Struct PngEncoder 

pub struct PngEncoder { /* private fields */ }

Encodes a PNG stream.

Implementations

impl PngEncoder

pub const fn new() -> PngEncoder

An encoder at the default compression level.

pub const fn with_level(level: Level) -> PngEncoder

An encoder at an explicit DEFLATE level.

pub fn from_options(options: &EncodeOptions) -> PngEncoder

An encoder configured from generic encode options.

PNG is lossless, so EncodeOptions::quality cannot trade fidelity for size. It is read as compression effort instead, mapping 1..=100 onto DEFLATE levels 1..=9 — the only axis PNG actually has.

Trait Implementations

impl Debug for PngEncoder

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

Formats the value using the given formatter.

impl Default for PngEncoder

fn default() -> PngEncoder

Returns the “default value” for a type.

impl Encoder for PngEncoder

fn set_icc_profile(&mut self, profile: Option<&[u8]>) -> Result<(), PixelsError>

Embed profile as the image’s ICC colour profile, or write none.

fn write_header( &mut self, desc: &ImageDescriptor, sink: &mut dyn Sink, ) -> Result<(), PixelsError>

Begin an image, writing any container header.

fn write_row( &mut self, row: &[u8], _sink: &mut dyn Sink, ) -> Result<(), PixelsError>

Write the next row, top to bottom.

fn finish(&mut self, sink: &mut dyn Sink) -> Result<(), PixelsError>

Finish the image, writing any trailer and flushing the sink.