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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CC_RESOURCES_UI_RESOURCE_MANAGER_H_
#define CC_RESOURCES_UI_RESOURCE_MANAGER_H_
#include <memory>
#include <unordered_map>
#include <vector>
#include "base/containers/flat_map.h"
#include "base/memory/raw_ptr.h"
#include "cc/cc_export.h"
#include "cc/resources/ui_resource_request.h"
namespace cc {
class ScopedUIResource;
// UIResourceManager creates and manages UIResourceBitmaps and UIResourceIDs
// for given bitmaps for a LayerTreeHost. There are two ways to use the
// interface:
// 1. `CreateUIResource`/`DeleteUIResource` to explicitly manage the lifetime
// of UIResources.
// 2. `GetOrCreateUIResource` to create shared UIResources backed by the same
// SkBitmap (SkPixelRef to be exact). The created UIResources are owned by
// the manager and are released when all references outside the manager's
// map are dropped.
class CC_EXPORT UIResourceManager {
public:
UIResourceManager();
UIResourceManager(const UIResourceManager&) = delete;
virtual ~UIResourceManager();
UIResourceManager& operator=(const UIResourceManager&) = delete;
// CreateUIResource creates a resource given a bitmap. The bitmap is
// generated via an interface function, which is called when initializing the
// resource and when the resource has been lost (due to lost context). The
// parameter of the interface is a single boolean, which indicates whether the
// resource has been lost or not. CreateUIResource returns an Id of the
// resource, which is always positive.
virtual UIResourceId CreateUIResource(UIResourceClient* client);
// Deletes a UI resource. May safely be called more than once.
virtual void DeleteUIResource(UIResourceId id);
base::flat_map<UIResourceId, gfx::Size> GetUIResourceSizes() const;
// Methods meant to be used only internally in cc ------------
// The current UIResourceRequestQueue is moved to the caller.
std::vector<UIResourceRequest> TakeUIResourcesRequests();
// Put the recreation of all UI resources into the resource queue after they
// were evicted on the impl thread.
void RecreateUIResources();
// Creates a resource given a SkBitmap. Multiple calls with bitmaps that
// share the same SkPixelRef will share a single resource ID. The returned
// `UIResourceId` will only be valid as long as something else holds a
// reference to the SkBitmap
UIResourceId GetOrCreateUIResource(const SkBitmap& bitmap);
size_t owned_shared_resources_size_for_test() const {
return owned_shared_resources_.size();
}
private:
struct UIResourceClientData {
raw_ptr<UIResourceClient> client;
gfx::Size size;
};
std::unordered_map<UIResourceId, UIResourceClientData>
ui_resource_client_map_;
int next_ui_resource_id_;
using UIResourceRequestQueue = std::vector<UIResourceRequest>;
UIResourceRequestQueue ui_resource_request_queue_;
// A map from bitmaps to the ScopedUIResource we've created for them. The
// resources are released when all references of SkPixelRefs outside the map
// are dropped.
std::unordered_map<SkPixelRef*, std::unique_ptr<ScopedUIResource>>
owned_shared_resources_;
};
} // namespace cc
#endif // CC_RESOURCES_UI_RESOURCE_MANAGER_H_
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