Struct egui::Color32

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#[repr(C)]
pub struct Color32(pub(crate) [u8; 4]);
Expand description

This format is used for space-efficient color representation (32 bits).

Instead of manipulating this directly it is often better to first convert it to either Rgba or crate::Hsva.

Internally this uses 0-255 gamma space sRGBA color with premultiplied alpha. Alpha channel is in linear space.

The special value of alpha=0 means the color is to be treated as an additive color.

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§0: [u8; 4]

Implementations§

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impl Color32

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pub const TRANSPARENT: Color32 = _

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pub const BLACK: Color32 = _

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pub const DARK_GRAY: Color32 = _

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pub const GRAY: Color32 = _

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pub const LIGHT_GRAY: Color32 = _

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pub const WHITE: Color32 = _

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pub const BROWN: Color32 = _

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pub const DARK_RED: Color32 = _

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pub const RED: Color32 = _

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pub const LIGHT_RED: Color32 = _

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pub const YELLOW: Color32 = _

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pub const LIGHT_YELLOW: Color32 = _

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pub const KHAKI: Color32 = _

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pub const DARK_GREEN: Color32 = _

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pub const GREEN: Color32 = _

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pub const LIGHT_GREEN: Color32 = _

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pub const DARK_BLUE: Color32 = _

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pub const BLUE: Color32 = _

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pub const LIGHT_BLUE: Color32 = _

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pub const GOLD: Color32 = _

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pub const DEBUG_COLOR: Color32 = _

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pub const PLACEHOLDER: Color32 = _

An ugly color that is planned to be replaced before making it to the screen.

This is an invalid color, in that it does not correspond to a valid multiplied color, nor to an additive color.

This is used as a special color key, i.e. often taken to mean “no color”.

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pub const TEMPORARY_COLOR: Color32 = Self::PLACEHOLDER

👎Deprecated: Renamed to PLACEHOLDER
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pub const fn from_rgb(r: u8, g: u8, b: u8) -> Color32

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pub const fn from_rgb_additive(r: u8, g: u8, b: u8) -> Color32

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pub const fn from_rgba_premultiplied(r: u8, g: u8, b: u8, a: u8) -> Color32

From sRGBA with premultiplied alpha.

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pub fn from_rgba_unmultiplied(r: u8, g: u8, b: u8, a: u8) -> Color32

From sRGBA WITHOUT premultiplied alpha.

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pub const fn from_gray(l: u8) -> Color32

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pub const fn from_black_alpha(a: u8) -> Color32

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pub fn from_white_alpha(a: u8) -> Color32

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pub const fn from_additive_luminance(l: u8) -> Color32

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pub const fn is_opaque(&self) -> bool

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pub const fn r(&self) -> u8

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pub const fn g(&self) -> u8

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pub const fn b(&self) -> u8

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pub const fn a(&self) -> u8

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pub fn to_opaque(self) -> Color32

Returns an opaque version of self

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pub const fn additive(self) -> Color32

Returns an additive version of self

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pub fn is_additive(self) -> bool

Is the alpha=0 ?

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pub const fn to_array(&self) -> [u8; 4]

Premultiplied RGBA

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pub const fn to_tuple(&self) -> (u8, u8, u8, u8)

Premultiplied RGBA

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pub fn to_srgba_unmultiplied(&self) -> [u8; 4]

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pub fn gamma_multiply(self, factor: f32) -> Color32

Multiply with 0.5 to make color half as opaque, perceptually.

Fast multiplication in gamma-space.

This is perceptually even, and faster that Self::linear_multiply.

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pub fn linear_multiply(self, factor: f32) -> Color32

Multiply with 0.5 to make color half as opaque in linear space.

This is using linear space, which is not perceptually even. You may want to use Self::gamma_multiply instead.

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pub fn to_normalized_gamma_f32(self) -> [f32; 4]

Converts to floating point values in the range 0-1 without any gamma space conversion.

Use this with great care! In almost all cases, you want to convert to crate::Rgba instead in order to obtain linear space color values.

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impl Color32

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pub fn from_hex(hex: &str) -> Result<Color32, ParseHexColorError>

Parses a color from a hex string.

Supports the 3, 4, 6, and 8-digit formats, according to the specification in https://drafts.csswg.org/css-color-4/#hex-color

To parse hex colors at compile-time (e.g. for use in const contexts) use the macro [crate::hex_color!] instead.

§Example
use ecolor::Color32;
assert_eq!(Ok(Color32::RED), Color32::from_hex("#ff0000"));
assert_eq!(Ok(Color32::GREEN), Color32::from_hex("#00ff00ff"));
assert_eq!(Ok(Color32::BLUE), Color32::from_hex("#00f"));
assert_eq!(Ok(Color32::TRANSPARENT), Color32::from_hex("#0000"));
§Errors

Returns an error if the string doesn’t start with the hash # character, if the remaining length does not correspond to one of the standard formats (3, 4, 6, or 8), if it contains non-hex characters.

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pub fn to_hex(&self) -> String

Formats the color as a hex string.

§Example
use ecolor::Color32;
assert_eq!(Color32::RED.to_hex(), "#ff0000ff");
assert_eq!(Color32::GREEN.to_hex(), "#00ff00ff");
assert_eq!(Color32::BLUE.to_hex(), "#0000ffff");
assert_eq!(Color32::TRANSPARENT.to_hex(), "#00000000");

Uses the 8-digit format described in https://drafts.csswg.org/css-color-4/#hex-color, as that is the only format that is lossless. For other formats, see HexColor.

Trait Implementations§

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impl Clone for Color32

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fn clone(&self) -> Color32

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Color32

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

Formats the value using the given formatter. Read more
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impl Default for Color32

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fn default() -> Color32

Returns the “default value” for a type. Read more
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impl From<Color32> for Rgba

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fn from(srgba: Color32) -> Rgba

Converts to this type from the input type.
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impl From<Hsva> for Color32

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fn from(hsva: Hsva) -> Color32

Converts to this type from the input type.
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impl From<HsvaGamma> for Color32

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fn from(hsvag: HsvaGamma) -> Color32

Converts to this type from the input type.
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impl From<Rgba> for Color32

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fn from(rgba: Rgba) -> Color32

Converts to this type from the input type.
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impl Hash for Color32

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

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl Index<usize> for Color32

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type Output = u8

The returned type after indexing.
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fn index(&self, index: usize) -> &u8

Performs the indexing (container[index]) operation. Read more
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impl IndexMut<usize> for Color32

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fn index_mut(&mut self, index: usize) -> &mut u8

Performs the mutable indexing (container[index]) operation. Read more
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impl PartialEq for Color32

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fn eq(&self, other: &Color32) -> bool

This method tests for self and other values to be equal, and is used by ==.
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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.
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impl Zeroable for Color32

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fn zeroed() -> Self

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impl Copy for Color32

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impl Eq for Color32

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impl Pod for Color32

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impl StructuralPartialEq for Color32

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CheckedBitPattern for T
where T: AnyBitPattern,

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type Bits = T

Self must have the same layout as the specified Bits except for the possible invalid bit patterns being checked during is_valid_bit_pattern.
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fn is_valid_bit_pattern(_bits: &T) -> bool

If this function returns true, then it must be valid to reinterpret bits as &Self.
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> AnyBitPattern for T
where T: Pod,

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impl<T> NoUninit for T
where T: Pod,

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impl<T> SerializableAny for T
where T: 'static + Any + Clone + for<'a> Send + Sync,