pddevicergb.java

非常有用的操作pdf文件的java源码

/**
 * Copyright (c) 2004, www.pdfbox.org
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. Neither the name of pdfbox; nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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package org.pdfbox.pdmodel.graphics.color;

import java.awt.Transparency;

import java.awt.color.ColorSpace;

import java.awt.image.ColorModel;
import java.awt.image.ComponentColorModel;
import java.awt.image.DataBuffer;

import java.io.IOException;

/**
 * This class represents an RGB color space.
 *
 * @author <a href="mailto:[e-mail]">Ben Litchfield</a>
 * @version $Revision: 1.8 $
 */
public class PDDeviceRGB extends PDColorSpace
{
    /**
     * The name of this color space.
     */
    public static final String NAME = "DeviceRGB";

    /**
     * The abbreviated name of this color space.
     */
    public static final String ABBREVIATED_NAME = "RGB";
    
    /**
     * This is the single instance of this class.
     */
    public static final PDDeviceRGB INSTANCE = new PDDeviceRGB();
    
    /**
     * This class is immutable.
     */
    private PDDeviceRGB()
    {
        //only here to make immutable.
    }

    /**
     * This will return the name of the color space.
     *
     * @return The name of the color space.
     */
    public String getName()
    {
        return NAME;
    }

    /**
     * This will get the number of components that this color space is made up of.
     *
     * @return The number of components in this color space.
     *
     * @throws IOException If there is an error getting the number of color components.
     */
    public int getNumberOfComponents() throws IOException
    {
        return 3;
    }

    /**
     * Create a Java colorspace for this colorspace.
     *
     * @return A color space that can be used for Java AWT operations.
     *
     * @throws IOException If there is an error creating the color space.
     */
    public ColorSpace createColorSpace() throws IOException
    {        
        return ColorSpace.getInstance( ColorSpace.CS_sRGB );        
    }
    
    /**
     * Create a Java color model for this colorspace.
     *
     * @param bpc The number of bits per component.
     * 
     * @return A color model that can be used for Java AWT operations.
     *
     * @throws IOException If there is an error creating the color model.
     */
    public ColorModel createColorModel( int bpc ) throws IOException
    {        
        int[] nbBits = { bpc, bpc, bpc };
        ComponentColorModel componentColorModel = 
                new ComponentColorModel( createColorSpace(), 
                                         nbBits, 
                                         false,                     
                                         false,              
                                         Transparency.OPAQUE,
                                         DataBuffer.TYPE_BYTE );
        
        return componentColorModel;
    }
}