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Side by Side Diff: chrome/renderer/favicon_helper.h

Issue 11232068: Extract renderer-side favicon downloading code into separate helper class (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: comments Created 8 years, 1 month ago
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1 // Copyright (c) 2011 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_RENDERER_FAVICON_HELPER_H_
6 #define CHROME_RENDERER_FAVICON_HELPER_H_
7
8 #include <string>
9 #include <vector>
10
11
12 #include "base/memory/linked_ptr.h"
13 #include "base/memory/scoped_vector.h"
14 #include "content/public/renderer/render_view_observer.h"
15 #include "googleurl/src/gurl.h"
16
17 struct FaviconURL;
18 class SkBitmap;
19
20 namespace webkit_glue {
21 class MultiResolutionImageResourceFetcher;
22 }
23
24 // This class deals with favicon downloading.
25 // There is one FaviconHelper per RenderView.
joth 2012/10/30 14:41:45 perhaps also mention these instances are owned by
Cait (Slow) 2012/10/30 20:07:33 Done.
26
27 class FaviconHelper : public content::RenderViewObserver {
28 public:
29 explicit FaviconHelper(content::RenderView* render_view);
30 virtual ~FaviconHelper();
joth 2012/10/30 14:41:45 d'tor can be private. (It gets deleted via OnDestr
Cait (Slow) 2012/10/30 20:07:33 Done.
31
32 // Send a message to update the favicon URL for a page.
33 void SendUpdateFaviconURL(int32 routing_id,
34 int32 page_id,
35 const std::vector<FaviconURL>& urls);
36
37 private:
38 // This callback is triggered when DownloadFavicon completes, either
39 // succesfully or with a failure. See DownloadFavicon for more
40 // details.
41 void DidDownloadFavicon(
42 int requested_size,
43 webkit_glue::MultiResolutionImageResourceFetcher* fetcher,
44 const std::vector<SkBitmap>& images);
45
46 // Requests to download a favicon image. When done, the RenderView
47 // is notified by way of DidDownloadFavicon. Returns true if the
48 // request was successfully started, false otherwise. id is used to
49 // uniquely identify the request and passed back to the
50 // DidDownloadFavicon method. If the image has multiple frames, the
51 // frame whose size is image_size is returned. If the image doesn't
52 // have a frame at the specified size, the first is returned.
53 bool DownloadFavicon(int id, const GURL& image_url, int image_size);
54
55 // Decodes a data: URL image or returns an empty image in case of failure.
56 SkBitmap ImageFromDataUrl(const GURL&) const;
57
58 // Message handler.
59 void OnDownloadFavicon(int id, const GURL& image_url, int image_size);
60
61 // RenderViewObserver implementation.
62 virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
63
64 typedef ScopedVector<webkit_glue::MultiResolutionImageResourceFetcher>
65 ImageResourceFetcherList;
66
67 // ImageResourceFetchers schedule via DownloadImage.
68 ImageResourceFetcherList image_fetchers_;
69
70 DISALLOW_COPY_AND_ASSIGN(FaviconHelper);
71 };
72
73 #endif // CHROME_RENDERER_FAVICON_HELPER_H_
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