From 1761875dba858a4c883c2f4d847ab00cc7f44dc8 Mon Sep 17 00:00:00 2001
From: AdaSzi115026 <81822538+AdaSzi@users.noreply.github.com>
Date: Fri, 30 Oct 2026 00:28:10 +0100
Subject: [PATCH 1/3] Add Maps: offline vector maps (first version)
Offline vector maps from OpenFreeMap. Download an area once over Wi-Fi and use it offline from the SD card.
First version (0.0.1), tested on the LilyGO T-Deck only.
---
Apps/Maps/CHANGELOG.md | 40 +
Apps/Maps/CMakeLists.txt | 13 +
Apps/Maps/LICENSE | 674 ++
Apps/Maps/README.md | 167 +
Apps/Maps/THIRD_PARTY.md | 18 +
Apps/Maps/docs/MEASUREMENTS.md | 220 +
Apps/Maps/docs/PLAN.md | 307 +
Apps/Maps/docs/images/about.png | Bin 0 -> 31092 bytes
Apps/Maps/docs/images/download-frame.png | Bin 0 -> 44277 bytes
Apps/Maps/docs/images/follow.png | Bin 0 -> 27163 bytes
Apps/Maps/docs/images/map-z14.png | Bin 0 -> 59878 bytes
Apps/Maps/docs/images/map-z16.png | Bin 0 -> 28472 bytes
Apps/Maps/docs/images/regions.png | Bin 0 -> 10798 bytes
Apps/Maps/host/CMakeLists.txt | 41 +
Apps/Maps/host/FakeFont.h | 51 +
Apps/Maps/host/FakePosition.h | 37 +
Apps/Maps/host/ImageDiff.h | 41 +
Apps/Maps/host/PlatformHost.cpp | 90 +
Apps/Maps/host/Png.cpp | 28 +
Apps/Maps/host/Png.h | 7 +
Apps/Maps/host/check_symbols.py | 88 +
Apps/Maps/host/device_run.py | 122 +
Apps/Maps/host/fetch_tiles.py | 245 +
Apps/Maps/host/prepare_tiles.cpp | 178 +
Apps/Maps/host/push_region.py | 42 +
Apps/Maps/host/render_tile.cpp | 130 +
Apps/Maps/host/tests.cpp | 2897 ++++++
Apps/Maps/host/third_party/miniz/LICENSE | 22 +
Apps/Maps/host/third_party/miniz/miniz.c | 7833 +++++++++++++++++
Apps/Maps/host/third_party/miniz/miniz.h | 1422 +++
Apps/Maps/host/ui_preview.cpp | 213 +
Apps/Maps/main/CMakeLists.txt | 8 +
Apps/Maps/main/Source/app/BinFontText.cpp | 154 +
Apps/Maps/main/Source/app/BinFontText.h | 48 +
Apps/Maps/main/Source/app/Debug.cpp | 144 +
Apps/Maps/main/Source/app/Debug.h | 49 +
Apps/Maps/main/Source/app/DisplayOutput.cpp | 115 +
Apps/Maps/main/Source/app/DisplayOutput.h | 45 +
Apps/Maps/main/Source/app/Downloader.cpp | 1015 +++
Apps/Maps/main/Source/app/Downloader.h | 169 +
Apps/Maps/main/Source/app/Input.cpp | 131 +
Apps/Maps/main/Source/app/Input.h | 54 +
Apps/Maps/main/Source/app/IoTask.cpp | 212 +
Apps/Maps/main/Source/app/IoTask.h | 92 +
Apps/Maps/main/Source/app/LocationSource.cpp | 42 +
Apps/Maps/main/Source/app/LocationSource.h | 32 +
Apps/Maps/main/Source/app/MapApp.cpp | 91 +
Apps/Maps/main/Source/app/MapInput.cpp | 485 +
Apps/Maps/main/Source/app/MapScreens.cpp | 455 +
Apps/Maps/main/Source/app/MapView.cpp | 739 ++
Apps/Maps/main/Source/app/MapView.h | 232 +
.../main/Source/app/PlatformTactility.cpp | 117 +
Apps/Maps/main/Source/app/RootCertificates.h | 103 +
Apps/Maps/main/Source/app/StallProbe.cpp | 92 +
Apps/Maps/main/Source/app/StallProbe.h | 51 +
Apps/Maps/main/Source/app/TileWorker.cpp | 791 ++
Apps/Maps/main/Source/app/TileWorker.h | 197 +
Apps/Maps/main/Source/mvt/ByteInput.cpp | 48 +
Apps/Maps/main/Source/mvt/ByteInput.h | 105 +
Apps/Maps/main/Source/mvt/InflateReader.cpp | 242 +
Apps/Maps/main/Source/mvt/InflateReader.h | 71 +
Apps/Maps/main/Source/mvt/MvtDecoder.cpp | 472 +
Apps/Maps/main/Source/mvt/MvtDecoder.h | 95 +
Apps/Maps/main/Source/mvt/Schema.cpp | 63 +
Apps/Maps/main/Source/mvt/Schema.h | 67 +
Apps/Maps/main/Source/platform/Platform.h | 36 +
Apps/Maps/main/Source/platform/Position.h | 40 +
Apps/Maps/main/Source/render/CacheIndex.cpp | 157 +
Apps/Maps/main/Source/render/CacheIndex.h | 77 +
Apps/Maps/main/Source/render/CacheWalker.cpp | 239 +
Apps/Maps/main/Source/render/CacheWalker.h | 66 +
Apps/Maps/main/Source/render/Compose.cpp | 96 +
Apps/Maps/main/Source/render/Compose.h | 29 +
.../main/Source/render/PreparedScanner.cpp | 183 +
.../Maps/main/Source/render/PreparedScanner.h | 46 +
Apps/Maps/main/Source/render/PreparedTile.cpp | 493 ++
Apps/Maps/main/Source/render/PreparedTile.h | 163 +
Apps/Maps/main/Source/render/Raster.cpp | 340 +
Apps/Maps/main/Source/render/Raster.h | 67 +
Apps/Maps/main/Source/render/Style.cpp | 456 +
Apps/Maps/main/Source/render/Style.h | 93 +
Apps/Maps/main/Source/render/TileCache.cpp | 131 +
Apps/Maps/main/Source/render/TileCache.h | 57 +
Apps/Maps/main/Source/render/TileCodec.cpp | 81 +
Apps/Maps/main/Source/render/TileCodec.h | 17 +
Apps/Maps/main/Source/render/TileRenderer.cpp | 409 +
Apps/Maps/main/Source/render/TileRenderer.h | 106 +
Apps/Maps/main/Source/tiles/DownloadPlan.cpp | 67 +
Apps/Maps/main/Source/tiles/DownloadPlan.h | 39 +
Apps/Maps/main/Source/tiles/IoQueue.h | 77 +
Apps/Maps/main/Source/tiles/RegionMeta.cpp | 154 +
Apps/Maps/main/Source/tiles/RegionMeta.h | 34 +
Apps/Maps/main/Source/tiles/TileJson.cpp | 81 +
Apps/Maps/main/Source/tiles/TileJson.h | 22 +
Apps/Maps/main/Source/tiles/TileMath.cpp | 89 +
Apps/Maps/main/Source/tiles/TileMath.h | 62 +
Apps/Maps/main/Source/tiles/TilePaths.cpp | 65 +
Apps/Maps/main/Source/tiles/TilePaths.h | 35 +
Apps/Maps/main/Source/tiles/TileStore.cpp | 151 +
Apps/Maps/main/Source/tiles/TileStore.h | 73 +
Apps/Maps/main/Source/ui/Canvas.cpp | 228 +
Apps/Maps/main/Source/ui/Canvas.h | 66 +
Apps/Maps/main/Source/ui/Controls.cpp | 184 +
Apps/Maps/main/Source/ui/Controls.h | 105 +
Apps/Maps/main/Source/ui/DownloadFrame.cpp | 82 +
Apps/Maps/main/Source/ui/DownloadFrame.h | 37 +
Apps/Maps/main/Source/ui/Gestures.cpp | 114 +
Apps/Maps/main/Source/ui/Gestures.h | 88 +
Apps/Maps/main/Source/ui/MapOverlay.cpp | 208 +
Apps/Maps/main/Source/ui/MapOverlay.h | 56 +
Apps/Maps/main/Source/ui/PositionTracker.cpp | 52 +
Apps/Maps/main/Source/ui/PositionTracker.h | 43 +
Apps/Maps/main/Source/ui/Settings.cpp | 148 +
Apps/Maps/main/Source/ui/Settings.h | 54 +
Apps/Maps/main/Source/ui/Widgets.cpp | 316 +
Apps/Maps/main/Source/ui/Widgets.h | 135 +
Apps/Maps/manifest.properties | 11 +
Apps/Maps/tests/fixtures/14-9058-5729.pbf | Bin 0 -> 232636 bytes
Apps/Maps/tests/fixtures/golden-14.png | Bin 0 -> 49798 bytes
Apps/Maps/tests/fixtures/golden-16.png | Bin 0 -> 26741 bytes
Apps/Maps/tests/fixtures/golden-18.png | Bin 0 -> 7125 bytes
Apps/Maps/tests/fixtures/golden.txt | 3 +
122 files changed, 28013 insertions(+)
create mode 100644 Apps/Maps/CHANGELOG.md
create mode 100644 Apps/Maps/CMakeLists.txt
create mode 100644 Apps/Maps/LICENSE
create mode 100644 Apps/Maps/README.md
create mode 100644 Apps/Maps/THIRD_PARTY.md
create mode 100644 Apps/Maps/docs/MEASUREMENTS.md
create mode 100644 Apps/Maps/docs/PLAN.md
create mode 100644 Apps/Maps/docs/images/about.png
create mode 100644 Apps/Maps/docs/images/download-frame.png
create mode 100644 Apps/Maps/docs/images/follow.png
create mode 100644 Apps/Maps/docs/images/map-z14.png
create mode 100644 Apps/Maps/docs/images/map-z16.png
create mode 100644 Apps/Maps/docs/images/regions.png
create mode 100644 Apps/Maps/host/CMakeLists.txt
create mode 100644 Apps/Maps/host/FakeFont.h
create mode 100644 Apps/Maps/host/FakePosition.h
create mode 100644 Apps/Maps/host/ImageDiff.h
create mode 100644 Apps/Maps/host/PlatformHost.cpp
create mode 100644 Apps/Maps/host/Png.cpp
create mode 100644 Apps/Maps/host/Png.h
create mode 100644 Apps/Maps/host/check_symbols.py
create mode 100644 Apps/Maps/host/device_run.py
create mode 100644 Apps/Maps/host/fetch_tiles.py
create mode 100644 Apps/Maps/host/prepare_tiles.cpp
create mode 100644 Apps/Maps/host/push_region.py
create mode 100644 Apps/Maps/host/render_tile.cpp
create mode 100644 Apps/Maps/host/tests.cpp
create mode 100644 Apps/Maps/host/third_party/miniz/LICENSE
create mode 100644 Apps/Maps/host/third_party/miniz/miniz.c
create mode 100644 Apps/Maps/host/third_party/miniz/miniz.h
create mode 100644 Apps/Maps/host/ui_preview.cpp
create mode 100644 Apps/Maps/main/CMakeLists.txt
create mode 100644 Apps/Maps/main/Source/app/BinFontText.cpp
create mode 100644 Apps/Maps/main/Source/app/BinFontText.h
create mode 100644 Apps/Maps/main/Source/app/Debug.cpp
create mode 100644 Apps/Maps/main/Source/app/Debug.h
create mode 100644 Apps/Maps/main/Source/app/DisplayOutput.cpp
create mode 100644 Apps/Maps/main/Source/app/DisplayOutput.h
create mode 100644 Apps/Maps/main/Source/app/Downloader.cpp
create mode 100644 Apps/Maps/main/Source/app/Downloader.h
create mode 100644 Apps/Maps/main/Source/app/Input.cpp
create mode 100644 Apps/Maps/main/Source/app/Input.h
create mode 100644 Apps/Maps/main/Source/app/IoTask.cpp
create mode 100644 Apps/Maps/main/Source/app/IoTask.h
create mode 100644 Apps/Maps/main/Source/app/LocationSource.cpp
create mode 100644 Apps/Maps/main/Source/app/LocationSource.h
create mode 100644 Apps/Maps/main/Source/app/MapApp.cpp
create mode 100644 Apps/Maps/main/Source/app/MapInput.cpp
create mode 100644 Apps/Maps/main/Source/app/MapScreens.cpp
create mode 100644 Apps/Maps/main/Source/app/MapView.cpp
create mode 100644 Apps/Maps/main/Source/app/MapView.h
create mode 100644 Apps/Maps/main/Source/app/PlatformTactility.cpp
create mode 100644 Apps/Maps/main/Source/app/RootCertificates.h
create mode 100644 Apps/Maps/main/Source/app/StallProbe.cpp
create mode 100644 Apps/Maps/main/Source/app/StallProbe.h
create mode 100644 Apps/Maps/main/Source/app/TileWorker.cpp
create mode 100644 Apps/Maps/main/Source/app/TileWorker.h
create mode 100644 Apps/Maps/main/Source/mvt/ByteInput.cpp
create mode 100644 Apps/Maps/main/Source/mvt/ByteInput.h
create mode 100644 Apps/Maps/main/Source/mvt/InflateReader.cpp
create mode 100644 Apps/Maps/main/Source/mvt/InflateReader.h
create mode 100644 Apps/Maps/main/Source/mvt/MvtDecoder.cpp
create mode 100644 Apps/Maps/main/Source/mvt/MvtDecoder.h
create mode 100644 Apps/Maps/main/Source/mvt/Schema.cpp
create mode 100644 Apps/Maps/main/Source/mvt/Schema.h
create mode 100644 Apps/Maps/main/Source/platform/Platform.h
create mode 100644 Apps/Maps/main/Source/platform/Position.h
create mode 100644 Apps/Maps/main/Source/render/CacheIndex.cpp
create mode 100644 Apps/Maps/main/Source/render/CacheIndex.h
create mode 100644 Apps/Maps/main/Source/render/CacheWalker.cpp
create mode 100644 Apps/Maps/main/Source/render/CacheWalker.h
create mode 100644 Apps/Maps/main/Source/render/Compose.cpp
create mode 100644 Apps/Maps/main/Source/render/Compose.h
create mode 100644 Apps/Maps/main/Source/render/PreparedScanner.cpp
create mode 100644 Apps/Maps/main/Source/render/PreparedScanner.h
create mode 100644 Apps/Maps/main/Source/render/PreparedTile.cpp
create mode 100644 Apps/Maps/main/Source/render/PreparedTile.h
create mode 100644 Apps/Maps/main/Source/render/Raster.cpp
create mode 100644 Apps/Maps/main/Source/render/Raster.h
create mode 100644 Apps/Maps/main/Source/render/Style.cpp
create mode 100644 Apps/Maps/main/Source/render/Style.h
create mode 100644 Apps/Maps/main/Source/render/TileCache.cpp
create mode 100644 Apps/Maps/main/Source/render/TileCache.h
create mode 100644 Apps/Maps/main/Source/render/TileCodec.cpp
create mode 100644 Apps/Maps/main/Source/render/TileCodec.h
create mode 100644 Apps/Maps/main/Source/render/TileRenderer.cpp
create mode 100644 Apps/Maps/main/Source/render/TileRenderer.h
create mode 100644 Apps/Maps/main/Source/tiles/DownloadPlan.cpp
create mode 100644 Apps/Maps/main/Source/tiles/DownloadPlan.h
create mode 100644 Apps/Maps/main/Source/tiles/IoQueue.h
create mode 100644 Apps/Maps/main/Source/tiles/RegionMeta.cpp
create mode 100644 Apps/Maps/main/Source/tiles/RegionMeta.h
create mode 100644 Apps/Maps/main/Source/tiles/TileJson.cpp
create mode 100644 Apps/Maps/main/Source/tiles/TileJson.h
create mode 100644 Apps/Maps/main/Source/tiles/TileMath.cpp
create mode 100644 Apps/Maps/main/Source/tiles/TileMath.h
create mode 100644 Apps/Maps/main/Source/tiles/TilePaths.cpp
create mode 100644 Apps/Maps/main/Source/tiles/TilePaths.h
create mode 100644 Apps/Maps/main/Source/tiles/TileStore.cpp
create mode 100644 Apps/Maps/main/Source/tiles/TileStore.h
create mode 100644 Apps/Maps/main/Source/ui/Canvas.cpp
create mode 100644 Apps/Maps/main/Source/ui/Canvas.h
create mode 100644 Apps/Maps/main/Source/ui/Controls.cpp
create mode 100644 Apps/Maps/main/Source/ui/Controls.h
create mode 100644 Apps/Maps/main/Source/ui/DownloadFrame.cpp
create mode 100644 Apps/Maps/main/Source/ui/DownloadFrame.h
create mode 100644 Apps/Maps/main/Source/ui/Gestures.cpp
create mode 100644 Apps/Maps/main/Source/ui/Gestures.h
create mode 100644 Apps/Maps/main/Source/ui/MapOverlay.cpp
create mode 100644 Apps/Maps/main/Source/ui/MapOverlay.h
create mode 100644 Apps/Maps/main/Source/ui/PositionTracker.cpp
create mode 100644 Apps/Maps/main/Source/ui/PositionTracker.h
create mode 100644 Apps/Maps/main/Source/ui/Settings.cpp
create mode 100644 Apps/Maps/main/Source/ui/Settings.h
create mode 100644 Apps/Maps/main/Source/ui/Widgets.cpp
create mode 100644 Apps/Maps/main/Source/ui/Widgets.h
create mode 100644 Apps/Maps/manifest.properties
create mode 100644 Apps/Maps/tests/fixtures/14-9058-5729.pbf
create mode 100644 Apps/Maps/tests/fixtures/golden-14.png
create mode 100644 Apps/Maps/tests/fixtures/golden-16.png
create mode 100644 Apps/Maps/tests/fixtures/golden-18.png
create mode 100644 Apps/Maps/tests/fixtures/golden.txt
diff --git a/Apps/Maps/CHANGELOG.md b/Apps/Maps/CHANGELOG.md
new file mode 100644
index 0000000..a23f578
--- /dev/null
+++ b/Apps/Maps/CHANGELOG.md
@@ -0,0 +1,40 @@
+# Changelog
+
+## 0.0.1 (proof of concept, not released yet)
+
+The first public version: an offline vector map for Tactility, tested on the LilyGO T-Deck.
+
+**Map**
+- Fullscreen map drawn by the app with LVGL stopped. LVGL comes back on every exit.
+- OpenFreeMap vector tiles (OpenMapTiles schema) from the SD card: water, land cover and use, parks, buildings,
+ waterways, roads with casings, railways, boundaries and airports, anti-aliased.
+- Zoom 0-19. Levels above 14 are drawn from the z14 vectors, so they stay sharp.
+- Pan and zoom by keys (W A S D, I / O), trackball, drag, pinch, double tap and the + / − buttons.
+- Your position from Tactility's location service, with an accuracy circle, a direction arrow while moving and
+ follow mode (G or ⌖). The app never changes location settings.
+- Scale bar, and the attribution: shown in full for 5 s, then a © mark that opens it again and leads to
+ About and licences.
+- Hidden controls (☰, + / −, ⌖) that show with a tap, Space or a click, with key hints on keyboards and a
+ pointer for the trackball in mouse mode.
+- Opens at ESA ESTEC the first time, then where you left it.
+
+**Downloads**
+- Download area: a fixed frame in the middle, the map moves and zooms under it. A live tile count, size estimate
+ and the highest zoom that fits OpenFreeMap's 3,000-tile / 50 MB limit.
+- The downloader uses OpenFreeMap's TileJSON, 2 keep-alive HTTPS connections and its own User-Agent. Tiles are
+ written as `.tmp` and renamed. Downloads resume after a restart, areas share tiles, and the download stops at
+ 50 MB of real data.
+- Download while browsing: with Wi-Fi, tiles on screen that have no detail yet are fetched one at a time and kept
+ in the region "browsed".
+- Regions screen: size, date and status, with delete (tiles other regions use are kept).
+
+**Speed**
+- Prepared tiles (`.prt`) next to each `.pbf`: only what the style draws, quantised to 2048 units per tile,
+ deflated. About a fifth of the size, half the render time. Converted in idle time.
+- One I/O task for all SD card access, tiles on screen first. Two render lanes, a PSRAM cache of 32 rendered
+ tiles, and prefetch only after a second without input.
+- Cold first z14 screen in dense central Budapest: 1.8-2.0 s on the T-Deck (5.6 s in the first device build).
+
+**Known limits**
+- At most 3,000 tiles or 50 MB per download. No labels yet. Touch tested on the T-Deck only. No automatic
+ region updates yet.
diff --git a/Apps/Maps/CMakeLists.txt b/Apps/Maps/CMakeLists.txt
new file mode 100644
index 0000000..48e3904
--- /dev/null
+++ b/Apps/Maps/CMakeLists.txt
@@ -0,0 +1,13 @@
+# tactility-cmakelists-version: 1
+cmake_minimum_required(VERSION 3.20)
+
+if (NOT DEFINED ENV{TACTILITY_SDK_PATH})
+ message(FATAL_ERROR "TACTILITY_SDK_PATH environment variable is not set")
+endif()
+
+get_filename_component(TACTILITY_SDK_PATH "$ENV{TACTILITY_SDK_PATH}" ABSOLUTE)
+include("${TACTILITY_SDK_PATH}/TactilitySDK.cmake")
+
+tactility_project_pre(maps)
+project(maps)
+tactility_project_post(maps)
diff --git a/Apps/Maps/LICENSE b/Apps/Maps/LICENSE
new file mode 100644
index 0000000..94a9ed0
--- /dev/null
+++ b/Apps/Maps/LICENSE
@@ -0,0 +1,674 @@
+ GNU GENERAL PUBLIC LICENSE
+ Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc.
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+ Preamble
+
+ The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+ The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works. By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users. We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors. You can apply it to
+your programs, too.
+
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+.
diff --git a/Apps/Maps/README.md b/Apps/Maps/README.md
new file mode 100644
index 0000000..74862a6
--- /dev/null
+++ b/Apps/Maps/README.md
@@ -0,0 +1,167 @@
+# Tactility Maps
+
+Offline vector maps for [Tactility](https://github.com/TactilityProject/Tactility) devices. The device
+downloads an area from [OpenFreeMap](https://openfreemap.org/) by itself and draws it fullscreen, with
+anti-aliased roads, water, parks and buildings, from tiles on the SD card.
+
+Version 0.0.1, a proof of concept, tested on a LilyGO T-Deck (ESP32-S3, 8 MB PSRAM). Changes are listed in
+[CHANGELOG.md](CHANGELOG.md).
+
+## Install
+
+Needs Tactility 0.8.0 or newer on an ESP32-S3 board with PSRAM, a FAT-formatted SD card, and Wi-Fi for
+downloading maps. Tested on Tactility 0.8.0-dev (main at 0e276da2) on a LilyGO T-Deck.
+
+1. Install "Maps" from Tactility's App Hub. Or copy the `.app` file to the SD card, open it in the Files app and
+ confirm "Install".
+2. Start "Maps" from the app list. The first time it opens at ESA ESTEC in Noordwijk with no map data yet: move
+ to your area, open the menu (M, long press or ☰) and choose Download area.
+
+| Map at z14 | Overzoom z16 | Following the position |
+|---|---|---|
+|  |  |  |
+
+| Download this area | Regions | About and licences |
+|---|---|---|
+|  |  |  |
+
+Screenshots taken on the T-Deck. Map data © OpenMapTiles © OpenStreetMap contributors.
+
+## How it works
+
+- Vector tiles (OpenMapTiles schema) are stored one file per tile in `maps////.pbf` on the SD card.
+- The map stops LVGL and draws with Tactility's `pixel_buffer` API, like the built-in Terminal app.
+- Tiles are inflated and decoded as a stream, never held whole in memory, and drawn with an exact-area
+ anti-aliasing rasteriser. Two render tasks (one per core) fill a PSRAM cache. Rendered tiles can also be
+ cached on the SD card (a setting, off by default).
+- Zoom levels above 14 are drawn from the z14 vectors, so they stay sharp.
+- Each downloaded tile also gets a prepared copy next to it (`.prt`): only what the style draws, with
+ quantised coordinates, grouped by draw order. It is about a fifth of the original's size and renders faster.
+ The original `.pbf` is never changed; it keeps names and house numbers for later features.
+- One task does all SD card reads and writes, tiles on screen first. Tiles around the screen are only
+ prepared after a second without input, and any input cancels them.
+- The position comes only from Tactility's location service. The app never changes location settings.
+- Menus, lists and dialogs are drawn by the app as well, LVGL stays stopped while the app runs.
+
+## Using the app
+
+**Map screen.** The map fills the screen. Always visible: your position (●, with an accuracy
+circle), the scale bar, and the © mark.
+
+| To… | Keyboard | Trackball | Touch |
+| --- | --- | --- | --- |
+| Move the map | W A S D | Roll | Drag |
+| Zoom in / out | I / O | — | Pinch, double tap to zoom in, or the + / − buttons |
+| Show / hide controls | Space | Click on empty map | Tap the map |
+| Centre on my position and follow | G | — | ⌖ button |
+| Stop following | Move the map | Roll | Drag |
+| Menu | M | Long click | ☰ button, or long press |
+| Download this area | Shift + D | — | Menu → Download area |
+| Credits | — | Click © | Tap ©, tap again for About and licences |
+| Leave the app | Esc or Backspace | Menu → Exit | Menu → Exit |
+
+**Controls.** Hidden by default. When shown: ☰ menu top left, + and − in the middle of the right edge, ⌖
+position bottom right above the scale bar. With a keyboard each button shows its key. ⌖ is filled while
+following, an outline when not, and crossed out when there is no position. With the trackball in mouse
+mode a pointer appears while the controls show; roll to a button and click it, click on empty map to hide
+them. On boards with buttons only (no keyboard, no touch), the buttons move the focus through the controls
+and press the focused one.
+
+**Menu:** Download area, Regions, Settings, About and licences, Exit. W/S, trackball or finger to
+move; Enter, click or tap to choose; Esc, Backspace or tap outside to close.
+
+**Downloading:** open Download area. The frame stays in the middle; move and zoom the map under
+it. The bar shows tiles, size and max zoom, and updates live. Enter, click or Download starts it;
+Esc cancels. It downloads in the background and resumes after a restart; areas share tiles.
+
+**Regions:** list with size, date and status (complete, downloading, outdated). Select with W/S,
+trackball or tap; delete with Del then confirm, or long press then Delete; Esc goes back.
+Deleting keeps tiles another region still uses.
+
+**Browsing:** with Wi-Fi, tiles on screen that have no detail on the card yet are downloaded while you
+look at them (a small "Downloading map" label shows) and kept in the region "browsed", so they work
+offline later. Without Wi-Fi a short message says that detail is missing here. Only the tiles on screen
+are fetched, one at a time.
+
+**Settings:** SD card cache on or off, prepared tiles deflated or raw, smooth pinch on or off, download
+while browsing on or off. Defaults: SD card cache off (switched off, its files are deleted in idle time),
+deflated, on, on. The map opens at ESA ESTEC, Noordwijk, the first time, then where you left it.
+
+**Updates:** after about 30 s without input, outdated regions update quietly and a small
+"Updating 42%" label shows. Any input pauses it. Only on Wi-Fi, and only when charging or above
+a battery level. *(Planned for M4, not in this version yet.)*
+
+**Position:** comes from Tactility's location service (GPS or approximate). If it's off, the ⌖
+button is crossed out and pressing it says how to enable it in Tactility's settings.
+
+## OpenFreeMap's rules
+
+OpenFreeMap is free and needs no key. Its [terms of service](https://openfreemap.org/tos/) for offline downloads
+are enforced in the app:
+at most 3,000 tiles and 50 MB per download (the highest zoom level that fits is chosen, the download also
+stops at 50 MB of real data), at most 4 parallel requests (the app uses 2), and a User-Agent that names the
+app. The tile URL is read from OpenFreeMap's TileJSON. openstreetmap.org tile servers are never used.
+
+## Known limits
+
+- One download is at most 3,000 tiles or 50 MB (OpenFreeMap's terms). In dense cities that is only a few hundred
+ z14 tiles, for example the centre of Budapest. Larger areas need several separate downloads, which you start
+ yourself.
+- No labels yet: no street, place or house names on the map.
+- Touch, keyboard and trackball were tested on the LilyGO T-Deck only. Other boards, boards without PSRAM and
+ monochrome or e-paper displays are untested.
+- Regions don't update themselves yet (planned for M4). Delete a region and download it again for newer data.
+- Monochrome (1-bit) displays: the map style loses most areas after Tactility's 1-bit conversion (planned for M4).
+- The trackball in mouse mode is only lightly tested.
+
+## Credits
+
+- Map data: [OpenStreetMap](https://www.openstreetmap.org/copyright) contributors, available under the Open
+ Database License (ODbL).
+- Vector tile schema: [OpenMapTiles](https://openmaptiles.org/).
+- Tiles served free of charge by [OpenFreeMap](https://openfreemap.org/), see its
+ [terms](https://openfreemap.org/tos/).
+- Built for [Tactility](https://github.com/TactilityProject/Tactility).
+
+## Attribution
+
+The full "© OpenMapTiles © OpenStreetMap contributors" shows for 5 seconds when the map opens and then
+collapses to a small "©" mark in the bottom left corner. Tapping or clicking it shows the text again for 5
+seconds, tapping the text opens "About and licences", which is also in the menu. This follows the OSMF
+attribution guidelines for small screens.
+
+## Building
+
+Needs ESP-IDF 6.1 and the Tactility SDK matching the firmware on the device.
+
+```
+python /tt.py app build
+python /tt.py app install --host
+python /tt.py app run --host
+```
+
+The PC build (`host/`, CMake) renders tiles to PNG and runs the unit tests:
+
+```
+cmake -S host -B host/build
+cmake --build host/build --config Release
+host/build/Release/render_tile 47.4979 19.0402 14 640 480 out.png
+host/build/Release/tests
+host/build/Release/prepare_tiles [--write] [--deflate] [--zoom 16]
+host/build/Release/ui_preview