| /* |
| * 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); |
| } |
| |
| } |