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Android example source code file (ImageProcessingActivity.java)

This example Android source code file (ImageProcessingActivity.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" TM.

Java - Android tags/keywords

allocation, android, bitmap, canvas, drawing, fieldcanbelocal, filtercallback, imageview, inpixel, override, paint, params, pixel, render, renderscript, runnable, suppresswarnings, surfaceview, type, ui

The ImageProcessingActivity.java Android example source code

/*
 * Copyright (C) 2009 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.rs.image;

import android.app.Activity;
import android.os.Bundle;
import android.graphics.BitmapFactory;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.renderscript.ScriptC;
import android.renderscript.RenderScript;
import android.renderscript.Type;
import android.renderscript.Allocation;
import android.renderscript.Element;
import android.renderscript.Script;
import android.view.SurfaceView;
import android.view.SurfaceHolder;
import android.widget.ImageView;
import android.widget.SeekBar;
import java.lang.Math;

public class ImageProcessingActivity extends Activity implements SurfaceHolder.Callback {
    private Bitmap mBitmap;
    private Params mParams;
    private Script.Invokable mInvokable;
    private int[] mInData;
    private int[] mOutData;

    @SuppressWarnings({"FieldCanBeLocal"})
    private RenderScript mRS;
    @SuppressWarnings({"FieldCanBeLocal"})
    private Type mParamsType;
    @SuppressWarnings({"FieldCanBeLocal"})
    private Allocation mParamsAllocation;
    @SuppressWarnings({"FieldCanBeLocal"})
    private Type mPixelType;
    @SuppressWarnings({"FieldCanBeLocal"})
    private Allocation mInPixelsAllocation;
    @SuppressWarnings({"FieldCanBeLocal"})
    private Allocation mOutPixelsAllocation;

    private SurfaceView mSurfaceView;
    private ImageView mDisplayView;

    static class Params {
        public int inWidth;
        public int outWidth;
        public int inHeight;
        public int outHeight;

        public float threshold;
    }

    static class Pixel {
        public byte a;
        public byte r;
        public byte g;
        public byte b;
    }

    class FilterCallback extends RenderScript.RSMessage {
        private Runnable mAction = new Runnable() {
            public void run() {
                mOutPixelsAllocation.readData(mOutData);
                mBitmap.setPixels(mOutData, 0, mParams.outWidth, 0, 0,
                        mParams.outWidth, mParams.outHeight);
                mDisplayView.invalidate();
            }
        };

        @Override
        public void run() {
            mSurfaceView.removeCallbacks(mAction);
            mSurfaceView.post(mAction);
        }
    }

    private void javaFilter() {
        long t = java.lang.System.currentTimeMillis();
        int count = mParams.inWidth * mParams.inHeight;
        float threshold = mParams.threshold * 255.f;

        for (int i = 0; i < count; i++) {
            final float r = (float)((mInData[i] >> 0) & 0xff);
            final float g = (float)((mInData[i] >> 8) & 0xff);
            final float b = (float)((mInData[i] >> 16) & 0xff);

            final float luminance = 0.2125f * r +
                              0.7154f * g +
                              0.0721f * b;
            if (luminance > threshold) {
                mOutData[i] = mInData[i];
            } else {
                mOutData[i] = mInData[i] & 0xff000000;
            }
        }

        t = java.lang.System.currentTimeMillis() - t;

        android.util.Log.v("Img", "frame time ms " + t);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        mBitmap = loadBitmap(R.drawable.data);

        mSurfaceView = (SurfaceView) findViewById(R.id.surface);
        mSurfaceView.getHolder().addCallback(this);

        mDisplayView = (ImageView) findViewById(R.id.display);
        mDisplayView.setImageBitmap(mBitmap);

        ((SeekBar) findViewById(R.id.threshold)).setOnSeekBarChangeListener(
                new SeekBar.OnSeekBarChangeListener() {
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                if (fromUser) {
                    mParams.threshold = progress / 100.0f;
                    mParamsAllocation.data(mParams);

                    if (true) {
                        mInvokable.execute();
                    } else {
                        javaFilter();
                        mBitmap.setPixels(mOutData, 0, mParams.outWidth, 0, 0,
                                mParams.outWidth, mParams.outHeight);
                        mDisplayView.invalidate();
                    }
                }
            }

            public void onStartTrackingTouch(SeekBar seekBar) {
            }

            public void onStopTrackingTouch(SeekBar seekBar) {
            }
        });
    }

    public void surfaceCreated(SurfaceHolder holder) {
        mParams = createParams();
        mInvokable = createScript();

        mInvokable.execute();
    }

    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
    }

    public void surfaceDestroyed(SurfaceHolder holder) {
    }

    private Script.Invokable createScript() {
        mRS = RenderScript.create();
        mRS.mMessageCallback = new FilterCallback();

        mParamsType = Type.createFromClass(mRS, Params.class, 1, "Parameters");
        mParamsAllocation = Allocation.createTyped(mRS, mParamsType);
        mParamsAllocation.data(mParams);

        final int pixelCount = mParams.inWidth * mParams.inHeight;

        mPixelType = Type.createFromClass(mRS, Pixel.class, 1, "Pixel");
        mInPixelsAllocation = Allocation.createSized(mRS,
                Element.createUser(mRS, Element.DataType.SIGNED_32),
                pixelCount);
        mOutPixelsAllocation = Allocation.createSized(mRS,
                Element.createUser(mRS, Element.DataType.SIGNED_32),
                pixelCount);

        mInData = new int[pixelCount];
        mBitmap.getPixels(mInData, 0, mParams.inWidth, 0, 0, mParams.inWidth, mParams.inHeight);
        mInPixelsAllocation.data(mInData);

        mOutData = new int[pixelCount];
        mOutPixelsAllocation.data(mOutData);

        ScriptC.Builder sb = new ScriptC.Builder(mRS);
        sb.setType(mParamsType, "Params", 0);
        sb.setType(mPixelType, "InPixel", 1);
        sb.setType(mPixelType, "OutPixel", 2);
        sb.setType(true, 2);
        Script.Invokable invokable = sb.addInvokable("main");
        sb.setScript(getResources(), R.raw.threshold);
        //sb.setRoot(true);

        ScriptC script = sb.create();
        script.bindAllocation(mParamsAllocation, 0);
        script.bindAllocation(mInPixelsAllocation, 1);
        script.bindAllocation(mOutPixelsAllocation, 2);

        return invokable;
    }

    private Params createParams() {
        final Params params = new Params();
        params.inWidth = params.outWidth = mBitmap.getWidth();
        params.inHeight = params.outHeight = mBitmap.getHeight();
        params.threshold = 0.5f;
        return params;
    }

    private Bitmap loadBitmap(int resource) {
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inPreferredConfig = Bitmap.Config.ARGB_8888;
        return copyBitmap(BitmapFactory.decodeResource(getResources(), resource, options));
    }

    private static Bitmap copyBitmap(Bitmap source) {
        Bitmap b = Bitmap.createBitmap(source.getWidth(), source.getHeight(), source.getConfig());
        Canvas c = new Canvas(b);
        c.drawBitmap(source, 0, 0, null);
        source.recycle();
        return b;
    }
}

Other Android examples (source code examples)

Here is a short list of links related to this Android ImageProcessingActivity.java source code file:

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