001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 018package org.apache.commons.imaging.formats.png; 019 020import java.util.Arrays; 021 022public enum PngColorType { 023 024 // FIXME can this be merged with ImageInfo.ColorType? 025 026 GREYSCALE(0, true, false, 1, new int[] { 1, 2, 4, 8, 16 }), TRUE_COLOR(2, false, false, 3, new int[] { 8, 16 }), 027 INDEXED_COLOR(3, false, false, 1, new int[] { 1, 2, 4, 8 }), GREYSCALE_WITH_ALPHA(4, true, true, 2, new int[] { 8, 16 }), 028 TRUE_COLOR_WITH_ALPHA(6, false, true, 4, new int[] { 8, 16 }); 029 030 static PngColorType getColorType(final boolean alpha, final boolean grayscale) { 031 if (grayscale) { 032 if (alpha) { 033 return PngColorType.GREYSCALE_WITH_ALPHA; 034 } 035 return PngColorType.GREYSCALE; 036 } 037 if (alpha) { 038 return PngColorType.TRUE_COLOR_WITH_ALPHA; 039 } 040 return PngColorType.TRUE_COLOR; 041 } 042 043 public static PngColorType getColorType(final int value) { 044 for (final PngColorType type : values()) { 045 if (type.value == value) { 046 return type; 047 } 048 } 049 050 return null; 051 } 052 053 private final int value; 054 private final boolean greyscale; 055 private final boolean alpha; 056 057 private final int samplesPerPixel; 058 059 private final int[] allowedBitDepths; 060 061 PngColorType(final int value, final boolean greyscale, final boolean alpha, final int samplesPerPixel, final int[] allowedBitDepths) { 062 this.value = value; 063 this.greyscale = greyscale; 064 this.alpha = alpha; 065 this.samplesPerPixel = samplesPerPixel; 066 this.allowedBitDepths = allowedBitDepths; 067 } 068 069 int getSamplesPerPixel() { 070 return samplesPerPixel; 071 } 072 073 int getValue() { 074 return value; 075 } 076 077 boolean hasAlpha() { 078 return alpha; 079 } 080 081 boolean isBitDepthAllowed(final int bitDepth) { 082 return Arrays.binarySearch(allowedBitDepths, bitDepth) >= 0; 083 } 084 085 boolean isGreyscale() { 086 return greyscale; 087 } 088}