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 */ 017package org.apache.commons.imaging.formats.tiff.photometricinterpreters; 018 019import java.io.IOException; 020 021import org.apache.commons.imaging.ImageReadException; 022import org.apache.commons.imaging.common.ImageBuilder; 023 024public class PhotometricInterpreterPalette extends PhotometricInterpreter { 025 026 /** 027 * The color map of integer ARGB values tied to the pixel index of the 028 * palette 029 */ 030 private final int[] indexColorMap; 031 private final int bitsPerPixelMask; 032 033 public PhotometricInterpreterPalette(final int samplesPerPixel, 034 final int[] bitsPerSample, final int predictor, final int width, final int height, 035 final int[] colorMap) { 036 super(samplesPerPixel, bitsPerSample, predictor, width, height); 037 038 final int bitsPerPixel = getBitsPerSample(0); 039 final int colormapScale = (1 << bitsPerPixel); 040 indexColorMap = new int[colormapScale]; 041 for (int index = 0; index < colormapScale; index++) { 042 final int red = (colorMap[index] >> 8) & 0xff; 043 final int green = (colorMap[index + (colormapScale)] >> 8) & 0xff; 044 final int blue = (colorMap[index + (2 * colormapScale)] >> 8) & 0xff; 045 indexColorMap[index] = 0xff000000 | (red << 16) | (green << 8) 046 | blue; 047 } 048 049 // Fix for IMAGING-247 5/17/2020 050 // This interpreter is used with TIFF_COMPRESSION_PACKBITS (32773). 051 // which unpacks to 8 bits per sample. But if the bits-per-pixel 052 // is less than 8 bits, some authoring tools do not zero-out the 053 // unused bits. This results in cases where the decoded by index 054 // exceeds the size of the palette. So we set up a mask to protect 055 // the code from an array bounds exception. 056 int temp = 0; 057 for (int i = 0; i < bitsPerPixel; i++) { 058 temp = (temp << 1) | 1; 059 } 060 bitsPerPixelMask = temp; 061 062 } 063 064 @Override 065 public void interpretPixel(final ImageBuilder imageBuilder, final int[] samples, final int x, 066 final int y) throws ImageReadException, IOException { 067 imageBuilder.setRGB(x, y, indexColorMap[samples[0] & bitsPerPixelMask]); 068 } 069}