高斯模糊和贝塞尔曲线

1.高斯模糊

public void getBlur(){

long startMs = System.currentTimeMillis();

Bitmap bitmap = ((BitmapDrawable)(iv.getBackground())).getBitmap();

RenderScript script = RenderScript.create(getContext());

Allocation allocation = Allocation.createFromBitmap(script,bitmap);

ScriptIntrinsicBlur blur = ScriptIntrinsicBlur.create(script,allocation.getElement());

blur.setInput(allocation);

for (int i=0;i<4;i++){

blur.setRadius(25);

blur.forEach(allocation);

}

allocation.copyTo(bitmap);

blur.destroy();

allocation.destroy();

script.destroy();

Log.e("TAG","getBlur: "+(System.currentTimeMillis()-startMs));

iv.setBackground(new BitmapDrawable(getResources(),bitmap));

}

高斯模糊前 高斯模糊后

2.贝塞尔曲线

package ccav.xulingyun.com.testdagger2.view;

import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.LinearGradient;

import android.graphics.Paint;

import android.graphics.Point;

import android.graphics.PorterDuff;

import android.graphics.PorterDuffXfermode;

import android.graphics.Shader;

import android.support.annotation.Nullable;

import android.util.AttributeSet;

import android.view.View;

import ccav.xulingyun.com.testdagger2.R;

/**

* Created by Cantaloupe--郓 on 2018/1/9.

* 描述：

*/

public class HalfCircleViewextends View {

PaintmHalfCirclePaint;

int mWidth;

int mHeight;

int mRadius;

PointmCenterPoint;

BitmapmBitmap;

LinearGradientmLinearGradient;

private PorterDuffXfermodemPorterDuffXfermode;

public HalfCircleView(Context context) {

this(context,null);

}

public HalfCircleView(Context context,@Nullable AttributeSet attrs) {

this(context, attrs,0);

}

public HalfCircleView(Context context,@Nullable AttributeSet attrs,int defStyleAttr) {

super(context, attrs, defStyleAttr);

init();

}

private void init() {

mHalfCirclePaint =new Paint();

mHalfCirclePaint.setAntiAlias(true);

mHalfCirclePaint.setStyle(Paint.Style.FILL);

mHalfCirclePaint.setColor(Color.YELLOW);

mCenterPoint =new Point();

mBitmap = BitmapFactory.decodeResource(getResources(),R.drawable.bikaqiu);

mLinearGradient =new LinearGradient(mWidth/2,0,mWidth/2,mHeight,Color.CYAN,Color.GRAY, Shader.TileMode.MIRROR);

}

@Override

    protected void onSizeChanged(int w,int h,int oldw,int oldh) {

super.onSizeChanged(w, h, oldw, oldh);

mWidth = getWidth();

mHeight = getHeight();

mRadius = (int) (mWidth*1.5);

mCenterPoint.x =mWidth/2;

mCenterPoint.y =mHeight-mRadius;

mPorterDuffXfermode =new PorterDuffXfermode(PorterDuff.Mode.SRC_IN);

}

@Override

    protected void onDraw(Canvas canvas) {

int layerId = canvas.saveLayer(0,0,mWidth,mHeight,null, Canvas.ALL_SAVE_FLAG);

canvas.drawCircle(mCenterPoint.x,mCenterPoint.y,mRadius,mHalfCirclePaint);

mHalfCirclePaint.setXfermode(mPorterDuffXfermode);

canvas.drawBitmap(mBitmap,0,0,mHalfCirclePaint);

mHalfCirclePaint.setXfermode(null);

canvas.restoreToCount(layerId);

}

}