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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 CHROME_BROWSER_FAVICON_HELPER_H__
#define CHROME_BROWSER_FAVICON_HELPER_H__
#pragma once
#include "base/basictypes.h"
#include "base/callback.h"
#include "chrome/browser/favicon_service.h"
#include "chrome/common/favicon_url.h"
#include "content/browser/tab_contents/tab_contents_observer.h"
#include "googleurl/src/gurl.h"
class FaviconHandler;
class NavigationEntry;
class Profile;
class RefCountedMemory;
class SkBitmap;
class TabContents;
// FaviconHelper works with FaviconHandlers to fetch the favicons.
//
// FetchFavicon fetchs the give page's icons. It requests the icons from history
// backend. If the icon is not available or expired, the icon will be
// downloaded and saved in history backend.
//
// DownloadImage downloads the specified icon and returns it through the given
// callback.
//
class FaviconHelper : public TabContentsObserver {
public:
explicit FaviconHelper(TabContents* tab_contents);
virtual ~FaviconHelper();
// Initiates loading the favicon for the specified url.
void FetchFavicon(const GURL& url);
// Initiates loading an image from given |image_url|. Returns a download id
// for caller to track the request. When download completes, |callback| is
// called with the three params: the download_id, a boolean flag to indicate
// whether the download succeeds and a SkBitmap as the downloaded image.
// Note that |image_size| is a hint for images with multiple sizes. The
// downloaded image is not resized to the given image_size. If 0 is passed,
// the first frame of the image is returned.
typedef Callback3<int, bool, const SkBitmap&>::Type ImageDownloadCallback;
int DownloadImage(const GURL& image_url,
int image_size,
history::IconType icon_type,
ImageDownloadCallback* callback);
// Message Handler. Must be public, because also called from
// PrerenderContents.
void OnUpdateFaviconURL(int32 page_id,
const std::vector<FaviconURL>& candidates);
private:
// TabContentsObserver overrides.
virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
void OnDidDownloadFavicon(int id,
const GURL& image_url,
bool errored,
const SkBitmap& image);
scoped_ptr<FaviconHandler> favicon_handler_;
// Handles downloading touchicons. It is NULL if
// browser_defaults::kEnableTouchIcon is false.
scoped_ptr<FaviconHandler> touch_icon_handler_;
DISALLOW_COPY_AND_ASSIGN(FaviconHelper);
};
#endif // CHROME_BROWSER_FAVICON_HELPER_H__
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