Android Bitmap 倒影

public Bitmap invertedImg() {    //1. 倒立图    Matrix matrix = new Matrix();    matrix.preScale(1, -1);    int w = mBitmap.getWidth();    int h = mBitmap.getHeight();    Bitmap reflectionImg = Bitmap.createBitmap(mBitmap, 0, h / 2, w, h / 2, matrix, false);    //2. 要生成原图加倒立图，先生成一个可变的Bitmap，高度为1.5倍原h    int gap = 10; //间隙 空白    Bitmap newBitmap = Bitmap.createBitmap(w, h + h / 2 + gap, Bitmap.Config.ARGB_8888);    Paint paint = new Paint();    Canvas canvas = new Canvas(newBitmap);    canvas.drawBitmap(mBitmap, 0, 0, paint);  //绘制原图    canvas.drawBitmap(reflectionImg, 0, h + gap, paint); //绘制倒立图    //3. 画笔使用 LinearGradient 线性渐变渲染    LinearGradient lg = new LinearGradient(0, h + gap, w, newBitmap.getHeight(), 0xabff0000,            0x00ffff00, Shader.TileMode.MIRROR);    paint.setShader(lg);    //4. 指定画笔的Xfermode  即绘制的模式(不同的模式，绘制的区域不同)    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_ATOP));    //5. 在倒立图区，绘制矩形渲染图层    canvas.drawRect(0, h + gap, w, newBitmap.getHeight(), paint);    paint.setXfermode(null);    return newBitmap;}
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