/* * 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.pnm; import java.io.IOException; import java.io.InputStream; import org.apache.commons.imaging.ImageFormat; import org.apache.commons.imaging.ImageInfo; import org.apache.commons.imaging.ImageReadException; public class PgmFileInfo extends FileInfo { private final int max; private final float scale; private final int bytesPerSample; public PgmFileInfo(final int width, final int height, final boolean RAWBITS, final int max) throws ImageReadException { super(width, height, RAWBITS); if (max <= 0) { throw new ImageReadException("PGM maxVal " + max + " is out of range [1;65535]"); } else if (max <= 255) { scale = 255f; bytesPerSample = 1; } else if (max <= 65535) { scale = 65535f; bytesPerSample = 2; } else { throw new ImageReadException("PGM maxVal " + max + " is out of range [1;65535]"); } this.max = max; } @Override public boolean hasAlpha() { return false; } @Override public int getNumComponents() { return 1; } @Override public int getBitDepth() { return max; } @Override public ImageFormat getImageType() { return ImageFormat.IMAGE_FORMAT_PGM; } @Override public String getImageTypeDescription() { return "PGM: portable graymap file format"; } @Override public String getMIMEType() { return "image/x-portable-graymap"; } @Override public int getColorType() { return ImageInfo.COLOR_TYPE_GRAYSCALE; } @Override public int getRGB(final InputStream is) throws IOException { int sample = readSample(is, bytesPerSample); sample = scaleSample(sample, scale, max); final int alpha = 0xff; final int rgb = ((0xff & alpha) << 24) | ((0xff & sample) << 16) | ((0xff & sample) << 8) | ((0xff & sample) << 0); return rgb; } @Override public int getRGB(final WhiteSpaceReader wsr) throws IOException { int sample = Integer.parseInt(wsr.readtoWhiteSpace()); sample = scaleSample(sample, scale, max); final int alpha = 0xff; final int rgb = ((0xff & alpha) << 24) | ((0xff & sample) << 16) | ((0xff & sample) << 8) | ((0xff & sample) << 0); return rgb; } }