Android advanced Blur technology for how to achieve the effect of frosted glass

Since the iOS system introduced the Blur effect, that is, the so-called frosted glass, blur effect, matte effect, the big system began to race to imitate, this is how a effect, we first look at, such as the following picture:

Effect we know, how to implement in Android, the White is the image of the blur, the small part of the first to tell you the Android Advanced fuzzy Technology Principles, as follows:

• First I created an empty bitmap, copied a portion of the background, and I then obfuscated the bitmap and set it to TextView background.

• Save the state of the canvas through this bitmap;

• Move the canvas to the TextView location in the parent layout file;

• Draw the contents of the ImageView into the bitmap;

• At this point, we have a bitmap of the same size as TextView, which contains part of the ImageView, which is the content of the layout behind the TextView;

• Create an instance of Renderscript;

• Copy the bitmap into the data sheet required by the Renderscript;

• Create an instance of Renderscript obfuscation;

• Set the input, radius range and then blur the process;

• Copy the processed results back to the previous bitmap;

• Well, we have already awakened bitmap to blur, and can set it to TextView background;

I recently made an app, which has a function need to image processing to achieve the effect of the glass, after some research, found in 3 implementations, each with advantages and disadvantages, if the system's API in more than 16, you can use the system provides methods to directly process the picture, But the small part thinks the solution below is the best way to achieve the results.

The code is as follows:

Public Bitmap Fastblur (context context, Bitmap sentbitmap, int radius) {Bitmap Bitmap = sentbitmap.copy (Sentbitmap.getcon Fig (), 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); in T 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 temp = divsum;int dv[] = new Int[temp];for (i = 0; i < temp; i++) {Dv[i] = (i/d Ivsum);} yw = Yi = 0;int[][] stack = new Int[div][3];int stackpointer;int stackstart;int[] sir;int rbs;int r1 = radius + 1;int rout Sum, 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 + = s IR[2];}} Stackpointer = radius;for (x = 0; x < W; + +) {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];goutsu M-= 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 & 0x0 000FF); Rinsum + = Sir[0];ginsum + sir[1];binsum + = sir[2];rsum + rinsum;gsum + ginsum;bsum + = Binsum;stackpointer = (STA Ckpointer + 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++) {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);}

The code implements the following:

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Android advanced Blur technology for how to achieve the effect of frosted glass