Package org.apache.fop.util.bitmap
Class DitherUtil
- java.lang.Object
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- org.apache.fop.util.bitmap.DitherUtil
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public final class DitherUtil extends java.lang.Object
Utility methods for dithering.
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Field Summary
Fields Modifier and Type Field Description 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)
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Method Summary
All Methods Static Methods Concrete Methods 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, java.awt.Color col, boolean doubleMatrix)
Returns a byte array containing the dither pattern for the given 8-bit gray value.
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Field Detail
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DITHER_MATRIX_2X2
public static final int DITHER_MATRIX_2X2
Selects a 2x2 Bayer dither matrix (5 grayscales)- See Also:
- Constant Field Values
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DITHER_MATRIX_4X4
public static final int DITHER_MATRIX_4X4
Selects a 4x4 Bayer dither matrix (17 grayscales)- See Also:
- Constant Field Values
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DITHER_MATRIX_8X8
public static final int DITHER_MATRIX_8X8
Selects a 8x8 Bayer dither matrix (65 grayscales)- See Also:
- Constant Field Values
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Method Detail
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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
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
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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