D2D1_PRIMITIVE_BLEND enumeration (d2d1_1.h)

Used to specify the geometric blend mode for all Direct2D primitives.

Syntax

typedef enum D2D1_PRIMITIVE_BLEND {
  D2D1_PRIMITIVE_BLEND_SOURCE_OVER,
  D2D1_PRIMITIVE_BLEND_COPY,
  D2D1_PRIMITIVE_BLEND_MIN,
  D2D1_PRIMITIVE_BLEND_ADD,
  D2D1_PRIMITIVE_BLEND_MAX,
  D2D1_PRIMITIVE_BLEND_FORCE_DWORD
} ;

Constants

Name Description
D2D1_PRIMITIVE_BLEND_SOURCE_OVER The standard source-over-destination blend mode.
D2D1_PRIMITIVE_BLEND_COPY The source is copied to the destination; the destination pixels are ignored.
D2D1_PRIMITIVE_BLEND_MIN The resulting pixel values use the minimum of the source and destination pixel values. Available in Windows 8 and later.
D2D1_PRIMITIVE_BLEND_ADD The resulting pixel values are the sum of the source and destination pixel values. Available in Windows 8 and later.
D2D1_PRIMITIVE_BLEND_MAX The resulting pixel values use the maximum of the source and destination pixel values.
Available in Windows 10 and later (set using ID21CommandSink4::SetPrimitiveBlend2).
D2D1_PRIMITIVE_BLEND_FORCE_DWORD

Remarks

Blend modes

For aliased rendering (except for MIN mode), the output value O is computed by linearly interpolating the value blend(S, D) with the destination pixel value, based on the amount that the primitive covers the destination pixel.

The table here shows the primitive blend modes for both aliased and antialiased blending. The equations listed in the table use these elements:

  • O = Output
  • S = Source
  • SA = Source Alpha
  • D = Destination
  • DA = Destination Alpha
  • C = Pixel coverage
Primitive blend mode Aliased blending Antialiased blending Description
D2D1_PRIMITIVE_BLEND_SOURCE_OVER O = (S + (1 – SA) * D) * C + D * (1 – C) O = S * C + D *(1 – SA *C) The standard source-over-destination blend mode.
D2D1_PRIMITIVE_BLEND_COPY O = S * C + D * (1 – C) O = S * C + D * (1 – C) The source is copied to the destination; the destination pixels are ignored.
D2D1_PRIMITIVE_BLEND_MIN O = Min(S + 1-SA, D) O = Min(S * C + 1 – SA *C, D) The resulting pixel values use the minimum of the source and destination pixel values. Available in Windows 8.1 and later.
D2D1_PRIMITIVE_BLEND_ADD O = (S + D) * C + D * (1 – C) O = S * C + D The resulting pixel values are the sum of the source and destination pixel values. Available in Windows 8.1 and later.
  An illustration of Direct2D primitive blend modes with varying opacity and backgrounds. An illustration of the primitive blend modes with varying opacity and backgrounds.

Requirements

   
Minimum supported client Windows 8 and Platform Update for Windows 7 [desktop apps | UWP apps]
Minimum supported server Windows Server 2012 and Platform Update for Windows Server 2008 R2 [desktop apps | UWP apps]
Header d2d1_1.h

See also

ID2D1DeviceContext::GetPrimitiveBlend

ID2D1DeviceContext::SetPrimitiveBlend