Panda3D

pnmFileTypeTGA.h

00001 // Filename: pnmFileTypeTGA.h
00002 // Created by:  drose (27Apr01)
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 PNMFILETYPETGA_H
00016 #define PNMFILETYPETGA_H
00017 
00018 #include "pandabase.h"
00019 
00020 #ifdef HAVE_TGA
00021 
00022 #include "pnmFileType.h"
00023 #include "pnmReader.h"
00024 #include "pnmWriter.h"
00025 #include "ppmcmap.h"
00026 #include "pnmimage_base.h"
00027 
00028 struct ImageHeader;
00029 
00030 
00031 ////////////////////////////////////////////////////////////////////
00032 //       Class : PNMFileTypeTGA
00033 // Description : For reading and writing Targa image files.
00034 ////////////////////////////////////////////////////////////////////
00035 class EXPCL_PANDA_PNMIMAGETYPES PNMFileTypeTGA : public PNMFileType {
00036 public:
00037   PNMFileTypeTGA();
00038 
00039   virtual string get_name() const;
00040 
00041   virtual int get_num_extensions() const;
00042   virtual string get_extension(int n) const;
00043   virtual string get_suggested_extension() const;
00044 
00045   virtual PNMReader *make_reader(istream *file, bool owns_file = true,
00046                                  const string &magic_number = string());
00047   virtual PNMWriter *make_writer(ostream *file, bool owns_file = true);
00048 
00049 public:
00050   class Reader : public PNMReader {
00051   public:
00052     Reader(PNMFileType *type, istream *file, bool owns_file, string magic_number);
00053     virtual ~Reader();
00054 
00055     virtual int read_data(xel *array, xelval *alpha);
00056 
00057   private:
00058     void readtga ( istream* ifp, struct ImageHeader* tgaP, const string &magic_number );
00059     void get_map_entry ( istream* ifp, pixel* Value, int Size,
00060                          gray* Alpha);
00061     void get_pixel ( istream* ifp, pixel* dest, int Size, gray* alpha_p);
00062     unsigned char getbyte ( istream* ifp );
00063 
00064     int rows, cols, rlencoded, mapped;
00065     struct ImageHeader *tga_head;
00066     pixel *ColorMap;
00067     gray *AlphaMap;
00068     int RLE_count, RLE_flag;
00069   };
00070 
00071   class Writer : public PNMWriter {
00072   public:
00073     Writer(PNMFileType *type, ostream *file, bool owns_file);
00074     virtual ~Writer();
00075 
00076     virtual int write_data(xel *array, xelval *alpha);
00077 
00078   private:
00079     void writetga ( struct ImageHeader* tgaP, char* id );
00080     void put_map_entry ( pixel* valueP, int size, pixval maxval );
00081     void compute_runlengths ( int cols, pixel* pixelrow, int* runlength );
00082     void put_pixel ( pixel* pP, int imgtype, pixval maxval, colorhash_table cht );
00083     void put_mono ( pixel* pP, pixval maxval );
00084     void put_map ( pixel* pP, colorhash_table cht );
00085     void put_rgb ( pixel* pP, pixval maxval );
00086 
00087     int rle_flag;
00088     int rows, cols;
00089     struct ImageHeader *tgaHeader;
00090     colorhist_vector chv;
00091     colorhash_table cht;
00092     int ncolors;
00093     int *runlength;
00094   };
00095 
00096 
00097   // The TypedWritable interface follows.
00098 public:
00099   static void register_with_read_factory();
00100 
00101 protected:
00102   static TypedWritable *make_PNMFileTypeTGA(const FactoryParams &params);
00103 
00104 public:
00105   static TypeHandle get_class_type() {
00106     return _type_handle;
00107   }
00108   static void init_type() {
00109     PNMFileType::init_type();
00110     register_type(_type_handle, "PNMFileTypeTGA",
00111                   PNMFileType::get_class_type());
00112   }
00113   virtual TypeHandle get_type() const {
00114     return get_class_type();
00115   }
00116   virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
00117 
00118 private:
00119   static TypeHandle _type_handle;
00120 };
00121 
00122 #endif  // HAVE_TGA
00123 
00124 #endif
00125 
00126 
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