/*
* $Id: RGBColorFunction.java,v 1.2.2.1 2003/02/25 12:56:58 jeremias Exp $
* ============================================================================
* The Apache Software License, Version 1.1
* ============================================================================
*
* Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modifica-
* tion, 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. The end-user documentation included with the redistribution, if any, must
* include the following acknowledgment: "This product includes software
* developed by the Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself, if
* and wherever such third-party acknowledgments normally appear.
*
* 4. The names "FOP" and "Apache Software Foundation" must not be used to
* endorse or promote products derived from this software without prior
* written permission. For written permission, please contact
* apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache", nor may
* "Apache" appear in their name, without prior written permission of the
* Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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
* APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
* DING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* ============================================================================
*
* This software consists of voluntary contributions made by many individuals
* on behalf of the Apache Software Foundation and was originally created by
* James Tauber <jtauber@jtauber.com>. For more information on the Apache
* Software Foundation, please see <http://www.apache.org/>.
*/
package org.apache.fop.fo.expr;
import org.apache.fop.fo.Property;
import org.apache.fop.fo.ColorTypeProperty;
import org.apache.fop.datatypes.ColorType;
import org.apache.fop.datatypes.PercentBase;
class RGBColorFunction extends FunctionBase {
public int nbArgs() {
return 3;
}
/**
* Return an object which implements the PercentBase interface.
* Percents in arguments to this function are interpreted relative
* to 255.
*/
public PercentBase getPercentBase() {
return new RGBPercentBase();
}
public Property eval(Property[] args,
PropertyInfo pInfo) throws PropertyException {
// Using CSS rules, numbers are either supposed to be 0-255
// or percentage values. If percentages value, they've already
// been converted to reals.
float[] cfvals = new float[3]; // RGB
for (int i = 0; i < 3; i++) {
Number cval = args[i].getNumber();
if (cval == null) {
throw new PropertyException("Argument to rgb() must be a Number");
}
float colorVal = cval.floatValue() / 255f;
if (colorVal < 0.0 || colorVal > 255.0) {
throw new PropertyException("Arguments to rgb() must normalize to the range 0 to 1");
}
cfvals[i] = colorVal;
}
return new ColorTypeProperty(new ColorType(cfvals[0], cfvals[1],
cfvals[2]));
}
static class RGBPercentBase implements PercentBase {
public int getDimension() {
return 0;
}
public double getBaseValue() {
return 255f;
}
public int getBaseLength() {
return 0;
}
}
}