THPDFCacheLayerKind Type
Identifies the internal cache layer an admission policy or statistics query applies to
Declaration
THPDFCacheLayerKind= (clkRawCompressed, clkDecoded,
clkDisplayList, clkRaster);Unit
HPDFDoc
Values
| Value | Meaning |
|---|---|
clkRawCompressed | Coalescing cache over the raw document bytes of the loaded source, used while reading the file |
clkDecoded | Sharded cache of decoded image and stream data |
clkDisplayList | Cache of compiled page display lists |
clkRaster | Cache of rendered page rasters |
Usage notes
- Pass a value of this type to THotPDF.SetCacheAdmissionPolicy, GetCacheAdmissionPolicy, and GetCacheAdmissionStatistics to configure or read one layer independently of the others
- Each layer keeps its own THPDFCacheAdmissionPolicy record (enabled flag, adaptive admission, entry and byte budgets); THotPDF.ResetCacheAdmissionPolicies restores the built-in defaults
- Admission decisions feed frequency sketches per layer, so the raster and display-list layers can evict rarely reused pages first