Trait SourceEncodingDetails 

pub trait SourceEncodingDetails:
    Any
    + Send
    + Sync {
    // Required method
    fn source_generic_quality(&self) -> Option<f32>;

    // Provided method
    fn is_lossless(&self) -> bool { ... }
}

Codec-agnostic interface for source encoding properties.

Implemented by each codec’s probe/detect type to provide both a generic quality number and codec-specific details. The generic quality uses the same 0.0–100.0 scale as EncoderConfig::with_generic_quality().

Downcasting

Use codec_details::<T>() to access the concrete probe type for codec-specific fields:

if let Some(jpeg) = details.codec_details::<zenjpeg::detect::JpegProbe>() {
    println!("Encoder: {:?}", jpeg.encoder);
}

Required Methods

fn source_generic_quality(&self) -> Option<f32>

Estimated source quality on the generic 0.0–100.0 scale.

Returns None for lossless formats (PNG, lossless WebP) or when quality cannot be determined from the bitstream headers.

The value is approximate (±5) — different encoders map quality parameters differently, so the reverse-engineered value may not exactly match the original setting.

Provided Methods

fn is_lossless(&self) -> bool

Whether the source encoding is lossless.

True for PNG, lossless WebP, lossless JPEG 2000, etc. When true, source_generic_quality() typically returns None.

Implementations

impl dyn SourceEncodingDetails

pub fn codec_details<T: SourceEncodingDetails + 'static>(&self) -> Option<&T>

Downcast to a concrete codec probe type.

Returns Some(&T) if the underlying type matches, None otherwise.

use zenwebp::detect::WebPProbe;

if let Some(webp) = details.codec_details::<WebPProbe>() {
    println!("Lossy: {:?}", webp.bitstream);
}

impl dyn SourceEncodingDetails + Send

pub fn codec_details<T: SourceEncodingDetails + 'static>(&self) -> Option<&T>

Downcast to a concrete codec probe type.

impl dyn SourceEncodingDetails + Send + Sync

pub fn codec_details<T: SourceEncodingDetails + 'static>(&self) -> Option<&T>

Downcast to a concrete codec probe type.

Implementors