CAggDrawSurface Class (Compact 2013)

3/26/2014

IDirectDrawSurface

**     CAggDrawSurface Class**

This class aggregates an IDirectDrawSurface interface.

Although DirectDraw interfaces (IDirectDraw and IDirectDrawSurface) potentially can be aggregated, this feature is not yet implemented.

Various parts of DirectShow require aggregation of the DirectDraw interfaces. In particular, the video renderer passes out media samples that expose IDirectDraw and IDirectDrawSurface. This class and the CAggDirectDraw Class class republish the methods of the DirectDraw class so that they can be aggregated.

Each member function in this class, with the exception of the constructor, CAggDrawSurface::SetDirectDrawSurface, and CAggDrawSurface::NonDelegatingQueryInterface, simply calls the corresponding method on the IDirectDrawSurface interface with the parameters passed to it.

Protected Data Members

Member	Description
m_pDirectDrawSurface	DirectDraw surface.

Member Functions

Member function	Description
CAggDrawSurface::CAggDrawSurface	Constructs a CAggDrawSurface object.
CAggDrawSurface::SetDirectDrawSurface	Sets the DirectDraw object to be aggregated by this class. This must be called before IDirectDrawSurface interface methods can be called.

Overrideable Member Functions

Member function	Description
CAggDrawSurface::NonDelegatingQueryInterface	Retrieves an interface and increments the reference count.

Implemented IDirectDrawSurface Methods

Method	Description
IDirectDrawSurface::AddOverlayDirtyRect	Not implemented.
IDirectDrawSurface::Blt	Performs a bit-block transfer.
IDirectDrawSurface::EnumAttachedSurfaces	Enumerates all the surfaces attached to a given surface.
IDirectDrawSurface::EnumOverlayZOrders	Enumerates the overlays on the specified destination. The overlays can be enumerated in front-to-back or back-to-front order.
IDirectDrawSurface::Flip	Makes the surface memory associated with the DDSCAPS_BACKBUFFER surface become associated with the FRONTBUFFER surface.
IDirectDrawSurface::GetBltStatus	Retrieves the status of a bit block transfer.
IDirectDrawSurface::GetCaps	Retrieves the capabilities of the surface.
IDirectDrawSurface::GetClipper	Retrieves the DirectDrawClipper object associated with this surface.
IDirectDrawSurface::GetColorKey	Retrieves the color key value for the DirectDrawSurface object.
IDirectDrawSurface::GetDC	Creates a GDI-compatible hDC for the surface.
IDirectDrawSurface::GetFlipStatus	Returns OK if the surface that it is called on has finished its flipping process; otherwise, returns DDERR_WASSTILLDRAWING.
IDirectDrawSurface::GetOverlayPosition	Retrieves the display coordinates of the surface, given a visible, active overlay surface (DDSCAPS_OVERLAY set).
IDirectDrawSurface::GetPalette	Retrieves the DirectDrawPalette structure associated with this surface.
IDirectDrawSurface::GetPixelFormat	Retrieves the color and pixel format of the surface.
IDirectDrawSurface::GetSurfaceDesc	Retrieves a DDSURFACEDESC structure describing the surface in its current condition.
IDirectDrawSurface::IsLost	Determines if the surface memory associated with a DirectDrawSurface object has been freed.
IDirectDrawSurface::Lock	Obtains a valid pointer to the surface memory.
IDirectDrawSurface::ReleaseDC	Releases a GDI-compatible hDC previously obtained through CAggDrawSurface::GetDC.
IDirectDrawSurface::Restore	Restores a surface that has been "lost." The surface memory associated with the DirectDrawSurface object has been freed.
IDirectDrawSurface::SetClipper	Attaches a DirectDrawClipper object to a DirectDrawSurface object.
IDirectDrawSurface::SetColorKey	Sets the color key value for the DirectDrawSurface object if the hardware supports color keys on a per-surface basis.
IDirectDrawSurface::SetOverlayPosition	Changes the display coordinates of an overlay surface.
IDirectDrawSurface::SetPalette	Not supported.
IDirectDrawSurface::Unlock	Notifies DirectDraw that the direct surface manipulations are complete.
IDirectDrawSurface::UpdateOverlay	Repositions and/or modifies the visual attributes of an overlay surface. These surfaces must have the DDSCAPS_OVERLAY bit set.
IDirectDrawSurface::UpdateOverlayZOrder	Sets an overlay's z-order. The z-order determines which overlay should be occluded when multiple overlays are displayed simultaneously.

Requirements

Header	ddraw.h, dshow.h, Streams.h
Library	ole32.lib, Ole32auth.lib, Strmbase.lib, Strmiids.lib, uuid.lib

See Also

Reference

DirectShow Classes