IOverlay::GetDefaultColorKey

  • 项目

This method retrieves the default color key used for a chroma key overlay.

HRESULT GetDefaultColorKey(
  COLORKEY* pColorKey
);

Parameters

  • pColorKey
    [out] Pointer to where the default color key is copied.

Return Values

Returns an HRESULT value that depends on the implementation. HRESULT can be one of the following standard constants, or other values not listed.

Value Description
E_FAIL Failure.
E_POINTER Null pointer argument.
E_INVALIDARG Invalid argument.
E_NOTIMPL Method is not supported.
S_OK or NOERROR Success.

Remarks

A filter using color keys can get a default color from the video renderer. The default color key can then be installed into the window using IOverlay::SetColorKey. The colors returned through this method vary depending on the current display mode. If the colors are 8-bit palettized, they will be bright system colors (such as magenta). If the display is in a true-color mode, they will be shades of black.

The IOverlay interface ensures that separate instances of the renderer on the same computer get different color keys so that overlays do not conflict.

Requirements

DirectShow applications and DirectShow filters have different include file and link library requirements. See Setting Up the Build Environment for more information.

OS Versions: Windows CE 2.12 and later. Version 2.12 requires DXPAK 1.0 or later.

See Also

IOverlay Interface

Last updated on Wednesday, April 13, 2005

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