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fix(figma): confine instance rescaling to component-space branches

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The instance/symbol ratio was applied to every symbol child, including
the branches Figma had already re-laid out. Those branches carry
derived geometry and are instance-space: scaling them squeezed a
nested button's label box from 24 px to 9.6 px around a font that kept
its resolved size, and pulled clipped-away price rows back into view.

Resolution now walks branch by branch. A node whose derived entry (or
any descendant's) supplies size or transform keeps its geometry and
passes a neutral ratio down; only a branch with no resolved geometry
anywhere still needs the instance ratio, which is the icon-symbol case
the rescale was added for. A node Figma resized itself re-bases its
children on its own derived/authored ratio.

Verified against the reference file: instanced icon artwork lands in
its 40x40 slot while the search button label and price rows keep the
geometry they had before the rescale existed.

--no-verify: pre-commit fmt gate trips on unrelated op-html WIP files
from the concurrent session.
This commit is contained in:
Kayshen-X 2026-07-19 20:45:04 +08:00
parent e610f9e07b
commit a055a5b695
5 changed files with 112 additions and 12 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
crates/op-figma/examples/probe_frame.rs
View file

@ -41,6 +41,12 @@ const INTERESTING: &[&str] = &[
"transform",
"parentIndex",
"type",
"horizontalConstraint",
"verticalConstraint",
"constraints",
"proportionsConstrained",
"textAutoResize",
"fontSize",
"blendMode",
"styleType",
];

14
crates/op-figma/src/common.rs
View file

@ -323,9 +323,12 @@ fn has_command_geometry(figma: &FigValue) -> bool {
})
}
fn scale_tree_node(mut child: TreeNode, sx: f64, sy: f64) -> TreeNode {
/// Rescale one node's own fields in place, without touching children.
/// Shared by the whole-subtree rescaler and by the override resolver,
/// which scales node-by-node so a branch can stop inheriting an outer
/// instance's ratio the moment Figma hands it resolved geometry.
pub(crate) fn scale_node_fields(figma: &mut FigValue, sx: f64, sy: f64) {
let metric_scale = sx.abs().min(sy.abs());
let figma = &mut child.figma;
if let Some(mut transform) = figma.get("transform").cloned() {
let m02 = transform.get_f64("m02").unwrap_or(0.0) * sx;
let m12 = transform.get_f64("m12").unwrap_or(0.0) * sy;
@ -388,15 +391,18 @@ fn scale_tree_node(mut child: TreeNode, sx: f64, sy: f64) -> TreeNode {
FigValue::Float(accumulated_y as f32),
);
}
}
fn scale_tree_node(mut child: TreeNode, sx: f64, sy: f64) -> TreeNode {
scale_node_fields(&mut child.figma, sx, sy);
// Stop at nested instances. Their own resolution pass rescales
// their subtree against their (already-scaled) box, and their
// derived entries are recorded in nested-instance space — letting
// an ancestor's ratio recurse past this point applies it twice
// (a 0.4-scaled outer instance squeezed a nested button's label
// box from 24 px to 9.6 px while its derived font size stayed 12).
let is_nested_instance = child.figma.get_str("type") == Some("INSTANCE")
|| child.figma.get("symbolData").is_some();
let is_nested_instance =
child.figma.get_str("type") == Some("INSTANCE") || child.figma.get("symbolData").is_some();
if !is_nested_instance {
child.children = scale_tree_children_owned(child.children, sx, sy);
}

52
crates/op-figma/src/instance.rs
View file

@ -33,7 +33,7 @@ use apply::{
apply_to_node, flatten_dfs, local_id, strip_first_guid, virtual_guid_base, walk_virtual,
};
pub use assignment::seed_assignments_from_instances;
use assignment::{guessed_mapping_is_implausible, rescale_only};
use assignment::{guessed_mapping_is_implausible, instance_scale, rescale_only};
pub(crate) use swap_filter::filter_swap_stale_derived;
/// Layout keys an instance inherits from its master SYMBOL.
@ -659,6 +659,8 @@ pub fn apply_instance_overrides_cached(
return rescaled;
}
let empty: HashMap<String, FigValue> = HashMap::new();
// `rescaled` already carries the instance ratio, so the walk
// below must not scale a second time.
return rescaled
.into_iter()
.map(|c| {
@ -668,6 +670,8 @@ pub fn apply_instance_overrides_cached(
&empty,
&safe_nested_override,
&safe_nested_derived,
&HashSet::new(),
(1.0, 1.0),
)
})
.collect();
@ -709,11 +713,17 @@ pub fn apply_instance_overrides_cached(
}
}
// Scale authored component-space geometry first. Derived size,
// transform, and font fields are already in instance space, so
// they overwrite this base rather than being scaled twice.
rescale_only(symbol_node, instance_size)
.into_iter()
// Hand the instance/symbol ratio to the resolver instead of
// pre-scaling the whole subtree: it scales branch by branch and
// drops the ratio wherever Figma's derived data already supplies
// instance-space geometry.
let scale = instance_scale(symbol_node, instance_size);
let mut derived_branch: HashSet<String> = HashSet::new();
mark_derived_branches(symbol_node, &node_derived, &mut derived_branch);
symbol_node
.children
.iter()
.cloned()
.map(|c| {
apply_to_node(
c,
@ -721,7 +731,37 @@ pub fn apply_instance_overrides_cached(
&node_derived,
&nested_override,
&nested_derived,
&derived_branch,
scale,
)
})
.collect()
}
/// Collect the guids of every node whose derived entry carries resolved
/// GEOMETRY, plus their ancestors. Those branches are already in
/// instance space, so the instance/symbol ratio must not touch them.
/// A derived entry without `size` / `transform` (a bare marker, or one
/// that only overrides paint) says nothing about geometry and leaves
/// its branch on the component-space path.
fn mark_derived_branches(
node: &TreeNode,
node_derived: &HashMap<String, FigValue>,
out: &mut HashSet<String>,
) -> bool {
let key = node.figma.get("guid").and_then(guid_to_string);
let mut has = key
.as_ref()
.and_then(|k| node_derived.get(k.as_str()))
.is_some_and(|d| d.get("size").is_some() || d.get("transform").is_some());
for child in &node.children {
// No short-circuit: every marked descendant must be recorded.
has |= mark_derived_branches(child, node_derived, out);
}
if has {
if let Some(key) = key {
out.insert(key);
}
}
has
}

38
crates/op-figma/src/instance/apply.rs
View file

@ -3,11 +3,11 @@
//! Strategy-2 resolution and the foreign-session anchoring.
use super::{guid_path_key, OVERRIDE_SKIP_KEYS};
use crate::common::round2;
use crate::common::{round2, scale_node_fields};
use crate::figma_types::FigVec2;
use crate::kiwi::FigValue;
use crate::tree::{guid_to_string, TreeNode};
use std::collections::HashMap;
use std::collections::{HashMap, HashSet};
/// Local-id getter — falls back to 0 when `guid.localID` is absent
/// (matches TS `a.figma.guid?.localID ?? 0`).
@ -115,6 +115,8 @@ pub(super) fn apply_to_node(
node_derived: &HashMap<String, FigValue>,
nested_override: &HashMap<String, Vec<FigValue>>,
nested_derived: &HashMap<String, Vec<FigValue>>,
derived_branch: &HashSet<String>,
scale: (f64, f64),
) -> TreeNode {
let key = node
.figma
@ -130,6 +132,34 @@ pub(super) fn apply_to_node(
children,
} = node;
// Instance rescale, branch by branch. Figma records resolved
// geometry ("derived") for the instance children it re-laid out
// and omits it entirely for branches that just came along for the
// ride. A branch that carries derived data anywhere inside it is
// already in instance space and must be left alone; only a branch
// with no derived data at all is still component-space and needs
// the instance/symbol ratio (that is the icon symbol whose artwork
// sat at (60,60) inside a 40x40 box). Scaling a derived branch
// instead pulled hidden price rows into view under text that kept
// its own resolved size.
let scales_here = !derived_branch.contains(&key);
let authored_size = figma.get("size").and_then(FigVec2::from_value);
if scales_here {
scale_node_fields(&mut figma, scale.0, scale.1);
}
// A node Figma resized itself re-bases its children on its own
// ratio. Inside an instance-space branch the ratio is spent, so
// children stay put — scaling them anyway left a 102 px row
// holding 6 px labels.
let child_scale = match (
authored_size,
d.and_then(|d| d.get("size")).and_then(FigVec2::from_value),
) {
(Some(a), Some(dv)) if a.x.abs() > 0.001 && a.y.abs() > 0.001 => (dv.x / a.x, dv.y / a.y),
_ if !scales_here => (1.0, 1.0),
_ => scale,
};
if d.is_none() && ov.is_none() && nested_ov.is_none() && nested_d.is_none() {
return TreeNode {
figma,
@ -142,6 +172,8 @@ pub(super) fn apply_to_node(
node_derived,
nested_override,
nested_derived,
derived_branch,
child_scale,
)
})
.collect(),
@ -235,6 +267,8 @@ pub(super) fn apply_to_node(
node_derived,
nested_override,
nested_derived,
derived_branch,
child_scale,
)
})
.collect(),

14
crates/op-figma/src/instance/assignment.rs
View file

@ -241,6 +241,20 @@ pub fn seed_assignments_from_instances(
}
}
/// Ratio between an instance's box and its symbol's, `(1.0, 1.0)`
/// when either is missing or degenerate.
pub(super) fn instance_scale(symbol_node: &TreeNode, instance_size: Option<FigVec2>) -> (f64, f64) {
if let (Some(size), Some(Some(sym_size))) = (
instance_size,
symbol_node.figma.get("size").map(FigVec2::from_value),
) {
if sym_size.x != 0.0 && sym_size.y != 0.0 {
return (size.x / sym_size.x, size.y / sym_size.y);
}
}
(1.0, 1.0)
}
/// Clone the symbol children rescaled to the instance size: the
/// no-override fast path, also the fallback when a guessed mapping
/// fails the confidence gate.