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IDWriteGlyphRunAnalysis::GetAlphaBlendParams method (dwrite.h)

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Gets alpha blending properties required for ClearType blending.

Syntax

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

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.

[out] blendGamma

Type: FLOAT*

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

[out] blendEnhancedContrast

Type: FLOAT*

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

[out] blendClearTypeLevel

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

Requirement Value
Minimum supported client Windows 7, Windows Vista with SP2 and Platform Update for Windows Vista [desktop apps | UWP apps]
Minimum supported server Windows Server 2008 R2, Windows Server 2008 with SP2 and Platform Update for Windows Server 2008 [desktop apps | UWP apps]
Target Platform Windows
Header dwrite.h
Library Dwrite.lib
DLL Dwrite.dll

See also

IDWriteGlyphRunAnalysis