1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef CHROME_BROWSER_THUMBNAILS_THUMBNAIL_SERVICE_H_ 6 #define CHROME_BROWSER_THUMBNAILS_THUMBNAIL_SERVICE_H_ 7 8 #include "components/history/core/common/thumbnail_score.h" 9 #include "components/keyed_service/content/refcounted_browser_context_keyed_service.h" 10 #include "ui/gfx/image/image.h" 11 12 class GURL; 13 14 namespace base { 15 class RefCountedMemory; 16 } 17 18 namespace thumbnails { 19 20 class ThumbnailingAlgorithm; 21 struct ThumbnailingContext; 22 23 // An interface abstracting access to thumbnails. Intended as a temporary 24 // bridge facilitating switch from TopSites as the thumbnail source to a more 25 // robust way of handling these artefacts. 26 class ThumbnailService : public RefcountedBrowserContextKeyedService { 27 public: 28 // Sets the given thumbnail for the given URL. Returns true if the thumbnail 29 // was updated. False means either the URL wasn't known to us, or we felt 30 // that our current thumbnail was superior to the given one. 31 virtual bool SetPageThumbnail(const ThumbnailingContext& context, 32 const gfx::Image& thumbnail) = 0; 33 34 // Returns the ThumbnailingAlgorithm used for processing thumbnails. 35 // It is always a new instance, the caller owns it. It will encapsulate the 36 // process of creating a thumbnail from tab contents. The lifetime of these 37 // instances is limited to the act of processing a single tab image. They 38 // are permitted to hold the state of such process. 39 virtual ThumbnailingAlgorithm* GetThumbnailingAlgorithm() const = 0; 40 41 // Gets a thumbnail for a given page. Returns true iff we have the thumbnail. 42 // This may be invoked on any thread. 43 // If an exact thumbnail URL match fails, |prefix_match| specifies whether or 44 // not to try harder by matching the query thumbnail URL as URL prefix (as 45 // defined by UrlIsPrefix()). 46 // As this method may be invoked on any thread the ref count needs to be 47 // incremented before this method returns, so this takes a scoped_refptr*. 48 virtual bool GetPageThumbnail( 49 const GURL& url, 50 bool prefix_match, 51 scoped_refptr<base::RefCountedMemory>* bytes) = 0; 52 53 // Add or updates a |url| for which we should force the capture of a thumbnail 54 // next time it's visited. 55 virtual void AddForcedURL(const GURL& url) = 0; 56 57 // Returns true if the page thumbnail should be updated. 58 virtual bool ShouldAcquirePageThumbnail(const GURL& url) = 0; 59 60 protected: 61 virtual ~ThumbnailService() {} 62 }; 63 64 } // namespace thumbnails 65 66 #endif // CHROME_BROWSER_THUMBNAILS_THUMBNAIL_SERVICE_H_ 67
