208 lines
8.7 KiB
C
208 lines
8.7 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: ildecomppackbits.c /main/5 1996/06/19 12:23:29 ageorge $ */
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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 "ildecomp.h"
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#include "ilerrors.h"
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/* ========================================================================
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Decompression private data structure definition
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======================================================================== */
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typedef struct {
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long height;
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long width;
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long nDstLineBytes;
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} ilDecompPBPrivRec, *ilDecompPBPrivPtr;
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/* =============================================================================================================================
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-------------------- ilDecompPackbitsExecute() -------------------
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Routine defined in ilDecompPackbits for executing Packbits
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decompression when the pipe gets executed.
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============================================================================================================================= */
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static ilError ilDecompPackbitsExecute(
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ilExecuteData *pData,
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unsigned long dstLine,
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unsigned long *pNLines
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)
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{
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unsigned long dstNBytes; /* Number of destination image bytes per row */
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long nLines; /* Number of lines per source image strip */
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long nBytesToGo; /* Number of source image bytes left to unpack for current strip */
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long nDstLineBytesToGo; /* Number of bytes left to write to this line of destination */
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ilPtr pSrcByte; /* Pointer to source image data */
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ilPtr pDstByte; /* Pointer to destination image data first byte */
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ilPtr pSrcLine; /* Pointer to source image data first byte of each scanline */
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ilPtr pDstLine; /* Pointer to destination image data first byte of each scanline */
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ilDecompPBPrivPtr pPriv; /* Pointer to private image data */
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ilImagePlaneInfo *pPlane;
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int count; /* run-length code value */
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ilByte repeatbyte; /* repeated data */
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/* ========================================================================
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ilDecompPackbitsExecute() set up for decompression algorithm code
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======================================================================== */
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pPriv = (ilDecompPBPrivPtr) pData->pPrivate;
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nLines = *pNLines;
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if (nLines <= 0) return IL_OK;
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nBytesToGo = pData->compressed.nBytesToRead;
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if (nBytesToGo <= 0) return IL_OK;
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pPlane = &pData->pSrcImage->plane[0];
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if (!pPlane->pPixels) return IL_ERROR_NULL_COMPRESSED_IMAGE;
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pSrcLine = pPlane->pPixels + pData->compressed.srcOffset;
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pPlane = &pData->pDstImage->plane[0];
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if (!pPlane->pPixels) return IL_ERROR_NULL_COMPRESSED_IMAGE;
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dstNBytes = pPlane->nBytesPerRow;
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pDstLine = pPlane->pPixels + dstLine * dstNBytes;
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pSrcByte = pSrcLine;
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/* decode each line of compressed data into the destination image */
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while (nLines-- > 0) {
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pDstByte = pDstLine;
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nDstLineBytesToGo = pPriv->nDstLineBytes;
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while (nDstLineBytesToGo > 0) {
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if (--nBytesToGo < 0)
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return IL_ERROR_COMPRESSED_DATA;
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count = (signed char)*pSrcByte++;
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if (count >= 0) {
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count++;
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nDstLineBytesToGo -= count;
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nBytesToGo -= count;
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if ((nDstLineBytesToGo < 0) || (nBytesToGo < 0))
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return IL_ERROR_COMPRESSED_DATA;
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count--;
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do {
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*pDstByte++ = *pSrcByte++;
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} while (--count >= 0);
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}
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else if (count != 128) { /* 128 is a noop for Packbits */
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count = -count; /* count is now -1 of real count */
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nDstLineBytesToGo -= (count + 1);
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nBytesToGo--;
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if ((nDstLineBytesToGo < 0) || (nBytesToGo < 0))
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return IL_ERROR_COMPRESSED_DATA;
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repeatbyte = *pSrcByte++;
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do {
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*pDstByte++ = repeatbyte;
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} while (--count >= 0);
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}
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} /* end row */
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pDstLine += dstNBytes;
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} /* end strip */
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return IL_OK;
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}
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/* =============================================================================================================================
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-------------------- ilDecompPackbits() --------------------
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Main body of code for Packbits decompression. This includes image descriptor parameter error checking
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and function calls for: strip handler initialization, adding the filter element to the pipe, pipe initialization
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and execution, decompression algorithm.....
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============================================================================================================================= */
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IL_PRIVATE ilBool _ilDecompPackbits (
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ilPipe pipe,
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ilPipeInfo *pinfo,
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ilImageDes *pimdes,
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ilImageFormat *pimformat
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)
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{
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ilDstElementData dstdata;
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ilDecompPBPrivPtr pPriv;
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ilImageDes des;
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ilBool bitPerPixel;
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/* If image has more than one sample/pixel or is not bit or byte/pixel, error */
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bitPerPixel = (pimformat->nBitsPerSample[0] == 1);
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if ((pimdes->nSamplesPerPixel != 1)
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|| (!bitPerPixel && (pimformat->nBitsPerSample[0] != 8)))
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return ilDeclarePipeInvalid (pipe, IL_ERROR_IMAGE_TYPE);
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dstdata.producerObject = (ilObject) NULL;
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des = *pimdes;
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des.compression = IL_UNCOMPRESSED;
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dstdata.pDes = &des;
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dstdata.width = pinfo->width;
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dstdata.height = pinfo->height;
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dstdata.pPalette = pinfo->pPalette;
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dstdata.pCompData = (ilPtr)NULL;
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dstdata.stripHeight = pinfo->stripHeight;
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dstdata.constantStrip = pinfo->constantStrip;
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dstdata.pFormat = (bitPerPixel) ? IL_FORMAT_BIT : IL_FORMAT_BYTE;
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pPriv = (ilDecompPBPrivPtr) ilAddPipeElement(pipe, IL_FILTER, sizeof(ilDecompPBPrivRec), 0,
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(ilSrcElementData *)NULL, &dstdata,
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IL_NPF, IL_NPF, IL_NPF, ilDecompPackbitsExecute, NULL, 0);
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if (!pPriv)
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return FALSE;
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pPriv->height = pinfo->height;
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pPriv->width = pinfo->width;
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pPriv->nDstLineBytes = (bitPerPixel) ? (pPriv->width + 7) / 8 : pPriv->width;
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return TRUE;
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}
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