Enum DctMethod 

pub enum DctMethod {
    Accurate,
    Fast,
}

IDCT accuracy/speed selection for the software JPEG decoder.

Accurate is the default and the kernel every published benchmark quotes: the islow-class Loeffler IDCT, bit-comparable to libjpeg-turbo’s default. Fast opts into the AAN ifast-class kernel — roughly an eighth of the multiplies, at a small, bounded pixel accuracy cost (and the documented ifast degeneration at very high quality factors). Fast is advisory: paths without a fast kernel (non-NEON tiers, hardware V4L2/nvJPEG decoders, PNG) use their normal accurate path.

Variants

Accurate

Accurate islow-class IDCT (default).

Fast

Fast AAN ifast-class IDCT (opt-in).

Trait Implementations

impl Clone for DctMethod

fn clone(&self) -> DctMethod

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for DctMethod

impl Debug for DctMethod

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

Formats the value using the given formatter.

impl Default for DctMethod

fn default() -> DctMethod

Returns the “default value” for a type.

impl Eq for DctMethod

impl PartialEq for DctMethod

fn eq(&self, other: &DctMethod) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for DctMethod