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-rw-r--r--awt/java/awt/image/AreaAveragingScaleFilter.java288
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diff --git a/awt/java/awt/image/AreaAveragingScaleFilter.java b/awt/java/awt/image/AreaAveragingScaleFilter.java
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-/*
- * 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;
-
-import java.util.Arrays;
-
-/**
- * The AreaAveragingScaleFilter class scales the source image using area
- * averaging algorithm. This algorithm provides a source image with a new image
- * containing the resampled image.
- *
- * @since Android 1.0
- */
-public class AreaAveragingScaleFilter extends ReplicateScaleFilter {
-
- /**
- * The Constant rgbCM.
- */
- private static final ColorModel rgbCM = ColorModel.getRGBdefault();
-
- /**
- * The Constant averagingFlags.
- */
- private static final int averagingFlags = (ImageConsumer.TOPDOWNLEFTRIGHT | ImageConsumer.COMPLETESCANLINES);
-
- /**
- * The reset.
- */
- private boolean reset = true; // Flag for used superclass filter
-
- /**
- * The inited.
- */
- private boolean inited = false; // All data inited
-
- /**
- * The sum_r.
- */
- private int sum_r[]; // Array for average Red samples
-
- /**
- * The sum_g.
- */
- private int sum_g[]; // Array for average Green samples
-
- /**
- * The sum_b.
- */
- private int sum_b[]; // Array for average Blue samples
-
- /**
- * The sum_a.
- */
- private int sum_a[]; // Array for average Alpha samples
-
- /**
- * The buff.
- */
- private int buff[]; // Stride buffer
-
- /**
- * The avg factor.
- */
- private int avgFactor; // Global averaging factor
-
- /**
- * The cached dy.
- */
- private int cachedDY; // Cached number of the destination scanline
-
- /**
- * The cached dv rest.
- */
- private int cachedDVRest; // Cached value of rest src scanlines for sum
-
- // pixel samples
- // Because data if transferring by whole scanlines
- // we are caching only Y coordinate values
-
- /**
- * Instantiates a new AreaAveragingScaleFilter object which scales a source
- * image with the specified width and height.
- *
- * @param width
- * the scaled width of the image.
- * @param height
- * the scaled height of the image.
- */
- public AreaAveragingScaleFilter(int width, int height) {
- super(width, height);
- }
-
- @Override
- public void setPixels(int x, int y, int w, int h, ColorModel model, int[] pixels, int off,
- int scansize) {
- if (reset) {
- super.setPixels(x, y, w, h, model, pixels, off, scansize);
- } else {
- setFilteredPixels(x, y, w, h, model, pixels, off, scansize);
- }
- }
-
- @Override
- public void setPixels(int x, int y, int w, int h, ColorModel model, byte[] pixels, int off,
- int scansize) {
- if (reset) {
- super.setPixels(x, y, w, h, model, pixels, off, scansize);
- } else {
- setFilteredPixels(x, y, w, h, model, pixels, off, scansize);
- }
- }
-
- @Override
- public void setHints(int hints) {
- super.setHints(hints);
- reset = ((hints & averagingFlags) != averagingFlags);
- }
-
- /**
- * This method implements the Area Averaging Scale filter. The description
- * of algorithm is presented in Java API Specification. Arrays sum_r, sum_g,
- * sum_b, sum_a have length equals width of destination image. In each
- * array's element is accumulating pixel's component values, proportional to
- * the area which source pixels will occupy in destination image. Then that
- * values will divide by Global averaging factor (area of the destination
- * image) for receiving average values of destination pixels.
- *
- * @param x
- * the source pixels X coordinate.
- * @param y
- * the source pixels Y coordinate.
- * @param w
- * the width of the area of the source pixels.
- * @param h
- * the height of the area of the source pixels.
- * @param model
- * the color model of the source pixels.
- * @param pixels
- * the array of source pixels.
- * @param off
- * the offset into the source pixels array.
- * @param scansize
- * the length of scanline in the pixels array.
- */
- private void setFilteredPixels(int x, int y, int w, int h, ColorModel model, Object pixels,
- int off, int scansize) {
- if (!inited) {
- initialize();
- }
-
- int srcX, srcY, dx, dy;
- int svRest, dvRest, shRest, dhRest, vDif, hDif;
-
- if (y == 0) {
- dy = 0;
- dvRest = srcHeight;
- } else {
- dy = cachedDY;
- dvRest = cachedDVRest;
- }
-
- srcY = y;
- svRest = destHeight;
-
- int srcOff = off;
- while (srcY < y + h) {
- if (svRest < dvRest) {
- vDif = svRest;
- } else {
- vDif = dvRest;
- }
-
- srcX = 0;
- dx = 0;
- shRest = destWidth;
- dhRest = srcWidth;
- while (srcX < w) {
- if (shRest < dhRest) {
- hDif = shRest;
- } else {
- hDif = dhRest;
- }
- int avg = hDif * vDif; // calculation of contribution factor
-
- int rgb, pix;
- if (pixels instanceof int[]) {
- pix = ((int[])pixels)[srcOff + srcX];
- } else {
- pix = ((byte[])pixels)[srcOff + srcX] & 0xff;
- }
-
- rgb = model.getRGB(pix);
- int a = rgb >>> 24;
- int r = (rgb >> 16) & 0xff;
- int g = (rgb >> 8) & 0xff;
- int b = rgb & 0xff;
-
- // accumulating pixel's component values
- sum_a[dx] += a * avg;
- sum_r[dx] += r * avg;
- sum_g[dx] += g * avg;
- sum_b[dx] += b * avg;
-
- shRest -= hDif;
- dhRest -= hDif;
-
- if (shRest == 0) {
- srcX++;
- shRest = destWidth;
- }
-
- if (dhRest == 0) {
- dx++;
- dhRest = srcWidth;
- }
- }
-
- svRest -= vDif;
- dvRest -= vDif;
-
- if (svRest == 0) {
- svRest = destHeight;
- srcY++;
- srcOff += scansize;
- }
-
- if (dvRest == 0) {
- // averaging destination pixel's values
- for (int i = 0; i < destWidth; i++) {
- int a = (sum_a[i] / avgFactor) & 0xff;
- int r = (sum_r[i] / avgFactor) & 0xff;
- int g = (sum_g[i] / avgFactor) & 0xff;
- int b = (sum_b[i] / avgFactor) & 0xff;
- int frgb = (a << 24) | (r << 16) | (g << 8) | b;
- buff[i] = frgb;
- }
- consumer.setPixels(0, dy, destWidth, 1, rgbCM, buff, 0, destWidth);
- dy++;
- dvRest = srcHeight;
- Arrays.fill(sum_a, 0);
- Arrays.fill(sum_r, 0);
- Arrays.fill(sum_g, 0);
- Arrays.fill(sum_b, 0);
- }
-
- }
-
- cachedDY = dy;
- cachedDVRest = dvRest;
-
- }
-
- /**
- * Initialization of the auxiliary data.
- */
- private void initialize() {
-
- sum_a = new int[destWidth];
- sum_r = new int[destWidth];
- sum_g = new int[destWidth];
- sum_b = new int[destWidth];
-
- buff = new int[destWidth];
- outpixbuf = buff;
- avgFactor = srcWidth * srcHeight;
-
- inited = true;
- }
-}
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