Examples of javax.media.jai.ImageLayout

javax.media.jai.ImageLayout
A class describing the desired layout of an OpImage.
The ImageLayout class encapsulates three types of information about an image:
- The image bounds, comprising the min X and Y coordinates, image width, and image height;
- The tile grid layout, comprising the tile grid X and Y offsets, the tile width, and the tile height; and
- The SampleModel and ColorModel of the image.
Each of these parameters may be set individually, or left unset. An unset parameter will cause the corresponding value of a given RenderedImage to be used. For example, the code:
```
 ImageLayout layout; RenderedImage im; int width = layout.getTileWidth(im); 
```
will return the tile width of the ImageLayout if it is set, or the tile width of the image im if it is not.
ImageLayout objects are primarily intended to be passed as part of the renderingHints argument of the create() method of RenderedImageFactory. The create() method may remove parameter settings that it cannot deal with, prior to passing the ImageLayout to any OpImage constructors. New OpImage subclasses are not required to accept an ImageLayout parameter, but most will at least need to synthesize one to be passed up the constructor chain.
Methods that modify the state of an ImageLayout return a reference to 'this' following the change. This allows multiple modifications to be made in a single expression. This provides a way of modifying an ImageLayout within a superclass constructor call.

            }
          }
        }


        if (images.size() > 0) {
          ImageLayout imageLayout = new ImageLayout(0, 0, (int) pixelBounds.getWidth(),
              (int) pixelBounds.getHeight());
          imageLayout.setTileWidth(tileWidth);
          imageLayout.setTileHeight(tileHeight);


          // create the mosaic image
          ParameterBlock pbMosaic = new ParameterBlock();
          pbMosaic.add(MosaicDescriptor.MOSAIC_TYPE_OVERLAY);
          for (RenderedImage renderedImage : images) {

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     * @return
     */
    private RenderedImage optimizeSampleModel(RenderedImage source) {
        int w = source.getWidth();
        int h = source.getHeight();
        ImageLayout layout = new ImageLayout();
        layout.setColorModel(source.getColorModel());
        layout.setSampleModel(source.getColorModel().createCompatibleSampleModel(w, h));
        // if I don't force tiling off with this setting an exception is thrown
        // when writing the image out...
        layout.setTileWidth(w);
        layout.setTileHeight(h);
        RenderingHints hints = new RenderingHints(JAI.KEY_IMAGE_LAYOUT, layout);
        return LookupDescriptor.create(source, IDENTITY_TABLE, hints);
    }

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                // bitmask
                dstColorModel = new IndexColorModel(
                    bitsPerPixel, maxNumEntries, reds, greens, blues, alphas);
            }


            ImageLayout il = new ImageLayout();
            il.setColorModel(dstColorModel);
            RenderingHints rh = new RenderingHints(JAI.KEY_IMAGE_LAYOUT, il);


            // reformat this image to use the new ColorModel (and its new color map)
            ParameterBlock formatPB = new ParameterBlock();
            formatPB.addSource(src);

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            -1,
            oldModel.getTransferType());


        // Create an image layout from the input image (this makes the
        // layout have the same values as the imput image).
        ImageLayout layout = new ImageLayout(src);
        // Set the color model of the ImageLayout to the new ColorModel
        // without the alpha/transparency included
        layout.setColorModel(newModel);
        // Create renderinghints to tell the format operation what to do
        // i.e. use the image layout created above and use it during
        // the formatting operation.
        RenderingHints hints = new RenderingHints(JAI.KEY_IMAGE_LAYOUT,
                                                  layout);

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        int bitSize = numBitsToIndexColourmap(colorMapSize);


        KernelJAI kernel = getKernelFor(params, bitSize);
        IndexColorModel cm = getIndexColorModel(src, colorMapSize);
        ImageLayout layout = new ImageLayout();
        layout.setColorModel(cm);
        RenderingHints hints = new RenderingHints(JAI.KEY_IMAGE_LAYOUT, layout);
        if (src.getColorModel().getTransparency() != Transparency.OPAQUE &&
            (!(src.getColorModel() instanceof IndexColorModel))) {


           // RenderedOp alpha = ImageUtils.extractAlphaChannel(src);

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        // format of the image. This has caused numerous problems.
        // Therefore the brute force aprroach is here taken to change the
        // in-memory format of the image to a type that we know the
        // operator likes. This is not fool proof. It converts all images
        // into non-indexed representations that have a byte pixel width
        ImageLayout layout = new ImageLayout();
        layout.setSampleModel(
            new BandedSampleModel(DataBuffer.TYPE_BYTE,
                                  src.getWidth(),
                                  src.getHeight(),
                                  src.getColorModel().getNumColorComponents()));
        // set up the rendering hints object that is passed to the format

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                // transparency.
                converted = ImageUtils.applyAlphaChannel(converted, 0);


                // now we coerce the data into a format that the BMP writer
                // seems happy with.
                ImageLayout layout = new ImageLayout();
                SampleModel sampleModel =
                    RasterFactory.createComponentSampleModel(
                        converted.getSampleModel(),
                        converted.getSampleModel().getDataType(),
                        converted.getWidth(),
                        converted.getHeight(),
                        3);
                layout.setSampleModel(sampleModel);
                RenderingHints hints = new RenderingHints(
                    JAI.KEY_IMAGE_LAYOUT, layout);
                converted = FormatDescriptor.create(
                    converted,
                        converted.getSampleModel().getDataType(),

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                                    -1,
                                    oldModel.getTransferType());


            // Create an image layout from the input image (this makes the
            // layout have the same values as the imput image).
            ImageLayout layout = new ImageLayout(input);
            // Set the color model of the ImageLayout to the new ColorModel
            // without the alpha/transparency included.
            layout.setColorModel(newModel);
            // Create renderinghints to tell the format operation what to do
            // i.e. use the image layout created above and use it during
            // the formatting operation.
            RenderingHints rHint = new RenderingHints(JAI.KEY_IMAGE_LAYOUT,
                                                      layout);

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            pb.add(colorMap);
            pb.add(KernelJAI.DITHER_MASK_441);
        }
        
        //Create an image layout for a monochrome b/w image
        ImageLayout layout = new ImageLayout();
        byte[] map = new byte[] {(byte)0x00, (byte)0xff};
        ColorModel cm = new IndexColorModel(1, 2, map, map, map);
        layout.setColorModel(cm);


        // Create a hint containing the layout.
        RenderingHints hints = new RenderingHints(JAI.KEY_IMAGE_LAYOUT, layout);


        // Dither the image.

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            pb.add(colorMap);
            pb.add(KernelJAI.DITHER_MASK_441);
        }
        
        //Create an image layout for a monochrome b/w image
        ImageLayout layout = new ImageLayout();
        byte[] map = new byte[] {(byte)0x00, (byte)0xff};
        ColorModel cm = new IndexColorModel(1, 2, map, map, map);
        layout.setColorModel(cm);


        // Create a hint containing the layout.
        RenderingHints hints = new RenderingHints(JAI.KEY_IMAGE_LAYOUT, layout);


        // Dither the image.

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