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lightning-sunbird  0.9+nobinonly
nsFontMetricsUtils.cpp
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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 #ifdef MOZ_ENABLE_COREXFONTS
00051 #include "nsFontMetricsGTK.h"
00052 #endif
00053 
00054 #ifdef MOZ_ENABLE_PANGO
00055 #include "nsFontMetricsPango.h"
00056 #include "prenv.h"
00057 #endif
00058 
00059 #include "nsFontMetricsUtils.h"
00060 
00061 PRUint32
00062 NS_FontMetricsGetHints(void)
00063 {
00064 #ifdef MOZ_ENABLE_PANGO
00065     if (NS_IsPangoEnabled()) {
00066         return nsFontMetricsPango::GetHints();
00067     }
00068 #endif
00069 #ifdef MOZ_ENABLE_XFT
00070     if (NS_IsXftEnabled()) {
00071         return nsFontMetricsXft::GetHints();
00072     }
00073 #endif
00074 
00075 #ifdef MOZ_ENABLE_COREXFONTS
00076     return nsFontMetricsGTK::GetHints();
00077 #endif
00078 }
00079 
00080 nsresult
00081 NS_FontMetricsFamilyExists(nsIDeviceContext *aDevice, const nsString &aName)
00082 {
00083 #ifdef MOZ_ENABLE_PANGO
00084     if (NS_IsPangoEnabled()) {
00085         return nsFontMetricsPango::FamilyExists(aDevice, aName);
00086     }
00087 #endif
00088 #ifdef MOZ_ENABLE_XFT
00089     // try to fall through to the core fonts if xft fails
00090     if (NS_IsXftEnabled()) {
00091         return nsFontMetricsXft::FamilyExists(aDevice, aName);
00092     }
00093 #endif
00094 
00095 #ifdef MOZ_ENABLE_COREXFONTS
00096     return nsFontMetricsGTK::FamilyExists(aDevice, aName);
00097 #endif
00098 }
00099 
00100 #if defined(MOZ_ENABLE_XFT) && defined(MOZ_ENABLE_COREXFONTS)
00101 
00102 PRBool
00103 NS_IsXftEnabled(void)
00104 {
00105     static PRBool been_here = PR_FALSE;
00106     static PRBool cachedXftSetting = PR_TRUE;
00107 
00108     if (!been_here) {
00109         been_here = PR_TRUE;
00110         nsCOMPtr<nsIPref> prefService;
00111         prefService = do_GetService(NS_PREF_CONTRACTID);
00112         if (!prefService)
00113             return PR_TRUE;
00114 
00115         nsresult rv;
00116 
00117         rv = prefService->GetBoolPref("fonts.xft.enabled", &cachedXftSetting);
00118 
00119         // Yes, this makes sense.  If xft is compiled in and there's no
00120         // pref, it's automatically enabled.  If there's no pref, check
00121         // the environment.
00122         if (NS_FAILED(rv)) {
00123             char *val = PR_GetEnv("GDK_USE_XFT");
00124 
00125             if (val && val[0] == '0') {
00126                 cachedXftSetting = PR_FALSE;
00127                 goto end;
00128             }
00129 
00130             cachedXftSetting = PR_TRUE;
00131         }
00132     }
00133 
00134  end:
00135 
00136     return cachedXftSetting;
00137 }
00138 
00139 #endif
00140 
00141 #if defined(MOZ_ENABLE_PANGO) && (defined(MOZ_ENABLE_XFT) || defined(MOZ_ENABLE_COREXFONTS))
00142 
00143 PRBool
00144 NS_IsPangoEnabled(void)
00145 {
00146     char *val = PR_GetEnv("MOZ_DISABLE_PANGO");
00147     if (val)
00148         return FALSE;
00149 
00150     return TRUE;
00151 }
00152 
00153 #endif