Feature/desired premult #57
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Added V2 proposal
Indicates whether an effect should premultiply or not on output. This provides clarification for generators or effect where input is kOfxImageOpaque.
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Currently we have the kOfxImageEffectPropPreMultiplication(a Clip Preferences Action): kOfxImageOpaque, kOfxImagePreMultiplied, kOfxImageUnPreMultiplied
Request is to add additional effect instance clarity for cases where main input clip alpha is kOfxImageOpaque but output is not (e.g. a keyer). We realize some hosts might allow a branch of their processing graph to switch but this is just to set an host level policy that would make most sense to their users or internal processing - typically an host compositing operator is in one state or other by default.
kOfxImageEffectHostDesiredPremult (value can be kOfxImagePreMultiplied or kOfxImageUnPreMultiplied).