lesstagcpu.dll — LessTag CPU backend (Windows x64)

Pure-CPU LessTag detector. It links no OpenCL, so it runs on machines with no GPU and no OpenCL runtime installed — the case where cllesstag.dll cannot even be loaded.

Install

Drop lesstagcpu.dll next to DetourLite.exe (or Detour.exe).

Selecting it

DetourLite discovers LessTag backends the same way it discovers RegCore backends. Priority, highest first:

1. the detector's own backend setting ("cpu", "cl", or "auto")
2. the legacy clVer = "cpu" setting, kept working for existing configs
3. the DETOUR_LESSTAG environment variable (cpu, cl, comma-separated for a fallback order)
4. discovery order — OpenCL first, CPU as the fallback

So with only this DLL present and backend = "auto", the CPU backend is what you get: the OpenCL backend fails to bind because cllesstag.dll is absent, and resolution falls through.

Aliases accepted anywhere a backend name is taken: cpu, lesstagcpu, lesstag_cpu.

Detection size

The CPU path clamps the detection image to 160 px on the long side (CpuMaxSide). This is applied automatically once the CPU backend is the resolved one — you do not need to change factor yourself.

Verifying it loaded

The console prints the bound backend at startup:

Loaded lesstag backend cpu from DetourCore.LocatorTypes.LessTagController+LessTagCpuLibrary, version=lesstagcpu 1.1.0 (hourglass, ...)

and the detector's status line carries the backend name, e.g. [cpu:HD/cl1.2 160x160 x0.250].

Same detections as the OpenCL DLL

This DLL is built from exactly the same lesstag_cpu.cpp that lives inside cllesstag.dll; splitting it out changed only which library hosts the code. Fed an identical frame, both return byte-identical results — verified against a synthesized tag before publishing.