From ae15662103a23b02eff1b7bce1c76c7dac8a175d Mon Sep 17 00:00:00 2001
From: Jason Simmons <jason-simmons@users.noreply.github.com>
Date: Mon, 25 Jun 2018 13:23:46 -0700
Subject: [PATCH] Purge the Skia font cache after deleting an engine's
 FontCollection (flutter/engine#5598)

See https://github.com/flutter/flutter/issues/18728
---
 engine/src/flutter/lib/ui/text/font_collection.cc | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/engine/src/flutter/lib/ui/text/font_collection.cc b/engine/src/flutter/lib/ui/text/font_collection.cc
index 67012519c9..b0ecc7514b 100644
--- a/engine/src/flutter/lib/ui/text/font_collection.cc
+++ b/engine/src/flutter/lib/ui/text/font_collection.cc
@@ -11,6 +11,7 @@
 #include "third_party/rapidjson/rapidjson/document.h"
 #include "third_party/rapidjson/rapidjson/rapidjson.h"
 #include "third_party/skia/include/core/SkFontMgr.h"
+#include "third_party/skia/include/core/SkGraphics.h"
 #include "third_party/skia/include/core/SkStream.h"
 #include "third_party/skia/include/core/SkTypeface.h"
 #include "txt/asset_font_manager.h"
@@ -24,7 +25,10 @@ FontCollection::FontCollection()
   collection_->SetDefaultFontManager(SkFontMgr::RefDefault());
 }
 
-FontCollection::~FontCollection() = default;
+FontCollection::~FontCollection() {
+  collection_.reset();
+  SkGraphics::PurgeFontCache();
+}
 
 std::shared_ptr<txt::FontCollection> FontCollection::GetFontCollection() const {
   return collection_;