枚举 SwsFlags 

#[repr(i32)]
pub enum SwsFlags {
    SWS_FAST_BILINEAR = 1,
    SWS_BILINEAR = 2,
    SWS_BICUBIC = 4,
    SWS_X = 8,
    SWS_POINT = 16,
    SWS_AREA = 32,
    SWS_BICUBLIN = 64,
    SWS_GAUSS = 128,
    SWS_SINC = 256,
    SWS_LANCZOS = 512,
    SWS_SPLINE = 1_024,
    SWS_STRICT = 2_048,
    SWS_PRINT_INFO = 4_096,
    SWS_FULL_CHR_H_INT = 8_192,
    SWS_FULL_CHR_H_INP = 16_384,
    SWS_ACCURATE_RND = 262_144,
    SWS_BITEXACT = 524_288,
    SWS_UNSTABLE = 1_048_576,
    SWS_DIRECT_BGR = 32_768,
    SWS_ERROR_DIFFUSION = 8_388_608,
}

Variants

SWS_FAST_BILINEAR = 1

< fast bilinear filtering

SWS_BILINEAR = 2

< bilinear filtering

SWS_BICUBIC = 4

< 2-tap cubic B-spline

SWS_X = 8

< experimental

SWS_POINT = 16

< nearest neighbor

SWS_AREA = 32

< area averaging

SWS_BICUBLIN = 64

< bicubic luma, bilinear chroma

SWS_GAUSS = 128

< gaussian approximation

SWS_SINC = 256

< unwindowed sinc

SWS_LANCZOS = 512

< 3-tap sinc/sinc

SWS_SPLINE = 1_024

< cubic Keys spline

SWS_STRICT = 2_048

Return an error on underspecified conversions. Without this flag, unspecified fields are defaulted to sensible values.

SWS_PRINT_INFO = 4_096

Emit verbose log of scaling parameters.

SWS_FULL_CHR_H_INT = 8_192

Perform full chroma upsampling when upscaling to RGB.

For example, when converting 50x50 yuv420p to 100x100 rgba, setting this flag will scale the chroma plane from 25x25 to 100x100 (4:4:4), and then convert the 100x100 yuv444p image to rgba in the final output step.

Without this flag, the chroma plane is instead scaled to 50x100 (4:2:2), with a single chroma sample being reused for both of the horizontally adjacent RGBA output pixels.

SWS_FULL_CHR_H_INP = 16_384

Perform full chroma interpolation when downscaling RGB sources.

For example, when converting a 100x100 rgba source to 50x50 yuv444p, setting this flag will generate a 100x100 (4:4:4) chroma plane, which is then downscaled to the required 50x50.

Without this flag, the chroma plane is instead generated at 50x100 (dropping every other pixel), before then being downscaled to the required 50x50 resolution.

SWS_ACCURATE_RND = 262_144

Force bit-exact output. This will prevent the use of platform-specific optimizations that may lead to slight difference in rounding, in favor of always maintaining exact bit output compatibility with the reference C code.

Note: It is recommended to set both of these flags simultaneously.

SWS_BITEXACT = 524_288

Force bit-exact output. This will prevent the use of platform-specific optimizations that may lead to slight difference in rounding, in favor of always maintaining exact bit output compatibility with the reference C code.

Note: It is recommended to set both of these flags simultaneously.

SWS_UNSTABLE = 1_048_576

Allow using experimental new code paths. This may be faster, slower, or produce different output, with semantics subject to change at any point in time. For testing and debugging purposes only.

SWS_DIRECT_BGR = 32_768

< This flag has no effect

SWS_ERROR_DIFFUSION = 8_388_608

< Set SwsContext.dither instead

trait 实现

impl Clone for SwsFlags

fn clone(&self) -> SwsFlags

Returns a duplicate of the value. 阅读更多

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

从 source 执行拷贝赋值。 阅读更多

impl Debug for SwsFlags

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

使用给定的格式化器格式化该值。 阅读更多

impl Hash for SwsFlags

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. 阅读更多

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. 阅读更多

impl PartialEq for SwsFlags

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

Tests for self and other values to be equal, and is used by ==.

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

测试 !=。默认实现几乎总是足够的，没有充分理由不应被重写。

impl Copy for SwsFlags

impl Eq for SwsFlags

impl StructuralPartialEq for SwsFlags