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; 020import java.util.Arrays; 021 022import org.apache.commons.imaging.ImagingException; 023import org.apache.commons.imaging.ImagingFormatException; 024import org.apache.commons.imaging.common.AllocationRequestException; 025import org.apache.commons.imaging.common.Allocator; 026import org.apache.commons.imaging.common.ImageBuilder; 027 028public class PhotometricInterpreterPalette extends PhotometricInterpreter { 029 030 /** 031 * The color map of integer ARGB values tied to the pixel index of the palette. 032 */ 033 private final int[] indexColorMap; 034 private final int bitsPerPixelMask; 035 036 /** 037 * Constructs a new instance. 038 * 039 * @param samplesPerPixel Samples per pixel. 040 * @param bitsPerSample Bits per sample. 041 * @param predictor TODO 042 * @param width TODO 043 * @param height TODO 044 * @param colorMap TODO 045 * 046 * @throws ImagingFormatException if an index into the {@code colorMap} is out of bounds. 047 * @throws AllocationRequestException Thrown when an allocation request exceeds the {@link Allocator} limit. 048 */ 049 public PhotometricInterpreterPalette(final int samplesPerPixel, final int[] bitsPerSample, final int predictor, final int width, final int height, 050 final int[] colorMap) { 051 super(samplesPerPixel, bitsPerSample, predictor, width, height); 052 053 final int bitsPerPixel = getBitsPerSample(0); 054 final int colorMapScale = 1 << bitsPerPixel; 055 int colorMapScaleX2; 056 try { 057 colorMapScaleX2 = Math.multiplyExact(2, colorMapScale); 058 } catch (final ArithmeticException e) { 059 throw new ImagingFormatException("bitsPerPixel is too large or colorMap is too small", e); 060 } 061 // Validate colorMap[i], colorMap[i + colorMapScale], and colorMap[i + colorMapScaleX2] where max(i) is 062 // colorMapScale - 1. 063 int maxI; 064 try { 065 maxI = Math.addExact(colorMapScaleX2, colorMapScale - 1); 066 } catch (final ArithmeticException e) { 067 throw new ImagingFormatException("bitsPerPixel is too large or colorMap is too small", e); 068 } 069 if (maxI >= colorMap.length) { 070 throw new ImagingFormatException("bitsPerPixel %,d (maxI = %,d) is too large or colorMap is too small %,d", bitsPerPixel, maxI, colorMap.length); 071 } 072 indexColorMap = Allocator.intArray(colorMapScale); 073 Arrays.setAll(indexColorMap, i -> { 074 final int red = colorMap[i] >> 8 & 0xff; 075 final int green = colorMap[i + colorMapScale] >> 8 & 0xff; 076 final int blue = colorMap[i + colorMapScaleX2] >> 8 & 0xff; 077 return 0xff000000 | red << 16 | green << 8 | blue; 078 }); 079 080 // Fix for IMAGING-247 5/17/2020 081 // This interpreter is used with TIFF_COMPRESSION_PACKBITS (32773). 082 // which unpacks to 8 bits per sample. But if the bits-per-pixel 083 // is less than 8 bits, some authoring tools do not zero-out the 084 // unused bits. This results in cases where the decoded by index 085 // exceeds the size of the palette. So we set up a mask to protect 086 // the code from an array bounds exception. 087 int temp = 0; 088 for (int i = 0; i < bitsPerPixel; i++) { 089 temp = temp << 1 | 1; 090 } 091 bitsPerPixelMask = temp; 092 093 } 094 095 @Override 096 public void interpretPixel(final ImageBuilder imageBuilder, final int[] samples, final int x, final int y) throws ImagingException, IOException { 097 imageBuilder.setRgb(x, y, indexColorMap[samples[0] & bitsPerPixelMask]); 098 } 099}