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- /*
- * 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.
- */
-
- /* $Id$ */
-
- package org.apache.fop.pdf;
-
- import java.util.ArrayList;
- import java.util.Arrays;
- import java.util.Collections;
- import java.util.List;
-
- import org.apache.fop.render.gradient.Function;
- import org.apache.fop.render.gradient.Function.SubFunctionRenderer;
- import org.apache.fop.render.gradient.GradientMaker;
- import org.apache.fop.render.gradient.GradientMaker.DoubleFormatter;
-
- /**
- * class representing a PDF Function.
- *
- * PDF Functions represent parameterized mathematical formulas and
- * sampled representations with
- * arbitrary resolution. Functions are used in two areas: device-dependent
- * rasterization information for halftoning and transfer
- * functions, and color specification for smooth shading (a PDF 1.3 feature).
- *
- * All PDF Functions have a FunctionType (0,2,3, or 4), a Domain, and a Range.
- */
- public class PDFFunction extends PDFObject {
-
- private final Function function;
-
- private final List<PDFFunction> pdfFunctions;
-
- /**
- * create an complete Function object of Type 2, an Exponential Interpolation function.
- *
- * Use null for an optional object parameter if you choose not to use it.
- * For optional int parameters, pass the default.
- *
- * @param domain List objects of Double objects.
- * This is the domain of the function.
- * See page 264 of the PDF 1.3 Spec.
- * @param range List of Doubles that is the Range of the function.
- * See page 264 of the PDF 1.3 Spec.
- * @param cZero This is a vector of Double objects which defines the function result
- * when x=0.
- *
- * This attribute is optional.
- * It's described on page 268 of the PDF 1.3 spec.
- * @param cOne This is a vector of Double objects which defines the function result
- * when x=1.
- *
- * This attribute is optional.
- * It's described on page 268 of the PDF 1.3 spec.
- * @param interpolationExponentN This is the inerpolation exponent.
- *
- * This attribute is required.
- * PDF Spec page 268
- */
- public PDFFunction(List<Double> domain, List<Double> range, float[] cZero, float[] cOne,
- double interpolationExponentN) {
- this(new Function(domain, range, cZero, cOne, interpolationExponentN));
-
- }
-
- @SuppressWarnings("unchecked")
- public PDFFunction(Function function) {
- this(function, Collections.EMPTY_LIST);
- }
-
- public PDFFunction(Function function, List<PDFFunction> pdfFunctions) {
- this.function = function;
- this.pdfFunctions = pdfFunctions;
- }
-
- public Function getFunction() {
- return function;
- }
-
- /**
- * represent as PDF. Whatever the FunctionType is, the correct
- * representation spits out. The sets of required and optional
- * attributes are different for each type, but if a required
- * attribute's object was constructed as null, then no error
- * is raised. Instead, the malformed PDF that was requested
- * by the construction is dutifully output.
- * This policy should be reviewed.
- *
- * @return the PDF string.
- */
- public byte[] toPDF() {
- return toByteString();
- }
-
-
- public byte[] toByteString() {
- List<String> functionsStrings = new ArrayList<String>(function.getFunctions().size());
- for (PDFFunction f : pdfFunctions) {
- functionsStrings.add(f.referencePDF());
- }
- SubFunctionRenderer subFunctionRenderer = new SubFunctionRenderer() {
-
- public void outputFunction(StringBuilder out, int functionIndex) {
- out.append(pdfFunctions.get(functionIndex).referencePDF());
- }
- };
- StringBuilder out = new StringBuilder();
- GradientMaker.DoubleFormatter doubleFormatter = new DoubleFormatter() {
-
- public String formatDouble(double d) {
- return PDFNumber.doubleOut(d);
- }
- };
- function.output(out, doubleFormatter, subFunctionRenderer);
- return encode(out.toString());
- }
-
- /** {@inheritDoc} */
- protected boolean contentEquals(PDFObject obj) {
- if (obj == null) {
- return false;
- }
- if (obj == this) {
- return true;
- }
- if (!(obj instanceof PDFFunction)) {
- return false;
- }
- Function func = ((PDFFunction) obj).function;
- if (function.getFunctionType() != func.getFunctionType()) {
- return false;
- }
- if (function.getBitsPerSample() != func.getBitsPerSample()) {
- return false;
- }
- if (function.getOrder() != func.getOrder()) {
- return false;
- }
- if (function.getInterpolationExponentN() != func.getInterpolationExponentN()) {
- return false;
- }
- if (function.getDomain() != null) {
- if (!function.getDomain().equals(func.getDomain())) {
- return false;
- }
- } else if (func.getDomain() != null) {
- return false;
- }
- if (function.getRange() != null) {
- if (!function.getRange().equals(func.getRange())) {
- return false;
- }
- } else if (func.getRange() != null) {
- return false;
- }
- if (function.getEncode() != null) {
- if (!function.getEncode().equals(func.getEncode())) {
- return false;
- }
- } else if (func.getEncode() != null) {
- return false;
- }
- if (!Arrays.equals(function.getCZero(), func.getCZero())) {
- return false;
- }
- if (!Arrays.equals(function.getCOne(), func.getCOne())) {
- return false;
- }
- if (!pdfFunctions.equals(((PDFFunction) obj).pdfFunctions)) {
- return false;
- }
- if (function.getBounds() != null) {
- if (!function.getBounds().equals(func.getBounds())) {
- return false;
- }
- } else if (func.getBounds() != null) {
- return false;
- }
- return true;
- }
-
- }
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