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/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed 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.ps;
import java.awt.Color;
import java.io.IOException;
import org.apache.avalon.framework.configuration.Configuration;
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.fop.fonts.FontInfo;
import org.apache.fop.fonts.FontSetup;
import org.apache.fop.svg.AbstractFOPTranscoder;
import org.apache.xmlgraphics.java2d.ps.AbstractPSDocumentGraphics2D;
import org.apache.xmlgraphics.java2d.ps.TextHandler;
import org.w3c.dom.Document;
import org.w3c.dom.svg.SVGLength;
/**
* This class enables to transcode an input to a PostScript document.
*
* <p>Two transcoding hints (<tt>KEY_WIDTH</tt> and
* <tt>KEY_HEIGHT</tt>) 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 <tt>KEY_BACKGROUND_COLOR</tt> 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 <tt>KEY_AOI</tt> 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><tt>KEY_LANGUAGE</tt> to set the default language to use (may be
* used by a <switch> SVG element for example),
* <tt>KEY_USER_STYLESHEET_URI</tt> to fix the URI of a user
* stylesheet, and <tt>KEY_PIXEL_TO_MM</tt> to specify the pixel to
* millimeter conversion factor.
*
* @author <a href="mailto:keiron@aftexsw.com">Keiron Liddle</a>
* @version $Id$
*/
public abstract class AbstractPSTranscoder extends AbstractFOPTranscoder {
private Configuration cfg = null;
protected AbstractPSDocumentGraphics2D graphics = null;
/**
* Constructs a new <tt>AbstractPSTranscoder</tt>.
*/
public AbstractPSTranscoder() {
super();
}
protected abstract AbstractPSDocumentGraphics2D createDocumentGraphics2D();
/**
* 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()) {
FontInfo fontInfo = new FontInfo();
//TODO Do custom font configuration here somewhere/somehow
FontSetup.setup(fontInfo, null, null);
graphics.setCustomTextHandler(new NativeTextHandler(graphics, fontInfo));
}
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 {
graphics.setupDocument(output.getOutputStream(), 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);
}
}
/** @return true if text should be stroked rather than painted using text operators */
protected boolean isTextStroked() {
boolean stroke = false;
if (hints.containsKey(KEY_STROKE_TEXT)) {
stroke = ((Boolean)hints.get(KEY_STROKE_TEXT)).booleanValue();
}
return stroke;
}
/** @see org.apache.batik.transcoder.SVGAbstractTranscoder#createBridgeContext() */
protected BridgeContext createBridgeContext() {
BridgeContext ctx = new BridgeContext(userAgent);
if (!isTextStroked()) {
TextHandler handler = graphics.getCustomTextHandler();
if (handler instanceof NativeTextHandler) {
NativeTextHandler nativeTextHandler = (NativeTextHandler)handler;
PSTextPainter textPainter = new PSTextPainter(nativeTextHandler);
ctx.setTextPainter(textPainter);
ctx.putBridge(new PSTextElementBridge(textPainter));
}
}
//ctx.putBridge(new PSImageElementBridge());
return ctx;
}
}
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