// Filename: pnmFileTypeTGA.h
// Created by:  drose (27Apr01)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) 2001, 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://www.panda3d.org/license.txt .
//
// To contact the maintainers of this program write to
// panda3d@yahoogroups.com .
//
////////////////////////////////////////////////////////////////////

#ifndef PNMFILETYPETGA_H
#define PNMFILETYPETGA_H

#include <pandabase.h>

#include <pnmFileType.h>
#include <pnmReader.h>
#include <pnmWriter.h>

extern "C" {
#include <ppmcmap.h>
}

struct ImageHeader;


/* Max number of colors allowed for colormapped output. */
#define TGA_MAXCOLORS 257

////////////////////////////////////////////////////////////////////
//       Class : PNMFileTypeTGA
// Description : For reading and writing Targa image files.
////////////////////////////////////////////////////////////////////
class EXPCL_PANDA PNMFileTypeTGA : public PNMFileType {
public:
  PNMFileTypeTGA();

  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(FILE *file, bool owns_file = true,
                                 const string &magic_number = string());
  virtual PNMWriter *make_writer(FILE *file, bool owns_file = true);

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

    virtual int read_data(xel *array, xelval *alpha);

  private:
    void readtga ( FILE* ifp, struct ImageHeader* tgaP, const string &magic_number );
    void get_map_entry ( FILE* ifp, pixel* Value, int Size,
                         gray* Alpha);
    void get_pixel ( FILE* ifp, pixel* dest, int Size, gray* alpha_p);
    unsigned char getbyte ( FILE* ifp );

    int rows, cols, rlencoded, mapped;
    struct ImageHeader *tga_head;
    pixel ColorMap[TGA_MAXCOLORS];
    gray AlphaMap[TGA_MAXCOLORS];
    int RLE_count, RLE_flag;
  };

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

    virtual int write_data(xel *array, xelval *alpha);

  private:
    void writetga ( struct ImageHeader* tgaP, char* id );
    void put_map_entry ( pixel* valueP, int size, pixval maxval );
    void compute_runlengths ( int cols, pixel* pixelrow, int* runlength );
    void put_pixel ( pixel* pP, int imgtype, pixval maxval, colorhash_table cht );
    void put_mono ( pixel* pP, pixval maxval );
    void put_map ( pixel* pP, colorhash_table cht );
    void put_rgb ( pixel* pP, pixval maxval );

    int rle_flag;
    int rows, cols;
    struct ImageHeader *tgaHeader;
    colorhist_vector chv;
    colorhash_table cht;
    int ncolors;
    int *runlength;
  };


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

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

public:
  static TypeHandle get_class_type() {
    return _type_handle;
  }
  static void init_type() {
    PNMFileType::init_type();
    register_type(_type_handle, "PNMFileTypeTGA",
                  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


