/*
* 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.geom.Point2D;
import java.awt.image.ColorModel;
import java.io.EOFException;
import java.io.IOException;
import java.util.ArrayList;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.stream.MemoryCacheImageInputStream;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSStream;
import org.apache.pdfbox.pdmodel.common.PDRange;
import org.apache.pdfbox.util.Matrix;
/**
* AWT PaintContext for Gouraud Triangle Lattice (Type 5) shading.
*
* @author Tilman Hausherr
* @author Shaola Ren
*/
class Type5ShadingContext extends GouraudShadingContext
{
private static final Log LOG = LogFactory.getLog(Type5ShadingContext.class);
/**
* 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 ctm current transformation matrix
* @throws IOException if something went wrong
*/
public Type5ShadingContext(PDShadingType5 shading, ColorModel cm, AffineTransform xform,
Matrix ctm, Rectangle dBounds) throws IOException
{
super(shading, cm, xform, ctm, dBounds);
LOG.debug("Type5ShadingContext");
triangleList = getTriangleList(xform, ctm);
pixelTable = calcPixelTable();
}
private ArrayList<ShadedTriangle> getTriangleList(AffineTransform xform, Matrix ctm) throws IOException
{
ArrayList<ShadedTriangle> list = new ArrayList<ShadedTriangle>();
PDShadingType5 latticeTriangleShadingType = (PDShadingType5) shading;
COSDictionary cosDictionary = latticeTriangleShadingType.getCOSDictionary();
PDRange rangeX = latticeTriangleShadingType.getDecodeForParameter(0);
PDRange rangeY = latticeTriangleShadingType.getDecodeForParameter(1);
int numPerRow = latticeTriangleShadingType.getVerticesPerRow();
PDRange[] colRange = new PDRange[numberOfColorComponents];
for (int i = 0; i < numberOfColorComponents; ++i)
{
colRange[i] = latticeTriangleShadingType.getDecodeForParameter(2 + i);
}
ArrayList<Vertex> vlist = new ArrayList<Vertex>();
long maxSrcCoord = (long) Math.pow(2, bitsPerCoordinate) - 1;
long maxSrcColor = (long) Math.pow(2, bitsPerColorComponent) - 1;
COSStream cosStream = (COSStream) cosDictionary;
ImageInputStream mciis = new MemoryCacheImageInputStream(cosStream.getUnfilteredStream());
while (true)
{
Vertex p;
try
{
p = readVertex(mciis, maxSrcCoord, maxSrcColor, rangeX, rangeY, colRange, ctm, xform);
vlist.add(p);
}
catch (EOFException ex)
{
break;
}
}
int sz = vlist.size(), rowNum = sz / numPerRow;
Vertex[][] latticeArray = new Vertex[rowNum][numPerRow];
if (rowNum < 2)
{
return triangleList;
}
for (int i = 0; i < rowNum; i++)
{
for (int j = 0; j < numPerRow; j++)
{
latticeArray[i][j] = vlist.get(i * numPerRow + j);
}
}
for (int i = 0; i < rowNum - 1; i++)
{
for (int j = 0; j < numPerRow - 1; j++)
{
Point2D[] ps = new Point2D[]
{
latticeArray[i][j].point, latticeArray[i][j + 1].point, latticeArray[i + 1][j].point
};
float[][] cs = new float[][]
{
latticeArray[i][j].color, latticeArray[i][j + 1].color, latticeArray[i + 1][j].color
};
list.add(new ShadedTriangle(ps, cs));
ps = new Point2D[]
{
latticeArray[i][j + 1].point, latticeArray[i + 1][j].point, latticeArray[i + 1][j + 1].point
};
cs = new float[][]
{
latticeArray[i][j + 1].color, latticeArray[i + 1][j].color, latticeArray[i + 1][j + 1].color
};
list.add(new ShadedTriangle(ps, cs));
}
}
return list;
}
}