Editar

MFVideoAlphaBitmapFlags enumeration (evr9.h)

  • Artículo
  • Tiempo de lectura: 2 minutos

Defines flags for the MFVideoAlphaBitmapParams structure.

Syntax

typedef enum __MIDL___MIDL_itf_evr9_0000_0002_0002 {
  MFVideoAlphaBitmap_EntireDDS = 0x1,
  MFVideoAlphaBitmap_SrcColorKey = 0x2,
  MFVideoAlphaBitmap_SrcRect = 0x4,
  MFVideoAlphaBitmap_DestRect = 0x8,
  MFVideoAlphaBitmap_FilterMode = 0x10,
  MFVideoAlphaBitmap_Alpha = 0x20,
  MFVideoAlphaBitmap_BitMask = 0x3f
} MFVideoAlphaBitmapFlags;

Constants

 
MFVideoAlphaBitmap_EntireDDS
Value: 0x1
Alpha-blend the entire DirectDraw surface.

If you are alpha-blending a DirectDraw surface, you can set this flag when you call IMFVideoMixerBitmap::SetAlphaBitmap. If this flag is set, the mixer ignores the rcSrc member of the MFVideoAlphaBitmapParams structure. If this flag is absent, the rcSrc member specifies the source rectangle.

This flag cannot be used if you specify a GDI bitmap for alpha-blending. For a GDI bitmap, you must fill in the rcSrc member when you call SetAlphaBitmap.

This flag does not apply to the IMFVideoMixerBitmap::UpdateAlphaBitmapParameters method.
MFVideoAlphaBitmap_SrcColorKey
Value: 0x2
If this flag is set, the clrSrcKey member of the MFVideoAlphaBitmapParams structure specifies a color key for alpha-blending. If this flag is absent, the clrSrcKey member is ignored.

This flag is not valid if you are alpha-blending a Direct3D surface with per-pixel alpha (D3DFMT_A8R8G8B8). When the DirectDraw surface has per-pixel alpha, the pixel alpha values are used for the alpha-blending operation.
MFVideoAlphaBitmap_SrcRect
Value: 0x4
Update the source rectangle.

This flag applies to the UpdateAlphaBitmapParameters method. If this flag is set, the rcSrc member of the MFVideoAlphaBitmapParams structure updates the source rectangle. If this flag is absent, the rcSrc member is ignored. By setting this flag, you can animate the image by selecting different portions of the bitmap.

This flag does not apply to the SetAlphaBitmap method.
MFVideoAlphaBitmap_DestRect
Value: 0x8
If this flag is set, the nrcDest member of the MFVideoAlphaBitmapParams structure specifies a normalized rectangle for scaling the bitmap. If this flag is absent, the nrcDest member is ignored.
MFVideoAlphaBitmap_FilterMode
Value: 0x10
If this flag is set, the dwFilterMode member of the MFVideoAlphaBitmapParams structure specifies a Direct3D filtering mode. If this flag is absent, the dwFilterMode member is ignored.
MFVideoAlphaBitmap_Alpha
Value: 0x20
If this flag is set, the fAlpha member of the MFVideoAlphaBitmapParams structure specifies an alpha value to apply to the entire image. If this flag is absent, the fAlpha member is ignored.
MFVideoAlphaBitmap_BitMask
Value: 0x3f
Bitmask to validate flag values. This value is not a valid flag.

Requirements

   
Minimum supported client Windows Vista [desktop apps only]
Minimum supported server Windows Server 2008 [desktop apps only]
Header evr9.h

See also

Enhanced Video Renderer

Media Foundation Enumerations