| /* |
| * 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 org.apache.commons.imaging.SanselanConstants; |
| import org.apache.commons.imaging.common.BinaryConstant; |
| import org.apache.commons.imaging.common.BinaryFileFunctions; |
| |
| public interface PngConstants extends SanselanConstants |
| { |
| |
| public static final int COMPRESSION_DEFLATE_INFLATE = 0; |
| |
| public final static BinaryConstant IHDR_CHUNK_TYPE = new BinaryConstant(new byte[] { 73, 72, 68, 82 }); |
| public final static BinaryConstant PLTE_CHUNK_TYPE = new BinaryConstant(new byte[] { 80, 76, 84, 69 }); |
| public final static BinaryConstant IEND_CHUNK_TYPE = new BinaryConstant(new byte[] { 73, 69, 78, 68 }); |
| public final static BinaryConstant IDAT_CHUNK_TYPE = new BinaryConstant(new byte[] { 73, 68, 65, 84 }); |
| public final static BinaryConstant iTXt_CHUNK_TYPE = new BinaryConstant(new byte[] { // |
| 105, // |
| 84, // |
| 88, // |
| 116, // |
| }); |
| public final static BinaryConstant tEXt_CHUNK_TYPE = new BinaryConstant(new byte[] { // |
| 0x74, // |
| 0x45, // |
| 0x58, // |
| 0x74, // |
| }); |
| public final static BinaryConstant zTXt_CHUNK_TYPE = new BinaryConstant(new byte[] { // |
| 0x7A, // |
| 0x54, // |
| 0x58, // |
| 0x74, // |
| }); |
| public final static BinaryConstant IPHYS_CHUNK_TYPE = new BinaryConstant(new byte[] { |
| 'p', |
| 'H', |
| 'Y', |
| 's' |
| }); |
| |
| public final static int IEND = BinaryFileFunctions.charsToQuad('I', 'E', 'N', |
| 'D'); |
| public final static int IHDR = BinaryFileFunctions.charsToQuad('I', 'H', 'D', |
| 'R'); |
| public final static int iCCP = BinaryFileFunctions.charsToQuad('i', 'C', 'C', |
| 'P'); |
| public final static int tEXt = BinaryFileFunctions.charsToQuad('t', 'E', 'X', |
| 't'); |
| public final static int zTXt = BinaryFileFunctions.charsToQuad('z', 'T', 'X', |
| 't'); |
| public final static int pHYs = BinaryFileFunctions.charsToQuad('p', 'H', 'Y', |
| 's'); |
| public final static int PLTE = BinaryFileFunctions.charsToQuad('P', 'L', 'T', |
| 'E'); |
| public final static int IDAT = BinaryFileFunctions.charsToQuad('I', 'D', 'A', |
| 'T'); |
| public final static int tRNS = BinaryFileFunctions.charsToQuad('t', 'R', 'N', |
| 'S'); |
| public final static int gAMA = BinaryFileFunctions.charsToQuad('g', 'A', 'M', |
| 'A'); |
| public final static int sRGB = BinaryFileFunctions.charsToQuad('s', 'R', 'G', |
| 'B'); |
| |
| // XMP chunk type. |
| public final static int iTXt = BinaryFileFunctions.charsToQuad('i', 'T', 'X', |
| 't'); |
| |
| public static final BinaryConstant PNG_Signature = new BinaryConstant(new byte[]{ |
| (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"; |
| |
| } |
