fuchsia.hardware.backlight

PROTOCOLS

Device

Defined in fuchsia.hardware.backlight/backlight.fidl

GetMaxAbsoluteBrightness

Gets the maximum supported backlight brightness in nits, if known. Otherwise returns error ZX_ERR_NOT_SUPPORTED.

Request

<EMPTY>

Response

Name	Type
`result`	`Device_GetMaxAbsoluteBrightness_Result`

GetNormalizedBrightnessScale

Gets the current normalized brightness scale as a percentage value in [0.0, 1.0].

Request

<EMPTY>

Response

Name	Type
`result`	`Device_GetNormalizedBrightnessScale_Result`

GetStateAbsolute

Gets the current backlight brightness in nits

Request

<EMPTY>

Response

Name	Type
`result`	`Device_GetStateAbsolute_Result`

GetStateNormalized

Gets the current backlight brightness as a percentage value between 0.0 and 1.0

Request

<EMPTY>

Response

Name	Type
`result`	`Device_GetStateNormalized_Result`

SetNormalizedBrightnessScale

Scales the maximum normalized brightness by a percentage value in [0.0, 1.0], if supported. Otherwise returns error ZX_ERR_NOT_SUPPORTED. Values passed to SetStateNormalized will correspond to a maximum brightness of scale * GetMaxAbsoluteBrightness(). Calling this may change the current absolute brightness.

Request

Name	Type
`scale`	`float64`

Response

Name	Type
`result`	`Device_SetNormalizedBrightnessScale_Result`

SetStateAbsolute

Sets the current backlight brightness in nits. Not affected by the scale set by SetNormalizedBrightnessScale.

Request

Name	Type
`state`	`State`

Response

Name	Type
`result`	`Device_SetStateAbsolute_Result`

SetStateNormalized

Sets the current backlight brightness as a percentage value between 0.0 and 1.0

Request

Name	Type
`state`	`State`

Response

Name	Type
`result`	`Device_SetStateNormalized_Result`

STRUCTS

Device_GetMaxAbsoluteBrightness_Response

Defined in fuchsia.hardware.backlight/backlight.fidl

Field	Type	Description	Default
`max_brightness`	`float64`		No default

Device_GetNormalizedBrightnessScale_Response

Defined in fuchsia.hardware.backlight/backlight.fidl

Field	Type	Description	Default
`scale`	`float64`		No default

Device_GetStateAbsolute_Response

Defined in fuchsia.hardware.backlight/backlight.fidl

Field	Type	Description	Default
`state`	`State`		No default

Device_GetStateNormalized_Response

Defined in fuchsia.hardware.backlight/backlight.fidl

Field	Type	Description	Default
`state`	`State`		No default

Device_SetNormalizedBrightnessScale_Response

Defined in fuchsia.hardware.backlight/backlight.fidl

<EMPTY>

Device_SetStateAbsolute_Response

Defined in fuchsia.hardware.backlight/backlight.fidl

<EMPTY>

Device_SetStateNormalized_Response

Defined in fuchsia.hardware.backlight/backlight.fidl

<EMPTY>

State

Defined in fuchsia.hardware.backlight/backlight.fidl

Field Type Description Default

backlight_on bool No default

Field	Type	Description	Default
`backlight_on`	`bool`		No default
`brightness`	`float64`	`brightness` can either be: The unitless brightness value on a linear scale where 0.0 is the minimum brightness and 1.0 is the maximum brightness - represents the current / desired brightness as a percentage within the supported range. Used by the `GetStateNormalized` / `SetStateNormalized` calls. The maximum brightness that can be set using `SetStateNormalized` is GetBrightnessScale() * GetMaxAbsoluteBrightness(). Absolute brightness in nits. Used by the `GetStateAbsolute` / `SetStateAbsolute` calls.	No default

brightness

float64

brightness can either be:

The unitless brightness value on a linear scale where 0.0 is the minimum brightness and 1.0 is the maximum brightness - represents the current / desired brightness as a percentage within the supported range. Used by the GetStateNormalized / SetStateNormalized calls. The maximum brightness that can be set using SetStateNormalized is GetBrightnessScale() * GetMaxAbsoluteBrightness().
Absolute brightness in nits. Used by the GetStateAbsolute / SetStateAbsolute calls.

No default

UNIONS

Device_GetMaxAbsoluteBrightness_Result strict

Defined in fuchsia.hardware.backlight/backlight.fidl

Ordinal
Variant	Type	Description
1	`response`	`Device_GetMaxAbsoluteBrightness_Response`
2	`err`	`zx/status`

Device_GetNormalizedBrightnessScale_Result strict

Defined in fuchsia.hardware.backlight/backlight.fidl

Ordinal
Variant	Type	Description
1	`response`	`Device_GetNormalizedBrightnessScale_Response`
2	`err`	`zx/status`

Device_GetStateAbsolute_Result strict

Defined in fuchsia.hardware.backlight/backlight.fidl

Ordinal
Variant	Type	Description
1	`response`	`Device_GetStateAbsolute_Response`
2	`err`	`zx/status`

Device_GetStateNormalized_Result strict

Defined in fuchsia.hardware.backlight/backlight.fidl

Ordinal
Variant	Type	Description
1	`response`	`Device_GetStateNormalized_Response`
2	`err`	`zx/status`

Device_SetNormalizedBrightnessScale_Result strict

Defined in fuchsia.hardware.backlight/backlight.fidl

Ordinal
Variant	Type	Description
1	`response`	`Device_SetNormalizedBrightnessScale_Response`
2	`err`	`zx/status`

Device_SetStateAbsolute_Result strict

Defined in fuchsia.hardware.backlight/backlight.fidl

Ordinal
Variant	Type	Description
1	`response`	`Device_SetStateAbsolute_Response`
2	`err`	`zx/status`

Device_SetStateNormalized_Result strict

Defined in fuchsia.hardware.backlight/backlight.fidl

Ordinal
Variant	Type	Description
1	`response`	`Device_SetStateNormalized_Response`
2	`err`	`zx/status`