| // 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 CONTENT_BROWSER_RENDERER_HOST_BACKING_STORE_MANAGER_H_ |
| #define CONTENT_BROWSER_RENDERER_HOST_BACKING_STORE_MANAGER_H_ |
| |
| #include <vector> |
| |
| #include "base/basictypes.h" |
| #include "base/callback_forward.h" |
| #include "base/process/process.h" |
| #include "ui/gfx/rect.h" |
| #include "ui/gfx/size.h" |
| #include "ui/surface/transport_dib.h" |
| |
| namespace content { |
| class BackingStore; |
| class RenderWidgetHost; |
| |
| // This class manages backing stores in the browsr. Every RenderWidgetHost is |
| // associated with a backing store which it requests from this class. The |
| // hosts don't maintain any references to the backing stores. These backing |
| // stores are maintained in a cache which can be trimmed as needed. |
| class BackingStoreManager { |
| public: |
| // Returns a backing store which matches the desired dimensions. |
| // |
| // backing_store_rect |
| // The desired backing store dimensions. |
| // Returns a pointer to the backing store on success, NULL on failure. |
| static BackingStore* GetBackingStore(RenderWidgetHost* host, |
| const gfx::Size& desired_size); |
| |
| // Makes a backing store which is fully ready for consumption, i.e. the |
| // bitmap from the renderer has been copied into the backing store. |
| // |
| // backing_store_size |
| // The desired backing store dimensions, in DIPs. |
| // bitmap_section |
| // The bitmap section from the renderer. |
| // bitmap_rect |
| // The rect to be painted into the backing store, in DIPs. |
| // scale_factor |
| // The device scale factor the backing store is expected to be at. |
| // If the backing store's device scale factor doesn't match, it will need |
| // to scale |bitmap| at paint time. This will only be out of sync with the |
| // backing store scale factor for a few frames, right after device scale |
| // changes. |
| // needs_full_paint |
| // Set if we need to send out a request to paint the view |
| // to the renderer. |
| static void PrepareBackingStore( |
| RenderWidgetHost* host, |
| const gfx::Size& backing_store_size, |
| TransportDIB::Id bitmap, |
| const gfx::Rect& bitmap_rect, |
| const std::vector<gfx::Rect>& copy_rects, |
| float scale_factor, |
| const base::Closure& completion_callback, |
| bool* needs_full_paint, |
| bool* scheduled_completion_callback); |
| |
| // Returns a matching backing store for the host. |
| // Returns NULL if we fail to find one. |
| static BackingStore* Lookup(RenderWidgetHost* host); |
| |
| // Removes the backing store for the host. |
| static void RemoveBackingStore(RenderWidgetHost* host); |
| |
| // Removes all backing stores. |
| static void RemoveAllBackingStores(); |
| |
| // Current size in bytes of the backing store cache. |
| static size_t MemorySize(); |
| |
| private: |
| // Not intended for instantiation. |
| BackingStoreManager() {} |
| |
| DISALLOW_COPY_AND_ASSIGN(BackingStoreManager); |
| }; |
| |
| } // namespace content |
| |
| #endif // CONTENT_BROWSER_RENDERER_HOST_BACKING_STORE_MANAGER_H_ |