/*
* 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: PSImageUtils.java 746664 2009-02-22 12:40:44Z jeremias $ */
package org.apache.fop.render.ps;
import java.awt.Rectangle;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import org.apache.xmlgraphics.image.loader.ImageFlavor;
import org.apache.xmlgraphics.image.loader.ImageInfo;
import org.apache.xmlgraphics.image.loader.ImageManager;
import org.apache.xmlgraphics.image.loader.pipeline.ImageProviderPipeline;
import org.apache.xmlgraphics.ps.DSCConstants;
import org.apache.xmlgraphics.ps.PSGenerator;
import org.apache.xmlgraphics.ps.PSResource;
import org.apache.fop.render.ImageHandlerRegistry;
import org.apache.fop.render.RenderingContext;
/**
* Utility code for rendering images in PostScript.
*/
public class PSImageUtils extends org.apache.xmlgraphics.ps.PSImageUtils {
/**
* Indicates whether the given image (identified by an {@link ImageInfo} object) shall be
* inlined rather than generated as a PostScript form.
* @param info the info object for the image
* @param renderingContext the rendering context
* @return true if the image shall be inlined, false if forms shall be used.
*/
public static boolean isImageInlined(ImageInfo info, PSRenderingContext renderingContext) {
String uri = info.getOriginalURI();
if (uri == null || "".equals(uri)) {
return true;
}
//Investigate choice for inline mode
ImageFlavor[] inlineFlavors = determineSupportedImageFlavors(renderingContext);
ImageManager manager = renderingContext.getUserAgent().getFactory().getImageManager();
ImageProviderPipeline[] inlineCandidates
= manager.getPipelineFactory().determineCandidatePipelines(
info, inlineFlavors);
ImageProviderPipeline inlineChoice = manager.choosePipeline(inlineCandidates);
ImageFlavor inlineFlavor = (inlineChoice != null
? inlineChoice.getTargetFlavor() : null);
//Create a rendering context for form creation
PSRenderingContext formContext = renderingContext.toFormContext();
//Investigate choice for form mode
ImageFlavor[] formFlavors = determineSupportedImageFlavors(formContext);
ImageProviderPipeline[] formCandidates
= manager.getPipelineFactory().determineCandidatePipelines(
info, formFlavors);
ImageProviderPipeline formChoice = manager.choosePipeline(formCandidates);
ImageFlavor formFlavor = (formChoice != null ? formChoice.getTargetFlavor() : null);
//Inline if form is not supported or if a better choice is available with inline mode
return formFlavor == null || !formFlavor.equals(inlineFlavor);
}
private static ImageFlavor[] determineSupportedImageFlavors(RenderingContext renderingContext) {
ImageFlavor[] inlineFlavors;
ImageHandlerRegistry imageHandlerRegistry
= renderingContext.getUserAgent().getFactory().getImageHandlerRegistry();
inlineFlavors = imageHandlerRegistry.getSupportedFlavors(renderingContext);
return inlineFlavors;
}
/**
* Draws a form at a given location.
* @param form the form resource
* @param info the image info object representing the image in the form
* @param rect the target rectangle (coordinates in millipoints)
* @param generator the PostScript generator
* @throws IOException if an I/O error occurs
*/
public static void drawForm(PSResource form, ImageInfo info, Rectangle rect,
PSGenerator generator) throws IOException {
Rectangle2D targetRect = new Rectangle2D.Double(
rect.getMinX() / 1000.0,
rect.getMinY() / 1000.0,
rect.getWidth() / 1000.0,
rect.getHeight() / 1000.0);
generator.saveGraphicsState();
translateAndScale(generator,
info.getSize().getDimensionPt(), targetRect);
//The following %%IncludeResource marker is needed later by ResourceHandler!
generator.writeDSCComment(DSCConstants.INCLUDE_RESOURCE, form);
generator.getResourceTracker().notifyResourceUsageOnPage(form);
generator.writeln(form.getName() + " execform");
generator.restoreGraphicsState();
}
}