cc/output/context_provider.h

   1 // Copyright (c) 2013 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 CC_OUTPUT_CONTEXT_PROVIDER_H_
   6 #define CC_OUTPUT_CONTEXT_PROVIDER_H_
   7
   8 #include "base/callback.h"
   9 #include "base/memory/ref_counted.h"
  10
  11 class GrContext;
  12 namespace WebKit { class WebGraphicsContext3D; }
  13
  14 namespace cc {
  15 struct ManagedMemoryPolicy;
  16
  17 class ContextProvider : public base::RefCountedThreadSafe<ContextProvider> {
  18  public:
  19   // Bind the 3d context to the current thread. This should be called before
  20   // accessing the contexts. Calling it more than once should have no effect.
  21   // Once this function has been called, the class should only be accessed
  22   // from the same thread.
  23   virtual bool BindToCurrentThread() = 0;
  24
  25   virtual WebKit::WebGraphicsContext3D* Context3d() = 0;
  26   virtual class GrContext* GrContext() = 0;
  27
  28   // Ask the provider to check if the contexts are valid or lost. If they are,
  29   // this should invalidate the provider so that it can be replaced with a new
  30   // one.
  31   virtual void VerifyContexts() = 0;
  32
  33   // A method to be called from the main thread that should return true if
  34   // the context inside the provider is no longer valid.
  35   virtual bool DestroyedOnMainThread() = 0;
  36
  37   // Sets a callback to be called when the context is lost. This should be
  38   // called from the same thread that the context is bound to. To avoid races,
  39   // it should be called before BindToCurrentThread(), or VerifyContexts()
  40   // should be called after setting the callback.
  41   typedef base::Closure LostContextCallback;
  42   virtual void SetLostContextCallback(
  43       const LostContextCallback& lost_context_callback) = 0;
  44
  45   // Sets a callback to be called when the context is lost. This should be
  46   // called from the same thread that the context is bound to.
  47   typedef base::Closure SwapBuffersCompleteCallback;
  48   virtual void SetSwapBuffersCompleteCallback(
  49       const SwapBuffersCompleteCallback& swap_buffers_complete_callback) = 0;
  50
  51   // Sets a callback to be called when the memory policy changes. This should be
  52   // called from the same thread that the context is bound to.
  53   typedef base::Callback<void(
  54     const cc::ManagedMemoryPolicy& policy,
  55     bool discard_backbuffer_when_not_visible)> MemoryPolicyChangedCallback;
  56   virtual void SetMemoryPolicyChangedCallback(
  57       const MemoryPolicyChangedCallback& memory_policy_changed_callback) = 0;
  58
  59  protected:
  60   friend class base::RefCountedThreadSafe<ContextProvider>;
  61   virtual ~ContextProvider() {}
  62 };
  63
  64 }  // namespace cc
  65
  66 #endif  // CC_OUTPUT_CONTEXT_PROVIDER_H_