126 lines
4.4 KiB
C
126 lines
4.4 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: iljpgencodeint.h /main/3 1995/10/23 15:56:34 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 ILJPGENCODEINT_H
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#define ILJPGENCODEINT_H
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#ifndef ILJPGENCODE_H
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#include "iljpgencode.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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/* Private data for encoding JPEG (not JIF), e.g.
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_iljpgEncodeInit/Execute/Cleanup().
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*/
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typedef struct {
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float *pScale; /* from DCTScaleTables[] */
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int horiFactor, vertFactor; /* copied from iljpgDataRec */
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long width, height; /* size of input 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 fetch next MCU */
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int lastDC; /* DC from previous 8x8 block */
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} iljpgECompRec, *iljpgECompPtr;
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typedef struct {
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iljpgDataPtr pData; /* data passed to _iljpgEncodeInit() */
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float *DCTScaleTables[4]; /* owned by iljpgendct.c */
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iljpgPtr pHuffPriv; /* owned by iljpgenhuff.c */
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iljpgECompRec compData[ILJPG_MAX_COMPS]; /* owned by iljpgencode.c */
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} iljpgEncodePrivRec, *iljpgEncodePrivPtr;
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/* Called by iljpgEncodeInit() to scale the Q table pointed to by "pSrc"
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into "pDst", each a 64 entry table.
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*/
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ILJPG_PRIVATE_EXTERN
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iljpgError _iljpgEnDCTScale (
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iljpgPtr pSrc,
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float *pDst
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);
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/* DCT encode the 64 int matrix pointed to by "pSrc", storing the results back
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into the same matrix. "pScale" must point to the 64 float scaled/clipped
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Q table, as setup by _iljpgEnDCTInit().
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*/
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ILJPG_PRIVATE_EXTERN
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_iljpgEnDCT (
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int *pSrc,
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float *pScale
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);
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/* Called by iljpgEncodeInit() to init for Huffman encoding.
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*/
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ILJPG_PRIVATE_EXTERN
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iljpgError _iljpgEnhuffInit (
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iljpgEncodePrivPtr pPriv
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);
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/* Called by iljpgEncodeCleanup() to cleanup after Huffman encoding.
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*/
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ILJPG_PRIVATE_EXTERN
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iljpgError _iljpgEnhuffCleanup (
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iljpgEncodePrivPtr pPriv
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);
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/* Huffman encode an 8x8 block (already zig-zagged) from "pSrc" (array of
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64 ints) out to "stream", for component index "comp". The DC component
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(pSrc[0]) must have already had the lastDC value subtracted from it.
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*/
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ILJPG_PRIVATE_EXTERN
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iljpgError _iljpgEnhuffExecute (
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iljpgEncodePrivPtr pPriv,
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int comp,
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int *pSrc,
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ILJPG_ENCODE_STREAM stream
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);
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/* Flush out any bits left over from Huffman encoding.
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*/
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ILJPG_PRIVATE_EXTERN
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iljpgError _iljpgEnhuffFlush (
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iljpgEncodePrivPtr pPriv,
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ILJPG_ENCODE_STREAM stream
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);
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#endif
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