src/java/org/apache/fop/render/shading/FunctionPattern.java - xmlgraphics-fop - Git at Google

 /*
  * 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.render.shading;

 import java.io.UnsupportedEncodingException;

 import org.apache.fop.pdf.PDFFunction;
 import org.apache.fop.pdf.PDFNumber;
 import org.apache.fop.render.ps.svg.PSFunction;

 /**
  * A class for writing function objects for different output formats
  */
 public class FunctionPattern {

     private Function function;

     /**
      * Constructor
      * @param function The function from which to write the output
      */
     public FunctionPattern(Function function) {
         this.function = function;
     }

     /**
      * Outputs the function to a byte array
      */
     public String toWriteableString() {
         int vectorSize = 0;
         int numberOfFunctions = 0;
         int tempInt = 0;
         StringBuffer p = new StringBuffer(256);
         p.append("<< \n/FunctionType " + function.getFunctionType() + " \n");

         // FunctionType 0
         if (this.function.getFunctionType() == 0) {
             if (function.getDomain() != null) {
                 // DOMAIN
                 p.append("/Domain [ ");
                 vectorSize = function.getDomain().size();
                 for (tempInt = 0; tempInt < vectorSize; tempInt++) {
                     p.append(PDFNumber.doubleOut(function.getDomain().get(tempInt))
                              + " ");
                 }

                 p.append("] \n");
             } else {
                 p.append("/Domain [ 0 1 ] \n");
             }

             // SIZE
             if (function.getSize() != null) {
                 p.append("/Size [ ");
                 vectorSize = function.getSize().size();
                 for (tempInt = 0; tempInt < vectorSize; tempInt++) {
                     p.append(PDFNumber.doubleOut(function.getSize().get(tempInt))
                              + " ");
                 }
                 p.append("] \n");
             }
             // ENCODE
             if (function.getEncode() != null) {
                 p.append("/Encode [ ");
                 vectorSize = function.getEncode().size();
                 for (tempInt = 0; tempInt < vectorSize; tempInt++) {
                     p.append(PDFNumber.doubleOut(function.getEncode().get(tempInt))
                              + " ");
                 }
                 p.append("] \n");
             } else {
                 p.append("/Encode [ ");
                 vectorSize = function.getFunctions().size();
                 for (tempInt = 0; tempInt < vectorSize; tempInt++) {
                     p.append("0 1 ");
                 }
                 p.append("] \n");

             }

             // BITSPERSAMPLE
             p.append("/BitsPerSample " + function.getBitsPerSample());

             // ORDER (optional)
             if (function.getOrder() == 1 || function.getOrder() == 3) {
                 p.append(" \n/Order " + function.getOrder() + " \n");
             }

             // RANGE
             if (function.getRange() != null) {
                 p.append("/Range [ ");
                 vectorSize = function.getRange().size();
                 for (tempInt = 0; tempInt < vectorSize; tempInt++) {
                     p.append(PDFNumber.doubleOut(function.getRange().get(tempInt))
                              + " ");
                 }

                 p.append("] \n");
             }

             // DECODE
             if (function.getDecode() != null) {
                 p.append("/Decode [ ");
                 vectorSize = function.getDecode().size();
                 for (tempInt = 0; tempInt < vectorSize; tempInt++) {
                     p.append(PDFNumber.doubleOut(function.getDecode().get(tempInt))
                              + " ");
                 }

                 p.append("] \n");
             }

             // LENGTH
             if (function.getDataStream() != null) {
                 p.append("/Length " + (function.getDataStream().length() + 1)
                          + " \n");
             }

             // FILTER?
             if (function.getFilter() != null) {           // if there's a filter
                 vectorSize = function.getFilter().size();
                 p.append("/Filter ");
                 if (vectorSize == 1) {
                     p.append("/" + (function.getFilter().get(0))
                              + " \n");
                 } else {
                     p.append("[ ");
                     for (tempInt = 0; tempInt < vectorSize; tempInt++) {
                         p.append("/" + (function.getFilter().get(0))
                                  + " ");
                     }
                     p.append("] \n");
                 }
             }
             p.append(">>");

             // stream representing the function
             if (function.getDataStream() != null) {
                 p.append("\nstream\n" + function.getDataStream()
                          + "\nendstream");
             }

             // end of if FunctionType 0

         } else if (function.getFunctionType() == 2) {
             // DOMAIN
             if (function.getDomain() != null) {
                 p.append("/Domain [ ");
                 vectorSize = function.getDomain().size();
                 for (tempInt = 0; tempInt < vectorSize; tempInt++) {
                     p.append(PDFNumber.doubleOut(function.getDomain().get(tempInt))
                              + " ");
                 }

                 p.append("] \n");
             } else {
                 p.append("/Domain [ 0 1 ] \n");
             }


             // RANGE
             if (function.getRange() != null) {
                 p.append("/Range [ ");
                 vectorSize = function.getRange().size();
                 for (tempInt = 0; tempInt < vectorSize; tempInt++) {
                     p.append(PDFNumber.doubleOut(function.getRange().get(tempInt))
                              + " ");
                 }

                 p.append("] \n");
             }

             // FunctionType, C0, C1, N are required in PDF

             // C0
             if (function.getCZero() != null) {
                 p.append("/C0 [ ");
                 vectorSize = function.getCZero().size();
                 for (tempInt = 0; tempInt < vectorSize; tempInt++) {
                     p.append(PDFNumber.doubleOut(function.getCZero().get(tempInt))
                              + " ");
                 }
                 p.append("] \n");
             }

             // C1
             if (function.getCOne() != null) {
                 p.append("/C1 [ ");
                 vectorSize = function.getCOne().size();
                 for (tempInt = 0; tempInt < vectorSize; tempInt++) {
                     p.append(PDFNumber.doubleOut(function.getCOne().get(tempInt))
                              + " ");
                 }
                 p.append("] \n");
             }

             // N: The interpolation Exponent
             p.append("/N "
                      + PDFNumber.doubleOut(Double.valueOf(function.getInterpolationExponentN()))
                      + " \n");

             p.append(">>");

         } else if (function.getFunctionType()
                    == 3) {                       // fix this up when my eyes uncross
             // DOMAIN
             if (function.getDomain() != null) {
                 p.append("/Domain [ ");
                 vectorSize = function.getDomain().size();
                 for (tempInt = 0; tempInt < vectorSize; tempInt++) {
                     p.append(PDFNumber.doubleOut(function.getDomain().get(tempInt))
                              + " ");
                 }
                 p.append("] \n");
             } else {
                 p.append("/Domain [ 0 1 ] \n");
             }

             // RANGE
             if (function.getRange() != null) {
                 p.append("/Range [ ");
                 vectorSize = function.getRange().size();
                 for (tempInt = 0; tempInt < vectorSize; tempInt++) {
                     p.append(PDFNumber.doubleOut(function.getRange().get(tempInt))
                              + " ");
                 }

                 p.append("] \n");
             }

             // FUNCTIONS
             if (function.getFunctions() != null) {
                 p.append("/Functions [ ");
                 numberOfFunctions = function.getFunctions().size();
                 for (tempInt = 0; tempInt < numberOfFunctions; tempInt++) {
                     try {
                         if (function instanceof PSFunction) {
                             p.append(new String(function.getFunctions().get(tempInt).toByteString(), "UTF-8")
                                      + " ");
                         } else {
                             p.append(((PDFFunction)function.getFunctions().get(tempInt)).referencePDF()
                                     + " ");
                         }
                     } catch (UnsupportedEncodingException ex) {
                         //This should have been made an enum type to avoid throwing exceptions.
                     }
                 }
                 p.append("] \n");
             }


             // ENCODE
             if (function.getEncode() != null) {
                 p.append("/Encode [ ");
                 vectorSize = function.getEncode().size();
                 for (tempInt = 0; tempInt < vectorSize; tempInt++) {
                     p.append(PDFNumber.doubleOut(function.getEncode().get(tempInt))
                              + " ");
                 }

                 p.append("] \n");
             } else {
                 p.append("/Encode [ ");
                 vectorSize = function.getFunctions().size();
                 for (tempInt = 0; tempInt < vectorSize; tempInt++) {
                     p.append("0 1 ");
                 }
                 p.append("] \n");

             }


             // BOUNDS, required, but can be empty
             p.append("/Bounds [ ");
             if (function.getBounds() != null) {

                 vectorSize = function.getBounds().size();
                 for (tempInt = 0; tempInt < vectorSize; tempInt++) {
                     p.append(PDFNumber.doubleOut(function.getBounds().get(tempInt))
                              + " ");
                 }

             } else {
                 if (function.getFunctions() != null) {
                     // if there are n functions,
                     // there must be n-1 bounds.
                     // so let each function handle an equal portion
                     // of the whole. e.g. if there are 4, then [ 0.25 0.25 0.25 ]

                     String functionsFraction = PDFNumber.doubleOut(Double.valueOf(1.0
                             / (numberOfFunctions)));

                     for (tempInt = 0; tempInt + 1 < numberOfFunctions;
                             tempInt++) {

                         p.append(functionsFraction + " ");
                     }
                 }

             }
             p.append("]\n>>");
         } else if (function.getFunctionType()
                    == 4) {                       // fix this up when my eyes uncross
             // DOMAIN
             if (function.getDomain() != null) {
                 p.append("/Domain [ ");
                 vectorSize = function.getDomain().size();
                 for (tempInt = 0; tempInt < vectorSize; tempInt++) {
                     p.append(PDFNumber.doubleOut(function.getDomain().get(tempInt))
                              + " ");
                 }

                 p.append("] \n");
             } else {
                 p.append("/Domain [ 0 1 ] \n");
             }

             // RANGE
             if (function.getRange() != null) {
                 p.append("/Range [ ");
                 vectorSize = function.getRange().size();
                 for (tempInt = 0; tempInt < vectorSize; tempInt++) {
                     p.append(PDFNumber.doubleOut(function.getRange().get(tempInt))
                              + " ");
                 }

                 p.append("] \n");
             }

             // LENGTH
             if (function.getDataStream() != null) {
                 p.append("/Length " + (function.getDataStream().length() + 1)
                          + " \n");
             }

             p.append(">>");

             // stream representing the function
             if (function.getDataStream() != null) {
                 p.append("\nstream\n{ " + function.getDataStream()
                          + " }\nendstream");
             }
         }
         return p.toString();
     }
 }
	/*
	* 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.render.shading;

	import java.io.UnsupportedEncodingException;

	import org.apache.fop.pdf.PDFFunction;
	import org.apache.fop.pdf.PDFNumber;
	import org.apache.fop.render.ps.svg.PSFunction;

	/**
	* A class for writing function objects for different output formats
	*/
	public class FunctionPattern {

	private Function function;

	/**
	* Constructor
	* @param function The function from which to write the output
	*/
	public FunctionPattern(Function function) {
	this.function = function;
	}

	/**
	* Outputs the function to a byte array
	*/
	public String toWriteableString() {
	int vectorSize = 0;
	int numberOfFunctions = 0;
	int tempInt = 0;
	StringBuffer p = new StringBuffer(256);
	p.append("<< \n/FunctionType " + function.getFunctionType() + " \n");

	// FunctionType 0
	if (this.function.getFunctionType() == 0) {
	if (function.getDomain() != null) {
	// DOMAIN
	p.append("/Domain [ ");
	vectorSize = function.getDomain().size();
	for (tempInt = 0; tempInt < vectorSize; tempInt++) {
	p.append(PDFNumber.doubleOut(function.getDomain().get(tempInt))
	+ " ");
	}

	p.append("] \n");
	} else {
	p.append("/Domain [ 0 1 ] \n");
	}

	// SIZE
	if (function.getSize() != null) {
	p.append("/Size [ ");
	vectorSize = function.getSize().size();
	for (tempInt = 0; tempInt < vectorSize; tempInt++) {
	p.append(PDFNumber.doubleOut(function.getSize().get(tempInt))
	+ " ");
	}
	p.append("] \n");
	}
	// ENCODE
	if (function.getEncode() != null) {
	p.append("/Encode [ ");
	vectorSize = function.getEncode().size();
	for (tempInt = 0; tempInt < vectorSize; tempInt++) {
	p.append(PDFNumber.doubleOut(function.getEncode().get(tempInt))
	+ " ");
	}
	p.append("] \n");
	} else {
	p.append("/Encode [ ");
	vectorSize = function.getFunctions().size();
	for (tempInt = 0; tempInt < vectorSize; tempInt++) {
	p.append("0 1 ");
	}
	p.append("] \n");

	}

	// BITSPERSAMPLE
	p.append("/BitsPerSample " + function.getBitsPerSample());

	// ORDER (optional)
	if (function.getOrder() == 1 \|\| function.getOrder() == 3) {
	p.append(" \n/Order " + function.getOrder() + " \n");
	}

	// RANGE
	if (function.getRange() != null) {
	p.append("/Range [ ");
	vectorSize = function.getRange().size();
	for (tempInt = 0; tempInt < vectorSize; tempInt++) {
	p.append(PDFNumber.doubleOut(function.getRange().get(tempInt))
	+ " ");
	}

	p.append("] \n");
	}

	// DECODE
	if (function.getDecode() != null) {
	p.append("/Decode [ ");
	vectorSize = function.getDecode().size();
	for (tempInt = 0; tempInt < vectorSize; tempInt++) {
	p.append(PDFNumber.doubleOut(function.getDecode().get(tempInt))
	+ " ");
	}

	p.append("] \n");
	}

	// LENGTH
	if (function.getDataStream() != null) {
	p.append("/Length " + (function.getDataStream().length() + 1)
	+ " \n");
	}

	// FILTER?
	if (function.getFilter() != null) { // if there's a filter
	vectorSize = function.getFilter().size();
	p.append("/Filter ");
	if (vectorSize == 1) {
	p.append("/" + (function.getFilter().get(0))
	+ " \n");
	} else {
	p.append("[ ");
	for (tempInt = 0; tempInt < vectorSize; tempInt++) {
	p.append("/" + (function.getFilter().get(0))
	+ " ");
	}
	p.append("] \n");
	}
	}
	p.append(">>");

	// stream representing the function
	if (function.getDataStream() != null) {
	p.append("\nstream\n" + function.getDataStream()
	+ "\nendstream");
	}

	// end of if FunctionType 0

	} else if (function.getFunctionType() == 2) {
	// DOMAIN
	if (function.getDomain() != null) {
	p.append("/Domain [ ");
	vectorSize = function.getDomain().size();
	for (tempInt = 0; tempInt < vectorSize; tempInt++) {
	p.append(PDFNumber.doubleOut(function.getDomain().get(tempInt))
	+ " ");
	}

	p.append("] \n");
	} else {
	p.append("/Domain [ 0 1 ] \n");
	}


	// RANGE
	if (function.getRange() != null) {
	p.append("/Range [ ");
	vectorSize = function.getRange().size();
	for (tempInt = 0; tempInt < vectorSize; tempInt++) {
	p.append(PDFNumber.doubleOut(function.getRange().get(tempInt))
	+ " ");
	}

	p.append("] \n");
	}

	// FunctionType, C0, C1, N are required in PDF

	// C0
	if (function.getCZero() != null) {
	p.append("/C0 [ ");
	vectorSize = function.getCZero().size();
	for (tempInt = 0; tempInt < vectorSize; tempInt++) {
	p.append(PDFNumber.doubleOut(function.getCZero().get(tempInt))
	+ " ");
	}
	p.append("] \n");
	}

	// C1
	if (function.getCOne() != null) {
	p.append("/C1 [ ");
	vectorSize = function.getCOne().size();
	for (tempInt = 0; tempInt < vectorSize; tempInt++) {
	p.append(PDFNumber.doubleOut(function.getCOne().get(tempInt))
	+ " ");
	}
	p.append("] \n");
	}

	// N: The interpolation Exponent
	p.append("/N "
	+ PDFNumber.doubleOut(Double.valueOf(function.getInterpolationExponentN()))
	+ " \n");

	p.append(">>");

	} else if (function.getFunctionType()
	== 3) { // fix this up when my eyes uncross
	// DOMAIN
	if (function.getDomain() != null) {
	p.append("/Domain [ ");
	vectorSize = function.getDomain().size();
	for (tempInt = 0; tempInt < vectorSize; tempInt++) {
	p.append(PDFNumber.doubleOut(function.getDomain().get(tempInt))
	+ " ");
	}
	p.append("] \n");
	} else {
	p.append("/Domain [ 0 1 ] \n");
	}

	// RANGE
	if (function.getRange() != null) {
	p.append("/Range [ ");
	vectorSize = function.getRange().size();
	for (tempInt = 0; tempInt < vectorSize; tempInt++) {
	p.append(PDFNumber.doubleOut(function.getRange().get(tempInt))
	+ " ");
	}

	p.append("] \n");
	}

	// FUNCTIONS
	if (function.getFunctions() != null) {
	p.append("/Functions [ ");
	numberOfFunctions = function.getFunctions().size();
	for (tempInt = 0; tempInt < numberOfFunctions; tempInt++) {
	try {
	if (function instanceof PSFunction) {
	p.append(new String(function.getFunctions().get(tempInt).toByteString(), "UTF-8")
	+ " ");
	} else {
	p.append(((PDFFunction)function.getFunctions().get(tempInt)).referencePDF()
	+ " ");
	}
	} catch (UnsupportedEncodingException ex) {
	//This should have been made an enum type to avoid throwing exceptions.
	}
	}
	p.append("] \n");
	}


	// ENCODE
	if (function.getEncode() != null) {
	p.append("/Encode [ ");
	vectorSize = function.getEncode().size();
	for (tempInt = 0; tempInt < vectorSize; tempInt++) {
	p.append(PDFNumber.doubleOut(function.getEncode().get(tempInt))
	+ " ");
	}

	p.append("] \n");
	} else {
	p.append("/Encode [ ");
	vectorSize = function.getFunctions().size();
	for (tempInt = 0; tempInt < vectorSize; tempInt++) {
	p.append("0 1 ");
	}
	p.append("] \n");

	}


	// BOUNDS, required, but can be empty
	p.append("/Bounds [ ");
	if (function.getBounds() != null) {

	vectorSize = function.getBounds().size();
	for (tempInt = 0; tempInt < vectorSize; tempInt++) {
	p.append(PDFNumber.doubleOut(function.getBounds().get(tempInt))
	+ " ");
	}

	} else {
	if (function.getFunctions() != null) {
	// if there are n functions,
	// there must be n-1 bounds.
	// so let each function handle an equal portion
	// of the whole. e.g. if there are 4, then [ 0.25 0.25 0.25 ]

	String functionsFraction = PDFNumber.doubleOut(Double.valueOf(1.0
	/ (numberOfFunctions)));

	for (tempInt = 0; tempInt + 1 < numberOfFunctions;
	tempInt++) {

	p.append(functionsFraction + " ");
	}
	}

	}
	p.append("]\n>>");
	} else if (function.getFunctionType()
	== 4) { // fix this up when my eyes uncross
	// DOMAIN
	if (function.getDomain() != null) {
	p.append("/Domain [ ");
	vectorSize = function.getDomain().size();
	for (tempInt = 0; tempInt < vectorSize; tempInt++) {
	p.append(PDFNumber.doubleOut(function.getDomain().get(tempInt))
	+ " ");
	}

	p.append("] \n");
	} else {
	p.append("/Domain [ 0 1 ] \n");
	}

	// RANGE
	if (function.getRange() != null) {
	p.append("/Range [ ");
	vectorSize = function.getRange().size();
	for (tempInt = 0; tempInt < vectorSize; tempInt++) {
	p.append(PDFNumber.doubleOut(function.getRange().get(tempInt))
	+ " ");
	}

	p.append("] \n");
	}

	// LENGTH
	if (function.getDataStream() != null) {
	p.append("/Length " + (function.getDataStream().length() + 1)
	+ " \n");
	}

	p.append(">>");

	// stream representing the function
	if (function.getDataStream() != null) {
	p.append("\nstream\n{ " + function.getDataStream()
	+ " }\nendstream");
	}
	}
	return p.toString();
	}
	}