OESetSurfaceColor

bool OESetSurfaceColor(OESurface& surf, float r, float g, float b,
                       float a = 1.0f)
bool OESetSurfaceColor(OESurface& surf, unsigned char r,
                       unsigned char g, unsigned char b,
                       unsigned char a = 255)

Sets the color of the entire surface to the specified color.