//哈哈镜效果
public static Bitmap changeToHaha(Bitmap bitmap){
int centerX = bitmap.getWidth() / 2;
int centerY = bitmap.getHeight() / 2;
float radius = Math.min(centerX*2/3, centerY*2/3);
float mutiple = 2.0f;
return changeToHaha(bitmap, radius, centerX, centerY, mutiple);
}

/**
* @param bitmap 原图bitmap
* @param radius 半径
* @param centerX 圆心x坐标
* @param centerY 圆心y坐标
* @param mutiple 系数
* @return
*/
public static Bitmap changeToHaha(Bitmap bitmap, float radius, int centerX, int centerY, float mutiple){
int width = bitmap.getWidth();
int height = bitmap.getHeight();

int[] src = http://www.mamicode.com/new int[width*height];
int[] dst = new int[width*height];
bitmap.getPixels(src, 0, width, 0, 0, width, height);

int x, y, pos, color;
int R, G, B;
int distance;
int src_x, src_y, src_color;
int real_radius = (int)(radius / mutiple);

for(y=0; y<height; y++){
for(x=0; x<width; x++){
pos = y*width + x;
color = src[pos];

R = Color.red(color);
G = Color.green(color);
B = Color.blue(color);

distance = (centerX-x)*(centerX-x) + (centerY-y)*(centerY-y);
if (distance < radius * radius){
//放大镜效果
//src_x = (int)((float)(x-centerX)/xishu + centerX);
//src_y = (int)((float)(y-centerY)/xishu + centerY);
//哈哈镜效果
src_x = (int)((float)(x-centerX) / mutiple );
src_y = (int)((float)(y-centerY) / mutiple );
src_x = (int)(src_x * (Math.sqrt(distance) / real_radius));
src_y = (int)(src_y * (Math.sqrt(distance) / real_radius));
src_x += centerX;
src_y += centerY;

src_color = src[src_y*width+src_x];
R = Color.red(src_color);
G = Color.green(src_color);
B = Color.blue(src_color);

R = Math.min(255, Math.max(0, R));
G = Math.min(255, Math.max(0, G));
B = Math.min(255, Math.max(0, B));

dst[pos] = Color.rgb(R, G, B);
}
else{
dst[pos] = src[pos];
}

}
}

Bitmap returnBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
returnBitmap.setPixels(dst, 0, width, 0, 0, width, height);
return returnBitmap;
}