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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef IOS_CHROME_BROWSER_FAVICON_FAVICON_LOADER_H_
#define IOS_CHROME_BROWSER_FAVICON_FAVICON_LOADER_H_
#include <vector>
#import "base/mac/scoped_nsobject.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/task/cancelable_task_tracker.h"
#include "base/threading/thread_checker.h"
#include "components/favicon_base/favicon_types.h"
#include "components/keyed_service/core/keyed_service.h"
class GURL;
@class NSMutableDictionary;
@class UIImage;
namespace favicon {
class FaviconService;
}
// A class that manages asynchronously loading favicons from the favicon
// service and caching them, given a URL. This is predominately used by the
// MostVisited panel, since every other display of favicons already has a
// bitmap in the relevant data structure. There is one of these per browser
// state to avoid re-creating favicons for every instance of the NTP.
class FaviconLoader : public KeyedService {
public:
// Type for completion block for ImageForURL().
typedef void (^ImageCompletionBlock)(UIImage*);
explicit FaviconLoader(favicon::FaviconService* favicon_service);
~FaviconLoader() override;
// Returns the UIImage for the favicon associated with |url|, if present.
// |types| is a bitfield of history::IconType with the acceptable types. If
// the icons is not present, will start an asynchronous load with the favicon
// service and returns the default favicon (thus it will never return nil).
// Calls |block| when the load completes with the image. If |block| is nil,
// the load is still performed so a future call will find it in the cache.
UIImage* ImageForURL(const GURL& url, int types, ImageCompletionBlock block);
// Purges the cache, in response to low-memory.
void PurgeCache();
private:
struct RequestData;
// Called when the favicon load request completes. Saves image into the
// cache. Desktop code assumes this image is in PNG format.
void OnFaviconAvailable(
scoped_ptr<RequestData> request_data,
const std::vector<favicon_base::FaviconRawBitmapResult>&
favicon_bitmap_results);
base::ThreadChecker thread_checker_;
// The FaviconService used to retrieve favicon; may be null during testing.
// Must outlive the FaviconLoader.
favicon::FaviconService* favicon_service_;
// Tracks tasks sent to FaviconService.
base::CancelableTaskTracker cancelable_task_tracker_;
// Holds cached favicons. This dictionary is populated as favicons are
// retrieved from the FaviconService. This will be emptied during low-memory
// conditions. Keyed by NSString of URL spec.
base::scoped_nsobject<NSMutableDictionary> favicon_cache_;
DISALLOW_COPY_AND_ASSIGN(FaviconLoader);
};
#endif // IOS_CHROME_BROWSER_FAVICON_FAVICON_LOADER_H_
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