Enum Shader

pub enum Shader<'a> {
    SolidColor(Color),
    LinearGradient(LinearGradient),
    RadialGradient(RadialGradient),
    Pattern(Pattern<'a>),
}

A shader specifies the source color(s) for what is being drawn.

If a paint has no shader, then the paint’s color is used. If the paint has a shader, then the shader’s color(s) are use instead, but they are modulated by the paint’s alpha. This makes it easy to create a shader once (e.g. bitmap tiling or gradient) and then change its transparency without having to modify the original shader. Only the paint’s alpha needs to be modified.

Variants

SolidColor(Color)

A solid color shader.

LinearGradient(LinearGradient)

A linear gradient shader.

RadialGradient(RadialGradient)

A radial gradient shader.

Pattern(Pattern<'a>)

A pattern shader.

Implementations

impl<'a> Shader<'a>

pub fn is_opaque(&self) -> bool

Checks if the shader is guaranteed to produce only opaque colors.

pub fn transform(&mut self, ts: Transform)

Transforms the shader.

pub fn apply_opacity(&mut self, opacity: f32)

Shifts shader’s opacity.

opacity will be clamped to the 0..=1 range.

This is roughly the same as Skia’s SkPaint::setAlpha.

Unlike Skia, we do not support global alpha/opacity, which is in Skia is set via the alpha channel of the SkPaint::fColor4f. Instead, you can shift the opacity of the shader to whatever value you need.

• For SolidColor this function will multiply color.alpha by opacity.
• For gradients this function will multiply all colors by opacity.
• For Pattern this function will multiply Patter::opacity by opacity.

Trait Implementations

impl<'a> Clone for Shader<'a>

fn clone(&self) -> Shader<'a>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for Shader<'a>

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

Formats the value using the given formatter.

impl<'a> PartialEq for Shader<'a>

fn eq(&self, other: &Shader<'a>) -> 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<'a> StructuralPartialEq for Shader<'a>