org.apache.commons.imaging.formats.tiff.photometricinterpreters.PhotometricInterpreterPalette Maven / Gradle / Ivy
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Apache Commons Imaging (previously Sanselan) is a pure-Java image library.
/*
* 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.tiff.photometricinterpreters;
import java.io.IOException;
import org.apache.commons.imaging.ImageReadException;
import org.apache.commons.imaging.common.ImageBuilder;
public class PhotometricInterpreterPalette extends PhotometricInterpreter {
/**
* The color map of integer ARGB values tied to the pixel index of the
* palette
*/
private final int[] indexColorMap;
private final int bitsPerPixelMask;
public PhotometricInterpreterPalette(final int samplesPerPixel,
final int[] bitsPerSample, final int predictor, final int width, final int height,
final int[] colorMap) {
super(samplesPerPixel, bitsPerSample, predictor, width, height);
final int bitsPerPixel = getBitsPerSample(0);
final int colormapScale = (1 << bitsPerPixel);
indexColorMap = new int[colormapScale];
for (int index = 0; index < colormapScale; index++) {
final int red = (colorMap[index] >> 8) & 0xff;
final int green = (colorMap[index + (colormapScale)] >> 8) & 0xff;
final int blue = (colorMap[index + (2 * colormapScale)] >> 8) & 0xff;
indexColorMap[index] = 0xff000000 | (red << 16) | (green << 8)
| blue;
}
// Fix for IMAGING-247 5/17/2020
// This interpreter is used with TIFF_COMPRESSION_PACKBITS (32773).
// which unpacks to 8 bits per sample. But if the bits-per-pixel
// is less than 8 bits, some authoring tools do not zero-out the
// unused bits. This results in cases where the decoded by index
// exceeds the size of the palette. So we set up a mask to protect
// the code from an array bounds exception.
int temp = 0;
for (int i = 0; i < bitsPerPixel; i++) {
temp = (temp << 1) | 1;
}
bitsPerPixelMask = temp;
}
@Override
public void interpretPixel(final ImageBuilder imageBuilder, final int[] samples, final int x,
final int y) throws ImageReadException, IOException {
imageBuilder.setRGB(x, y, indexColorMap[samples[0] & bitsPerPixelMask]);
}
}