blob: b920a30e5290b2d400d15d520828c9545d098ca5 [file] [log] [blame]
// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <memory>
#include <mutex>
#include <set>
#include "flutter/assets/asset_manager.h"
#include "flutter/fml/macros.h"
#include "flutter/fml/task_runner.h"
#include "flutter/fml/unique_fd.h"
#include "third_party/skia/include/gpu/GrContextOptions.h"
namespace flutter {
/// A cache of SkData that gets stored to disk.
/// This is mainly used for Shaders but is also written to by Dart. It is
/// thread-safe for reading and writing from multiple threads.
class PersistentCache : public GrContextOptions::PersistentCache {
// Mutable static switch that can be set before GetCacheForProcess. If true,
// we'll only read existing caches but not generate new ones. Some clients
// (e.g., embedded devices) prefer generating persistent cache files for the
// specific device beforehand, and ship them as readonly files in OTA
// packages.
static bool gIsReadOnly;
static PersistentCache* GetCacheForProcess();
static void ResetCacheForProcess();
// This must be called before |GetCacheForProcess|. Otherwise, it won't
// affect the cache directory returned by |GetCacheForProcess|.
static void SetCacheDirectoryPath(std::string path);
// Convert a binary SkData key into a Base32 encoded string.
// This is used to specify persistent cache filenames and service protocol
// json keys.
static std::string SkKeyToFilePath(const SkData& data);
~PersistentCache() override;
void AddWorkerTaskRunner(fml::RefPtr<fml::TaskRunner> task_runner);
void RemoveWorkerTaskRunner(fml::RefPtr<fml::TaskRunner> task_runner);
// Whether Skia tries to store any shader into this persistent cache after
// |ResetStoredNewShaders| is called. This flag is usually reset before each
// frame so we can know if Skia tries to compile new shaders in that frame.
bool StoredNewShaders() const { return stored_new_shaders_; }
void ResetStoredNewShaders() { stored_new_shaders_ = false; }
void DumpSkp(const SkData& data);
bool IsDumpingSkp() const { return is_dumping_skp_; }
void SetIsDumpingSkp(bool value) { is_dumping_skp_ = value; }
// |GrContextOptions::PersistentCache|
sk_sp<SkData> load(const SkData& key) override;
using SkSLCache = std::pair<sk_sp<SkData>, sk_sp<SkData>>;
/// Load all the SkSL shader caches in the right directory.
std::vector<SkSLCache> LoadSkSLs();
/// Set the asset manager from which PersistentCache can load SkLSs. A nullptr
/// can be provided to clear the asset manager.
static void SetAssetManager(std::shared_ptr<AssetManager> value);
static bool cache_sksl() { return cache_sksl_; }
static void SetCacheSkSL(bool value);
static void MarkStrategySet() { strategy_set_ = true; }
static constexpr char kSkSLSubdirName[] = "sksl";
static constexpr char kAssetFileName[] = "io.flutter.shaders.json";
static std::string cache_base_path_;
static std::shared_ptr<AssetManager> asset_manager_;
static std::mutex instance_mutex_;
static std::unique_ptr<PersistentCache> gPersistentCache;
// Mutable static switch that can be set before GetCacheForProcess is called
// and GrContextOptions.fShaderCacheStrategy is set. If true, it means that
// we'll set `GrContextOptions::fShaderCacheStrategy` to `kSkSL`, and all the
// persistent cache should be stored and loaded from the "sksl" directory.
static std::atomic<bool> cache_sksl_;
// Guard flag to make sure that cache_sksl_ is not modified after
// strategy_set_ becomes true.
static std::atomic<bool> strategy_set_;
const bool is_read_only_;
const std::shared_ptr<fml::UniqueFD> cache_directory_;
const std::shared_ptr<fml::UniqueFD> sksl_cache_directory_;
mutable std::mutex worker_task_runners_mutex_;
std::multiset<fml::RefPtr<fml::TaskRunner>> worker_task_runners_;
bool stored_new_shaders_ = false;
bool is_dumping_skp_ = false;
static sk_sp<SkData> LoadFile(const fml::UniqueFD& dir,
const std::string& filen_ame);
bool IsValid() const;
PersistentCache(bool read_only = false);
// |GrContextOptions::PersistentCache|
void store(const SkData& key, const SkData& data) override;
fml::RefPtr<fml::TaskRunner> GetWorkerTaskRunner() const;
} // namespace flutter