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IDWriteGlyphRunAnalysis::GetAlphaBlendParams method

Gets alpha blending properties required for ClearType blending.

Syntax


virtual HRESULT GetAlphaBlendParams(
        IDWriteRenderingParams * renderingParams,
  [out] FLOAT                  * blendGamma,
  [out] FLOAT                  * blendEnhancedContrast,
  [out] FLOAT                  * blendClearTypeLevel
) = 0;

Parameters

renderingParams

Type: IDWriteRenderingParams*

An object that specifies the ClearType level and enhanced contrast, gamma, pixel geometry, and rendering mode. In most cases, the values returned by the output parameters of this method are based on the properties of this object, unless a GDI-compatible rendering mode was specified.

blendGamma [out]

Type: FLOAT*

When this method returns, contains the gamma value to use for gamma correction.

blendEnhancedContrast [out]

Type: FLOAT*

When this method returns, contains the enhanced contrast value to be used for blending.

blendClearTypeLevel [out]

Type: FLOAT*

When this method returns, contains the ClearType level used in the alpha blending.

Return value

Type: HRESULT

If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.

Requirements

Minimum supported client

Windows 7, Windows Vista with SP2 and Platform Update for Windows Vista [desktop apps | Windows Store apps]

Minimum supported server

Windows Server 2008 R2, Windows Server 2008 with SP2 and Platform Update for Windows Server 2008 [desktop apps | Windows Store apps]

Minimum supported phone

Windows Phone 8.1 [Windows Phone Silverlight 8.1 and Windows Runtime apps]

Header

Dwrite.h

Library

Dwrite.lib

DLL

Dwrite.dll

See also

IDWriteGlyphRunAnalysis

 

 

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