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/*
* pmreadoptimise.c --
*
* Code for loading mcu (Minimum Code Unit).
* mcu is loaded only if the psv optimisation is enabled (optimize = 1)
*
* Copyright (c) 1994 Kongji Huang and Brian C. Smith.
* Cornell University
* All rights reserved.
*
* Copyright (c) 1997 OSIRIS Team. Digital Imaging Unit
* University Hospital of Geneva
* changes made by David Bandon
* All rights reserved
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose, without fee, and without written agreement is
* hereby granted, provided that the above copyright notice and the following
* two paragraphs appear in all copies of this software.
*
* IN NO EVENT SHALL CORNELL UNIVERSITY BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF CORNELL
* UNIVERSITY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* CORNELL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND CORNELL UNIVERSITY HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/
#include <stdio.h>
#include "JPEG.H"
#include "MCU.H"
#include "PROTO.H"
#include "JPEGLESS.H"
#include "IO.H"
/* Papyrus 3 redefined basic types */
#ifndef FILENAME83 /* this is for the normal machines ... */
#ifndef PapyEalloc3H
#include "PapyEalloc3.h"
#endif
#ifndef PapyFileSystem3H
#include "PapyFileSystem3.h"
#endif
#else /* FILENAME83 defined for the DOS machines */
#ifndef PapyEalloc3H
#include "Papaloc3.h"
#endif
#ifndef PapyFileSystem3H
#include "PapFSys3.h"
#endif
#endif
#define PM_MAXVAL 65536
int readimBufferOffset = 0;
/*
*--------------------------------------------------------------
*
* PmRead --
*
* Read the source image file pointed by inFile.
*
* Results:
* Source image parameters such as width, height, sample
* precision and number of color components are passed
* out by enInfo.
*
* Side effects:
* Source image is read into mcuTable, input image size
* is counted in inputFileBytes.
*
*--------------------------------------------------------------
*/
void
PmRead (CompressInfo *enInfo, int optimi)
{
int maxMcu;
JpegComponentInfo *compPtr;
int ci, i, j, c;
MCU mcu;
/*
* Initialize inputFileBytes to 2 bytes since magic number is 2 bytes.
* Read magic number, cols, rows, and max color level. Convert the
* color level to precision bits.
*/
inputFileBytes=0;
enInfo->numComponents = 1; /* Be careful: image must be grayscale */
enInfo->compInfo = (JpegComponentInfo *) emalloc3 (enInfo->numComponents * sizeof (JpegComponentInfo));
/*
* Because JPEG standard (DIS) defined downsampling, in our
* CompressInfo structure, we have sampling factor and an
* index array MCUmembership, in case a MCU contains several
* samples of one color component. But in lossless JPEG, one
* normally don't use downsampling.
*/
for (ci = 0; ci < enInfo->numComponents; ci++)
{
compPtr = &(enInfo->compInfo[ci]);
compPtr->componentId = ci;
compPtr->componentIndex = ci;
compPtr->hSampFactor = 1;
compPtr->vSampFactor = 1;
}
/*
* Set curCompInfo equal to compInfo since these is only
* one scan.
*/
enInfo->compsInScan = enInfo->numComponents;
for (ci = 0; ci < enInfo->compsInScan; ci++)
{
enInfo->curCompInfo[ci] = &(enInfo->compInfo[ci]);
}
/*
* Prepare array indexing MCU components into curCompInfo.
*/
if (enInfo->compsInScan == 1) { enInfo->MCUmembership [0] = 0; }
else
{
if (enInfo->compsInScan > 4)
{
return; /* MAL exit(-1); */
}
for (ci = 0; ci < enInfo->compsInScan; ci++)
{
enInfo->MCUmembership [ci] = ci;
}
} /* else */
/*
* Alloc mcuTable. Read source image into the table.
* Apply point transform if Pt!=0. Update the input
* file size - inputFileBytes.
*/
/* really needed some initialization of these @!?! global variables ... */
numMCU = 0;
readimBufferOffset = 0;
maxMcu = enInfo->imageWidth * enInfo->imageHeight;
inputFileBytes = 0;
/* if the psv optimisation is enabled, mcu is loaded */
if (optimi == 1)
{
InitMcuTable (maxMcu, enInfo->compsInScan);
for (i = 0; i < maxMcu; i++)
{
mcu = MakeMCU ();
for (j = 0; j < enInfo->compsInScan; j++)
{
if (enInfo->dataPrecision == 8)
mcu [j] = (Ushort) readimBuffer [readimBufferOffset++];
else
mcu [j] = (Ushort) readim16Buffer [readimBufferOffset++];
c = (int)mcu [j]; /* unix compatibility */
if ( c == EOF ) { return; }
if (enInfo->Pt != 0) { mcu[j] >>= enInfo->Pt; }
} /* end for j */
} /* end for i */
} /* end if optimi */
if (enInfo->dataPrecision == 8)
inputFileBytes += maxMcu * enInfo->compsInScan;
else
inputFileBytes += maxMcu * enInfo->compsInScan * 2;
} /* end of function PmRead */
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