package com.example.administrator.text2.util;
import android.content.Context;
import android.graphics.Bitmap;
import android.support.v8.renderscript.Allocation;
import android.support.v8.renderscript.Element;
import android.support.v8.renderscript.RenderScript;
import android.support.v8.renderscript.ScriptIntrinsicBlur;
import android.util.Log;
import static android.os.Build.VERSION.SDK_INT;
/**
* Created by zhouwei on 17/3/6.
*/
public class EasyBlur {
private static final String TAG = "EasyBlur";
private static final float SCALE = 1 / 8.0F;//default scale
private static volatile EasyBlur singleton = null;
private Bitmap mBitmap;
private int mRadius = 0;
private float mScale = SCALE;
private Context mContext;
private BlurPolicy mPolicy = BlurPolicy.RS_BLUR;//默认使用rs 模糊图片
public enum BlurPolicy{
RS_BLUR,
FAST_BLUR
}
/**
* 单例
* @param context
* @return
*/
public static EasyBlur with(Context context){
if (singleton == null) {
synchronized (com.example.administrator.text2.util.EasyBlur.class) {
if (singleton == null) {
singleton = new EasyBlur(context);
}
}
}
return singleton;
}
private EasyBlur(Context context){
this.mContext = context.getApplicationContext();
}
public Bitmap blur(){
if(mBitmap == null){
throw new RuntimeException("Bitmap can not be null");
}
if(mRadius == 0){
throw new RuntimeException("radius must > 0");
}
if(SDK_INT > 8){// support library running on 2.3(API 9) and higher 算法
if(mPolicy == BlurPolicy.FAST_BLUR){
Log.d(TAG,"blur fast algorithm");
return fastBlur(mBitmap,mScale,mRadius);
}else{
Log.d(TAG,"blur render script algorithm");
return rsBlur(mContext,mBitmap,mRadius,mScale);
}
}else{
Log.d(TAG,"blur fast algorithm");
return fastBlur(mBitmap,mScale,mRadius);
}
}
/**
* 模糊的算法策略
* @param policy
* @return
*/
public EasyBlur policy(BlurPolicy policy){
this.mPolicy = policy;
return this;
}
/**
* 模糊的Bitmap
* @param bitmap
* @return
*/
public EasyBlur bitmap(Bitmap bitmap){
this.mBitmap = bitmap;
return this;
}
/**
* 缩放的系数
* @param scale
* @return
*/
public EasyBlur scale(int scale){
this.mScale = 1.0f / scale;
return this;
}
/**
* 模糊的半径，0-25
* @param radius
* @return
*/
public EasyBlur radius(int radius){
this.mRadius = radius;
return this;
}
/**
* 使用RenderScript 模糊图片
* @param context
* @param source
* @return
*/
private static Bitmap rsBlur(Context context,Bitmap source,int radius,float scale){
Log.i(TAG,"origin size:"+source.getWidth()+"*"+source.getHeight());
int width = Math.round(source.getWidth() * scale);
int height = Math.round(source.getHeight() * scale);
Bitmap inputBmp = Bitmap.createScaledBitmap(source,width,height,false);
RenderScript renderScript = RenderScript.create(context);
Log.i(TAG,"scale size:"+inputBmp.getWidth()+"*"+inputBmp.getHeight());
// Allocate memory for Renderscript to work with
final Allocation input = Allocation.createFromBitmap(renderScript,inputBmp);
final Allocation output = Allocation.createTyped(renderScript,input.getType());
// Load up an instance of the specific script that we want to use.
ScriptIntrinsicBlur scriptIntrinsicBlur = ScriptIntrinsicBlur.create(renderScript, Element.U8_4(renderScript));
scriptIntrinsicBlur.setInput(input);
// Set the blur radius
scriptIntrinsicBlur.setRadius(radius);
// Start the ScriptIntrinisicBlur
scriptIntrinsicBlur.forEach(output);
// Copy the output to the blurred bitmap
output.copyTo(inputBmp);
renderScript.destroy();
return inputBmp;
}
/**
* Stack Blur v1.0 from
* http://www.quasimondo.com/StackBlurForCanvas/StackBlurDemo.html
* Java Author: Mario Klingemann <mario at quasimondo.com>
* http://incubator.quasimondo.com
*
* created Feburary 29, 2004
* Android port : Yahel Bouaziz <yahel at kayenko.com>
* http://www.kayenko.com
* ported april 5th, 2012
*
* This is a compromise between Gaussian Blur and Box blur
* It creates much better looking blurs than Box Blur, but is
* 7x faster than my Gaussian Blur implementation.
*
* I called it Stack Blur because this describes best how this
* filter works internally: it creates a kind of moving stack
* of colors whilst scanning through the image. Thereby it
* just has to add one new block of color to the right side
* of the stack and remove the leftmost color. The remaining
* colors on the topmost layer of the stack are either added on
* or reduced by one, depending on if they are on the right or
* on the left side of the stack.
*
* If you are using this algorithm in your code please add
* the following line:
* Stack Blur Algorithm by Mario Klingemann <mario@quasimondo.com>
*/
private static Bitmap fastBlur(Bitmap sentBitmap, float scale, int radius) {
int width = Math.round(sentBitmap.getWidth() * scale);
int height = Math.round(sentBitmap.getHeight() * scale);
sentBitmap = Bitmap.createScaledBitmap(sentBitmap, width, height, false);
Bitmap bitmap = sentBitmap.copy(sentBitmap.getConfig(), true);
if (radius < 1) {
return (null);
}
int w = bitmap.getWidth();
int h = bitmap.getHeight();
int[] pix = new int[w * h];
Log.e("pix", w + " " + h + " " + pix.length);
bitmap.getPixels(pix, 0, w, 0, 0, w, h);
int wm = w - 1;
int hm = h - 1;
int wh = w * h;
int div = radius + radius + 1;
int r[] = new int[wh];
int g[] = new int[wh];
int b[] = new int[wh];
int rsum, gsum, bsum, x, y, i, p, yp, yi, yw;
int vmin[] = new int[Math.max(w, h)];
int divsum = (div + 1) >> 1;
divsum *= divsum;
int dv[] = new int[256 * divsum];
for (i = 0; i < 256 * divsum; i++) {
dv[i] = (i / divsum);
}
yw = yi = 0;
int[][] stack = new int[div][3];
int stackpointer;
int stackstart;
int[] sir;
int rbs;
int r1 = radius + 1;
int routsum, goutsum, boutsum;
int rinsum, ginsum, binsum;
for (y = 0; y < h; y++) {
rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
for (i = -radius; i <= radius; i++) {
p = pix[yi + Math.min(wm, Math.max(i, 0))];
sir = stack[i + radius];
sir[0] = (p & 0xff0000) >> 16;
sir[1] = (p & 0x00ff00) >> 8;
sir[2] = (p & 0x0000ff);
rbs = r1 - Math.abs(i);
rsum += sir[0] * rbs;
gsum += sir[1] * rbs;
bsum += sir[2] * rbs;
if (i > 0) {
rinsum += sir[0];
ginsum += sir[1];
binsum += sir[2];
} else {
routsum += sir[0];
goutsum += sir[1];
boutsum += sir[2];
}
}
stackpointer = radius;
for (x = 0; x < w; x++) {
r[yi] = dv[rsum];
g[yi] = dv[gsum];
b[yi] = dv[bsum];
rsum -= routsum;
gsum -= goutsum;
bsum -= boutsum;
stackstart = stackpointer - radius + div;
sir = stack[stackstart % div];
routsum -= sir[0];
goutsum -= sir[1];
boutsum -= sir[2];
if (y == 0) {
vmin[x] = Math.min(x + radius + 1, wm);
}
p = pix[yw + vmin[x]];
sir[0] = (p & 0xff0000) >> 16;
sir[1] = (p & 0x00ff00) >> 8;
sir[2] = (p & 0x0000ff);
rinsum += sir[0];
ginsum += sir[1];
binsum += sir[2];
rsum += rinsum;
gsum += ginsum;
bsum += binsum;
stackpointer = (stackpointer + 1) % div;
sir = stack[(stackpointer) % div];
routsum += sir[0];
goutsum += sir[1];
boutsum += sir[2];
rinsum -= sir[0];
ginsum -= sir[1];
binsum -= sir[2];
yi++;
}
yw += w;
}
for (x = 0; x < w; x++) {
rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
yp = -radius * w;
for (i = -radius; i <= radius; i++) {
yi = Math.max(0, yp) + x;
sir = stack[i + radius];
sir[0] = r[yi];
sir[1] = g[yi];
sir[2] = b[yi];
rbs = r1 - Math.abs(i);
rsum += r[yi] * rbs;
gsum += g[yi] * rbs;
bsum += b[yi] * rbs;
if (i > 0) {
rinsum += sir[0];
ginsum += sir[1];
binsum += sir[2];
} else {
routsum += sir[0];
goutsum += sir[1];
boutsum += sir[2];
}
if (i < hm) {
yp += w;
}
}
yi = x;
stackpointer = radius;
for (y = 0; y < h; y++) {
// Preserve alpha channel: ( 0xff000000 & pix[yi] )
pix[yi] = ( 0xff000000 & pix[yi] ) | ( dv[rsum] << 16 ) | ( dv[gsum] << 8 ) | dv[bsum];
rsum -= routsum;
gsum -= goutsum;
bsum -= boutsum;
stackstart = stackpointer - radius + div;
sir = stack[stackstart % div];
routsum -= sir[0];
goutsum -= sir[1];
boutsum -= sir[2];
if (x == 0) {
vmin[y] = Math.min(y + r1, hm) * w;
}
p = x + vmin[y];
sir[0] = r[p];
sir[1] = g[p];
sir[2] = b[p];
rinsum += sir[0];
ginsum += sir[1];
binsum += sir[2];
rsum += rinsum;
gsum += ginsum;
bsum += binsum;
stackpointer = (stackpointer + 1) % div;
sir = stack[stackpointer];
routsum += sir[0];
goutsum += sir[1];
boutsum += sir[2];
rinsum -= sir[0];
ginsum -= sir[1];
binsum -= sir[2];
yi += w;
}
}
Log.e("pix", w + " " + h + " " + pix.length);
bitmap.setPixels(pix, 0, w, 0, 0, w, h);
return (bitmap);
}
}
//使用方法
Drawable oldbg = RL_main.getBackground();//获得背景图片
// 将Drawable,转成Bitmap
Bitmap bitmap = ((BitmapDrawable) oldbg).getBitmap();
Bitmap finalBitmap = com.example.administrator.text2.util.EasyBlur.with(MainActivity.this)
.bitmap(bitmap) //要模糊的图片
.radius(8)//模糊半径
.scale(4)//指定模糊前缩小的倍数
.policy(com.example.administrator.text2.util.EasyBlur.BlurPolicy.RS_BLUR)//使用fastBlur
.blur();
//在bulid.gradle（Module：app）下添加兼容包
android {
......
defaultConfig {
......
//使用renderscript 兼容包
renderscriptTargetApi 25
renderscriptSupportModeEnabled true
}
}