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Diffstat (limited to 'awt/javax/imageio/plugins/jpeg/JPEGImageReadParam.java')
-rw-r--r-- | awt/javax/imageio/plugins/jpeg/JPEGImageReadParam.java | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/awt/javax/imageio/plugins/jpeg/JPEGImageReadParam.java b/awt/javax/imageio/plugins/jpeg/JPEGImageReadParam.java new file mode 100644 index 0000000..2f3a9a8 --- /dev/null +++ b/awt/javax/imageio/plugins/jpeg/JPEGImageReadParam.java @@ -0,0 +1,123 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package javax.imageio.plugins.jpeg; + +import javax.imageio.ImageReadParam; + +/** + * The JPEGImageReadParam class provides functionality to set Huffman tables and + * quantization tables when using the JPEG reader plug-in. + * + * @since Android 1.0 + */ +public class JPEGImageReadParam extends ImageReadParam { + + /** + * The q tables. + */ + private JPEGQTable qTables[]; + + /** + * The dc huffman tables. + */ + private JPEGHuffmanTable dcHuffmanTables[]; + + /** + * The ac huffman tables. + */ + private JPEGHuffmanTable acHuffmanTables[]; + + /** + * Instantiates a new JPEGImageReadParam. + */ + public JPEGImageReadParam() { + } + + /** + * Returns true if tables are set, false otherwise. + * + * @return true, if tables are set, false otherwise. + */ + public boolean areTablesSet() { + return qTables != null; + } + + /** + * Sets the quantization and Huffman tables for using in decoding streams. + * + * @param qTables + * the quantization tables. + * @param DCHuffmanTables + * the standart DC Huffman tables. + * @param ACHuffmanTables + * the standart AC huffman tables. + */ + public void setDecodeTables(JPEGQTable[] qTables, JPEGHuffmanTable[] DCHuffmanTables, + JPEGHuffmanTable[] ACHuffmanTables) { + if (qTables == null || DCHuffmanTables == null || ACHuffmanTables == null) { + throw new IllegalArgumentException("Invalid JPEG table arrays"); + } + if (DCHuffmanTables.length != ACHuffmanTables.length) { + throw new IllegalArgumentException("Invalid JPEG table arrays"); + } + if (qTables.length > 4 || DCHuffmanTables.length > 4) { + throw new IllegalArgumentException("Invalid JPEG table arrays"); + } + + // Do the shallow copy, it should be enough + this.qTables = qTables.clone(); + dcHuffmanTables = DCHuffmanTables.clone(); + acHuffmanTables = ACHuffmanTables.clone(); + } + + /** + * Unset all decoded tables. + */ + public void unsetDecodeTables() { + qTables = null; + dcHuffmanTables = null; + acHuffmanTables = null; + } + + /** + * Gets the quantization tables. + * + * @return the quantization tables, or null. + */ + public JPEGQTable[] getQTables() { + return qTables == null ? null : qTables.clone(); + } + + /** + * Gets the DC Huffman tables. + * + * @return the DC Huffman tables which are set, or null. + */ + public JPEGHuffmanTable[] getDCHuffmanTables() { + return dcHuffmanTables == null ? null : dcHuffmanTables.clone(); + } + + /** + * Gets the AC Huffman tables. + * + * @return the AC Huffman tables which are set, or null. + */ + public JPEGHuffmanTable[] getACHuffmanTables() { + return acHuffmanTables == null ? null : acHuffmanTables.clone(); + } +} |