/*
* 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: AbstractPSTranscoder.java 820689 2009-10-01 15:36:10Z jeremias $ */
package org.apache.fop.render.ps;
import java.awt.Color;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import org.w3c.dom.Document;
import org.w3c.dom.svg.SVGLength;
import org.apache.batik.bridge.BridgeContext;
import org.apache.batik.bridge.UnitProcessor;
import org.apache.batik.transcoder.TranscoderException;
import org.apache.batik.transcoder.TranscoderOutput;
import org.apache.batik.transcoder.image.ImageTranscoder;
import org.apache.xmlgraphics.java2d.ps.AbstractPSDocumentGraphics2D;
import org.apache.fop.apps.FOPException;
import org.apache.fop.fonts.FontInfo;
import org.apache.fop.svg.AbstractFOPTranscoder;
import org.apache.fop.svg.PDFDocumentGraphics2DConfigurator;
/**
* This class enables to transcode an input to a PostScript document.
*
* <p>Two transcoding hints (<code>KEY_WIDTH</code> and
* <code>KEY_HEIGHT</code>) can be used to respectively specify the image
* width and the image height. If only one of these keys is specified,
* the transcoder preserves the aspect ratio of the original image.
*
* <p>The <code>KEY_BACKGROUND_COLOR</code> defines the background color
* to use for opaque image formats, or the background color that may
* be used for image formats that support alpha channel.
*
* <p>The <code>KEY_AOI</code> represents the area of interest to paint
* in device space.
*
* <p>Three additional transcoding hints that act on the SVG
* processor can be specified:
*
* <p><code>KEY_LANGUAGE</code> to set the default language to use (may be
* used by a <switch> SVG element for example),
* <code>KEY_USER_STYLESHEET_URI</code> to fix the URI of a user
* stylesheet, and <code>KEY_PIXEL_TO_MM</code> to specify the pixel to
* millimeter conversion factor.
*
* @author <a href="mailto:keiron@aftexsw.com">Keiron Liddle</a>
* @version $Id: AbstractPSTranscoder.java 820689 2009-10-01 15:36:10Z jeremias $
*/
public abstract class AbstractPSTranscoder extends AbstractFOPTranscoder {
/** the root Graphics2D instance for generating PostScript */
protected AbstractPSDocumentGraphics2D graphics = null;
private FontInfo fontInfo;
/**
* Constructs a new {@link AbstractPSTranscoder}.
*/
public AbstractPSTranscoder() {
super();
}
/**
* Creates the root Graphics2D instance for generating PostScript.
* @return the root Graphics2D
*/
protected abstract AbstractPSDocumentGraphics2D createDocumentGraphics2D();
/** {@inheritDoc} */
protected boolean getAutoFontsDefault() {
//Currently set to false because auto-fonts requires a lot of memory in the PostScript
//case: All fonts (even the unsupported TTF fonts) need to be loaded and TrueType loading
//is currently very memory-intensive. At default JVM memory settings, this would result
//in OutOfMemoryErrors otherwise.
return false;
}
/**
* Transcodes the specified Document as an image in the specified output.
*
* @param document the document to transcode
* @param uri the uri of the document or null if any
* @param output the ouput where to transcode
* @exception TranscoderException if an error occured while transcoding
*/
protected void transcode(Document document, String uri,
TranscoderOutput output)
throws TranscoderException {
graphics = createDocumentGraphics2D();
if (!isTextStroked()) {
try {
this.fontInfo = PDFDocumentGraphics2DConfigurator.createFontInfo(
getEffectiveConfiguration());
graphics.setCustomTextHandler(new NativeTextHandler(graphics, fontInfo));
} catch (FOPException fe) {
throw new TranscoderException(fe);
}
}
super.transcode(document, uri, output);
getLogger().trace("document size: " + width + " x " + height);
// prepare the image to be painted
UnitProcessor.Context uctx = UnitProcessor.createContext(ctx,
document.getDocumentElement());
float widthInPt = UnitProcessor.userSpaceToSVG(width, SVGLength.SVG_LENGTHTYPE_PT,
UnitProcessor.HORIZONTAL_LENGTH, uctx);
int w = (int)(widthInPt + 0.5);
float heightInPt = UnitProcessor.userSpaceToSVG(height, SVGLength.SVG_LENGTHTYPE_PT,
UnitProcessor.HORIZONTAL_LENGTH, uctx);
int h = (int)(heightInPt + 0.5);
getLogger().trace("document size: " + w + "pt x " + h + "pt");
try {
OutputStream out = output.getOutputStream();
if (!(out instanceof BufferedOutputStream)) {
out = new BufferedOutputStream(out);
}
graphics.setupDocument(out, w, h);
graphics.setViewportDimension(width, height);
if (hints.containsKey(ImageTranscoder.KEY_BACKGROUND_COLOR)) {
graphics.setBackgroundColor
((Color)hints.get(ImageTranscoder.KEY_BACKGROUND_COLOR));
}
graphics.setGraphicContext
(new org.apache.xmlgraphics.java2d.GraphicContext());
graphics.setTransform(curTxf);
this.root.paint(graphics);
graphics.finish();
} catch (IOException ex) {
throw new TranscoderException(ex);
}
}
/** {@inheritDoc} */
protected BridgeContext createBridgeContext() {
//For compatibility with Batik 1.6
return createBridgeContext("1.x");
}
/** {@inheritDoc} */
public BridgeContext createBridgeContext(String version) {
BridgeContext ctx = new PSBridgeContext(userAgent, (isTextStroked() ? null : fontInfo),
getImageManager(), getImageSessionContext());
return ctx;
}
}