/*
* @(#)WBMPImageReader.java 1.10 03/12/19 16:54:40
*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package com.sun.imageio.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 javax.imageio.IIOException;
import javax.imageio.ImageReader;
import javax.imageio.ImageReadParam;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.spi.ImageReaderSpi;
import javax.imageio.stream.ImageInputStream;
import java.io.*;
import java.util.ArrayList;
import java.util.Iterator;
import com.sun.imageio.plugins.common.I18N;
/** 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 <code>WBMPImageReadParam</code>.
*/
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 original image width. */
private int width;
/** The original image height. */
private int height;
private int wbmpType;
private WBMPMetadata metadata;
/** Constructs <code>WBMPImageReader</code> from the provided
* <code>ImageReaderSpi</code>.
*/
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)
return;
if (iis == null) {
throw new IllegalStateException("Input source not set!");
}
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 = readMultiByteInteger();
metadata.width = width;
// Read image height
height = readMultiByteInteger();
metadata.height = height;
gotHeader = true;
}
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;
}
private int readMultiByteInteger() throws IOException {
int value = iis.readByte();
int result = value & 0x7f;
while((value & 0x80) == 0x80) {
result <<= 7;
value = iis.readByte();
result |= (value & 0x7f);
}
return result;
}
/*
* 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;
}
}
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