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/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"

[scriptable, uuid(924d98d9-3518-4cb4-8708-c74fe8e3ec3c)]
interface nsIFontEnumerator : nsISupports
{
  /**
   * Return a sorted array of the names of all installed fonts.
   *
   * @param  aCount     returns number of names returned
   * @param  aResult    returns array of names
   * @return void
   */
  void EnumerateAllFonts(out uint32_t aCount,
    [retval, array, size_is(aCount)] out wstring aResult);

  /**
   * Return a sorted array of names of fonts that support the given language
   * group and are suitable for use as the given CSS generic font.
   *
   * @param  aLangGroup language group
   * @param  aGeneric   CSS generic font
   * @param  aCount     returns number of names returned
   * @param  aResult    returns array of names
   * @return void
   */
  void EnumerateFonts(in string aLangGroup, in string aGeneric,
    out uint32_t aCount, [retval, array, size_is(aCount)] out wstring aResult);

  /**
    @param  aLangGroup language group
    @return bool do we have a font for this language group
   */
  void HaveFontFor(in string aLangGroup, [retval] out boolean aResult);

  /**
   * @param  aLangGroup language group
   * @param  aGeneric CSS generic font
   * @return suggested default font for this language group and generic family
   */
  wstring getDefaultFont(in string aLangGroup, in string aGeneric);

  /**
   * update the global font list
   * return true if font list is changed
   */
  boolean updateFontList();

  /**
   * get the standard family name on the system from given family
   * @param  aName family name which may be alias
   * @return the standard family name on the system, if given name does not
   *         exist, returns empty string
   */
  wstring getStandardFamilyName(in wstring aName);
};