// Filename: pnmFileTypeAlias.h
// Created by:  drose (17Jun00)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) 2001 - 2004, Disney Enterprises, Inc.  All rights reserved
//
// All use of this software is subject to the terms of the Panda 3d
// Software license.  You should have received a copy of this license
// along with this source code; you will also find a current copy of
// the license at http://etc.cmu.edu/panda3d/docs/license/ .
//
// To contact the maintainers of this program write to
// panda3d-general@lists.sourceforge.net .
//
////////////////////////////////////////////////////////////////////

#ifndef PNMFILETYPEALIAS_H
#define PNMFILETYPEALIAS_H

#include "pandabase.h"

#include "pnmFileType.h"
#include "pnmReader.h"
#include "pnmWriter.h"

////////////////////////////////////////////////////////////////////
//       Class : PNMFileTypeAlias
// Description : For reading and Alias native image files.
////////////////////////////////////////////////////////////////////
class EXPCL_PANDA PNMFileTypeAlias : public PNMFileType {
public:
  PNMFileTypeAlias();

  virtual string get_name() const;

  virtual int get_num_extensions() const;
  virtual string get_extension(int n) const;
  virtual string get_suggested_extension() const;

  virtual PNMReader *make_reader(istream *file, bool owns_file = true,
                                 const string &magic_number = string());
  virtual PNMWriter *make_writer(ostream *file, bool owns_file = true);

public:
  class Reader : public PNMReader {
  public:
    Reader(PNMFileType *type, istream *file, bool owns_file, string magic_number);

    virtual bool supports_read_row() const;
    virtual bool read_row(xel *array, xelval *alpha, int x_size, int y_size);
  };

  class Writer : public PNMWriter {
  public:
    Writer(PNMFileType *type, ostream *file, bool owns_file);

    virtual bool supports_write_row() const;
    virtual bool write_header();
    virtual bool write_row(xel *array, xelval *alpha);
  };


  // The TypedWritable interface follows.
public:
  static void register_with_read_factory();

protected:
  static TypedWritable *make_PNMFileTypeAlias(const FactoryParams &params);

public:
  static TypeHandle get_class_type() {
    return _type_handle;
  }
  static void init_type() {
    PNMFileType::init_type();
    register_type(_type_handle, "PNMFileTypeAlias",
                  PNMFileType::get_class_type());
  }
  virtual TypeHandle get_type() const {
    return get_class_type();
  }
  virtual TypeHandle force_init_type() {init_type(); return get_class_type();}

private:
  static TypeHandle _type_handle;
};

#endif


