PDShadingType4.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.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
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 4 (Free-Form Gouraud-Shaded Triangle Mesh).
*/
public class PDShadingType4 extends PDTriangleBasedShadingType
{
private static final Log LOG = LogFactory.getLog(PDShadingType4.class);
/**
* Constructor using the given shading dictionary.
*
* @param shadingDictionary the dictionary for this shading
*/
public PDShadingType4(COSDictionary shadingDictionary)
{
super(shadingDictionary);
}
@Override
public int getShadingType()
{
return PDShading.SHADING_TYPE4;
}
/**
* The bits per flag of this shading. This will return -1 if one has not
* been set.
*
* @return The number of bits per flag.
*/
public int getBitsPerFlag()
{
return getCOSObject().getInt(COSName.BITS_PER_FLAG, -1);
}
/**
* Set the number of bits per flag.
*
* @param bitsPerFlag the number of bits per flag
*/
public void setBitsPerFlag(int bitsPerFlag)
{
getCOSObject().setInt(COSName.BITS_PER_FLAG, bitsPerFlag);
}
@Override
public Paint toPaint(Matrix matrix)
{
return new Type4ShadingPaint(this, matrix);
}
@SuppressWarnings("squid:S1166")
@Override
List<ShadedTriangle> collectTriangles(AffineTransform xform, Matrix matrix)
throws IOException
{
int bitsPerFlag = getBitsPerFlag();
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();
}
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<ShadedTriangle> list = new ArrayList<>();
long maxSrcCoord = (long) Math.pow(2, getBitsPerCoordinate()) - 1;
long maxSrcColor = (long) Math.pow(2, getBitsPerComponent()) - 1;
COSStream stream = (COSStream) dict;
try (ImageInputStream mciis = new MemoryCacheImageInputStream(stream.createInputStream()))
{
byte flag = (byte) 0;
try
{
flag = (byte) (mciis.readBits(bitsPerFlag) & 3);
}
catch (EOFException ex)
{
LOG.error(ex);
}
boolean eof = false;
while (!eof)
{
Vertex p0;
Vertex p1;
Vertex p2;
Point2D[] ps;
float[][] cs;
int lastIndex;
try
{
switch (flag)
{
case 0:
p0 = readVertex(mciis, maxSrcCoord, maxSrcColor, rangeX, rangeY, colRange,
matrix, xform);
flag = (byte) (mciis.readBits(bitsPerFlag) & 3);
if (flag != 0)
{
LOG.error("bad triangle: " + flag);
}
p1 = readVertex(mciis, maxSrcCoord, maxSrcColor, rangeX, rangeY, colRange,
matrix, xform);
mciis.readBits(bitsPerFlag);
if (flag != 0)
{
LOG.error("bad triangle: " + flag);
}
p2 = readVertex(mciis, maxSrcCoord, maxSrcColor, rangeX, rangeY, colRange,
matrix, xform);
ps = new Point2D[] { p0.point, p1.point, p2.point };
cs = new float[][] { p0.color, p1.color, p2.color };
list.add(new ShadedTriangle(ps, cs));
flag = (byte) (mciis.readBits(bitsPerFlag) & 3);
break;
case 1:
case 2:
lastIndex = list.size() - 1;
if (lastIndex < 0)
{
LOG.error("broken data stream: " + list.size());
}
else
{
ShadedTriangle preTri = list.get(lastIndex);
p2 = readVertex(mciis, maxSrcCoord, maxSrcColor, rangeX, rangeY,
colRange, matrix, xform);
ps = new Point2D[] { flag == 1 ? preTri.corner[1] : preTri.corner[0],
preTri.corner[2],
p2.point };
cs = new float[][] { flag == 1 ? preTri.color[1] : preTri.color[0],
preTri.color[2],
p2.color };
list.add(new ShadedTriangle(ps, cs));
flag = (byte) (mciis.readBits(bitsPerFlag) & 3);
}
break;
default:
LOG.warn("bad flag: " + flag);
break;
}
}
catch (EOFException ex)
{
eof = true;
}
}
}
return list;
}
}