The OpenVG spec
Version 1.0 - August 1, 2005
Amended January 26, 2007"
reads (page 12: "The vgReadPixels function allows pixel data to be copied ...".
Together with the code sample ("The code ... is equivalent to the code ...", p. 129), where 'data' is not allocated before use, this sentence may be somewhat misleading to the conclusion that it allows direct access to the pixel data. Especially because vgGetPixels is described in active voice: "The vgGetPixels function retrieves pixel data ...". Shouldn't it therefore be "The vgReadPixels function copies pixel data from the drawing surface..."?
vgWritePixels is similar.
Of course it is clear what the function does if one reads the whole description. Sorry for nitpicking but a spec should be as unambiguous as possible, shouldn't it?