Back to index...

	/*
	* Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package com.sun.imageio.plugins.wbmp;

	import java.awt.Point;
	import java.awt.Rectangle;
	import java.awt.image.ColorModel;
	import java.awt.image.DataBuffer;
	import java.awt.image.DataBufferByte;
	import java.awt.image.IndexColorModel;
	import java.awt.image.MultiPixelPackedSampleModel;
	import java.awt.image.Raster;
	import java.awt.image.RenderedImage;
	import java.awt.image.SampleModel;
	import java.awt.image.WritableRaster;

	import java.io.IOException;

	import javax.imageio.IIOImage;
	import javax.imageio.IIOException;
	import javax.imageio.ImageTypeSpecifier;
	import javax.imageio.ImageWriteParam;
	import javax.imageio.ImageWriter;
	import javax.imageio.metadata.IIOMetadata;
	import javax.imageio.metadata.IIOMetadataFormatImpl;
	import javax.imageio.metadata.IIOInvalidTreeException;
	import javax.imageio.spi.ImageWriterSpi;
	import javax.imageio.stream.ImageOutputStream;

	import com.sun.imageio.plugins.common.I18N;

	/**
	* The Java Image IO plugin writer for encoding a binary RenderedImage into
	* a WBMP format.
	*
	* The encoding process may clip, subsample using the parameters
	* specified in the <code>ImageWriteParam</code>.
	*
	* @see com.sun.media.imageio.plugins.WBMPImageWriteParam
	*/
	public class WBMPImageWriter extends ImageWriter {
	/** The output stream to write into */
	private ImageOutputStream stream = null;

	// Get the number of bits required to represent an int.
	private static int getNumBits(int intValue) {
	int numBits = 32;
	int mask = 0x80000000;
	while(mask != 0 && (intValue & mask) == 0) {
	numBits--;
	mask >>>= 1;
	}
	return numBits;
	}

	// Convert an int value to WBMP multi-byte format.
	private static byte[] intToMultiByte(int intValue) {
	int numBitsLeft = getNumBits(intValue);
	byte[] multiBytes = new byte[(numBitsLeft + 6)/7];

	int maxIndex = multiBytes.length - 1;
	for(int b = 0; b <= maxIndex; b++) {
	multiBytes[b] = (byte)((intValue >>> ((maxIndex - b)*7))&0x7f);
	if(b != maxIndex) {
	multiBytes[b] \|= (byte)0x80;
	}
	}

	return multiBytes;
	}

	/** Constructs <code>WBMPImageWriter</code> based on the provided
	* <code>ImageWriterSpi</code>.
	*/
	public WBMPImageWriter(ImageWriterSpi originator) {
	super(originator);
	}

	public void setOutput(Object output) {
	super.setOutput(output); // validates output
	if (output != null) {
	if (!(output instanceof ImageOutputStream))
	throw new IllegalArgumentException(I18N.getString("WBMPImageWriter"));
	this.stream = (ImageOutputStream)output;
	} else
	this.stream = null;
	}

	public IIOMetadata getDefaultStreamMetadata(ImageWriteParam param) {
	return null;
	}

	public IIOMetadata getDefaultImageMetadata(ImageTypeSpecifier imageType,
	ImageWriteParam param) {
	WBMPMetadata meta = new WBMPMetadata();
	meta.wbmpType = 0; // default wbmp level
	return meta;
	}

	public IIOMetadata convertStreamMetadata(IIOMetadata inData,
	ImageWriteParam param) {
	return null;
	}

	public IIOMetadata convertImageMetadata(IIOMetadata metadata,
	ImageTypeSpecifier type,
	ImageWriteParam param) {
	return null;
	}

	public boolean canWriteRasters() {
	return true;
	}

	public void write(IIOMetadata streamMetadata,
	IIOImage image,
	ImageWriteParam param) throws IOException {

	if (stream == null) {
	throw new IllegalStateException(I18N.getString("WBMPImageWriter3"));
	}

	if (image == null) {
	throw new IllegalArgumentException(I18N.getString("WBMPImageWriter4"));
	}

	clearAbortRequest();
	processImageStarted(0);
	if (param == null)
	param = getDefaultWriteParam();

	RenderedImage input = null;
	Raster inputRaster = null;
	boolean writeRaster = image.hasRaster();
	Rectangle sourceRegion = param.getSourceRegion();
	SampleModel sampleModel = null;

	if (writeRaster) {
	inputRaster = image.getRaster();
	sampleModel = inputRaster.getSampleModel();
	} else {
	input = image.getRenderedImage();
	sampleModel = input.getSampleModel();

	inputRaster = input.getData();
	}

	checkSampleModel(sampleModel);
	if (sourceRegion == null)
	sourceRegion = inputRaster.getBounds();
	else
	sourceRegion = sourceRegion.intersection(inputRaster.getBounds());

	if (sourceRegion.isEmpty())
	throw new RuntimeException(I18N.getString("WBMPImageWriter1"));

	int scaleX = param.getSourceXSubsampling();
	int scaleY = param.getSourceYSubsampling();
	int xOffset = param.getSubsamplingXOffset();
	int yOffset = param.getSubsamplingYOffset();

	sourceRegion.translate(xOffset, yOffset);
	sourceRegion.width -= xOffset;
	sourceRegion.height -= yOffset;

	int minX = sourceRegion.x / scaleX;
	int minY = sourceRegion.y / scaleY;
	int w = (sourceRegion.width + scaleX - 1) / scaleX;
	int h = (sourceRegion.height + scaleY - 1) / scaleY;

	Rectangle destinationRegion = new Rectangle(minX, minY, w, h);
	sampleModel = sampleModel.createCompatibleSampleModel(w, h);

	SampleModel destSM= sampleModel;

	// If the data are not formatted nominally then reformat.
	if(sampleModel.getDataType() != DataBuffer.TYPE_BYTE \|\|
	!(sampleModel instanceof MultiPixelPackedSampleModel) \|\|
	((MultiPixelPackedSampleModel)sampleModel).getDataBitOffset() != 0) {
	destSM =
	new MultiPixelPackedSampleModel(DataBuffer.TYPE_BYTE,
	w, h, 1,
	w + 7 >> 3, 0);
	}

	if (!destinationRegion.equals(sourceRegion)) {
	if (scaleX == 1 && scaleY == 1)
	inputRaster = inputRaster.createChild(inputRaster.getMinX(),
	inputRaster.getMinY(),
	w, h, minX, minY, null);
	else {
	WritableRaster ras = Raster.createWritableRaster(destSM,
	new Point(minX, minY));

	byte[] data = ((DataBufferByte)ras.getDataBuffer()).getData();

	for(int j = minY, y = sourceRegion.y, k = 0;
	j < minY + h; j++, y += scaleY) {

	for (int i = 0, x = sourceRegion.x;
	i <w; i++, x +=scaleX) {
	int v = inputRaster.getSample(x, y, 0);
	data[k + (i >> 3)] \|= v << (7 - (i & 7));
	}
	k += w + 7 >> 3;
	}
	inputRaster = ras;
	}
	}

	// If the data are not formatted nominally then reformat.
	if(!destSM.equals(inputRaster.getSampleModel())) {
	WritableRaster raster =
	Raster.createWritableRaster(destSM,
	new Point(inputRaster.getMinX(),
	inputRaster.getMinY()));
	raster.setRect(inputRaster);
	inputRaster = raster;
	}

	// Check whether the image is white-is-zero.
	boolean isWhiteZero = false;
	if(!writeRaster && input.getColorModel() instanceof IndexColorModel) {
	IndexColorModel icm = (IndexColorModel)input.getColorModel();
	isWhiteZero = icm.getRed(0) > icm.getRed(1);
	}

	// Get the line stride, bytes per row, and data array.
	int lineStride =
	((MultiPixelPackedSampleModel)destSM).getScanlineStride();
	int bytesPerRow = (w + 7)/8;
	byte[] bdata = ((DataBufferByte)inputRaster.getDataBuffer()).getData();

	// Write WBMP header.
	stream.write(0); // TypeField
	stream.write(0); // FixHeaderField
	stream.write(intToMultiByte(w)); // width
	stream.write(intToMultiByte(h)); // height

	// Write the data.
	if(!isWhiteZero && lineStride == bytesPerRow) {
	// Write the entire image.
	stream.write(bdata, 0, h * bytesPerRow);
	processImageProgress(100.0F);
	} else {
	// Write the image row-by-row.
	int offset = 0;
	if(!isWhiteZero) {
	// Black-is-zero
	for(int row = 0; row < h; row++) {
	if (abortRequested())
	break;
	stream.write(bdata, offset, bytesPerRow);
	offset += lineStride;
	processImageProgress(100.0F * row / h);
	}
	} else {
	// White-is-zero: need to invert data.
	byte[] inverted = new byte[bytesPerRow];
	for(int row = 0; row < h; row++) {
	if (abortRequested())
	break;
	for(int col = 0; col < bytesPerRow; col++) {
	inverted[col] = (byte)(~(bdata[col+offset]));
	}
	stream.write(inverted, 0, bytesPerRow);
	offset += lineStride;
	processImageProgress(100.0F * row / h);
	}
	}
	}

	if (abortRequested())
	processWriteAborted();
	else {
	processImageComplete();
	stream.flushBefore(stream.getStreamPosition());
	}
	}

	public void reset() {
	super.reset();
	stream = null;
	}

	private void checkSampleModel(SampleModel sm) {
	int type = sm.getDataType();
	if (type < DataBuffer.TYPE_BYTE \|\| type > DataBuffer.TYPE_INT
	\|\| sm.getNumBands() != 1 \|\| sm.getSampleSize(0) != 1)
	throw new IllegalArgumentException(I18N.getString("WBMPImageWriter2"));
	}
	}

Back to index...