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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.
+ *
+ * @return array of names
+ * @return void
+ */
+ Array<AString> EnumerateAllFonts();
+
+ /**
+ * 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
+ * @return array of names
+ * @return void
+ */
+ Array<AString> EnumerateFonts(in string aLangGroup, in string aGeneric);
+
+ /**
+ * Return a promise that resolves to a sorted array of the names of all
+ * installed fonts.
+ *
+ * @return Promise that resolves to Array
+ */
+ [implicit_jscontext]
+ jsval EnumerateAllFontsAsync();
+
+ /**
+ * Return a promise that resolves to 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
+ * @return Promise that resolves to Array
+ */
+ [implicit_jscontext]
+ jsval EnumerateFontsAsync(in string aLangGroup, in string aGeneric);
+
+ /**
+ @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);
+
+ /**
+ * 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);
+};