| /* |
| * 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.ImageFormats; |
| import org.apache.commons.imaging.ImageInfo; |
| import org.apache.commons.imaging.ImageReadException; |
| |
| public class PamFileInfo extends FileInfo { |
| private final int depth; |
| private final int maxval; |
| private final float scale; |
| private final int bytesPerSample; |
| private final boolean hasAlpha; |
| private final TupleReader tupleReader; |
| |
| PamFileInfo(final int width, final int height, final int depth, final int maxval, final String tupleType) throws ImageReadException { |
| super(width, height, true); |
| this.depth = depth; |
| this.maxval = maxval; |
| if (maxval <= 0) { |
| throw new ImageReadException("PAM maxVal " + maxval |
| + " is out of range [1;65535]"); |
| } else if (maxval <= 255) { |
| scale = 255f; |
| bytesPerSample = 1; |
| } else if (maxval <= 65535) { |
| scale = 65535f; |
| bytesPerSample = 2; |
| } else { |
| throw new ImageReadException("PAM maxVal " + maxval |
| + " is out of range [1;65535]"); |
| } |
| |
| hasAlpha = tupleType.endsWith("_ALPHA"); |
| if (tupleType.equals("BLACKANDWHITE") || tupleType.equals("BLACKANDWHITE_ALPHA")) { |
| tupleReader = new GrayscaleTupleReader(ImageInfo.COLOR_TYPE_BW); |
| } else if (tupleType.equals("GRAYSCALE") || tupleType.equals("GRAYSCALE_ALPHA")) { |
| tupleReader = new GrayscaleTupleReader(ImageInfo.COLOR_TYPE_GRAYSCALE); |
| } else if (tupleType.equals("RGB") || tupleType.equals("RGB_ALPHA")) { |
| tupleReader = new ColorTupleReader(); |
| } else { |
| throw new ImageReadException("Unknown PAM tupletype '" + tupleType + "'"); |
| } |
| } |
| |
| @Override |
| public boolean hasAlpha() { |
| return hasAlpha; |
| } |
| |
| @Override |
| public int getNumComponents() { |
| return depth; |
| } |
| |
| @Override |
| public int getBitDepth() { |
| return maxval; |
| } |
| |
| @Override |
| public ImageFormat getImageType() { |
| return ImageFormats.PAM; |
| } |
| |
| @Override |
| public String getImageTypeDescription() { |
| return "PAM: portable arbitrary map file format"; |
| } |
| |
| @Override |
| public String getMIMEType() { |
| return "image/x-portable-arbitrary-map"; |
| } |
| |
| @Override |
| public int getColorType() { |
| return tupleReader.getColorType(); |
| } |
| |
| @Override |
| public int getRGB(final WhiteSpaceReader wsr) throws IOException { |
| throw new UnsupportedOperationException("PAM files are only ever binary"); |
| } |
| |
| @Override |
| public int getRGB(final InputStream is) throws IOException { |
| return tupleReader.getRGB(is); |
| } |
| |
| private abstract class TupleReader { |
| public abstract int getColorType(); |
| public abstract int getRGB(InputStream is) throws IOException; |
| } |
| |
| private class GrayscaleTupleReader extends TupleReader { |
| private final int colorType; |
| |
| public GrayscaleTupleReader(final int colorType) { |
| this.colorType = colorType; |
| } |
| |
| @Override |
| public int getColorType() { |
| return colorType; |
| } |
| |
| @Override |
| public int getRGB(final InputStream is) throws IOException { |
| int sample = readSample(is, bytesPerSample); |
| sample = scaleSample(sample, scale, maxval); |
| |
| int alpha = 0xff; |
| if (hasAlpha) { |
| alpha = readSample(is, bytesPerSample); |
| alpha = scaleSample(alpha, scale, maxval); |
| } |
| |
| final int rgb = ((0xff & alpha) << 24) | ((0xff & sample) << 16) |
| | ((0xff & sample) << 8) | ((0xff & sample) << 0); |
| |
| return rgb; |
| } |
| } |
| |
| private class ColorTupleReader extends TupleReader { |
| @Override |
| public int getColorType() { |
| return ImageInfo.COLOR_TYPE_RGB; |
| } |
| |
| @Override |
| public int getRGB(final InputStream is) throws IOException { |
| int red = readSample(is, bytesPerSample); |
| int green = readSample(is, bytesPerSample); |
| int blue = readSample(is, bytesPerSample); |
| |
| red = scaleSample(red, scale, maxval); |
| green = scaleSample(green, scale, maxval); |
| blue = scaleSample(blue, scale, maxval); |
| |
| int alpha = 0xff; |
| if (hasAlpha) { |
| alpha = readSample(is, bytesPerSample); |
| alpha = scaleSample(alpha, scale, maxval); |
| } |
| |
| final int rgb = ((0xff & alpha) << 24) | ((0xff & red) << 16) |
| | ((0xff & green) << 8) | ((0xff & blue) << 0); |
| |
| return rgb; |
| } |
| } |
| } |