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Options

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Struct Options 

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pub struct Options {
Show 16 fields
    pub fix_errors: bool,
    pub force: bool,
    pub filters: IndexSet<FilterStrategy>,
    pub interlace: Option<bool>,
    pub optimize_alpha: bool,
    pub bit_depth_reduction: bool,
    pub color_type_reduction: bool,
    pub palette_reduction: bool,
    pub grayscale_reduction: bool,
    pub idat_recoding: bool,
    pub scale_16: bool,
    pub strip: StripChunks,
    pub deflater: Deflater,
    pub fast_evaluation: bool,
    pub timeout: Option<Duration>,
    pub max_decompressed_size: Option<usize>,

}
Expand description

Options controlling the output of the optimize function

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§fix_errors: bool

Attempt to fix errors when decoding the input file rather than returning an Err.

Default: false

§force: bool

Write to output even if there was no improvement in compression.

Default: false

§filters: IndexSet<FilterStrategy>

Which FilterStrategy to try on the file

Default: None,Sub,Entropy,Bigrams

§interlace: Option<bool>

Whether to change the interlacing of the file.

  • None will not change the current interlacing.
  • Some(x) will turn interlacing on or off.

Default: Some(false)

§optimize_alpha: bool

Whether to allow transparent pixels to be altered to improve compression.

Default: false

§bit_depth_reduction: bool

Whether to attempt bit depth reduction

Default: true

§color_type_reduction: bool

Whether to attempt color type reduction

Default: true

§palette_reduction: bool

Whether to attempt palette reduction

Default: true

§grayscale_reduction: bool

Whether to attempt grayscale reduction

Default: true

§idat_recoding: bool

Whether to perform recoding of IDAT and other compressed chunks

If any type of reduction is performed, IDAT recoding will be performed regardless of this setting

Default: true

§scale_16: bool

Whether to forcibly reduce 16-bit to 8-bit by scaling

Default: false

§strip: StripChunks

Which chunks to strip from the PNG file, if any

Default: None

§deflater: Deflater

Which DEFLATE (zlib) algorithm to use (e.g. Zopfli)

Default: Libdeflater

§fast_evaluation: bool

Whether to use fast evaluation to pick the best filter

Default: true

§timeout: Option<Duration>

Maximum amount of time to spend on optimizations. Further potential optimizations are skipped if the timeout is exceeded.

Default: None

§max_decompressed_size: Option<usize>

Maximum decompressed size of the input IDAT. If decompression would exceed this size, it will be rejected.

Default: None

Implementations§

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impl Options

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pub fn from_preset(level: u8) -> Self

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pub fn max_compression() -> Self

Trait Implementations§

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impl Clone for Options

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fn clone(&self) -> Options

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Options

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

Formats the value using the given formatter. Read more
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impl Default for Options

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fn default() -> Self

Returns the “default value” for a type. Read more

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