Struct InputRequirements 

pub struct InputRequirements {
    pub needs_source_alpha: bool,
    pub needs_background_image: bool,
    pub needs_background_alpha: bool,
    pub needs_stroke_paint_image: bool,
    pub needs_fill_paint_image: bool,
}

Which surfaces need to be provided as inputs for a FilterPlan.

The various filters in a filter property may require different source images that the calling DrawingCtx is able to compute. For example, if a primitive inside a <filter> element has in="FillPaint", then the calling DrawingCtx must supply a surface filled as per the fill property of the element being filtered.

This struct holds the requirements for which such surfaces are needed. The caller is expected to construct it from an array of FilterSpec, and then to create the corresponding Input to create a FilterPlan.

See the in attribute from the Filter Effects Module Level 1.

Fields

needs_source_alpha: bool

At least one input is in=SourceAlpha.

needs_background_image: bool

At least one input is in=BackgroundImage.

needs_background_alpha: bool

At least one input is in=BackgroundAlpha.

needs_stroke_paint_image: bool

At least one input is in=StrokePaint.

needs_fill_paint_image: bool

At least one input is in=FillPaint.

Implementations

impl InputRequirements

pub fn new_from_filter_specs(specs: &[FilterSpec]) -> InputRequirements

Scans a list of FilterSpec to find out which contents need to be pre-rendered to process the filters.

fn fold(self, r: InputRequirements) -> InputRequirements

Trait Implementations

impl Debug for InputRequirements

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

Formats the value using the given formatter.

impl Default for InputRequirements

fn default() -> InputRequirements

Returns the “default value” for a type.

impl PartialEq for InputRequirements

fn eq(&self, other: &InputRequirements) -> 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 InputRequirements