Sets the icon for the display window. Win32 icons must be 32x32.
This function must be called before the first call to +SDL_SetVideoMode.
The mask is a bitmask that describes the shape of the +icon. If mask is NULL, then the shape is determined by +the colorkey of icon, if any, or makes the icon +rectangular (no transparency) otherwise.
If mask is non-NULL, it points to a bitmap with bits set +where the corresponding pixel should be visible. The format of the bitmap is as +follows: Scanlines come in the usual top-down order. Each scanline consists of +(width / 8) bytes, rounded up. The most significant bit of each byte represents +the leftmost pixel.