- /*
- * @(#)SOFMarkerSegment.java 1.6 03/12/19
- *
- * Copyright 2004 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);
- }
- }
-
- }