- for( GlyphIndex index = 0u; !matched && ( index < numberOfCharactersInLigature ); ++index )
- {
- // Find the mid-point of the area containing the glyph
- const float glyphCenter = -glyphMetrics.xBearing + position.x + ( static_cast<float>( index ) + 0.5f ) * glyphAdvance;
+ // Get the position of the first glyph.
+ const Vector2& position = *( positionsBuffer + firstLogicalGlyphIndex );
+
+ // Whether the glyph can be split, like Latin ligatures fi, ff or Arabic ﻻ.
+ const bool isInterglyphIndex = ( numberOfCharacters > numberOfGlyphs ) && HasLigatureMustBreak( script );
+ const Length numberOfBlocks = isInterglyphIndex ? numberOfCharacters : 1u;
+ const float glyphAdvance = glyphMetrics.advance / static_cast<float>( numberOfBlocks );
+
+ GlyphIndex index = 0u;
+ for( ; !matched && ( index < numberOfBlocks ); ++index )
+ {
+ // Find the mid-point of the area containing the glyph
+ const float glyphCenter = -glyphMetrics.xBearing + position.x + ( static_cast<float>( index ) + 0.5f ) * glyphAdvance;