Xfermode只作用于一角，求指教

ゞ浴缸里的玫瑰 2022-07-11 12:07 132阅读 0赞

根据徐宜生在大神在慕课网上视频敲出的代码，效果与大神不一样，明明四个圆角，运行出来却只有一个。很郁闷。。。以下是代码，求路过大神指教！  
![这里写图片描述][SouthEast]

package com.interjoy.demoguagualka.CustomView;
    
    
    import android.content.Context;
    import android.graphics.Bitmap;
    import android.graphics.BitmapFactory;
    import android.graphics.Canvas;
    import android.graphics.Paint;
    import android.graphics.PorterDuff;
    import android.graphics.PorterDuffXfermode;
    import android.graphics.RectF;
    import android.util.AttributeSet;
    import android.view.View;
    
    import com.interjoy.demoguagualka.R;
    
    /** * Created by ylwang on 2017/1/23. */
    public class FailView extends View { 
        private Bitmap mBitmap;//从资源文件中获取图片
        private Bitmap mOut;//真正输出显示的图片，android中原始资源图片是不支持修改的
        private Paint mPaint;
    
        public FailView(Context context) {
            super(context);
    // this(context, null);
            initView();
        }
    
        public FailView(Context context, AttributeSet attrs) {
            super(context, attrs);
    // this(context, attrs, 0);
            initView();
        }
    
        public FailView(Context context, AttributeSet attrs, int defStyleAttr) {
            super(context, attrs, defStyleAttr);
            initView();
        }
    
        private void initView() {
            setLayerType(LAYER_TYPE_SOFTWARE, null);//关闭硬件加速，Xfermode部分属性不支持硬件加速
            mBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.forest);//获取资源图片
            mOut = Bitmap.createBitmap(mBitmap.getWidth(), mBitmap.getHeight(),
                    Bitmap.Config.ARGB_8888);//通常都设置最高8888，或者与原图相同mBitmap.getConfig()
            Canvas canvas = new Canvas(mOut);//获取画布对象，以输出图片为画布底版
            mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);//获取画笔对象，抗锯齿效果
            //Android默认先画上去为Dst,然后Xfermode，最后Src
            //Dst
            canvas.drawRoundRect(new RectF(0, 0, mBitmap.getWidth(), mBitmap.getHeight()), 100, 100, mPaint);
            mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
            //Src
            canvas.drawBitmap(mBitmap, 0, 0, mPaint);
            mPaint.setXfermode(null);
        }
    
        @Override
        protected void onDraw(Canvas canvas) {
            super.onDraw(canvas);
            canvas.drawBitmap(mOut, 0, 0, null);
        }
    }

[SouthEast]: /images/20220711/8a0430eac5794aa58ceb60ac92417c2e.png