IVMRMixerBitmap9 interface (vmr9.h)
[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
The IVMRMixerBitmap9 interface enables an application to blend a static image from a bitmap or Direct3D surface onto the video stream, when using the Video Mixing Renderer Filter 9 (VMR-9).
You can pass images to the VMR as frequently as you like, but changing the image several times per second may impact the performance and smoothness of the video being rendered. The new image will be blended with the next and all subsequent video frames rendered by the VMR.
Internally, the VMR uses its mixer component to perform the blending operation. In the VMR-9, the mixer is always present by default except in "renderless" mode in which the application is performing its own rendering. The image can contain embedded per pixel alpha information; this allows the image to contain regions that are transparent. Transparent areas can also be identified by a color key value. Changes in the image are only shown on the screen while the filter graph is running.
Inheritance
The IVMRMixerBitmap9 interface inherits from the IUnknown interface. IVMRMixerBitmap9 also has these types of members:
Methods
The IVMRMixerBitmap9 interface has these methods.
| IVMRMixerBitmap9::GetAlphaBitmapParameters The GetAlphaBitmapParameters method retrieves a copy of the current image and related blending parameters. |
| IVMRMixerBitmap9::SetAlphaBitmap The SetAlphaBitmap method specifies a new bitmap image and the source location of the bitmap and how and where it should be rendered on the destination rectangle. |
| IVMRMixerBitmap9::UpdateAlphaBitmapParameters The UpdateAlphaBitmapParameters method changes the bitmap location, size and blending value. |
Remarks
Include DShow.h and D3d9.h before Vmr9.h.
Requirements
| Minimum supported client | Windows XP with SP2 [desktop apps only] |
| Minimum supported server | Windows Server 2003 R2 [desktop apps only] |
| Target Platform | Windows |
| Header | vmr9.h |
See also
Displaying an Application-Supplied Bitmap on the Composited Image