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The Apache PDFBox library is an open source Java tool for working with PDF documents.
/*
* 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 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 ctm current transformation matrix
* @param pageHeight height of the current page
*/
public Type4ShadingContext(PDShadingType4 shading, ColorModel cm, AffineTransform xform,
Matrix ctm, int pageHeight, Rectangle dBounds) throws IOException
{
super(shading, cm, xform, ctm, pageHeight, dBounds);
LOG.debug("Type4ShadingContext");
bitsPerFlag = shading.getBitsPerFlag();
LOG.debug("bitsPerFlag: " + bitsPerFlag); //TODO handle cases where bitperflag isn't 8
// PDFBOX-1966 flip the AffineTransform in 1.8 branch
xform.scale(1, -1);
xform.translate(0, -pageHeight);
triangleList = getTriangleList(xform, ctm);
pixelTable = calcPixelTable();
}
private ArrayList getTriangleList(AffineTransform xform, Matrix ctm) throws IOException
{
PDShadingType4 freeTriangleShadingType = (PDShadingType4) shading;
COSDictionary cosDictionary = freeTriangleShadingType.getCOSDictionary();
PDRange rangeX = freeTriangleShadingType.getDecodeForParameter(0);
PDRange rangeY = freeTriangleShadingType.getDecodeForParameter(1);
PDRange[] colRange = new PDRange[numberOfColorComponents];
for (int i = 0; i < numberOfColorComponents; ++i)
{
colRange[i] = freeTriangleShadingType.getDecodeForParameter(2 + i);
}
ArrayList list = new ArrayList();
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());
byte flag = (byte) 0;
try
{
flag = (byte) (mciis.readBits(bitsPerFlag) & 3);
}
catch (EOFException ex)
{
LOG.error(ex);
}
while (true)
{
Vertex p0, p1, p2;
Point2D[] ps;
float[][] cs;
int lastIndex;
try
{
switch (flag)
{
case 0:
p0 = readVertex(mciis, maxSrcCoord, maxSrcColor, rangeX, rangeY, colRange, ctm, xform);
flag = (byte) (mciis.readBits(bitsPerFlag) & 3);
if (flag != 0)
{
LOG.error("bad triangle: " + flag);
}
p1 = readVertex(mciis, maxSrcCoord, maxSrcColor, rangeX, rangeY, colRange, ctm, xform);
mciis.readBits(bitsPerFlag);
if (flag != 0)
{
LOG.error("bad triangle: " + flag);
}
p2 = readVertex(mciis, maxSrcCoord, maxSrcColor, rangeX, rangeY, colRange, ctm, 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:
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, ctm, xform);
ps = new Point2D[]
{
preTri.corner[1], preTri.corner[2], p2.point
};
cs = new float[][]
{
preTri.color[1], preTri.color[2], p2.color
};
list.add(new ShadedTriangle(ps, cs));
flag = (byte) (mciis.readBits(bitsPerFlag) & 3);
}
break;
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, ctm, xform);
ps = new Point2D[]
{
preTri.corner[0], preTri.corner[2], p2.point
};
cs = new float[][]
{
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)
{
break;
}
}
mciis.close();
return list;
}
}