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WICDdsAlphaMode enumeration (wincodec.h)

  • Article

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