tests/HwAccelerationTest/src/com/android/test/hwui/XfermodeActivity.java

/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.test.hwui;

import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.os.Bundle;
import android.view.View;

import static android.graphics.PorterDuff.Mode;

@SuppressWarnings({"UnusedDeclaration"})
public class XfermodeActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        setContentView(new XfermodesView(this));
    }

    static class XfermodesView extends View {
        private final Paint mBluePaint;
        private final Paint mRedPaint;

        XfermodesView(Context c) {
            super(c);

            mBluePaint = new Paint();
            mBluePaint.setColor(0xff0000ff);
            
            mRedPaint = new Paint();
            mRedPaint.setColor(0x7fff0000);
        }

        @Override
        protected void onDraw(Canvas canvas) {
            super.onDraw(canvas);
            //canvas.drawRGB(255, 255, 255);

            canvas.translate(100.0f, 100.0f);
            
            // SRC modes
            canvas.save();

            drawRects(canvas, Mode.SRC_OVER);
            canvas.translate(0.0f, 100.0f);

            drawRects(canvas, Mode.SRC_IN);
            canvas.translate(0.0f, 100.0f);            

            drawRects(canvas, Mode.SRC_OUT);
            canvas.translate(0.0f, 100.0f);

            drawRects(canvas, Mode.SRC_ATOP);
            canvas.translate(0.0f, 100.0f);
            
            drawRects(canvas, Mode.SRC);

            canvas.restore();
            
            canvas.translate(100.0f, 0.0f);
            
            // DST modes
            canvas.save();

            drawRects(canvas, Mode.DST_OVER);
            canvas.translate(0.0f, 100.0f);

            drawRects(canvas, Mode.DST_IN);
            canvas.translate(0.0f, 100.0f);            

            drawRects(canvas, Mode.DST_OUT);
            canvas.translate(0.0f, 100.0f);

            drawRects(canvas, Mode.DST_ATOP);
            canvas.translate(0.0f, 100.0f);
            
            drawRects(canvas, Mode.DST);

            canvas.restore();
            
            canvas.translate(100.0f, 0.0f);
            
            // Other modes
            canvas.save();

            drawRects(canvas, Mode.CLEAR);
            canvas.translate(0.0f, 100.0f);

            drawRects(canvas, Mode.XOR);
            
            canvas.translate(0.0f, 100.0f);
            
            mBluePaint.setAlpha(127);
            canvas.drawRect(0.0f, 0.0f, 50.0f, 50.0f, mBluePaint);
            
            canvas.translate(0.0f, 100.0f);
            
            mBluePaint.setAlpha(10);
            mBluePaint.setColor(0x7f0000ff);
            canvas.drawRect(0.0f, 0.0f, 50.0f, 50.0f, mBluePaint);
            
            mBluePaint.setColor(0xff0000ff);
            mBluePaint.setAlpha(255);

            canvas.restore();
        }

        private void drawRects(Canvas canvas, PorterDuff.Mode mode) {
            canvas.drawRect(0.0f, 0.0f, 50.0f, 50.0f, mBluePaint);

            canvas.save();
            canvas.translate(25.0f, 25.0f);
            mRedPaint.setXfermode(new PorterDuffXfermode(mode));
            canvas.drawRect(0.0f, 0.0f, 50.0f, 50.0f, mRedPaint);
            canvas.restore();
        }
    }
}