package com.sina.weibo.story.common.util;
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import android.content.Context;
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import android.graphics.Bitmap;
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import android.os.Build;
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import android.renderscript.Allocation;
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import android.renderscript.Element;
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import android.renderscript.RenderScript;
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import android.renderscript.ScriptIntrinsicBlur;
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/**
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* Created by haohua on 2018/1/19.
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*/
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public class EasyBlur {
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private static final String TAG = "EasyBlur";
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private static final float SCALE = 1 / 8.0F;//default scale
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private static volatile EasyBlur singleton = null;
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private Bitmap mBitmap;
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private int mRadius = 0;
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private float mScale = SCALE;
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private Context mContext;
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private BlurPolicy mPolicy = BlurPolicy.RS_BLUR;//默认使用rs 模糊图片
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public enum BlurPolicy {
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RS_BLUR,
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FAST_BLUR
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}
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/**
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* 单例
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*
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* @param context
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* @return
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*/
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public static EasyBlur with(Context context) {
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if (singleton == null) {
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synchronized (EasyBlur.class) {
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if (singleton == null) {
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singleton = new EasyBlur(context);
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}
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}
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}
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return singleton;
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}
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private EasyBlur(Context context) {
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this.mContext = context.getApplicationContext();
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}
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public Bitmap blur() {
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if (mBitmap == null) {
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throw new RuntimeException("Bitmap can not be null");
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}
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if (mRadius == 0) {
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throw new RuntimeException("radius must > 0");
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}
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if (mPolicy == BlurPolicy.FAST_BLUR) {
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return fastBlur(mBitmap, mScale, mRadius);
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} else {
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return rsBlur(mContext, mBitmap, mRadius, mScale);
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}
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}
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/**
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* 模糊的算法策略
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*
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* @param policy
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* @return
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*/
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public EasyBlur policy(BlurPolicy policy) {
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this.mPolicy = policy;
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return this;
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}
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/**
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* 模糊的Bitmap
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*
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* @param bitmap
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* @return
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*/
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public EasyBlur bitmap(Bitmap bitmap) {
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this.mBitmap = bitmap;
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return this;
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}
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/**
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* 缩放的系数
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*
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* @param scale
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* @return
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*/
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public EasyBlur scale(int scale) {
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this.mScale = 1.0f / scale;
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return this;
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}
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/**
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* 模糊的半径，0-25
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*
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* @param radius
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* @return
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*/
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public EasyBlur radius(int radius) {
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this.mRadius = radius;
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return this;
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}
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/**
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* 使用RenderScript 模糊图片
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*
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* @param context
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* @param source
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* @return
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*/
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private static Bitmap rsBlur(Context context, Bitmap source, int radius, float scale) {
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int width = Math.round(source.getWidth() * scale);
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int height = Math.round(source.getHeight() * scale);
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Bitmap inputBmp = Bitmap.createScaledBitmap(source, width, height, false);
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RenderScript renderScript = RenderScript.create(context);
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// Allocate memory for Renderscript to work with
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final Allocation input = Allocation.createFromBitmap(renderScript, inputBmp);
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final Allocation output = Allocation.createTyped(renderScript, input.getType());
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// Load up an instance of the specific script that we want to use.
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ScriptIntrinsicBlur scriptIntrinsicBlur = ScriptIntrinsicBlur.create(renderScript, Element.U8_4(renderScript));
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scriptIntrinsicBlur.setInput(input);
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// Set the blur radius
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scriptIntrinsicBlur.setRadius(radius);
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// Start the ScriptIntrinisicBlur
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scriptIntrinsicBlur.forEach(output);
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// Copy the output to the blurred bitmap
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output.copyTo(inputBmp);
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renderScript.destroy();
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return inputBmp;
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}
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/**
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* Stack Blur v1.0 from
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* http://www.quasimondo.com/StackBlurForCanvas/StackBlurDemo.html
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* Java Author: Mario Klingemann <mario at quasimondo.com>
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* http://incubator.quasimondo.com
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* <p>
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* created Feburary 29, 2004
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* Android port : Yahel Bouaziz <yahel at kayenko.com>
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* http://www.kayenko.com
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* ported april 5th, 2012
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* <p>
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* This is a compromise between Gaussian Blur and Box blur
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* It creates much better looking blurs than Box Blur, but is
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* 7x faster than my Gaussian Blur implementation.
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* <p>
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* I called it Stack Blur because this describes best how this
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* filter works internally: it creates a kind of moving stack
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* of colors whilst scanning through the image. Thereby it
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* just has to add one new block of color to the right side
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* of the stack and remove the leftmost color. The remaining
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* colors on the topmost layer of the stack are either added on
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* or reduced by one, depending on if they are on the right or
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* on the left side of the stack.
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* <p>
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* If you are using this algorithm in your code please add
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* the following line:
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* Stack Blur Algorithm by Mario Klingemann <mario@quasimondo.com>
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*/
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private static Bitmap fastBlur(Bitmap sentBitmap, float scale, int radius) {
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int width = Math.round(sentBitmap.getWidth() * scale);
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int height = Math.round(sentBitmap.getHeight() * scale);
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sentBitmap = Bitmap.createScaledBitmap(sentBitmap, width, height, false);
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Bitmap bitmap = sentBitmap.copy(sentBitmap.getConfig(), true);
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if (radius < 1) {
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return (null);
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}
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int w = bitmap.getWidth();
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int h = bitmap.getHeight();
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int[] pix = new int[w * h];
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bitmap.getPixels(pix, 0, w, 0, 0, w, h);
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int wm = w - 1;
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int hm = h - 1;
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int wh = w * h;
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int div = radius + radius + 1;
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int r[] = new int[wh];
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int g[] = new int[wh];
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int b[] = new int[wh];
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int rsum, gsum, bsum, x, y, i, p, yp, yi, yw;
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int vmin[] = new int[Math.max(w, h)];
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int divsum = (div + 1) >> 1;
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divsum *= divsum;
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int dv[] = new int[256 * divsum];
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for (i = 0; i < 256 * divsum; i++) {
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dv[i] = (i / divsum);
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}
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yw = yi = 0;
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int[][] stack = new int[div][3];
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int stackpointer;
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int stackstart;
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int[] sir;
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int rbs;
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int r1 = radius + 1;
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int routsum, goutsum, boutsum;
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int rinsum, ginsum, binsum;
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for (y = 0; y < h; y++) {
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rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
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for (i = -radius; i <= radius; i++) {
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p = pix[yi + Math.min(wm, Math.max(i, 0))];
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sir = stack[i + radius];
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sir[0] = (p & 0xff0000) >> 16;
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sir[1] = (p & 0x00ff00) >> 8;
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sir[2] = (p & 0x0000ff);
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rbs = r1 - Math.abs(i);
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rsum += sir[0] * rbs;
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gsum += sir[1] * rbs;
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bsum += sir[2] * rbs;
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if (i > 0) {
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rinsum += sir[0];
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ginsum += sir[1];
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binsum += sir[2];
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} else {
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routsum += sir[0];
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goutsum += sir[1];
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boutsum += sir[2];
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}
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}
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stackpointer = radius;
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for (x = 0; x < w; x++) {
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r[yi] = dv[rsum];
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g[yi] = dv[gsum];
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b[yi] = dv[bsum];
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rsum -= routsum;
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gsum -= goutsum;
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bsum -= boutsum;
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stackstart = stackpointer - radius + div;
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sir = stack[stackstart % div];
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routsum -= sir[0];
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goutsum -= sir[1];
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boutsum -= sir[2];
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if (y == 0) {
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vmin[x] = Math.min(x + radius + 1, wm);
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}
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p = pix[yw + vmin[x]];
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sir[0] = (p & 0xff0000) >> 16;
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sir[1] = (p & 0x00ff00) >> 8;
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sir[2] = (p & 0x0000ff);
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rinsum += sir[0];
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ginsum += sir[1];
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binsum += sir[2];
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rsum += rinsum;
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gsum += ginsum;
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bsum += binsum;
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stackpointer = (stackpointer + 1) % div;
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sir = stack[(stackpointer) % div];
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routsum += sir[0];
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goutsum += sir[1];
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boutsum += sir[2];
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rinsum -= sir[0];
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ginsum -= sir[1];
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binsum -= sir[2];
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yi++;
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}
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yw += w;
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}
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for (x = 0; x < w; x++) {
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rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
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yp = -radius * w;
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for (i = -radius; i <= radius; i++) {
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yi = Math.max(0, yp) + x;
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sir = stack[i + radius];
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sir[0] = r[yi];
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sir[1] = g[yi];
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sir[2] = b[yi];
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rbs = r1 - Math.abs(i);
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rsum += r[yi] * rbs;
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gsum += g[yi] * rbs;
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bsum += b[yi] * rbs;
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if (i > 0) {
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rinsum += sir[0];
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ginsum += sir[1];
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binsum += sir[2];
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} else {
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routsum += sir[0];
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goutsum += sir[1];
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boutsum += sir[2];
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}
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if (i < hm) {
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yp += w;
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}
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}
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yi = x;
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stackpointer = radius;
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for (y = 0; y < h; y++) {
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// Preserve alpha channel: ( 0xff000000 & pix[yi] )
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pix[yi] = (0xff000000 & pix[yi]) | (dv[rsum] << 16) | (dv[gsum] << 8) | dv[bsum];
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rsum -= routsum;
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gsum -= goutsum;
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bsum -= boutsum;
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stackstart = stackpointer - radius + div;
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sir = stack[stackstart % div];
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routsum -= sir[0];
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goutsum -= sir[1];
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boutsum -= sir[2];
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if (x == 0) {
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vmin[y] = Math.min(y + r1, hm) * w;
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}
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p = x + vmin[y];
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sir[0] = r[p];
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sir[1] = g[p];
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sir[2] = b[p];
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rinsum += sir[0];
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ginsum += sir[1];
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binsum += sir[2];
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rsum += rinsum;
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gsum += ginsum;
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bsum += binsum;
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stackpointer = (stackpointer + 1) % div;
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sir = stack[stackpointer];
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routsum += sir[0];
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goutsum += sir[1];
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boutsum += sir[2];
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rinsum -= sir[0];
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ginsum -= sir[1];
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binsum -= sir[2];
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yi += w;
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}
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}
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bitmap.setPixels(pix, 0, w, 0, 0, w, h);
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return (bitmap);
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}
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}
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