Struct EncodingStream 

pub struct EncodingStream<W>
where
    W: Write,
{ /* private fields */ }

Active streaming encoding session.

Created by StreamingEncoder::start_rgb() or StreamingEncoder::start_gray(). Accepts scanlines via write_scanlines() and must be finalized with finish().

Implementations

impl<W> EncodingStream<W>

where W: Write,

pub fn write_scanlines(&mut self, data: &[u8]) -> Result<(), Error>

Write scanlines to the encoder.

Scanlines are buffered until a complete MCU row is available, then encoded. The number of bytes should be num_lines * width * bytes_per_pixel.

For best performance, write in multiples of the MCU height (8 or 16 lines).

pub fn finish(self) -> Result<W, Error>

Finish encoding and write the EOI marker.

This must be called after all scanlines have been written. Consumes the stream and returns the underlying writer.