WICDdsAlphaMode enumeration (wincodec.h)

Specifies the meaning of pixel color component values contained in the DDS image.

Syntax

typedef enum WICDdsAlphaMode {
  WICDdsAlphaModeUnknown = 0,
  WICDdsAlphaModeStraight = 0x1,
  WICDdsAlphaModePremultiplied = 0x2,
  WICDdsAlphaModeOpaque = 0x3,
  WICDdsAlphaModeCustom = 0x4,
  WICDDSALPHAMODE_FORCE_DWORD = 0x7fffffff
} ;

Constants

WICDdsAlphaModeUnknown Value: 0 Alpha behavior is unspecified and must be determined by the reader.
WICDdsAlphaModeStraight Value: 0x1 The alpha data is straight.
WICDdsAlphaModePremultiplied Value: 0x2 The alpha data is premultiplied.
WICDdsAlphaModeOpaque Value: 0x3 The alpha data is opaque (UNORM value of 1). This can be used by a compliant reader as a performance optimization. For example, blending operations can be converted to copies.
WICDdsAlphaModeCustom Value: 0x4 The alpha channel contains custom data that is not alpha.
WICDDSALPHAMODE_FORCE_DWORD Value: 0x7fffffff

Requirements

Requirement	Value
Minimum supported client	Windows 8.1 [desktop apps | UWP apps]
Minimum supported server	Windows Server 2012 R2 [desktop apps | UWP apps]
Header	wincodec.h

See also

IWICDdsDecoder::GetParameters

WICDdsParameters