org.apache.commons.imaging.formats.png.ChunkType Maven / Gradle / Ivy
/*
* 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 org.apache.commons.imaging.formats.png;
import java.io.UnsupportedEncodingException;
import org.apache.commons.imaging.common.BinaryFunctions;
/**
* Type of a PNG chunk.
*
* @see Portable Network Graphics Specification - Chunk specifications
*/
public enum ChunkType {
/** Image header */
IHDR,
/** Palette */
PLTE,
/** Image data */
IDAT,
/** Image trailer */
IEND,
/** Transparency */
tRNS,
/** Primary chromaticities and white point */
cHRM,
/** Image gamma */
gAMA,
/** Embedded ICC profile */
iCCP,
/** Significant bits*/
sBIT,
/** Standard RGB colour space */
sRGB,
/** Textual data */
tEXt,
/** Compressed textual data */
zTXt,
/** International textual data */
iTXt,
/** Background colour */
bKGD,
/** Image histogram */
hIST,
/** Physical pixel dimensions */
pHYs,
/** Suggested palette */
sPLT,
/** Image last-modification time */
tIME;
final byte[] array;
final int value;
private ChunkType() {
char[] chars = name().toCharArray();
try {
array = name().getBytes("UTF-8");
} catch (UnsupportedEncodingException e) {
// will not happen since UTF-8 is one of the StandardCharsets of the Java platform
throw new RuntimeException(e);
}
value = BinaryFunctions.charsToQuad(chars[0], chars[1], chars[2], chars[3]);
}
}