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feat(map): a character of a font as a marker, as QGIS's font markers draw one - #926
A point's marker, and a marker along a line, can now be a character of an installed font (Marker::Char). Map signs are often drawn this way, and QGIS calls them font markers.
Placement, as QGIS 4.2.3 does it (measured in its own renders):
the size is the font's em;
the character is centred on its advance width;
its baseline sits half the font's ascent below the point.
Fallbacks:
a family the machine lacks draws in the label font, as a label's does;
a character no font here has draws a circle of its size, so the point never vanishes.
Command:
layer.marker takes "char" and "font";
a stroke's markers take "mark": "character" with "char" and "font".
Symbology pane:
Shape › Character shows the character and a font picker (the label pane's picker, now shared);
legend patches and the stroke preview draw the character.
QGIS import:
FontMarker becomes a character marker on points, where it used to be a circle;
it also becomes one along marker lines, where it used to be left out;
several characters, font styles and anchors off the centre are noted.
Compatibility
Saved projects: shapes save and load exactly as before; a test pins this. Symbol stays Copy: a font name is kept once per run (FontName).
Hostile files: a crafted file's names are bounded in length and number, and junk reads as the label font.
GPU: the map view has no template for characters, so only a layer that draws one renders on the CPU. Other layers are unchanged, including the parity tests.
Commands: the new parameters are additions; existing calls behave as before.
SMV25 (pixels that differ from QGIS)
View
Before
After
Old town
7.2 %
6.8 %
Forest
3.4 %
3.3 %
Overview
11.0 %
10.9 %
SMV25 draws its map signs from swisstopo's DKM_Symbole font: 66 point symbols and 207 line symbols. Where RustGIS drew circles or left them out, it now draws QGIS's signs.
The next piece (3b) stacks several marks on a point, with offsets and rotation by a field. Half of SMV25's point signs are a white character under a coloured one, and 51 turn by - "WINKEL".
Tests
map: shapes keep their saved form; character round trip; hostile font names.
QGIS import: font markers on points and along lines.
engine:layer.marker and stroke markers with characters, an export, and junk input.
render: a 60 pt "L" checked for position and shape; the GPU fallback; the circle for a missing character; marks along a line.
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Reviewing files that changed from the base of the PR and between bb519dd and 74c781f.
Files selected for processing: 8
crates/engine/src/cmd/layer.rs
crates/engine/src/tests.rs
crates/map/src/qgis/symbol.rs
crates/map/src/qgis/tests.rs
crates/map/src/symbology.rs
crates/render/src/lib.rs
crates/ui-egui/src/labelpane.rs
crates/ui-egui/src/panes.rs
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Walkthrough
The change adds font-character markers for points and lines. It updates marker commands, rendering, editor controls, and QGIS import. It also adds tests and documentation for character-marker behavior.
Changes: Character marker support
Layer / File(s)
Summary
Glyph contract and marker commands crates/map/src/symbology.rs, crates/map/src/lib.rs, crates/engine/src/cmd/layer.rs, crates/engine/src/tests.rs
The marker model adds Marker::Char(Glyph) and font-name handling. Commands accept character and font parameters for point and line markers, preserve an existing glyph font in supported updates, and reject invalid or incompatible inputs. Tests cover these behaviors.
Font lookup and glyph rendering crates/render/src/text.rs, crates/render/src/glyphs.rs, crates/render/src/lib.rs, crates/render/src/mesh.rs, crates/render/src/line_markers.rs
The renderer resolves installed font faces, shapes glyph outlines, and draws character markers. Marker culling uses glyph reach. Character markers on point and multipoint geometry use the CPU fallback.
Point and line marker editing crates/ui-egui/src/labelpane.rs, crates/ui-egui/src/panes.rs, docs/user-guide/cartography.md
The editor adds character and font controls and previews glyph markers. The guide documents character markers and includes point and line command examples.
QGIS font markers convert to glyph markers on points and marker lines. Tests check converted glyph data and approximation notes. The workspace guide updates its description of QGIS font-marker support.
sequenceDiagram
participant MarkerEditor
participant LayerCommand
participant MarkerModel
participant Renderer
participant FontLookup
MarkerEditor->>LayerCommand: Submit character and font
LayerCommand->>MarkerModel: Create or update Glyph marker
MarkerModel->>Renderer: Provide Marker::Char
Renderer->>FontLookup: Resolve installed font face
FontLookup-->>Renderer: Return font face or fallback
Loading
Possibly related issues
opengeos/RustGIS#882 — This change imports QGIS font markers as character markers on points and marker lines, matching the issue’s font-marker parity work.
Possibly related PRs
opengeos/RustGIS#900 — Adds line-stroke marker contracts and rendering, which this change extends with character markers.
opengeos/RustGIS#825 — Adds QGIS symbol import; this change converts font markers that were previously approximated or omitted.
opengeos/RustGIS#824 — Adds installed-font indexing and family lookup used to resolve character-marker fonts.
Suggested reviewers:giswqs
Merge Risk: Low · up to 74c78
Character markers may clip at image edges for sufficiently large glyphs. The trigger has not been demonstrated, so this is a bounded follow-up rather than an established merge blocker.
Pre-merge checks: 4 · 1
Failed checks: 1 inconclusive
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Docstring Coverage
Docstring coverage is 66.10% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 59 functions across 12 files. (1 skipped:…
Write docstrings for the functions missing them to satisfy the coverage threshold.
Passed checks: 4 passed
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Explanation
Title check
The title clearly identifies the main change: adding character-of-font markers for map rendering and QGIS font markers.
Description check
The description explains the feature, compatibility, fallbacks, affected areas, testing scope, measured results, and related issue. It uses headings different from the template, but it provides the re…
Linked Issues check
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Check skipped because no linked issues were found for this pull request.
Full details: Description check
Explanation
The description explains the feature, compatibility, fallbacks, affected areas, testing scope, measured results, and related issue. It uses headings different from the template, but it provides the required information and is mostly complete.
Full details: Docstring Coverage
Explanation
Docstring coverage is 66.10% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 59 functions across 12 files. (1 skipped: 1 too large.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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A rabbit draws a glyph in flight, With letters set in fonts just right. Along the roads and on the map, Each marker finds its place to tap. The carrot waits; the tests all pass.
Comment @coderabbitai help to get the list of available commands.
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Performance (medium confidence): while the font index is still warming up (settled == false) nothing is cached, so every character marker re-parses the outline from the font on every call. marker_path and marker_reach each call shape, so that is at least two parses per point per frame. A layer with thousands of points would stall the UI until indexing finishes. Consider caching the label-font fallback under a separate "provisional" key, or at least memoising it per render pass.
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Declining. Nothing is cached only while the installed families are still being indexed, which happens once at startup. During that time a glyph is outlined from an already-loaded face, which takes microseconds next to filling the path, and it is cached as soon as indexing settles. Caching the provisional label-font shape would need a separate key and an invalidation step to save a short transient.
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Quality (medium confidence): if char is given together with a shape mark (e.g. "mark":"circle","char":"x"), the char silently wins. layer.marker rejects the same combination with "give a shape or a char, not both". The two commands should behave the same, so return an error here too. Only mark absent or "character" should be allowed to combine with char. Also, a non-string font (font.and_then(Value::as_str)) is silently ignored.
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Fixed the main point in 74c781f: a stroke's markers with a shape mark and a char is now refused with "give a shape or a char, not both", as layer.marker does (engine test added). A non-string font is left as it is: layer.marker and labels.style read font the same way (ps, a non-string means none), so the commands stay consistent.
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Quality (low-medium confidence): the point symbol editor passes the fixed salt "marker_char". If more than one symbol editor is shown at once (for example per-class editors), the ComboBox ids and the search temp id will collide. Include the layer or class id in the salt, as the stroke editor does with its index. Also, every keystroke in the character box runs a command, so each one adds an undo entry.
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Declining. The symbology pane shows one point symbol editor at a time (the layer's symbol; per-class symbols are edited one at a time too), so the fixed salt doesn't collide. The character box has char_limit(2) and runs a command only when the character changes, so each typed character is one undo step, which is what a change of marker should be.
I read the diff and the surrounding source but didn't build or run anything. The PR adds Marker::Char, a character of an installed font used as a marker on points and along lines. It is carefully built: it avoids panics, bounds hostile input, and keeps the saved form of the existing shapes. I found no blocking bugs.
Bugs
None confirmed. I checked glyph outline construction (the y-flip, contour closing and fill direction), the cache locking, the GPU fallback (TessError::Refused) and the Marker as u32 replacement in mesh.rs. I also looked for other exhaustive matches on Marker. All looked correct.
Security
No issues. Font names are length-bounded and capped at 4096 distinct names, so the leaked &'static str interner can't grow without limit from a crafted project file. Glyph curves are capped at 20,000 and junk font values read as the label font.
Performance
Medium confidence: crates/render/src/glyphs.rs:33. While the font index is warming up, results aren't cached. Each point therefore re-parses its outline, at least twice per frame (marker_path and marker_reach). This could stall the UI on large point layers until indexing finishes.
Low confidence: marker_path clones and transforms the cached path per point, and takes a global mutex per lookup. This is acceptable now, but it is the next cost to look at if character layers get big.
Quality
Medium confidence: crates/engine/src/cmd/layer.rs:528. In layer.lineStrokes, char combined with a shape mark silently wins, while layer.marker rejects the same combination with an error. A non-string font is also silently ignored.
Low-medium confidence: crates/ui-egui/src/panes.rs:4225. The point symbol editor uses the fixed salt "marker_char", which risks ComboBox id collisions if several editors are shown at once. Each keystroke in the character box also creates an undo entry.
Low confidence: layer.marker with font alone on a non-character marker is a silent no-op.
Nit: the stroke reach calculation now uses 2 * 0.6 = 1.2 times the size for ordinary shapes. That is harmless, but it slightly widens the culling window.
Nit: the glyph outline code is not drawn with an explicit fill rule here. It relies on the existing draw_marker behaviour, which should be fine for nonzero winding.
AGENTS.md
No unwrap, expect or panic! in non-test code, and no unsafe. Box::leak is used but is bounded.
UI strings use tl!. The new "Character" and "Font" labels need catalog entries only before release, which the maintainer handles.
The docs are updated, and wasm compatibility looks fine (no new std-only time or file access).
The new hostile_params_never_panic coverage isn't visible in the diff for the new char and font parameters. The engine tests do cover empty, non-string and conflicting inputs. Please confirm the junk-parameter test exercises layer.marker with char.
Change size
Compared: the whole PR against main (merge base 797ccab to PR head 9508898)
…draw one
A point's marker, and a marker along a line, can be a character of an
installed font (Marker::Char): the size is the font's em, the character's
advance is centred on the point and its baseline half the font's ascent
below it, as QGIS 4.2 places a font marker (measured in its renders). A
family the machine lacks draws in the label font; a character no font has
draws a circle, so the point still shows.
- map: Glyph (character and family) and FontName, a family name kept once
so Symbol stays Copy; shapes save and load as before, a crafted file's
names are bounded and junk reads as the label font.
- render: glyphs.rs reads the outline (ab_glyph) once per character; the
GPU has no template for it, so such a layer draws on the CPU.
- QGIS import: FontMarker becomes a character marker on points and along
marker lines (was a circle, and left out along lines); several
characters, styles and anchors off the centre are noted.
- layer.marker takes "char" and "font"; a stroke's markers take
"mark": "character" with "char" and "font".
- Symbology pane: Shape › Character, with the character and a font
picker (the label pane's, shared); legend patches draw the character.
Part of opengeos#882 (piece 3).
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Performance (medium confidence): marker_path runs per feature, and for a character each call takes the global KEPT mutex, does a HashMap lookup, and clones the whole glyph Path before transforming it. draw_marker also calls marker_reach, which locks and looks up again. On a large point layer that is two lock+lookups and one path allocation per point. Past MAX_KEPT entries, or while the families are still being indexed (settled == false), each call also re-reads and re-outlines the glyph from the font. Consider resolving the Arc<CharShape> once per layer or draw call and reusing it, and transforming without the intermediate clone where tiny-skia allows.
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Declining. For a character, each point takes an uncontended lock, one hash lookup and a clone of a small path that is then transformed and filled anyway. The fill is far more costly than the rest. Caching transformed paths per size and angle would grow memory for little gain. The uncached case is the startup indexing window, covered in the reply above.
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Nit (high confidence): this error lists the accepted marks but leaves out the new "character". Also, font that isn't a string is silently ignored (Value::as_str), whereas a non-string char is rejected, so the two are handled inconsistently.
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Nit (low-medium confidence): the font-search state id is Id::unique((salt, "search")), with no layer in it. The point-symbol editor's salt is the constant "marker_char", so a search typed for one layer carries over to the next layer's picker. The label pane scopes its search id with layer_key. Consider including the layer id here.
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Declining as low impact. The search box keeps what was typed only until a font is chosen (end_search clears it), and only one point editor shows at a time. Carrying a half-typed search to the next layer's picker is harmless.
The PR adds Marker::Char(Glyph), character-of-a-font markers on points and along lines. It also adds QGIS font-marker import, the layer.marker and layer.lineStrokes parameters, the UI pickers, and a CPU-only render path. I found no crash or correctness bugs. I read the diff and the surrounding code but did not build or run anything. The points below are small.
Bugs
None found. I checked:
the Marker as u32 cast replaced in mesh.rs;
fill rule (glyphs fill with Winding, which suits outlines);
the serde form of old shape markers (the new test pins it);
the bounded font-name interning (4096 names);
the clamped, finite-checked outline reading.
Security
None found. A crafted font name or glyph is bounded by MAX_FONT_NAMES, MAX_KEPT and MAX_CURVES. Junk in a project file reads as the label font instead of failing.
Performance
crates/render/src/lib.rs:1256 (medium): marker_path runs per feature, and for a character each call takes a global mutex, does a HashMap lookup and clones the glyph Path. marker_reach does another lock and lookup per point. Large point layers will feel this. When the cache is full or the font index isn't ready, each call also re-reads the outline from the font. Resolving the shape once per layer or draw would fix it.
Quality
crates/engine/src/cmd/layer.rs:523 (high, nit): the invalid-mark error doesn't list "character". A non-string font is silently ignored, while a non-string char is an error.
crates/ui-egui/src/panes.rs:4291 (low-medium, nit): the font-search state id has no layer in it, so a search typed for one layer carries over to the next layer's picker.
AGENTS.md
No unwrap, expect or panic! in non-test code, and unsafe isn't used. The unwraps are all in tests.
Interface strings use tl!.
It's a command change, with a regression test for hostile char input and error paths.
Docs are updated.
I couldn't verify ATTRIBUTION.md or the wasm build; no new asset files are added.
Change size
Compared: the whole PR against main (merge base bce9695 to PR head bb519dd).
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Review comment at @crates/render/src/lib.rs at line 742:
Update the off-image reach calculations in Ctx::marker and markers_tilted to use
marker_reach(s.marker) instead of the fixed 0.6 factor, keeping the existing
size, stroke-width, margin, and scale calculations unchanged.
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Inline comments:
Review comments at @crates/map/src/qgis/symbol.rs:
- Around line 511-513: Update the FontMarker character handling around `prop(p,
"chr")` to use QGIS’s default character `A` when `chr` is omitted or empty,
before reading the first character. Preserve the existing behavior for non-empty
`chr` values so point-marker and marker-line paths both retain the symbol layer.
- Around line 511-513: Decode QGIS escape sequences in the `chr` property before
creating the character iterator and selecting the first glyph. Preserve the
existing single-character approximation, but ensure escaped values such as
`~!_#!#_!~1~!_#!#_!~` select the decoded character rather than the escape
prefix.
Review comments at @crates/render/src/mesh.rs:
- Around line 273-279: Update gpu_may_turn to reject upright point layers
containing Marker::Char markers, so pitched views keep character markers on the
CPU. Preserve existing behavior for other marker types and layer orientations.
Review comments at @crates/ui-egui/src/labelpane.rs:
- Around line 491-493: Update the “Label font” selection branch so it sets
chosen to Some(None) only when the click changes the current selection, using
cur.is_some() as the guard; preserve the existing selection behavior otherwise.
---
Outside diff comments:
Review comments at @crates/render/src/lib.rs:
- Line 742: Update the off-image reach calculations in Ctx::marker and
markers_tilted to use marker_reach(s.marker) instead of the fixed 0.6 factor,
keeping the existing size, stroke-width, margin, and scale calculations
unchanged.
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Reviewing files that changed from the base of the PR and between bce9695 and 9508898.
Files selected for processing: 15
crates/engine/src/cmd/layer.rs
crates/engine/src/tests.rs
crates/map/src/lib.rs
crates/map/src/qgis/symbol.rs
crates/map/src/qgis/tests.rs
crates/map/src/symbology.rs
crates/render/src/glyphs.rs
crates/render/src/lib.rs
crates/render/src/line_markers.rs
crates/render/src/mesh.rs
crates/render/src/text.rs
crates/ui-egui/src/labelpane.rs
crates/ui-egui/src/panes.rs
docs/user-guide/cartography.md
docs/user-guide/workspace.md
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When a character extends beyond 0.6 of its size, this check can omit its selection highlight near the image edge. markers_tilted has the same fixed-reach check at Line 2422 and can omit the marker itself. Use marker_reach(s.marker) in both checks, as Ctx::stamp does at Line 787.
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Review comment at @crates/render/src/lib.rs at line 769:
Replace the fixed 0.6-size reach calculation in the selection-highlight cull and
the corresponding check in `markers_tilted` with `marker_reach(s.marker)`,
matching the reach calculation used by `Ctx::stamp` so glyphs extending beyond
the fixed estimate are not culled near the image edge.
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Inline comments:
Review comments at @crates/ui-egui/src/panes.rs:
- Line 4383: Update the character-marker preview rendering at the
LineMark::Marker(Marker::Char(g)) match and the point patch so transparent fill
colors fall back to the visible outline color when m.outline is enabled;
preserve the existing fill color when it is visible.
---
Outside diff comments:
Review comments at @crates/render/src/lib.rs:
- Line 769: Replace the fixed 0.6-size reach calculation in the
selection-highlight cull and the corresponding check in `markers_tilted` with
`marker_reach(s.marker)`, matching the reach calculation used by `Ctx::stamp` so
glyphs extending beyond the fixed estimate are not culled near the image edge.
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Files selected for processing: 4
crates/render/src/lib.rs
crates/ui-egui/src/labelpane.rs
crates/ui-egui/src/panes.rs
docs/user-guide/cartography.md
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…lted views keep characters on the CPU
- A FontMarker without chr, or with an empty one, draws QGIS's A; its escaped characters (~!_#!#_!~code~!_#!#_!~) are decoded.
- A tilted view with character markers standing up stays on the CPU: the GPU drew them as circles.
- A stroke's markers refuse a shape with a char, as layer.marker does; the mark error names "character".
- Choosing the label font again runs no command.
- A legend patch shows an outline-only character in its outline's colour.
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Perf (medium confidence):shape() is called per marker (via marker_path and again via marker_reach). Two cases skip the cache, so the outline is rebuilt for every point:
while the font index is still warming up (settled == false);
once KEPT holds MAX_KEPT entries, since a full cache never inserts.
marker_path then also clones the Path for each marker. A layer with many character markers could be slow in either case. Consider caching the unsettled result for the duration of one render, or looking the shape up once per symbol and not once per feature.
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Declining, as in the earlier thread (r4375012367). The warm-up case is the startup indexing window. A full cache needs 4096 distinct character/family pairs in use; SMV25, the heaviest real case here, uses a few hundred. Past that, glyphs are outlined again rather than evicting others, which keeps memory bounded on a crafted project. That trade-off is intended.
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Low confidence: only append_geometry refuses character markers on the GPU. marker_instances maps Marker::Char to the circle template (shape 0), and the selection highlight (collect_highlight, line ~481) and the upright markers in a tilted view (lib.rs ~1966) both call it directly. A selected character feature drawn on the GPU path would show as a haloed circle, not the character. Please check this on the GPU path, or note it as intended.
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Not a bug, as far as I can see. On the flat GPU path, collect_highlight runs only when gpu_done is set (lib.rs ~3162). For a layer with a character point, append_geometry refuses it, so the layer's collection fails, gpu_done stays false and its selection goes through ctx.highlight on the CPU, which draws the character's halo. The tilted upright case (lib.rs ~1966) can't reach the GPU any more: 74c781f makes gpu_may_turn decline a tilted view with standing character markers. So marker_instances never draws a Marker::Char, and its Char => 0 arm is only an exhaustive fallback.
I read the full diff and the surrounding code. I did not build the code or run the tests. I found no correctness bugs. The remaining points are minor performance, rendering-consistency and style concerns. Two are posted as inline comments. The third, a doc-comment nit, is listed here because its inline comment could not be placed on a diff line.
Bugs
Selected character markers on the GPU path (low confidence).marker_instances maps Marker::Char to the circle template. Only append_geometry refuses character markers. collect_highlight and the upright-marker path in lib.rs (~1966) call marker_instances directly. A selected character feature drawn on the GPU could show as a haloed circle instead of the character. Posted inline on mesh.rs.
Security
Nothing found. Font names are bounded in length and number (MAX_FONT_NAMES, Box::leak capped at 4096). Glyph curves are capped (MAX_CURVES). unescape_chr only slices at ASCII digit boundaries, and its loop always shortens the remaining text. Deserialize on junk fonts falls back to the label font, as the PR's test shows.
Performance
Uncached glyph outlines (medium confidence).glyphs::shape skips its cache while fonts are still being indexed, and again once 4096 entries are held. marker_path and marker_reach each call it per marker, and marker_path clones the Path every time. A layer with many character markers could rebuild the outline for every point. Posted inline on glyphs.rs.
Quality
The doc comment added on gpu_may_turn (crates/render/src/lib.rs, ~line 738) is now a very long line. Please re-wrap it. (Low confidence.)
layer.marker and line_markers take only the first char of the string, so a multi-codepoint grapheme is silently cut. The QGIS import notes this case, but the command does not. (Low confidence.)
qgis/tests.rs asserts report.notes.len() == 1, which will break whenever an unrelated note is added. Matching on the SVG note is sturdier. (Low confidence.)
AGENTS.md
No unwrap, panic or unsafe in the new non-test code. Mutex poisoning is handled.
UI strings use tl!.
The docs are updated.
Both the layer.marker and layer.lineStrokes hostile-parameter cases have regression tests.
Nothing in the diff touches wasm-specific code. OnceLock and Mutex are fine on wasm.
ATTRIBUTION.md and the third-party licence files are not touched, which is right: no new assets or dependencies appear in the diff.
Change size
Compared: the whole PR against main (merge base bce9695 to PR head 74c781f).
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What it does
A point's marker, and a marker along a line, can now be a character of an installed font (
Marker::Char). Map signs are often drawn this way, and QGIS calls them font markers.layer.markertakes"char"and"font";markerstake"mark": "character"with"char"and"font".FontMarkerbecomes a character marker on points, where it used to be a circle;Compatibility
SymbolstaysCopy: a font name is kept once per run (FontName).SMV25 (pixels that differ from QGIS)
SMV25 draws its map signs from swisstopo's
DKM_Symbolefont: 66 point symbols and 207 line symbols. Where RustGIS drew circles or left them out, it now draws QGIS's signs.The next piece (3b) stacks several marks on a point, with offsets and rotation by a field. Half of SMV25's point signs are a white character under a coloured one, and 51 turn by
- "WINKEL".Tests
layer.markerand stroke markers with characters, an export, and junk input.Part of #882.
Summary by CodeRabbit