/*
* 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.renderscriptintrinsic;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.ImageView;
import android.widget.RadioButton;
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 ScriptIntrinsicBlur mScriptBlur;
private ScriptIntrinsicConvolve5x5 mScriptConvolve;
private ScriptIntrinsicColorMatrix mScriptMatrix;
private final int MODE_BLUR = 0;
private final int MODE_CONVOLVE = 1;
private final int MODE_COLORMATRIX = 2;
private int mFilterMode = MODE_BLUR;
private RenderScriptTask mLatestTask = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_layout);
/*
* Initialize UI
*/
//Set up main image view
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;
//Set up seekbar
final SeekBar seekbar = (SeekBar) findViewById(R.id.seekBar1);
seekbar.setProgress(50);
seekbar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
updateImage(progress);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
//Setup effect selector
RadioButton radio0 = (RadioButton) findViewById(R.id.radio0);
radio0.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
mFilterMode = MODE_BLUR;
updateImage(seekbar.getProgress());
}
}
});
RadioButton radio1 = (RadioButton) findViewById(R.id.radio1);
radio1.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
mFilterMode = MODE_CONVOLVE;
updateImage(seekbar.getProgress());
}
}
});
RadioButton radio2 = (RadioButton) findViewById(R.id.radio2);
radio2.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
mFilterMode = MODE_COLORMATRIX;
updateImage(seekbar.getProgress());
}
}
});
/*
* Create renderScript
*/
createScript();
/*
* Create thumbnails
*/
createThumbnail();
/*
* Invoke renderScript kernel and update imageView
*/
mFilterMode = MODE_BLUR;
updateImage(50);
}
private void createScript() {
mRS = RenderScript.create(this);
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]);
}
/*
Create intrinsics.
RenderScript has built-in features such as blur, convolve filter etc.
These intrinsics are handy for specific operations without writing RenderScript kernel.
In the sample, it's creating blur, convolve and matrix intrinsics.
*/
mScriptBlur = ScriptIntrinsicBlur.create(mRS, Element.U8_4(mRS));
mScriptConvolve = ScriptIntrinsicConvolve5x5.create(mRS,
Element.U8_4(mRS));
mScriptMatrix = ScriptIntrinsicColorMatrix.create(mRS,
Element.U8_4(mRS));
}
private void performFilter(Allocation inAllocation,
Allocation outAllocation, Bitmap bitmapOut, float value) {
switch (mFilterMode) {
case MODE_BLUR:
/*
* Set blur kernel size
*/
mScriptBlur.setRadius(value);
/*
* Invoke filter kernel
*/
mScriptBlur.setInput(inAllocation);
mScriptBlur.forEach(outAllocation);
break;
case MODE_CONVOLVE: {
float f1 = value;
float f2 = 1.0f - f1;
// Emboss filter kernel
float coefficients[] = {-f1 * 2, 0, -f1, 0, 0, 0, -f2 * 2, -f2, 0,
0, -f1, -f2, 1, f2, f1, 0, 0, f2, f2 * 2, 0, 0, 0, f1, 0,
f1 * 2,};
/*
* Set kernel parameter
*/
mScriptConvolve.setCoefficients(coefficients);
/*
* Invoke filter kernel
*/
mScriptConvolve.setInput(inAllocation);
mScriptConvolve.forEach(outAllocation);
break;
}
case MODE_COLORMATRIX: {
/*
* Set HUE rotation matrix
* The matrix below performs a combined operation of,
* RGB->HSV transform * HUE rotation * HSV->RGB transform
*/
float cos = (float) Math.cos((double) value);
float sin = (float) Math.sin((double) value);
Matrix3f mat = new Matrix3f();
mat.set(0, 0, (float) (.299 + .701 * cos + .168 * sin));
mat.set(1, 0, (float) (.587 - .587 * cos + .330 * sin));
mat.set(2, 0, (float) (.114 - .114 * cos - .497 * sin));
mat.set(0, 1, (float) (.299 - .299 * cos - .328 * sin));
mat.set(1, 1, (float) (.587 + .413 * cos + .035 * sin));
mat.set(2, 1, (float) (.114 - .114 * cos + .292 * sin));
mat.set(0, 2, (float) (.299 - .3 * cos + 1.25 * sin));
mat.set(1, 2, (float) (.587 - .588 * cos - 1.05 * sin));
mat.set(2, 2, (float) (.114 + .886 * cos - .203 * sin));
mScriptMatrix.setColorMatrix(mat);
/*
* Invoke filter kernel
*/
mScriptMatrix.forEach(inAllocation, outAllocation);
}
break;
}
/*
* Copy to bitmap and invalidate image view
*/
outAllocation.copyTo(bitmapOut);
}
/*
Convert seekBar progress parameter (0-100 in range) to parameter for each intrinsic filter.
(e.g. 1.0-25.0 in Blur filter)
*/
private float getFilterParameter(int i) {
float f = 0.f;
switch (mFilterMode) {
case MODE_BLUR: {
final float max = 25.0f;
final float min = 1.f;
f = (float) ((max - min) * (i / 100.0) + min);
}
break;
case MODE_CONVOLVE: {
final float max = 2.f;
final float min = 0.f;
f = (float) ((max - min) * (i / 100.0) + min);
}
break;
case MODE_COLORMATRIX: {
final float max = (float) Math.PI;
final float min = (float) -Math.PI;
f = (float) ((max - min) * (i / 100.0) + min);
}
break;
}
return f;
}
/*
* 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;
performFilter(mInAllocation, mOutAllocations[index], mBitmapsOut[index], values[0]);
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);
}
}
}
/*
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(int progress) {
float f = getFilterParameter(progress);
if (mLatestTask != null)
mLatestTask.cancel(false);
mLatestTask = new RenderScriptTask();
mLatestTask.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);
}
/*
Create thumbNail for UI. It invokes RenderScript kernel synchronously in UI-thread,
which is OK for small thumbnail (but not ideal).
*/
private void createThumbnail() {
int width = 72;
int height = 96;
float scale = getResources().getDisplayMetrics().density;
int pixelsWidth = (int) (width * scale + 0.5f);
int pixelsHeight = (int) (height * scale + 0.5f);
//Temporary image
Bitmap tempBitmap = Bitmap.createScaledBitmap(mBitmapIn, pixelsWidth, pixelsHeight, false);
Allocation inAllocation = Allocation.createFromBitmap(mRS, tempBitmap);
//Create thumbnail with each RS intrinsic and set it to radio buttons
int[] modes = {MODE_BLUR, MODE_CONVOLVE, MODE_COLORMATRIX};
int[] ids = {R.id.radio0, R.id.radio1, R.id.radio2};
int[] parameter = {50, 100, 25};
for (int mode : modes) {
mFilterMode = mode;
float f = getFilterParameter(parameter[mode]);
Bitmap destBitpmap = Bitmap.createBitmap(tempBitmap.getWidth(),
tempBitmap.getHeight(), tempBitmap.getConfig());
Allocation outAllocation = Allocation.createFromBitmap(mRS, destBitpmap);
performFilter(inAllocation, outAllocation, destBitpmap, f);
ThumbnailRadioButton button = (ThumbnailRadioButton) findViewById(ids[mode]);
button.setThumbnail(destBitpmap);
}
}
}