Examples of org.geotools.resources.image.ComponentColorModelJAI

org.geotools.resources.image.ComponentColorModelJAI
A {@link ComponentColorModel} modified for interoperability with Java Advanced Imaging.JAI 1.1 was designed for use with J2SE 1.3 and is not aware of new features in J2SE 1.4. This leads to the following problems:
- {@link ComponentColorModel} supports {@code float} and {@code double}datatypes since J2SE 1.4 only. The workaround for J2SE 1.3 is to use the {@link FloatDoubleColorModel} provided with JAI 1.1.
- {@link FloatDoubleColorModel} ignores the new API in {@link ColorSpace}, especially the {@code getMinValue} and {@code getMaxValue} methods. Consequently,rendering of any image using our custom {@code ScaledColorSpace} is wrong.
- {@link ComponentColorModel} uses {@link java.awt.image.DataBufferFloat} and {@link java.awt.image.DataBufferDouble}, which are unknown to JAI 1.1. Consequently, trying to use {@link RectIter} with one of those will throw {@link ClassCastException}.
The work around is to use J2SE's {@link ComponentColorModel} (which work with our custom{@link ColorSpace}) and override its {@code createCompatibleSampleModel} in order toreturns {@link ComponentSampleModelJAI} instead of {@link ComponentSampleModel} when{@code float} or {@code double} datatype is requested. @todo Remove this patch when JAI will recognize J2SE 1.4 classes. @since 2.0 @source $URL$ @version $Id$ @author Martin Desruisseaux (IRD)

                colorSpace = new BogusColorSpace(numberOfBands);
                int[] numBits = new int[numberOfBands];
                for (int i = 0; i < numberOfBands; i++) {
                    numBits[i] = bitsPerSample;
                }
                colorModel = new ComponentColorModelJAI(colorSpace, numBits, false, false,
                        Transparency.OPAQUE, dataType);
            }
            {
                int[] bankIndices = new int[numberOfBands];
                int[] bandOffsets = new int[numberOfBands];

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        boolean isAlphaPremultiplied = false;
        int transparency = Transparency.TRANSLUCENT;
        int transferType = dataType;


        int[] nBits = { 8, 8, 8, 8 };
        ColorModel colorModel = new ComponentColorModelJAI(colorSpace, nBits, hasAlpha,
                isAlphaPremultiplied, transparency, transferType);


        /*
         * Do not use colorModel.createCompatibleSampleModel cause it creates a
         * PixelInterleavedSampleModel and we need a BandedSampleModel so it matches how the data

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        boolean hasAlpha = false;
        boolean isAlphaPremultiplied = false;
        int transparency = Transparency.OPAQUE;
        int transferType = dataType;
        int[] nbits = { bitsPerPixel };
        ColorModel colorModel = new ComponentColorModelJAI(colorSpace, nbits, hasAlpha,
                isAlphaPremultiplied, transparency, transferType);


        SampleModel sampleModel = colorModel.createCompatibleSampleModel(sampleImageWidth,
                sampleImageHeight);
        its = new ImageTypeSpecifier(colorModel, sampleModel);
        return its;
    }

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          raster.setSample(x, y, 0, noDataValue);
        else
          raster.setSample(x, y, 0, (x + y));
      }
    }
    final ColorModel cm = new ComponentColorModelJAI(ColorSpace
        .getInstance(ColorSpace.CS_GRAY), false, false,
        Transparency.OPAQUE, DataBuffer.TYPE_DOUBLE);
    final BufferedImage image = new BufferedImage(cm, raster, false, null);
    return image;
  }

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    for (int y = 0; y < height; y++) {
      for (int x = 0; x < width; x++) {
        raster.setSample(x, y, 0, (x + y));
      }
    }
    final ColorModel cm = new ComponentColorModelJAI(ColorSpace
        .getInstance(ColorSpace.CS_GRAY), false, false,
        Transparency.OPAQUE, DataBuffer.TYPE_DOUBLE);
    final BufferedImage image = new BufferedImage(cm, raster, false, null);
    return image;
  }

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    for (int y = 0; y < height; y++) {
      for (int x = 0; x < width; x++) {
        raster.setSample(x, y, 0, (x + y));
      }
    }
    final ColorModel cm = new ComponentColorModelJAI(ColorSpace
        .getInstance(ColorSpace.CS_GRAY), false, false,
        Transparency.OPAQUE, DataBuffer.TYPE_FLOAT);
    final BufferedImage image = new BufferedImage(cm, raster, false, null);
    return image;
  }

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            }
            if (false) {
                // Our patched color model extends J2SE's ComponentColorModel (which work correctly
                // with our custom ColorSpace), but create JAI's SampleModel instead of J2SE's one.
                // It make RectIter happy and display colors correctly.
                return new ComponentColorModelJAI(colors, false, false, transparency, type);
            }
            // This factory is not really different from a direct construction of
            // FloatDoubleColorModel. We provide it here just because we must end
            // with something.
            return RasterFactory.createComponentColorModel(type, colors, false, false, transparency);

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    for (int y = 0; y < height; y++) {
      for (int x = 0; x < width; x++) {
        raster.setSample(x, y, 0,Math.ceil(random.nextDouble()*maximum) );
      }
    }
    final ColorModel cm = new ComponentColorModelJAI(ColorSpace
        .getInstance(ColorSpace.CS_GRAY), false, false,
        Transparency.OPAQUE, DataBuffer.TYPE_DOUBLE);
    final BufferedImage image = new BufferedImage(cm, raster, false, null);
    return image;
  }

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