//C- -------------------------------------------------------------------
//C- Java DjVu (r) (v. 0.8)
//C- Copyright (c) 2004-2005 LizardTech, Inc. All Rights Reserved.
//C- Java DjVu is protected by U.S. Pat. No.C- 6,058,214 and patents
//C- pending.
//C-
//C- This software is subject to, and may be distributed under, the
//C- GNU General Public License, Version 2. The license should have
//C- accompanied the software or you may obtain a copy of the license
//C- from the Free Software Foundation at http://www.fsf.org .
//C-
//C- The computer code originally released by LizardTech under this
//C- license and unmodified by other parties is deemed "the LIZARDTECH
//C- ORIGINAL CODE." Subject to any third party intellectual property
//C- claims, LizardTech grants recipient a worldwide, royalty-free,
//C- non-exclusive license to make, use, sell, or otherwise dispose of
//C- the LIZARDTECH ORIGINAL CODE or of programs derived from the
//C- LIZARDTECH ORIGINAL CODE in compliance with the terms of the GNU
//C- General Public License. This grant only confers the right to
//C- infringe patent claims underlying the LIZARDTECH ORIGINAL CODE to
//C- the extent such infringement is reasonably necessary to enable
//C- recipient to make, have made, practice, sell, or otherwise dispose
//C- of the LIZARDTECH ORIGINAL CODE (or portions thereof) and not to
//C- any greater extent that may be necessary to utilize further
//C- modifications or combinations.
//C-
//C- The LIZARDTECH ORIGINAL CODE is provided "AS IS" WITHOUT WARRANTY
//C- OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
//C- TO ANY WARRANTY OF NON-INFRINGEMENT, OR ANY IMPLIED WARRANTY OF
//C- MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
//C-
//C- In addition, as a special exception, LizardTech Inc. gives permission
//C- to link the code of this program with the proprietary Java
//C- implementation provided by Sun (or other vendors as well), and
//C- distribute linked combinations including the two. You must obey the
//C- GNU General Public License in all respects for all of the code used
//C- other than the proprietary Java implementation. If you modify this
//C- file, you may extend this exception to your version of the file, but
//C- you are not obligated to do so. If you do not wish to do so, delete
//C- this exception statement from your version.
//C- -------------------------------------------------------------------
//C- Developed by Bill C. Riemers, Foxtrot Technologies Inc. as work for
//C- hire under US copyright laws.
//C- -------------------------------------------------------------------
//
package com.lizardtech.djvu;
import java.io.IOException;
import com.google.gwt.typedarrays.shared.TypedArrays;
import com.google.gwt.typedarrays.shared.Uint8Array;
/**
* This class represents structured wavelette data.
*/
public class IWPixmap
implements Pixmap
{
//~ Static fields/initializers ---------------------------------------------
/** DOCUMENT ME! */
public static final int CRCBfull = 5;
/** DOCUMENT ME! */
public static final int CRCBhalf = 3;
/** DOCUMENT ME! */
public static final int CRCBMode = 1;
/** DOCUMENT ME! */
public static final int CRCBnone = 2;
/** DOCUMENT ME! */
public static final int CRCBnormal = 4;
/** DOCUMENT ME! */
public static final float[][] rgb_to_ycc =
{
{0.304348F, 0.608696F, 0.086956F},
{0.463768F, -0.405797F, -0.057971F},
{-0.173913F, -0.347826F, 0.521739F}
};
//~ Instance fields --------------------------------------------------------
/** DOCUMENT ME! */
protected IWCodec cbcodec = null;
/** DOCUMENT ME! */
protected IWCodec crcodec = null;
/** DOCUMENT ME! */
protected IWCodec ycodec = null;
/** DOCUMENT ME! */
protected IWMap cbmap = null;
/** DOCUMENT ME! */
protected IWMap crmap = null;
/** DOCUMENT ME! */
protected IWMap ymap = null;
/** DOCUMENT ME! */
protected int cbytes = 0;
/** DOCUMENT ME! */
protected int crcb_delay = 10;
/** DOCUMENT ME! */
protected boolean crcb_half = false;
/** DOCUMENT ME! */
protected int cserial = 0;
/** DOCUMENT ME! */
protected int cslice = 0;
//~ Constructors -----------------------------------------------------------
/**
* Creates a new IWPixmap object.
*/
public IWPixmap() {}
//~ Methods ----------------------------------------------------------------
/**
* Query if this is image data.
*
* @return true
*/
@Override
public boolean isImageData()
{
return true;
}
/**
* DOCUMENT ME!
*/
public void close_codec()
{
ycodec = crcodec = cbcodec = null;
cslice = cbytes = cserial = 0;
if(DjVuOptions.COLLECT_GARBAGE)
{
System.gc();
}
}
/**
* Decode this chunk.
*
* @param bs DOCUMENT ME!
*
* @throws IOException DOCUMENT ME!
*/
@Override
public void decode(final CachedInputStream bs)
throws IOException
{
if(ycodec == null)
{
cslice = cserial = 0;
ymap = null;
}
if(bs.read() != cserial)
{
throw new IOException(
"(IWPixmap::decode) Chunk does not bear expected serial number");
}
int nslices = cslice + bs.read();
if(cserial == 0)
{
int major = bs.read();
int minor = bs.read();
if((major & 0x7f) != 1)
{
throw new IOException(
"(IWPixmap::decode) File has been compressed with an incompatible IWCodec");
}
if(minor > 2)
{
throw new IOException(
"(IWPixmap::decode) File has been compressed with a more recent IWCodec");
}
int w = (bs.read() << 8);
w |= bs.read();
int h = (bs.read() << 8);
h |= bs.read();
crcb_delay = 0;
crcb_half = false;
int b = bs.read();
if(minor >= 2)
{
crcb_delay = 0x7f & b;
}
if(minor >= 2)
{
crcb_half = ((0x80 & b) == 0);
}
if((major & 0x80) != 0)
{
crcb_delay = -1;
}
ymap = new IWMap().init(w, h);
ycodec = new IWCodec().init(ymap);
if(crcb_delay >= 0)
{
cbmap = new IWMap().init(w, h);
crmap = new IWMap().init(w, h);
cbcodec = new IWCodec().init(cbmap);
crcodec = new IWCodec().init(crmap);
}
}
ZPCodec zp = new ZPCodec().init(bs);
for(int flag = 1; (flag != 0) && (cslice < nslices); cslice++)
{
flag = ycodec.code_slice(zp);
if((crcodec != null) && (cbcodec != null) && (crcb_delay <= cslice))
{
flag |= cbcodec.code_slice(zp);
flag |= crcodec.code_slice(zp);
}
}
cserial++;
// return nslices;
}
/**
* DOCUMENT ME!
*
* @return DOCUMENT ME!
*/
@Override
public int getHeight()
{
return (ymap != null)
? ymap.ih
: 0;
}
/**
* DOCUMENT ME!
*
* @return DOCUMENT ME!
*/
public GPixmap getPixmap()
{
if(ymap == null)
{
return null;
}
final int w = ymap.iw;
final int h = ymap.ih;
final int pixsep = 4;
final int rowsep = w * pixsep;
Uint8Array bytes = TypedArrays.createUint8Array(h * rowsep);
ymap.image(0, bytes, rowsep, pixsep, false);
if((crmap != null) && (cbmap != null) && (crcb_delay >= 0))
{
cbmap.image(1, bytes, rowsep, pixsep, crcb_half);
crmap.image(2, bytes, rowsep, pixsep, crcb_half);
}
// Convert image to RGB
final GPixmap ppm =
new GPixmap().init(bytes, h, w);
final GPixelReference pixel = ppm.createGPixelReference(0);
for(int i = 0; i < h;)
{
pixel.setOffset(i++, 0);
if((crmap != null) && (cbmap != null) && (crcb_delay >= 0))
{
pixel.YCC_to_RGB(w);
}
else
{
for(int x = w; x-- > 0; pixel.incOffset())
{
pixel.setGray(127 - pixel.getBlue());
}
}
}
return ppm;
}
@Override
public GPixmap getPixmap(
int subsample,
GRect rect,
GPixmap retval)
{
if(ymap == null)
{
return null;
}
if(retval == null)
{
retval = new GPixmap();
}
final int w = rect.width();
final int h = rect.height();
final int pixsep = 4;
final int rowsep = w * pixsep;
final Uint8Array bytes = retval.init(h, w, null).data;
ymap.image(subsample, rect, 0, bytes, rowsep, pixsep, false);
if((crmap != null) && (cbmap != null) && (crcb_delay >= 0))
{
cbmap.image(subsample, rect, 1, bytes, rowsep, pixsep, crcb_half);
crmap.image(subsample, rect, 2, bytes, rowsep, pixsep, crcb_half);
}
final GPixelReference pixel = retval.createGPixelReference(0);
for(int i = 0; i < h;)
{
pixel.setOffset(i++, 0);
if((crmap != null) && (cbmap != null) && (crcb_delay >= 0))
{
pixel.YCC_to_RGB(w);
}
else
{
for(int x = w; x-- > 0; pixel.incOffset())
{
pixel.setGray(127 - bytes.get(pixel.getOffset()));
}
}
}
return retval;
}
/**
* DOCUMENT ME!
*
* @return DOCUMENT ME!
*/
@Override
public int getWidth()
{
return (ymap != null)?ymap.iw:0;
}
/**
* Set the CRCB Delay
*
* @param value the new CRCB delay value.
*
* @return the CRCB delay value
*/
public int setCrcbDelay(int value)
{
if(value >= 0)
{
crcb_delay = value;
}
return crcb_delay;
}
@Override
public int getMemoryUsage() {
int usage = ymap.nb * 2500;
if (cbmap != null)
usage *= 3;
return usage;
}
}
