From a0b7d4f5776fd8e3bbd1cd63316a4ba0eab3f58e Mon Sep 17 00:00:00 2001
From: Alexander Shalamov <alexander.shalamov@mapbox.com>
Date: Fri, 20 Mar 2020 10:27:00 +0200
Subject: Release snapshotter pointer to deleting lambda

---
 .../android/src/snapshotter/map_snapshotter.cpp    | 36 ++++++++++------------
 .../android/src/snapshotter/map_snapshotter.hpp    | 15 +++------
 2 files changed, 20 insertions(+), 31 deletions(-)

diff --git a/platform/android/src/snapshotter/map_snapshotter.cpp b/platform/android/src/snapshotter/map_snapshotter.cpp
index c72d657fc5..812bd414eb 100644
--- a/platform/android/src/snapshotter/map_snapshotter.cpp
+++ b/platform/android/src/snapshotter/map_snapshotter.cpp
@@ -1,6 +1,5 @@
 #include "map_snapshotter.hpp"
 
-#include <mapbox/weak.hpp>
 #include <mbgl/actor/scheduler.hpp>
 #include <mbgl/renderer/renderer.hpp>
 #include <mbgl/style/style.hpp>
@@ -13,20 +12,6 @@
 namespace mbgl {
 namespace android {
 
-MapSnapshotter::DeleteOnThread::DeleteOnThread() = default;
-MapSnapshotter::DeleteOnThread::DeleteOnThread(mapbox::base::WeakPtr<mbgl::Scheduler> weakScheduler_)
-    : weakScheduler(weakScheduler_) {}
-
-void MapSnapshotter::DeleteOnThread::operator()(mbgl::MapSnapshotter* p) const {
-    auto guard = weakScheduler.lock();
-    if (weakScheduler && weakScheduler.get() != mbgl::Scheduler::GetCurrent()) {
-        weakScheduler->schedule(
-            [ptr = std::shared_ptr<mbgl::MapSnapshotter>(p, DeleteOnThread(weakScheduler))] { (void)ptr; });
-    } else {
-        delete p;
-    }
-}
-
 MapSnapshotter::MapSnapshotter(jni::JNIEnv& _env,
                                const jni::Object<MapSnapshotter>& _obj,
                                const jni::Object<FileSource>& _jFileSource,
@@ -48,20 +33,20 @@ MapSnapshotter::MapSnapshotter(jni::JNIEnv& _env,
         return;
     }
 
+    weakScheduler = mbgl::Scheduler::GetCurrent()->makeWeakPtr();
+
     jFileSource = FileSource::getNativePeer(_env, _jFileSource);
     auto size = mbgl::Size { static_cast<uint32_t>(width), static_cast<uint32_t>(height) };
 
     showLogo = _showLogo;
 
     // Create the core snapshotter
-    snapshotter = std::unique_ptr<mbgl::MapSnapshotter, DeleteOnThread>(
-        new mbgl::MapSnapshotter(size,
+    snapshotter = std::make_unique<mbgl::MapSnapshotter>(size,
                                  pixelRatio,
                                  mbgl::android::FileSource::getSharedResourceOptions(_env, _jFileSource),
                                  *this,
                                  _localIdeographFontFamily ? jni::Make<std::string>(_env, _localIdeographFontFamily)
-                                                           : optional<std::string>{}),
-        DeleteOnThread(mbgl::Scheduler::GetCurrent()->makeWeakPtr()));
+                                                           : optional<std::string>{});
 
     if (position) {
         snapshotter->setCameraOptions(CameraPosition::getCameraOptions(_env, position, pixelRatio));
@@ -78,7 +63,18 @@ MapSnapshotter::MapSnapshotter(jni::JNIEnv& _env,
     }
 }
 
-MapSnapshotter::~MapSnapshotter() = default;
+MapSnapshotter::~MapSnapshotter() {
+    auto guard = weakScheduler.lock();
+    if (weakScheduler && weakScheduler.get() != mbgl::Scheduler::GetCurrent()) {
+        snapshotter->cancel();
+        weakScheduler->schedule([ptr = snapshotter.release()]() mutable {
+            if (ptr) {
+                delete ptr;
+                ptr = nullptr;
+            }
+        });
+    }
+}
 
 void MapSnapshotter::start(JNIEnv& env) {
     MBGL_VERIFY_THREAD(tid);
diff --git a/platform/android/src/snapshotter/map_snapshotter.hpp b/platform/android/src/snapshotter/map_snapshotter.hpp
index 99c8b6d2df..c7c25faab4 100644
--- a/platform/android/src/snapshotter/map_snapshotter.hpp
+++ b/platform/android/src/snapshotter/map_snapshotter.hpp
@@ -3,6 +3,8 @@
 #include <jni/jni.hpp>
 #include <mbgl/map/map_snapshotter.hpp>
 #include <mbgl/util/util.hpp>
+#include <mapbox/weak.hpp>
+
 #include <memory>
 
 #include "../file_source.hpp"
@@ -62,16 +64,6 @@ public:
     void onDidFinishLoadingStyle() override;
     void onStyleImageMissing(const std::string&) override;
 
-private:
-    struct DeleteOnThread {
-        DeleteOnThread();
-        explicit DeleteOnThread(mapbox::base::WeakPtr<mbgl::Scheduler>);
-        void operator()(mbgl::MapSnapshotter* p) const;
-
-    private:
-        mapbox::base::WeakPtr<mbgl::Scheduler> weakScheduler;
-    };
-
 private:
     MBGL_STORE_THREAD(tid);
 
@@ -85,7 +77,8 @@ private:
     void activateFilesource(JNIEnv&);
     void deactivateFilesource(JNIEnv&);
     bool activatedFilesource = false;
-    std::unique_ptr<mbgl::MapSnapshotter, DeleteOnThread> snapshotter;
+    mapbox::base::WeakPtr<mbgl::Scheduler> weakScheduler;
+    std::unique_ptr<mbgl::MapSnapshotter> snapshotter;
 };
 
 } // namespace android
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