`ApplyKhmerReorder`

Signature

function ApplyKhmerReorder(const Wide: UnicodeString): UnicodeString;

Purpose

Applies the Khmer reorder pre-pass to Wide and returns a UnicodeString prepared for cmap and GSUB consumption. Text outside Khmer remains byte-stable, so callers can route mixed text without changing unrelated runs

Coverage

Khmer uses the khmr script record for U+1780-U+17FF. The documented path covers independent South-East Asian syllable processing while preserving API behaviour for producer-side shaping
ApplyIndicReorder dispatches to this helper when the active codepoint range matches U+1780-U+17FF

Example

var
  Wide: UnicodeString;
begin
  // Input: KA (U+1780) + E-vowel (U+17C1, pre-base)
  Wide:= Doc.ApplyKhmerReorder(#$1780#$17C1);
  // Wide is now: E (U+17C1) + KA (U+1780)

  // Input: KA + COENG + KHA + AA-vowel (stacked consonant + post vowel)
  Wide:= Doc.ApplyKhmerReorder(#$1780#$17D2#$1781#$17B6);
  // Wide unchanged: KA + COENG + KHA + AA
  //   (COENG cluster stays in BaseBuf in original order; AA in PostBuf)
end;

Standards

Unicode 16.0 U+1780-U+17FF
ISO 32000-1 §9.10
OpenType Khmer shaping specification

Version history

v2.120.9 - Introduced as part of the HotPDF Indic shaping batch

ApplyKhmerReorder