LinearTransfer.java :  » Graphic-Library » GLIPS-Graffiti-editor-1.5 » org » apache » batik » ext » awt » image » Java Open Source

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GLIPS Graffiti editor 1.5 » org » apache » batik » ext » awt » image » LinearTransfer.java
/*

   Copyright 2001  The Apache Software Foundation 

   Licensed 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.batik.ext.awt.image;

/**
 * LinearTransfer.java
 *
 * This class defines the Linear type transfer function for the
 * feComponentTransfer filter, as defined in chapter 15, section 11 of the SVG
 * specification.
 *
 * @author <a href="mailto:sheng.pei@sun.com">Sheng Pei</a>
 * @version $Id: LinearTransfer.java,v 1.1 2005/11/21 09:51:39 dev Exp $ 
 */
public class LinearTransfer implements TransferFunction {
    /**
     * This byte array stores the lookuptable data
     */
    public byte [] lutData;

    /**
     * The slope of the linear function
     */
    public float slope;

    /**
     * The intercept of the linear function
     */
    public float intercept;

    /**
     * Two floats as the input for the function
     */
    public LinearTransfer(float slope, float intercept){
        this.slope = slope;
        this.intercept = intercept;
    }

    /*
     * This method will build the lut data. Each entry's
     * value is in form of "slope*C+intercept"
     */
    private void buildLutData(){
        lutData = new byte [256];
        int j, value;
        float scaledInt = (intercept*255f)+0.5f;
        for (j=0; j<=255; j++){
            value = (int)(slope*j+scaledInt);
            if(value < 0){
                value = 0;
            }
            else if(value > 255){
                value = 255;
            }
            lutData[j] = (byte)(0xff & value);
        }

        /*System.out.println("Linear : " + slope + " / " + intercept);
        for(j=0; j<=255; j++){
            System.out.print("[" + j + "] = " + (0xff & lutData[j]) + " ");
        }

        System.out.println();*/
    }

    /**
     * This method will return the lut data in order
     * to construct a LookUpTable object
     */
    public byte [] getLookupTable(){
        buildLutData();
        return lutData;
    }
}
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