| /* |
| * 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. |
| */ |
| |
| /* $Id$ */ |
| |
| package org.apache.fop.fo.expr; |
| import org.apache.fop.apps.FOUserAgent; |
| import org.apache.fop.datatypes.PercentBase; |
| import org.apache.fop.datatypes.PercentBaseContext; |
| import org.apache.fop.fo.properties.ColorProperty; |
| import org.apache.fop.fo.properties.Property; |
| |
| /** |
| * Implements the cie-lab-color() function. |
| * @since XSL-FO 2.0 |
| */ |
| class CIELabColorFunction extends FunctionBase { |
| |
| /** {@inheritDoc} */ |
| public int getRequiredArgsCount() { |
| return 6; |
| } |
| |
| @Override |
| /** {@inheritDoc} */ |
| public PercentBase getPercentBase() { |
| return new CIELabPercentBase(); |
| } |
| |
| /** {@inheritDoc} */ |
| public Property eval(Property[] args, PropertyInfo pInfo) throws PropertyException { |
| |
| float red = args[0].getNumber().floatValue(); |
| float green = args[1].getNumber().floatValue(); |
| float blue = args[2].getNumber().floatValue(); |
| /* Verify sRGB replacement arguments */ |
| if ((red < 0 || red > 255) || (green < 0 || green > 255) || (blue < 0 || blue > 255)) { |
| throw new PropertyException("sRGB color values out of range. " |
| + "Arguments to cie-lab-color() must be [0..255] or [0%..100%]"); |
| } |
| |
| float l = args[3].getNumber().floatValue(); |
| float a = args[4].getNumber().floatValue(); |
| float b = args[5].getNumber().floatValue(); |
| if (l < 0 || l > 100) { |
| throw new PropertyException("L* value out of range. Valid range: [0..100]"); |
| } |
| if (a < -127 || a > 127 || b < -127 || b > 127) { |
| throw new PropertyException("a* and b* values out of range. Valid range: [-127..+127]"); |
| } |
| |
| StringBuffer sb = new StringBuffer(); |
| sb.append("cie-lab-color(" + red + "," + green + "," + blue + "," |
| + l + "," + a + "," + b + ")"); |
| FOUserAgent ua = (pInfo == null) |
| ? null |
| : (pInfo.getFO() == null ? null : pInfo.getFO().getUserAgent()); |
| return ColorProperty.getInstance(ua, sb.toString()); |
| } |
| |
| private static class CIELabPercentBase implements PercentBase { |
| public int getDimension() { |
| return 0; |
| } |
| |
| public double getBaseValue() { |
| return 1.0f; |
| } |
| |
| public int getBaseLength(PercentBaseContext context) { |
| return 0; |
| } |
| |
| } |
| |
| } |