2 * CDE - Common Desktop Environment
4 * Copyright (c) 1993-2012, The Open Group. All rights reserved.
6 * These libraries and programs are free software; you can
7 * redistribute them and/or modify them under the terms of the GNU
8 * Lesser General Public License as published by the Free Software
9 * Foundation; either version 2 of the License, or (at your option)
12 * These libraries and programs are distributed in the hope that
13 * they will be useful, but WITHOUT ANY WARRANTY; without even the
14 * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
15 * PURPOSE. See the GNU Lesser General Public License for more
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with these librararies and programs; if not, write
20 * to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
21 * Floor, Boston, MA 02110-1301 USA
23 /* $XConsortium: iljpgencodedefs.h /main/3 1995/10/23 15:56:20 rswiston $ */
24 /**---------------------------------------------------------------------
26 *** (c)Copyright 1992 Hewlett-Packard Co.
28 *** RESTRICTED RIGHTS LEGEND
29 *** Use, duplication, or disclosure by the U.S. Government is subject to
30 *** restrictions as set forth in sub-paragraph (c)(1)(ii) of the Rights in
31 *** Technical Data and Computer Software clause in DFARS 252.227-7013.
32 *** Hewlett-Packard Company
33 *** 3000 Hanover Street
34 *** Palo Alto, CA 94304 U.S.A.
35 *** Rights for non-DOD U.S. Government Departments and Agencies are as set
36 *** forth in FAR 52.227-19(c)(1,2).
38 ***-------------------------------------------------------------------*/
41 #ifndef ILJPGENCODEDEFS_H
42 #define ILJPGENCODEDEFS_H
47 /* Equate ILJPG errors to IL errors */
48 #define ILJPG_ERROR_ENCODE_MALLOC IL_ERROR_MALLOC
49 #define ILJPG_ERROR_ENCODE_PARS IL_ERROR_COMPRESSED_DATA
50 #define ILJPG_ERROR_ENCODE_DCAC_TABLE IL_ERROR_COMPRESSED_DATA
51 #define ILJPG_ERROR_ENCODE_Q_TABLE IL_ERROR_COMPRESSED_DATA
54 /* Define a JPEG stream: "pBuffer" points to a buffer in
55 memory, "pPastEndBuffer" points to byte just past end
56 (buffer is of size "pPastEndBuffer" - "pBuffer") and
57 pDst points to the place to store the next byte.
63 } ilJPEGEncodeStream, *ilJPEGEncodeStreamPtr;
65 #define ILJPG_ENCODE_STREAM ilJPEGEncodeStreamPtr
68 /* Called by ILJPG_ENCODE_PUT_BYTE() macro to reallocate the buffer
69 defined by "pStream" so that there is space for *exactly* "nBytes" bytes
70 to be written. Zero (0) is returned if success else an error code.
72 IL_EXTERN iljpgError _ilReallocJPEGEncode (
73 ilJPEGEncodeStreamPtr pStream,
78 /* # of bytes by which to expand the size of the output buffer
79 when realloc'ing to write one byte. NOTE: must be >= 1!
81 #define ILJPG_REALLOC_EXTRA 1024
83 /* Macro to put a byte to a stream. Return one (1) from macro
84 if success, else return zero (0) and set "_error" to a
87 #define ILJPG_ENCODE_PUT_BYTE(_stream, _byte, _error) ( \
88 ((_stream)->pDst >= (_stream)->pPastEndBuffer) ? \
89 ((_error = _ilReallocJPEGEncode (_stream, ILJPG_REALLOC_EXTRA)) ? 0 : \
90 (*(_stream)->pDst++ = _byte, 1)) : \
91 (*(_stream)->pDst++ = _byte, 1) )
93 /* Macro to return position within dst buffer, like ftell() */
94 #define ILJPG_ENCODE_OFFSET(_stream) \
95 ((_stream)->pDst - (_stream)->pBuffer)