Struct DecoderConfig 

pub struct DecoderConfig { /* private fields */ }

Type-safe configuration builder for ZBar decoders

This builder uses the type system to ensure only valid configurations can be set for each symbology type.

Example

use zedbar::config::*;

let config = DecoderConfig::new()
    .enable(Ean13)
    .enable(Code39)
    .set_checksum(Code39, true, false)
    .set_length_limits(Code39, 4, 20)
    .position_tracking(true);

Implementations

impl DecoderConfig

pub fn new() -> Self

Create a new configuration with sensible defaults

By default:

• EAN-13, EAN-8, I25, DataBar, Codabar, Code39, Code93, Code128, QR, SQ are enabled
• UPC-A, UPC-E, ISBN-10, ISBN-13 can be emitted as variants (not separately enabled)
• Position tracking is enabled
• Scan density is 1x1
• Inverted image testing is disabled

pub fn enable<S: Symbology + SupportsEnable>(self, _: S) -> Self

Enable a symbology

pub fn disable<S: Symbology + SupportsEnable>(self, _: S) -> Self

Disable a symbology

pub fn disable_all(self) -> Self

Disable all symbologies

Useful when you want to start with a clean slate and only enable specific symbologies.

Example

use zedbar::config::*;
use zedbar::DecoderConfig;

let config = DecoderConfig::new()
    .disable_all()
    .enable(QrCode)
    .enable(Code39);

pub fn is_enabled(&self, sym: SymbolType) -> bool

Check if a symbology is enabled

pub fn set_checksum<S: Symbology + SupportsChecksum>( self, _: S, add_check: bool, emit_check: bool, ) -> Self

Configure checksum behavior for a symbology

Arguments

• add_check - Validate checksum during decoding
• emit_check - Include checksum digit in decoded data

pub fn set_length_limits<S: Symbology + SupportsLengthLimits>( self, _: S, min: u32, max: u32, ) -> Self

Set minimum and maximum length limits

Only valid for variable-length symbologies like Code39, Code128, etc.

pub fn set_binary<S: Symbology + SupportsBinary>( self, _: S, enabled: bool, ) -> Self

Enable or disable binary mode for 2D codes

When enabled, binary data is preserved without text conversion.

pub fn set_uncertainty<S: Symbology + SupportsUncertainty>( self, _: S, threshold: u32, ) -> Self

Set uncertainty threshold for edge detection

Higher values are more tolerant of poor quality images but may produce more false positives.

pub fn position_tracking(self, enabled: bool) -> Self

Enable or disable position tracking

When enabled, the scanner records the pixel coordinates of each detected symbol.

pub fn test_inverted(self, enabled: bool) -> Self

Enable or disable inverted image testing

When enabled, if no symbols are found in the normal image, the scanner will try again with an inverted (negative) image.

pub fn scan_density(self, x: u32, y: u32) -> Self

Set scan density for both axes

Higher density means more scan lines, which improves detection but increases processing time. A value of 1 means scan every line.

pub fn upscale_small_images(self, enabled: bool) -> Self

Enable or disable automatic upscaling of small images

When enabled (the default), small images (< 200px in either dimension) are automatically upscaled before scanning to improve QR code detection. Small QR codes often have modules that are only 2-3 pixels wide, which is too small for reliable finder pattern detection.

Disable this if you want to minimize processing time and are confident your images have sufficient resolution.

pub fn x_density(self, density: u32) -> Self

Set horizontal scan density

pub fn y_density(self, density: u32) -> Self

Set vertical scan density

Trait Implementations

impl Clone for DecoderConfig

fn clone(&self) -> DecoderConfig

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for DecoderConfig

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

Formats the value using the given formatter.

impl Default for DecoderConfig

fn default() -> Self

Returns the “default value” for a type.