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The IDXBaseObject interface manages the generation ID of an object.
Members
The IDXBaseObject interface inherits from the IUnknown interface. IDXBaseObject also has these types of members:
- Methods
Methods
The IDXBaseObject interface has these methods.
| Method | Description |
|---|---|
| GetGenerationId | Retrieves the current generation ID for the object. |
| GetObjectSize | Retrieves the size, in bytes, of the data object (for example, a surface or buffer). |
| IncrementGenerationId | Manually increments the object generation ID. |
Remarks
Every time an operation changes the state of an object, the generation ID is incremented. The following are examples of operations that change the generation IDs of objects.
- Locking a surface with a read/write pointer.
- Setting up a transform.
- Changing the properties of a transform.
- Changing the properties of a procedural surface.
When calling the IDXBaseObject::GetGenerationId method for a transform, the transform examines the generation IDs of all inputs. If they have changed, the transform's generation ID changes. If the ID has not changed since the last time a transform was executed or a surface was used, this indicates that the data has not changed. It is then possible to skip execution of a transform Setup or the copying of a surface.
The IDXBaseObject interface is exposed on DXSurface objects and DXTransform objects.
Requirements
Minimum supported client |
Windows XP |
Minimum supported server |
Windows 2000 Server |
Header |
Dxtrans.h |
IDL |
Dxtrans.idl |
DLL |
Dxtrans.dll |