pdfIsLinearized

int32_t __stdcall pdfIsLinearized(PPDF IPDF);

function pdfIsLinearized(const IPDF: PPDF): Integer; stdcall;

Purpose. Report whether the document is linearized ("fast web view").

Description. Known limitation: this engine never produces linearized output, so this always returns 0 for any valid document handle — per an explicit source comment: "LumasPDF never linearizes its output, so an authored doc is always 0. (import-side /Linearized detection is a documented follow-up.)" — meaning even a linearized *imported* PDF is not detected as such through this call either, pending that follow-up.

Return value. 0 for any valid, currently-open document (never linearized, and import-side detection is not yet implemented); -1 if IPDF is invalid.

C# (P/Invoke)

public static extern int pdfIsLinearized(IntPtr IPDF);