View之背景虚化处理(头像作为背景模糊化处理)

public class BlurImageview {
      /** 水平方向模糊度 */
      private static float hRadius = 10;
      /** 竖直方向模糊度 */
      private static float vRadius = 10;
      /** 模糊迭代度 */
      private static int iterations = 10;

      /**
       * 图片高斯模糊处理 
       */
      public static Drawable BlurImages (Bitmap bmp, Context context) {

             int width = bmp.getWidth();
             int height = bmp.getHeight();
             int[] inPixels = new int[width * height];
             int[] outPixels = new int[width * height];
            Bitmap bitmap = Bitmap. createBitmap(width, height,
                        Bitmap.Config. ARGB_8888);
            bmp.getPixels(inPixels, 0, width, 0, 0, width, height);
             for ( int i = 0; i < iterations; i++) {
                   blur(inPixels, outPixels, width, height, hRadius);
                   blur(outPixels, inPixels, height, width, vRadius);
            }
             blurFractional(inPixels, outPixels, width, height, hRadius);
             blurFractional(outPixels, inPixels, height, width, vRadius);
            bitmap.setPixels(inPixels, 0, width, 0, 0, width, height);
            Drawable drawable = new BitmapDrawable(context.getResources(), bitmap);
             return drawable;
      }

      /**
       * 图片高斯模糊算法
       */
      public static void blur(int[] in, int[] out, int width, int height,
                   float radius) {
             int widthMinus1 = width - 1;
             int r = ( int) radius;
             int tableSize = 2 * r + 1;
             int divide[] = new int[256 * tableSize];

             for ( int i = 0; i < 256 * tableSize; i++)
                  divide[i] = i / tableSize;

             int inIndex = 0;

             for ( int y = 0; y < height; y++) {
                   int outIndex = y;
                   int ta = 0, tr = 0, tg = 0, tb = 0;

                   for ( int i = -r; i <= r; i++) {
                         int rgb = in[inIndex + clamp(i, 0, width - 1)];
                        ta += (rgb >> 24) & 0xff;
                        tr += (rgb >> 16) & 0xff;
                        tg += (rgb >> 8) & 0xff;
                        tb += rgb & 0xff;
                  }

                   for ( int x = 0; x < width; x++) {
                        out[outIndex] = (divide[ta] << 24) | (divide<< 16)
                                    | (divide[tg] << 8) | divide[tb];

                         int i1 = x + r + 1;
                         if (i1 > widthMinus1)
                              i1 = widthMinus1;
                         int i2 = x - r;
                         if (i2 < 0)
                              i2 = 0;
                         int rgb1 = in[inIndex + i1];
                         int rgb2 = in[inIndex + i2];

                        ta += ((rgb1 >> 24) & 0xff) - ((rgb2 >> 24) & 0xff);
                        tr += ((rgb1 & 0xff0000) - (rgb2 & 0xff0000)) >> 16;
                        tg += ((rgb1 & 0xff00) - (rgb2 & 0xff00)) >> 8;
                        tb += (rgb1 & 0xff) - (rgb2 & 0xff);
                        outIndex += height;
                  }
                  inIndex += width;
            }
      }

      /**
       * 图片高斯模糊算法 
       */
      public static void blurFractional( int[] in, int[] out, int width,
                   int height, float radius) {
            radius -= ( int) radius;
             float f = 1.0f / (1 + 2 * radius);
             int inIndex = 0;

             for ( int y = 0; y < height; y++) {
                   int outIndex = y;

                  out[outIndex] = in[0];
                  outIndex += height;
                   for ( int x = 1; x < width - 1; x++) {
                         int i = inIndex + x;
                         int rgb1 = in[i - 1];
                         int rgb2 = in[i];
                         int rgb3 = in[i + 1];

                         int a1 = (rgb1 >> 24) & 0xff;
                         int r1 = (rgb1 >> 16) & 0xff;
                         int g1 = (rgb1 >> 8) & 0xff;
                         int b1 = rgb1 & 0xff;
                         int a2 = (rgb2 >> 24) & 0xff;
                         int r2 = (rgb2 >> 16) & 0xff;
                         int g2 = (rgb2 >> 8) & 0xff;
                         int b2 = rgb2 & 0xff;
                         int a3 = (rgb3 >> 24) & 0xff;
                         int r3 = (rgb3 >> 16) & 0xff;
                         int g3 = (rgb3 >> 8) & 0xff;
                         int b3 = rgb3 & 0xff;
                        a1 = a2 + ( int) ((a1 + a3) * radius);
                        r1 = r2 + ( int) ((r1 + r3) * radius);
                        g1 = g2 + ( int) ((g1 + g3) * radius);
                        b1 = b2 + ( int) ((b1 + b3) * radius);
                        a1 *= f;
                        r1 *= f;
                        g1 *= f;
                        b1 *= f;
                        out[outIndex] = (a1 << 24) | (r1 << 16) | (g1 << 8) | b1;
                        outIndex += height;
                  }
                  out[outIndex] = in[width - 1];
                  inIndex += width;
            }
      }

      public static int clamp(int x, int a, int b) {
             return (x < a) ? a : (x > b) ? b : x;
      }

view. setBackgroundDrawable(BlurImageview. BlurImages(bitmap, MainActivity.this ));