| Microsoft DirectX 8.1 (C++) |
The CImageAllocator class is inherited from the CBaseAllocator class, which allocates sample buffers in shared memory. The number, size, and alignment of blocks are determined when the connected output pin calls CImageAllocator::SetProperties (which implements IMemAllocator::SetProperties). The shared memory blocks are used in subsequent calls to the Microsoft® Win32® CreateDIBSection function. The output pin can then fill these buffers with data, and the buffers will be handed to GDI using BitBlt.
Protected Data Members
| m_pFilter | Owning filter of this object. |
| m_pMediaType | Current media type format. |
Member Functions
| Alloc | Allocates the samples through CreateDIBSection. |
| CheckSizes | Checks the allocator requirements. |
| CImageAllocator | Constructs a CImageAllocator object. |
| CreateDIB | Creates a device-independent bitmap (DIB). |
| Free | Releases and deletes the resources for any samples allocated. |
| NotifyMediaType | Notifies the allocator of the agreed media type. |
Overridable Member Functions
| CreateImageSample | Creates a sample. |
Implemented INonDelegatingUnknown Methods
| NonDelegatingAddRef | Increments the reference count for an interface. |
| NonDelegatingRelease | Decrements the reference count for an interface. |
Implemented IMemAllocator Methods
| SetProperties | Specifies the buffering requirements for the allocator. |