/*
* 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.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 org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.pdmodel.common.PDRange;
import org.apache.pdfbox.util.Matrix;
/**
* AWT PaintContext for tensor-product patch meshes (type 7) shading. This was
* done as part of GSoC2014, Tilman Hausherr is the mentor.
*
* @author Shaola Ren
*/
class Type7ShadingContext extends PatchMeshesShadingContext
{
/**
* Constructor creates an instance to be used for fill operations.
*
* @param shading the shading type to be used
* @param colorModel the color model to be used
* @param xform transformation for user to device space
* @param ctm current transformation matrix
* @param dBounds device bounds
* @throws IOException if something went wrong
*/
public Type7ShadingContext(PDShadingType7 shading, ColorModel colorModel, AffineTransform xform,
Matrix ctm, Rectangle dBounds) throws IOException
{
super(shading, colorModel, xform, ctm, dBounds);
patchList = getTensorPatchList(xform, ctm);
pixelTable = calcPixelTable();
}
// get the patch list which forms the type 7 shading image from data stream
private ArrayList<Patch> getTensorPatchList(AffineTransform xform, Matrix ctm) throws IOException
{
PDShadingType7 tensorShadingType = (PDShadingType7) patchMeshesShadingType;
COSDictionary cosDictionary = tensorShadingType.getCOSDictionary();
PDRange rangeX = tensorShadingType.getDecodeForParameter(0);
PDRange rangeY = tensorShadingType.getDecodeForParameter(1);
PDRange[] colRange = new PDRange[numberOfColorComponents];
for (int i = 0; i < numberOfColorComponents; ++i)
{
colRange[i] = tensorShadingType.getDecodeForParameter(2 + i);
}
return getPatchList(xform, ctm, cosDictionary, rangeX, rangeY, colRange, 16);
}
@Override
protected Patch generatePatch(Point2D[] points, float[][] color)
{
return new TensorPatch(points, color);
}
}