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/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2018 TIBCO Software Inc. All rights reserved.
* http://www.jaspersoft.com
*
* Unless you have purchased a commercial license agreement from Jaspersoft,
* the following license terms apply:
*
* This program is part of JasperReports.
*
* JasperReports is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* JasperReports is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with JasperReports. If not, see .
*/
package net.sf.jasperreports.renderers;
import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;
import net.sf.jasperreports.annotations.properties.Property;
import net.sf.jasperreports.annotations.properties.PropertyScope;
import net.sf.jasperreports.engine.JRPropertiesUtil;
import net.sf.jasperreports.engine.JasperReportsContext;
import net.sf.jasperreports.properties.PropertyConstants;
/**
* Provides functionality for image rendering.
*
* The content of an image element can come either directly from an image file like a JPG,
* GIF, PNG, or can be a Scalable Vector Graphics (SVG) file that is rendered using some
* business logic or a special graphics API like a charting or a barcode library. Either way,
* JasperReports treats images in a very transparent way because it relies on a special
* interface called {@link net.sf.jasperreports.renderers.Renderable} to offer a common
* way to render images.
*
* The {@link net.sf.jasperreports.renderers.Graphics2DRenderable} interface has a method called
* {@link Graphics2DRenderable#render(JasperReportsContext, Graphics2D, Rectangle2D)},
* which gets called by the engine each time it needs to draw the image
* on a given device or graphic context. This approach provides the best quality for the
* SVG images when they must be drawn on unknown devices or zoomed into without
* losing sharpness.
*
* The {@link net.sf.jasperreports.renderers.DataRenderable} interface has a method called
* {@link DataRenderable#getData(JasperReportsContext)},
* which gets called by the engine each time it needs the actual image data either to embed it
* directly into the exported documents, or to use it to draw the image or the graphic onto a device
* or graphic context.
*
* When a renderable object provides only binary data, the engine uses wrapping renderable implementations
* to add rendering functionality to the source renderable object. On the other hand, when the renderable object
* provides only direct rendering functionality, the engine wraps it into special renderable implementations that
* would allow producing image data out of the source rendering routines.
*
* The library comes with a default implementation for the
* {@link net.sf.jasperreports.renderers.DataRenderable} interface that
* wraps images that come from files or binary image data in JPG, GIF, or PNG format.
* This is the {@link net.sf.jasperreports.renderers.SimpleDataRenderer} class.
* For wrapping SVG data, the {@link net.sf.jasperreports.renderers.SimpleRenderToImageAwareDataRenderer} is better
* suited because it allows providing additional information about required resolution of the graphic, when converted to
* and image, as the engine needs to do that for certain document formats at export time.
*
* Image renderers are serializable because inside the generated document for each image is
* a renderer object kept as reference, which is serialized along with the whole
* JasperPrint object.
*
* When a {@link net.sf.jasperreports.renderers.SimpleDataRenderer} instance is serialized,
* so is the binary image data it contains.
*
* However, if the image element must be lazy loaded (see the isLazy image attribute), then the
* engine will not load the binary image data at report-filling time. Rather, it stores inside
* the renderer only the java.lang.String location of the image. The actual image data
* is loaded only when needed for rendering at report-export or view time.
* Lazy image renderers are represented by the the {@link ResourceRenderer} implementation and require
* the image data to be loaded at export time for certain export formats.
*
* @author Teodor Danciu ([email protected])
*/
public interface Renderable extends Serializable
{
/**
* Specifies the image resolution in dots-per-inch, for the images created by the engine when rasterizing SVGs or when clipping other renderers.
*/
@Property(
category = PropertyConstants.CATEGORY_OTHER,
defaultValue = "72",
scopes = {PropertyScope.CONTEXT},
sinceVersion = PropertyConstants.VERSION_4_1_1,
valueType = Integer.class
)
public static final String PROPERTY_IMAGE_DPI = JRPropertiesUtil.PROPERTY_PREFIX + "image.dpi";
/**
*
*/
public String getId();
}