1 /* Copyright (C) 1994, 1998, 1999 Aladdin Enterprises. All rights reserved.
2
3 This software is provided AS-IS with no warranty, either express or
4 implied.
5
6 This software is distributed under license and may not be copied,
7 modified or distributed except as expressly authorized under the terms
8 of the license contained in the file LICENSE in this distribution.
9
10 For more information about licensing, please refer to
11 http://www.ghostscript.com/licensing/. For information on
12 commercial licensing, go to http://www.artifex.com/licensing/ or
13 contact Artifex Software, Inc., 101 Lucas Valley Road #110,
14 San Rafael, CA 94903, U.S.A., +1(415)492-9861.
15 */
16
17 /* $Id: sjpege.c,v 1.5 2002/02/21 22:24:54 giles Exp $ */
18 /* Interface routines for IJG encoding code. */
19 #include "stdio_.h"
20 #include "string_.h"
21 #include "jpeglib_.h"
22 #include "jerror_.h"
23 #include "gx.h"
24 #include "gserrors.h"
25 #include "strimpl.h"
26 #include "sdct.h"
27 #include "sjpeg.h"
28
29 /*
30 * Interface routines. This layer of routines exists solely to limit
31 * side-effects from using setjmp.
32 */
33
34 int
gs_jpeg_create_compress(stream_DCT_state * st)35 gs_jpeg_create_compress(stream_DCT_state * st)
36 { /* Initialize error handling */
37 gs_jpeg_error_setup(st);
38 /* Establish the setjmp return context for gs_jpeg_error_exit to use. */
39 if (setjmp(st->data.common->exit_jmpbuf))
40 return_error(gs_jpeg_log_error(st));
41
42 jpeg_stream_data_common_init(st->data.compress);
43 jpeg_create_compress(&st->data.compress->cinfo);
44 return 0;
45 }
46
47 int
gs_jpeg_set_defaults(stream_DCT_state * st)48 gs_jpeg_set_defaults(stream_DCT_state * st)
49 {
50 if (setjmp(st->data.common->exit_jmpbuf))
51 return_error(gs_jpeg_log_error(st));
52 jpeg_set_defaults(&st->data.compress->cinfo);
53 return 0;
54 }
55
56 int
gs_jpeg_set_colorspace(stream_DCT_state * st,J_COLOR_SPACE colorspace)57 gs_jpeg_set_colorspace(stream_DCT_state * st,
58 J_COLOR_SPACE colorspace)
59 {
60 if (setjmp(st->data.common->exit_jmpbuf))
61 return_error(gs_jpeg_log_error(st));
62 jpeg_set_colorspace(&st->data.compress->cinfo, colorspace);
63 return 0;
64 }
65
66 int
gs_jpeg_set_linear_quality(stream_DCT_state * st,int scale_factor,boolean force_baseline)67 gs_jpeg_set_linear_quality(stream_DCT_state * st,
68 int scale_factor, boolean force_baseline)
69 {
70 if (setjmp(st->data.common->exit_jmpbuf))
71 return_error(gs_jpeg_log_error(st));
72 jpeg_set_linear_quality(&st->data.compress->cinfo,
73 scale_factor, force_baseline);
74 return 0;
75 }
76
77 int
gs_jpeg_set_quality(stream_DCT_state * st,int quality,boolean force_baseline)78 gs_jpeg_set_quality(stream_DCT_state * st,
79 int quality, boolean force_baseline)
80 {
81 if (setjmp(st->data.common->exit_jmpbuf))
82 return_error(gs_jpeg_log_error(st));
83 jpeg_set_quality(&st->data.compress->cinfo,
84 quality, force_baseline);
85 return 0;
86 }
87
88 int
gs_jpeg_start_compress(stream_DCT_state * st,boolean write_all_tables)89 gs_jpeg_start_compress(stream_DCT_state * st,
90 boolean write_all_tables)
91 {
92 if (setjmp(st->data.common->exit_jmpbuf))
93 return_error(gs_jpeg_log_error(st));
94 jpeg_start_compress(&st->data.compress->cinfo, write_all_tables);
95 return 0;
96 }
97
98 int
gs_jpeg_write_scanlines(stream_DCT_state * st,JSAMPARRAY scanlines,int num_lines)99 gs_jpeg_write_scanlines(stream_DCT_state * st,
100 JSAMPARRAY scanlines,
101 int num_lines)
102 {
103 if (setjmp(st->data.common->exit_jmpbuf))
104 return_error(gs_jpeg_log_error(st));
105 return (int)jpeg_write_scanlines(&st->data.compress->cinfo,
106 scanlines, (JDIMENSION) num_lines);
107 }
108
109 int
gs_jpeg_finish_compress(stream_DCT_state * st)110 gs_jpeg_finish_compress(stream_DCT_state * st)
111 {
112 if (setjmp(st->data.common->exit_jmpbuf))
113 return_error(gs_jpeg_log_error(st));
114 jpeg_finish_compress(&st->data.compress->cinfo);
115 return 0;
116 }
117