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.

    public void setNumRetries(int numRetries) {


  if (numRetries < 0)
      throw new IllegalArgumentException(JaiI18N.getString("Generic4"));


  RenderingHints rh = nodeSupport.getRenderingHints();
  if (rh == null) {
      RenderingHints hints = new RenderingHints(null);
      nodeSupport.setRenderingHints(hints);
  }


  nodeSupport.getRenderingHints().put(JAI.KEY_NUM_RETRIES,
              new Integer(numRetries));

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     * Returns the current negotiation preferences or null, if none were
     * set previously.
     */
    public NegotiableCapabilitySet getNegotiationPreferences() {


  RenderingHints rh = nodeSupport.getRenderingHints();


  NegotiableCapabilitySet ncs =
      rh == null ? null : (NegotiableCapabilitySet)rh.get(
               JAI.KEY_NEGOTIATION_PREFERENCES);
  return ncs;
    }

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     * process.
     */
    public void setNegotiationPreferences(NegotiableCapabilitySet preferences)
    {


  RenderingHints rh = nodeSupport.getRenderingHints();


  // If there are preferences to set
  if (preferences != null) {


      // Check whether RenderingHints exists, if not, create it.
      if (rh == null) {
    RenderingHints hints = new RenderingHints(null);
    nodeSupport.setRenderingHints(hints);
      }


      // Set the provided preferences into the RenderingHints
      nodeSupport.getRenderingHints().put(

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     * or <code>null</code>.
     *
     * @since JAI 1.1
     */
    public RenderingHints getRenderingHints() {
        RenderingHints hints = nodeSupport.getRenderingHints();
        return hints == null ? null : (RenderingHints)hints.clone();
    }

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     * @return The default RenderedImage.
     */
    public RenderedImage createDefaultRendering() {
        // Get the default dimensions.
        Dimension defaultDimension = null;
        RenderingHints hints = nodeSupport.getRenderingHints();
        if(hints != null &&
           hints.containsKey(JAI.KEY_DEFAULT_RENDERING_SIZE)) {
            defaultDimension =
                (Dimension)hints.get(JAI.KEY_DEFAULT_RENDERING_SIZE);
        }
        if(defaultDimension == null ||
           (defaultDimension.width <= 0 && defaultDimension.height <= 0)) {
            defaultDimension = JAI.getDefaultRenderingSize();
        }

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            // If there are any hints set on the node, create a new
            // RenderContext which merges them with those in the RenderContext
            // passed in with the passed in hints taking precedence.
            RenderContext rcIn = renderContext;
            RenderingHints nodeHints = nodeSupport.getRenderingHints();
            if(nodeHints != null) {
                RenderingHints hints = renderContext.getRenderingHints();
                RenderingHints mergedHints =
                    JAI.mergeRenderingHints(nodeHints, hints);
                if(mergedHints != hints) {
                    rcIn = new RenderContext(renderContext.getTransform(),
                                             renderContext.getAreaOfInterest(),
                                             mergedHints);

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    private static Map configHelper(Map configuration) {


  Map config;


  if (configuration == null) {
      config = new RenderingHints(JAI.KEY_REPLACE_INDEX_COLOR_MODEL,
          Boolean.FALSE);
  } else {


      config = configuration;


      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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     *              this mapping take precedence over any in
     *              <code>defaultHints</code>.
     */
    static RenderingHints mergeRenderingHints(RenderingHints defaultHints,
                                              RenderingHints hints) {
        RenderingHints mergedHints;
        if (hints == null || hints.isEmpty()) {
            mergedHints = defaultHints;
        } else if(defaultHints == null || defaultHints.isEmpty()) {
            mergedHints = hints;
        } else { // Both parameters are non-null and non-empty.
            mergedHints = new RenderingHints((Map)defaultHints);
            mergedHints.add(hints);
        }


        return mergedHints;
    }

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        if (!odesc.validateArguments(modeName, args, msg)) {
            throw new IllegalArgumentException(msg.toString());
        }


        // Merge rendering hints.  Hints passed in take precedence.
        RenderingHints mergedHints = mergeRenderingHints(renderingHints, hints);


        RenderedOp op = new RenderedOp(operationRegistry, opName,
                                       args, mergedHints);


        // If the operation requests immediate rendering, do so.

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    private static Map configHelper(Map configuration) {


  Map config;
  
  if (configuration == null) {
      config = new RenderingHints(JAI.KEY_REPLACE_INDEX_COLOR_MODEL, 
          Boolean.TRUE);
  } else {


      config = configuration;


      // If the user specified a value for this hint, we don't
      // want to change that
      if (!config.containsKey(JAI.KEY_REPLACE_INDEX_COLOR_MODEL)) {


    RenderingHints hints = new RenderingHints(null);
    // This is effectively a clone of configuration
    hints.putAll(configuration);
    config = hints;
    config.put(JAI.KEY_REPLACE_INDEX_COLOR_MODEL, Boolean.TRUE);
      }
  }

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