[OpenJDK 2D-Dev] [8] request for review: 7181199: [macosx] Startup is much slower in headless mode for apps using Fonts

[Andrew Brygin]

Hello Phil, and Jennifer,

  could you please review a fix for 7181199?

  The observed difference in the consumed time is caused by
  SunFontManager::loadFonts(): in case of headless, it takes
  much more time to complete. In fact all this time is spent
  in registerFontsOnPath() (about 4000ms in headless mode
  instead of 0ms in normal mode).

  This method takes significant time in headless mode, just
  because it handles font path "/Library/Fonts" which was
  returned by getPlatformFontPath(), whereas  in case of
  normal mode, the returned font path is empty.

  The method  getPlatformFontPath() delegates actual work to
  getFontDirs() which is overloaded in CFontManager. In case
  of CFontManager, this delegate checks whether default toolkit
  is an instance of LWCToolkit, and returns empty path in that
  case. Otherwise, it returns "/Library/Fonts" path, in assumption
  that X11 toolkit is used.

  Obviously, this check does not work in case of HeadlessToolkit,
  where the underlying toolkit instance need to be checked.

  Please note that in jdk8 this issue is masqueraded by a problem
  reported in CR 7194935, which prevents a running applications in
  headless mode.

  Please take a look.

Bug: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7181199
Webrev: http://cr.openjdk.java.net/~bae/7181199/8/webrev.00/

Thanks,
Andrew