羽化效果

// 羽化效果
public static Bitmap changeToEclosion(Bitmap bitmap) {
int width = bitmap.getWidth();
int height = bitmap.getHeight();
int dst[] = new int[width * height];
bitmap.getPixels(dst, 0, width, 0, 0, width, height);

int ratio = width > height ? height*32768/width : width*32768/height;

int cx = width >> 1;
int cy = height >> 1;
int max = cx * cx + cy * cy;
int min = (int) (max * (1 - 0.5f));
int diff = max - min;

int R, G, B;
int pos, pixColor;
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
pos = y * width + x;
pixColor = dst[pos];
R = Color.red(pixColor);
G = Color.green(pixColor);
B = Color.blue(pixColor);

int dx = cx - x;
int dy = cy - y;
if (width > height) {
dx = (dx * ratio) >> 15;
} else {
dy = (dy * ratio) >> 15;
}

int distSq = dx * dx + dy * dy;
float v = ((float) distSq / diff) * 255;
R = (int) (R + (v));
G = (int) (G + (v));
B = (int) (B + (v));
R = (R > 255 ? 255 : (R < 0 ? 0 : R));
G = (G > 255 ? 255 : (G < 0 ? 0 : G));
B = (B > 255 ? 255 : (B < 0 ? 0 : B));

dst[pos] = Color.rgb(R, G, B);
}
}
Bitmap processBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
processBitmap.setPixels(dst, 0, width, 0, 0, width, height);
return processBitmap;
}