JDK8/Java8源码在线阅读
/*
* Copyright (c) 2001, 2013, 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.jpeg;
import javax.imageio.IIOException;
import javax.imageio.IIOImage;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.ImageReader;
import javax.imageio.metadata.IIOInvalidTreeException;
import javax.imageio.metadata.IIOMetadataNode;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.stream.ImageOutputStream;
import javax.imageio.stream.MemoryCacheImageOutputStream;
import javax.imageio.event.IIOReadProgressListener;
import java.awt.Graphics;
import java.awt.color.ICC_Profile;
import java.awt.color.ICC_ColorSpace;
import java.awt.color.ColorSpace;
import java.awt.image.ColorModel;
import java.awt.image.SampleModel;
import java.awt.image.IndexColorModel;
import java.awt.image.ComponentColorModel;
import java.awt.image.BufferedImage;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferByte;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
import java.io.IOException;
import java.io.ByteArrayOutputStream;
import java.util.List;
import java.util.ArrayList;
import java.util.Iterator;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.NamedNodeMap;
/**
* A JFIF (JPEG File Interchange Format) APP0 (Application-Specific)
* marker segment. Inner classes are included for JFXX extension
* marker segments, for different varieties of thumbnails, and for
* ICC Profile APP2 marker segments. Any of these secondary types
* that occur are kept as members of a single JFIFMarkerSegment object.
*/
class JFIFMarkerSegment extends MarkerSegment {
int majorVersion;
int minorVersion;
int resUnits;
int Xdensity;
int Ydensity;
int thumbWidth;
int thumbHeight;
JFIFThumbRGB thumb = null; // If present
ArrayList extSegments = new ArrayList();
ICCMarkerSegment iccSegment = null; // optional ICC
private static final int THUMB_JPEG = 0x10;
private static final int THUMB_PALETTE = 0x11;
private static final int THUMB_UNASSIGNED = 0x12;
private static final int THUMB_RGB = 0x13;
private static final int DATA_SIZE = 14;
private static final int ID_SIZE = 5;
private final int MAX_THUMB_WIDTH = 255;
private final int MAX_THUMB_HEIGHT = 255;
private final boolean debug = false;
/**
* Set to <code>true</code> when reading the chunks of an
* ICC profile. All chunks are consolidated to create a single
* "segment" containing all the chunks. This flag is a state
* variable identifying whether to construct a new segment or
* append to an old one.
*/
private boolean inICC = false;
/**
* A placeholder for an ICC profile marker segment under
* construction. The segment is not added to the list
* until all chunks have been read.
*/
private ICCMarkerSegment tempICCSegment = null;
/**
* Default constructor. Used to create a default JFIF header
*/
JFIFMarkerSegment() {
super(JPEG.APP0);
majorVersion = 1;
minorVersion = 2;
resUnits = JPEG.DENSITY_UNIT_ASPECT_RATIO;
Xdensity = 1;
Ydensity = 1;
thumbWidth = 0;
thumbHeight = 0;
}
/**
* Constructs a JFIF header by reading from a stream wrapped
* in a JPEGBuffer.
*/
JFIFMarkerSegment(JPEGBuffer buffer) throws IOException {
super(buffer);
buffer.bufPtr += ID_SIZE; // skip the id, we already checked it
majorVersion = buffer.buf[buffer.bufPtr++];
minorVersion = buffer.buf[buffer.bufPtr++];
resUnits = buffer.buf[buffer.bufPtr++];
Xdensity = (buffer.buf[buffer.bufPtr++] & 0xff) << 8;
Xdensity |= buffer.buf[buffer.bufPtr++] & 0xff;
Ydensity = (buffer.buf[buffer.bufPtr++] & 0xff) << 8;
Ydensity |= buffer.buf[buffer.bufPtr++] & 0xff;
thumbWidth = buffer.buf[buffer.bufPtr++] & 0xff;
thumbHeight = buffer.buf[buffer.bufPtr++] & 0xff;
buffer.bufAvail -= DATA_SIZE;
if (thumbWidth > 0) {
thumb = new JFIFThumbRGB(buffer, thumbWidth, thumbHeight);
}
}
/**
* Constructs a JFIF header from a DOM Node.
*/
JFIFMarkerSegment(Node node) throws IIOInvalidTreeException {
this();
updateFromNativeNode(node, true);
}
/**
* Returns a deep-copy clone of this object.
*/
protected Object clone() {
JFIFMarkerSegment newGuy = (JFIFMarkerSegment) super.clone();
if (!extSegments.isEmpty()) { // Clone the list with a deep copy
newGuy.extSegments = new ArrayList();
for (Iterator iter = extSegments.iterator(); iter.hasNext();) {
JFIFExtensionMarkerSegment jfxx =
(JFIFExtensionMarkerSegment) iter.next();
newGuy.extSegments.add(jfxx.clone());
}
}
if (iccSegment != null) {
newGuy.iccSegment = (ICCMarkerSegment) iccSegment.clone();
}
return newGuy;
}
/**
* Add an JFXX extension marker segment from the stream wrapped
* in the JPEGBuffer to the list of extension segments.
*/
void addJFXX(JPEGBuffer buffer, JPEGImageReader reader)
throws IOException {
extSegments.add(new JFIFExtensionMarkerSegment(buffer, reader));
}
/**
* Adds an ICC Profile APP2 segment from the stream wrapped
* in the JPEGBuffer.
*/
void addICC(JPEGBuffer buffer) throws IOException {
if (inICC == false) {
if (iccSegment != null) {
throw new IIOException
("> 1 ICC APP2 Marker Segment not supported");
}
tempICCSegment = new ICCMarkerSegment(buffer);
if (inICC == false) { // Just one chunk
iccSegment = tempICCSegment;
tempICCSegment = null;
}
} else {
if (tempICCSegment.addData(buffer) == true) {
iccSegment = tempICCSegment;
tempICCSegment = null;
}
}
}
/**
* Add an ICC Profile APP2 segment by constructing it from
* the given ICC_ColorSpace object.
*/
void addICC(ICC_ColorSpace cs) throws IOException {
if (iccSegment != null) {
throw new IIOException
("> 1 ICC APP2 Marker Segment not supported");
}
iccSegment = new ICCMarkerSegment(cs);
}
/**
* Returns a tree of DOM nodes representing this object and any
* subordinate JFXX extension or ICC Profile segments.
*/
IIOMetadataNode getNativeNode() {
IIOMetadataNode node = new IIOMetadataNode("app0JFIF");
node.setAttribute("majorVersion", Integer.toString(majorVersion));
node.setAttribute("minorVersion", Integer.toString(minorVersion));
node.setAttribute("resUnits", Integer.toString(resUnits));
node.setAttribute("Xdensity", Integer.toString(Xdensity));
node.setAttribute("Ydensity", Integer.toString(Ydensity));
node.setAttribute("thumbWidth", Integer.toString(thumbWidth));
node.setAttribute("thumbHeight", Integer.toString(thumbHeight));
if (!extSegments.isEmpty()) {
IIOMetadataNode JFXXnode = new IIOMetadataNode("JFXX");
node.appendChild(JFXXnode);
for (Iterator iter = extSegments.iterator(); iter.hasNext();) {
JFIFExtensionMarkerSegment seg =
(JFIFExtensionMarkerSegment) iter.next();
JFXXnode.appendChild(seg.getNativeNode());
}
}
if (iccSegment != null) {
node.appendChild(iccSegment.getNativeNode());
}
return node;
}
/**
* Updates the data in this object from the given DOM Node tree.
* If fromScratch is true, this object is being constructed.
* Otherwise an existing object is being modified.
* Throws an IIOInvalidTreeException if the tree is invalid in
* any way.
*/
void updateFromNativeNode(Node node, boolean fromScratch)
throws IIOInvalidTreeException {
// none of the attributes are required
NamedNodeMap attrs = node.getAttributes();
if (attrs.getLength() > 0) {
int value = getAttributeValue(node, attrs, "majorVersion",
0, 255, false);
majorVersion = (value != -1) ? value : majorVersion;
value = getAttributeValue(node, attrs, "minorVersion",
0, 255, false);
minorVersion = (value != -1) ? value : minorVersion;
value = getAttributeValue(node, attrs, "resUnits", 0, 2, false);
resUnits = (value != -1) ? value : resUnits;
value = getAttributeValue(node, attrs, "Xdensity", 1, 65535, false);
Xdensity = (value != -1) ? value : Xdensity;
value = getAttributeValue(node, attrs, "Ydensity", 1, 65535, false);
Ydensity = (value != -1) ? value : Ydensity;
value = getAttributeValue(node, attrs, "thumbWidth", 0, 255, false);
thumbWidth = (value != -1) ? value : thumbWidth;
value = getAttributeValue(node, attrs, "thumbHeight", 0, 255, false);
thumbHeight = (value != -1) ? value : thumbHeight;
}
if (node.hasChildNodes()) {
NodeList children = node.getChildNodes();
int count = children.getLength();
if (count > 2) {
throw new IIOInvalidTreeException
("app0JFIF node cannot have > 2 children", node);
}
for (int i = 0; i < count; i++) {
Node child = children.item(i);
String name = child.getNodeName();
if (name.equals("JFXX")) {
if ((!extSegments.isEmpty()) && fromScratch) {
throw new IIOInvalidTreeException
("app0JFIF node cannot have > 1 JFXX node", node);
}
NodeList exts = child.getChildNodes();
int extCount = exts.getLength();
for (int j = 0; j < extCount; j++) {
Node ext = exts.item(j);
extSegments.add(new JFIFExtensionMarkerSegment(ext));
}
}
if (name.equals("app2ICC")) {
if ((iccSegment != null) && fromScratch) {
throw new IIOInvalidTreeException
("> 1 ICC APP2 Marker Segment not supported", node);
}
iccSegment = new ICCMarkerSegment(child);
}
}
}
}
int getThumbnailWidth(int index) {
if (thumb != null) {
if (index == 0) {
return thumb.getWidth();
}
index--;
}
JFIFExtensionMarkerSegment jfxx =
(JFIFExtensionMarkerSegment) extSegments.get(index);
return jfxx.thumb.getWidth();
}
int getThumbnailHeight(int index) {
if (thumb != null) {
if (index == 0) {
return thumb.getHeight();
}
index--;
}
JFIFExtensionMarkerSegment jfxx =
(JFIFExtensionMarkerSegment) extSegments.get(index);
return jfxx.thumb.getHeight();
}
BufferedImage getThumbnail(ImageInputStream iis,
int index,
JPEGImageReader reader) throws IOException {
reader.thumbnailStarted(index);
BufferedImage ret = null;
if ((thumb != null) && (index == 0)) {
ret = thumb.getThumbnail(iis, reader);
} else {
if (thumb != null) {
index--;
}
JFIFExtensionMarkerSegment jfxx =
(JFIFExtensionMarkerSegment) extSegments.get(index);
ret = jfxx.thumb.getThumbnail(iis, reader);
}
reader.thumbnailComplete();
return ret;
}
/**
* Writes the data for this segment to the stream in
* valid JPEG format. Assumes that there will be no thumbnail.
*/
void write(ImageOutputStream ios,
JPEGImageWriter writer) throws IOException {
// No thumbnail
write(ios, null, writer);
}
/**
* Writes the data for this segment to the stream in
* valid JPEG format. The length written takes the thumbnail
* width and height into account. If necessary, the thumbnail
* is clipped to 255 x 255 and a warning is sent to the writer
* argument. Progress updates are sent to the writer argument.
*/
void write(ImageOutputStream ios,
BufferedImage thumb,
JPEGImageWriter writer) throws IOException {
int thumbWidth = 0;
int thumbHeight = 0;
int thumbLength = 0;
int [] thumbData = null;
if (thumb != null) {
// Clip if necessary and get the data in thumbData
thumbWidth = thumb.getWidth();
thumbHeight = thumb.getHeight();
if ((thumbWidth > MAX_THUMB_WIDTH)
|| (thumbHeight > MAX_THUMB_HEIGHT)) {
writer.warningOccurred(JPEGImageWriter.WARNING_THUMB_CLIPPED);
}
thumbWidth = Math.min(thumbWidth, MAX_THUMB_WIDTH);
thumbHeight = Math.min(thumbHeight, MAX_THUMB_HEIGHT);
thumbData = thumb.getRaster().getPixels(0, 0,
thumbWidth, thumbHeight,
(int []) null);
thumbLength = thumbData.length;
}
length = DATA_SIZE + LENGTH_SIZE + thumbLength;
writeTag(ios);
byte [] id = {0x4A, 0x46, 0x49, 0x46, 0x00};
ios.write(id);
ios.write(majorVersion);
ios.write(minorVersion);
ios.write(resUnits);
write2bytes(ios, Xdensity);
write2bytes(ios, Ydensity);
ios.write(thumbWidth);
ios.write(thumbHeight);
if (thumbData != null) {
writer.thumbnailStarted(0);
writeThumbnailData(ios, thumbData, writer);
writer.thumbnailComplete();
}
}
/*
* Write out the values in the integer array as a sequence of bytes,
* reporting progress to the writer argument.
*/
void writeThumbnailData(ImageOutputStream ios,
int [] thumbData,
JPEGImageWriter writer) throws IOException {
int progInterval = thumbData.length / 20; // approx. every 5%
if (progInterval == 0) {
progInterval = 1;
}
for (int i = 0; i < thumbData.length; i++) {
ios.write(thumbData[i]);
if ((i > progInterval) && (i % progInterval == 0)) {
writer.thumbnailProgress
(((float) i * 100) / ((float) thumbData.length));
}
}
}
/**
* Write out this JFIF Marker Segment, including a thumbnail or
* appending a series of JFXX Marker Segments, as appropriate.
* Warnings and progress reports are sent to the writer argument.
* The list of thumbnails is matched to the list of JFXX extension
* segments, if any, in order to determine how to encode the
* thumbnails. If there are more thumbnails than metadata segments,
* default encoding is used for the extra thumbnails.
*/
void writeWithThumbs(ImageOutputStream ios,
List thumbnails,
JPEGImageWriter writer) throws IOException {
if (thumbnails != null) {
JFIFExtensionMarkerSegment jfxx = null;
if (thumbnails.size() == 1) {
if (!extSegments.isEmpty()) {
jfxx = (JFIFExtensionMarkerSegment) extSegments.get(0);
}
writeThumb(ios,
(BufferedImage) thumbnails.get(0),
jfxx,
0,
true,
writer);
} else {
// All others write as separate JFXX segments
write(ios, writer); // Just the header without any thumbnail
for (int i = 0; i < thumbnails.size(); i++) {
jfxx = null;
if (i < extSegments.size()) {
jfxx = (JFIFExtensionMarkerSegment) extSegments.get(i);
}
writeThumb(ios,
(BufferedImage) thumbnails.get(i),
jfxx,
i,
false,
writer);
}
}
} else { // No thumbnails
write(ios, writer);
}
}
private void writeThumb(ImageOutputStream ios,
BufferedImage thumb,
JFIFExtensionMarkerSegment jfxx,
int index,
boolean onlyOne,
JPEGImageWriter writer) throws IOException {
ColorModel cm = thumb.getColorModel();
ColorSpace cs = cm.getColorSpace();
if (cm instanceof IndexColorModel) {
// We never write a palette image into the header
// So if it's the only one, we need to write the header first
if (onlyOne) {
write(ios, writer);
}
if ((jfxx == null)
|| (jfxx.code == THUMB_PALETTE)) {
writeJFXXSegment(index, thumb, ios, writer); // default
} else {
// Expand to RGB
BufferedImage thumbRGB =
((IndexColorModel) cm).convertToIntDiscrete
(thumb.getRaster(), false);
jfxx.setThumbnail(thumbRGB);
writer.thumbnailStarted(index);
jfxx.write(ios, writer); // Handles clipping if needed
writer.thumbnailComplete();
}
} else if (cs.getType() == ColorSpace.TYPE_RGB) {
if (jfxx == null) {
if (onlyOne) {
write(ios, thumb, writer); // As part of the header
} else {
writeJFXXSegment(index, thumb, ios, writer); // default
}
} else {
// If this is the only one, write the header first
if (onlyOne) {
write(ios, writer);
}
if (jfxx.code == THUMB_PALETTE) {
writeJFXXSegment(index, thumb, ios, writer); // default
writer.warningOccurred
(JPEGImageWriter.WARNING_NO_RGB_THUMB_AS_INDEXED);
} else {
jfxx.setThumbnail(thumb);
writer.thumbnailStarted(index);
jfxx.write(ios, writer); // Handles clipping if needed
writer.thumbnailComplete();
}
}
} else if (cs.getType() == ColorSpace.TYPE_GRAY) {
if (jfxx == null) {
if (onlyOne) {
BufferedImage thumbRGB = expandGrayThumb(thumb);
write(ios, thumbRGB, writer); // As part of the header
} else {
writeJFXXSegment(index, thumb, ios, writer); // default
}
} else {
// If this is the only one, write the header first
if (onlyOne) {
write(ios, writer);
}
if (jfxx.code == THUMB_RGB) {
BufferedImage thumbRGB = expandGrayThumb(thumb);
writeJFXXSegment(index, thumbRGB, ios, writer);
} else if (jfxx.code == THUMB_JPEG) {
jfxx.setThumbnail(thumb);
writer.thumbnailStarted(index);
jfxx.write(ios, writer); // Handles clipping if needed
writer.thumbnailComplete();
} else if (jfxx.code == THUMB_PALETTE) {
writeJFXXSegment(index, thumb, ios, writer); // default
writer.warningOccurred
(JPEGImageWriter.WARNING_NO_GRAY_THUMB_AS_INDEXED);
}
}
} else {
writer.warningOccurred
(JPEGImageWriter.WARNING_ILLEGAL_THUMBNAIL);
}
}
// Could put reason codes in here to be parsed in writeJFXXSegment
// in order to provide more meaningful warnings.
private class IllegalThumbException extends Exception {}
/**
* Writes out a new JFXX extension segment, without saving it.
*/
private void writeJFXXSegment(int index,
BufferedImage thumbnail,
ImageOutputStream ios,
JPEGImageWriter writer) throws IOException {
JFIFExtensionMarkerSegment jfxx = null;
try {
jfxx = new JFIFExtensionMarkerSegment(thumbnail);
} catch (IllegalThumbException e) {
writer.warningOccurred
(JPEGImageWriter.WARNING_ILLEGAL_THUMBNAIL);
return;
}
writer.thumbnailStarted(index);
jfxx.write(ios, writer);
writer.thumbnailComplete();
}
/**
* Return an RGB image that is the expansion of the given grayscale
* image.
*/
private static BufferedImage expandGrayThumb(BufferedImage thumb) {
BufferedImage ret = new BufferedImage(thumb.getWidth(),
thumb.getHeight(),
BufferedImage.TYPE_INT_RGB);
Graphics g = ret.getGraphics();
g.drawImage(thumb, 0, 0, null);
return ret;
}
/**
* Writes out a default JFIF marker segment to the given
* output stream. If <code>thumbnails</code> is not <code>null</code>,
* writes out the set of thumbnail images as JFXX marker segments, or
* incorporated into the JFIF segment if appropriate.
* If <code>iccProfile</code> is not <code>null</code>,
* writes out the profile after the JFIF segment using as many APP2
* marker segments as necessary.
*/
static void writeDefaultJFIF(ImageOutputStream ios,
List thumbnails,
ICC_Profile iccProfile,
JPEGImageWriter writer)
throws IOException {
JFIFMarkerSegment jfif = new JFIFMarkerSegment();
jfif.writeWithThumbs(ios, thumbnails, writer);
if (iccProfile != null) {
writeICC(iccProfile, ios);
}
}
/**
* Prints out the contents of this object to System.out for debugging.
*/
void print() {
printTag("JFIF");
System.out.print("Version ");
System.out.print(majorVersion);
System.out.println(".0"
+ Integer.toString(minorVersion));
System.out.print("Resolution units: ");
System.out.println(resUnits);
System.out.print("X density: ");
System.out.println(Xdensity);
System.out.print("Y density: ");
System.out.println(Ydensity);
System.out.print("Thumbnail Width: ");
System.out.println(thumbWidth);
System.out.print("Thumbnail Height: ");
System.out.println(thumbHeight);
if (!extSegments.isEmpty()) {
for (Iterator iter = extSegments.iterator(); iter.hasNext();) {
JFIFExtensionMarkerSegment extSegment =
(JFIFExtensionMarkerSegment) iter.next();
extSegment.print();
}
}
if (iccSegment != null) {
iccSegment.print();
}
}
/**
* A JFIF extension APP0 marker segment.
*/
class JFIFExtensionMarkerSegment extends MarkerSegment {
int code;
JFIFThumb thumb;
private static final int DATA_SIZE = 6;
private static final int ID_SIZE = 5;
JFIFExtensionMarkerSegment(JPEGBuffer buffer, JPEGImageReader reader)
throws IOException {
super(buffer);
buffer.bufPtr += ID_SIZE; // skip the id, we already checked it
code = buffer.buf[buffer.bufPtr++] & 0xff;
buffer.bufAvail -= DATA_SIZE;
if (code == THUMB_JPEG) {
thumb = new JFIFThumbJPEG(buffer, length, reader);
} else {
buffer.loadBuf(2);
int thumbX = buffer.buf[buffer.bufPtr++] & 0xff;
int thumbY = buffer.buf[buffer.bufPtr++] & 0xff;
buffer.bufAvail -= 2;
// following constructors handle bufAvail
if (code == THUMB_PALETTE) {
thumb = new JFIFThumbPalette(buffer, thumbX, thumbY);
} else {
thumb = new JFIFThumbRGB(buffer, thumbX, thumbY);
}
}
}
JFIFExtensionMarkerSegment(Node node) throws IIOInvalidTreeException {
super(JPEG.APP0);
NamedNodeMap attrs = node.getAttributes();
if (attrs.getLength() > 0) {
code = getAttributeValue(node,
attrs,
"extensionCode",
THUMB_JPEG,
THUMB_RGB,
false);
if (code == THUMB_UNASSIGNED) {
throw new IIOInvalidTreeException
("invalid extensionCode attribute value", node);
}
} else {
code = THUMB_UNASSIGNED;
}
// Now the child
if (node.getChildNodes().getLength() != 1) {
throw new IIOInvalidTreeException
("app0JFXX node must have exactly 1 child", node);
}
Node child = node.getFirstChild();
String name = child.getNodeName();
if (name.equals("JFIFthumbJPEG")) {
if (code == THUMB_UNASSIGNED) {
code = THUMB_JPEG;
}
thumb = new JFIFThumbJPEG(child);
} else if (name.equals("JFIFthumbPalette")) {
if (code == THUMB_UNASSIGNED) {
code = THUMB_PALETTE;
}
thumb = new JFIFThumbPalette(child);
} else if (name.equals("JFIFthumbRGB")) {
if (code == THUMB_UNASSIGNED) {
code = THUMB_RGB;
}
thumb = new JFIFThumbRGB(child);
} else {
throw new IIOInvalidTreeException
("unrecognized app0JFXX child node", node);
}
}
JFIFExtensionMarkerSegment(BufferedImage thumbnail)
throws IllegalThumbException {
super(JPEG.APP0);
ColorModel cm = thumbnail.getColorModel();
int csType = cm.getColorSpace().getType();
if (cm.hasAlpha()) {
throw new IllegalThumbException();
}
if (cm instanceof IndexColorModel) {
code = THUMB_PALETTE;
thumb = new JFIFThumbPalette(thumbnail);
} else if (csType == ColorSpace.TYPE_RGB) {
code = THUMB_RGB;
thumb = new JFIFThumbRGB(thumbnail);
} else if (csType == ColorSpace.TYPE_GRAY) {
code = THUMB_JPEG;
thumb = new JFIFThumbJPEG(thumbnail);
} else {
throw new IllegalThumbException();
}
}
void setThumbnail(BufferedImage thumbnail) {
try {
switch (code) {
case THUMB_PALETTE:
thumb = new JFIFThumbPalette(thumbnail);
break;
case THUMB_RGB:
thumb = new JFIFThumbRGB(thumbnail);
break;
case THUMB_JPEG:
thumb = new JFIFThumbJPEG(thumbnail);
break;
}
} catch (IllegalThumbException e) {
// Should never happen
throw new InternalError("Illegal thumb in setThumbnail!", e);
}
}
protected Object clone() {
JFIFExtensionMarkerSegment newGuy =
(JFIFExtensionMarkerSegment) super.clone();
if (thumb != null) {
newGuy.thumb = (JFIFThumb) thumb.clone();
}
return newGuy;
}
IIOMetadataNode getNativeNode() {
IIOMetadataNode node = new IIOMetadataNode("app0JFXX");
node.setAttribute("extensionCode", Integer.toString(code));
node.appendChild(thumb.getNativeNode());
return node;
}
void write(ImageOutputStream ios,
JPEGImageWriter writer) throws IOException {
length = LENGTH_SIZE + DATA_SIZE + thumb.getLength();
writeTag(ios);
byte [] id = {0x4A, 0x46, 0x58, 0x58, 0x00};
ios.write(id);
ios.write(code);
thumb.write(ios, writer);
}
void print() {
printTag("JFXX");
thumb.print();
}
}
/**
* A superclass for the varieties of thumbnails that can
* be stored in a JFIF extension marker segment.
*/
abstract class JFIFThumb implements Cloneable {
long streamPos = -1L; // Save the thumbnail pos when reading
abstract int getLength(); // When writing
abstract int getWidth();
abstract int getHeight();
abstract BufferedImage getThumbnail(ImageInputStream iis,
JPEGImageReader reader)
throws IOException;
protected JFIFThumb() {}
protected JFIFThumb(JPEGBuffer buffer) throws IOException{
// Save the stream position for reading the thumbnail later
streamPos = buffer.getStreamPosition();
}
abstract void print();
abstract IIOMetadataNode getNativeNode();
abstract void write(ImageOutputStream ios,
JPEGImageWriter writer) throws IOException;
protected Object clone() {
try {
return super.clone();
} catch (CloneNotSupportedException e) {} // won't happen
return null;
}
}
abstract class JFIFThumbUncompressed extends JFIFThumb {
BufferedImage thumbnail = null;
int thumbWidth;
int thumbHeight;
String name;
JFIFThumbUncompressed(JPEGBuffer buffer,
int width,
int height,
int skip,
String name)
throws IOException {
super(buffer);
thumbWidth = width;
thumbHeight = height;
// Now skip the thumbnail data
buffer.skipData(skip);
this.name = name;
}
JFIFThumbUncompressed(Node node, String name)
throws IIOInvalidTreeException {
thumbWidth = 0;
thumbHeight = 0;
this.name = name;
NamedNodeMap attrs = node.getAttributes();
int count = attrs.getLength();
if (count > 2) {
throw new IIOInvalidTreeException
(name +" node cannot have > 2 attributes", node);
}
if (count != 0) {
int value = getAttributeValue(node, attrs, "thumbWidth",
0, 255, false);
thumbWidth = (value != -1) ? value : thumbWidth;
value = getAttributeValue(node, attrs, "thumbHeight",
0, 255, false);
thumbHeight = (value != -1) ? value : thumbHeight;
}
}
JFIFThumbUncompressed(BufferedImage thumb) {
thumbnail = thumb;
thumbWidth = thumb.getWidth();
thumbHeight = thumb.getHeight();
name = null; // not used when writing
}
void readByteBuffer(ImageInputStream iis,
byte [] data,
JPEGImageReader reader,
float workPortion,
float workOffset) throws IOException {
int progInterval = Math.max((int)(data.length/20/workPortion),
1);
for (int offset = 0;
offset < data.length;) {
int len = Math.min(progInterval, data.length-offset);
iis.read(data, offset, len);
offset += progInterval;
float percentDone = ((float) offset* 100)
/ data.length
* workPortion + workOffset;
if (percentDone > 100.0F) {
percentDone = 100.0F;
}
reader.thumbnailProgress (percentDone);
}
}
int getWidth() {
return thumbWidth;
}
int getHeight() {
return thumbHeight;
}
IIOMetadataNode getNativeNode() {
IIOMetadataNode node = new IIOMetadataNode(name);
node.setAttribute("thumbWidth", Integer.toString(thumbWidth));
node.setAttribute("thumbHeight", Integer.toString(thumbHeight));
return node;
}
void write(ImageOutputStream ios,
JPEGImageWriter writer) throws IOException {
if ((thumbWidth > MAX_THUMB_WIDTH)
|| (thumbHeight > MAX_THUMB_HEIGHT)) {
writer.warningOccurred(JPEGImageWriter.WARNING_THUMB_CLIPPED);
}
thumbWidth = Math.min(thumbWidth, MAX_THUMB_WIDTH);
thumbHeight = Math.min(thumbHeight, MAX_THUMB_HEIGHT);
ios.write(thumbWidth);
ios.write(thumbHeight);
}
void writePixels(ImageOutputStream ios,
JPEGImageWriter writer) throws IOException {
if ((thumbWidth > MAX_THUMB_WIDTH)
|| (thumbHeight > MAX_THUMB_HEIGHT)) {
writer.warningOccurred(JPEGImageWriter.WARNING_THUMB_CLIPPED);
}
thumbWidth = Math.min(thumbWidth, MAX_THUMB_WIDTH);
thumbHeight = Math.min(thumbHeight, MAX_THUMB_HEIGHT);
int [] data = thumbnail.getRaster().getPixels(0, 0,
thumbWidth,
thumbHeight,
(int []) null);
writeThumbnailData(ios, data, writer);
}
void print() {
System.out.print(name + " width: ");
System.out.println(thumbWidth);
System.out.print(name + " height: ");
System.out.println(thumbHeight);
}
}
/**
* A JFIF thumbnail stored as RGB, one byte per channel,
* interleaved.
*/
class JFIFThumbRGB extends JFIFThumbUncompressed {
JFIFThumbRGB(JPEGBuffer buffer, int width, int height)
throws IOException {
super(buffer, width, height, width*height*3, "JFIFthumbRGB");
}
JFIFThumbRGB(Node node) throws IIOInvalidTreeException {
super(node, "JFIFthumbRGB");
}
JFIFThumbRGB(BufferedImage thumb) throws IllegalThumbException {
super(thumb);
}
int getLength() {
return (thumbWidth*thumbHeight*3);
}
BufferedImage getThumbnail(ImageInputStream iis,
JPEGImageReader reader)
throws IOException {
iis.mark();
iis.seek(streamPos);
DataBufferByte buffer = new DataBufferByte(getLength());
readByteBuffer(iis,
buffer.getData(),
reader,
1.0F,
0.0F);
iis.reset();
WritableRaster raster =
Raster.createInterleavedRaster(buffer,
thumbWidth,
thumbHeight,
thumbWidth*3,
3,
new int [] {0, 1, 2},
null);
ColorModel cm = new ComponentColorModel(JPEG.JCS.sRGB,
false,
false,
ColorModel.OPAQUE,
DataBuffer.TYPE_BYTE);
return new BufferedImage(cm,
raster,
false,
null);
}
void write(ImageOutputStream ios,
JPEGImageWriter writer) throws IOException {
super.write(ios, writer); // width and height
writePixels(ios, writer);
}
}
/**
* A JFIF thumbnail stored as an indexed palette image
* using an RGB palette.
*/
class JFIFThumbPalette extends JFIFThumbUncompressed {
private static final int PALETTE_SIZE = 768;
JFIFThumbPalette(JPEGBuffer buffer, int width, int height)
throws IOException {
super(buffer,
width,
height,
PALETTE_SIZE + width * height,
"JFIFThumbPalette");
}
JFIFThumbPalette(Node node) throws IIOInvalidTreeException {
super(node, "JFIFThumbPalette");
}
JFIFThumbPalette(BufferedImage thumb) throws IllegalThumbException {
super(thumb);
IndexColorModel icm = (IndexColorModel) thumbnail.getColorModel();
if (icm.getMapSize() > 256) {
throw new IllegalThumbException();
}
}
int getLength() {
return (thumbWidth*thumbHeight + PALETTE_SIZE);
}
BufferedImage getThumbnail(ImageInputStream iis,
JPEGImageReader reader)
throws IOException {
iis.mark();
iis.seek(streamPos);
// read the palette
byte [] palette = new byte [PALETTE_SIZE];
float palettePart = ((float) PALETTE_SIZE) / getLength();
readByteBuffer(iis,
palette,
reader,
palettePart,
0.0F);
DataBufferByte buffer = new DataBufferByte(thumbWidth*thumbHeight);
readByteBuffer(iis,
buffer.getData(),
reader,
1.0F-palettePart,
palettePart);
iis.read();
iis.reset();
IndexColorModel cm = new IndexColorModel(8,
256,
palette,
0,
false);
SampleModel sm = cm.createCompatibleSampleModel(thumbWidth,
thumbHeight);
WritableRaster raster =
Raster.createWritableRaster(sm, buffer, null);
return new BufferedImage(cm,
raster,
false,
null);
}
void write(ImageOutputStream ios,
JPEGImageWriter writer) throws IOException {
super.write(ios, writer); // width and height
// Write the palette (must be 768 bytes)
byte [] palette = new byte[768];
IndexColorModel icm = (IndexColorModel) thumbnail.getColorModel();
byte [] reds = new byte [256];
byte [] greens = new byte [256];
byte [] blues = new byte [256];
icm.getReds(reds);
icm.getGreens(greens);
icm.getBlues(blues);
for (int i = 0; i < 256; i++) {
palette[i*3] = reds[i];
palette[i*3+1] = greens[i];
palette[i*3+2] = blues[i];
}
ios.write(palette);
writePixels(ios, writer);
}
}
/**
* A JFIF thumbnail stored as a JPEG stream. No JFIF or
* JFIF extension markers are permitted. There is no need
* to clip these, but the entire image must fit into a
* single JFXX marker segment.
*/
class JFIFThumbJPEG extends JFIFThumb {
JPEGMetadata thumbMetadata = null;
byte [] data = null; // Compressed image data, for writing
private static final int PREAMBLE_SIZE = 6;
JFIFThumbJPEG(JPEGBuffer buffer,
int length,
JPEGImageReader reader) throws IOException {
super(buffer);
// Compute the final stream position
long finalPos = streamPos + (length - PREAMBLE_SIZE);
// Set the stream back to the start of the thumbnail
// and read its metadata (but don't decode the image)
buffer.iis.seek(streamPos);
thumbMetadata = new JPEGMetadata(false, true, buffer.iis, reader);
// Set the stream to the computed final position
buffer.iis.seek(finalPos);
// Clear the now invalid buffer
buffer.bufAvail = 0;
buffer.bufPtr = 0;
}
JFIFThumbJPEG(Node node) throws IIOInvalidTreeException {
if (node.getChildNodes().getLength() > 1) {
throw new IIOInvalidTreeException
("JFIFThumbJPEG node must have 0 or 1 child", node);
}
Node child = node.getFirstChild();
if (child != null) {
String name = child.getNodeName();
if (!name.equals("markerSequence")) {
throw new IIOInvalidTreeException
("JFIFThumbJPEG child must be a markerSequence node",
node);
}
thumbMetadata = new JPEGMetadata(false, true);
thumbMetadata.setFromMarkerSequenceNode(child);
}
}
JFIFThumbJPEG(BufferedImage thumb) throws IllegalThumbException {
int INITIAL_BUFSIZE = 4096;
int MAZ_BUFSIZE = 65535 - 2 - PREAMBLE_SIZE;
try {
ByteArrayOutputStream baos =
new ByteArrayOutputStream(INITIAL_BUFSIZE);
MemoryCacheImageOutputStream mos =
new MemoryCacheImageOutputStream(baos);
JPEGImageWriter thumbWriter = new JPEGImageWriter(null);
thumbWriter.setOutput(mos);
// get default metadata for the thumb
JPEGMetadata metadata =
(JPEGMetadata) thumbWriter.getDefaultImageMetadata
(new ImageTypeSpecifier(thumb), null);
// Remove the jfif segment, which should be there.
MarkerSegment jfif = metadata.findMarkerSegment
(JFIFMarkerSegment.class, true);
if (jfif == null) {
throw new IllegalThumbException();
}
metadata.markerSequence.remove(jfif);
/* Use this if removing leaves a hole and causes trouble
// Get the tree
String format = metadata.getNativeMetadataFormatName();
IIOMetadataNode tree =
(IIOMetadataNode) metadata.getAsTree(format);
// If there is no app0jfif node, the image is bad
NodeList jfifs = tree.getElementsByTagName("app0JFIF");
if (jfifs.getLength() == 0) {
throw new IllegalThumbException();
}
// remove the app0jfif node
Node jfif = jfifs.item(0);
Node parent = jfif.getParentNode();
parent.removeChild(jfif);
metadata.setFromTree(format, tree);
*/
thumbWriter.write(new IIOImage(thumb, null, metadata));
thumbWriter.dispose();
// Now check that the size is OK
if (baos.size() > MAZ_BUFSIZE) {
throw new IllegalThumbException();
}
data = baos.toByteArray();
} catch (IOException e) {
throw new IllegalThumbException();
}
}
int getWidth() {
int retval = 0;
SOFMarkerSegment sof =
(SOFMarkerSegment) thumbMetadata.findMarkerSegment
(SOFMarkerSegment.class, true);
if (sof != null) {
retval = sof.samplesPerLine;
}
return retval;
}
int getHeight() {
int retval = 0;
SOFMarkerSegment sof =
(SOFMarkerSegment) thumbMetadata.findMarkerSegment
(SOFMarkerSegment.class, true);
if (sof != null) {
retval = sof.numLines;
}
return retval;
}
private class ThumbnailReadListener
implements IIOReadProgressListener {
JPEGImageReader reader = null;
ThumbnailReadListener (JPEGImageReader reader) {
this.reader = reader;
}
public void sequenceStarted(ImageReader source, int minIndex) {}
public void sequenceComplete(ImageReader source) {}
public void imageStarted(ImageReader source, int imageIndex) {}
public void imageProgress(ImageReader source,
float percentageDone) {
reader.thumbnailProgress(percentageDone);
}
public void imageComplete(ImageReader source) {}
public void thumbnailStarted(ImageReader source,
int imageIndex, int thumbnailIndex) {}
public void thumbnailProgress(ImageReader source, float percentageDone) {}
public void thumbnailComplete(ImageReader source) {}
public void readAborted(ImageReader source) {}
}
BufferedImage getThumbnail(ImageInputStream iis,
JPEGImageReader reader)
throws IOException {
iis.mark();
iis.seek(streamPos);
JPEGImageReader thumbReader = new JPEGImageReader(null);
thumbReader.setInput(iis);
thumbReader.addIIOReadProgressListener
(new ThumbnailReadListener(reader));
BufferedImage ret = thumbReader.read(0, null);
thumbReader.dispose();
iis.reset();
return ret;
}
protected Object clone() {
JFIFThumbJPEG newGuy = (JFIFThumbJPEG) super.clone();
if (thumbMetadata != null) {
newGuy.thumbMetadata = (JPEGMetadata) thumbMetadata.clone();
}
return newGuy;
}
IIOMetadataNode getNativeNode() {
IIOMetadataNode node = new IIOMetadataNode("JFIFthumbJPEG");
if (thumbMetadata != null) {
node.appendChild(thumbMetadata.getNativeTree());
}
return node;
}
int getLength() {
if (data == null) {
return 0;
} else {
return data.length;
}
}
void write(ImageOutputStream ios,
JPEGImageWriter writer) throws IOException {
int progInterval = data.length / 20; // approx. every 5%
if (progInterval == 0) {
progInterval = 1;
}
for (int offset = 0;
offset < data.length;) {
int len = Math.min(progInterval, data.length-offset);
ios.write(data, offset, len);
offset += progInterval;
float percentDone = ((float) offset * 100) / data.length;
if (percentDone > 100.0F) {
percentDone = 100.0F;
}
writer.thumbnailProgress (percentDone);
}
}
void print () {
System.out.println("JFIF thumbnail stored as JPEG");
}
}
/**
* Write out the given profile to the stream, embedded in
* the necessary number of APP2 segments, per the ICC spec.
* This is the only mechanism for writing an ICC profile
* to a stream.
*/
static void writeICC(ICC_Profile profile, ImageOutputStream ios)
throws IOException {
int LENGTH_LENGTH = 2;
final String ID = "ICC_PROFILE";
int ID_LENGTH = ID.length()+1; // spec says it's null-terminated
int COUNTS_LENGTH = 2;
int MAX_ICC_CHUNK_SIZE =
65535 - LENGTH_LENGTH - ID_LENGTH - COUNTS_LENGTH;
byte [] data = profile.getData();
int numChunks = data.length / MAX_ICC_CHUNK_SIZE;
if ((data.length % MAX_ICC_CHUNK_SIZE) != 0) {
numChunks++;
}
int chunkNum = 1;
int offset = 0;
for (int i = 0; i < numChunks; i++) {
int dataLength = Math.min(data.length-offset, MAX_ICC_CHUNK_SIZE);
int segLength = dataLength+COUNTS_LENGTH+ID_LENGTH+LENGTH_LENGTH;
ios.write(0xff);
ios.write(JPEG.APP2);
MarkerSegment.write2bytes(ios, segLength);
byte [] id = ID.getBytes("US-ASCII");
ios.write(id);
ios.write(0); // Null-terminate the string
ios.write(chunkNum++);
ios.write(numChunks);
ios.write(data, offset, dataLength);
offset += dataLength;
}
}
/**
* An APP2 marker segment containing an ICC profile. In the stream
* a profile larger than 64K is broken up into a series of chunks.
* This inner class represents the complete profile as a single object,
* combining chunks as necessary.
*/
class ICCMarkerSegment extends MarkerSegment {
ArrayList chunks = null;
byte [] profile = null; // The complete profile when it's fully read
// May remain null when writing
private static final int ID_SIZE = 12;
int chunksRead;
int numChunks;
ICCMarkerSegment(ICC_ColorSpace cs) {
super(JPEG.APP2);
chunks = null;
chunksRead = 0;
numChunks = 0;
profile = cs.getProfile().getData();
}
ICCMarkerSegment(JPEGBuffer buffer) throws IOException {
super(buffer); // gets whole segment or fills the buffer
if (debug) {
System.out.println("Creating new ICC segment");
}
buffer.bufPtr += ID_SIZE; // Skip the id
buffer.bufAvail -= ID_SIZE;
/*
* Reduce the stored length by the id size. The stored
* length is used to store the length of the profile
* data only.
*/
length -= ID_SIZE;
// get the chunk number
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