Examples of org.apache.xmlgraphics.image.loader.ImageManager.preloadImage()

Package org.apache.xmlgraphics.image.loader

Class org.apache.xmlgraphics.image.loader.ImageManager

Examples of org.apache.xmlgraphics.image.loader.ImageManager.preloadImage()

org.apache.xmlgraphics.image.loader.ImageManager.preloadImage()
Preloads an image, i.e. the format of the image is identified and some basic information (MIME type, intrinsic size and possibly other values) are loaded and returned as an ImageInfo object. Note that the image is not fully loaded normally. Only with certain formats the image is already fully loaded and references added to the ImageInfo's custom objects (see {@link ImageInfo#getOriginalImage()}).
The reason for the preloading: Apache FOP, for example, only needs the image's intrinsic size during layout. Only when the document is rendered to the final format does FOP need to load the full image. Like this a lot of memory can be saved. @param uri the original URI of the image @param session the session context through which to resolve the URI @return the ImageInfo object created from the image @throws ImageException If no suitable ImagePreloader can be found to load the image orif an error occurred while preloading the image. @throws IOException If an I/O error occurs while preloading the image

            }


        });


        ImageManager manager = fopFactory.getImageManager();
        ImageInfo info = manager.preloadImage(uri, userAgent.getImageSessionContext());
        assertNotNull("ImageInfo must not be null", info);
        assertEquals(MimeConstants.MIME_SVG, info.getMimeType());
        assertEquals(uri, info.getOriginalURI());
        assertEquals(20, info.getSize().getWidthPx()); //100 = default viewport size
        assertEquals(20, info.getSize().getHeightPx());

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        String uri = "test/resources/images/testChart.wmf";


        FOUserAgent userAgent = fopFactory.newFOUserAgent();


        ImageManager manager = fopFactory.getImageManager();
        ImageInfo info = manager.preloadImage(uri, userAgent.getImageSessionContext());
        assertNotNull("ImageInfo must not be null", info);
        assertEquals(ImageWMF.MIME_WMF, info.getMimeType());
        assertEquals(uri, info.getOriginalURI());
        assertEquals(27940, info.getSize().getWidthPx());
        assertEquals(21590, info.getSize().getHeightPx());

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        String uri = "test/resources/images/img-w-size.svg";


        FOUserAgent userAgent = fopFactory.newFOUserAgent();


        ImageManager manager = fopFactory.getImageManager();
        ImageInfo info = manager.preloadImage(uri, userAgent.getImageSessionContext());
        assertNotNull("ImageInfo must not be null", info);


        Image img = manager.getImage(info, XMLNamespaceEnabledImageFlavor.SVG_DOM,
                userAgent.getImageSessionContext());
        assertNotNull("Image must not be null", img);

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        ff.setTargetResolution(300);


        FOUserAgent userAgent = ff.newFOUserAgent();


        ImageManager manager = ff.getImageManager();
        ImageInfo info = manager.preloadImage(uri, userAgent.getImageSessionContext());
        assertNotNull("ImageInfo must not be null", info);


        Image img = manager.getImage(info, XMLNamespaceEnabledImageFlavor.SVG_DOM,
                userAgent.getImageSessionContext());
        assertNotNull("Image must not be null", img);

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        String uri = "test/resources/images/testChart.wmf";


        FOUserAgent userAgent = fopFactory.newFOUserAgent();


        ImageManager manager = fopFactory.getImageManager();
        ImageInfo info = manager.preloadImage(uri, userAgent.getImageSessionContext());
        assertNotNull("ImageInfo must not be null", info);


        Image img = manager.getImage(info, ImageFlavor.RENDERED_IMAGE,
                userAgent.getImageSessionContext());
        assertNotNull("Image must not be null", img);

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        String uri = "test/resources/fop/svg/images.svg";
        FopFactory ff = FopFactory.newInstance();
        FOUserAgent userAgent = ff.newFOUserAgent();


        ImageManager manager = ff.getImageManager();
        ImageInfo info = manager.preloadImage(uri, userAgent.getImageSessionContext());
        assertNotNull("ImageInfo must not be null", info);


        Image img = manager.getImage(info, XMLNamespaceEnabledImageFlavor.SVG_DOM,
                userAgent.getImageSessionContext());
        assertNotNull("Image must not be null", img);

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     */
    protected void drawImageUsingDocument(Document doc, Rectangle rect) {
        ImageManager manager = getFopFactory().getImageManager();
        ImageInfo info = null;
        try {
            info = manager.preloadImage(null, new DOMSource(doc));


            drawImageUsingImageHandler(info, rect);
        } catch (ImageException ie) {
            ResourceEventProducer eventProducer = ResourceEventProducer.Provider.get(
                    getUserAgent().getEventBroadcaster());

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