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// Copyright (c) 2011 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 CONTENT_RENDERER_FAVICON_HELPER_H_
#define CONTENT_RENDERER_FAVICON_HELPER_H_
#include <string>
#include <vector>
#include "base/memory/linked_ptr.h"
#include "base/memory/scoped_vector.h"
#include "content/public/renderer/render_view_observer.h"
#include "googleurl/src/gurl.h"
class SkBitmap;
namespace content {
struct FaviconURL;
}
namespace webkit_glue {
class MultiResolutionImageResourceFetcher;
}
namespace content {
struct FaviconURL;
// This class deals with favicon downloading.
// There is one FaviconHelper per RenderView, which is owned by the RenderView.
class FaviconHelper : public RenderViewObserver {
public:
explicit FaviconHelper(RenderView* render_view);
// Sund a message that the favicon has changed.
void DidChangeIcon(WebKit::WebFrame* frame,
WebKit::WebIconURL::Type icon_type);
private:
virtual ~FaviconHelper();
// Message handler.
void OnDownloadFavicon(int id, const GURL& image_url, int image_size);
// Requests to download a favicon image. When done, the RenderView
// is notified by way of DidDownloadFavicon. Returns true if the
// request was successfully started, false otherwise. id is used to
// uniquely identify the request and passed back to the
// DidDownloadFavicon method. If the image has multiple frames, the
// frame whose size is image_size is returned. If the image doesn't
// have a frame at the specified size, the first is returned.
bool DownloadFavicon(int id, const GURL& image_url, int image_size);
// This callback is triggered when DownloadFavicon completes, either
// succesfully or with a failure. See DownloadFavicon for more
// details.
void DidDownloadFavicon(
int requested_size,
webkit_glue::MultiResolutionImageResourceFetcher* fetcher,
const std::vector<SkBitmap>& images);
// Decodes a data: URL image or returns an empty image in case of failure.
SkBitmap ImageFromDataUrl(const GURL&) const;
// Send a message to update the favicon URL for a page.
void SendUpdateFaviconURL(int32 routing_id,
int32 page_id,
const std::vector<FaviconURL>& urls);
// RenderViewObserver implementation.
virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
virtual void DidStopLoading() OVERRIDE;
typedef ScopedVector<webkit_glue::MultiResolutionImageResourceFetcher>
ImageResourceFetcherList;
// ImageResourceFetchers schedule via DownloadImage.
ImageResourceFetcherList image_fetchers_;
DISALLOW_COPY_AND_ASSIGN(FaviconHelper);
};
} // namespace content
#endif // CONTENT_RENDERER_FAVICON_HELPER_H_
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