Bug 1866965 - Add list of standard fonts for Fedora 38. r=emilio

Fedora 38 is still supported since Fedora supports the previous release
in addition to the current one. I added a font list for Fedora 38 and
code to detect the version.

Depends on D197229

Differential Revision: https://phabricator.services.mozilla.com/D197230

gfx/thebes/StandardFonts-linux.inc

@@ -1005,3 +1005,61 @@ static const char* kBaseFonts_Fedora_39[] = {
   "ആർഐടി രചന",
   "രചന",
 };
+
+// List of standard font families installed on Fedora 38 Workstation.
+static const char* kBaseFonts_Fedora_38[] = {
+  "Cantarell",
+  "Jomolhari",
+  "Liberation Mono",
+  "Liberation Sans",
+  "Liberation Serif",
+  "Lohit Assamese",
+  "Lohit Bengali",
+  "Lohit Devanagari",
+  "Lohit Gujarati",
+  "Lohit Kannada",
+  "Lohit Marathi",
+  "Lohit Odia",
+  "Lohit Tamil",
+  "Lohit Telugu",
+  "Mingzat",
+  "Noto Color Emoji",
+  "Noto Naskh Arabic",
+  "Noto Sans",
+  "Noto Sans Arabic",
+  "Noto Sans Armenian",
+  "Noto Sans Canadian Aboriginal",
+  "Noto Sans Cherokee",
+  "Noto Sans CJK HK",
+  "Noto Sans CJK JP",
+  "Noto Sans CJK KR",
+  "Noto Sans CJK SC",
+  "Noto Sans CJK TC",
+  "Noto Sans Ethiopic",
+  "Noto Sans Georgian",
+  "Noto Sans Gurmukhi",
+  "Noto Sans Hebrew",
+  "Noto Sans Khmer",
+  "Noto Sans Lao",
+  "Noto Sans Math",
+  "Noto Sans Mono",
+  "Noto Sans Mono CJK HK",
+  "Noto Sans Mono CJK JP",
+  "Noto Sans Mono CJK KR",
+  "Noto Sans Mono CJK SC",
+  "Noto Sans Mono CJK TC",
+  "Noto Sans Sinhala",
+  "Noto Sans Thaana",
+  "Noto Sans Thai",
+  "Noto Serif",
+  "Nuosu SIL",
+  "Padauk",
+  "PakType Naskh Basic",
+  "RIT Meera New",
+  "STIX",
+  "STIX Two Math",
+  "STIX Two Text",
+  "STIX Two Text Medium",
+  "STIX Two Text SemiBold",
+  "Vazirmatn",
+};

gfx/thebes/gfxFcPlatformFontList.cpp

@@ -1359,6 +1359,7 @@ gfxFcPlatformFontList::gfxFcPlatformFontList()
   CheckFamilyList(kBaseFonts_Ubuntu_20_04);
   CheckFamilyList(kLangFonts_Ubuntu_20_04);
   CheckFamilyList(kBaseFonts_Fedora_39);
+  CheckFamilyList(kBaseFonts_Fedora_38);
   mLastConfig = FcConfigGetCurrent();
   if (XRE_IsParentProcess()) {
     // if the rescan interval is set, start the timer
@@ -1999,7 +2000,7 @@ gfxFcPlatformFontList::DistroID gfxFcPlatformFontList::GetDistroID() const {
           if (strncmp(buf + 3, "ubuntu", 6) == 0) {
             result = DistroID::Ubuntu_any;
           } else if (strncmp(buf + 3, "fedora", 6) == 0) {
-            result = DistroID::Fedora;
+            result = DistroID::Fedora_any;
           }
           if (versionMajor) {
             break;
@@ -2014,6 +2015,12 @@ gfxFcPlatformFontList::DistroID gfxFcPlatformFontList::GetDistroID() const {
       } else if (versionMajor == 22) {
         result = DistroID::Ubuntu_22;
       }
+    } else if (result == DistroID::Fedora_any) {
+      if (versionMajor == 38) {
+        result = DistroID::Fedora_38;
+      } else if (versionMajor == 39) {
+        result = DistroID::Fedora_39;
+      }
     }
     return result;
   };
@@ -2048,10 +2055,21 @@ FontVisibility gfxFcPlatformFontList::GetVisibilityForFamily(
       }
       return FontVisibility::User;
 
-    case DistroID::Fedora:
+    case DistroID::Fedora_any:
+    case DistroID::Fedora_39:
       if (FamilyInList(aName, kBaseFonts_Fedora_39)) {
         return FontVisibility::Base;
       }
+      if (distro == DistroID::Fedora_39) {
+        return FontVisibility::User;
+      }
+      // For Fedora_any, fall through to also check Fedora 38 list.
+      [[fallthrough]];
+
+    case DistroID::Fedora_38:
+      if (FamilyInList(aName, kBaseFonts_Fedora_38)) {
+        return FontVisibility::Base;
+      }
       return FontVisibility::User;
 
     default:

gfx/thebes/gfxFcPlatformFontList.h

@@ -356,7 +356,9 @@ class gfxFcPlatformFontList final : public gfxPlatformFontList {
     Ubuntu_any,
     Ubuntu_20,
     Ubuntu_22,
-    Fedora,
+    Fedora_any,
+    Fedora_38,
+    Fedora_39,
     // To be extended with any distros that ship a useful base set of fonts
     // that we want to explicitly support.
   };