Mozilla2:GFXTextRun

Class gfxTextRun

gfxTextRun.h

class gfxTextRun {
  // these do not copy the text
  gfxTextRun(const char* ASCII, int length, nsIFontMetrics* font, nsIAtom* language);
  gfxTextRun(const PRUnichar* unicode, int length, nsIFontMetrics* font, nsIAtom* language);

  enum { ClusterStart = 0x1 } CharFlags;
  // ClusterStart: character is the first character of a cluster
  void GetCharacterFlags(int pos, int len, CharFlags* flags);
         
  struct Dimensions {
    gfxFloat ascent, descent, width, leftBearing, rightBearing;
  };
  Dimensions MeasureText(int pos, int len);

  // Compute how many characters from this string starting at
  // character 'pos' and up to length 'len' fit
  // into the given width. 'breakflags' indicates our
  // preferences about where we allow breaks.
  // We will usually want to call MeasureText right afterwards,
  // the implementor could optimize for that.

  int GetCharsFit(int pos, int len, gfxFloat width, int breakflags);

  int GetPositionInString(gfxPoint& pt);
};

See Gecko2:NewTextAPI