Enum OutputFormat 

pub enum OutputFormat {
    Png,
    PngFast,
    Webp,
    WebpOrPng,
}

输出图片格式。文字图首选 Webp(最小 + 快);Png 通用兜底;PngFast 要 PNG 又要快。

Variants

Png

PNG(无损,平衡压缩,默认——通用兼容)。

PngFast

PNG(无损,快压缩:约 8 倍快、体积大 ~40%)。必须出 PNG 又要快时用。

Webp

WebP(无损;通常体积最小、速度也好)。文字图首选;画布单边 > 16383px(WebP 上限)时编码报错。

WebpOrPng

WebP 优先,画布单边 > 16383px 时自动落 PNG。要 WebP 的体积、又不想为超长图单独处理报错时用 ——超限会改格式,显式选了才发生。

Trait Implementations

impl Clone for OutputFormat

fn clone(&self) -> OutputFormat

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for OutputFormat

impl Debug for OutputFormat

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

Formats the value using the given formatter.

impl Eq for OutputFormat

impl PartialEq for OutputFormat

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

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

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for OutputFormat