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fuchsia.accessibility

PROTOCOLS

ColorTransform

Defined in fuchsia.accessibility/color_transform.fidl

Allows a presentation owner to register a handler for color transforms. This API is implemented by the Accessibility manager and called by Root Presenter.

RegisterColorTransformHandler

Registers a handler for changes in the color transform configuration.

Request

NameType
handler ColorTransformHandler

ColorTransformHandler

Defined in fuchsia.accessibility/color_transform.fidl

Handler implemented by the owner of the presentation. Accessibility manager uses this protocol to make changes to the screen's color transform.

SetColorTransformConfiguration

Called when the color transform configuration has changed.

Request

NameType
configuration ColorTransformConfiguration

Response

NameType

MagnificationHandler

Defined in fuchsia.accessibility/magnifier.fidl

Exposes a privileged magnifier API for camera control, typically on a fuchsia.ui.policy.Presentation.

SetClipSpaceTransform

Sets clip-space x-offset, y-offset, and scale for the presentation. x and y are in Vulkan NDC and are applied after scaling, which occurs about the center of the presentation. The callback indicates when the update has been presented. The identity transform (0, 0, 1) is the natural state.

Request

NameType
x float32
y float32
scale float32

Response

NameType

Magnifier

Defined in fuchsia.accessibility/magnifier.fidl

RegisterHandler

Registers the camera control to be used for applying magnification. If a previous handler had been registered, that handler is dropped.

Request

NameType
handler MagnificationHandler

STRUCTS

ENUMS

ColorCorrectionMode

Type: uint32

Defined in fuchsia.accessibility/color_transform.fidl

Specifies color correction mode.

NameValueDescription
DISABLED 0

No color correction.

CORRECT_PROTANOMALY 1

Color correction for protanomaly (red-green -- reduced sensitivity to red light).

CORRECT_DEUTERANOMALY 2

Color correction for deuteranomaly (red-green -- reduced sensitivity to green light).

CORRECT_TRITANOMALY 3

Color correction for tritanomaly (blue-yellow -- reduced sensitivity to blue light).

TABLES

ColorTransformConfiguration

Defined in fuchsia.accessibility/color_transform.fidl

The current configuration for accessibility color transforms, which includes color inversion and color correction. This always includes the matrix required to apply the appropriate transforms. Color correction and color inversion may be active simultaneously.

For original RGB value (r, g, b) (each component ranged between 0 and 1), the RGB value of corrected color (r', g', b') is (r', g', b') = color_adjustment_post_offset + color_adjustment_matrix . ((r, g, b) + color_adjustment_pre_offset).

OrdinalNameTypeDescription
1 color_inversion_enabled bool

When color_inversion_enabled is true, certain colors are inverted across the entire screen. If this field is omitted behavior should remain unchanged.

2 color_correction ColorCorrectionMode

When color_correction is set to DISABLED, colors are displayed normally. When color_correction has different value, colors are modified to correct for the specified type of color blindness. If this field is omitted behavior should remain unchanged.

3 color_adjustment_matrix float32[9]

3x3 Matrix in row-major form which will be used by root presenter to apply color correction and color inversion, or a combination fo the two. This field should always be set.

4 color_adjustment_pre_offset float32[3]

3x1 vector which is used by root presenter as an offset added to the original RGB color, before it multiplies with the |color_adjustment_matrix|. This field should always be set.

5 color_adjustment_post_offset float32[3]

3x1 vector which is used by root presenter as an offset added to the multiplied result of |color_adjustment_matrix| and original RGB color. This field should always be set.