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/*
* Copyright (C) 2014 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.example.android.basicrenderscript;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.support.v8.renderscript.*;
public class MainActivity extends Activity {
/* Number of bitmaps that is used for renderScript thread and UI thread synchronization.
Ideally, this can be reduced to 2, however in some devices, 2 buffers still showing tierings on UI.
Investigating a root cause.
*/
private final int NUM_BITMAPS = 3;
private int mCurrentBitmap = 0;
private Bitmap mBitmapIn;
private Bitmap[] mBitmapsOut;
private ImageView mImageView;
private RenderScript mRS;
private Allocation mInAllocation;
private Allocation[] mOutAllocations;
private ScriptC_saturation mScript;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_layout);
/*
* Initialize UI
*/
mBitmapIn = loadBitmap(R.drawable.data);
mBitmapsOut = new Bitmap[NUM_BITMAPS];
for (int i = 0; i < NUM_BITMAPS; ++i) {
mBitmapsOut[i] = Bitmap.createBitmap(mBitmapIn.getWidth(),
mBitmapIn.getHeight(), mBitmapIn.getConfig());
}
mImageView = (ImageView) findViewById(R.id.imageView);
mImageView.setImageBitmap(mBitmapsOut[mCurrentBitmap]);
mCurrentBitmap += (mCurrentBitmap + 1) % NUM_BITMAPS;
SeekBar seekbar = (SeekBar) findViewById(R.id.seekBar1);
seekbar.setProgress(50);
seekbar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
float max = 2.0f;
float min = 0.0f;
float f = (float) ((max - min) * (progress / 100.0) + min);
updateImage(f);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
/*
* Create renderScript
*/
createScript();
/*
* Invoke renderScript kernel and update imageView
*/
updateImage(1.0f);
}
/*
* Initialize RenderScript
* In the sample, it creates RenderScript kernel that performs saturation manipulation.
*/
private void createScript() {
//Initialize RS
mRS = RenderScript.create(this);
//Allocate buffers
mInAllocation = Allocation.createFromBitmap(mRS, mBitmapIn);
mOutAllocations = new Allocation[NUM_BITMAPS];
for (int i = 0; i < NUM_BITMAPS; ++i) {
mOutAllocations[i] = Allocation.createFromBitmap(mRS, mBitmapsOut[i]);
}
//Load script
mScript = new ScriptC_saturation(mRS);
}
/*
* In the AsyncTask, it invokes RenderScript intrinsics to do a filtering.
* After the filtering is done, an operation blocks at Allication.copyTo() in AsyncTask thread.
* Once all operation is finished at onPostExecute() in UI thread, it can invalidate and update ImageView UI.
*/
private class RenderScriptTask extends AsyncTask<Float, Integer, Integer> {
Boolean issued = false;
protected Integer doInBackground(Float... values) {
int index = -1;
if (isCancelled() == false) {
issued = true;
index = mCurrentBitmap;
/*
* Set global variable in RS
*/
mScript.set_saturationValue(values[0]);
/*
* Invoke saturation filter kernel
*/
mScript.forEach_saturation(mInAllocation, mOutAllocations[index]);
/*
* Copy to bitmap and invalidate image view
*/
mOutAllocations[index].copyTo(mBitmapsOut[index]);
mCurrentBitmap = (mCurrentBitmap + 1) % NUM_BITMAPS;
}
return index;
}
void updateView(Integer result) {
if (result != -1) {
// Request UI update
mImageView.setImageBitmap(mBitmapsOut[result]);
mImageView.invalidate();
}
}
protected void onPostExecute(Integer result) {
updateView(result);
}
protected void onCancelled(Integer result) {
if (issued) {
updateView(result);
}
}
}
RenderScriptTask currentTask = null;
/*
Invoke AsynchTask and cancel previous task.
When AsyncTasks are piled up (typically in slow device with heavy kernel),
Only the latest (and already started) task invokes RenderScript operation.
*/
private void updateImage(final float f) {
if (currentTask != null)
currentTask.cancel(false);
currentTask = new RenderScriptTask();
currentTask.execute(f);
}
/*
Helper to load Bitmap from resource
*/
private Bitmap loadBitmap(int resource) {
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
return BitmapFactory.decodeResource(getResources(), resource, options);
}
}
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