ui/android/resources/resource_manager_impl.h

// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_ANDROID_RESOURCES_RESOURCE_MANAGER_IMPL_H_
#define UI_ANDROID_RESOURCES_RESOURCE_MANAGER_IMPL_H_

#include <array>
#include <memory>
#include <unordered_map>
#include <unordered_set>

#include "base/android/scoped_java_ref.h"
#include "base/memory/raw_ptr.h"
#include "base/trace_event/memory_dump_provider.h"
#include "third_party/abseil-cpp/absl/container/flat_hash_map.h"
#include "third_party/abseil-cpp/absl/container/flat_hash_set.h"
#include "third_party/skia/include/core/SkColor.h"
#include "ui/android/resources/resource_manager.h"
#include "ui/android/ui_android_export.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/native_ui_types.h"

namespace cc {
class UIResourceManager;
}  // namespace cc

namespace ui {

class UI_ANDROID_EXPORT ResourceManagerImpl
    : public ResourceManager,
      public base::trace_event::MemoryDumpProvider {
 public:
  static ResourceManagerImpl* FromJavaObject(
      const base::android::JavaRef<jobject>& jobj);

  explicit ResourceManagerImpl(gfx::NativeWindow native_window);

  ResourceManagerImpl(const ResourceManagerImpl&) = delete;
  ResourceManagerImpl& operator=(const ResourceManagerImpl&) = delete;

  ~ResourceManagerImpl() override;

  void Init(cc::UIResourceManager* ui_resource_manager);

  // ResourceManager implementation.
  base::android::ScopedJavaLocalRef<jobject> GetJavaObject() override;
  Resource* GetResource(AndroidResourceType res_type, int res_id) override;
  Resource* GetStaticResourceWithTint(
      int res_id, SkColor tint_color) override;
  Resource* GetStaticResourceWithTint(int res_id,
                                      SkColor tint_color,
                                      bool preserve_color_alpha) override;
  Resource* GetAndRetainStaticResourceWithTint(int res_id,
                                               SkColor tint_color) override;
  void ReleaseStaticResource(int res_id) override;

  void PreloadResource(AndroidResourceType res_type, int res_id) override;
  void OnFrameUpdatesFinished() override;

  // Called from Java
  // ----------------------------------------------------------
  void OnResourceReady(JNIEnv* env,
                       int32_t res_type,
                       int32_t res_id,
                       const base::android::JavaRef<jobject>& bitmap,
                       int32_t width,
                       int32_t height,
                       jlong native_resource);
  void RemoveResource(JNIEnv* env, int32_t res_type, int32_t res_id);
  void ClearTintedResourceCache(JNIEnv* env);
  void AssertResourceExists(JNIEnv* env, int32_t res_type, int32_t res_id);

  // base::trace_event::MemoryDumpProvider implementation.
  bool OnMemoryDump(const base::trace_event::MemoryDumpArgs& args,
                    base::trace_event::ProcessMemoryDump* pmd) override;

  base::WeakPtr<ResourceManager> GetWeakPtr() override;

 private:
  friend class TestResourceManagerImpl;

  // Start loading the resource. virtual for testing.
  virtual void PreloadResourceFromJava(AndroidResourceType res_type,
                                       int res_id);
  virtual void RequestResourceFromJava(AndroidResourceType res_type,
                                       int res_id);

  // Remove tints that were unused in the current frame being built. This
  // function takes a set |used_tints| and removes all the tints not in the set
  // from the cache.
  void RemoveUnusedTints();

  using ResourceMap = std::unordered_map<int, std::unique_ptr<Resource>>;
  using TintedResourceMap =
      std::unordered_map<SkColor, std::unique_ptr<ResourceMap>>;

  raw_ptr<cc::UIResourceManager> ui_resource_manager_;
  std::array<ResourceMap, ANDROID_RESOURCE_TYPE_COUNT> resources_;
  TintedResourceMap tinted_resources_;

  // The set of tints that are used for resources in the current frame.
  absl::flat_hash_set<SkColor> used_tints_;

  absl::flat_hash_map<int, SkColor> tinted_resources_to_keep_;

  base::android::ScopedJavaGlobalRef<jobject> java_obj_;

  base::WeakPtrFactory<ResourceManagerImpl> weak_ptr_factory_{this};
};

}  // namespace ui

#endif  // UI_ANDROID_RESOURCES_RESOURCE_MANAGER_IMPL_H_