LOMO特效

public class LomoFilter {  
    public static Bitmap filter(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;    
                  
                //==========邊緣黑暗==============//  
                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);  
                }  
                //==========邊緣黑暗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;  
    }  
}  

安卓上實現LOMO特效的程式碼