DDPIXELFORMAT
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4/8/2010
This structure describes the pixel format of a DirectDrawSurface object for the IDirectDrawSurface::GetPixelFormat method.
Syntax
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
| Header | ddraw.h |
| Windows Embedded CE | Windows Embedded CE 6.0 and later |
| Windows Mobile | Pocket PC for Windows Mobile Version 5.0 and later, Smartphone for Windows Mobile Version 5.0 and later |