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comparison: gfx/layers/d3d10/ReadbackManagerD3D10.h
gfx/layers/d3d10/ReadbackManagerD3D10.h
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| 1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- | |
| 2 * This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #ifndef GFX_READBACKMANAGERD3D10_H | |
| 7 #define GFX_READBACKMANAGERD3D10_H | |
| 8 | |
| 9 #include <windows.h> | |
| 10 #include <d3d10_1.h> | |
| 11 | |
| 12 #include "nsTArray.h" | |
| 13 #include "nsAutoPtr.h" | |
| 14 #include "gfxPoint.h" | |
| 15 | |
| 16 namespace mozilla { | |
| 17 namespace layers { | |
| 18 | |
| 19 DWORD WINAPI StartTaskThread(void *aManager); | |
| 20 | |
| 21 struct ReadbackTask; | |
| 22 | |
| 23 class ReadbackManagerD3D10 MOZ_FINAL : public IUnknown | |
| 24 { | |
| 25 public: | |
| 26 ReadbackManagerD3D10(); | |
| 27 ~ReadbackManagerD3D10(); | |
| 28 | |
| 29 /** | |
| 30 * Tell the readback manager to post a readback task. | |
| 31 * | |
| 32 * @param aTexture D3D10_USAGE_STAGING texture that will contain the data that | |
| 33 * was readback. | |
| 34 * @param aUpdate ReadbackProcessor::Update object. This is a void pointer | |
| 35 * since we cannot forward declare a nested class, and do not | |
| 36 * export ReadbackProcessor.h | |
| 37 * @param aOrigin Origin of the aTexture surface in the ThebesLayer | |
| 38 * coordinate system. | |
| 39 */ | |
| 40 void PostTask(ID3D10Texture2D *aTexture, void *aUpdate, const gfxPoint &aOrigin); | |
| 41 | |
| 42 virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, | |
| 43 void **ppvObject); | |
| 44 virtual ULONG STDMETHODCALLTYPE AddRef(void); | |
| 45 virtual ULONG STDMETHODCALLTYPE Release(void); | |
| 46 | |
| 47 private: | |
| 48 friend DWORD WINAPI StartTaskThread(void *aManager); | |
| 49 | |
| 50 void ProcessTasks(); | |
| 51 | |
| 52 // The invariant maintained by |mTaskSemaphore| is that the readback thread | |
| 53 // will awaken from WaitForMultipleObjects() at least once per readback | |
| 54 // task enqueued by the main thread. Since the readback thread processes | |
| 55 // exactly one task per wakeup (with one exception), no tasks are lost. The | |
| 56 // exception is when the readback thread is shut down, which orphans the | |
| 57 // remaining tasks, on purpose. | |
| 58 HANDLE mTaskSemaphore; | |
| 59 // Event signaled when the task thread should shutdown | |
| 60 HANDLE mShutdownEvent; | |
| 61 // Handle to the task thread | |
| 62 HANDLE mTaskThread; | |
| 63 | |
| 64 // FiFo list of readback tasks that are to be executed. Access is synchronized | |
| 65 // by mTaskMutex. | |
| 66 CRITICAL_SECTION mTaskMutex; | |
| 67 nsTArray<nsAutoPtr<ReadbackTask>> mPendingReadbackTasks; | |
| 68 | |
| 69 ULONG mRefCnt; | |
| 70 }; | |
| 71 | |
| 72 } | |
| 73 } | |
| 74 | |
| 75 #endif /* GFX_READBACKMANAGERD3D10_H */ |
