/*
* @(#)SOFMarkerSegment.java 1.7 05/11/17
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package com.sun.imageio.plugins.jpeg;
//import javax.imageio.IIOException;
import javax.imageio.metadata.IIOInvalidTreeException;
import javax.imageio.metadata.IIOMetadataNode;
import javax.imageio.stream.ImageOutputStream;
import java.io.IOException;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.NamedNodeMap;
/**
* An SOF (Start Of Frame) marker segment.
*/
class SOFMarkerSegment extends MarkerSegment {
int samplePrecision;
int numLines;
int samplesPerLine;
ComponentSpec [] componentSpecs; // Array size is num components
SOFMarkerSegment(boolean wantProg,
boolean wantExtended,
boolean willSubsample,
byte[] componentIDs,
int numComponents) {
super(wantProg ? JPEG.SOF2
: wantExtended ? JPEG.SOF1
: JPEG.SOF0);
samplePrecision = 8;
numLines = 0;
samplesPerLine = 0;
componentSpecs = new ComponentSpec[numComponents];
for(int i = 0; i < numComponents; i++) {
int factor = 1;
int qsel = 0;
if (willSubsample) {
factor = 2;
if ((i == 1) || (i == 2)) {
factor = 1;
qsel = 1;
}
}
componentSpecs[i] = new ComponentSpec(componentIDs[i], factor, qsel);
}
}
SOFMarkerSegment(JPEGBuffer buffer) throws IOException{
super(buffer);
samplePrecision = buffer.buf[buffer.bufPtr++];
numLines = (buffer.buf[buffer.bufPtr++] & 0xff) << 8;
numLines |= buffer.buf[buffer.bufPtr++] & 0xff;
samplesPerLine = (buffer.buf[buffer.bufPtr++] & 0xff) << 8;
samplesPerLine |= buffer.buf[buffer.bufPtr++] & 0xff;
int numComponents = buffer.buf[buffer.bufPtr++];
componentSpecs = new ComponentSpec [numComponents];
for (int i = 0; i < numComponents; i++) {
componentSpecs[i] = new ComponentSpec(buffer);
}
buffer.bufAvail -= length;
}
SOFMarkerSegment(Node node) throws IIOInvalidTreeException {
// All attributes are optional, so setup defaults first
super(JPEG.SOF0);
samplePrecision = 8;
numLines = 0;
samplesPerLine = 0;
updateFromNativeNode(node, true);
}
protected Object clone() {
SOFMarkerSegment newGuy = (SOFMarkerSegment) super.clone();
if (componentSpecs != null) {
newGuy.componentSpecs = (ComponentSpec []) componentSpecs.clone();
for (int i = 0; i < componentSpecs.length; i++) {
newGuy.componentSpecs[i] =
(ComponentSpec) componentSpecs[i].clone();
}
}
return newGuy;
}
IIOMetadataNode getNativeNode() {
IIOMetadataNode node = new IIOMetadataNode("sof");
node.setAttribute("process", Integer.toString(tag-JPEG.SOF0));
node.setAttribute("samplePrecision",
Integer.toString(samplePrecision));
node.setAttribute("numLines",
Integer.toString(numLines));
node.setAttribute("samplesPerLine",
Integer.toString(samplesPerLine));
node.setAttribute("numFrameComponents",
Integer.toString(componentSpecs.length));
for (int i = 0; i < componentSpecs.length; i++) {
node.appendChild(componentSpecs[i].getNativeNode());
}
return node;
}
void updateFromNativeNode(Node node, boolean fromScratch)
throws IIOInvalidTreeException {
NamedNodeMap attrs = node.getAttributes();
int value = getAttributeValue(node, attrs, "process", 0, 2, false);
tag = (value != -1) ? value+JPEG.SOF0 : tag;
// If samplePrecision is present, it must be 8.
// This just checks. We don't bother to assign the value.
value = getAttributeValue(node, attrs, "samplePrecision", 8, 8, false);
value = getAttributeValue(node, attrs, "numLines", 0, 65535, false);
numLines = (value != -1) ? value : numLines;
value = getAttributeValue(node, attrs, "samplesPerLine", 0, 65535, false);
samplesPerLine = (value != -1) ? value : samplesPerLine;
int numComponents = getAttributeValue(node, attrs, "numFrameComponents",
1, 4, false);
NodeList children = node.getChildNodes();
if (children.getLength() != numComponents) {
throw new IIOInvalidTreeException
("numFrameComponents must match number of children", node);
}
componentSpecs = new ComponentSpec [numComponents];
for (int i = 0; i < numComponents; i++) {
componentSpecs[i] = new ComponentSpec(children.item(i));
}
}
/**
* Writes the data for this segment to the stream in
* valid JPEG format.
*/
void write(ImageOutputStream ios) throws IOException {
// We don't write SOF segments; the IJG library does.
}
void print () {
printTag("SOF");
System.out.print("Sample precision: ");
System.out.println(samplePrecision);
System.out.print("Number of lines: ");
System.out.println(numLines);
System.out.print("Samples per line: ");
System.out.println(samplesPerLine);
System.out.print("Number of components: ");
System.out.println(componentSpecs.length);
for(int i = 0; i<componentSpecs.length; i++) {
componentSpecs[i].print();
}
}
int getIDencodedCSType () {
for (int i = 0; i < componentSpecs.length; i++) {
if (componentSpecs[i].componentId < 'A') {
return JPEG.JCS_UNKNOWN;
}
}
switch(componentSpecs.length) {
case 3:
if ((componentSpecs[0].componentId == 'R')
&&(componentSpecs[0].componentId == 'G')
&&(componentSpecs[0].componentId == 'B')) {
return JPEG.JCS_RGB;
}
if ((componentSpecs[0].componentId == 'Y')
&&(componentSpecs[0].componentId == 'C')
&&(componentSpecs[0].componentId == 'c')) {
return JPEG.JCS_YCC;
}
break;
case 4:
if ((componentSpecs[0].componentId == 'R')
&&(componentSpecs[0].componentId == 'G')
&&(componentSpecs[0].componentId == 'B')
&&(componentSpecs[0].componentId == 'A')) {
return JPEG.JCS_RGBA;
}
if ((componentSpecs[0].componentId == 'Y')
&&(componentSpecs[0].componentId == 'C')
&&(componentSpecs[0].componentId == 'c')
&&(componentSpecs[0].componentId == 'A')) {
return JPEG.JCS_YCCA;
}
}
return JPEG.JCS_UNKNOWN;
}
ComponentSpec getComponentSpec(byte id, int factor, int qSelector) {
return new ComponentSpec(id, factor, qSelector);
}
/**
* A component spec within an SOF marker segment.
*/
class ComponentSpec implements Cloneable {
int componentId;
int HsamplingFactor;
int VsamplingFactor;
int QtableSelector;
ComponentSpec(byte id, int factor, int qSelector) {
componentId = id;
HsamplingFactor = factor;
VsamplingFactor = factor;
QtableSelector = qSelector;
}
ComponentSpec(JPEGBuffer buffer) {
// Parent already did a loadBuf
componentId = buffer.buf[buffer.bufPtr++];
HsamplingFactor = buffer.buf[buffer.bufPtr] >>> 4;
VsamplingFactor = buffer.buf[buffer.bufPtr++] & 0xf;
QtableSelector = buffer.buf[buffer.bufPtr++];
}
ComponentSpec(Node node) throws IIOInvalidTreeException {
NamedNodeMap attrs = node.getAttributes();
componentId = getAttributeValue(node, attrs, "componentId", 0, 255, true);
HsamplingFactor = getAttributeValue(node, attrs, "HsamplingFactor",
1, 255, true);
VsamplingFactor = getAttributeValue(node, attrs, "VsamplingFactor",
1, 255, true);
QtableSelector = getAttributeValue(node, attrs, "QtableSelector",
0, 3, true);
}
protected Object clone() {
try {
return super.clone();
} catch (CloneNotSupportedException e) {} // won't happen
return null;
}
IIOMetadataNode getNativeNode() {
IIOMetadataNode node = new IIOMetadataNode("componentSpec");
node.setAttribute("componentId",
Integer.toString(componentId));
node.setAttribute("HsamplingFactor",
Integer.toString(HsamplingFactor));
node.setAttribute("VsamplingFactor",
Integer.toString(VsamplingFactor));
node.setAttribute("QtableSelector",
Integer.toString(QtableSelector));
return node;
}
void print () {
System.out.print("Component ID: ");
System.out.println(componentId);
System.out.print("H sampling factor: ");
System.out.println(HsamplingFactor);
System.out.print("V sampling factor: ");
System.out.println(VsamplingFactor);
System.out.print("Q table selector: ");
System.out.println(QtableSelector);
}
}
}