android 图片模糊化处理

/** 水平方向模糊度 */
 private static float hRadius = 5;
 /** 竖直方向模糊度 */
 private static float vRadius = 5;
 /** 模糊迭代度 */
 private static int iterations =3;

 /**
  * 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[tr] << 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;
 }