PDShadingType5.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.Paint;
import java.awt.geom.AffineTransform;
import java.awt.geom.Point2D;
import java.io.EOFException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.stream.MemoryCacheImageInputStream;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSStream;
import org.apache.pdfbox.pdmodel.common.PDRange;
import org.apache.pdfbox.util.Matrix;
/**
* Resources for a shading type 5 (Lattice-Form Gouraud-Shade Triangle Mesh).
*/
public class PDShadingType5 extends PDTriangleBasedShadingType
{
/**
* Constructor using the given shading dictionary.
*
* @param shadingDictionary the dictionary for this shading
*/
public PDShadingType5(COSDictionary shadingDictionary)
{
super(shadingDictionary);
}
@Override
public int getShadingType()
{
return PDShading.SHADING_TYPE5;
}
/**
* The vertices per row of this shading. This will return -1 if one has not
* been set.
*
* @return the number of vertices per row
*/
public int getVerticesPerRow()
{
return getCOSObject().getInt(COSName.VERTICES_PER_ROW, -1);
}
/**
* Set the number of vertices per row.
*
* @param verticesPerRow the number of vertices per row
*/
public void setVerticesPerRow(int verticesPerRow)
{
getCOSObject().setInt(COSName.VERTICES_PER_ROW, verticesPerRow);
}
@Override
public Paint toPaint(Matrix matrix)
{
return new Type5ShadingPaint(this, matrix);
}
@SuppressWarnings("squid:S1166")
@Override
List<ShadedTriangle> collectTriangles(AffineTransform xform, Matrix matrix) throws IOException
{
COSDictionary dict = getCOSObject();
if (!(dict instanceof COSStream))
{
return Collections.emptyList();
}
PDRange rangeX = getDecodeForParameter(0);
PDRange rangeY = getDecodeForParameter(1);
if (rangeX == null || rangeY == null ||
Float.compare(rangeX.getMin(), rangeX.getMax()) == 0 ||
Float.compare(rangeY.getMin(), rangeY.getMax()) == 0)
{
return Collections.emptyList();
}
int numPerRow = getVerticesPerRow();
PDRange[] colRange = new PDRange[getNumberOfColorComponents()];
for (int i = 0; i < colRange.length; ++i)
{
colRange[i] = getDecodeForParameter(2 + i);
if (colRange[i] == null)
{
throw new IOException("Range missing in shading /Decode entry");
}
}
List<Vertex> vlist = new ArrayList<>();
long maxSrcCoord = (long) Math.pow(2, getBitsPerCoordinate()) - 1;
long maxSrcColor = (long) Math.pow(2, getBitsPerComponent()) - 1;
COSStream cosStream = (COSStream) dict;
try (ImageInputStream mciis = new MemoryCacheImageInputStream(cosStream.createInputStream()))
{
boolean eof = false;
while (!eof)
{
Vertex p;
try
{
p = readVertex(mciis, maxSrcCoord, maxSrcColor, rangeX, rangeY, colRange, matrix, xform);
vlist.add(p);
}
catch (EOFException ex)
{
eof = true;
}
}
}
int rowNum = vlist.size() / numPerRow;
if (rowNum < 2)
{
// must have at least two rows; if not, return empty list
return Collections.emptyList();
}
Vertex[][] latticeArray = new Vertex[rowNum][numPerRow];
for (int i = 0; i < rowNum; i++)
{
for (int j = 0; j < numPerRow; j++)
{
latticeArray[i][j] = vlist.get(i * numPerRow + j);
}
}
return createShadedTriangleList(rowNum, numPerRow, latticeArray);
}
private List<ShadedTriangle> createShadedTriangleList(int rowNum, int numPerRow, Vertex[][] latticeArray)
{
Point2D[] ps = new Point2D[3]; // array will be shallow-cloned in ShadedTriangle constructor
float[][] cs = new float[3][];
List<ShadedTriangle> list = new ArrayList<>();
for (int i = 0; i < rowNum - 1; i++)
{
for (int j = 0; j < numPerRow - 1; j++)
{
ps[0] = latticeArray[i][j].point;
ps[1] = latticeArray[i][j + 1].point;
ps[2] = latticeArray[i + 1][j].point;
cs[0] = latticeArray[i][j].color;
cs[1] = latticeArray[i][j + 1].color;
cs[2] = latticeArray[i + 1][j].color;
list.add(new ShadedTriangle(ps, cs));
ps[0] = latticeArray[i][j + 1].point;
ps[1] = latticeArray[i + 1][j].point;
ps[2] = latticeArray[i + 1][j + 1].point;
cs[0] = latticeArray[i][j + 1].color;
cs[1] = latticeArray[i + 1][j].color;
cs[2] = latticeArray[i + 1][j + 1].color;
list.add(new ShadedTriangle(ps, cs));
}
}
return list;
}
}