先上效果图：
动态调节高斯模糊
模糊dialog
相机弹框实时高斯模糊
原理：
在我们洗澡的时候，透过厕所雾蒙蒙的玻璃看过去，是不是很漂亮。这就是现实中的毛玻璃效果。原理很简单，你把眼镜儿取了，你看到到处都是高斯模糊。就是做算法，将原本清晰的图像加入放大镜，让你的眼镜不能聚焦。
做法原理：
将每一个正在处理的像素，取周围若干个像素的RGB值的平均数，来作为该点的RGB。用正太分布函数，越靠近中心，计算的权重越大，处理强度越大。
正太分布图
实现高斯模糊的途径：
- RenderScript
- Java算法
- NDK算法
- openGL
Java实现的高斯模糊
通过设置模糊半径得到一个RGB矩阵，每个color分别右移24,16,8位按位与0xff,然后截取低8位，分别计算平均值。
public class BlurImageView {
/**
* 水平方向模糊度
*/
private static float hRadius = 8;
/**
* 竖直方向模糊度
*/
private static float vRadius = 8;
/**
* 模糊迭代度
*/
private static int iterations = 8;
/**
* 图片高斯模糊处理 �
*/
public static Bitmap BlurImages(Bitmap bmp) {
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);
return bitmap;
}
/**
* 图片高斯模糊算法�
*/
public 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;
}
}
/**
* 图片高斯模糊算法 �
*/
public 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;
}
}
RenderScript算法
详情见我另一篇博客：(http://www.jianshu.com/p/bc5df96c8e4f)
引入方式：
defaultConfig {
applicationId "com.example.renderscript.renderscriptuse"
minSdkVersion 17
targetSdkVersion 26
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
renderscriptTargetApi 18
renderscriptSupportModeEnabled true
}
调用方法：
public static Bitmap handleGlassblur(Context context,Bitmap originBitmap,int radius){
RenderScript renderScript = RenderScript.create(context);
Allocation input = Allocation.createFromBitmap(renderScript,originBitmap);
Allocation output = Allocation.createTyped(renderScript,input.getType());
ScriptIntrinsicBlur scriptIntrinsicBlur = ScriptIntrinsicBlur.create(renderScript, Element.U8_4(renderScript));
scriptIntrinsicBlur.setRadius(radius);
scriptIntrinsicBlur.setInput(input);
scriptIntrinsicBlur.forEach(output);
output.copyTo(originBitmap);
return originBitmap;
}
功能1：动态调节高斯模糊
private void init() {
imageView = (ImageView) findViewById(R.id.imageview);
seekBar = (SeekBar) findViewById(R.id.seekbar);
seekBar.setMax(25);
seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.mipmap.test10);
if(progress < 1){
progress = 1;
}
Bitmap blurBitmap = RenderScriptGlassBlur.handleGlassblur(getApplicationContext(),bitmap,progress);
imageView.setImageBitmap(blurBitmap);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {}
});
}
因为该方法模糊范围是1-25，所以seekbar范围也控制在1-25；
功能2：全屏高斯模糊dialog
- 将activity的上层decorview通过getDrawingCache()获取bitmap，创建dialog，将bitmap传递给dialog作为dialog的全屏背景；
public void dialog(View view){
View rootView = getWindow().getDecorView();
rootView.setDrawingCacheEnabled(true);
rootView.buildDrawingCache();
Bitmap mBitmap = rootView.getDrawingCache();
new BlurDialog(this,mBitmap);
}
2.在dialog中调用RenderScriptGlassBlur.bitmapBlur(context,ivBg,bitmap,3)将传递过来的背景图进行高斯模糊，所以才能得到下层activity的样子。实际上就是在dialog下层加了一层activity显示图片。
public class BlurDialog {
private Dialog dialog;
private ImageView ivBg;
public BlurDialog(Context context,Bitmap bitmap){
dialog = new Dialog(context, R.style.BottomDialog);
dialog.setContentView(R.layout.dialog_bgblur);
dialog.show();
ivBg = dialog.findViewById(R.id.imageview_bg);
fullScreen();
RenderScriptGlassBlur.bitmapBlur(context,ivBg,bitmap,3);
}
private void fullScreen(){
//dialog全屏设置
WindowManager.LayoutParams layoutParams = dialog.getWindow().getAttributes();
layoutParams.gravity= Gravity.BOTTOM;
layoutParams.width= WindowManager.LayoutParams.MATCH_PARENT;
layoutParams.height= WindowManager.LayoutParams.MATCH_PARENT;
dialog.getWindow().getDecorView().setPadding(0, 0, 0, 0);
dialog.getWindow().setAttributes(layoutParams);
}
}
dialog全屏style设置
<style name="BottomDialog" parent="@android:style/Theme.NoTitleBar.Fullscreen">
<item name="android:windowNoTitle">true</item>
<item name="android:windowBackground">@color/transparent</item>
<!-- 是否有边框 -->
<item name="android:windowFrame">@null</item>
<!--是否在悬浮Activity之上 -->
<item name="android:windowIsFloating">true</item>
</style>
dialog的xml布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/imageview_bg"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<android.support.v7.widget.CardView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
app:cardElevation="0dp"
app:cardCornerRadius="5dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#000"
android:textSize="16sp"
android:padding="12dp"
android:background="#fff"
android:text="我是网红程熙媛"/>
<ImageView
android:layout_width="270dp"
android:layout_height="400dp"
android:background="@mipmap/test10"
android:scaleType="centerCrop"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#fff"
android:padding="10dp">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@mipmap/attention_btn_good"
android:layout_marginRight="20dp"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@mipmap/find_btn_comment"
android:layout_marginRight="20dp"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@mipmap/dynamic_more"
android:layout_marginRight="20dp"/>
</LinearLayout>
</LinearLayout>
</android.support.v7.widget.CardView>
</RelativeLayout>
功能3：在摄像头上调用diaolog，实时高斯模糊
handler.sendEmptyMessageDelayed(0,40);用handler每过40毫秒发送命令，从相机显示view中获取一帧bitmap进行高斯模糊，每秒就会有25帧图切换。25帧/s的图片播放就会是连续的视频。但是需要在dialog的
setOnDismissListener中调用handler.removeCallbacksAndMessages(null)停止截取帧
public class CameraSetupDialog {
private Dialog dialog;
private Context context;
private RadioGroup rgSpeed,rgFocus,rgSkin,rgDelay;
private ImageView ivBg;
private View viewClose;
private Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
RenderScriptGlassBlur.bitmapBlur(context,ivBg, DialogBgActivity.textureView.getBitmap(),8);
handler.sendEmptyMessageDelayed(0,40);
}
};
public CameraSetupDialog(Context context) {
this.context = context;
dialog = new Dialog(context, R.style.BottomDialog);
dialog.setContentView(R.layout.camera_setup);
dialog.show();
initView();
init();
event();
}
private void initView() {
rgSpeed = dialog.findViewById(R.id.rg_camera_speed);
rgFocus = dialog.findViewById(R.id.rg_camera_focus);
rgSkin = dialog.findViewById(R.id.rg_camera_skin);
rgDelay = dialog.findViewById(R.id.rg_camera_delay);
viewClose = dialog.findViewById(R.id.view_close);
ivBg = dialog.findViewById(R.id.iv_bg);
dialog.setCanceledOnTouchOutside(true);
((RadioButton)rgSpeed.getChildAt(0)).setChecked(true);
((RadioButton)rgFocus.getChildAt(0)).setChecked(true);
((RadioButton)rgSkin.getChildAt(0)).setChecked(true);
((RadioButton)rgDelay.getChildAt(0)).setChecked(true);
handler.sendEmptyMessageDelayed(0,40);
}
private void event(){
dialog.setOnDismissListener(new DialogInterface.OnDismissListener() {
@Override
public void onDismiss(DialogInterface dialog) {
handler.removeCallbacksAndMessages(null);
}
});
}
private void init() {
//显示对话框时，后面的Activity不变暗，可选操作。
Window win = dialog.getWindow();
win.clearFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND);
//对话框全屏
WindowManager windowManager = dialog.getWindow().getWindowManager();
Display display = windowManager.getDefaultDisplay();
WindowManager.LayoutParams lp = dialog.getWindow().getAttributes();
lp.width = display.getWidth(); //设置宽度
lp.height = display.getHeight();
dialog.getWindow().setAttributes(lp);
}
}
好了，还有什么思维不连贯的，有疑惑的就在github上下载demo来看吧。
