WLXPipetran.dll

Source	src/WLXPipetran/
CMake target	WLXPipetran
Type	Win32 DLL
Family	Pipeline & effects targets

At a glance

"Pipetran" = pipeline transformations: the library of video transitions and effects — the visual grammar of Movie Maker. The header carries 92 RTTI classes for transition/effect animations, including exotic wipes:

• StarWipeTransition, BowTieWipeTransition, ClockWipeTransition, PixelateTransition, and 88 more.

Of these, 22 are stub implementations — faithfully reproducing the original binary, which shipped these classes without full implementations (Quirk #18).

Public surface

From WLXPipetran.def:

GetTFXCreateFunctions @1

The "TFX" (transitions/effects) factory returns the versioned create-function table, the same table pattern as WLXPipeline.

How transitions render

Templates in MovieMakerCore's StoryboardManager reference effects; at render time the effect resolves to a transition animation from this library, which programs a PatternMesh in HMREngine (the wipe/reveal geometry):

Implementation notes

• The DEFINE_STUB_TRANSITION macro family wires the 22 stub animations. Historical bug: the macro originally glued an L##stringId prefix onto string IDs — removed during reconstruction (Gotcha #19 in ROADMAP.md).
• Stub transitions return inert-but-valid behavior (identity/passthrough), never crash — matching the original binary's shipped-but-unimplemented surfaces.

Testing

• Contract coverage for the TFX factory in tests/mmr-python.
• Exercise app: apps/transition-plugin (submodule).

Analysis artifacts

analysis/WLXPipetran/.