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 CONTENT_RENDERER_RENDER_PROCESS_IMPL_H_ 6 #define CONTENT_RENDERER_RENDER_PROCESS_IMPL_H_ 7 8 #include "base/timer/timer.h" 9 #include "content/renderer/render_process.h" 10 11 class SkCanvas; 12 13 namespace content { 14 15 // Implementation of the RenderProcess interface for the regular browser. 16 // See also MockRenderProcess which implements the active "RenderProcess" when 17 // running under certain unit tests. 18 class RenderProcessImpl : public RenderProcess { 19 public: 20 RenderProcessImpl(); 21 virtual ~RenderProcessImpl(); 22 23 // RenderProcess implementation. 24 virtual SkCanvas* GetDrawingCanvas( 25 TransportDIB** memory, 26 const gfx::Rect& rect) OVERRIDE; 27 virtual void ReleaseTransportDIB(TransportDIB* memory) OVERRIDE; 28 virtual bool UseInProcessPlugins() const OVERRIDE; 29 virtual void AddBindings(int bindings) OVERRIDE; 30 virtual int GetEnabledBindings() const OVERRIDE; 31 virtual TransportDIB* CreateTransportDIB(size_t size) OVERRIDE; 32 virtual void FreeTransportDIB(TransportDIB*) OVERRIDE; 33 34 // Like UseInProcessPlugins(), but called before RenderProcess is created 35 // and does not allow overriding by tests. This just checks the command line 36 // each time. 37 static bool InProcessPlugins(); 38 39 private: 40 // Look in the shared memory cache for a suitable object to reuse. 41 // result: (output) the memory found 42 // size: the resulting memory will be >= this size, in bytes 43 // returns: false if a suitable DIB memory could not be found 44 bool GetTransportDIBFromCache(TransportDIB** result, size_t size); 45 46 // Maybe put the given shared memory into the shared memory cache. Returns 47 // true if the SharedMemory object was stored in the cache; otherwise, false 48 // is returned. 49 bool PutSharedMemInCache(TransportDIB* memory); 50 51 void ClearTransportDIBCache(); 52 53 // Return the index of a free cache slot in which to install a transport DIB 54 // of the given size. If all entries in the cache are larger than the given 55 // size, this doesn't free any slots and returns -1. 56 int FindFreeCacheSlot(size_t size); 57 58 // A very simplistic and small cache. If an entry in this array is non-null, 59 // then it points to a SharedMemory object that is available for reuse. 60 TransportDIB* shared_mem_cache_[2]; 61 62 // This DelayTimer cleans up our cache 5 seconds after the last use. 63 base::DelayTimer<RenderProcessImpl> shared_mem_cache_cleaner_; 64 65 // TransportDIB sequence number 66 uint32 transport_dib_next_sequence_number_; 67 68 bool in_process_plugins_; 69 70 // Bitwise-ORed set of extra bindings that have been enabled anywhere in this 71 // process. See BindingsPolicy for details. 72 int enabled_bindings_; 73 74 DISALLOW_COPY_AND_ASSIGN(RenderProcessImpl); 75 }; 76 77 } // namespace content 78 79 #endif // CONTENT_RENDERER_RENDER_PROCESS_IMPL_H_ 80