Struct SoftMaskParams 

pub struct SoftMaskParams {
    pub subtype: SoftMaskSubtype,
    pub bbox: [f64; 4],
    pub backdrop_color: Option<[f64; 3]>,
    pub transfer_invert: bool,
    pub has_nested_mask_scope: bool,
    pub parent_clip_bbox: Option<[f64; 4]>,
}

Parameters for a soft mask compositing operation.

Fields

subtype: SoftMaskSubtype

How to extract the mask from the rendered form.

bbox: [f64; 4]

Device-space bounding box [x_min, y_min, x_max, y_max].

backdrop_color: Option<[f64; 3]>

Backdrop color for luminosity masks (RGB, 0.0–1.0). None = black.

transfer_invert: bool

Whether the mask values should be inverted (from /TR {1 exch sub}).

has_nested_mask_scope: bool

Whether the mask form contained nested soft mask scopes (gs-set SMask). When true, the renderer composites semi-transparent pixels onto the backdrop before extracting luminosity.

parent_clip_bbox: Option<[f64; 4]>

Bounding box of the parent gstate’s clip path at the moment the SoftMasked element was emitted (in device space).

Used by the renderer as a hard upper bound on the cached mask raster size: pixels outside the parent clip can’t affect the final image, so the raster never needs to extend beyond it. Without this cap, a soft mask whose form contains an unbounded shading (no /BBox) inside a sentinel-sized internal clip would blow past the renderer’s mask-raster size limit and rasterize to nothing, making the entire SoftMasked element invisible.

None means the parent had no active clip path — the renderer then bounds the raster only by the mask’s actual paint bounds.

Trait Implementations

impl Clone for SoftMaskParams

fn clone(&self) -> SoftMaskParams

Returns a duplicate of the value.

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

Performs copy-assignment from source.