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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
#ifndef widget_windows_InProcessWinCompositorWidget_h
#define widget_windows_InProcessWinCompositorWidget_h
#include "WinCompositorWidget.h"
class nsWindow;
class gfxASurface;
namespace mozilla::widget {
// This is the Windows-specific implementation of CompositorWidget. For
// the most part it only requires an HWND, however it maintains extra state
// for transparent windows, as well as for synchronizing WM_SETTEXT messages
// with the compositor.
class InProcessWinCompositorWidget final
: public WinCompositorWidget,
public PlatformCompositorWidgetDelegate {
InProcessWinCompositorWidget(const WinCompositorWidgetInitData& aInitData,
const layers::CompositorOptions& aOptions,
nsWindow* aWindow);
bool PreRender(WidgetRenderingContext*) override;
void PostRender(WidgetRenderingContext*) override;
already_AddRefed<gfx::DrawTarget> StartRemoteDrawing() override;
void EndRemoteDrawing() override;
bool NeedsToDeferEndRemoteDrawing() override;
LayoutDeviceIntSize GetClientSize() override;
already_AddRefed<gfx::DrawTarget> GetBackBufferDrawTarget(
gfx::DrawTarget* aScreenTarget, const gfx::IntRect& aRect,
bool* aOutIsCleared) override;
already_AddRefed<gfx::SourceSurface> EndBackBufferDrawing() override;
bool InitCompositor(layers::Compositor* aCompositor) override;
CompositorWidgetDelegate* AsDelegate() override { return this; }
bool IsHidden() const override;
// PlatformCompositorWidgetDelegate Overrides
void EnterPresentLock() override;
void LeavePresentLock() override;
void OnDestroyWindow() override;
bool OnWindowResize(const LayoutDeviceIntSize& aSize) override;
void OnWindowModeChange(nsSizeMode aSizeMode) override;
void UpdateTransparency(TransparencyMode aMode) override;
void NotifyVisibilityUpdated(nsSizeMode aSizeMode,
bool aIsFullyOccluded) override;
void ClearTransparentWindow() override;
bool RedrawTransparentWindow();
// Ensure that a transparent surface exists, then return it.
RefPtr<gfxASurface> EnsureTransparentSurface();
HDC GetTransparentDC() const { return mMemoryDC; }
mozilla::Mutex& GetTransparentSurfaceLock() {
return mTransparentSurfaceLock;
bool HasGlass() const override;
nsSizeMode GetWindowSizeMode() const override;
bool GetWindowIsFullyOccluded() const override;
void ObserveVsync(VsyncObserver* aObserver) override;
nsIWidget* RealWidget() override;
void UpdateCompositorWnd(const HWND aCompositorWnd,
const HWND aParentWnd) override;
void SetRootLayerTreeID(const layers::LayersId& aRootLayerTreeId) override {}
HDC GetWindowSurface();
void FreeWindowSurface(HDC dc);
void CreateTransparentSurface(const gfx::IntSize& aSize);
nsWindow* mWindow;
HWND mWnd;
gfx::CriticalSection mPresentLock;
// Transparency handling.
mozilla::Mutex mTransparentSurfaceLock MOZ_UNANNOTATED;
mozilla::Atomic<uint32_t, MemoryOrdering::Relaxed> mTransparencyMode;
bool TransparencyModeIs(TransparencyMode aMode) const {
return TransparencyMode(uint32_t(mTransparencyMode)) == aMode;
// Visibility handling.
mozilla::Atomic<nsSizeMode, MemoryOrdering::Relaxed> mSizeMode;
mozilla::Atomic<bool, MemoryOrdering::Relaxed> mIsFullyOccluded;
RefPtr<gfxASurface> mTransparentSurface;
HDC mMemoryDC;
HDC mCompositeDC;
// Locked back buffer of BasicCompositor
uint8_t* mLockedBackBufferData;
bool mNotDeferEndRemoteDrawing;
} // namespace mozilla::widget
#endif // widget_windows_InProcessWinCompositorWidget_h