flipping pixels something something for ian

ian.cs

// oldArray         newArray
//  0,1,2            6,7,8  
//  3,4,5     -->    3,4,5
//  6,7,8            0,1,2

int x = width;              // known size
int size = width * width;   // always a square
int[] newArray = new int[size];

for (int i = 0; i < width; i++) {
    for (int j = 0; j < width; j++) {
        int oldArrayPos = size - width * (i + 1);
        newArray[i * width + j] = oldArray[oldArrayPos + j];
    }
}