IDWriteGlyphRunAnalysis::GetAlphaBlendParams method (dwrite.h)

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

See also

IDWriteGlyphRunAnalysis