PorterDuffXfermode之PorterDuff.Mode.SRC_IN
package com.loaderman.customviewdemo.view; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Matrix; 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.loaderman.customviewdemo.R; public class InvertedImageView_SRCIN extends View { private Paint mBitPaint; private Bitmap BmpDST, BmpSRC, BmpRevert; public InvertedImageView_SRCIN(Context context, AttributeSet attrs) { super(context, attrs); setLayerType(View.LAYER_TYPE_SOFTWARE, null); mBitPaint = new Paint(); BmpDST = BitmapFactory.decodeResource(getResources(), R.drawable.dog_invert_shade, null); BmpSRC = BitmapFactory.decodeResource(getResources(), R.drawable.dog, null); Matrix matrix = new Matrix(); matrix.setScale(1F, -1F); // 生成倒影图 BmpRevert = Bitmap.createBitmap(BmpSRC, 0, 0, BmpSRC.getWidth(), BmpSRC.getHeight(), matrix, true); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); int width = getWidth() * 2 / 3; int height = width * BmpDST.getHeight() / BmpDST.getWidth(); //先画出小狗图片 canvas.drawBitmap(BmpSRC, null, new RectF(0, 0, width, height), mBitPaint); //再画出倒影 canvas.save(); canvas.translate(0, height); canvas.drawBitmap(BmpDST, null, new RectF(0, 0, width, height), mBitPaint); mBitPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)); canvas.drawBitmap(BmpRevert, null, new RectF(0, 0, width, height), mBitPaint); mBitPaint.setXfermode(null); canvas.restore(); } }
<com.loaderman.customviewdemo.view.InvertedImageView_SRCIN android:layout_width="match_parent" android:layout_height="match_parent" />
效果:
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