Use font.name-list.emoji preference for emoji presenration.

1 files changed, 54 insertions, 12 deletions

diff --git a/gfx/thebes/gfxPlatformFontList.cpp b/gfx/thebes/gfxPlatformFontList.cpp
index 01394db14..06da75ee4 100644
--- a/gfx/thebes/gfxPlatformFontList.cpp
+++ b/gfx/thebes/gfxPlatformFontList.cpp
@@ -869,28 +869,55 @@ gfxPlatformFontList::ResolveGenericFontNames(
     nsIAtom* langGroup = GetLangGroupForPrefLang(aPrefLang);
     NS_ASSERTION(langGroup, "null lang group for pref lang");
 
+    gfxPlatformFontList::GetFontFamiliesFromGenericFamilies(genericFamilies,
+                                                            langGroup,
+                                                            aGenericFamilies);
+
+#if 0  // dump out generic mappings
+    printf("%s ===> ", prefFontName.get());
+    for (uint32_t k = 0; k < aGenericFamilies->Length(); k++) {
+        if (k > 0) printf(", ");
+        printf("%s", NS_ConvertUTF16toUTF8(aGenericFamilies[k]->Name()).get());
+    }
+    printf("\n");
+#endif
+}
+
+void
+gfxPlatformFontList::ResolveEmojiFontNames(
+    nsTArray<RefPtr<gfxFontFamily>>* aGenericFamilies)
+{
+    // emoji preference has no lang name
+    AutoTArray<nsString,4> genericFamilies;
+
+    nsAutoCString prefFontListName("font.name-list.emoji");
+    gfxFontUtils::AppendPrefsFontList(prefFontListName.get(), genericFamilies);
+
+    gfxPlatformFontList::GetFontFamiliesFromGenericFamilies(genericFamilies,
+                                                            nullptr,
+                                                            aGenericFamilies);
+}
+
+void
+gfxPlatformFontList::GetFontFamiliesFromGenericFamilies(
+    nsTArray<nsString>& aGenericNameFamilies,
+    nsAtom* aLangGroup,
+    nsTArray<RefPtr<gfxFontFamily>>* aGenericFamilies)
+{
     // lookup and add platform fonts uniquely
-    for (const nsString& genericFamily : genericFamilies) {
+    for (const nsString& genericFamily : aGenericNameFamilies) {
         gfxFontStyle style;
-        style.language = langGroup;
+        style.language = aLangGroup;
         style.systemFont = false;
         AutoTArray<gfxFontFamily*,10> families;
-        FindAndAddFamilies(genericFamily, &families, &style);
+        FindAndAddFamilies(genericFamily, &families, FindFamiliesFlags(0),
+                           &style);
         for (gfxFontFamily* f : families) {
             if (!aGenericFamilies->Contains(f)) {
                 aGenericFamilies->AppendElement(f);
             }
         }
     }
-
-#if 0  // dump out generic mappings
-    printf("%s ===> ", prefFontName.get());
-    for (uint32_t k = 0; k < aGenericFamilies->Length(); k++) {
-        if (k > 0) printf(", ");
-        printf("%s", NS_ConvertUTF16toUTF8(aGenericFamilies[k]->Name()).get());
-    }
-    printf("\n");
-#endif
 }
 
 nsTArray<RefPtr<gfxFontFamily>>*
@@ -902,6 +929,17 @@ gfxPlatformFontList::GetPrefFontsLangGroup(mozilla::FontFamilyType aGenericType,
         aGenericType = eFamily_monospace;
     }
 
+    if (aGenericType == eFamily_moz_emoji) {
+        // Emoji font has no lang
+        PrefFontList* prefFonts = mEmojiPrefFont.get();
+        if (MOZ_UNLIKELY(!prefFonts)) {
+            prefFonts = new PrefFontList;
+            ResolveEmojiFontNames(prefFonts);
+            mEmojiPrefFont.reset(prefFonts);
+        }
+        return prefFonts;
+    }
+
     PrefFontList* prefFonts =
         mLangGroupPrefFonts[aPrefLang][aGenericType].get();
     if (MOZ_UNLIKELY(!prefFonts)) {
@@ -1180,6 +1218,10 @@ gfxPlatformFontList::AppendPrefLang(eFontPrefLang aPrefLangs[], uint32_t& aLen,
 mozilla::FontFamilyType
 gfxPlatformFontList::GetDefaultGeneric(eFontPrefLang aLang)
 {
+    if (aLang == eFontPrefLang_Emoji) {
+      return eFamily_moz_emoji;
+    }
+
     // initialize lang group pref font defaults (i.e. serif/sans-serif)
     if (MOZ_UNLIKELY(mDefaultGenericsLangGroup.IsEmpty())) {
         mDefaultGenericsLangGroup.AppendElements(ArrayLength(gPrefLangNames));