// iddcx.h

typedef enum IDDCX_GAMMARAMP_TYPE {
  IDDCX_GAMMARAMP_TYPE_UNINITIALIZED = 0,
  IDDCX_GAMMARAMP_TYPE_DEFAULT = 1,
  IDDCX_GAMMARAMP_TYPE_RGB256x3x16 = 2,
  IDDCX_GAMMARAMP_TYPE_3x4_COLORSPACE_TRANSFORM = 3
} ;
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Windows Driver Kit DDI reference (ne-iddcx-iddcx_gammaramp_type)

IDDCX_GAMMARAMP_TYPE enumeration

Description

A IDDCX_GAMMARAMP_TYPE value indicates the type of gamma ramp being set.

Constants

`IDDCX_GAMMARAMP_TYPE_UNINITIALIZED:0`

Indicates that an IDDCX_GAMMARAMP_TYPE variable has not yet been assigned a meaningful value.

`IDDCX_GAMMARAMP_TYPE_DEFAULT:1`

The gamma ramp is the default ramp.

`IDDCX_GAMMARAMP_TYPE_RGB256x3x16:2`

The gamma lookup table that pGammaRampData points to contains an array of IDDCX_GAMMARAMP_RGB256x3x16 structures.

`IDDCX_GAMMARAMP_TYPE_3x4_COLORSPACE_TRANSFORM:3`

The gamma lookup table that pGammaRampData points to contains an array of IDDCX_GAMMARAMP_3X4_COLORSPACE_TRANSFORM structures. Available starting in Windows 11, version 22H2 September Update (IddCx version 1.10).

Remarks

For more information about HDR support, see IddCx version 1.10 updates.

IDDCX_GAMMARAMP_TYPE - NtDoc