Enum piston_window::draw_state::Blend

pub enum Blend {
    Alpha,
    Add,
    Lighter,
    Multiply,
    Invert,
}

The blend setting to use when drawing.

Using presets since some backends need one pipeline state object instance per blending technique.

Variants

Alpha

Alpha blending (allows semi-transparent pixels).

new_dest_color = src_color * src_alpha + dest_color * (1 - src_alpha)
new_dest_alpha = src_alpha + dest_alpha

Add

Additive blending.

new_dest_color = src_color + dest_color
new_dest_alpha = src_alpha + dest_alpha

Lighter

Additive blending with alpha channel.

new_dest_color = src_color * src_alpha + dest_color
new_dest_alpha = dest_alpha

Multiply

Multiply color components.

new_dest_color = src_color * dest_color
new_dest_alpha = src_alpha * dest_alpha

Invert

Invert colors when rendering a white shape.

new_dest_color = ref_color - src_color
new_dest_alpha = dest_alpha

When combining two fragments, subtract the destination color from a constant color using the source color as weight. Has an invert effect with the constant color as base and source color controlling displacement from the base color. A white source color and a white value results in plain invert. The output alpha is same as destination alpha.

Trait Implementations

impl Clone for Blend

fn clone(&self) -> Blend

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Blend

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

Formats the value using the given formatter.

impl PartialEq<Blend> for Blend

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=.

impl PartialOrd<Blend> for Blend

fn partial_cmp(&self, other: &Blend) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

This method tests less than (for self and other) and is used by the < operator.

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

This method tests less than or equal to (for self and other) and is used by the <= operator.

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

This method tests greater than (for self and other) and is used by the > operator.

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

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for Blend

impl StructuralPartialEq for Blend