Back to index

lightning-sunbird  0.9+nobinonly
nsFontMetricsUtils.cpp
Go to the documentation of this file.
00001 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
00002 /* vim:expandtab:shiftwidth=4:tabstop=4:
00003  */
00004 /* ***** BEGIN LICENSE BLOCK *****
00005  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00006  *
00007  * The contents of this file are subject to the Mozilla Public License Version
00008  * 1.1 (the "License"); you may not use this file except in compliance with
00009  * the License. You may obtain a copy of the License at
00010  * http://www.mozilla.org/MPL/
00011  *
00012  * Software distributed under the License is distributed on an "AS IS" basis,
00013  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00014  * for the specific language governing rights and limitations under the
00015  * License.
00016  *
00017  * The Original Code is mozilla.org code.
00018  *
00019  * The Initial Developer of the Original Code is
00020  * Christopher Blizzard <blizzard@mozilla.org>.  
00021  * Portions created by the Initial Developer are Copyright (C) 2002
00022  * the Initial Developer. All Rights Reserved.
00023  *
00024  * Contributor(s):
00025  *
00026  * Alternatively, the contents of this file may be used under the terms of
00027  * either the GNU General Public License Version 2 or later (the "GPL"), or
00028  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00029  * in which case the provisions of the GPL or the LGPL are applicable instead
00030  * of those above. If you wish to allow use of your version of this file only
00031  * under the terms of either the GPL or the LGPL, and not to allow others to
00032  * use your version of this file under the terms of the MPL, indicate your
00033  * decision by deleting the provisions above and replace them with the notice
00034  * and other provisions required by the GPL or the LGPL. If you do not delete
00035  * the provisions above, a recipient may use your version of this file under
00036  * the terms of any one of the MPL, the GPL or the LGPL.
00037  *
00038  * ***** END LICENSE BLOCK ***** */
00039 
00040 // welcome to the dumping ground for font metrics stuff that has to
00041 // know about both the xft and core fonts code.
00042 
00043 #ifdef MOZ_ENABLE_XFT
00044 #include "nsFontMetricsXft.h"
00045 #include "nsIPref.h"
00046 #include "nsServiceManagerUtils.h"
00047 #include "prenv.h"
00048 #endif /* MOZ_ENABLE_XFT */
00049 
00050 #include "nsFontMetricsUtils.h"
00051 
00052 PRUint32
00053 NS_FontMetricsGetHints(void)
00054 {
00055 #ifdef MOZ_ENABLE_XFT
00056     if (NS_IsXftEnabled()) {
00057         return nsFontMetricsXft::GetHints();
00058     }
00059 #endif
00060 }
00061 
00062 nsresult
00063 NS_FontMetricsFamilyExists(nsIDeviceContext *aDevice, const nsString &aName)
00064 {
00065 #ifdef MOZ_ENABLE_XFT
00066     // try to fall through to the core fonts if xft fails
00067     if (NS_IsXftEnabled()) {
00068         return nsFontMetricsXft::FamilyExists(aDevice, aName);
00069     }
00070 #endif
00071 }
00072 
00073 #ifdef MOZ_ENABLE_XFT
00074 
00075 PRBool
00076 NS_IsXftEnabled(void)
00077 {
00078     static PRBool been_here = PR_FALSE;
00079     static PRBool cachedXftSetting = PR_TRUE;
00080 
00081     if (!been_here) {
00082         been_here = PR_TRUE;
00083         nsCOMPtr<nsIPref> prefService;
00084         prefService = do_GetService(NS_PREF_CONTRACTID);
00085         if (!prefService)
00086             return PR_TRUE;
00087 
00088         nsresult rv;
00089 
00090         rv = prefService->GetBoolPref("fonts.xft.enabled", &cachedXftSetting);
00091 
00092         // Yes, this makes sense.  If xft is compiled in and there's no
00093         // pref, it's automatically enabled.  If there's no pref, check
00094         // the environment.
00095         if (NS_FAILED(rv)) {
00096             char *val = PR_GetEnv("GDK_USE_XFT");
00097 
00098             if (val && val[0] == '0') {
00099                 cachedXftSetting = PR_FALSE;
00100                 goto end;
00101             }
00102 
00103             cachedXftSetting = PR_TRUE;
00104         }
00105     }
00106 
00107  end:
00108 
00109     return cachedXftSetting;
00110 }
00111 
00112 #endif /* MOZ_ENABLE_XFT */
00113