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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.svg;
import org.apache.batik.gvt.TextNode;
import org.apache.batik.bridge.SVGTextElementBridge;
import org.apache.batik.bridge.BridgeContext;
import org.apache.batik.gvt.GraphicsNode;
import org.apache.fop.fonts.FontInfo;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
/**
* Bridge class for the <text> element.
* This bridge will use the direct text painter if the text
* for the element is simple.
*
* @author <a href="mailto:keiron@aftexsw.com">Keiron Liddle</a>
*/
public class PDFTextElementBridge extends SVGTextElementBridge {
private PDFTextPainter pdfTextPainter;
/**
* Constructs a new bridge for the <text> element.
* @param fi the font infomration
*/
public PDFTextElementBridge(FontInfo fi) {
pdfTextPainter = new PDFTextPainter(fi);
}
/**
* Create a text element bridge.
* This set the text painter on the node if the text is simple.
* @param ctx the bridge context
* @param e the svg element
* @return the text graphics node created by the super class
*/
public GraphicsNode createGraphicsNode(BridgeContext ctx, Element e) {
GraphicsNode node = super.createGraphicsNode(ctx, e);
if (node != null && isSimple(ctx, e, node)) {
((TextNode)node).setTextPainter(getTextPainter());
}
return node;
}
private PDFTextPainter getTextPainter() {
return pdfTextPainter;
}
/**
* Check if text element contains simple text.
* This checks the children of the text element to determine
* if the text is simple. The text is simple if it can be rendered
* with basic text drawing algorithms. This means there are no
* alternate characters, the font is known and there are no effects
* applied to the text.
*
* @param ctx the bridge context
* @param element the svg text element
* @param node the graphics node
* @return true if this text is simple of false if it cannot be
* easily rendered using normal drawString on the PDFGraphics2D
*/
private boolean isSimple(BridgeContext ctx, Element element, GraphicsNode node) {
/* I cannot find any reference that 36pt is the maximum font size in PDF. Tests show
* no such restriction (jeremias, 28.5.2007)
*
// Font size, in user space units.
float fs = TextUtilities.convertFontSize(element).floatValue();
// PDF cannot display fonts over 36pt
if (fs > 36) {
return false;
}
*/
Element nodeElement;
for (Node n = element.getFirstChild();
n != null;
n = n.getNextSibling()) {
switch (n.getNodeType()) {
case Node.ELEMENT_NODE:
nodeElement = (Element)n;
if (n.getLocalName().equals(SVG_TSPAN_TAG)
|| n.getLocalName().equals(SVG_ALT_GLYPH_TAG)) {
return false;
} else if (n.getLocalName().equals(SVG_TEXT_PATH_TAG)) {
return false;
} else if (n.getLocalName().equals(SVG_TREF_TAG)) {
return false;
}
break;
case Node.TEXT_NODE:
case Node.CDATA_SECTION_NODE:
}
}
/*if (CSSUtilities.convertFilter(element, node, ctx) != null) {
return false;
}*/
return true;
}
}
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