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Java Advanced Imaging Image I/O Tools API core, but without the classes
involved with javax.media.jai dependencies, JPEG2000 or
codecLibJIIO, meaning that this library can be distributed under the
modified BSD license and should be GPL compatible.
The newest version!
/*
* $RCSfile: WBMPImageReader.java,v $
*
*
* Copyright (c) 2005 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any
* kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
* WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
* EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL
* NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF
* USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
* DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR
* ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
* CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
* REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
* INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for
* use in the design, construction, operation or maintenance of any
* nuclear facility.
*
* $Revision: 1.2 $
* $Date: 2006/04/21 00:02:26 $
* $State: Exp $
*/
package com.github.jaiimageio.impl.plugins.wbmp;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferByte;
import java.awt.image.MultiPixelPackedSampleModel;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import javax.imageio.IIOException;
import javax.imageio.ImageReadParam;
import javax.imageio.ImageReader;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.spi.ImageReaderSpi;
import javax.imageio.stream.ImageInputStream;
import com.github.jaiimageio.impl.common.ImageUtil;
/** This class is the Java Image IO plugin reader for WBMP images.
* It may subsample the image, clip the image,
* and shift the decoded image origin if the proper decoding parameter
* are set in the provided WBMPImageReadParam.
*/
public class WBMPImageReader extends ImageReader {
/** The input stream where reads from */
private ImageInputStream iis = null;
/** Indicates whether the header is read. */
private boolean gotHeader = false;
/** The stream position where the image data starts. */
private long imageDataOffset;
/** The original image width. */
private int width;
/** The original image height. */
private int height;
private int wbmpType;
private WBMPMetadata metadata;
/** Constructs WBMPImageReader from the provided
* ImageReaderSpi.
*/
public WBMPImageReader(ImageReaderSpi originator) {
super(originator);
}
/** Overrides the method defined in the superclass. */
public void setInput(Object input,
boolean seekForwardOnly,
boolean ignoreMetadata) {
super.setInput(input, seekForwardOnly, ignoreMetadata);
iis = (ImageInputStream) input; // Always works
gotHeader = false;
}
/** Overrides the method defined in the superclass. */
public int getNumImages(boolean allowSearch) throws IOException {
if (iis == null) {
throw new IllegalStateException(I18N.getString("GetNumImages0"));
}
if (seekForwardOnly && allowSearch) {
throw new IllegalStateException(I18N.getString("GetNumImages1"));
}
return 1;
}
public int getWidth(int imageIndex) throws IOException {
checkIndex(imageIndex);
readHeader();
return width;
}
public int getHeight(int imageIndex) throws IOException {
checkIndex(imageIndex);
readHeader();
return height;
}
public boolean isRandomAccessEasy(int imageIndex) throws IOException {
checkIndex(imageIndex);
return true;
}
private void checkIndex(int imageIndex) {
if (imageIndex != 0) {
throw new IndexOutOfBoundsException(I18N.getString("WBMPImageReader0"));
}
}
public void readHeader() throws IOException {
if (gotHeader) {
// Seek to where the image data starts, since that is where
// the stream pointer should be after header is read
iis.seek(imageDataOffset);
return;
}
if (iis == null) {
throw new IllegalStateException(I18N.getString("WBMPImageReader1"));
}
metadata = new WBMPMetadata();
wbmpType = iis.readByte(); // TypeField
byte fixHeaderField = iis.readByte();
// check for valid wbmp image
if (fixHeaderField != 0
|| !isValidWbmpType(wbmpType)) {
throw new IIOException(I18N.getString("WBMPImageReader2"));
}
metadata.wbmpType = wbmpType;
// Read image width
width = ImageUtil.readMultiByteInteger(iis);
metadata.width = width;
// Read image height
height = ImageUtil.readMultiByteInteger(iis);
metadata.height = height;
gotHeader = true;
// Store the stream position where the image data starts
imageDataOffset = iis.getStreamPosition();
}
public Iterator getImageTypes(int imageIndex)
throws IOException {
checkIndex(imageIndex);
readHeader();
BufferedImage bi =
new BufferedImage(1, 1, BufferedImage.TYPE_BYTE_BINARY);
ArrayList list = new ArrayList(1);
list.add(new ImageTypeSpecifier(bi));
return list.iterator();
}
public ImageReadParam getDefaultReadParam() {
return new ImageReadParam();
}
public IIOMetadata getImageMetadata(int imageIndex)
throws IOException {
checkIndex(imageIndex);
if (metadata == null) {
readHeader();
}
return metadata;
}
public IIOMetadata getStreamMetadata() throws IOException {
return null;
}
public BufferedImage read(int imageIndex, ImageReadParam param)
throws IOException {
if (iis == null) {
throw new IllegalStateException(I18N.getString("WBMPImageReader1"));
}
checkIndex(imageIndex);
clearAbortRequest();
processImageStarted(imageIndex);
if (param == null)
param = getDefaultReadParam();
//read header
readHeader();
Rectangle sourceRegion = new Rectangle(0, 0, 0, 0);
Rectangle destinationRegion = new Rectangle(0, 0, 0, 0);
computeRegions(param, this.width, this.height,
param.getDestination(),
sourceRegion,
destinationRegion);
int scaleX = param.getSourceXSubsampling();
int scaleY = param.getSourceYSubsampling();
int xOffset = param.getSubsamplingXOffset();
int yOffset = param.getSubsamplingYOffset();
// If the destination is provided, then use it. Otherwise, create new one
BufferedImage bi = param.getDestination();
if (bi == null)
bi = new BufferedImage(destinationRegion.x + destinationRegion.width,
destinationRegion.y + destinationRegion.height,
BufferedImage.TYPE_BYTE_BINARY);
boolean noTransform =
destinationRegion.equals(new Rectangle(0, 0, width, height)) &&
destinationRegion.equals(new Rectangle(0, 0, bi.getWidth(), bi.getHeight()));
// Get the image data.
WritableRaster tile = bi.getWritableTile(0, 0);
// Get the SampleModel.
MultiPixelPackedSampleModel sm =
(MultiPixelPackedSampleModel)bi.getSampleModel();
if (noTransform) {
if (abortRequested()) {
processReadAborted();
return bi;
}
// If noTransform is necessary, read the data.
iis.read(((DataBufferByte)tile.getDataBuffer()).getData(),
0, height*sm.getScanlineStride());
processImageUpdate(bi,
0, 0,
width, height, 1, 1,
new int[]{0});
processImageProgress(100.0F);
} else {
int len = (this.width + 7) / 8;
byte[] buf = new byte[len];
byte[] data = ((DataBufferByte)tile.getDataBuffer()).getData();
int lineStride = sm.getScanlineStride();
iis.skipBytes(len * sourceRegion.y);
int skipLength = len * (scaleY - 1);
// cache the values to avoid duplicated computation
int[] srcOff = new int[destinationRegion.width];
int[] destOff = new int[destinationRegion.width];
int[] srcPos = new int[destinationRegion.width];
int[] destPos = new int[destinationRegion.width];
for (int i = destinationRegion.x, x = sourceRegion.x, j = 0;
i < destinationRegion.x + destinationRegion.width;
i++, j++, x += scaleX) {
srcPos[j] = x >> 3;
srcOff[j] = 7 - (x & 7);
destPos[j] = i >> 3;
destOff[j] = 7 - (i & 7);
}
for (int j = 0, y = sourceRegion.y,
k = destinationRegion.y * lineStride;
j < destinationRegion.height; j++, y+=scaleY) {
if (abortRequested())
break;
iis.read(buf, 0, len);
for (int i = 0; i < destinationRegion.width; i++) {
//get the bit and assign to the data buffer of the raster
int v = (buf[srcPos[i]] >> srcOff[i]) & 1;
data[k + destPos[i]] |= v << destOff[i];
}
k += lineStride;
iis.skipBytes(skipLength);
processImageUpdate(bi,
0, j,
destinationRegion.width, 1, 1, 1,
new int[]{0});
processImageProgress(100.0F*j/destinationRegion.height);
}
}
if (abortRequested())
processReadAborted();
else
processImageComplete();
return bi;
}
public boolean canReadRaster() {
return true;
}
public Raster readRaster(int imageIndex,
ImageReadParam param) throws IOException {
BufferedImage bi = read(imageIndex, param);
return bi.getData();
}
public void reset() {
super.reset();
iis = null;
gotHeader = false;
}
/*
* This method verifies that given byte is valid wbmp type marker.
* At the moment only 0x0 marker is described by wbmp spec.
*/
boolean isValidWbmpType(int type) {
return type == 0;
}
}