Struct EncodingStream 

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

The main JPEG encoder.

Use the builder pattern to configure encoding options, then call encode_rgb() or encode_gray() to produce JPEG data.

Presets

Use Encoder::new(preset) with a Preset to choose your settings:

• Preset::ProgressiveBalanced - Progressive with all optimizations (default)
• Preset::BaselineBalanced - Baseline with all optimizations
• Preset::BaselineFastest - No optimizations, maximum speed
• Preset::ProgressiveSmallest - Maximum compression (matches C mozjpeg)

Example

use mozjpeg_rs::{Encoder, Preset};

let pixels: Vec<u8> = vec![0; 640 * 480 * 3];

let jpeg = Encoder::new(Preset::default())
    .quality(85)
    .encode_rgb(&pixels, 640, 480)?;

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: Write> EncodingStream<W>

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

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>

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.