package com.example;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.renderscript.Allocation;
import android.renderscript.RenderScript;
import android.renderscript.ScriptIntrinsicBlur;
import android.util.TimingLogger;
import android.view.View;
import android.view.ViewTreeObserver;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.view.ViewTreeObserver.OnPreDrawListener;
import android.widget.ImageView;
import android.widget.TextView;
public class FastBlurActivity extends Activity {
private static final String TAG = "Blurring";
private ImageView mImage;
private TextView mText;
private OnPreDrawListener mPreDrawListener = new OnPreDrawListener() {
@Override
public boolean onPreDraw() {
ViewTreeObserver observer = mText.getViewTreeObserver();
if(observer != null) {
observer.removeOnPreDrawListener(this);
}
Drawable drawable = mImage.getDrawable();
if (drawable != null && drawable instanceof BitmapDrawable) {
Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();
if (bitmap != null) {
//blur(bitmap, mText, 25);
blurJava(bitmap, mText, 25);
}
}
return true;
}
};
private OnGlobalLayoutListener mLayoutListener = new OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
ViewTreeObserver observer = mText.getViewTreeObserver();
if(observer != null) {
observer.addOnPreDrawListener(mPreDrawListener);
}
}
};
/**
* Called when the activity is first created.
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mImage = (ImageView) findViewById(R.id.image);
mText = (TextView)findViewById(R.id.text);
if (mImage != null && mText != null) {
ViewTreeObserver observer = mText.getViewTreeObserver();
if (observer != null) {
observer.addOnGlobalLayoutListener(
mLayoutListener);
}
}
mText.setText("Blur in Java!");
}
private void blur(Bitmap bkg, View view, float radius) {
TimingLogger tl = new TimingLogger(TAG, "blur");
Bitmap overlay = Bitmap.createBitmap(view.getMeasuredWidth(), view.getMeasuredHeight(), Bitmap.Config.ARGB_8888);
tl.addSplit("Bitmap.createBitmap()");
Canvas canvas = new Canvas(overlay);
tl.addSplit("new Canvas()");
canvas.drawBitmap(bkg, -view.getLeft(), -view.getTop(), null);
tl.addSplit("canvas.drawBitmap()");
RenderScript rs = RenderScript.create(this);
tl.addSplit("RenderScript.create()");
Allocation overlayAlloc = Allocation.createFromBitmap(rs, overlay);
tl.addSplit("Allocation.createFromBitmap()");
ScriptIntrinsicBlur blur = ScriptIntrinsicBlur.create(rs, overlayAlloc.getElement());
tl.addSplit("ScriptIntrinsicBlur.create()");
blur.setInput(overlayAlloc);
tl.addSplit("blur.setInput()");
blur.setRadius(radius);
tl.addSplit("blur.setRadius()");
blur.forEach(overlayAlloc);
tl.addSplit("blur.forEach()");
overlayAlloc.copyTo(overlay);
tl.addSplit("overlayAlloc.copyTo()");
view.setBackground(new BitmapDrawable(getResources(), overlay));
tl.addSplit("view.setBackground()");
rs.destroy();
tl.addSplit("rs.destroy()");
tl.dumpToLog();
}
private void blurJava(Bitmap bkg, View view, int radius) {
TimingLogger tl = new TimingLogger(TAG, "blur");
Bitmap overlay = Bitmap.createBitmap(view.getMeasuredWidth(), view.getMeasuredHeight(), Bitmap.Config.ARGB_8888);
tl.addSplit("Bitmap.createBitmap()");
Canvas canvas = new Canvas(overlay);
tl.addSplit("new Canvas()");
canvas.drawBitmap(bkg, -view.getLeft(), -view.getTop(), null);
tl.addSplit("canvas.drawBitmap()");
Bitmap blurred = fastblur(overlay, radius);
tl.addSplit("fastblur()");
view.setBackground(new BitmapDrawable(getResources(), blurred));
tl.addSplit("view.setBackground()");
tl.dumpToLog();
}
/*
* This method was copied from http://stackoverflow.com/a/10028267/694378.
* The only modifications I've made are to remove a couple of Log
* statements which could slow things down slightly.
*/
public Bitmap fastblur(Bitmap sentBitmap, int radius) {
// Stack Blur v1.0 from
// http://www.quasimondo.com/StackBlurForCanvas/StackBlurDemo.html
//
// Java Author: Mario Klingemann <mario at quasimondo.com>
// http://incubator.quasimondo.com
// created Feburary 29, 2004
// Android port : Yahel Bouaziz <yahel at kayenko.com>
// http://www.kayenko.com
// ported april 5th, 2012
// This is a compromise between Gaussian Blur and Box blur
// It creates much better looking blurs than Box Blur, but is
// 7x faster than my Gaussian Blur implementation.
//
// I called it Stack Blur because this describes best how this
// filter works internally: it creates a kind of moving stack
// of colors whilst scanning through the image. Thereby it
// just has to add one new block of color to the right side
// of the stack and remove the leftmost color. The remaining
// colors on the topmost layer of the stack are either added on
// or reduced by one, depending on if they are on the right or
// on the left side of the stack.
//
// If you are using this algorithm in your code please add
// the following line:
//
// Stack Blur Algorithm by Mario Klingemann <mario@quasimondo.com>
Bitmap bitmap = sentBitmap.copy(sentBitmap.getConfig(), true);
if (radius < 1) {
return (null);
}
int w = bitmap.getWidth();
int h = bitmap.getHeight();
int[] pix = new int[w * h];
bitmap.getPixels(pix, 0, w, 0, 0, w, h);
int wm = w - 1;
int hm = h - 1;
int wh = w * h;
int div = radius + radius + 1;
int r[] = new int[wh];
int g[] = new int[wh];
int b[] = new int[wh];
int rsum, gsum, bsum, x, y, i, p, yp, yi, yw;
int vmin[] = new int[Math.max(w, h)];
int divsum = (div + 1) >> 1;
divsum *= divsum;
int dv[] = new int[256 * divsum];
for (i = 0; i < 256 * divsum; i++) {
dv[i] = (i / divsum);
}
yw = yi = 0;
int[][] stack = new int[div][3];
int stackpointer;
int stackstart;
int[] sir;
int rbs;
int r1 = radius + 1;
int routsum, goutsum, boutsum;
int rinsum, ginsum, binsum;
for (y = 0; y < h; y++) {
rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
for (i = -radius; i <= radius; i++) {
p = pix[yi + Math.min(wm, Math.max(i, 0))];
sir = stack[i + radius];
sir[0] = (p & 0xff0000) >> 16;
sir[1] = (p & 0x00ff00) >> 8;
sir[2] = (p & 0x0000ff);
rbs = r1 - Math.abs(i);
rsum += sir[0] * rbs;
gsum += sir[1] * rbs;
bsum += sir[2] * rbs;
if (i > 0) {
rinsum += sir[0];
ginsum += sir[1];
binsum += sir[2];
} else {
routsum += sir[0];
goutsum += sir[1];
boutsum += sir[2];
}
}
stackpointer = radius;
for (x = 0; x < w; x++) {
r[yi] = dv[rsum];
g[yi] = dv[gsum];
b[yi] = dv[bsum];
rsum -= routsum;
gsum -= goutsum;
bsum -= boutsum;
stackstart = stackpointer - radius + div;
sir = stack[stackstart % div];
routsum -= sir[0];
goutsum -= sir[1];
boutsum -= sir[2];
if (y == 0) {
vmin[x] = Math.min(x + radius + 1, wm);
}
p = pix[yw + vmin[x]];
sir[0] = (p & 0xff0000) >> 16;
sir[1] = (p & 0x00ff00) >> 8;
sir[2] = (p & 0x0000ff);
rinsum += sir[0];
ginsum += sir[1];
binsum += sir[2];
rsum += rinsum;
gsum += ginsum;
bsum += binsum;
stackpointer = (stackpointer + 1) % div;
sir = stack[(stackpointer) % div];
routsum += sir[0];
goutsum += sir[1];
boutsum += sir[2];
rinsum -= sir[0];
ginsum -= sir[1];
binsum -= sir[2];
yi++;
}
yw += w;
}
for (x = 0; x < w; x++) {
rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
yp = -radius * w;
for (i = -radius; i <= radius; i++) {
yi = Math.max(0, yp) + x;
sir = stack[i + radius];
sir[0] = r[yi];
sir[1] = g[yi];
sir[2] = b[yi];
rbs = r1 - Math.abs(i);
rsum += r[yi] * rbs;
gsum += g[yi] * rbs;
bsum += b[yi] * rbs;
if (i > 0) {
rinsum += sir[0];
ginsum += sir[1];
binsum += sir[2];
} else {
routsum += sir[0];
goutsum += sir[1];
boutsum += sir[2];
}
if (i < hm) {
yp += w;
}
}
yi = x;
stackpointer = radius;
for (y = 0; y < h; y++) {
// Preserve alpha channel: ( 0xff000000 & pix[yi] )
pix[yi] = ( 0xff000000 & pix[yi] ) | ( dv[rsum] << 16 ) | ( dv[gsum] << 8 ) | dv[bsum];
rsum -= routsum;
gsum -= goutsum;
bsum -= boutsum;
stackstart = stackpointer - radius + div;
sir = stack[stackstart % div];
routsum -= sir[0];
goutsum -= sir[1];
boutsum -= sir[2];
if (x == 0) {
vmin[y] = Math.min(y + r1, hm) * w;
}
p = x + vmin[y];
sir[0] = r[p];
sir[1] = g[p];
sir[2] = b[p];
rinsum += sir[0];
ginsum += sir[1];
binsum += sir[2];
rsum += rinsum;
gsum += ginsum;
bsum += binsum;
stackpointer = (stackpointer + 1) % div;
sir = stack[stackpointer];
routsum += sir[0];
goutsum += sir[1];
boutsum += sir[2];
rinsum -= sir[0];
ginsum -= sir[1];
binsum -= sir[2];
yi += w;
}
}
bitmap.setPixels(pix, 0, w, 0, 0, w, h);
return (bitmap);
}
}