Panda3D
pnmFileTypeSGI.h
1 // Filename: pnmFileTypeSGI.h
2 // Created by: drose (17Jun00)
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 PNMFILETYPESGI_H
16 #define PNMFILETYPESGI_H
17 
18 #include "pandabase.h"
19 
20 #ifdef HAVE_SGI_RGB
21 
22 #include "pnmFileType.h"
23 #include "pnmReader.h"
24 #include "pnmWriter.h"
25 
26 ////////////////////////////////////////////////////////////////////
27 // Class : PNMFileTypeSGI
28 // Description : For reading and writing SGI RGB files.
29 ////////////////////////////////////////////////////////////////////
30 class EXPCL_PANDA_PNMIMAGETYPES PNMFileTypeSGI : public PNMFileType {
31 public:
32  PNMFileTypeSGI();
33 
34  virtual string get_name() const;
35 
36  virtual int get_num_extensions() const;
37  virtual string get_extension(int n) const;
38  virtual string get_suggested_extension() const;
39 
40  virtual bool has_magic_number() const;
41  virtual bool matches_magic_number(const string &magic_number) const;
42 
43  virtual PNMReader *make_reader(istream *file, bool owns_file = true,
44  const string &magic_number = string());
45  virtual PNMWriter *make_writer(ostream *file, bool owns_file = true);
46 
47 public:
48  class Reader : public PNMReader {
49  public:
50  Reader(PNMFileType *type, istream *file, bool owns_file, string magic_number);
51  virtual ~Reader();
52 
53  virtual bool supports_read_row() const;
54  virtual bool read_row(xel *array, xelval *alpha, int x_size, int y_size);
55 
56  typedef struct {
57  long start; /* offset in file */
58  long length; /* length of compressed scanline */
59  } TabEntry;
60 
61  private:
62  TabEntry *table;
63  long table_start;
64  int current_row;
65  int bpc;
66  };
67 
68  class Writer : public PNMWriter {
69  public:
70  Writer(PNMFileType *type, ostream *file, bool owns_file);
71  virtual ~Writer();
72 
73  virtual bool supports_write_row() const;
74  virtual bool write_header();
75  virtual bool write_row(xel *array, xelval *alpha);
76 
77  typedef struct {
78  long start; /* offset in file */
79  long length; /* length of compressed scanline */
80  } TabEntry;
81 
82  typedef short ScanElem;
83  typedef struct {
84  ScanElem * data;
85  long length;
86  } ScanLine;
87 
88  private:
89  TabEntry &Table(int chan) {
90  return table[chan * _y_size + current_row];
91  }
92 
93  void write_rgb_header(const char *imagename);
94  void write_table();
95  void write_channels(ScanLine channel[], void (*put)(ostream *, short));
96  void build_scanline(ScanLine output[], xel *row_data, xelval *alpha_data);
97  ScanElem *compress(ScanElem *temp, ScanLine &output);
98  int rle_compress(ScanElem *inbuf, int size);
99 
100  TabEntry *table;
101  long table_start;
102  int current_row;
103  int bpc;
104  int dimensions;
105  int new_maxval;
106 
107  ScanElem *rletemp;
108  };
109 
110 
111  // The TypedWritable interface follows.
112 public:
113  static void register_with_read_factory();
114 
115 protected:
116  static TypedWritable *make_PNMFileTypeSGI(const FactoryParams &params);
117 
118 public:
119  static TypeHandle get_class_type() {
120  return _type_handle;
121  }
122  static void init_type() {
123  PNMFileType::init_type();
124  register_type(_type_handle, "PNMFileTypeSGI",
125  PNMFileType::get_class_type());
126  }
127  virtual TypeHandle get_type() const {
128  return get_class_type();
129  }
130  virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
131 
132 private:
133  static TypeHandle _type_handle;
134 };
135 
136 #endif // HAVE_SGI_RGB
137 
138 #endif
139 
140 
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 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 bool matches_magic_number(const string &magic_number) const
Returns true if the indicated "magic number" byte stream (the initial few bytes read from the file) m...
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
virtual bool has_magic_number() const
Returns true if this particular file type uses a magic number to identify it, false otherwise...
Definition: pnmFileType.cxx:89
TypeHandle is the identifier used to differentiate C++ class types.
Definition: typeHandle.h:85
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 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