モザイク（陰影）

基本的にはモザイク処理ですが、モザイク範囲の端部分に線を引いてデコボコ感やタイル感を強調しています。

  private Bitmap effectPixelizationShadow( Bitmap bitmap, int margin ){

    if( bitmap == null ){
      bitmap = BitmapFactory.decodeResource( getResources( ), R.drawable.original ).copy( Bitmap.Config.ARGB_8888, true );
    }

    if( bitmap == null ){
      return bitmap;
    }

    if( bitmap.isMutable( ) != true ){
      bitmap = bitmap.copy( Bitmap.Config.ARGB_8888, true );
    }

    int height   = bitmap.getHeight( );
    int width    = bitmap.getWidth( );
    int[] pixels = new int[( width * height )];
    bitmap.getPixels( pixels, 0, width, 0, 0, width, height );

    int i, j, ii, jj;
    int size = 10;

    for( i = 0; i < width; i += size ){
      for( j = 0; j < height; j += size ){

        int r, rr, g, gg , b, bb, counts;
        r = rr = g = gg = b = bb = counts = 0;

        for( ii = 0; ii < size; ++ii ){
          for( jj = 0; jj < size; ++jj ){

            if( ( i + ii ) < 0 || width  <= ( i + ii ) ||
                ( j + jj ) < 0 || height <= ( j + jj ) ){
              continue;
            }

            int bitmapColor = pixels[( ( i + ii ) + ( j + jj ) * width )];

            rr = Color.red( bitmapColor );
            gg = Color.green( bitmapColor );
            bb = Color.blue( bitmapColor );

            r += rr;
            g += gg;
            b += bb;

            counts++;
          }
        }

        rr = r / counts;
        gg = g / counts;
        bb = b / counts;

        for( ii = 0; ii < size; ++ii ){
          for( jj = 0; jj < size; ++jj ){

            if( ( i + ii ) < 0 || width  <= ( i + ii ) ||
                ( j + jj ) < 0 || height <= ( j + jj ) ){
              continue;
            }

            if( ( margin <= jj && ( ii + 1 ) == size ) ||
                ( margin <= ii && ( jj + 1 ) == size ) ){
              pixels[( ( i + ii ) + ( j + jj ) * width )] = Color.rgb( 0, 0, 0 );
            } else {
              pixels[( ( i + ii ) + ( j + jj ) * width )] = Color.rgb( rr, gg, bb );
            }
          }
        }
      }
    }

    bitmap.setPixels( pixels, 0, width, 0, 0, width, height );

    return bitmap;
  }

オリジナル：

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