read
Reads the fragment color at a screen point in the currently active OpenGL frame buffer. The X and Y components indicate OpenGL screen coordinates, which originate in the frame buffer's lower left corner.
Return
the result argument set to the fragment color, or a new color if the result is null
Parameters
x
the screen point's X component
y
the screen point's Y component
result
an optional pre-allocated Color in which to return the fragment color, or null to return a new color