| /* |
| * 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.afp; |
| |
| import java.awt.Color; |
| |
| import org.apache.xmlgraphics.java2d.color.ColorConverter; |
| |
| import org.apache.fop.util.ColorUtil; |
| |
| /** |
| * Converts to grayscale using the standard RED=30%, GREEN=59% and BLUE=11% |
| * weights (see http://en.wikipedia.org/wiki/Grayscale) |
| */ |
| final class GrayScaleColorConverter implements ColorConverter { |
| |
| private static final int RED_WEIGHT = 77; |
| private static final int GREEN_WEIGTH = 150; |
| private static final int BLUE_WEIGHT = 28; |
| |
| private static final GrayScaleColorConverter SINGLETON = new GrayScaleColorConverter(); |
| |
| private GrayScaleColorConverter() { } |
| |
| /** |
| * static factory |
| * |
| * @return singleton instance of GrayScaleColorConverter |
| */ |
| public static GrayScaleColorConverter getInstance() { |
| return SINGLETON; |
| } |
| |
| /** |
| * The color is converted to CMYK with just the K component {@inheritDoc} |
| */ |
| public Color convert(Color color) { |
| |
| float kValue = (RED_WEIGHT * color.getRed() + GREEN_WEIGTH * color.getGreen() + BLUE_WEIGHT |
| * color.getBlue()) / 255.0f / 255.0f; |
| |
| return ColorUtil.toCMYKGrayColor(kValue); |
| } |
| } |