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CImageDisplay::CountPrefixBits

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Microsoft DirectShow 9.0

CImageDisplay::CountPrefixBits

The CountPrefixBits method calculates the number of zero bits at the start of a specified bit field.

Syntax

  DWORD CountPrefixBits(
    const DWORD Field
);

Parameters

Field

Specifies a bit field as a DWORD value.

Return Value

Returns the number of zero bits that occur before the first 1 bit, or 0x80000000 if all bits are zero.

Remarks

This method is useful for working with color masks in VIDEOINFO structures.

Requirements

**  Header:** Declared in Winutil.h; include Streams.h.

**  Library:** Use Strmbase.lib (retail builds) or Strmbasd.lib (debug builds).

See Also