Package org.apache.fop.util.bitmap
Class DitherUtil
java.lang.Object
org.apache.fop.util.bitmap.DitherUtil
Utility methods for dithering.
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Field Summary
FieldsModifier and TypeFieldDescriptionprivate static final int[]
private static final int[]
private static final int[]
static final int
Selects a 2x2 Bayer dither matrix (5 grayscales)static final int
Selects a 4x4 Bayer dither matrix (17 grayscales)static final int
Selects a 8x8 Bayer dither matrix (65 grayscales) -
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionprivate static int[]
deriveBayerMatrix
(int[] d) 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.private static void
setValueInMatrix
(int[] dn, int half, int part, int idx, int value)
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Field Details
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DITHER_MATRIX_2X2
public static final int DITHER_MATRIX_2X2Selects a 2x2 Bayer dither matrix (5 grayscales)- See Also:
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DITHER_MATRIX_4X4
public static final int DITHER_MATRIX_4X4Selects a 4x4 Bayer dither matrix (17 grayscales)- See Also:
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DITHER_MATRIX_8X8
public static final int DITHER_MATRIX_8X8Selects a 8x8 Bayer dither matrix (65 grayscales)- See Also:
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BAYER_D2
private static final int[] BAYER_D2 -
BAYER_D4
private static final int[] BAYER_D4 -
BAYER_D8
private static final int[] BAYER_D8
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Constructor Details
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DitherUtil
private DitherUtil()
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Method Details
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deriveBayerMatrix
private static int[] deriveBayerMatrix(int[] d) -
setValueInMatrix
private static void setValueInMatrix(int[] dn, int half, int part, int idx, int value) -
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
orDITHER_MATRIX_8X8
)- Returns:
- the base pattern for the given size
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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
orDITHER_MATRIX_8X8
)gray255
- the gray value (0-255)doubleMatrix
- true if the 4x4 matrix shall be doubled to a 8x8- Returns:
- the dither pattern
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getBayerDither
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
orDITHER_MATRIX_8X8
)col
- the colordoubleMatrix
- true if the 4x4 matrix shall be doubled to a 8x8- Returns:
- the dither pattern
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