| /* |
| * 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.common.BinaryConstant; |
| |
| public final class PngConstants { |
| |
| public static final int COMPRESSION_DEFLATE_INFLATE = 0; |
| |
| public static final BinaryConstant PNG_SIGNATURE = new BinaryConstant( |
| new byte[] { (byte) 0x89, 'P', 'N', 'G', '\r', '\n', 0x1A, '\n', }); |
| |
| 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 byte COMPRESSION_TYPE_INFLATE_DEFLATE = 0; |
| public static final byte FILTER_METHOD_ADAPTIVE = 0; |
| |
| /* |
| * 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 static 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"; |
| |
| /** |
| * Parameter key. Used in write operations to indicate the Physical Scale - sCAL. |
| * <p> |
| * Valid values: PhysicalScale |
| * <p> |
| * |
| * @see org.apache.commons.imaging.formats.png.PhysicalScale |
| */ |
| public static final String PARAM_KEY_PHYSICAL_SCALE = "PHYSICAL_SCALE_CHUNK"; |
| |
| private PngConstants() { |
| } |
| } |