Struct CompactLayoutCache 

pub struct CompactLayoutCache {
    pub tier1_enums: Vec<u64>,
    pub tier2_dims: Vec<CompactNodeProps>,
    pub tier2_cold: Vec<CompactNodePropsCold>,
    pub tier2b_text: Vec<CompactTextProps>,
    pub font_dirty_nodes: Vec<usize>,
    pub prev_font_hashes: Vec<u64>,
    pub font_hash_to_families: BTreeMap<u64, StyleFontFamilyVec>,
    pub dom_declared_flags: u32,
}

Overflow properties that couldn’t fit in Tier 1/2 encoding. Contains the original CssProperty values for properties that:

• Have calc() expressions
• Exceed the numeric range of compact encoding
• Are rare CSS properties (grid, transforms, etc.) Three-tier compact layout property cache.

Allocated once per restyle, indexed by node index (same as NodeId). Provides O(1) array-indexed access to all layout properties.

Non-compact properties (background, box-shadow, transform, etc.) are resolved via the slow cascade path in CssPropertyCache::get_property_slow().

Fields

tier1_enums: Vec<u64>

Tier 1: ALL enum properties bitpacked into u64 per node (8 B/node)

tier2_dims: Vec<CompactNodeProps>

Tier 2 hot: Layout-critical numeric dimensions per node (68 B/node)

tier2_cold: Vec<CompactNodePropsCold>

Tier 2 cold: Paint-only properties per node (28 B/node)

tier2b_text: Vec<CompactTextProps>

Tier 2b: Text/IFC properties per node (24 B/node)

font_dirty_nodes: Vec<usize>

Indices of nodes whose font_family_hash changed since the last frame.

Enables per-node font dirty tracking instead of the global all-or-nothing font_stacks_hash XOR approach. When this list is non-empty, only the font chains for these specific nodes need to be re-resolved, avoiding O(N) re-resolution when a single node’s font-family changes.

Populated during build_compact_cache() by comparing each node’s font_family_hash against prev_font_hashes.

prev_font_hashes: Vec<u64>

Previous frame’s per-node font_family_hash values.

Stored after each compact cache build so that the next build can detect which specific nodes’ font-family changed (rather than relying on a collision-prone global XOR hash).

font_hash_to_families: BTreeMap<u64, StyleFontFamilyVec>

Reverse map: font_family_hash (u64) → actual StyleFontFamilyVec.

Populated during build_compact_cache() as a byproduct of hash computation. Consumers use this to look up font family names from the compact cache hash without going through get_property_slow() (which fails for inherited values on text nodes).

dom_declared_flags: u32

Bitfield tracking which rare text props are declared anywhere in the DOM. Built once during build_compact_cache_with_inheritance. When a bit is clear, callers (e.g. translate_to_text3_constraints) can skip the cascade walk for that property — its slow path would always return None and fall back to the default. See DOM_HAS_* constants.

Implementations

impl CompactLayoutCache

pub fn empty() -> Self

Create an empty cache (no nodes).

pub fn with_capacity(node_count: usize) -> Self

Create a cache pre-allocated for node_count nodes, filled with defaults.

pub fn node_count(&self) -> usize

Number of nodes in this cache.

pub fn get_display(&self, node_idx: usize) -> LayoutDisplay

pub fn get_position(&self, node_idx: usize) -> LayoutPosition

pub fn get_float(&self, node_idx: usize) -> LayoutFloat

pub fn get_overflow_x(&self, node_idx: usize) -> LayoutOverflow

pub fn get_overflow_y(&self, node_idx: usize) -> LayoutOverflow

pub fn get_box_sizing(&self, node_idx: usize) -> LayoutBoxSizing

pub fn get_flex_direction(&self, node_idx: usize) -> LayoutFlexDirection

pub fn get_flex_wrap(&self, node_idx: usize) -> LayoutFlexWrap

pub fn get_justify_content(&self, node_idx: usize) -> LayoutJustifyContent

pub fn get_align_items(&self, node_idx: usize) -> LayoutAlignItems

pub fn get_align_content(&self, node_idx: usize) -> LayoutAlignContent

pub fn get_writing_mode(&self, node_idx: usize) -> LayoutWritingMode

pub fn get_clear(&self, node_idx: usize) -> LayoutClear

pub fn get_font_weight(&self, node_idx: usize) -> StyleFontWeight

pub fn get_font_style(&self, node_idx: usize) -> StyleFontStyle

pub fn get_text_align(&self, node_idx: usize) -> StyleTextAlign

pub fn get_visibility(&self, node_idx: usize) -> StyleVisibility

pub fn get_white_space(&self, node_idx: usize) -> StyleWhiteSpace

pub fn get_direction(&self, node_idx: usize) -> StyleDirection

pub fn get_vertical_align(&self, node_idx: usize) -> StyleVerticalAlign

pub fn get_border_collapse(&self, node_idx: usize) -> StyleBorderCollapse

pub fn get_width_raw(&self, node_idx: usize) -> u32

Get width as encoded u32 (use decode_pixel_value_u32 or check sentinel).

pub fn get_height_raw(&self, node_idx: usize) -> u32

pub fn get_min_width_raw(&self, node_idx: usize) -> u32

pub fn get_max_width_raw(&self, node_idx: usize) -> u32

pub fn get_min_height_raw(&self, node_idx: usize) -> u32

pub fn get_max_height_raw(&self, node_idx: usize) -> u32

pub fn get_font_size_raw(&self, node_idx: usize) -> u32

pub fn get_flex_basis_raw(&self, node_idx: usize) -> u32

pub fn get_padding_top(&self, node_idx: usize) -> Option<f32>

Get padding-top as resolved px. Returns None if sentinel (needs slow path).

pub fn get_padding_right(&self, node_idx: usize) -> Option<f32>

pub fn get_padding_bottom(&self, node_idx: usize) -> Option<f32>

pub fn get_padding_left(&self, node_idx: usize) -> Option<f32>

pub fn get_margin_top(&self, node_idx: usize) -> Option<f32>

pub fn get_margin_right(&self, node_idx: usize) -> Option<f32>

pub fn get_margin_bottom(&self, node_idx: usize) -> Option<f32>

pub fn get_margin_left(&self, node_idx: usize) -> Option<f32>

pub fn is_margin_top_auto(&self, node_idx: usize) -> bool

Check if margin is Auto (important for centering logic).

pub fn is_margin_right_auto(&self, node_idx: usize) -> bool

pub fn is_margin_bottom_auto(&self, node_idx: usize) -> bool

pub fn is_margin_left_auto(&self, node_idx: usize) -> bool

pub fn get_border_top_width(&self, node_idx: usize) -> Option<f32>

pub fn get_border_right_width(&self, node_idx: usize) -> Option<f32>

pub fn get_border_bottom_width(&self, node_idx: usize) -> Option<f32>

pub fn get_border_left_width(&self, node_idx: usize) -> Option<f32>

pub fn get_padding_top_raw(&self, node_idx: usize) -> i16

pub fn get_padding_right_raw(&self, node_idx: usize) -> i16

pub fn get_padding_bottom_raw(&self, node_idx: usize) -> i16

pub fn get_padding_left_raw(&self, node_idx: usize) -> i16

pub fn get_margin_top_raw(&self, node_idx: usize) -> i16

pub fn get_margin_right_raw(&self, node_idx: usize) -> i16

pub fn get_margin_bottom_raw(&self, node_idx: usize) -> i16

pub fn get_margin_left_raw(&self, node_idx: usize) -> i16

pub fn get_border_top_width_raw(&self, node_idx: usize) -> i16

pub fn get_border_right_width_raw(&self, node_idx: usize) -> i16

pub fn get_border_bottom_width_raw(&self, node_idx: usize) -> i16

pub fn get_border_left_width_raw(&self, node_idx: usize) -> i16

pub fn get_top(&self, node_idx: usize) -> i16

pub fn get_right(&self, node_idx: usize) -> i16

pub fn get_bottom(&self, node_idx: usize) -> i16

pub fn get_left(&self, node_idx: usize) -> i16

pub fn get_flex_grow(&self, node_idx: usize) -> Option<f32>

pub fn get_flex_shrink(&self, node_idx: usize) -> Option<f32>

pub fn get_z_index(&self, node_idx: usize) -> i16

pub fn get_border_top_color_raw(&self, node_idx: usize) -> u32

pub fn get_border_right_color_raw(&self, node_idx: usize) -> u32

pub fn get_border_bottom_color_raw(&self, node_idx: usize) -> u32

pub fn get_border_left_color_raw(&self, node_idx: usize) -> u32

pub fn get_border_styles_packed(&self, node_idx: usize) -> u16

pub fn get_border_top_style(&self, node_idx: usize) -> BorderStyle

pub fn get_border_right_style(&self, node_idx: usize) -> BorderStyle

pub fn get_border_bottom_style(&self, node_idx: usize) -> BorderStyle

pub fn get_border_left_style(&self, node_idx: usize) -> BorderStyle

pub fn get_border_spacing_h_raw(&self, node_idx: usize) -> i16

pub fn get_border_spacing_v_raw(&self, node_idx: usize) -> i16

pub fn get_tab_size_raw(&self, node_idx: usize) -> i16

pub fn get_border_top_left_radius_raw(&self, node_idx: usize) -> i16

pub fn get_border_top_right_radius_raw(&self, node_idx: usize) -> i16

pub fn get_border_bottom_left_radius_raw(&self, node_idx: usize) -> i16

pub fn get_border_bottom_right_radius_raw(&self, node_idx: usize) -> i16

pub fn get_opacity_raw(&self, node_idx: usize) -> u8

Raw opacity byte. OPACITY_SENTINEL (255) = unset (default = 1.0). Otherwise value / 254.0 yields the opacity in [0.0, 1.0].

pub fn get_hot_flags(&self, node_idx: usize) -> u8

pub fn has_transform(&self, node_idx: usize) -> bool

pub fn has_transform_origin(&self, node_idx: usize) -> bool

pub fn has_box_shadow(&self, node_idx: usize) -> bool

pub fn has_text_decoration(&self, node_idx: usize) -> bool

pub fn has_background(&self, node_idx: usize) -> bool

pub fn has_clip_path(&self, node_idx: usize) -> bool

pub fn has_scrollbar_css(&self, node_idx: usize) -> bool

pub fn has_counter(&self, node_idx: usize) -> bool

pub fn has_break(&self, node_idx: usize) -> bool

pub fn has_text_orientation(&self, node_idx: usize) -> bool

pub fn has_text_shadow(&self, node_idx: usize) -> bool

pub fn has_backdrop_filter(&self, node_idx: usize) -> bool

pub fn has_filter(&self, node_idx: usize) -> bool

pub fn has_mix_blend_mode(&self, node_idx: usize) -> bool

pub fn dom_declared(&self, flag: u32) -> bool

DOM-level fast-path check: returns true if the given flag bit is set (some node in this DOM declared the corresponding property).

pub fn get_scrollbar_gutter_bits(&self, node_idx: usize) -> u8

Scrollbar-gutter: 0 = auto (default), 1 = stable, 2 = both-edges, 3 = mirror.

pub fn get_text_color_raw(&self, node_idx: usize) -> u32

pub fn get_font_family_hash(&self, node_idx: usize) -> u64

pub fn get_line_height(&self, node_idx: usize) -> Option<f32>

pub fn get_letter_spacing(&self, node_idx: usize) -> Option<f32>

pub fn get_word_spacing(&self, node_idx: usize) -> Option<f32>

pub fn get_text_indent(&self, node_idx: usize) -> Option<f32>

Trait Implementations

impl Clone for CompactLayoutCache

fn clone(&self) -> CompactLayoutCache

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CompactLayoutCache

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

Formats the value using the given formatter.

impl PartialEq for CompactLayoutCache

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