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pnmFileTypeJPG.h
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1/**
2 * PANDA 3D SOFTWARE
3 * Copyright (c) Carnegie Mellon University. All rights reserved.
4 *
5 * All use of this software is subject to the terms of the revised BSD
6 * license. You should have received a copy of this license along
7 * with this source code in a file named "LICENSE."
8 *
9 * @file pnmFileTypeJPG.h
10 * @author mike
11 * @date 2000-06-17
12 */
13
14#ifndef PNMFILETYPEJPG_H
15#define PNMFILETYPEJPG_H
16
17#include "pandabase.h"
18
19#ifdef HAVE_JPEG
20
21#include "pnmFileType.h"
22#include "pnmReader.h"
23#include "pnmWriter.h"
24
25#if defined(_WIN32)
26#ifndef WIN32_LEAN_AND_MEAN
27#define WIN32_LEAN_AND_MEAN 1
28#endif
29#include <windows.h> // we need to include this before jpeglib.
30#endif
31
32#ifdef HAVE_PNG
33// If we are going to be including png.h (in the unrelated file
34// pnmFileTypePNG.h), be sure to include it before including setjmp.h. Ugly
35// hack due to png weirdness with setjmp.
36#include <png.h>
37#endif
38
39// jconfig.h overrides our INLINE definition.
40#ifdef __GNUC__
41#pragma push_macro("INLINE")
42#endif
43
44 extern "C" {
45#include <stdio.h> // jpeglib requires this to be included first.
46#include <jpeglib.h>
47#include <setjmp.h>
48}
49
50// Restore our own INLINE definition.
51#ifdef __GNUC__
52#pragma pop_macro("INLINE")
53#endif
54
55/**
56 * For reading and writing Jpeg files.
57 */
58 class EXPCL_PANDA_PNMIMAGETYPES PNMFileTypeJPG : public PNMFileType {
59 public:
60 PNMFileTypeJPG();
61
62 virtual std::string get_name() const;
63
64 virtual int get_num_extensions() const;
65 virtual std::string get_extension(int n) const;
66 virtual std::string get_suggested_extension() const;
67
68 virtual bool has_magic_number() const;
69 virtual bool matches_magic_number(const std::string &magic_number) const;
70
71 virtual PNMReader *make_reader(std::istream *file, bool owns_file = true,
72 const std::string &magic_number = std::string());
73 virtual PNMWriter *make_writer(std::ostream *file, bool owns_file = true);
74
75 public:
76 class Reader : public PNMReader {
77 public:
78 Reader(PNMFileType *type, std::istream *file, bool owns_file, std::string magic_number);
79 ~Reader();
80
81 virtual void prepare_read();
82 virtual int read_data(xel *array, xelval *alpha);
83
84 private:
85 struct jpeg_decompress_struct _cinfo;
86 struct my_error_mgr {
87 struct jpeg_error_mgr pub;
88 jmp_buf setjmp_buffer;
89 };
90 typedef struct my_error_mgr *_my_error_ptr;
91 struct my_error_mgr _jerr;
92 bool _is_valid;
93 };
94
95 class Writer : public PNMWriter {
96 public:
97 Writer(PNMFileType *type, std::ostream *file, bool owns_file);
98
99 virtual int write_data(xel *array, xelval *alpha);
100 };
101
102
103 // The TypedWritable interface follows.
104 public:
105 static void register_with_read_factory();
106
107 protected:
108 static TypedWritable *make_PNMFileTypeJPG(const FactoryParams &params);
109
110 public:
111 static TypeHandle get_class_type() {
112 return _type_handle;
113 }
114 static void init_type() {
115 PNMFileType::init_type();
116 register_type(_type_handle, "PNMFileTypeJPG",
117 PNMFileType::get_class_type());
118 }
119 virtual TypeHandle get_type() const {
120 return get_class_type();
121 }
122 virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
123
124 private:
125 static TypeHandle _type_handle;
126};
127
128#endif // HAVE_JPEG
129
130#endif
PNMFileType
This is the base class of a family of classes that represent particular image file types that PNMImag...
Definition pnmFileType.h:32
PNMFileType::has_magic_number
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:76
PNMFileType::get_suggested_extension
get_suggested_extension
Returns a suitable filename extension (without a leading dot) to suggest for files of this type,...
Definition pnmFileType.h:49
PNMFileType::make_reader
virtual PNMReader * make_reader(std::istream *file, bool owns_file=true, const std::string &magic_number=std::string())
Allocates and returns a new PNMReader suitable for reading from this file type, if possible.
Definition pnmFileType.cxx:96
PNMFileType::get_num_extensions
get_num_extensions
Returns the number of different possible filename extensions associated with this particular file typ...
Definition pnmFileType.h:44
PNMFileType::make_writer
virtual PNMWriter * make_writer(std::ostream *file, bool owns_file=true)
Allocates and returns a new PNMWriter suitable for reading from this file type, if possible.
Definition pnmFileType.cxx:106
PNMFileType::get_extension
get_extension
Returns the nth possible filename extension associated with this particular file type,...
Definition pnmFileType.h:44
PNMFileType::matches_magic_number
virtual bool matches_magic_number(const std::string &magic_number) const
Returns true if the indicated "magic number" byte stream (the initial few bytes read from the file) m...
Definition pnmFileType.cxx:86
pandabase.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
pnmFileType.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
pnmReader.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
pnmWriter.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
register_type
void register_type(TypeHandle &type_handle, const std::string &name)
This inline function is just a convenient way to call TypeRegistry::register_type(),...
Definition register_type.I:22