/* * 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; } }