Struct PrimitiveDependencyInfo 

pub struct PrimitiveDependencyInfo {
    pub prim_clip_box: PictureBox2D,
    pub images: SmallVec<[ImageDependency; 8]>,
    pub opacity_bindings: SmallVec<[Binding<f32>; 4]>,
    pub color_binding: Option<Binding<ColorU>>,
    pub prim_uid: ItemUid,
    pub prim_scratch: VertRange,
    pub cov_scratch: VertRange,
    pub clips: SmallVec<[(ItemUid, VertRange); 4]>,
}

Information about the dependencies of a single primitive instance. Built once per primitive (outside the tile loop); passed to each tile’s add_prim_dependency, which does the per-tile clamping and vert-data push.

Fields

prim_clip_box: PictureBox2D

The (conservative) clipped area in picture space this primitive occupies. Used for local_valid_rect accumulation and quadtree binning.

images: SmallVec<[ImageDependency; 8]>

Image keys this primitive depends on.

opacity_bindings: SmallVec<[Binding<f32>; 4]>

Opacity bindings this primitive depends on.

color_binding: Option<Binding<ColorU>>

Color binding this primitive depends on.

prim_uid: ItemUid

Intern uid for this primitive instance. Stable across frames and across content-side scroll events: scene building normalises each primitive’s prim_rect by the accumulated external_scroll_offset before interning, so the key (and therefore this uid) does not change when the scroll position changes. If external_scroll_offset is ever removed, this stability guarantee would need to be preserved by another mechanism.

prim_scratch: VertRange

Scratch range for the primitive’s rect corners in raster space (unquantized). Quantized into per-tile vert_data inside add_prim_dependency.

cov_scratch: VertRange

Scratch range for the coverage rect corners (prim ∩ clip) in raster space. Tracked separately from prim_scratch because merging them into a single intersection loses prim-rect information: a UV-mapped primitive whose rect changes size while the clip keeps the visible region constant would produce an unchanged intersection yet sample different source pixels. Using coverage_rect (rather than the raw local_clip_rect) avoids spurious invalidations when the clip changes outside the prim extent.

clips: SmallVec<[(ItemUid, VertRange); 4]>

Per-clip data: (clip intern uid, scratch range for clip corners). The uid covers the clip’s shape/mode; position is captured in the scratch range.

Implementations

impl PrimitiveDependencyInfo

pub fn new(prim_uid: ItemUid, prim_clip_box: PictureBox2D) -> Self