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| 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_RENDER_WIDGET_SNAPSHOT_TAKER_H_ | |
| 6 #define CHROME_BROWSER_THUMBNAILS_RENDER_WIDGET_SNAPSHOT_TAKER_H_ | |
| 7 | |
| 8 #include <map> | |
| 9 | |
| 10 #include "base/basictypes.h" | |
| 11 #include "base/callback_forward.h" | |
| 12 #include "base/gtest_prod_util.h" | |
| 13 #include "base/memory/linked_ptr.h" | |
| 14 #include "content/public/browser/notification_observer.h" | |
| 15 #include "content/public/browser/notification_registrar.h" | |
| 16 | |
| 17 class SkBitmap; | |
| 18 | |
| 19 namespace content { | |
| 20 class RenderWidgetHost; | |
| 21 } | |
| 22 | |
| 23 namespace gfx { | |
| 24 class Size; | |
| 25 } | |
| 26 | |
| 27 class RenderWidgetSnapshotTaker : public content::NotificationObserver { | |
| 28 public: | |
| 29 typedef base::Callback<void(const SkBitmap&)> SnapshotReadyCallback; | |
| 30 | |
| 31 RenderWidgetSnapshotTaker(); | |
| 32 virtual ~RenderWidgetSnapshotTaker(); | |
| 33 | |
| 34 // This registers a callback that can receive the resulting SkBitmap | |
| 35 // from the renderer when it is done rendering it. This is asynchronous, | |
| 36 // and it will also fetch the bitmap even if the tab is hidden. | |
| 37 // In addition, if the renderer has to be invoked, the scaling of | |
| 38 // the thumbnail happens on the rendering thread. | |
| 39 // | |
| 40 // Takes ownership of the callback object. | |
| 41 // | |
| 42 // |page_size| is the size to render the page, and |desired_size| is | |
| 43 // the size to scale the resulting rendered page to (which is done | |
| 44 // efficiently if done in the rendering thread). The resulting image | |
| 45 // will be less then twice the size of the |desired_size| in both | |
| 46 // dimensions, but might not be the exact size requested. | |
| 47 void AskForSnapshot(content::RenderWidgetHost* renderer, | |
| 48 const SnapshotReadyCallback& callback, | |
| 49 gfx::Size page_size, | |
| 50 gfx::Size desired_size); | |
| 51 | |
| 52 // Cancel any pending snapshots requested via AskForSnapshot. | |
| 53 void CancelSnapshot(content::RenderWidgetHost* renderer); | |
| 54 | |
| 55 private: | |
| 56 FRIEND_TEST_ALL_PREFIXES(RenderWidgetSnapshotTakerTest, | |
| 57 WidgetDidReceivePaintAtSizeAck); | |
| 58 FRIEND_TEST_ALL_PREFIXES(RenderWidgetSnapshotTakerTest, | |
| 59 WidgetDidReceivePaintAtSizeAckFail); | |
| 60 | |
| 61 // content::NotificationObserver overrides. | |
| 62 virtual void Observe(int type, | |
| 63 const content::NotificationSource& source, | |
| 64 const content::NotificationDetails& details) OVERRIDE; | |
| 65 | |
| 66 // Start or stop monitoring notifications for |renderer| based on the value | |
| 67 // of |monitor|. | |
| 68 void MonitorRenderer(content::RenderWidgetHost* renderer, bool monitor); | |
| 69 | |
| 70 void WidgetDidReceivePaintAtSizeAck(content::RenderWidgetHost* widget, | |
| 71 int tag, | |
| 72 const gfx::Size& size); | |
| 73 | |
| 74 content::NotificationRegistrar registrar_; | |
| 75 | |
| 76 // Map of callback objects by sequence number. | |
| 77 struct AsyncRequestInfo; | |
| 78 typedef std::map<int, | |
| 79 linked_ptr<AsyncRequestInfo> > SnapshotCallbackMap; | |
| 80 SnapshotCallbackMap callback_map_; | |
| 81 | |
| 82 // Count of how many outstanding snapshot requests there are for each | |
| 83 // RenderWidgetHost. | |
| 84 std::map<content::RenderWidgetHost*, int> host_monitor_counts_; | |
| 85 | |
| 86 DISALLOW_COPY_AND_ASSIGN(RenderWidgetSnapshotTaker); | |
| 87 }; | |
| 88 | |
| 89 #endif // CHROME_BROWSER_THUMBNAILS_RENDER_WIDGET_SNAPSHOT_TAKER_H_ | |
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Chromium Code Reviews
Issue 154083008:
Remove Tabpose feature on mac, and supporting infrastructure (PaintAtSize) (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src