142 lines
4.7 KiB
C
142 lines
4.7 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: iljpgdecodeint.h /main/3 1995/10/23 15:54:54 rswiston $ */
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/**---------------------------------------------------------------------
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***
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*** (c)Copyright 1992 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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#ifndef ILJPGDECODEINT_H
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#define ILJPGDECODEINT_H
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#ifndef ILJPGDECODE_H
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#include "iljpgdecode.h"
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#endif
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#ifndef ILJPGINT_H
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#include "iljpgint.h"
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#endif
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/* Codes returned from _iljpgHuffmanDecode() indicating which coefficients
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of the 8x8 block are non-zero.
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*/
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#define HUFF_DC_ONLY 0 /* only DCT non-zero */
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#define HUFF_FOURX4 1 /* only top-left 4x4 matrix non-zero */
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#define HUFF_FULL 2 /* "whole" 8x8 non-zero */
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/* Private data for decoding JPEG (not JIF), e.g.
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_iljpgDecodeInit/Execute/Cleanup().
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*/
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typedef struct {
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float *pRevScale; /* built from DCT Q table */
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int horiFactor, vertFactor; /* copied from iljpgDataRec */
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long width, height; /* size of output buffer */
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int mcuXInc, mcuYInc; /* value to inc (x,y) by, each MCU */
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long x, y; /* where to store next MCU */
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int lastDC; /* DC from previous 8x8 block */
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} iljpgCompRec, *iljpgCompPtr;
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typedef struct {
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iljpgDataPtr pData; /* data passed to _iljpgDecodeInit() */
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int mcuRestartCount; /* # of mcu's since last restart */
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iljpgPtr pHuffPriv; /* owned by iljpgdehuff.c */
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float *DCTRevScaleTables[4]; /* owned by iljpgdedct.c */
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iljpgCompRec compData[ILJPG_MAX_COMPS]; /* owned by iljpgdecode.c */
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} iljpgDecodePrivRec, *iljpgDecodePrivPtr;
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/* Functions in iljpgdehuff.c */
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ILJPG_PRIVATE_EXTERN
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iljpgError _iljpgDehuffInit (
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iljpgDecodePrivPtr pPriv
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);
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ILJPG_PRIVATE_EXTERN
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iljpgError _iljpgDehuffCleanup (
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iljpgDecodePrivPtr pPriv
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);
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ILJPG_PRIVATE_EXTERN
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iljpgError _iljpgDehuffReset (
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iljpgDecodePrivPtr pPriv
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);
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ILJPG_PRIVATE_EXTERN
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iljpgError _iljpgDehuffExecute (
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iljpgDecodePrivPtr pPriv,
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ILJPG_DECODE_STREAM stream,
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int comp,
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int *pOut,
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unsigned int *pBlockType
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);
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/* Functions in iljpgdedct.c */
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ILJPG_PRIVATE_EXTERN
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iljpgError _iljpgDeDCTInit (
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iljpgDecodePrivPtr pPriv
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);
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ILJPG_PRIVATE_EXTERN
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iljpgError _iljpgDeDCTCleanup (
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iljpgDecodePrivPtr pPriv
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);
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ILJPG_PRIVATE_EXTERN
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void _iljpgDeDCTFull (
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int *pSrc,
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long nBytesPerRow,
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iljpgPtr ix, /* RETURNED */
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float *pRevScale
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);
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ILJPG_PRIVATE_EXTERN
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void _iljpgDeDCT4x4 (
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int *pSrc,
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long nBytesPerRow,
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iljpgPtr ix, /* RETURNED */
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float *pRevScale
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);
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ILJPG_PRIVATE_EXTERN
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void _iljpgDeDCTDCOnly (
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int *pSrc,
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long nBytesPerRow,
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iljpgPtr pDst, /* RETURNED */
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float *pRevScale
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);
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#endif
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