package com.example.androidimageview;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.renderscript.Allocation;
import android.renderscript.Element;
import android.renderscript.RenderScript;
import android.renderscript.ScriptIntrinsicConvolve3x3;
import android.support.v7.app.ActionBarActivity;
import android.widget.ImageView;
public class MainActivity extends ActionBarActivity {
ImageView imageA1, imageA2, imageB1, imageB2, imageC1, imageC2;
Bitmap bitmapOriginal, bitmapBlur, bitmapSharpen;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageA1 = (ImageView) findViewById(R.id.imagea1);
imageA2 = (ImageView) findViewById(R.id.imagea2);
imageB1 = (ImageView) findViewById(R.id.imageb1);
imageB2 = (ImageView) findViewById(R.id.imageb2);
imageC1 = (ImageView) findViewById(R.id.imagec1);
imageC2 = (ImageView) findViewById(R.id.imagec2);
bitmapOriginal = BitmapFactory.decodeResource(getResources(),
R.drawable.ic_launcher);
imageA1.setImageBitmap(bitmapOriginal);
imageA2.setImageBitmap(bitmapOriginal);
// create sharpen bitmap from blur bitmap
bitmapSharpen = createBitmap_convolve(bitmapOriginal, matrix_sharpen);
imageB1.setImageBitmap(bitmapSharpen);
imageB2.setImageBitmap(bitmapSharpen);
// create blur bitmap from original bitmap
bitmapBlur = createBitmap_convolve(bitmapOriginal, matrix_blur);
imageC1.setImageBitmap(bitmapBlur);
imageC2.setImageBitmap(bitmapBlur);
}
float[] matrix_blur =
{ 1.0f/9.0f, 1.0f/9.0f, 1.0f/9.0f,
1.0f/9.0f, 1.0f/9.0f, 1.0f/9.0f,
1.0f/9.0f, 1.0f/9.0f, 1.0f/9.0f};
float[] matrix_sharpen =
{ 0, -1, 0,
-1, 5, -1,
0, -1, 0};
private Bitmap createBitmap_convolve(Bitmap src, float[] coefficients) {
Bitmap result = Bitmap.createBitmap(src.getWidth(),
src.getHeight(), src.getConfig());
RenderScript renderScript = RenderScript.create(this);
Allocation input = Allocation.createFromBitmap(renderScript, src);
Allocation output = Allocation.createFromBitmap(renderScript, result);
ScriptIntrinsicConvolve3x3 convolution = ScriptIntrinsicConvolve3x3
.create(renderScript, Element.U8_4(renderScript));
convolution.setInput(input);
convolution.setCoefficients(coefficients);
convolution.forEach(output);
output.copyTo(result);
renderScript.destroy();
return result;
}
}
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.androidimageview.MainActivity" >
<TextView
android:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:autoLink="web"
android:text="http://android-er.blogspot.com/"
android:textStyle="bold" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="vertical" >
<ImageView
android:id="@+id/imagea1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<ImageView
android:id="@+id/imagea2"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="vertical" >
<ImageView
android:id="@+id/imageb1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<ImageView
android:id="@+id/imageb2"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="vertical" >
<ImageView
android:id="@+id/imagec1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<ImageView
android:id="@+id/imagec2"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
Next:
- interactive exercise of ScriptIntrinsicConvolve3x3
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