Right now you have to create a Color object to extract the R, G, B or A component of an RGBA32 value.
Created attachment 61585 [details] Proposed patch Add functions: {red,green,blue,alpha}Channel(RGBA32)
Comment on attachment 61585 [details] Proposed patch Clearing flags on attachment: 61585 Committed r63382: <http://trac.webkit.org/changeset/63382>
All reviewed patches have been landed. Closing bug.