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