Type4ShadingContext.java
/*
* 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.
*/
package org.apache.pdfbox.pdmodel.graphics.shading;
import java.awt.Rectangle;
import java.awt.geom.AffineTransform;
import java.awt.image.ColorModel;
import java.io.IOException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.pdfbox.util.Matrix;
/**
* AWT PaintContext for Gouraud Triangle Mesh (Type 4) shading.
*
* @author Tilman Hausherr
* @author Shaola Ren
*/
class Type4ShadingContext extends GouraudShadingContext
{
private static final Log LOG = LogFactory.getLog(Type4ShadingContext.class);
private final int bitsPerFlag;
/**
* Constructor creates an instance to be used for fill operations.
*
* @param shading the shading type to be used
* @param cm the color model to be used
* @param xform transformation for user to device space
* @param matrix the pattern matrix concatenated with that of the parent content stream
*/
Type4ShadingContext(PDShadingType4 shading, ColorModel cm, AffineTransform xform,
Matrix matrix, Rectangle deviceBounds) throws IOException
{
super(shading, cm, xform, matrix);
LOG.debug("Type4ShadingContext");
bitsPerFlag = shading.getBitsPerFlag();
//TODO handle cases where bitperflag isn't 8
LOG.debug("bitsPerFlag: " + bitsPerFlag);
setTriangleList(shading.collectTriangles(xform, matrix));
createPixelTable(deviceBounds);
}
}