1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/layers/d3d10/ReadbackManagerD3D10.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,75 @@
1.4 +/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#ifndef GFX_READBACKMANAGERD3D10_H
1.10 +#define GFX_READBACKMANAGERD3D10_H
1.11 +
1.12 +#include <windows.h>
1.13 +#include <d3d10_1.h>
1.14 +
1.15 +#include "nsTArray.h"
1.16 +#include "nsAutoPtr.h"
1.17 +#include "gfxPoint.h"
1.18 +
1.19 +namespace mozilla {
1.20 +namespace layers {
1.21 +
1.22 +DWORD WINAPI StartTaskThread(void *aManager);
1.23 +
1.24 +struct ReadbackTask;
1.25 +
1.26 +class ReadbackManagerD3D10 MOZ_FINAL : public IUnknown
1.27 +{
1.28 +public:
1.29 + ReadbackManagerD3D10();
1.30 + ~ReadbackManagerD3D10();
1.31 +
1.32 + /**
1.33 + * Tell the readback manager to post a readback task.
1.34 + *
1.35 + * @param aTexture D3D10_USAGE_STAGING texture that will contain the data that
1.36 + * was readback.
1.37 + * @param aUpdate ReadbackProcessor::Update object. This is a void pointer
1.38 + * since we cannot forward declare a nested class, and do not
1.39 + * export ReadbackProcessor.h
1.40 + * @param aOrigin Origin of the aTexture surface in the ThebesLayer
1.41 + * coordinate system.
1.42 + */
1.43 + void PostTask(ID3D10Texture2D *aTexture, void *aUpdate, const gfxPoint &aOrigin);
1.44 +
1.45 + virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid,
1.46 + void **ppvObject);
1.47 + virtual ULONG STDMETHODCALLTYPE AddRef(void);
1.48 + virtual ULONG STDMETHODCALLTYPE Release(void);
1.49 +
1.50 +private:
1.51 + friend DWORD WINAPI StartTaskThread(void *aManager);
1.52 +
1.53 + void ProcessTasks();
1.54 +
1.55 + // The invariant maintained by |mTaskSemaphore| is that the readback thread
1.56 + // will awaken from WaitForMultipleObjects() at least once per readback
1.57 + // task enqueued by the main thread. Since the readback thread processes
1.58 + // exactly one task per wakeup (with one exception), no tasks are lost. The
1.59 + // exception is when the readback thread is shut down, which orphans the
1.60 + // remaining tasks, on purpose.
1.61 + HANDLE mTaskSemaphore;
1.62 + // Event signaled when the task thread should shutdown
1.63 + HANDLE mShutdownEvent;
1.64 + // Handle to the task thread
1.65 + HANDLE mTaskThread;
1.66 +
1.67 + // FiFo list of readback tasks that are to be executed. Access is synchronized
1.68 + // by mTaskMutex.
1.69 + CRITICAL_SECTION mTaskMutex;
1.70 + nsTArray<nsAutoPtr<ReadbackTask>> mPendingReadbackTasks;
1.71 +
1.72 + ULONG mRefCnt;
1.73 +};
1.74 +
1.75 +}
1.76 +}
1.77 +
1.78 +#endif /* GFX_READBACKMANAGERD3D10_H */
