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// Copyright (c) 2012 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 CHROME_BROWSER_THUMBNAILS_THUMBNAIL_SERVICE_H_
#define CHROME_BROWSER_THUMBNAILS_THUMBNAIL_SERVICE_H_
#include "components/history/core/common/thumbnail_score.h"
#include "components/keyed_service/content/refcounted_browser_context_keyed_service.h"
#include "ui/gfx/image/image.h"
class GURL;
namespace base {
class RefCountedMemory;
}
namespace thumbnails {
class ThumbnailingAlgorithm;
struct ThumbnailingContext;
// An interface abstracting access to thumbnails. Intended as a temporary
// bridge facilitating switch from TopSites as the thumbnail source to a more
// robust way of handling these artefacts.
class ThumbnailService : public RefcountedBrowserContextKeyedService {
public:
// Sets the given thumbnail for the given URL. Returns true if the thumbnail
// was updated. False means either the URL wasn't known to us, or we felt
// that our current thumbnail was superior to the given one.
virtual bool SetPageThumbnail(const ThumbnailingContext& context,
const gfx::Image& thumbnail) = 0;
// Returns the ThumbnailingAlgorithm used for processing thumbnails.
// It is always a new instance, the caller owns it. It will encapsulate the
// process of creating a thumbnail from tab contents. The lifetime of these
// instances is limited to the act of processing a single tab image. They
// are permitted to hold the state of such process.
virtual ThumbnailingAlgorithm* GetThumbnailingAlgorithm() const = 0;
// Gets a thumbnail for a given page. Returns true iff we have the thumbnail.
// This may be invoked on any thread.
// If an exact thumbnail URL match fails, |prefix_match| specifies whether or
// not to try harder by matching the query thumbnail URL as URL prefix (as
// defined by UrlIsPrefix()).
// As this method may be invoked on any thread the ref count needs to be
// incremented before this method returns, so this takes a scoped_refptr*.
virtual bool GetPageThumbnail(
const GURL& url,
bool prefix_match,
scoped_refptr<base::RefCountedMemory>* bytes) = 0;
// Add or updates a |url| for which we should force the capture of a thumbnail
// next time it's visited.
virtual void AddForcedURL(const GURL& url) = 0;
// Returns true if the page thumbnail should be updated.
virtual bool ShouldAcquirePageThumbnail(const GURL& url) = 0;
protected:
virtual ~ThumbnailService() {}
};
} // namespace thumbnails
#endif // CHROME_BROWSER_THUMBNAILS_THUMBNAIL_SERVICE_H_
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