Struct JpegEncoder 

pub struct JpegEncoder { /* private fields */ }

Encodes a baseline JPEG stream.

Implementations

impl JpegEncoder

pub const fn new() -> JpegEncoder

An encoder at the default quality.

pub fn with_quality(quality: u8) -> Result<JpegEncoder, PixelsError>

An encoder at an explicit quality, 1..=100.

Chroma subsampling follows quality, as it does in every encoder that exposes one number: 4:4:4 from 90 up, 4:2:0 below. Above 90 the subsampling, not the quantization, becomes the dominant loss, so keeping it on would make the quality number stop meaning anything.

Errors

Returns PixelsError::InvalidArgument unless quality is 1..=100.

pub const fn with_subsampling(self, subsampling: Subsampling) -> JpegEncoder

Override the chroma subsampling chosen by quality.

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

An encoder configured from generic encode options.

pub const fn subsampling(&self) -> Subsampling

The chosen chroma subsampling.

Trait Implementations

impl Debug for JpegEncoder

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

Formats the value using the given formatter.

impl Default for JpegEncoder

fn default() -> JpegEncoder

Returns the “default value” for a type.

impl Encoder for JpegEncoder

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.