| /* |
| * 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. |
| */ |
| /** |
| * @author Igor V. Stolyarov |
| * @version $Revision$ |
| */ |
| |
| package java.awt.image; |
| |
| /** |
| * The RGBImageFilter class represents a filter which modifies pixels of an |
| * image in the default RGB ColorModel. |
| * |
| * @since Android 1.0 |
| */ |
| public abstract class RGBImageFilter extends ImageFilter { |
| |
| /** |
| * The original model is the ColorModel to be replaced by the new model when |
| * substituteColorModel is called. |
| */ |
| protected ColorModel origmodel; |
| |
| /** |
| * The new model is the ColorModel with which to replace the original model |
| * when substituteColorModel is called. |
| */ |
| protected ColorModel newmodel; |
| |
| /** |
| * The canFilterIndexColorModel indicates if it is acceptable to apply the |
| * color filtering of the filterRGB method to the color table entries of an |
| * IndexColorModel object. |
| */ |
| protected boolean canFilterIndexColorModel; |
| |
| /** |
| * Instantiates a new RGBImageFilter. |
| */ |
| public RGBImageFilter() { |
| } |
| |
| /** |
| * Filters an IndexColorModel object by calling filterRGB function for each |
| * entry of IndexColorModel. |
| * |
| * @param icm |
| * the IndexColorModel to be filtered. |
| * @return the IndexColorModel. |
| */ |
| public IndexColorModel filterIndexColorModel(IndexColorModel icm) { |
| int transferType = icm.getTransferType(); |
| int bits = icm.getPixelSize(); |
| int mapSize = icm.getMapSize(); |
| int colorMap[] = new int[mapSize]; |
| int filteredColorMap[] = new int[mapSize]; |
| icm.getRGBs(colorMap); |
| int trans = -1; |
| boolean hasAlpha = false; |
| for (int i = 0; i < mapSize; i++) { |
| filteredColorMap[i] = filterRGB(-1, -1, colorMap[i]); |
| int alpha = filteredColorMap[i] >>> 24; |
| if (alpha != 0xff) { |
| if (!hasAlpha) { |
| hasAlpha = true; |
| } |
| if (alpha == 0 && trans < 0) { |
| trans = i; |
| } |
| } |
| } |
| |
| return new IndexColorModel(bits, mapSize, filteredColorMap, 0, hasAlpha, trans, |
| transferType); |
| } |
| |
| /** |
| * Replaces the original color model and the new one. |
| * |
| * @param oldcm |
| * the old ColorModel. |
| * @param newcm |
| * the new ColorModel. |
| */ |
| public void substituteColorModel(ColorModel oldcm, ColorModel newcm) { |
| origmodel = oldcm; |
| newmodel = newcm; |
| } |
| |
| @Override |
| public void setColorModel(ColorModel model) { |
| if (model instanceof IndexColorModel && canFilterIndexColorModel) { |
| IndexColorModel icm = (IndexColorModel)model; |
| ColorModel filteredModel = filterIndexColorModel(icm); |
| substituteColorModel(model, filteredModel); |
| consumer.setColorModel(filteredModel); |
| } else { |
| consumer.setColorModel(ColorModel.getRGBdefault()); |
| } |
| } |
| |
| @Override |
| public void setPixels(int x, int y, int w, int h, ColorModel model, int[] pixels, int off, |
| int scansize) { |
| |
| if (model == null || model == origmodel) { |
| consumer.setPixels(x, y, w, h, newmodel, pixels, off, scansize); |
| } else { |
| int rgbPixels[] = new int[w]; |
| for (int sy = y, pixelsOff = off; sy < y + h; sy++, pixelsOff += scansize) { |
| |
| for (int sx = x, idx = 0; sx < x + w; sx++, idx++) { |
| rgbPixels[idx] = model.getRGB(pixels[pixelsOff + idx]); |
| } |
| filterRGBPixels(x, sy, w, 1, rgbPixels, 0, w); |
| } |
| } |
| } |
| |
| @Override |
| public void setPixels(int x, int y, int w, int h, ColorModel model, byte[] pixels, int off, |
| int scansize) { |
| |
| if (model == null || model == origmodel) { |
| consumer.setPixels(x, y, w, h, newmodel, pixels, off, scansize); |
| } else { |
| int rgbPixels[] = new int[w]; |
| for (int sy = y, pixelsOff = off; sy < y + h; sy++, pixelsOff += scansize) { |
| |
| for (int sx = x, idx = 0; sx < x + w; sx++, idx++) { |
| rgbPixels[idx] = model.getRGB(pixels[pixelsOff + idx] & 0xff); |
| } |
| filterRGBPixels(x, sy, w, 1, rgbPixels, 0, w); |
| } |
| } |
| } |
| |
| /** |
| * Filters a region of pixels in the default RGB ColorModel by calling the |
| * filterRGB method for them. |
| * |
| * @param x |
| * the X coordinate of region. |
| * @param y |
| * the Y coordinate of region. |
| * @param w |
| * the width of region. |
| * @param h |
| * the height of region. |
| * @param pixels |
| * the pixels array. |
| * @param off |
| * the offset of array. |
| * @param scansize |
| * the distance between rows of pixels in the array. |
| */ |
| public void filterRGBPixels(int x, int y, int w, int h, int[] pixels, int off, int scansize) { |
| |
| for (int sy = y, lineOff = off; sy < y + h; sy++, lineOff += scansize) { |
| for (int sx = x, idx = 0; sx < x + w; sx++, idx++) { |
| pixels[lineOff + idx] = filterRGB(sx, sy, pixels[lineOff + idx]); |
| } |
| } |
| consumer.setPixels(x, y, w, h, ColorModel.getRGBdefault(), pixels, off, scansize); |
| } |
| |
| /** |
| * Converts a single input pixel in the default RGB ColorModel to a single |
| * output pixel. |
| * |
| * @param x |
| * the X pixel's coordinate. |
| * @param y |
| * the Y pixel's coordinate. |
| * @param rgb |
| * a pixel in the default RGB color model. |
| * @return a filtered pixel in the default RGB color model. |
| */ |
| public abstract int filterRGB(int x, int y, int rgb); |
| |
| } |