Examples of java.awt.RenderingHints

java.awt.RenderingHints
The {@code RenderingHints} class defines and manages collections ofkeys and associated values which allow an application to provide input into the choice of algorithms used by other classes which perform rendering and image manipulation services. The {@link java.awt.Graphics2D} class, and classes that implement{@link java.awt.image.BufferedImageOp} and{@link java.awt.image.RasterOp} all provide methods to get andpossibly to set individual or groups of {@code RenderingHints}keys and their associated values. When those implementations perform any rendering or image manipulation operations they should examine the values of any {@code RenderingHints}that were requested by the caller and tailor the algorithms used accordingly and to the best of their ability.
Note that since these keys and values are hints, there is no requirement that a given implementation supports all possible choices indicated below or that it can respond to requests to modify its choice of algorithm. The values of the various hint keys may also interact such that while all variants of a given key are supported in one situation, the implementation may be more restricted when the values associated with other keys are modified. For example, some implementations may be able to provide several types of dithering when the antialiasing hint is turned off, but have little control over dithering when antialiasing is on. The full set of supported keys and hints may also vary by destination since runtimes may use different underlying modules to render to the screen, or to {@link java.awt.image.BufferedImage} objects,or while printing.
Implementations are free to ignore the hints completely, but should try to use an implementation algorithm that is as close as possible to the request. If an implementation supports a given algorithm when any value is used for an associated hint key, then minimally it must do so when the value for that key is the exact value that specifies the algorithm.
The keys used to control the hints are all special values that subclass the associated {@link RenderingHints.Key} class.Many common hints are expressed below as static constants in this class, but the list is not meant to be exhaustive. Other hints may be created by other packages by defining new objects which subclass the {@code Key} class and defining the associated values.

        // Unpack the RenderContext and set local variables based thereon
        AffineTransform usr2dev = renderContext.getTransform();
        if(usr2dev == null) {
            usr2dev = new AffineTransform();
        }
        RenderingHints hints = renderContext.getRenderingHints();
        Shape aoi = renderContext.getAreaOfInterest();
        if(aoi == null) {
            aoi = dimensions.getBounds();
        }

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    /**
     * Serialize the RenderingHintsState.
     */
    private void writeObject(ObjectOutputStream out) throws IOException {
        // -- Create a serializable form of the RenderingHints object. --
  RenderingHints hints = (RenderingHints)theObject;


        // Create an empty Hashtable.
        Hashtable table = new Hashtable();


        // If there are hints, add them to the table.
        if (hints != null && !hints.isEmpty()) {
            // Get a view of the hints' keys.
            Set keySet = hints.keySet();


            // Proceed if the key set is non-empty.
            if (!keySet.isEmpty()) {
                // Get an iterator for the key set.
                Iterator keyIterator = keySet.iterator();


                // Get the cached hint table.
                Hashtable hintTable = getHintTable();


                // Get the suppressed key Vector.
                Vector suppressedKeys = getSuppressedKeys();


                // Loop over the keys.
                while (keyIterator.hasNext()) {
                    // Get the next key.
                    Object key = keyIterator.next();


                    // Skip this element if the key is suppressed.
                    if (suppressedKeys != null &&
                        suppressedKeys.indexOf(key) != -1) {
                        continue;
                    }


                    // Get the field of the key.
                    Object keyElement = SerializerFactory.getState(key, null);


                    // If the key was not in the table it is not a public
                    // static field in one of the KEY_CLASSES so skip it.
                    if (keyElement == null) {
                        continue;
                    }


                    // Get the next value.
                    Object value = hints.get(key);


                    // Pack the key/value pair in a Hashtable entry.
                    HintElement valueElement = null;
                    try {
                        // Try to create a HintElement from the value directly.

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        throws IOException, ClassNotFoundException {
        // Read serialized form from the stream.
        Hashtable table = (Hashtable)in.readObject();


        // Create an empty RenderingHints object.
        RenderingHints hints = new RenderingHints(null);


  theObject = hints;


        // If the table is empty just return.
        if (table.isEmpty()) {
            return;
        }


        // -- Restore the transient RenderingHints object. --


        // Get an enumeration of the table keys.
        Enumeration keys = table.keys();


        // Loop over the table keys.
        while (keys.hasMoreElements()) {
            // Get the next key element.
            SerializableState keyElement = (SerializableState)keys.nextElement();


            // Get the key object corresponding to this key element.
            Object key = keyElement.getObject();


            // Get the value element.
            HintElement valueElement = (HintElement)table.get(keyElement);


            // Get the value object corresponding to this value element.
            Object value = valueElement.getObject();


            // Add an entry to the hints.
            hints.put(key, value);
        }
    }

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        throws IOException, ClassNotFoundException {
        // Read serialized form from the stream.
        Hashtable table = (Hashtable)in.readObject();


        // Create an empty RenderingHints object.
        hints = new RenderingHints(null);


        // If the table is empty just return.
        if(table.isEmpty()) {
            return;
        }

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    /**
     * Returns a clone of the <code>RenderingHints</code> of this node or
     * <code>null</code>.
     */
    public RenderingHints getRenderingHints() {
        RenderingHints hints = nodeSupport.getRenderingHints();
        return hints == null ? null : (RenderingHints)hints.clone();
    }

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        if ( key == null || value == null ) {
            throw new IllegalArgumentException(JaiI18N.getString("Generic0"));
        }


        RenderingHints rh = nodeSupport.getRenderingHints();
        if(rh == null) {
            nodeSupport.setRenderingHints(new RenderingHints(key, value));
        } else {
            rh.put(key, value);
            nodeSupport.setRenderingHints(rh);
        }
    }

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     *         <code>null</code> if the key is not mapped to any value.
     *
     * @since JAI 1.1
     */
    public synchronized Object getRenderingHint(RenderingHints.Key key) {
        RenderingHints rh = nodeSupport.getRenderingHints();
        return rh == null ? null : rh.get(key);
    }

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        // -- TiledImageGraphics state --
        // Cache the Hashtable of properties.
        properties = tiledImage.getProperties();


        // Create RenderingHints from the properties.
        renderingHints = new RenderingHints(properties);
    }

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     * @param paramBlock The parameters used to create the image.
     * @return A <code>RenderedImage</code>.
     */
    public RenderedImage create(RenderContext renderContext,
                                ParameterBlock paramBlock) {
        RenderingHints renderHints = renderContext.getRenderingHints();
        if (operationName != null) {
            OperationRegistry registry =
                renderHints == null ? null :
                (OperationRegistry)renderHints.get(JAI.KEY_OPERATION_REGISTRY);


            RenderedImage rendering;


            if(registry == null) {
                // Call the JAI.create method to get the best implementation

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        Map config;


        if (configuration == null) {


            config = new RenderingHints(JAI.KEY_REPLACE_INDEX_COLOR_MODEL,
                                        Boolean.FALSE);


        } else {


            config = configuration;


      // If the user has specified a hint for this, then we don't
      // want to change it, so change only if this hint is not 
      // already specified
            if (!(config.containsKey(JAI.KEY_REPLACE_INDEX_COLOR_MODEL))) {
                RenderingHints hints = (RenderingHints)configuration;
                config = (RenderingHints)hints.clone();
                config.put(JAI.KEY_REPLACE_INDEX_COLOR_MODEL, Boolean.FALSE);
            }
        }


        return config;

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