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/*
Copyright 2006 Jerry Huxtable
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package com.jhlabs.image;
import java.awt.*;
import java.awt.image.*;
public class DitherFilter extends PointFilter implements java.io.Serializable {
static final long serialVersionUID = 2408287445119636967L;
protected final static int[] ditherMagic2x2Matrix = {
0, 2,
3, 1
};
protected final static int[] ditherMagic4x4Matrix = {
0, 14, 3, 13,
11, 5, 8, 6,
12, 2, 15, 1,
7, 9, 4, 10
};
public final static int[] ditherOrdered4x4Matrix = {
0, 8, 2, 10,
12, 4, 14, 6,
3, 11, 1, 9,
15, 7, 13, 5
};
public final static int[] ditherLines4x4Matrix = {
0, 1, 2, 3,
4, 5, 6, 7,
8, 9, 10, 11,
12, 13, 14, 15
};
public final static int[] dither90Halftone6x6Matrix = {
29, 18, 12, 19, 30, 34,
17, 7, 4, 8, 20, 28,
11, 3, 0, 1, 9, 27,
16, 6, 2, 5, 13, 26,
25, 15, 10, 14, 21, 31,
33, 25, 24, 23, 33, 36
};
/*
* The following dithering matrices are taken from "Digital Halftoning"
* by Robert Ulichney, MIT Press, ISBN 0-262-21009-6.
*/
/* Order-6 ordered dither */
public final static int[] ditherOrdered6x6Matrix = {
1, 59, 15, 55, 2, 56, 12, 52,
33, 17, 47, 31, 34, 18, 44, 28,
9, 49, 5, 63, 10, 50, 6, 60,
41, 25, 37, 21, 42, 26, 38, 22,
3, 57, 13, 53, 0, 58, 14, 54,
35, 19, 45, 29, 32, 16, 46, 30,
11, 51, 7, 61, 8, 48, 4, 62,
43, 27, 39, 23, 40, 24, 36, 20
};
/* Order-8 ordered dither */
public final static int[] ditherOrdered8x8Matrix = {
1,235, 59,219, 15,231, 55,215, 2,232, 56,216, 12,228, 52,212,
129, 65,187,123,143, 79,183,119,130, 66,184,120,140, 76,180,116,
33,193, 17,251, 47,207, 31,247, 34,194, 18,248, 44,204, 28,244,
161, 97,145, 81,175,111,159, 95,162, 98,146, 82,172,108,156, 92,
9,225, 49,209, 5,239, 63,223, 10,226, 50,210, 6,236, 60,220,
137, 73,177,113,133, 69,191,127,138, 74,178,114,134, 70,188,124,
41,201, 25,241, 37,197, 21,255, 42,202, 26,242, 38,198, 22,252,
169,105,153, 89,165,101,149, 85,170,106,154, 90,166,102,150, 86,
3,233, 57,217, 13,229, 53,213, 0,234, 58,218, 14,230, 54,214,
131, 67,185,121,141, 77,181,117,128, 64,186,122,142, 78,182,118,
35,195, 19,249, 45,205, 29,245, 32,192, 16,250, 46,206, 30,246,
163, 99,147, 83,173,109,157, 93,160, 96,144, 80,174,110,158, 94,
11,227, 51,211, 7,237, 61,221, 8,224, 48,208, 4,238, 62,222,
139, 75,179,115,135, 71,189,125,136, 72,176,112,132, 68,190,126,
43,203, 27,243, 39,199, 23,253, 40,200, 24,240, 36,196, 20,254,
171,107,155, 91,167,103,151, 87,168,104,152, 88,164,100,148, 84 };
/* Order-3 clustered dither */
public final static int[] ditherCluster3Matrix = {
9,11,10, 8, 6, 7,
12,17,16, 5, 0, 1,
13,14,15, 4, 3, 2,
8, 6, 7, 9,11,10,
5, 0, 1,12,17,16,
4, 3, 2,13,14,15 };
/* Order-4 clustered dither */
public final static int[] ditherCluster4Matrix = {
18,20,19,16,13,11,12,15,
27,28,29,22, 4, 3, 2, 9,
26,31,30,21, 5, 0, 1,10,
23,25,24,17, 8, 6, 7,14,
13,11,12,15,18,20,19,16,
4, 3, 2, 9,27,28,29,22,
5, 0, 1,10,26,31,30,21,
8, 6, 7,14,23,25,24,17 };
/* Order-8 clustered dither */
public final static int[] ditherCluster8Matrix = {
64, 69, 77, 87, 86, 76, 68, 67, 63, 58, 50, 40, 41, 51, 59, 60,
70, 94,100,109,108, 99, 93, 75, 57, 33, 27, 18, 19, 28, 34, 52,
78,101,114,116,115,112, 98, 83, 49, 26, 13, 11, 12, 15, 29, 44,
88,110,123,124,125,118,107, 85, 39, 17, 4, 3, 2, 9, 20, 42,
89,111,122,127,126,117,106, 84, 38, 16, 5, 0, 1, 10, 21, 43,
79,102,119,121,120,113, 97, 82, 48, 25, 8, 6, 7, 14, 30, 45,
71, 95,103,104,105, 96, 92, 74, 56, 32, 24, 23, 22, 31, 35, 53,
65, 72, 80, 90, 91, 81, 73, 66, 62, 55, 47, 37, 36, 46, 54, 61,
63, 58, 50, 40, 41, 51, 59, 60, 64, 69, 77, 87, 86, 76, 68, 67,
57, 33, 27, 18, 19, 28, 34, 52, 70, 94,100,109,108, 99, 93, 75,
49, 26, 13, 11, 12, 15, 29, 44, 78,101,114,116,115,112, 98, 83,
39, 17, 4, 3, 2, 9, 20, 42, 88,110,123,124,125,118,107, 85,
38, 16, 5, 0, 1, 10, 21, 43, 89,111,122,127,126,117,106, 84,
48, 25, 8, 6, 7, 14, 30, 45, 79,102,119,121,120,113, 97, 82,
56, 32, 24, 23, 22, 31, 35, 53, 71, 95,103,104,105, 96, 92, 74,
62, 55, 47, 37, 36, 46, 54, 61, 65, 72, 80, 90, 91, 81, 73, 66 };
public int[] matrix;
public int rows, cols, levels;
protected int[] mod;
protected int[] div;
protected int[] map;
public boolean colorDither;
private boolean initialized = false;
public DitherFilter() {
rows = 2;
cols = 2;
matrix = ditherMagic4x4Matrix;
levels = 6;
colorDither = true;
}
public void setMatrix(int[] matrix) {
this.matrix = matrix;
}
public int[] getMatrix() {
return matrix;
}
public void setLevels(int levels) {
this.levels = levels;
}
public int getLevels() {
return levels;
}
protected void initialize() {
rows = cols = (int)Math.sqrt(matrix.length);
map = new int[levels];
for (int i = 0; i < levels; i++) {
int v = 255 * i / (levels-1);
map[i] = v;
}
div = new int[256];
mod = new int[256];
int rc = (rows*cols+1);
for (int i = 0; i < 256; i++) {
div[i] = (levels-1)*i / 256;
mod[i] = i*rc/256;
}
}
public int filterRGB(int x, int y, int rgb) {
if (!initialized) {
initialized = true;
initialize();
}
int a = rgb & 0xff000000;
int r = (rgb >> 16) & 0xff;
int g = (rgb >> 8) & 0xff;
int b = rgb & 0xff;
int col = x % cols;
int row = y % rows;
int v = matrix[row*cols+col];
if (colorDither) {
r = map[mod[r] > v ? div[r] + 1 : div[r]];
g = map[mod[g] > v ? div[g] + 1 : div[g]];
b = map[mod[b] > v ? div[b] + 1 : div[b]];
} else {
int value = (r+g+b)/3;
r = g = b = map[mod[value] > v ? div[value] + 1 : div[value]];
}
return a | (r << 16) | (g << 8) | b;
}
public String toString() {
return "Colors/Dither...";
}
}
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