fop 1.0

org.apache.fop.util.bitmap
Class DitherUtil

java.lang.Object
  extended by org.apache.fop.util.bitmap.DitherUtil

public class DitherUtil
extends java.lang.Object

Utility methods for dithering.


Field Summary
static int DITHER_MATRIX_2X2
          Selects a 2x2 Bayer dither matrix (5 grayscales)
static int DITHER_MATRIX_4X4
          Selects a 4x4 Bayer dither matrix (17 grayscales)
static int DITHER_MATRIX_8X8
          Selects a 8x8 Bayer dither matrix (65 grayscales)
 
Constructor Summary
DitherUtil()
           
 
Method Summary
static int[] getBayerBasePattern(int matrix)
          Returns the Bayer dither base pattern for a particular matrix size.
static byte[] getBayerDither(int matrix, java.awt.Color col, boolean doubleMatrix)
          Returns a byte array containing the dither pattern for the given 8-bit gray value.
static byte[] getBayerDither(int matrix, int gray255, 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 Detail

DITHER_MATRIX_2X2

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

See Also:
Constant Field Values

DITHER_MATRIX_4X4

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

See Also:
Constant Field Values

DITHER_MATRIX_8X8

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

See Also:
Constant Field Values
Constructor Detail

DitherUtil

public DitherUtil()
Method Detail

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,
                                    java.awt.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

fop 1.0

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