Enum fidl_fuchsia_hardware_display_types::CoordinateTransformation

#[repr(u8)]
pub enum CoordinateTransformation {
    Identity = 0,
    ReflectX = 1,
    ReflectY = 2,
    RotateCcw180 = 3,
    RotateCcw90 = 4,
    RotateCcw90ReflectX = 5,
    RotateCcw90ReflectY = 6,
    RotateCcw270 = 7,
}

Transformations that can be applied by display hardware to input images.

The coordinate system transformations listed here can be implemented in hardware by display engines, because they have straightforward implementations for raster images.

Support for input image transformations (every member except for IDENTITY) varies across display engines. This is because each transformation requires non-trivial hardware modifications that have area (cost) and power implications.

Variants

Identity = 0

Image pixels are passed through without any change.

This is the only value guaranteed to be supported by all display engine drivers.

ReflectX = 1

Image pixels are reflected across a line meeting the image’s center, parallel to the X axis.

This enum member’s numeric value has a single bit set to 1. Any transformation whose value has this bit set involves an X reflection.

This transformation is also called an “X flip”.

Example: |a b c d| |i j k l| |e f g h| -> |e f g h| |i j k l| |a b c d|

ReflectY = 2

Image pixels are reflected across a line meeting the image’s center, parallel to the Y axis.

This enum member’s numeric value has a single bit set to 1. Any transformation whose value has this bit set involves an Y reflection.

This transformation is also called an “Y flip”.

Example: |a b c d| |d c b a| |e f g h| -> |h g f e| |i j k l| |l k j i|

RotateCcw180 = 3

Image pixels are rotated around the image’s center counter-clockwise by 180 degrees.

This is equivalent to applying the REFLECT_X and REFLECT_Y transforms. REFLECT_X and REFLECT_Y are commutative, so their ordering doesn’t matter.

Example: |a b c d| |l k j i| |e f g h| -> |h g f e| |i j k l| |d c b a|

RotateCcw90 = 4

Image pixels are rotated around the image’s center counter-clockwise by 90 degrees.

The image produced by this transformation has different dimensions from the input image.

This enum member’s numeric value has a single bit set to 1. Any transformation whose value has this bit set involves a 90-degree counter-clockwise rotation.

Example: |a b c d| |d h l| |e f g h| -> |c g k| |i j k l| |b f j| |a e i|

RotateCcw90ReflectX = 5

Image pixels are transformed using ROTATE_CCW_90, followed by REFLECT_X.

The image produced by this transformation has different dimensions from the input image.

Example: |a b c d| |a e i| |e f g h| -> |b f k| |i j k l| |c g k| |d h l|

RotateCcw90ReflectY = 6

Image pixels are transformed using ROTATE_CCW_90, followed by REFLECT_Y.

The image produced by this transformation has different dimensions from the input image.

Example: |a b c d| |l h d| |e f g h| -> |k g c| |i j k l| |j f b| |i e a|

RotateCcw270 = 7

Image pixels are rotated around the image’s center counter-clockwise by 270 degrees.

The image produced by this transformation has different dimensions from the input image.

This is equivalent to applying the ROTATE_CCW_90 transform, followed by REFLECT_X and REFLECT_Y. REFLECT_X and REFLECT_Y are commutative, so their ordering doesn’t matter.

Example: |a b c d| |i e a| |e f g h| -> |j f b| |i j k l| |k g c| |l h d|

Implementations

impl CoordinateTransformation

pub fn from_primitive(prim: u8) -> Option<Self>

pub const fn into_primitive(self) -> u8

pub fn is_unknown(&self) -> bool

👎Deprecated: Strict enums should not use is_unknown

Trait Implementations

impl Clone for CoordinateTransformation

fn clone(&self) -> CoordinateTransformation

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for CoordinateTransformation

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Decode<CoordinateTransformation> for CoordinateTransformation

fn new_empty() -> Self

Creates a valid instance of Self. The specific value does not matter, since it will be overwritten by decode.

unsafe fn decode( &mut self, decoder: &mut Decoder<'_>, offset: usize, _depth: Depth, ) -> Result<()>

Decodes an object of type T from the decoder’s buffers into self.

impl Encode<CoordinateTransformation> for CoordinateTransformation

unsafe fn encode( self, encoder: &mut Encoder<'_>, offset: usize, _depth: Depth, ) -> Result<()>

Encodes the object into the encoder’s buffers. Any handles stored in the object are swapped for Handle::INVALID.

impl Hash for CoordinateTransformation

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for CoordinateTransformation

fn cmp(&self, other: &CoordinateTransformation) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized + PartialOrd,

Restrict a value to a certain interval.

impl PartialEq for CoordinateTransformation

fn eq(&self, other: &CoordinateTransformation) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for CoordinateTransformation

fn partial_cmp(&self, other: &CoordinateTransformation) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl TypeMarker for CoordinateTransformation

type Owned = CoordinateTransformation

The owned Rust type which this FIDL type decodes into.

fn inline_align(_context: Context) -> usize

Returns the minimum required alignment of the inline portion of the encoded object. It must be a (nonzero) power of two.

fn inline_size(_context: Context) -> usize

Returns the size of the inline portion of the encoded object, including padding for alignment. Must be a multiple of inline_align.

fn encode_is_copy() -> bool

Returns true if the memory layout of Self::Owned matches the FIDL wire format and encoding requires no validation. When true, we can optimize encoding arrays and vectors of Self::Owned to a single memcpy.

fn decode_is_copy() -> bool

Returns true if the memory layout of Self::Owned matches the FIDL wire format and decoding requires no validation. When true, we can optimize decoding arrays and vectors of Self::Owned to a single memcpy.

impl ValueTypeMarker for CoordinateTransformation

type Borrowed<'a> = CoordinateTransformation

The Rust type to use for encoding. This is a particular Encode<Self> type cheaply obtainable from &Self::Owned. There are three cases:

fn borrow<'a>(value: &'a <Self as TypeMarker>::Owned) -> Self::Borrowed<'a>

Cheaply converts from &Self::Owned to Self::Borrowed.

impl Copy for CoordinateTransformation

impl Eq for CoordinateTransformation

impl StructuralPartialEq for CoordinateTransformation