pdfSetUseTransparency

BOOL32 __stdcall pdfGetDocUsesTransparency(PPDF IPDF, uint32_t Flags);
BOOL32 __stdcall pdfGetUseTransparency(PPDF IPDF);
BOOL32 __stdcall pdfSetUseTransparency(PPDF IPDF, BOOL32 Value);

function pdfGetDocUsesTransparency(const IPDF: PPDF; Flags: Cardinal): LongBool; stdcall;
function pdfGetUseTransparency(const IPDF: PPDF): LongBool; stdcall;
function pdfSetUseTransparency(const IPDF: PPDF; Value: LongBool): LongBool; stdcall;

Purpose. Get/set a document-level "uses transparency" flag consulted when deciding whether to emit PDF-1.4+ transparency-group constructs.

Description. Verified: pdfGetDocUsesTransparency and pdfGetUseTransparency are the literal identical implementation (GetUseTransparency) — despite the different name suggesting a document-content scan ("does this document actually use transparency anywhere"), pdfGetDocUsesTransparency is simply the same stored flag getter with an extra, silently dropped Flags parameter (accepted by the ABI but never consulted).

Parameters.

Return value. True/False per the stored flag; False if IPDF is invalid.

C# (P/Invoke)

[return: MarshalAs(UnmanagedType.Bool)]