CAggDirectDraw Class

Article
11/18/2015

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4/8/2010

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This class aggregates an IDirectDraw interface. Although DirectDraw interfaces (IDirectDraw and IDirectDrawSurface) potentially have the ability to 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 CAggDrawSurface 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, SetDirectDraw, and NonDelegatingQueryInterface, simply calls the corresponding method on the IDirectDraw interface with the parameters passed to it.

Protected Data Members

Member	Description
m_pDirectDraw	DirectDraw object.

Member Functions

Function	Description
CAggDirectDraw	Constructs a CAggDirectDraw object.
SetDirectDraw	Sets the DirectDraw object to be aggregated by this class.

Overrideable Member Functions

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

Implemented IDirectDraw Methods

Method	Description
IDirectDraw::CreateClipper	Creates a DirectDrawClipper object.
IDirectDraw::CreateSurface	Creates a DirectDrawSurface object for this DirectDraw object.
IDirectDraw::EnumDisplayModes	Enumerates all display modes the hardware exposes through the DirectDraw object that are compatible with a provided surface description.
IDirectDraw::EnumSurfaces	Enumerates all existing or possible surfaces that meet the search criterion specified.
IDirectDraw::FlipToGDISurface	Makes the surface that GDI writes to the primary surface.
IDirectDraw::GetCaps	Fills in the raw (not remaining) capabilities of the device driver (the hardware) and/or the Hardware Emulation Layer (HEL).
IDirectDraw::GetDisplayMode	Retrieves the current display mode.
IDirectDraw::GetFourCCCodes	Gets the FOURCC codes supported by the DirectDraw object.
IDirectDraw::GetGDISurface	Retrieves the DirectDrawSurface object that currently represents the surface memory that GDI treats as the primary surface.
IDirectDraw::GetMonitorFrequency	Points to a DirectDrawSurface pointer that will be made to point to the DirectDrawSurface object currently controlling GDI's primary surface memory.
IDirectDraw::GetScanLine	Retrieves the scan line that the monitor is currently updating to the display.
IDirectDraw::GetVerticalBlankStatus	Retrieves the status of the vertical blank.
IDirectDraw::RestoreDisplayMode	Resets the mode of the display device hardware for the primary surface to what it was before the IDirectDraw::SetDisplayMode method was called.
IDirectDraw::SetCooperativeLevel	Determines the top-level behavior of the application.
IDirectDraw::SetDisplayMode	Sets the mode of the display device hardware.
IDirectDraw::WaitForVerticalBlank	Helps the caller synchronize itself with the vertical blank interval.

Requirements

Windows Embedded CE	Windows CE 2.12 and later
Windows Mobile	Windows Mobile Version 5.0 and later
Note	Microsoft DirectShow applications and DirectShow filters have different include file and Library requirements For more information, see Setting Up the Build Environment

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