Android 马赛克(Mosaics)效果

public static Bitmap getMosaicsBitmap(Bitmap bmp, double precent) {
long start = System.currentTimeMillis();
int bmpW = bmp.getWidth();
int bmpH = bmp.getHeight();
Bitmap resultBmp = Bitmap.createBitmap(bmpW, bmpH, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(resultBmp);
Paint paint = new Paint();
double unit;
if (precent == 0) {
 unit = bmpW;
} else {
 unit = 1 / precent;
}
double resultBmpW = bmpW / unit;
double resultBmpH = bmpH / unit;
for (int i = 0; i < resultBmpH; i++) {
 for (int j = 0; j < resultBmpW; j++) {
 int pickPointX = (int) (unit * (j + 0.5));
 int pickPointY = (int) (unit * (i + 0.5));
 int color;
 if (pickPointX >= bmpW || pickPointY >= bmpH) {
  color = bmp.getPixel(bmpW / 2, bmpH / 2);
 } else {
  color = bmp.getPixel(pickPointX, pickPointY);
 }
 paint.setColor(color);
 canvas.drawRect((int) (unit * j), (int) (unit * i), (int) (unit * (j + 1)), (int) (unit * (i + 1)), paint);
 }
}
canvas.setBitmap(null);
long end = System.currentTimeMillis();
Log.v(TAG, "DrawTime:" + (end - start));
return resultBmp;
}

 public static Bitmap getMosaicsBitmaps(Bitmap bmp, double precent) {
 long start = System.currentTimeMillis();
 int bmpW = bmp.getWidth();
 int bmpH = bmp.getHeight();
 int[] pixels = new int[bmpH * bmpW];
 bmp.getPixels(pixels, 0, bmpW, 0, 0, bmpW, bmpH);
 int raw = (int) (bmpW * precent);
 int unit;
 if (raw == 0) {
 unit = bmpW;
 } else {
 unit = bmpW / raw; //原来的unit*unit像素点合成一个，使用原左上角的值
 }
 if (unit >= bmpW || unit >= bmpH) {
 return getMosaicsBitmap(bmp, precent);
 }
 for (int i = 0; i < bmpH; ) {
 for (int j = 0; j < bmpW; ) {
  int leftTopPoint = i * bmpW + j;
  for (int k = 0; k < unit; k++) {
  for (int m = 0; m < unit; m++) {
   int point = (i + k) * bmpW + (j + m);
   if (point < pixels.length) {
   pixels[point] = pixels[leftTopPoint];
   }
  }
  }
  j += unit;
 }
 i += unit;
 }
 long end = System.currentTimeMillis();
 Log.v(TAG, "DrawTime:" + (end - start));
 return Bitmap.createBitmap(pixels, bmpW, bmpH, Bitmap.Config.ARGB_8888);
}