Author: damjan
Date: Wed Dec 12 04:26:16 2012
New Revision: 1420517
URL: http://svn.apache.org/viewvc?rev=1420517&view=rev
Log:
Add a Floyd-Steinberg dithering implementation.
Added:
commons/proper/imaging/trunk/src/main/java/org/apache/commons/imaging/palette/Dithering.java
(with props)
Added:
commons/proper/imaging/trunk/src/main/java/org/apache/commons/imaging/palette/Dithering.java
URL:
http://svn.apache.org/viewvc/commons/proper/imaging/trunk/src/main/java/org/apache/commons/imaging/palette/Dithering.java?rev=1420517&view=auto
==============================================================================
---
commons/proper/imaging/trunk/src/main/java/org/apache/commons/imaging/palette/Dithering.java
(added)
+++
commons/proper/imaging/trunk/src/main/java/org/apache/commons/imaging/palette/Dithering.java
Wed Dec 12 04:26:16 2012
@@ -0,0 +1,102 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.commons.imaging.palette;
+
+import java.awt.image.BufferedImage;
+
+import org.apache.commons.imaging.ImageWriteException;
+
+public class Dithering {
+ public static void applyFloydSteinbergDithering(BufferedImage image,
Palette palette) throws ImageWriteException {
+ for (int y = 0; y < image.getHeight(); y++) {
+ for (int x = 0; x < image.getWidth(); x++) {
+ int argb = image.getRGB(x, y);
+ int index = palette.getPaletteIndex(argb);
+ int nextArgb = palette.getEntry(index);
+ image.setRGB(x, y, nextArgb);
+
+ int a = (argb >> 24) & 0xff;
+ int r = (argb >> 16) & 0xff;
+ int g = (argb >> 8) & 0xff;
+ int b = argb & 0xff;
+
+ int na = (nextArgb >> 24) & 0xff;
+ int nr = (nextArgb >> 16) & 0xff;
+ int ng = (nextArgb >> 8) & 0xff;
+ int nb = nextArgb & 0xff;
+
+ int errA = a - na;
+ int errR = r - nr;
+ int errG = g - ng;
+ int errB = b - nb;
+
+ if (x + 1 < image.getWidth()) {
+ int update = adjustPixel(image.getRGB(x + 1, y), errA,
errR, errG, errB, 7);
+ image.setRGB(x + 1, y, update);
+ if (y + 1 < image.getHeight()) {
+ update = adjustPixel(image.getRGB(x + 1, y + 1), errA,
errR, errG, errB, 1);
+ image.setRGB(x + 1, y + 1, update);
+ }
+ }
+ if (y + 1 < image.getHeight()) {
+ int update = adjustPixel(image.getRGB(x, y + 1), errA,
errR, errG, errB, 5);
+ image.setRGB(x, y + 1, update);
+ if (x - 1 >= 0) {
+ update = adjustPixel(image.getRGB(x - 1, y + 1), errA,
errR, errG, errB, 3);
+ image.setRGB(x - 1, y + 1, update);
+ }
+
+ }
+ }
+ }
+ }
+
+ private static int adjustPixel(int argb, int errA, int errR, int errG, int
errB, int mul) {
+ int a = (argb >> 24) & 0xff;
+ int r = (argb >> 16) & 0xff;
+ int g = (argb >> 8) & 0xff;
+ int b = argb & 0xff;
+
+ a += errA*mul/16;
+ r += errR*mul/16;
+ g += errG*mul/16;
+ b += errB*mul/16;
+
+ if (a < 0) {
+ a = 0;
+ } else if (a > 0xff) {
+ a = 0xff;
+ }
+ if (r < 0) {
+ r = 0;
+ } else if (r > 0xff) {
+ r = 0xff;
+ }
+ if (g < 0) {
+ g = 0;
+ } else if (g > 0xff) {
+ g = 0xff;
+ }
+ if (b < 0) {
+ b = 0;
+ } else if (b > 0xff) {
+ b = 0xff;
+ }
+
+ return (a << 24) | (r << 16) | (g << 8) | b;
+ }
+}
Propchange:
commons/proper/imaging/trunk/src/main/java/org/apache/commons/imaging/palette/Dithering.java
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svn:eol-style = native
