137 lines
5.2 KiB
C
137 lines
5.2 KiB
C
/*
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* CDE - Common Desktop Environment
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*
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* Copyright (c) 1993-2012, The Open Group. All rights reserved.
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*
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* These libraries and programs are free software; you can
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* redistribute them and/or modify them under the terms of the GNU
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* Lesser General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* These libraries and programs are distributed in the hope that
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* they will be useful, but WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU Lesser General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with these libraries and programs; if not, write
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* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
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* Floor, Boston, MA 02110-1301 USA
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*/
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/* $XConsortium: ilcompress.c /main/3 1995/10/23 15:42:52 rswiston $ */
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/**---------------------------------------------------------------------
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***
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*** (c)Copyright 1991 Hewlett-Packard Co.
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***
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*** RESTRICTED RIGHTS LEGEND
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*** Use, duplication, or disclosure by the U.S. Government is subject to
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*** restrictions as set forth in sub-paragraph (c)(1)(ii) of the Rights in
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*** Technical Data and Computer Software clause in DFARS 252.227-7013.
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*** Hewlett-Packard Company
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*** 3000 Hanover Street
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*** Palo Alto, CA 94304 U.S.A.
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*** Rights for non-DOD U.S. Government Departments and Agencies are as set
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*** forth in FAR 52.227-19(c)(1,2).
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***
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***-------------------------------------------------------------------*/
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#include "ilint.h"
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#include "ilpipelem.h"
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#include "ilcompress.h"
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#include "ilcodec.h"
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#include "ilerrors.h"
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/* --------------------------- ilCompress ----------------------------------- */
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/* Public function; see spec.
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Forces pipe data to be compressed with the given "compression", in constant
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strips. If "dstStripHeight" is zero (0), then any stripHeight is allowable,
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but if compression is done, it is done with the default strip height.
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*/
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ilBool ilCompress (
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ilPipe pipe,
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unsigned int compression,
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ilPtr pCompData,
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long dstStripHeight,
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unsigned long mustBeZero
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)
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{
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unsigned int state;
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ilPipeInfo info;
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ilImageDes des;
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ilImageFormat format;
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ilSrcElementData srcData;
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ilBool correct;
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if (ilGetPipeInfo (pipe, FALSE, &info, &des, &format) != IL_PIPE_FORMING)
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if (!pipe->context->error)
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return ilDeclarePipeInvalid (pipe, IL_ERROR_PIPE_STATE);
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if (mustBeZero != 0)
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return ilDeclarePipeInvalid(pipe, IL_ERROR_PAR_NOT_ZERO);
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/* Force requested strip height to image height if greater. */
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if (dstStripHeight > info.height)
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dstStripHeight = info.height;
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/* Check current pipe image and force decompression if wrong compression, or
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inconstant strip height, or not requested (non-zero) strip height.
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*/
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if ((des.compression != compression)
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|| (dstStripHeight && (info.stripHeight != dstStripHeight))
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|| !info.constantStrip)
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ilGetPipeInfo (pipe, TRUE, &info, &des, &format); /* decompress */
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/* Specify the input (and therefore the output) strip height: if dstStripHeight
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is zero, take default, otherwise requested, always constant strips.
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*/
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if (dstStripHeight <= 0)
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dstStripHeight = ilRecommendedStripHeight (&des, &format, info.width, info.height);
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srcData.consumerImage = (ilObject)NULL;
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srcData.minBufferHeight = 0;
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srcData.stripHeight = dstStripHeight;
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srcData.constantStrip = TRUE;
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/* Pipe image is now correct compression or is uncompressed. For compression
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types which have no variants, exit if already requested compression; for
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types with variant, call compression-specific code to check variant.
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*/
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switch (compression) {
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case IL_UNCOMPRESSED: /* image now uncompressed; skip */
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break;
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case IL_G3: /* check G3 variants */
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return _ilCompressG3 (pipe, &info, &des, &format, &srcData, pCompData);
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break;
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case IL_JPEG: /* check JPEG variants */
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return _ilCompressJPEG (pipe, &info, &des, &format, &srcData, pCompData);
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break;
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case IL_G4: /* check G4 variants */
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return _ilCompressG4 (pipe, &info, &des, &format, &srcData, pCompData);
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break;
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case IL_LZW:
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if (des.compression != IL_LZW)
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return _ilCompressLZW (pipe, &info, &des, &format, &srcData);
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break;
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case IL_PACKBITS:
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if (des.compression != IL_PACKBITS)
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return _ilCompressPackbits (pipe, &info, &des, &format, &srcData);
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break;
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default:
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return ilDeclarePipeInvalid (pipe, IL_ERROR_COMPRESSION);
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}
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/* No (re)compression needed; exit with success */
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pipe->context->error = IL_OK;
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return TRUE;
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}
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