/*
* 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.sanselan.formats.png;
import org.apache.sanselan.SanselanConstants;
public interface PngConstants extends SanselanConstants
{
public static final int COMPRESSION_DEFLATE_INFLATE = 0;
public final static byte[] IHDR_CHUNK_TYPE = new byte[] { 73, 72, 68, 82 };
public final static byte[] PLTE_CHUNK_TYPE = new byte[] { 80, 76, 84, 69 };
public final static byte[] IEND_CHUNK_TYPE = new byte[] { 73, 69, 78, 68 };
public final static byte[] IDAT_CHUNK_TYPE = new byte[] { 73, 68, 65, 84 };
public final static byte[] iTXt_CHUNK_TYPE = new byte[] { //
105, //
84, //
88, //
116, //
};
public final static byte[] tEXt_CHUNK_TYPE = new byte[] { //
0x74, //
0x45, //
0x58, //
0x74, //
};
public final static byte[] zTXt_CHUNK_TYPE = new byte[] { //
0x7A, //
0x54, //
0x58, //
0x74, //
};
public final static int IEND = PngImageParser.CharsToQuad('I', 'E', 'N',
'D');
public final static int IHDR = PngImageParser.CharsToQuad('I', 'H', 'D',
'R');
public final static int iCCP = PngImageParser.CharsToQuad('i', 'C', 'C',
'P');
public final static int tEXt = PngImageParser.CharsToQuad('t', 'E', 'X',
't');
public final static int zTXt = PngImageParser.CharsToQuad('z', 'T', 'X',
't');
public final static int pHYs = PngImageParser.CharsToQuad('p', 'H', 'Y',
's');
public final static int PLTE = PngImageParser.CharsToQuad('P', 'L', 'T',
'E');
public final static int IDAT = PngImageParser.CharsToQuad('I', 'D', 'A',
'T');
public final static int tRNS = PngImageParser.CharsToQuad('t', 'R', 'N',
'S');
public final static int gAMA = PngImageParser.CharsToQuad('g', 'A', 'M',
'A');
public final static int sRGB = PngImageParser.CharsToQuad('s', 'R', 'G',
'B');
// XMP chunk type.
public final static int iTXt = PngImageParser.CharsToQuad('i', 'T', 'X',
't');
public static final byte PNG_Signature[] = {
(byte) 0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A, };
public static final String PARAM_KEY_PNG_BIT_DEPTH = "PNG_BIT_DEPTH";
public static final String PARAM_KEY_PNG_FORCE_INDEXED_COLOR = "PNG_FORCE_INDEXED_COLOR";
public static final String PARAM_KEY_PNG_FORCE_TRUE_COLOR = "PNG_FORCE_TRUE_COLOR";
// public static final Object PARAM_KEY_PNG_BIT_DEPTH_YES = "YES";
// public static final Object PARAM_KEY_PNG_BIT_DEPTH_NO = "NO";
public static final int COLOR_TYPE_GREYSCALE = 0;
public static final int COLOR_TYPE_TRUE_COLOR = 2;
public static final int COLOR_TYPE_INDEXED_COLOR = 3;
public static final int COLOR_TYPE_GREYSCALE_WITH_ALPHA = 4;
public static final int COLOR_TYPE_TRUE_COLOR_WITH_ALPHA = 6;
public static final byte COMPRESSION_TYPE_INFLATE_DEFLATE = 0;
public static final byte FILTER_METHOD_ADAPTIVE = 0;
public static final byte INTERLACE_METHOD_NONE = 0;
public static final byte INTERLACE_METHOD_ADAM7 = 1;
public static final byte FILTER_TYPE_NONE = 0;
public static final byte FILTER_TYPE_SUB = 1;
public static final byte FILTER_TYPE_UP = 2;
public static final byte FILTER_TYPE_AVERAGE = 3;
public static final byte FILTER_TYPE_PAETH = 4;
/*
* Background colour Solid background colour to be used when presenting the
* image if no better option is available. Gamma and chromaticity Gamma
* characteristic of the image with respect to the desired output intensity,
* and chromaticity characteristics of the RGB values used in the image. ICC
* profile Description of the colour space (in the form of an International
* Color Consortium (ICC) profile) to which the samples in the image
* conform. Image histogram Estimates of how frequently the image uses each
* palette entry. Physical pixel dimensions Intended pixel size and aspect
* ratio to be used in presenting the PNG image. Significant bits The number
* of bits that are significant in the samples. sRGB colour space A
* rendering intent (as defined by the International Color Consortium) and
* an indication that the image samples conform to this colour space.
* Suggested palette A reduced palette that may be used when the display
* device is not capable of displaying the full range of colours in the
* image. Textual data Textual information (which may be compressed)
* associated with the image. Time The time when the PNG image was last
* modified. Transparency Alpha information that allows the reference image
* to be reconstructed when the alpha channel is not retained in the PNG
* image.
*/
public final String XMP_KEYWORD = "XML:com.adobe.xmp";
/**
* Parameter key.
*
* Only used when writing Png images.
* <p>
* Valid values: a list of WriteTexts.
* <p>
*/
public static final String PARAM_KEY_PNG_TEXT_CHUNKS = "PNG_TEXT_CHUNKS";
}