TFontCache

TFontCache dramatically improves text rendering performance over directly accessing TFontReader objects. Font files only need to be parsed once for each character accessed, and the glyph data returned is cached for later reuse.

const
  text = 'some text';
var
  image       : TImage32;
  rec         : TRect;
  arialReader  : TFontReader;
  arial14Cache: TFontCache;
begin
  ... 
  //The following line of code assumes compiling to the Windows platform.
  //For cross-platform applications, consider storing the font in the
  //application's resource section, and loading it from there.
  arialReader := TFontReader.Create('Arial'); 
  //create a font cache for arialReader (with font height 14)
  arial14Cache := TFontCache.Create(arialReader, DpiAware(14));
  try
    //now do something with arial14Cache
    DrawText(image, rec, text, taCenter, tvaMiddle, arial14Cache);
  finally
    //clean up
    arialReader.Free;
    arial14Cache.Free;
  end;

Reference

Methods	Properties
Clear	Ascent
Create	Descent
Destroy	FontHeight
GetAngledTextGlyphs	FontReader
GetCharInfo	InvertY
GetCharOffsets	Kerning
GetTextCodePoints	LineHeight
GetTextOutline	Scale
GetTextWidth	StrikeOut
GetUnderlineOutline	Underlined