Package org.apache.fop.util.bitmap

Class DitherUtil

java.lang.Object
org.apache.fop.util.bitmap.DitherUtil
public final class DitherUtil extends Object
Utility methods for dithering.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static final int
    DITHER_MATRIX_2X2
    Selects a 2x2 Bayer dither matrix (5 grayscales)
    static final int
    DITHER_MATRIX_4X4
    Selects a 4x4 Bayer dither matrix (17 grayscales)
    static final int
    DITHER_MATRIX_8X8
    Selects a 8x8 Bayer dither matrix (65 grayscales)

  • Method Summary

    Modifier and Type
    Method
    Description
    static int[]
    getBayerBasePattern(int matrix)
    Returns the Bayer dither base pattern for a particular matrix size.
    static byte[]
    getBayerDither(int matrix, int gray255, boolean doubleMatrix)
    Returns a byte array containing the dither pattern for the given 8-bit gray value.
    static byte[]
    getBayerDither(int matrix, Color col, boolean doubleMatrix)
    Returns a byte array containing the dither pattern for the given 8-bit gray value.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Field Details

    • DITHER_MATRIX_2X2

      public static final int DITHER_MATRIX_2X2
      Selects a 2x2 Bayer dither matrix (5 grayscales)
      See Also:

    • DITHER_MATRIX_4X4

      public static final int DITHER_MATRIX_4X4
      Selects a 4x4 Bayer dither matrix (17 grayscales)
      See Also:

    • DITHER_MATRIX_8X8

      public static final int DITHER_MATRIX_8X8
      Selects a 8x8 Bayer dither matrix (65 grayscales)
      See Also:

  • Method Details

    • getBayerBasePattern

      public static int[] getBayerBasePattern(int matrix)
      Returns the Bayer dither base pattern for a particular matrix size.
      Parameters:
      matrix - the matrix size (DITHER_MATRIX_2X2, DITHER_MATRIX_4X4 or DITHER_MATRIX_8X8)
      Returns:
      the base pattern for the given size

    • getBayerDither

      public static byte[] getBayerDither(int matrix, int gray255, boolean doubleMatrix)
      Returns a byte array containing the dither pattern for the given 8-bit gray value.
      Parameters:
      matrix - the matrix size (DITHER_MATRIX_2X2, DITHER_MATRIX_4X4 or DITHER_MATRIX_8X8)
      gray255 - the gray value (0-255)
      doubleMatrix - true if the 4x4 matrix shall be doubled to a 8x8
      Returns:
      the dither pattern

    • getBayerDither

      public static byte[] getBayerDither(int matrix, Color col, boolean doubleMatrix)
      Returns a byte array containing the dither pattern for the given 8-bit gray value.
      Parameters:
      matrix - the matrix size (DITHER_MATRIX_2X2, DITHER_MATRIX_4X4 or DITHER_MATRIX_8X8)
      col - the color
      doubleMatrix - true if the 4x4 matrix shall be doubled to a 8x8
      Returns:
      the dither pattern