Real plugins (CImg ChromaKeyerOFX, AddOFX) failed the render action with
kOfxStatFailed / MissingHostFeature and painted the magenta failure frame:
- images lacked the mandatory ImageBase properties (OfxPropType,
PixelAspectRatio, PreMultiplication, Field, RenderScale); the ofxs
ImageBase constructor throws on the missing/invalid strong reads
- PreMultiplication used the made-up string "OfxImagePreMultiplied";
kOfxImagePreMultiplied is actually "OfxImageAlphaPremultiplied", the
only value mapStrToPreMultiplicationEnum accepts (lldb __cxa_throw
backtrace pinpointed this)
- RenderWindow is Int x4 per ofxsPropertyValidation, not Double x4
- field strings use the real constant "OfxFieldNone"
- clips define OfxImageClipPropConnected (isConnected is a strong read;
optional mask clips blew up without it)
- choice params predefine empty ChoiceEnum / ChoiceLabelOption arrays
- isIdentity failure is no longer fatal (the C++ plugin renderer never
calls it; plugins that error on it simply render normally)
- property suite coerces Int <-> Double on reads (the CImg framework
reads the render window with propGetIntN against a Double store)
- in-args carry NatronOfxPropNativeOverlays=0 for the Natron framework
- plugin jobs pass a GL-kind marker so GL-only plugins take the real
gl_bridge offscreen path instead of the CPU MissingHostFeature path
- trace-gated [ofx] diagnostics for property misses and suite calls
Verified with new smoke tests that render the real AddOFX and
ChromaKeyerOFX plugins through the executor and assert the output is
not the purple failure frame.