Java tutorial
/* * 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: PDFImageHandlerSVG.java 1296526 2012-03-03 00:18:45Z gadams $ */ package org.apache.fop.render.pdf; import java.awt.Color; import java.awt.Rectangle; import java.awt.geom.AffineTransform; import java.io.IOException; import org.w3c.dom.Document; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.batik.bridge.BridgeContext; import org.apache.batik.bridge.GVTBuilder; import org.apache.batik.dom.svg.SVGDOMImplementation; import org.apache.batik.gvt.GraphicsNode; import org.apache.batik.util.SVGConstants; import org.apache.xmlgraphics.image.loader.Image; import org.apache.xmlgraphics.image.loader.ImageFlavor; import org.apache.xmlgraphics.image.loader.impl.ImageXMLDOM; import org.apache.xmlgraphics.util.UnitConv; import org.apache.fop.apps.FOUserAgent; import org.apache.fop.image.loader.batik.BatikImageFlavors; import org.apache.fop.image.loader.batik.BatikUtil; import org.apache.fop.render.ImageHandler; import org.apache.fop.render.ImageHandlerUtil; import org.apache.fop.render.RenderingContext; import org.apache.fop.render.pdf.PDFLogicalStructureHandler.MarkedContentInfo; import org.apache.fop.svg.PDFAElementBridge; import org.apache.fop.svg.PDFBridgeContext; import org.apache.fop.svg.PDFGraphics2D; import org.apache.fop.svg.SVGEventProducer; import org.apache.fop.svg.SVGUserAgent; /** * Image Handler implementation which handles SVG images. */ public class PDFImageHandlerSVG implements ImageHandler { /** logging instance */ private static Log log = LogFactory.getLog(PDFImageHandlerSVG.class); /** {@inheritDoc} */ public void handleImage(RenderingContext context, // CSOK: MethodLength Image image, Rectangle pos) throws IOException { PDFRenderingContext pdfContext = (PDFRenderingContext) context; PDFContentGenerator generator = pdfContext.getGenerator(); ImageXMLDOM imageSVG = (ImageXMLDOM) image; FOUserAgent userAgent = context.getUserAgent(); final float deviceResolution = userAgent.getTargetResolution(); if (log.isDebugEnabled()) { log.debug("Generating SVG at " + deviceResolution + "dpi."); } final float uaResolution = userAgent.getSourceResolution(); SVGUserAgent ua = new SVGUserAgent(userAgent, new AffineTransform()); GVTBuilder builder = new GVTBuilder(); //Controls whether text painted by Batik is generated using text or path operations boolean strokeText = false; //TODO connect with configuration elsewhere. BridgeContext ctx = new PDFBridgeContext(ua, (strokeText ? null : pdfContext.getFontInfo()), userAgent.getFactory().getImageManager(), userAgent.getImageSessionContext(), new AffineTransform()); //Cloning SVG DOM as Batik attaches non-thread-safe facilities (like the CSS engine) //to it. Document clonedDoc = BatikUtil.cloneSVGDocument(imageSVG.getDocument()); GraphicsNode root; try { root = builder.build(ctx, clonedDoc); builder = null; } catch (Exception e) { SVGEventProducer eventProducer = SVGEventProducer.Provider .get(context.getUserAgent().getEventBroadcaster()); eventProducer.svgNotBuilt(this, e, image.getInfo().getOriginalURI()); return; } // get the 'width' and 'height' attributes of the SVG document float w = image.getSize().getWidthMpt(); float h = image.getSize().getHeightMpt(); float sx = pos.width / w; float sy = pos.height / h; //Scaling and translation for the bounding box of the image AffineTransform scaling = new AffineTransform(sx, 0, 0, sy, pos.x / 1000f, pos.y / 1000f); double sourceScale = UnitConv.IN2PT / uaResolution; scaling.scale(sourceScale, sourceScale); //Scale for higher resolution on-the-fly images from Batik AffineTransform resolutionScaling = new AffineTransform(); double targetScale = uaResolution / deviceResolution; resolutionScaling.scale(targetScale, targetScale); resolutionScaling.scale(1.0 / sx, 1.0 / sy); //Transformation matrix that establishes the local coordinate system for the SVG graphic //in relation to the current coordinate system AffineTransform imageTransform = new AffineTransform(); imageTransform.concatenate(scaling); imageTransform.concatenate(resolutionScaling); if (log.isTraceEnabled()) { log.trace("nat size: " + w + "/" + h); log.trace("req size: " + pos.width + "/" + pos.height); log.trace("source res: " + uaResolution + ", targetRes: " + deviceResolution + " --> target scaling: " + targetScale); log.trace(image.getSize()); log.trace("sx: " + sx + ", sy: " + sy); log.trace("scaling: " + scaling); log.trace("resolution scaling: " + resolutionScaling); log.trace("image transform: " + resolutionScaling); } /* * Clip to the svg area. * Note: To have the svg overlay (under) a text area then use * an fo:block-container */ if (log.isTraceEnabled()) { generator.comment("SVG setup"); } generator.saveGraphicsState(); if (context.getUserAgent().isAccessibilityEnabled()) { MarkedContentInfo mci = pdfContext.getMarkedContentInfo(); generator.beginMarkedContentSequence(mci.tag, mci.mcid); } generator.updateColor(Color.black, false, null); generator.updateColor(Color.black, true, null); if (!scaling.isIdentity()) { if (log.isTraceEnabled()) { generator.comment("viewbox"); } generator.add(CTMHelper.toPDFString(scaling, false) + " cm\n"); } //SVGSVGElement svg = ((SVGDocument)doc).getRootElement(); PDFGraphics2D graphics = new PDFGraphics2D(true, pdfContext.getFontInfo(), generator.getDocument(), generator.getResourceContext(), pdfContext.getPage().referencePDF(), "", 0); graphics.setGraphicContext(new org.apache.xmlgraphics.java2d.GraphicContext()); if (!resolutionScaling.isIdentity()) { if (log.isTraceEnabled()) { generator.comment("resolution scaling for " + uaResolution + " -> " + deviceResolution); } generator.add(CTMHelper.toPDFString(resolutionScaling, false) + " cm\n"); graphics.scale(1.0 / resolutionScaling.getScaleX(), 1.0 / resolutionScaling.getScaleY()); } if (log.isTraceEnabled()) { generator.comment("SVG start"); } //Save state and update coordinate system for the SVG image generator.getState().save(); generator.getState().concatenate(imageTransform); //Now that we have the complete transformation matrix for the image, we can update the //transformation matrix for the AElementBridge. PDFAElementBridge aBridge = (PDFAElementBridge) ctx.getBridge(SVGDOMImplementation.SVG_NAMESPACE_URI, SVGConstants.SVG_A_TAG); aBridge.getCurrentTransform().setTransform(generator.getState().getTransform()); graphics.setPaintingState(generator.getState()); graphics.setOutputStream(generator.getOutputStream()); try { root.paint(graphics); ctx.dispose(); generator.add(graphics.getString()); } catch (Exception e) { SVGEventProducer eventProducer = SVGEventProducer.Provider .get(context.getUserAgent().getEventBroadcaster()); eventProducer.svgRenderingError(this, e, image.getInfo().getOriginalURI()); } generator.getState().restore(); if (context.getUserAgent().isAccessibilityEnabled()) { generator.restoreGraphicsStateAccess(); } else { generator.restoreGraphicsState(); } if (log.isTraceEnabled()) { generator.comment("SVG end"); } } /** {@inheritDoc} */ public int getPriority() { return 400; } /** {@inheritDoc} */ public Class getSupportedImageClass() { return ImageXMLDOM.class; } /** {@inheritDoc} */ public ImageFlavor[] getSupportedImageFlavors() { return new ImageFlavor[] { BatikImageFlavors.SVG_DOM }; } /** {@inheritDoc} */ public boolean isCompatible(RenderingContext targetContext, Image image) { boolean supported = (image == null || (image instanceof ImageXMLDOM && image.getFlavor().isCompatible(BatikImageFlavors.SVG_DOM))) && targetContext instanceof PDFRenderingContext; if (supported) { String mode = (String) targetContext.getHint(ImageHandlerUtil.CONVERSION_MODE); if (ImageHandlerUtil.isConversionModeBitmap(mode)) { //Disabling this image handler automatically causes a bitmap to be generated return false; } } return supported; } }