 
00053 protected:
00054   PNMFileType *_type;
00055   bool _owns_file;
00056   istream *_file;
00057   bool _is_valid;
00058 
00059   int _read_x_size, _read_y_size;
00060   bool _has_read_size;
00061 
00062   int _x_shift, _y_shift;
00063   int _orig_x_size, _orig_y_size;
00064 };
00065 
00066 #include "pnmReader.I"
00067 
00068 #endif
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