Drop the OsmAnd-recolor map theme, add offline labels and a lighter palette nudge

Remove osmand-style.js (the per-layer color-patching approach) and its
docs entirely — back to the plain OpenFreeMap "liberty" style online,
and protomaps-themes-base's stock theme offline as the base.

Offline maps previously had no text labels at all: the
protomaps-themes-base layers() call never passed a lang option, which
is required to include its label layers. Fixed, backed by vendored
Noto Sans Regular/Italic/Medium glyph PBFs (ranges 0-255 and 256-511
only — Basic Latin + Latin-1 Supplement + Latin Extended-A, enough for
accented Central European place names; other scripts won't render
offline). Verified against the actual offline.pmtiles vector layer
schema that the name/name:en/script fields this expects are present.

Also nudge a handful of OFFLINE_THEME color roles (background, water,
wood, buildings, the two road-importance tiers) towards the online
style's actual palette (sampled from its style JSON) so switching
Online/Offline doesn't look like two different apps — deliberately
partial, not the removed full recolor.

public/js/map.js

@@ -7,24 +7,41 @@ import {
 import { RadarControl } from "/js/radar.js";
 import { GpxPanelControl } from "/js/gpx.js";
 import { GnssControl } from "/js/gnss.js";
-import { onlineStyle, offlineTheme } from "/js/osmand-style.js";
 import { LAYERS_ICON } from "/js/icons.js";
 import { notifySidePanelOpen, onlyOneSidePanelOpen } from "/js/panels.js";
 
 const CENTER = [17.1077, 48.1486];
 const ZOOM = 13;
+const ONLINE_STYLE = "https://tiles.openfreemap.org/styles/liberty";
 
 const protocol = new pmtiles.Protocol();
 addProtocol("pmtiles", protocol.tile);
 
-// No label layers here (see docs/architecture.adoc): rendering text needs a
-// glyphs server, which the offline style deliberately does not depend on.
+// A few color roles nudged from protomaps-themes-base's stock "light" theme
+// towards the online OpenFreeMap "liberty" style's actual palette (sampled
+// from its style JSON — see docs/architecture.adoc), so switching between
+// Online/Offline doesn't look like two different apps. Not a full recolor:
+// most roles (labels, casings, minor terrain fills, ...) are left at their
+// theme defaults.
+const OFFLINE_THEME = {
+  ...protomaps_themes_base.namedTheme("light"),
+  background: "#f8f4f0",
+  earth: "#f8f4f0",
+  water: "#9ebdff",
+  wood_a: "#ace38c",
+  wood_b: "#ace38c",
+  buildings: "#dcd9d6",
+  highway: "#f2934a",
+  major: "#ffeeaa",
+  link: "#ffeeaa",
+};
+
 function offlineStyle() {
-  const theme = offlineTheme(protomaps_themes_base.namedTheme("light"));
   const pmtilesUrl = `${window.location.origin}/tiles/offline.pmtiles`;
 
   return {
     version: 8,
+    glyphs: `${window.location.origin}/vendor/fonts/{fontstack}/{range}.pbf`,
     sources: {
       offline: {
         type: "vector",
@@ -32,7 +49,10 @@ function offlineStyle() {
         attribution: "© OpenStreetMap contributors",
       },
     },
-    layers: protomaps_themes_base.layers("offline", theme),
+    // lang: "en" pulls in labels_layers (see docs/architecture.adoc) — only
+    // the Latin-script glyph ranges are vendored, so labels using other
+    // scripts won't render offline.
+    layers: protomaps_themes_base.layers("offline", OFFLINE_THEME, { lang: "en" }),
   };
 }
 
@@ -83,7 +103,7 @@ class LayerToggleControl {
 
 const map = new MaplibreMap({
   container: "map",
-  style: await onlineStyle(),
+  style: ONLINE_STYLE,
   center: CENTER,
   zoom: ZOOM,
 });
@@ -108,9 +128,9 @@ new GpxPanelControl(map).mount(sidebar);
 new RadarControl(map).mount(sidebar);
 new GnssControl(map).mount(sidebar);
 
-async function applyStyle(name) {
+function applyStyle(name) {
   layerToggle.setActive(name);
-  map.setStyle(name === "offline" ? offlineStyle() : await onlineStyle());
+  map.setStyle(name === "offline" ? offlineStyle() : ONLINE_STYLE);
 }
 
 // If a local PMTiles file is present, prefer it as the default style — its

public/js/osmand-style.js

@@ -1,160 +0,0 @@
-// Approximates the look of OsmAnd's own map render (osmand.net/map — muted
-// earth tones, cream background, orange roads) without depending on their
-// tile server: OsmAnd's terms restrict tile use to "personal, non-commercial
-// use within OsmAnd applications and platforms", which this app isn't.
-//
-// One shared palette drives two independent recolorings so Online and
-// Offline look consistent: OpenFreeMap's "liberty" vector style (paint
-// colors patched in place, see recolorLayer) for Online, and a custom
-// protomaps-themes-base Theme (see offlineTheme) for Offline.
-
-const PALETTE = {
-  background: "#f1ecd7",
-  water: "#aad3df",
-  wood: "#c8dfb0",
-  park: "#d3e8b8",
-  landuse: "#ece4c6",
-  building: "#d9cead",
-  buildingOutline: "#c7bb92",
-  roadMajor: "#eb9d43",
-  roadMajorCasing: "#c9822c",
-  roadMinor: "#fdf8ee",
-  roadMinorCasing: "#cfc09a",
-  boundary: "#a98fc2",
-};
-
-const LIBERTY_STYLE_URL = "https://tiles.openfreemap.org/styles/liberty";
-let cachedOnlineStyle = null;
-
-// Fetches OpenFreeMap's "liberty" style and recolors it in place. Cached —
-// the recoloring is pure, and re-fetching on every Online/Offline toggle
-// would be wasteful.
-export async function onlineStyle() {
-  if (cachedOnlineStyle) return cachedOnlineStyle;
-
-  const response = await fetch(LIBERTY_STYLE_URL);
-  const style = await response.json();
-  style.layers = style.layers.map(recolorLayer);
-  cachedOnlineStyle = style;
-  return style;
-}
-
-// Overrides the color roles that define the "look" on top of a
-// protomaps-themes-base Theme (e.g. namedTheme("light")), leaving roles it
-// doesn't set (labels, rail, tunnels, POI colors) at their defaults.
-export function offlineTheme(baseTheme) {
-  return {
-    ...baseTheme,
-    background: PALETTE.background,
-    earth: PALETTE.background,
-    water: PALETTE.water,
-    wood_a: PALETTE.wood,
-    wood_b: PALETTE.wood,
-    park_a: PALETTE.park,
-    park_b: PALETTE.park,
-    scrub_a: PALETTE.park,
-    scrub_b: PALETTE.park,
-    pedestrian: PALETTE.landuse,
-    industrial: PALETTE.landuse,
-    school: PALETTE.landuse,
-    hospital: PALETTE.landuse,
-    buildings: PALETTE.building,
-    highway_casing_early: PALETTE.roadMajorCasing,
-    highway_casing_late: PALETTE.roadMajorCasing,
-    highway: PALETTE.roadMajor,
-    major_casing_early: PALETTE.roadMajorCasing,
-    major_casing_late: PALETTE.roadMajorCasing,
-    major: PALETTE.roadMajor,
-    link_casing: PALETTE.roadMajorCasing,
-    link: PALETTE.roadMajor,
-    minor_casing: PALETTE.roadMinorCasing,
-    minor_service_casing: PALETTE.roadMinorCasing,
-    minor_a: PALETTE.roadMinor,
-    minor_b: PALETTE.roadMinor,
-    other: PALETTE.roadMinor,
-    minor_service: PALETTE.roadMinor,
-    boundaries: PALETTE.boundary,
-  };
-}
-
-const FILL_PROP = /^(background-color|fill-color|line-color|fill-extrusion-color)$/;
-const OUTLINE_PROP = /outline-color$/;
-
-const FILL_COLOR = {
-  background: PALETTE.background,
-  water: PALETTE.water,
-  wood: PALETTE.wood,
-  park: PALETTE.park,
-  landuse: PALETTE.landuse,
-  building: PALETTE.building,
-  roadMajor: PALETTE.roadMajor,
-  roadMinor: PALETTE.roadMinor,
-  boundary: PALETTE.boundary,
-};
-
-const OUTLINE_COLOR = {
-  building: PALETTE.buildingOutline,
-  roadMajor: PALETTE.roadMajorCasing,
-  roadMinor: PALETTE.roadMinorCasing,
-  park: "#bcdb9a",
-};
-
-// Maps a "liberty" style layer id to one of the categories above, based on
-// the id naming conventions OpenFreeMap's style uses (verified against its
-// actual layer list — see docs/architecture.adoc). Returns null for
-// anything left at its original color: labels/icons (all "symbol" layers,
-// filtered by type below before this even runs), railways, and minor
-// terrain fills (ice/wetland/sand) that aren't part of OsmAnd's signature
-// look.
-function categoryFor(layerId) {
-  if (layerId === "background") return "background";
-  if (/rail/.test(layerId)) return null;
-  if (/^water/.test(layerId)) return "water";
-  if (/^landcover_wood/.test(layerId)) return "wood";
-  if (/^(park|landcover_grass)/.test(layerId)) return "park";
-  if (/^landuse/.test(layerId)) return "landuse";
-  if (/^building/.test(layerId)) return "building";
-  if (/^(road|bridge|tunnel)_(motorway|trunk_primary)/.test(layerId)) return "roadMajor";
-  if (/^(road|bridge|tunnel)_/.test(layerId)) return "roadMinor";
-  if (/^boundary/.test(layerId)) return "boundary";
-  return null;
-}
-
-const RECOLORABLE_TYPES = new Set(["background", "fill", "line", "fill-extrusion"]);
-
-function recolorLayer(layer) {
-  if (!RECOLORABLE_TYPES.has(layer.type) || !layer.paint) return layer;
-
-  const category = categoryFor(layer.id);
-  if (!category) return layer;
-
-  const paint = { ...layer.paint };
-  for (const [prop, value] of Object.entries(paint)) {
-    if (OUTLINE_PROP.test(prop) && OUTLINE_COLOR[category]) {
-      paint[prop] = replaceColors(value, OUTLINE_COLOR[category]);
-    } else if (FILL_PROP.test(prop)) {
-      paint[prop] = replaceColors(value, FILL_COLOR[category]);
-    }
-  }
-
-  return { ...layer, paint };
-}
-
-const COLOR_PATTERN = /^#[0-9a-f]{3,8}$/i;
-const COLOR_FN_PATTERN = /^(rgb|hsl)a?\(/i;
-
-// Walks a paint value — a flat color string, or a MapLibre expression like
-// ["interpolate", ["linear"], ["zoom"], 5, "hsl(26,87%,62%)", 6, "#fc8"] —
-// and swaps every color-shaped string for `newColor`, leaving operators,
-// zoom/get references and numbers untouched. Generic across expression
-// types (interpolate/match/case/step/...) since it never inspects the
-// expression's operator, only whether each leaf looks like a color.
-function replaceColors(value, newColor) {
-  if (typeof value === "string") {
-    return COLOR_PATTERN.test(value) || COLOR_FN_PATTERN.test(value) ? newColor : value;
-  }
-  if (Array.isArray(value)) {
-    return value.map((item) => replaceColors(item, newColor));
-  }
-  return value;
-}

public/vendor/fonts/OFL.txt

@@ -0,0 +1,93 @@
+Copyright 2022 The Noto Project Authors (https://github.com/notofonts)
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+https://scripts.sil.org/OFL
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
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+writer or other person who contributed to the Font Software.
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