org.apache.pdfbox.pdmodel.graphics.color.PDDeviceRGB Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of pdfbox Show documentation
The Apache PDFBox library is an open source Java tool for working with PDF documents.
There is a newer version: 3.0.2
/*
 * 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.pdfbox.pdmodel.graphics.color;

import java.awt.color.ColorSpace;
import java.awt.image.BufferedImage;
import java.awt.image.WritableRaster;
import java.io.IOException;

import org.apache.pdfbox.cos.COSName;

/**
 * Colours in the DeviceRGB colour space are specified according to the additive
 * RGB (red-green-blue) colour model.
 *
 * @author Ben Litchfield
 * @author John Hewson
 */
public final class PDDeviceRGB extends PDDeviceColorSpace
{
    /**  This is the single instance of this class. */
    public static final PDDeviceRGB INSTANCE = new PDDeviceRGB();
    
    private final PDColor initialColor = new PDColor(new float[] { 0, 0, 0 }, this);
    private volatile ColorSpace awtColorSpace;

    private PDDeviceRGB()
    {
    }

    /**
     * Lazy setting of the AWT color space due to JDK race condition.
     */
    private void init()
    {
        // no need to synchronize this check as it is atomic
        if (awtColorSpace != null)
        {
            return;
        }

        synchronized (this)
        {
            // we might have been waiting for another thread, so check again
            if (awtColorSpace != null)
            {
                return;
            }
            awtColorSpace = ColorSpace.getInstance(ColorSpace.CS_sRGB);
            
            // there is a JVM bug which results in a CMMException which appears to be a race
            // condition caused by lazy initialization of the color transform, so we perform
            // an initial color conversion while we're still synchronized, see PDFBOX-2184
            awtColorSpace.toRGB(new float[] { 0, 0, 0, 0 });
        }
    }
    
    @Override
    public String getName()
    {
        return COSName.DEVICERGB.getName();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public int getNumberOfComponents()
    {
        return 3;
    }

    @Override
    public float[] getDefaultDecode(int bitsPerComponent)
    {
        return new float[] { 0, 1, 0, 1, 0, 1 };
    }

    @Override
    public PDColor getInitialColor()
    {
        return initialColor;
    }

    @Override
    public float[] toRGB(float[] value)
    {
        return value;
    }

    @Override
    public BufferedImage toRGBImage(WritableRaster raster) throws IOException
    {
        init();

        //
        // WARNING: this method is performance sensitive, modify with care!
        //
        // Please read PDFBOX-3854 and PDFBOX-2092 and look at the related commits first.
        // The current code returns TYPE_INT_RGB images which prevents slowness due to threads
        // blocking each other when TYPE_CUSTOM images are used.
        BufferedImage image = new BufferedImage(raster.getWidth(), raster.getHeight(), BufferedImage.TYPE_INT_RGB);
        image.setData(raster);
        return image;
    }
}