Package org.geotools.image.palette

Class CustomPaletteBuilder

Object
CustomPaletteBuilder
public final class CustomPaletteBuilder extends Object
This class implements the octree quantization method as it is described in the "Graphics Gems" (ISBN 0-12-286166-3, Chapter 4, pages 297-293)
Author:
Simone Giannecchini - GeoSolutions

  • Field Details

    • DEFAULT_ALPHA_TH

      public static final int DEFAULT_ALPHA_TH
      Default value for the threshold to decide whether a pixel is opaque (>=) or transparent (<). Default is 1 to try to preserve antialising
      See Also:

    • maxLevel

      protected int maxLevel
      maximum of tree depth

    • src

      protected RenderedImage src

    • srcColorModel

      protected ColorModel srcColorModel

    • requiredSize

      protected int requiredSize

    • root

      protected CustomPaletteBuilder.ColorNode root

    • numNodes

      protected int numNodes

    • maxNodes

      protected int maxNodes

    • currLevel

      protected int currLevel

    • currSize

      protected int currSize

    • reduceList

      protected CustomPaletteBuilder.ColorNode[] reduceList

    • palette

      protected CustomPaletteBuilder.ColorNode[] palette

    • transparency

      protected int transparency

    • transColor

      protected CustomPaletteBuilder.ColorNode transColor

    • subsampleX

      protected int subsampleX

    • subsampley

      protected int subsampley

    • numBands

      protected int numBands

    • alphaThreshold

      protected int alphaThreshold

  • Constructor Details

    • CustomPaletteBuilder

      public CustomPaletteBuilder(RenderedImage src)

    • CustomPaletteBuilder

      public CustomPaletteBuilder(RenderedImage src, int size, int subsx, int subsy, int alpha_th)

  • Method Details

    • canCreatePalette

      public static boolean canCreatePalette(ImageTypeSpecifier type)
      Returns true if PaletteBuilder is able to create palette for given image type.
      Parameters:
      type - an instance of ImageTypeSpecifier to be indexed.
      Returns:
      true if the PaletteBuilder is likely to be able to create palette for this image type.
      Throws:
      IllegalArgumentException - if type is null.

    • canCreatePalette

      public static boolean canCreatePalette(RenderedImage image)
      Returns true if PaletteBuilder is able to create palette for given rendered image.
      Parameters:
      image - an instance of RenderedImage to be indexed.
      Returns:
      true if the PaletteBuilder is likely to be able to create palette for this image type.
      Throws:
      IllegalArgumentException - if image is null.

    • getIndexedImage

      public RenderedImage getIndexedImage()

    • findColorIndex

      protected int findColorIndex(CustomPaletteBuilder.ColorNode aNode, int[] rgba, int transpBand)

    • buildPalette

      public CustomPaletteBuilder buildPalette()

    • insertNode

      protected CustomPaletteBuilder.ColorNode insertNode(CustomPaletteBuilder.ColorNode aNode, int[] rgba, int aLevel)

    • getIndexColorModel

      public IndexColorModel getIndexColorModel()

    • findPaletteEntry

      protected int findPaletteEntry(CustomPaletteBuilder.ColorNode aNode, int index, byte[] red, byte[] green, byte[] blue)

    • getBranchIndex

      protected int getBranchIndex(int[] rgba, int aLevel)

    • reduceTree

      protected void reduceTree()

    • freeTree

      protected CustomPaletteBuilder.ColorNode freeTree(CustomPaletteBuilder.ColorNode aNode)

    • findNearestColorIndex

      public int findNearestColorIndex(int[] rgba, int transparentBand)