Struct webp_animation::prelude::LossyEncodingConfig

pub struct LossyEncodingConfig {

    pub target_size: usize,
    pub target_psnr: f32,
    pub segments: usize,
    pub sns_strength: usize,
    pub filter_strength: usize,
    pub filter_sharpness: usize,
    pub filter_type: usize,
    pub autofilter: bool,
    pub alpha_compression: bool,
    pub alpha_filtering: usize,
    pub alpha_quality: usize,
    pub pass: usize,
    pub show_compressed: bool,
    pub preprocessing: bool,
    pub partitions: usize,
    pub partition_limit: isize,
    pub use_sharp_yuv: bool,
}

Parameters related to lossy compression only

Fields

target_size: usize

if non-zero, set the desired target size in bytes. Takes precedence over the ‘compression’ parameter.

target_psnr: f32

if non-zero, specifies the minimal distortion to try to achieve. Takes precedence over target_size.

segments: usize

maximum number of segments to use, in [1..4]

sns_strength: usize

Spatial Noise Shaping. 0=off, 100=maximum.

filter_strength: usize

range: [0 = off .. 100 = strongest]

filter_sharpness: usize

range: [0 = off .. 7 = least sharp]

filter_type: usize

filtering type: 0 = simple, 1 = strong (only used if filter_strength > 0 or autofilter > 0)

autofilter: bool

Auto adjust filter’s strength [false = off, true = on]

alpha_compression: bool

Algorithm for encoding the alpha plane (false = none, true = compressed with WebP lossless). Default is true.

alpha_filtering: usize

Predictive filtering method for alpha plane. 0: none, 1: fast, 2: best. Default if 1.

alpha_quality: usize

Between 0 (smallest size) and 100 (lossless). Default is 100.

pass: usize

number of entropy-analysis passes (in [1..10]).

show_compressed: bool

if true, export the compressed picture back. In-loop filtering is not applied.

preprocessing: bool

preprocessing filter (0=none, 1=segment-smooth)

partitions: usize

log2(number of token partitions) in [0..3] Default is set to 0 for easier progressive decoding.

partition_limit: isize

quality degradation allowed to fit the 512k limit on prediction modes coding (0: no degradation, 100: maximum possible degradation).

use_sharp_yuv: bool

if needed, use sharp (and slow) RGB->YUV conversion

Implementations

impl LossyEncodingConfig

pub fn new_from_default_preset() -> Self

pub fn new_from_picture_preset() -> Self

pub fn new_from_photo_preset() -> Self

pub fn new_from_drawing_preset() -> Self

pub fn new_from_icon_preset() -> Self

pub fn new_from_text_preset() -> Self

Trait Implementations

impl Clone for LossyEncodingConfig

fn clone(&self) -> LossyEncodingConfig

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for LossyEncodingConfig

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

Formats the value using the given formatter.

impl Default for LossyEncodingConfig

fn default() -> Self

Returns the “default value” for a type.