Enum gif::Extension

#[repr(u8)]
pub enum Extension {
    Text = 1,
    Control = 249,
    Comment = 254,
    Application = 255,
}

Known GIF extension labels.

These are extensions which may be interpreted by the library and to which a specification with the internal data layout is known.

Variants

Text = 1

Plain Text extension.

This instructs the decoder to render a text as characters in a grid of cells, in a mono-spaced font of its choosing. This is seldom actually implemented and ignored by ImageMagick. The color is always taken from the global table which further complicates any use. No real information on the frame sequencing of this block is available in the standard.

Control = 249

Control extension.

Comment = 254

Comment extension.

Application = 255

Application extension.

See ImageMagick for an idea of commonly recognized extensions.

Implementations

impl Extension

pub fn from_u8(n: u8) -> Option<Extension>

Converts u8 to a Extension if it is known.

Trait Implementations

impl Clone for Extension

fn clone(&self) -> Extension

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Extension

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

Formats the value using the given formatter.

impl From<Extension> for AnyExtension

fn from(ext: Extension) -> Self

Converts to this type from the input type.

impl PartialEq for Extension

fn eq(&self, other: &Extension) -> 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 Copy for Extension

impl Eq for Extension

impl StructuralEq for Extension

impl StructuralPartialEq for Extension