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
032    public PhotometricInterpreterPalette(final int samplesPerPixel,
033            final int[] bitsPerSample, final int predictor, final int width, final int height,
034            final int[] colorMap) {
035        super(samplesPerPixel, bitsPerSample, predictor, width, height);
036
037        final int bitsPerPixel = getBitsPerSample(0);
038        final int colormapScale = (1 << bitsPerPixel);
039        indexColorMap = new int[colormapScale];
040        for (int index = 0; index < colormapScale; index++) {
041            final int red = (colorMap[index] >> 8) & 0xff;
042            final int green = (colorMap[index + (colormapScale)] >> 8) & 0xff;
043            final int blue = (colorMap[index + (2 * colormapScale)] >> 8) & 0xff;
044            indexColorMap[index] = 0xff000000 | (red << 16) | (green << 8)
045                    | blue;
046        }
047
048    }
049
050    @Override
051    public void interpretPixel(final ImageBuilder imageBuilder, final int[] samples, final int x,
052            final int y) throws ImageReadException, IOException {
053        imageBuilder.setRGB(x, y, indexColorMap[samples[0]]);
054    }
055}