diff --git a/src/gpu/text/GrTextBlob.cpp b/src/gpu/text/GrTextBlob.cpp
index fb7f59b..4768b7c 100644
--- a/src/gpu/text/GrTextBlob.cpp
+++ b/src/gpu/text/GrTextBlob.cpp
@@ -904,12 +904,21 @@
 
 sk_sp<GrTextBlob> GrTextBlob::Make(const SkGlyphRunList& glyphRunList, const SkMatrix& drawMatrix) {
     // The difference in alignment from the storage of VertexData to SubRun;
-    using AllSubRuns = std::aligned_union_t<1, GrSDFTSubRun, GrDirectMaskSubRun, GrPathSubRun>;
-    constexpr size_t alignDiff = alignof(AllSubRuns) - alignof(GrSDFTSubRun::VertexData);
+    using AllSubRuns = std::aligned_union_t<1,
+            GrDirectMaskSubRun,
+            GrTransformedMaskSubRun,
+            GrSDFTSubRun,
+            GrPathSubRun>;
+
+    using AllVertexData = std::aligned_union<1,
+            GrDirectMaskSubRun::VertexData,
+            GrTransformedMaskSubRun::VertexData,
+            GrSDFTSubRun::VertexData>;
+    constexpr size_t alignDiff = alignof(AllSubRuns) - alignof(AllVertexData);
     constexpr size_t vertexDataToSubRunPadding = alignDiff > 0 ? alignDiff : 0;
     size_t totalGlyphCount = glyphRunList.totalGlyphCount();
     size_t arenaSize =
-            totalGlyphCount * sizeof(GrSDFTSubRun::VertexData)
+            totalGlyphCount * sizeof(AllVertexData)
             + GrGlyphVector::GlyphVectorSize(totalGlyphCount)
             + glyphRunList.runCount() * (sizeof(AllSubRuns) + vertexDataToSubRunPadding)
             + 32;  // Misc arena overhead.
diff --git a/src/gpu/text/GrTextBlob.h b/src/gpu/text/GrTextBlob.h
index 05f65cf..4f2a966 100644
--- a/src/gpu/text/GrTextBlob.h
+++ b/src/gpu/text/GrTextBlob.h
@@ -246,11 +246,6 @@
             int begin, int end, GrMeshDrawOp::Target* target) const = 0;
 
 protected:
-    using VertexData = std::tuple<
-            SkPoint,   // glyph position.
-            GrIRect16  // glyph bounding rectangle.
-        >;
-
     struct AtlasPt {
         uint16_t u;
         uint16_t v;
@@ -315,6 +310,11 @@
 // -- GrDirectMaskSubRun ---------------------------------------------------------------------------
 class GrDirectMaskSubRun final : public GrAtlasSubRun {
 public:
+    using VertexData = std::tuple<
+            SkPoint,   // glyph position.
+            GrIRect16  // glyph bounding rectangle.
+    >;
+
     GrDirectMaskSubRun(GrMaskFormat format,
                        GrTextBlob* blob,
                        const SkRect& bounds,