public class JPEGImageReadParam extends ImageReadParam
getDefaultImageReadParam methods of the built-in JPEG ImageReader. The sole purpose of these additions is to allow the specification of tables for use in decoding abbreviated streams. The built-in JPEG reader will also accept an ordinary ImageReadParam, which is sufficient for decoding non-abbreviated streams.
While tables for abbreviated streams are often obtained by first reading another abbreviated stream containing only the tables, in some applications the tables are fixed ahead of time. This class allows the tables to be specified directly from client code. If no tables are specified either in the stream or in a JPEGImageReadParam, then the stream is presumed to use the "standard" visually lossless tables. See JPEGQTable and JPEGHuffmanTable for more information on the default tables.
The default JPEGImageReadParam returned by the getDefaultReadParam method of the builtin JPEG reader contains no tables. Default tables may be obtained from the table classes JPEGQTable and JPEGHuffmanTable.
If a stream does contain tables, the tables given in a JPEGImageReadParam are ignored. Furthermore, if the first image in a stream does contain tables and subsequent ones do not, then the tables given in the first image are used for all the abbreviated images. Once tables have been read from a stream, they can be overridden only by tables subsequently read from the same stream. In order to specify new tables, the setInput method of the reader must be called to change the stream.
Note that this class does not provide a means for obtaining the tables found in a stream. These may be extracted from a stream by consulting the IIOMetadata object returned by the reader.
For more information about the operation of the built-in JPEG plug-ins, see the JPEG metadata format specification and usage notes.
canSetSourceRenderSize, destination, destinationBands, minProgressivePass, numProgressivePasses, sourceRenderSize
controller, defaultController, destinationOffset, destinationType, sourceBands, sourceRegion, sourceXSubsampling, sourceYSubsampling, subsamplingXOffset, subsamplingYOffset
| Constructor | Description |
|---|---|
JPEGImageReadParam() |
Constructs a JPEGImageReadParam. |
| Modifier and Type | Method | Description |
|---|---|---|
boolean |
areTablesSet() |
Returns true if tables are currently set. |
JPEGHuffmanTable[] |
getACHuffmanTables() |
Returns a copy of the array of AC Huffman tables set on the most recent call to setDecodeTables, or null if tables are not currently set. |
JPEGHuffmanTable[] |
getDCHuffmanTables() |
Returns a copy of the array of DC Huffman tables set on the most recent call to setDecodeTables, or null if tables are not currently set. |
JPEGQTable[] |
getQTables() |
Returns a copy of the array of quantization tables set on the most recent call to setDecodeTables, or null if tables are not currently set. |
void |
setDecodeTables |
Sets the quantization and Huffman tables to use in decoding abbreviated streams. |
void |
unsetDecodeTables() |
Removes any quantization and Huffman tables that are currently set. |
){kind=link}
canSetSourceRenderSize, getDestination, getDestinationBands, getSourceMaxProgressivePass, getSourceMinProgressivePass, getSourceNumProgressivePasses, getSourceRenderSize, setDestination, setDestinationBands, setSourceProgressivePasses, setSourceRenderSize
activateController, getController, getDefaultController, getDestinationOffset, getDestinationType, getSourceBands, getSourceRegion, getSourceXSubsampling, getSourceYSubsampling, getSubsamplingXOffset, getSubsamplingYOffset, hasController, setController, setDestinationOffset, setDestinationType, setSourceBands, setSourceRegion, setSourceSubsampling
public JPEGImageReadParam()
JPEGImageReadParam.public boolean areTablesSet()
true if tables are currently set.true if tables are present.public void setDecodeTables(JPEGQTable[] qTables, JPEGHuffmanTable[] DCHuffmanTables, JPEGHuffmanTable[] ACHuffmanTables)
null. The two arrays of Huffman tables must have the same number of elements. The table specifiers in the frame and scan headers in the stream are assumed to be equivalent to indices into these arrays. The argument arrays are copied by this method.qTables - an array of quantization table objects.DCHuffmanTables - an array of Huffman table objects.ACHuffmanTables - an array of Huffman table objects.IllegalArgumentException - if any of the arguments is null, has more than 4 elements, or if the numbers of DC and AC tables differ.public void unsetDecodeTables()
public JPEGQTable[] getQTables()
setDecodeTables, or null if tables are not currently set.JPEGQTable objects, or null.public JPEGHuffmanTable[] getDCHuffmanTables()
setDecodeTables, or null if tables are not currently set.JPEGHuffmanTable objects, or null.public JPEGHuffmanTable[] getACHuffmanTables()
setDecodeTables, or null if tables are not currently set.JPEGHuffmanTable objects, or null.
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https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/javax/imageio/plugins/jpeg/JPEGImageReadParam.html