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The Apache PDFBox library is an open source Java tool for working with PDF documents.
/*
* Copyright 2014 The Apache Software Foundation.
*
* Licensed 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.Point;
import java.awt.Rectangle;
import java.awt.geom.AffineTransform;
import java.awt.geom.Point2D;
import java.awt.image.ColorModel;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.pdfbox.pdmodel.graphics.color.PDSeparation;
import org.apache.pdfbox.util.Matrix;
/**
* Intermediate class extended by the shading types 4,5,6 and 7 that contains
* the common methods used by these classes.
*
* @author Shaola Ren
* @author Tilman Hausherr
*/
abstract class TriangleBasedShadingContext extends ShadingContext
{
private static final Log LOG = LogFactory.getLog(TriangleBasedShadingContext.class);
/**
* bits per coordinate.
*/
protected int bitsPerCoordinate;
/**
* number of color components.
*/
protected int numberOfColorComponents;
/**
* bits per color component
*/
protected int bitsPerColorComponent;
final protected boolean hasFunction;
public TriangleBasedShadingContext(PDShadingResources shading, ColorModel cm,
AffineTransform xform, Matrix ctm, int pageHeight, Rectangle dBounds)
throws IOException
{
super(shading, cm, xform, ctm, pageHeight, dBounds);
PDTriangleBasedShadingType triangleBasedShadingType = (PDTriangleBasedShadingType) shading;
hasFunction = shading.getFunction() != null;
bitsPerCoordinate = triangleBasedShadingType.getBitsPerCoordinate();
LOG.debug("bitsPerCoordinate: " + (Math.pow(2, bitsPerCoordinate) - 1));
bitsPerColorComponent = triangleBasedShadingType.getBitsPerComponent();
LOG.debug("bitsPerColorComponent: " + bitsPerColorComponent);
numberOfColorComponents = hasFunction ? 1 : colorSpace.getNumberOfComponents();
if (colorSpace instanceof PDSeparation)
{
// bug? PDSeparation.getNumberOfComponents() returns the number of components
// of the target colorant
numberOfColorComponents = 1;
}
}
// get the points from the triangles, calculate their color and add
// point-color mappings to the map
protected void calcPixelTable(ArrayList triangleList, HashMap map)
{
for (ShadedTriangle tri : triangleList)
{
int degree = tri.getDeg();
if (degree == 2)
{
Line line = tri.getLine();
for (Point p : line.linePoints)
{
map.put(p, convertToRGB(line.calcColor(p)));
}
}
else
{
int[] boundary = tri.getBoundary();
boundary[0] = Math.max(boundary[0], deviceBounds.x);
boundary[1] = Math.min(boundary[1], deviceBounds.x + deviceBounds.width);
boundary[2] = Math.max(boundary[2], deviceBounds.y);
boundary[3] = Math.min(boundary[3], deviceBounds.y + deviceBounds.height);
for (int x = boundary[0]; x <= boundary[1]; x++)
{
for (int y = boundary[2]; y <= boundary[3]; y++)
{
Point p = new Point(x, y);
if (tri.contains(p))
{
map.put(p, convertToRGB(tri.calcColor(p)));
}
}
}
}
}
}
// transform a point from source space to device space
protected void transformPoint(Point2D p, Matrix ctm, AffineTransform xform)
{
if (ctm != null)
{
ctm.createAffineTransform().transform(p, p);
}
xform.transform(p, p);
}
// convert color to RGB color value, using function if required,
// then convert from the shading colorspace to an RGB value,
// which is encoded into an integer.
@Override
protected int convertToRGB(float[] values)
{
if (hasFunction)
{
try
{
values = shading.evalFunction(values);
}
catch (IOException exception)
{
LOG.error("error while processing a function", exception);
}
}
return super.convertToRGB(values);
}
}