chromium/content/browser/renderer_host/navigation_transitions/navigation_entry_screenshot_cache.h

// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_RENDERER_HOST_NAVIGATION_TRANSITIONS_NAVIGATION_ENTRY_SCREENSHOT_CACHE_H_
#define CONTENT_BROWSER_RENDERER_HOST_NAVIGATION_TRANSITIONS_NAVIGATION_ENTRY_SCREENSHOT_CACHE_H_

#include "base/containers/flat_set.h"
#include "base/functional/callback_forward.h"
#include "base/memory/safe_ref.h"
#include "content/browser/renderer_host/navigation_controller_impl.h"
#include "content/browser/renderer_host/navigation_transitions/navigation_entry_screenshot_manager.h"
#include "content/common/content_export.h"

namespace content {

class NavigationEntry;
class NavigationEntryScreenshot;
class NavigationEntryScreenshotManager;

// This interface limits the access of the `NavigationEntryScreenshotManager` to
// the `NavigationEntryScreenshotCache`: we do not want the manager to
// accidentally perform any "Set" or "Take" operations on the cache. This is
// because the manager is owned by the `BrowserContext` who has access across
// the tabs, and we do not want any tab specific pixel data leaked across tabs.
class NavigationEntryScreenshotCacheEvictor { … };

// `NavigationEntryScreenshotCache` tracks `NavigationEntryScreenshot`s per
// `FrameTree`. It is owned by the `NavigationController` of the primary
// `FrameTree` of a `WebContents`.
class CONTENT_EXPORT NavigationEntryScreenshotCache
    : public NavigationEntryScreenshotCacheEvictor { … };

}  // namespace content

#endif  // CONTENT_BROWSER_RENDERER_HOST_NAVIGATION_TRANSITIONS_NAVIGATION_ENTRY_SCREENSHOT_CACHE_H_