1 files changed, 13 insertions, 0 deletions
diff --git a/gfx/thebes/gfxFontEntry.h b/gfx/thebes/gfxFontEntry.h
index 364cf6c79e..82218d5611 100644
--- a/gfx/thebes/gfxFontEntry.h
+++ b/gfx/thebes/gfxFontEntry.h
@@ -273,6 +273,18 @@ class gfxFontEntry {
     return flag == LazyFlag::Yes;
   }
 
+  inline bool AlwaysNeedsMaskForShadow() {
+    LazyFlag flag = mNeedsMaskForShadow;
+    if (flag == LazyFlag::Uninitialized) {
+      flag =
+          TryGetColorGlyphs() || TryGetSVGData(nullptr) || HasColorBitmapTable()
+              ? LazyFlag::Yes
+              : LazyFlag::No;
+      mNeedsMaskForShadow = flag;
+    }
+    return flag == LazyFlag::Yes;
+  }
+
   inline bool HasCmapTable() {
     if (!mCharacterMap && !mShmemCharacterMap) {
       ReadCMAP();
@@ -670,6 +682,7 @@ class gfxFontEntry {
   std::atomic<LazyFlag> mHasGraphiteTables;
   std::atomic<LazyFlag> mHasGraphiteSpaceContextuals;
   std::atomic<LazyFlag> mHasColorBitmapTable;
+  std::atomic<LazyFlag> mNeedsMaskForShadow;
 
   enum class SpaceFeatures : uint8_t {
     Uninitialized = 0xff,