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cdjpeg.h (6123B)
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1 /*
2 * cdjpeg.h
3 *
4 * Copyright (C) 1994-1997, Thomas G. Lane.
5 * This file is part of the Independent JPEG Group's software.
6 * For conditions of distribution and use, see the accompanying README file.
7 *
8 * This file contains common declarations for the sample applications
9 * cjpeg and djpeg. It is NOT used by the core JPEG library.
10 */
11
12 #define JPEG_CJPEG_DJPEG /* define proper options in jconfig.h */
13 #define JPEG_INTERNAL_OPTIONS /* cjpeg.c,djpeg.c need to see xxx_SUPPORTED */
14 #include "jinclude.h"
15 #include "jpeglib.h"
16 #include "jerror.h" /* get library error codes too */
17 #include "cderror.h" /* get application-specific error codes */
18
19
20 /*
21 * Object interface for cjpeg's source file decoding modules
22 */
23
24 typedef struct cjpeg_source_struct * cjpeg_source_ptr;
25
26 struct cjpeg_source_struct {
27 JMETHOD(void, start_input, (j_compress_ptr cinfo,
28 cjpeg_source_ptr sinfo));
29 JMETHOD(JDIMENSION, get_pixel_rows, (j_compress_ptr cinfo,
30 cjpeg_source_ptr sinfo));
31 JMETHOD(void, finish_input, (j_compress_ptr cinfo,
32 cjpeg_source_ptr sinfo));
33
34 FILE *input_file;
35
36 JSAMPARRAY buffer;
37 JDIMENSION buffer_height;
38 };
39
40
41 /*
42 * Object interface for djpeg's output file encoding modules
43 */
44
45 typedef struct djpeg_dest_struct * djpeg_dest_ptr;
46
47 struct djpeg_dest_struct {
48 /* start_output is called after jpeg_start_decompress finishes.
49 * The color map will be ready at this time, if one is needed.
50 */
51 JMETHOD(void, start_output, (j_decompress_ptr cinfo,
52 djpeg_dest_ptr dinfo));
53 /* Emit the specified number of pixel rows from the buffer. */
54 JMETHOD(void, put_pixel_rows, (j_decompress_ptr cinfo,
55 djpeg_dest_ptr dinfo,
56 JDIMENSION rows_supplied));
57 /* Finish up at the end of the image. */
58 JMETHOD(void, finish_output, (j_decompress_ptr cinfo,
59 djpeg_dest_ptr dinfo));
60
61 /* Target file spec; filled in by djpeg.c after object is created. */
62 FILE * output_file;
63
64 /* Output pixel-row buffer. Created by module init or start_output.
65 * Width is cinfo->output_width * cinfo->output_components;
66 * height is buffer_height.
67 */
68 JSAMPARRAY buffer;
69 JDIMENSION buffer_height;
70 };
71
72
73 /*
74 * cjpeg/djpeg may need to perform extra passes to convert to or from
75 * the source/destination file format. The JPEG library does not know
76 * about these passes, but we'd like them to be counted by the progress
77 * monitor. We use an expanded progress monitor object to hold the
78 * additional pass count.
79 */
80
81 struct cdjpeg_progress_mgr {
82 struct jpeg_progress_mgr pub; /* fields known to JPEG library */
83 int completed_extra_passes; /* extra passes completed */
84 int total_extra_passes; /* total extra */
85 /* last printed percentage stored here to avoid multiple printouts */
86 int percent_done;
87 };
88
89 typedef struct cdjpeg_progress_mgr * cd_progress_ptr;
90
91
92 /* Short forms of external names for systems with brain-damaged linkers. */
93
94 #ifdef NEED_SHORT_EXTERNAL_NAMES
95 #define jinit_read_bmp jIRdBMP
96 #define jinit_write_bmp jIWrBMP
97 #define jinit_read_gif jIRdGIF
98 #define jinit_write_gif jIWrGIF
99 #define jinit_read_ppm jIRdPPM
100 #define jinit_write_ppm jIWrPPM
101 #define jinit_read_rle jIRdRLE
102 #define jinit_write_rle jIWrRLE
103 #define jinit_read_targa jIRdTarga
104 #define jinit_write_targa jIWrTarga
105 #define read_quant_tables RdQTables
106 #define read_scan_script RdScnScript
107 #define set_quant_slots SetQSlots
108 #define set_sample_factors SetSFacts
109 #define read_color_map RdCMap
110 #define enable_signal_catcher EnSigCatcher
111 #define start_progress_monitor StProgMon
112 #define end_progress_monitor EnProgMon
113 #define read_stdin RdStdin
114 #define write_stdout WrStdout
115 #endif /* NEED_SHORT_EXTERNAL_NAMES */
116
117 /* Module selection routines for I/O modules. */
118
119 EXTERN(cjpeg_source_ptr) jinit_read_bmp JPP((j_compress_ptr cinfo));
120 EXTERN(djpeg_dest_ptr) jinit_write_bmp JPP((j_decompress_ptr cinfo,
121 boolean is_os2));
122 EXTERN(cjpeg_source_ptr) jinit_read_gif JPP((j_compress_ptr cinfo));
123 EXTERN(djpeg_dest_ptr) jinit_write_gif JPP((j_decompress_ptr cinfo));
124 EXTERN(cjpeg_source_ptr) jinit_read_ppm JPP((j_compress_ptr cinfo));
125 EXTERN(djpeg_dest_ptr) jinit_write_ppm JPP((j_decompress_ptr cinfo));
126 EXTERN(cjpeg_source_ptr) jinit_read_rle JPP((j_compress_ptr cinfo));
127 EXTERN(djpeg_dest_ptr) jinit_write_rle JPP((j_decompress_ptr cinfo));
128 EXTERN(cjpeg_source_ptr) jinit_read_targa JPP((j_compress_ptr cinfo));
129 EXTERN(djpeg_dest_ptr) jinit_write_targa JPP((j_decompress_ptr cinfo));
130
131 /* cjpeg support routines (in rdswitch.c) */
132
133 EXTERN(boolean) read_quant_tables JPP((j_compress_ptr cinfo, char * filename,
134 int scale_factor, boolean force_baseline));
135 EXTERN(boolean) read_scan_script JPP((j_compress_ptr cinfo, char * filename));
136 EXTERN(boolean) set_quant_slots JPP((j_compress_ptr cinfo, char *arg));
137 EXTERN(boolean) set_sample_factors JPP((j_compress_ptr cinfo, char *arg));
138
139 /* djpeg support routines (in rdcolmap.c) */
140
141 EXTERN(void) read_color_map JPP((j_decompress_ptr cinfo, FILE * infile));
142
143 /* common support routines (in cdjpeg.c) */
144
145 EXTERN(void) enable_signal_catcher JPP((j_common_ptr cinfo));
146 EXTERN(void) start_progress_monitor JPP((j_common_ptr cinfo,
147 cd_progress_ptr progress));
148 EXTERN(void) end_progress_monitor JPP((j_common_ptr cinfo));
149 EXTERN(boolean) keymatch JPP((char * arg, const char * keyword, int minchars));
150 EXTERN(FILE *) read_stdin JPP((void));
151 EXTERN(FILE *) write_stdout JPP((void));
152
153 /* miscellaneous useful macros */
154
155 #ifdef DONT_USE_B_MODE /* define mode parameters for fopen() */
156 #define READ_BINARY "r"
157 #define WRITE_BINARY "w"
158 #else
159 #ifdef VMS /* VMS is very nonstandard */
160 #define READ_BINARY "rb", "ctx=stm"
161 #define WRITE_BINARY "wb", "ctx=stm"
162 #else /* standard ANSI-compliant case */
163 #define READ_BINARY "rb"
164 #define WRITE_BINARY "wb"
165 #endif
166 #endif
167
168 #ifndef EXIT_FAILURE /* define exit() codes if not provided */
169 #define EXIT_FAILURE 1
170 #endif
171 #ifndef EXIT_SUCCESS
172 #ifdef VMS
173 #define EXIT_SUCCESS 1 /* VMS is very nonstandard */
174 #else
175 #define EXIT_SUCCESS 0
176 #endif
177 #endif
178 #ifndef EXIT_WARNING
179 #ifdef VMS
180 #define EXIT_WARNING 1 /* VMS is very nonstandard */
181 #else
182 #define EXIT_WARNING 2
183 #endif
184 #endif