/*
* 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;
class PpmFileInfo extends FileInfo {
private final int max;
private final float scale;
private final int bytesPerSample;
public PpmFileInfo(final int width, final int height, final boolean rawbits, final int max) throws ImageReadException {
super(width, height, rawbits);
if (max <= 0) {
throw new ImageReadException("PPM 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("PPM maxVal " + max + " is out of range [1;65535]");
}
this.max = max;
}
@Override
public boolean hasAlpha() {
return false;
}
@Override
public int getNumComponents() {
return 3;
}
@Override
public int getBitDepth() {
return max;
}
@Override
public ImageFormat getImageType() {
return ImageFormats.PPM;
}
@Override
public String getImageTypeDescription() {
return "PPM: portable pixmap file format";
}
@Override
public String getMIMEType() {
return "image/x-portable-pixmap";
}
@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, max);
green = scaleSample(green, scale, max);
blue = scaleSample(blue, scale, max);
final int alpha = 0xff;
return ((0xff & alpha) << 24)
| ((0xff & red) << 16)
| ((0xff & green) << 8)
| ((0xff & blue) << 0);
}
@Override
public int getRGB(final WhiteSpaceReader wsr) throws IOException {
int red = Integer.parseInt(wsr.readtoWhiteSpace());
int green = Integer.parseInt(wsr.readtoWhiteSpace());
int blue = Integer.parseInt(wsr.readtoWhiteSpace());
red = scaleSample(red, scale, max);
green = scaleSample(green, scale, max);
blue = scaleSample(blue, scale, max);
final int alpha = 0xff;
return ((0xff & alpha) << 24)
| ((0xff & red) << 16)
| ((0xff & green) << 8)
| ((0xff & blue) << 0);
}
}