Examples of java.awt.image.renderable.ParameterBlock

java.awt.image.renderable.ParameterBlock
A ParameterBlock encapsulates all the information about sources and parameters (Objects) required by a RenderableImageOp, or other classes that process images.
Although it is possible to place arbitrary objects in the source Vector, users of this class may impose semantic constraints such as requiring all sources to be RenderedImages or RenderableImage. ParameterBlock itself is merely a container and performs no checking on source or parameter types.
All parameters in a ParameterBlock are objects; convenience add and set methods are available that take arguments of base type and construct the appropriate subclass of Number (such as Integer or Float). Corresponding get methods perform a downward cast and have return values of base type; an exception will be thrown if the stored values do not have the correct type. There is no way to distinguish between the results of "short s; add(s)" and "add(new Short(s))".
Note that the get and set methods operate on references. Therefore, one must be careful not to share references between ParameterBlocks when this is inappropriate. For example, to create a new ParameterBlock that is equal to an old one except for an added source, one might be tempted to write:
```
 ParameterBlock addSource(ParameterBlock pb, RenderableImage im) { ParameterBlock pb1 = new ParameterBlock(pb.getSources()); pb1.addSource(im); return pb1; } 
```
This code will have the side effect of altering the original ParameterBlock, since the getSources operation returned a reference to its source Vector. Both pb and pb1 share their source Vector, and a change in either is visible to both.
A correct way to write the addSource function is to clone the source Vector:
```
 ParameterBlock addSource (ParameterBlock pb, RenderableImage im) { ParameterBlock pb1 = new ParameterBlock(pb.getSources().clone()); pb1.addSource(im); return pb1; } 
```
The clone method of ParameterBlock has been defined to perform a clone of both the source and parameter Vectors for this reason. A standard, shallow clone is available as shallowClone.
The addSource, setSource, add, and set methods are defined to return 'this' after adding their argument. This allows use of syntax like:
```
 ParameterBlock pb = new ParameterBlock(); op = new RenderableImageOp("operation", pb.add(arg1).add(arg2)); 
```

        return mask;
    }


    private BufferedImage getGaussianBlur(int size, BufferedImage image) {
        KernelJAI kernel = Functions.getGaussKernel(size / 3.0);
        ParameterBlock pb = new ParameterBlock();
        pb.addSource(image);
        pb.add(kernel);
        RenderingHints hints = new RenderingHints(JAI.KEY_BORDER_EXTENDER,
                                                  BorderExtender.createInstance(BorderExtender.BORDER_COPY));
        hints.add(JAIContext.noCacheHint);
        return JAI.create("LCSeparableConvolve", pb, hints).getAsBufferedImage();
    }

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    static RenderedImage rotate(RenderedImage image, ImageMetadata meta) {
        if (meta != null) {
            ImageOrientation orient = meta.getOrientation();
            TransposeType transpose = orient.getCorrection();
            if (transpose != null) {
                ParameterBlock pb = new ParameterBlock();
                pb.addSource(image);
                pb.add(transpose);
                image = JAI.create(
                    "Transpose", pb, null
                );
            }
        }

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                break;
            default:
                transpose = null;
        }
        if (transpose != null) {
            ParameterBlock pb = new ParameterBlock();
            pb.addSource(image);
            pb.add(transpose);
            image = JAI.create(
                "Transpose", pb, null
            );
        }
        return image;

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            return PlanarImage.wrapRenderedImage(source);


        float scaleX = (float) Math.floor(scale * source.getWidth()) / (float) source.getWidth();
        float scaleY = (float) Math.floor(scale * source.getHeight()) / (float) source.getHeight();


        ParameterBlock params = new ParameterBlock();
        params.addSource(source);
        params.add(AffineTransform.getScaleInstance(scaleX, scaleY));
        params.add(interpolation);
        RenderingHints hints = new RenderingHints(JAI.KEY_BORDER_EXTENDER,
            BorderExtender.createInstance(BorderExtender.BORDER_COPY));
        return JAI.create("Affine", params, hints);
    }

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                    samples, colors
                );
                RenderingHints formatHints = new RenderingHints(
                    JAI.KEY_IMAGE_LAYOUT, layout
                );
                ParameterBlock pb = new ParameterBlock();
                pb.addSource(image);
                pb.add(image.getSampleModel().getDataType());
                image = JAI.create("Format", pb, formatHints);
            }
        }
        return image;
    }

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    // If an image has transparency, then add a bandselect to its pipeline.
    private static RenderedImage maybeBandSelect(RenderedImage image) {
        ColorModel colors = image.getColorModel();
        boolean hasAlpha = colors.hasAlpha();
        if (hasAlpha) {
            ParameterBlock pb = new ParameterBlock();
            pb.addSource(image);
            if (image.getColorModel().getNumColorComponents() == 3) {
                pb.add(new int[] {0, 1, 2});
            }
            else {
                pb.add(new int[] {0});
            }
            image = JAI.create("bandselect", pb, null);
        }
        return image;
    }

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        if(opNode instanceof RenderedOp &&
           name.equalsIgnoreCase("roi")) {
            RenderedOp op = (RenderedOp)opNode;


            ParameterBlock pb = op.getParameterBlock();


            // Retrieve the rendered source image and its ROI.
            PlanarImage src = (PlanarImage)pb.getRenderedSource(0);
            Object property = src.getProperty("ROI");
            if (property == null ||
                property.equals(java.awt.Image.UndefinedProperty) ||
                !(property instanceof ROI)) {
                return java.awt.Image.UndefinedProperty;
            }


            // Return undefined also if source ROI is empty.
            ROI srcROI = (ROI)property;
            if (srcROI.getBounds().isEmpty()) {
                return java.awt.Image.UndefinedProperty;
            }


            /// This should really create a proper AffineTransform
            /// and transform the ROI with it to avoid forcing
            /// ROI.getAsImage to be called.


            // Retrieve the transpose type and create a nearest neighbor
            // Interpolation object.
            TransposeType transposeType =
                (TransposeType)pb.getObjectParameter(0);
            Interpolation interp =
                Interpolation.getInstance(Interpolation.INTERP_NEAREST);


            // Return the transposed ROI.
            return new ROI(JAI.create("transpose", srcROI.getAsImage(),

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            // which satisfies the description in P. J. Burt and
            // E. H. Adelson, "The Laplacian pyramid as a compact image code", 
            // IEEE Transactions on Communications., pp. 532-540, 1983. 


            // Add the filtering operation.
            ParameterBlock pb = new ParameterBlock();
            KernelJAI kernel = new KernelJAI(DEFAULT_KERNEL_1D.length,
                                             DEFAULT_KERNEL_1D.length,
                                             DEFAULT_KERNEL_1D.length/2,
                                             DEFAULT_KERNEL_1D.length/2,
                                             DEFAULT_KERNEL_1D,
                                             DEFAULT_KERNEL_1D);
            pb.add(kernel);
            BorderExtender extender =
                BorderExtender.createInstance(BorderExtender.BORDER_COPY);
            RenderingHints hints =
                JAI.getDefaultInstance().getRenderingHints();
            if(hints == null) {
                hints = new RenderingHints(JAI.KEY_BORDER_EXTENDER, extender);
            } else {
                hints.put(JAI.KEY_BORDER_EXTENDER, extender);
            }
                                   
            RenderedOp filter = new RenderedOp("convolve", pb, hints);


            // Add the subsampling operation.
            pb = new ParameterBlock();
            pb.addSource(filter);
            pb.add(new Float(0.5F)).add(new Float(0.5F));
            pb.add(new Float(0.0F)).add(new Float(0.0F));
            pb.add(Interpolation.getInstance(Interpolation.INTERP_NEAREST));
            RenderedOp downSampler = new RenderedOp("scale", pb, null);
            args.set(downSampler, 0);
        }


        // Verify the generic integrity of the arguments and set defaults.

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  if (op == null)
      throw new IllegalArgumentException(JaiI18N.getString("Generic0"));


        // Get the source Vector from the ParameterBlock.
        ParameterBlock pb = op.getParameterBlock();
  Vector pv = (pb == null) ? null : pb.getSources();


        // If the source Vector is null, replace it by a zero-length
        // Vector. This tricks the DescriptorCache into accepting the
        // parameter and the PropertyEnvironment object created in
        // the DescriptorCache works with either a null or zero-length

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        if(opNode instanceof RenderedOp &&
           name.equalsIgnoreCase("roi")) {
            RenderedOp op = (RenderedOp)opNode;


            ParameterBlock pb = op.getParameterBlock();


            // Retrieve the rendered source image and its ROI.
            RenderedImage src = (RenderedImage)pb.getRenderedSource(0);
            Object property = src.getProperty("ROI");
            if (property == null ||
                property.equals(java.awt.Image.UndefinedProperty) ||
                !(property instanceof ROI)) {
                return java.awt.Image.UndefinedProperty;
            }
            ROI srcROI = (ROI)property;


            // Retrieve the Interpolation object.
            Interpolation interp = (Interpolation)pb.getObjectParameter(4);


            // Determine the effective source bounds.
            Rectangle srcBounds = null;
            PlanarImage dst = op.getRendering();
            if (dst instanceof GeometricOpImage &&
                ((GeometricOpImage)dst).getBorderExtender() == null) {
                srcBounds =
                    new Rectangle(src.getMinX() + interp.getLeftPadding(),
                                  src.getMinY() + interp.getTopPadding(),
                                  src.getWidth() - interp.getWidth() + 1,
                                  src.getHeight() - interp.getHeight() + 1);
            } else {
                srcBounds = new Rectangle(src.getMinX(),
            src.getMinY(),
            src.getWidth(),
            src.getHeight());
            }


            // Set the nearest neighbor interpolation object.
            Interpolation interpNN = interp instanceof InterpolationNearest ?
                interp :
                Interpolation.getInstance(Interpolation.INTERP_NEAREST);


            // Retrieve the operation parameters.
            float sv = pb.getFloatParameter(0);
            EnumeratedParameter shearDir =
                (EnumeratedParameter)pb.getObjectParameter(1);
            float tx = pb.getFloatParameter(2);
            float ty = pb.getFloatParameter(3);


            // Create an equivalent transform.
            AffineTransform transform =
                new AffineTransform(1.0,
                                    shearDir == ShearDescriptor.SHEAR_VERTICAL ? sv : 0,

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