Share via

DDPIXELFORMAT

  • Article

Send Feedback

This structure describes the pixel format of a DirectDrawSurface object for the IDirectDrawSurface::GetPixelFormat method.

typedef struct _DDPIXELFORMAT {
  DWORD dwSize;
  DWORD dwFlags;
  DWORD dwFourCC;
  union
  {
    DWORD dwRGBBitCount;
    DWORD dwYUVBitCount;
    DWORD dwAlphaBitDepth;
  };
  union
  {
    DWORD dwRBitMask;
    DWORD dwYBitMask;
  };
  union
  {
    DWORD dwGBitMask;
    DWORD dwUBitMask;
  };
  union
  {
    DWORD dwBBitMask;
    DWORD dwVBitMask;
  };
  union
  {
    DWORD dwRGBAlphaBitMask;
  };
} DDPIXELFORMAT, FAR* LPDDPIXELFORMAT;

Members

  • dwSize
    Specifies the size, in bytes, of the DDPIXELFORMAT structure.

    This member must be initialized before the structure is used.

  • dwFlags
    Set of flags that specify optional control flags.

    This member is a bitwise OR of any of the flags shown in the following table.

    Flag Description
    DDPF_ALPHA The pixel format describes an alpha-only surface.
    DDPF_ALPHAPIXELS The surface has alpha channel information in the pixel format.
    DDPF_ALPHAPREMULT The color components in the pixel are premultiplied by the alpha value in the pixel.

    If this flag is set, the DDPF_ALPHAPIXELS flag must also be set.

    If this flag is not set but the DDPF_ALPHAPIXELS flag is set, the color components in the pixel format are not premultiplied by alpha.

    In this case, the color components must be multiplied by the alpha value at the time that an alpha-blending operation is performed.
    DDPF_FOURCC The FourCC code is valid.
    DDPF_PALETTEINDEXED Unsupported.
    DDPF_RGB The RGB data in the pixel format structure is valid.

  • dwFourCC
    Specifies the FourCC code.

  • dwRGBBitCount
    Specifies the number of RGB bits per pixel (4, 8, 16, 24, or 32).

  • dwYUVBitCount
    Specifies the number of YUV bits per pixel.

  • dwAlphaBitDepth
    Specifies the Alpha channel bit depth.

  • dwRBitMask
    Specifies the mask for red bits.

  • dwYBitMask
    Specifies the mask for Y bits.

  • dwGBitMask
    Specifies the mask for green bits.

  • dwUBitMask
    Not supported.

  • dwBBitMask
    Specifies the mask for blue bits.

  • dwVBitMask
    Not supported

  • dwRGBAlphaBitMask
    Specify the masks for alpha channel.

Requirements

Pocket PC: Windows Mobile 5.0 and later
Smartphone: Windows Mobile 5.0 and later
OS Versions: Windows CE 5.01 and later
Header: Ddraw.h.

See Also

Creating an Off-Screen Surface

Send Feedback on this topic to the authors

Feedback FAQs

© 2006 Microsoft Corporation. All rights reserved.