LOMO效果

//LOMO效果
public static Bitmap changeToLomo(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 - 0.8f));
int diff = max - min;

int ri, gi, bi;
int dx, dy, distSq, v;

int R, G, B;

int value;
int pos, pixColor;
int newR, newG, newB;
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);

value = R<128 ? R : 256-R;
newR = (value*value*value)/64/256;
newR = (R<128 ? newR : 255-newR);

value = G<128 ? G : 256-G;
newG = (value*value)/128;
newG = (G<128 ? newG : 255-newG);

newB = B/2 + 0x25;

//==========边缘黑暗==============//
dx = cx - x;
dy = cy - y;
if (width > height)
dx = (dx * ratio) >> 15;
else
dy = (dy * ratio) >> 15;

distSq = dx * dx + dy * dy;
if (distSq > min){
v = ((max - distSq) << 8) / diff;
v *= v;

ri = (int)(newR * v) >> 16;
gi = (int)(newG * v) >> 16;
bi = (int)(newB * v) >> 16;

newR = ri > 255 ? 255 : (ri < 0 ? 0 : ri);
newG = gi > 255 ? 255 : (gi < 0 ? 0 : gi);
newB = bi > 255 ? 255 : (bi < 0 ? 0 : bi);
}
//==========边缘黑暗end==============//

dst[pos] = Color.rgb(newR, newG, newB);
}
}

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