Return early from EffectTransform methods if no effect bits are set

[adroitwhiz]

Proposed Changes

This PR changes EffectTransform's transformColor and transformPoint methods to check if any effect bits are set, and if not, return their inputs before doing anything else (e.g. getting uniforms, copying the input to the output).

Reason for Changes

These functions are called inside tight loops, and optimizing them in this way appears to yield a ~25-30% performance improvement on "touching color" checks, according to this benchmark:

Current	This PR

[thisandagain]

/cc @cwillisf @kchadha @BryceLTaylor @mzgoddard

[mzgoddard]

We need to move the if test and return an initialized dst but otherwise this looks good to me.

[adroitwhiz]

@mzgoddard Good catch!

[adroitwhiz]

Closing this PR in favor of a better one