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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.
 
  */
 package org.apache.batik.svggen;
 
 
Utility class that converts a RescaleOp object into an SVG filter descriptor. The SVG filter corresponding to a RescaleOp is an feComponentTransfer, with a type set to 'linear', the slopes equal to the RescapeOp scaleFactors and the intercept equal to the RescapeOp offsets.

Author(s):
Vincent Hardy
Version:
$Id: SVGRescaleOp.java 476924 2006-11-19 21:13:26Z dvholten $
See also:
SVGBufferedImageOp
 
 public class SVGRescaleOp extends AbstractSVGFilterConverter {

    

Parameters:
generatorContext used to build Elements
 
     public SVGRescaleOp(SVGGeneratorContext generatorContext) {
         super(generatorContext);
     }

    
Converts a Java 2D API BufferedImageOp into a set of attribute/value pairs and related definitions

Parameters:
filter BufferedImageOp filter to be converted
filterRect Rectangle, in device space, that defines the area to which filtering applies. May be null, meaning that the area is undefined.
Returns:
descriptor of the attributes required to represent the input filter
See also:
SVGFilterDescriptor
 
     public SVGFilterDescriptor toSVG(BufferedImageOp filter,
                                      Rectangle filterRect) {
         if(filter instanceof RescaleOp)
             return toSVG((RescaleOp)filter);
         else
             return null;
     }

    

Parameters:
rescaleOp the RescaleOp to be converted
Returns:
a description of the SVG filter corresponding to rescaleOp. The definition of the feComponentTransfer filter in put in feComponentTransferDefSet
 
     public SVGFilterDescriptor toSVG(RescaleOp rescaleOp) {
         // Reuse definition if rescaleOp has already been converted
         SVGFilterDescriptor filterDesc =
             (SVGFilterDescriptor).get(rescaleOp);
 
         Document domFactory = .;
 
         if (filterDesc == null) {
             //
             // First time filter is converted: create its corresponding
             // SVG filter
             //
             Element filterDef = domFactory.createElementNS(,
                                                            );
             Element feComponentTransferDef =
                 domFactory.createElementNS(,
                                            );
 
             // Append transfer function for each component, setting
             // the attributes corresponding to the scale and offset.
             // Because we are using a RescaleOp as a BufferedImageOp,
             // the scaleFactors must be either:
             // + 1, in which case the same scale is applied to the
             //   Red, Green and Blue components,
             // + 3, in which case the scale factors apply to the
            //   Red, Green and Blue components
            // + 4, in which case the scale factors apply to the
            //   Red, Green, Blue and Alpha components
            float[] offsets = rescaleOp.getOffsets(null);
            float[] scaleFactors = rescaleOp.getScaleFactors(null);
            if(offsets.length != scaleFactors.length)
                throw new SVGGraphics2DRuntimeException();
            if(offsets.length != 1 &&
               offsets.length != 3 &&
               offsets.length != 4)
                throw new SVGGraphics2DRuntimeException();
            Element feFuncR = domFactory.createElementNS(,
                                                         );
            Element feFuncG = domFactory.createElementNS(,
                                                         );
            Element feFuncB = domFactory.createElementNS(,
                                                         );
            Element feFuncA = null;
            String type = ;
            if(offsets.length == 1){
                String slope = doubleString(scaleFactors[0]);
                String intercept = doubleString(offsets[0]);
                feFuncR.setAttributeNS(nulltype);
                feFuncG.setAttributeNS(nulltype);
                feFuncB.setAttributeNS(nulltype);
                feFuncR.setAttributeNS(nullslope);
                feFuncG.setAttributeNS(nullslope);
                feFuncB.setAttributeNS(nullslope);
                feFuncR.setAttributeNS(nullintercept);
                feFuncG.setAttributeNS(nullintercept);
                feFuncB.setAttributeNS(nullintercept);
            }
            else if(offsets.length >= 3){
                feFuncR.setAttributeNS(nulltype);
                feFuncG.setAttributeNS(nulltype);
                feFuncB.setAttributeNS(nulltype);
                feFuncR.setAttributeNS(null,
                                       doubleString(scaleFactors[0]));
                feFuncG.setAttributeNS(null,
                                       doubleString(scaleFactors[1]));
                feFuncB.setAttributeNS(null,
                                       doubleString(scaleFactors[2]));
                feFuncR.setAttributeNS(null,
                                       doubleString(offsets[0]));
                feFuncG.setAttributeNS(null,
                                       doubleString(offsets[1]));
                feFuncB.setAttributeNS(null,
                                       doubleString(offsets[2]));
                if(offsets.length == 4){
                    feFuncA = domFactory.createElementNS(,
                                                         );
                    feFuncA.setAttributeNS(nulltype);
                    feFuncA.setAttributeNS(null,
                                         doubleString(scaleFactors[3]));
                    feFuncA.setAttributeNS(null,
                                         doubleString(offsets[3]));
                }
            }
            feComponentTransferDef.appendChild(feFuncR);
            feComponentTransferDef.appendChild(feFuncG);
            feComponentTransferDef.appendChild(feFuncB);
            if(feFuncA != null)
                feComponentTransferDef.appendChild(feFuncA);
            filterDef.appendChild(feComponentTransferDef);
            filterDef.
                setAttributeNS(null,
                               ..
                               generateID());
            //
            // Create a filter descriptor
            //
            // Process filter attribute
//            StringBuffer filterAttrBuf = new StringBuffer(URL_PREFIX);
//            filterAttrBuf.append(SIGN_POUND);
//            filterAttrBuf.append(filterDef.getAttributeNS(null, SVG_ID_ATTRIBUTE));
//            filterAttrBuf.append(URL_SUFFIX);
            String filterAttrBuf =  +  + filterDef.getAttributeNS(null) + ;
            filterDesc = new SVGFilterDescriptor(filterAttrBuffilterDef);
            .add(filterDef);
            .put(rescaleOpfilterDesc);
        }
        return filterDesc;
    }
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