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pnmFileTypeTGA.h
1 // Filename: pnmFileTypeTGA.h
2 // Created by: drose (27Apr01)
3 //
4 ////////////////////////////////////////////////////////////////////
5 //
6 // PANDA 3D SOFTWARE
7 // Copyright (c) Carnegie Mellon University. All rights reserved.
8 //
9 // All use of this software is subject to the terms of the revised BSD
10 // license. You should have received a copy of this license along
11 // with this source code in a file named "LICENSE."
12 //
13 ////////////////////////////////////////////////////////////////////
14 
15 #ifndef PNMFILETYPETGA_H
16 #define PNMFILETYPETGA_H
17 
18 #include "pandabase.h"
19 
20 #ifdef HAVE_TGA
21 
22 #include "pnmFileType.h"
23 #include "pnmReader.h"
24 #include "pnmWriter.h"
25 #include "ppmcmap.h"
26 #include "pnmimage_base.h"
27 
28 struct ImageHeader;
29 
30 
31 ////////////////////////////////////////////////////////////////////
32 // Class : PNMFileTypeTGA
33 // Description : For reading and writing Targa image files.
34 ////////////////////////////////////////////////////////////////////
35 class EXPCL_PANDA_PNMIMAGETYPES PNMFileTypeTGA : public PNMFileType {
36 public:
37  PNMFileTypeTGA();
38 
39  virtual string get_name() const;
40 
41  virtual int get_num_extensions() const;
42  virtual string get_extension(int n) const;
43  virtual string get_suggested_extension() const;
44 
45  virtual PNMReader *make_reader(istream *file, bool owns_file = true,
46  const string &magic_number = string());
47  virtual PNMWriter *make_writer(ostream *file, bool owns_file = true);
48 
49 public:
50  class Reader : public PNMReader {
51  public:
52  Reader(PNMFileType *type, istream *file, bool owns_file, string magic_number);
53  virtual ~Reader();
54 
55  virtual int read_data(xel *array, xelval *alpha);
56 
57  private:
58  void readtga ( istream* ifp, struct ImageHeader* tgaP, const string &magic_number );
59  void get_map_entry ( istream* ifp, pixel* Value, int Size,
60  gray* Alpha);
61  void get_pixel ( istream* ifp, pixel* dest, int Size, gray* alpha_p);
62  unsigned char getbyte ( istream* ifp );
63 
64  int rows, cols, rlencoded, mapped;
65  struct ImageHeader *tga_head;
66  pixel *ColorMap;
67  gray *AlphaMap;
68  int RLE_count, RLE_flag;
69 
70  pixval Red, Grn, Blu;
71  pixval Alpha;
72  unsigned int l;
73  };
74 
75  class Writer : public PNMWriter {
76  public:
77  Writer(PNMFileType *type, ostream *file, bool owns_file);
78  virtual ~Writer();
79 
80  virtual int write_data(xel *array, xelval *alpha);
81 
82  private:
83  void writetga ( struct ImageHeader* tgaP, char* id );
84  void put_map_entry ( pixel* valueP, int size, pixval maxval );
85  void compute_runlengths ( int cols, pixel* pixelrow, int* runlength );
86  void put_pixel ( pixel* pP, int imgtype, pixval maxval, colorhash_table cht );
87  void put_mono ( pixel* pP, pixval maxval );
88  void put_map ( pixel* pP, colorhash_table cht );
89  void put_rgb ( pixel* pP, pixval maxval );
90 
91  int rle_flag;
92  int rows, cols;
93  struct ImageHeader *tgaHeader;
94  colorhist_vector chv;
95  colorhash_table cht;
96  int ncolors;
97  int *runlength;
98  };
99 
100 
101  // The TypedWritable interface follows.
102 public:
103  static void register_with_read_factory();
104 
105 protected:
106  static TypedWritable *make_PNMFileTypeTGA(const FactoryParams &params);
107 
108 public:
109  static TypeHandle get_class_type() {
110  return _type_handle;
111  }
112  static void init_type() {
113  PNMFileType::init_type();
114  register_type(_type_handle, "PNMFileTypeTGA",
115  PNMFileType::get_class_type());
116  }
117  virtual TypeHandle get_type() const {
118  return get_class_type();
119  }
120  virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
121 
122 private:
123  static TypeHandle _type_handle;
124 };
125 
126 #endif // HAVE_TGA
127 
128 #endif
129 
130 
virtual string get_extension(int n) const
Returns the nth possible filename extension associated with this particular file type, without a leading dot.
Definition: pnmFileType.cxx:62
virtual PNMWriter * make_writer(ostream *file, bool owns_file=true)
Allocates and returns a new PNMWriter suitable for reading from this file type, if possible...
Base class for objects that can be written to and read from Bam files.
Definition: typedWritable.h:37
This is the base class of a family of classes that represent particular image file types that PNMImag...
Definition: pnmFileType.h:35
virtual int get_num_extensions() const
Returns the number of different possible filename extensions associated with this particular file typ...
Definition: pnmFileType.cxx:50
virtual PNMReader * make_reader(istream *file, bool owns_file=true, const string &magic_number=string())
Allocates and returns a new PNMReader suitable for reading from this file type, if possible...
virtual string get_suggested_extension() const
Returns a suitable filename extension (without a leading dot) to suggest for files of this type...
Definition: pnmFileType.cxx:75
An instance of this class is passed to the Factory when requesting it to do its business and construc...
Definition: factoryParams.h:40
This is an abstract base class that defines the interface for reading image files of various types...
Definition: pnmReader.h:31
This is an abstract base class that defines the interface for writing image files of various types...
Definition: pnmWriter.h:31
TypeHandle is the identifier used to differentiate C++ class types.
Definition: typeHandle.h:85