Android对图片进行高斯模糊
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高斯模糊工具类:
import android.graphics.Bitmap;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.os.Handler;import android.os.Message;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;/** * Created by du on 17/5/26. */public class BitmapBlurUtils { private static ExecutorService executor; private static int POOL_SIZE = 2;// 单个CPU线程池大小 private static ExecutorService getExecutor() { if (executor == null) { int cpuNums = Runtime.getRuntime().availableProcessors(); executor = Executors.newFixedThreadPool(cpuNums * POOL_SIZE); } return executor; } public static void addTask(Bitmap bitmap, Handler handler) { getExecutor().submit(new BitmapVagueTask(bitmap, handler)); } /** 水平方向模糊度 */ private static float hRadius = 500; /** 竖直方向模糊度 */ private static float vRadius = 500; /** 模糊迭代度 */ private static int iterations = 1; /** * 异步 */ private static class BitmapVagueTask implements Runnable { private Bitmap bitmap; private Handler handler; public BitmapVagueTask(Bitmap bitmap, Handler handler) { super(); this.bitmap = bitmap; this.handler = handler; } @Override public void run() { boxBlurFilter(bitmap, handler); } } /** * 高斯模糊 * * @param bmp * @return */ private static void boxBlurFilter(Bitmap bmp, Handler handler) { int width = bmp.getWidth(); int height = bmp.getHeight(); int[] inPixels = new int[width * height]; int[] outPixels = new int[width * height]; Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); bmp.getPixels(inPixels, 0, width, 0, 0, width, height); for (int i = 0; i < iterations; i++) { blur(inPixels, outPixels, width, height, hRadius); blur(outPixels, inPixels, height, width, vRadius); } blurFractional(inPixels, outPixels, width, height, hRadius); blurFractional(outPixels, inPixels, height, width, vRadius); bitmap.setPixels(inPixels, 0, width, 0, 0, width, height); if (handler != null) { @SuppressWarnings("deprecation") Drawable drawable = new BitmapDrawable(bitmap); Message message = new Message(); message.obj = drawable; handler.sendMessage(message); } } private static void blur(int[] in, int[] out, int width, int height,float radius) { int widthMinus1 = width - 1; int r = (int) radius; int tableSize = 2 * r + 1; int divide[] = new int[256 * tableSize]; for (int i = 0; i < 256 * tableSize; i++) divide[i] = i / tableSize; int inIndex = 0; for (int y = 0; y < height; y++) { int outIndex = y; int ta = 0, tr = 0, tg = 0, tb = 0; for (int i = -r; i <= r; i++) { int rgb = in[inIndex + clamp(i, 0, width - 1)]; ta += (rgb >> 24) & 0xff; tr += (rgb >> 16) & 0xff; tg += (rgb >> 8) & 0xff; tb += rgb & 0xff; } for (int x = 0; x < width; x++) { out[outIndex] = (divide[ta] << 24) | (divide[tr] << 16) | (divide[tg] << 8) | divide[tb]; int i1 = x + r + 1; if (i1 > widthMinus1) i1 = widthMinus1; int i2 = x - r; if (i2 < 0) i2 = 0; int rgb1 = in[inIndex + i1]; int rgb2 = in[inIndex + i2]; ta += ((rgb1 >> 24) & 0xff) - ((rgb2 >> 24) & 0xff); tr += ((rgb1 & 0xff0000) - (rgb2 & 0xff0000)) >> 16; tg += ((rgb1 & 0xff00) - (rgb2 & 0xff00)) >> 8; tb += (rgb1 & 0xff) - (rgb2 & 0xff); outIndex += height; } inIndex += width; } } private static void blurFractional(int[] in, int[] out, int width, int height, float radius) { radius -= (int) radius; float f = 1.0f / (1 + 2 * radius); int inIndex = 0; for (int y = 0; y < height; y++) { int outIndex = y; out[outIndex] = in[0]; outIndex += height; for (int x = 1; x < width - 1; x++) { int i = inIndex + x; int rgb1 = in[i - 1]; int rgb2 = in[i]; int rgb3 = in[i + 1]; int a1 = (rgb1 >> 24) & 0xff; int r1 = (rgb1 >> 16) & 0xff; int g1 = (rgb1 >> 8) & 0xff; int b1 = rgb1 & 0xff; int a2 = (rgb2 >> 24) & 0xff; int r2 = (rgb2 >> 16) & 0xff; int g2 = (rgb2 >> 8) & 0xff; int b2 = rgb2 & 0xff; int a3 = (rgb3 >> 24) & 0xff; int r3 = (rgb3 >> 16) & 0xff; int g3 = (rgb3 >> 8) & 0xff; int b3 = rgb3 & 0xff; a1 = a2 + (int) ((a1 + a3) * radius); r1 = r2 + (int) ((r1 + r3) * radius); g1 = g2 + (int) ((g1 + g3) * radius); b1 = b2 + (int) ((b1 + b3) * radius); a1 *= f; r1 *= f; g1 *= f; b1 *= f; out[outIndex] = (a1 << 24) | (r1 << 16) | (g1 << 8) | b1; outIndex += height; } out[outIndex] = in[width - 1]; inIndex += width; } } public static int clamp(int x, int a, int b) { return (x < a) ? a : (x > b) ? b : x; }}
使用方法:
BitmapBlurUtils.addTask(loadedImage, new Handler() { @Override public void handleMessage(Message msg) { super.handleMessage(msg); Drawable drawable = (Drawable) msg.obj; iv.setImageDrawable(drawable); loadedImage.recycle(); } });
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