| Constructors Summary |
|---|
DQTMarkerSegment(float quality, boolean needTwo) // Could be 1 to 4
super(JPEG.DQT);
tables.add(new Qtable(true, quality));
if (needTwo) {
tables.add(new Qtable(false, quality));
}
|
DQTMarkerSegment(JPEGBuffer buffer)
super(buffer);
int count = length;
while (count > 0) {
Qtable newGuy = new Qtable(buffer);
tables.add(newGuy);
count -= newGuy.data.length+1;
}
buffer.bufAvail -= length;
|
DQTMarkerSegment(JPEGQTable[] qtables)
super(JPEG.DQT);
for (int i = 0; i < qtables.length; i++) {
tables.add(new Qtable(qtables[i], i));
}
|
DQTMarkerSegment(Node node)
super(JPEG.DQT);
NodeList children = node.getChildNodes();
int size = children.getLength();
if ((size < 1) || (size > 4)) {
throw new IIOInvalidTreeException("Invalid DQT node", node);
}
for (int i = 0; i < size; i++) {
tables.add(new Qtable(children.item(i)));
}
|
| Methods Summary |
|---|
| protected java.lang.Object | clone()
DQTMarkerSegment newGuy = (DQTMarkerSegment) super.clone();
newGuy.tables = new ArrayList(tables.size());
Iterator iter = tables.iterator();
while (iter.hasNext()) {
Qtable table = (Qtable) iter.next();
newGuy.tables.add(table.clone());
}
return newGuy;
|
| com.sun.imageio.plugins.jpeg.DQTMarkerSegment$Qtable | getChromaForLuma(com.sun.imageio.plugins.jpeg.DQTMarkerSegment$Qtable luma)Assuming the given table was generated by scaling the "standard"
visually lossless luminance table, extract the scale factor that
was used.
Qtable newGuy = null;
// Determine if the table is all the same values
// if so, use the same table
boolean allSame = true;
for (int i = 1; i < luma.QTABLE_SIZE; i++) {
if (luma.data[i] != luma.data[i-1]) {
allSame = false;
break;
}
}
if (allSame) {
newGuy = (Qtable) luma.clone();
newGuy.tableID = 1;
} else {
// Otherwise, find the largest coefficient less than 255. This is
// the largest value that we know did not clamp on scaling.
int largestPos = 0;
for (int i = 1; i < luma.QTABLE_SIZE; i++) {
if (luma.data[i] > luma.data[largestPos]) {
largestPos = i;
}
}
// Compute the scale factor by dividing it by the value in the
// same position from the "standard" table.
// If the given table was not generated by scaling the standard,
// the resulting table will still be reasonable, as it will reflect
// a comparable scaling of chrominance frequency response of the
// eye.
float scaleFactor = ((float)(luma.data[largestPos]))
/ ((float)(JPEGQTable.K1Div2Luminance.getTable()[largestPos]));
// generate a new table
JPEGQTable jpegTable =
JPEGQTable.K2Div2Chrominance.getScaledInstance(scaleFactor,
true);
newGuy = new Qtable(jpegTable, 1);
}
return newGuy;
|
| javax.imageio.metadata.IIOMetadataNode | getNativeNode()
IIOMetadataNode node = new IIOMetadataNode("dqt");
for (int i= 0; i<tables.size(); i++) {
Qtable table = (Qtable) tables.get(i);
node.appendChild(table.getNativeNode());
}
return node;
|
| com.sun.imageio.plugins.jpeg.DQTMarkerSegment$Qtable | getQtableFromNode(org.w3c.dom.Node node)
return new Qtable(node);
|
| void | print()
printTag("DQT");
System.out.println("Num tables: "
+ Integer.toString(tables.size()));
for (int i= 0; i<tables.size(); i++) {
Qtable table = (Qtable) tables.get(i);
table.print();
}
System.out.println();
|
| void | write(javax.imageio.stream.ImageOutputStream ios)Writes the data for this segment to the stream in
valid JPEG format.
// We don't write DQT segments; the IJG library does.
|
