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IDirectDrawGammaControl interface (ddraw.h)

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Applications use the methods of the IDirectDrawGammaControl interface to adjust the red, green, and blue gamma ramp levels of the primary surface. This section is a reference to the methods of this interface.

Inheritance

The IDirectDrawGammaControl interface inherits from the IUnknown interface. IDirectDrawGammaControl also has these types of members:

Methods

The IDirectDrawGammaControl interface has these methods.

 
IDirectDrawGammaControl::GetGammaRamp

Retrieves the red, green, and blue gamma ramps for the primary surface.
IDirectDrawGammaControl::SetGammaRamp

Sets the red, green, and blue gamma ramps for the primary surface.

Remarks

The IDirectDrawGammaControl interface is supported by DirectDrawSurface objects. That is, you can retrieve a pointer to the IDirectDrawGammaControl interface by calling the IUnknown::QueryInterface method of a DirectDrawSurface object and by specifying the IID_IDirectDrawGammaControl reference identifier in the riid parameter.

You can use the LPDIRECTDRAWGAMMACONTROL data type to declare a variable that contains a pointer to an IDirectDrawGammaControl interface. The Ddraw.h header file declares the data type with the following code:


typedef struct IDirectDrawGammaControl    FAR *LPDIRECTDRAWGAMMACONTROL;

Requirements

Requirement Value
Target Platform Windows
Header ddraw.h