android - How to bluring and debluring bitmap on seekbar change -


i developing image processing , want apply blur effect using seekbar. using code below blur bitmap , works want deblur bitmap can not achieve...plz me out problem 

private bitmap blurfast(bitmap bmp, int radius) {       int w = bmp.getwidth();       int h = bmp.getheight();       int[] pix = new int[w * h];       bmp.getpixels(pix, 0, w, 0, 0, w, h);        for(int r = radius; r >= 1; r /= 2)        {           for(int = r; < h - r; i++)           {               for(int j = r; j < w - r; j++)               {                   int tl = pix[(i - r) * w + j - r];                   int tr = pix[(i - r) * w + j + r];                   int tc = pix[(i - r) * w + j];                   int bl = pix[(i + r) * w + j - r];                   int br = pix[(i + r) * w + j + r];                   int bc = pix[(i + r) * w + j];                   int cl = pix[i * w + j - r];                   int cr = pix[i * w + j + r];              pix[(i * w) + j] = 0xff000000 |             (((tl & 0xff) + (tr & 0xff) + (tc & 0xff) + (bl & 0xff) +  (br & 0xff) + (bc & 0xff) + (cl & 0xff) + (cr & 0xff)) >> 3) & 0xff |             (((tl & 0xff00) + (tr & 0xff00) + (tc & 0xff00) + (bl & 0xff00)  +  (br & 0xff00) + (bc & 0xff00) + (cl & 0xff00) + (cr & 0xff00)) >> 3) & 0xff00 |             (((tl & 0xff0000) + (tr & 0xff0000) + (tc & 0xff0000) +  (bl & 0xff0000) + (br & 0xff0000) + (bc & 0xff0000) + (cl & 0xff0000) +  (cr & 0xff0000)) >> 3) & 0xff0000;               }           }       }       bmp.setpixels(pix, 0, w, 0, 0, w, h);       return bmp;     }

you can't "deblur" image once it's blurred. way can achieve keep copy of original , restore when necessary. only way deal blurring blur original image. need reorganise code in following fashion:

private bitmap origbitmap; ...  bitmap bmp = //get starting bitmap here; origbitmap = bitmap.createbitmap(bmp);  ...  seekbar.setonseekbarchangelistener(new onseekbarchangelistener() {     public void onprogresschanged(seekbar seekbar, int progress, boolean fromuser) {         bitmap blurred = blurfast(origbitmap, progress);         //now draw blurred bitmap wherever need     }      public void onstarttrackingtouch(seekbar seekbar) {}     public void onstoptrackingtouch(seekbar seekbar) {} }); ...  private bitmap blurfast(bitmap bmp, int radius) {       int w = bmp.getwidth();       int h = bmp.getheight();       int[] pix = new int[w * h];       bmp.getpixels(pix, 0, w, 0, 0, w, h);        for(int r = radius; r >= 1; r /= 2)        {           for(int = r; < h - r; i++)           {               for(int j = r; j < w - r; j++)               {                   int tl = pix[(i - r) * w + j - r];                   int tr = pix[(i - r) * w + j + r];                   int tc = pix[(i - r) * w + j];                   int bl = pix[(i + r) * w + j - r];                   int br = pix[(i + r) * w + j + r];                   int bc = pix[(i + r) * w + j];                   int cl = pix[i * w + j - r];                   int cr = pix[i * w + j + r];              pix[(i * w) + j] = 0xff000000 |             (((tl & 0xff) + (tr & 0xff) + (tc & 0xff) + (bl & 0xff) +  (br & 0xff) + (bc & 0xff) + (cl & 0xff) + (cr & 0xff)) >> 3) & 0xff |             (((tl & 0xff00) + (tr & 0xff00) + (tc & 0xff00) + (bl & 0xff00)  +  (br & 0xff00) + (bc & 0xff00) + (cl & 0xff00) + (cr & 0xff00)) >> 3) & 0xff00 |             (((tl & 0xff0000) + (tr & 0xff0000) + (tc & 0xff0000) +  (bl & 0xff0000) + (br & 0xff0000) + (bc & 0xff0000) + (cl & 0xff0000) +  (cr & 0xff0000)) >> 3) & 0xff0000;               }           }       }       bitmap blurred = bitmap.createbitmap(w, h, bmp.getconfig);       blurred.setpixels(pix, 0, w, 0, 0, w, h);       return blurred;     }

a few things note:

  1. in beginning declaring private member variable of type bitmap, hold original bitmap, before blurring has been applied.

  2. whenever seekbar moves, apply blur original bitmap, not current state of bitmap.

  3. in blurfast method, need create new bitmap blurred pixels rather updating 1 passed (notice last 3 lines in code).

  4. lastly, keep in mind if bitmaps large, may run out of memory, keep close eye on memory usage.

i haven't tested code can't guarantee need, should started.


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