## Summary
* **What is the goal of this PR?** Potential stack buffer overflow from
untrusted ZIP entry name length
* **What changes are included?** If nameLen >= 256 , this writes past
the stack buffer. Risk: memory corruption/crash on malformed EPUB/ZIP.
## Additional Context
* Add any other information that might be helpful for the reviewer
(e.g., performance implications, potential risks,
specific areas to focus on).
---
### AI Usage
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Did you use AI tools to help write this code? _** PARTIALLY **_ Issue
identified by AI
Description
This Pull Request introduces Turkish language support to CrossPoint
Reader firmware.
Key Changes:
- Translation File: Added lib/I18n/translations/turkish.yaml with 315
translated
string keys, covering all system UI elements.
- I18N Script Update: Modified scripts/gen_i18n.py to include the "TR"
abbreviation mapping for Turkish.
- System Integration: Regenerated I18N C++ files to include the new
Language::TR
enum and STRINGS_TR array.
- UI Availability: The language is now selectable in the Settings menu
and
correctly handles Turkish-specific characters (ç, ğ, ı, ö, ş, ü).
- Documentation: Updated docs/i18n.md to include Turkish in the list of
supported languages.
Testing:
- Verified the build locally with PlatformIO.
- Flashed the firmware to an Xteink X4 device and confirmed the Turkish
UI
renders correctly.
---
### AI Usage
Did you use AI tools to help write this code? Yes Gemini
---------
Co-authored-by: Baris Albayrak <baris@Bariss-MacBook-Pro.local>
Co-authored-by: Barış Albayrak <barisa@pop-os.lan>
## Summary
* **What is the goal of this PR?**
* Improve and add the latest missing Swedish translations.
* **What changes are included?**
* Added missing Swedish translations in
`lib\I18n\translations\swedish.yaml`
## Additional Context
* (none)
---
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## Summary
* **What is the goal of this PR?** (e.g., Implements the new feature for
file uploading.)
added Romanian ranslations from recent commits.
---
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please be transparent about their usage as it
helps set the right context for reviewers.
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## Summary
**What is the goal of this PR?**
This change avoids the pattern of creating a `std::string` using
`.substr` in order to compare against a file extension literal.
```c++
std::string path;
if (path.length() >= 4 && path.substr(path.length() - 4) == ".ext")
```
The `checkFileExtension` utility has moved from StringUtils to
FsHelpers, to be available to code in lib/. The signature now accepts a
`std::string_view` instead of `std::string`, which makes the single
implementation reusable for Arduino `String`.
Added utility functions for commonly repeated extensions.
These changes **save about 2 KB of flash (5,999,427 to 5,997,343)**.
---
### AI Usage
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## Summary
**What is the goal of this PR?**
Quick follow up to #1291, adding Polish translations suggested by
@th0m4sek
---
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## Summary
* **What is the goal of this PR?**
Update relative paths to correctly navigate from .skills/ directory to
project root by adding ../ prefix to file references.
* **What changes are included?**
.skills/SKILL.md
---
### AI Usage
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## Summary
* **What is the goal of this PR?**
Add missing Catalan strings.
* **What changes are included?**
Changes on catalan.yaml file only.
### AI Usage
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please be transparent about their usage as it
helps set the right context for reviewers.
Did you use AI tools to help write this code? PARTIALLY
## Summary
**What is the goal of this PR?**
Avoid building cache path strings twice, once to check existence of the
file and a second time to delete the file.
---
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please be transparent about their usage as it
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Did you use AI tools to help write this code? _**NO**_
## Summary
* **What is the goal of this PR?** Extend missing / amend existing
German translations
* **What changes are included?** German.yaml
## Additional Context
---
---
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Co-authored-by: Arthur Tazhitdinov <lisnake@gmail.com>
## Summary
**What is the goal of this PR?** Add a user setting to decide image
support: display, show placeholder instead, supress fully
Fixes#1289
---
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## Summary
**Goal of this PR**
Add an **"In-scope — technically not supported"** section to `SCOPE.md`.
This clarifies hardware/UX limitations (e.g., clock support) and is
intended to reduce recurring feature requests on topics already
discussed.
Based on discussions in #287 and #626.
---
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## Summary
* Enable `DESTRUCTOR_CLOSES_FILE` flag
* We're never intending to not close files, so if we accidentally leave
them open as they're destructured, this will help close them.
## Additional Context
* As spotted in
https://github.com/crosspoint-reader/crosspoint-reader/pull/869, there
are cases where we were accidentally not closing files
Looks to use about 5K of flash.
```
RAM: [=== ] 31.5% (used 103100 bytes from 327680 bytes)
Flash: [======= ] 68.9% (used 4513220 bytes from 6553600 bytes)
```
```
RAM: [=== ] 31.5% (used 103100 bytes from 327680 bytes)
Flash: [======= ] 68.9% (used 4518498 bytes from 6553600 bytes)
```
---
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## Summary
* **What changes are included?**
New Ukrainian localization strings
## Additional Context
auto turn functionality
https://github.com/crosspoint-reader/crosspoint-reader/pull/1219
---
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## Summary
Ref discussion:
https://github.com/crosspoint-reader/crosspoint-reader/pull/1222#discussion_r2865402110
Important note that this is a bug-for-bug fix. In reality, this branch
`WiFi.status() == WL_CONNECTED` is pretty much a dead code because the
entry point of these 2 activities don't use wifi.
It is better to refactor the management of network though, but it's
better to be a dedicated PR.
---
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Did you use AI tools to help write this code? **NO**
## Summary
* **What is the goal of this PR?**
- Improve and add the latest missing Spanish translations
* **What changes are included?**
- Add missing spaces and remove extra unneeded ones (spaces at the end
of certain strings and others, i.e. the one introduced in the string
`Smart Device`; actually, `SmartDevice` is the correct Calibre plugin
name)
- Normalise the use of caps in certain strings
- Adapting the translation to the one found in related third-party
software (i.e. Spanish translation for the word `plugin` in Calibre is
`complemento`)
- Shortening some translations to make them smaller and fit better in
screen
- Rewording ambiguous translations (i.e. `Volver a inicio` could mean to
go back to Home, but also to go back to the first page of the current
book, so I changed it for a more specific action, `Volver al menú
Inicio`)
## Additional Context
* **Missing spaces caused a lack of clarity**
- My main motivation for this PR was the following:
<details>
<summary>Screenshots:</summary>
In English:
In Spanish:
</details>
---
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Did you use AI tools to help write this code? _**NO**_
---------
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
## Summary
* Custom sleep screen images now load from /.sleep directory
(preferred), falling back to /sleep for backwards compatibility. The
dot-prefix keeps the directory hidden from the file browser.
* Rewrote User Guide section 3.6 to document all six sleep screen modes,
cover settings, and the updated custom image setup.
## Additional Context
* The sleep directoy entry while browsing files was distracting.
---
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Did you use AI tools to help write this code? _NO_
## Summary
* **What is the goal of this PR?** Fixing two independent CSS rendering
bugs combined to make hanging-indent list styles
(e.g. margin-left:3em; text-indent:-1em) render incorrectly:
* **What changes are included?**
1. Negative text-indent was silently ignored
Three guards in ParsedText.cpp (computeLineBreaks,
computeHyphenatedLineBreaks,
extractLine) conditioned firstLineIndent on blockStyle.textIndent > 0,
so any
negative value collapsed to zero. Additionally, wordXpos was uint16_t,
which
cannot represent negative offsets — a cast of e.g. −18 would wrap to
65518 and
render the word far off-screen.
2. extraParagraphSpacing suppressed hanging indents
Even after removing the > 0 guard, the existing !extraParagraphSpacing
condition
would still suppress all text-indent when that setting is on (its
default). Positive
text-indent is a decorative paragraph indent that the user can
reasonably replace with
vertical spacing — negative text-indent is structural (it positions the
list marker)
and must always apply.
3. em unit was calibrated against line height, not font size
emSize was computed as getLineHeight() * lineCompression (the full line
advance).
CSS em units are defined relative to the font-size, which corresponds to
the
ascender height — not the line height. Using line height makes every
em-based
margin/indent ~20–30% wider than a browser would render it, and is
especially
noticeable for CSS that uses font-size: small (which we do not
implement).
## Additional Context
Test case
```
.lsl1 { margin-left: 3em; text-indent: -1em; }
<div class="lsl1">• First list item that wraps across lines</div>
<div class="lsl1">• Short item</div>
```
Before: all lines of all items started at 3 em from the left edge
(indent ignored).
After: the bullet marker hangs at 2 em; continuation lines align at 3
em.
<img width="240" alt="before"
src="https://github.com/user-attachments/assets/9dcbf3e0-fcd9-4af8-b451-a90ba4d2fb75"
/>
<img width="240" alt="after"
src="https://github.com/user-attachments/assets/1ffdcf56-a180-4267-9590-c60d7ac44707"
/>
---
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## Summary
* Renames MyLibrary component to FileBrowser, as it better reflects what
it is, in my opinion
## Additional Context
* Frees the Library name for possible future library component that can
cache metadata, provide other ways of browsing than filesystem
structure, etc
---
### AI Usage
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## Summary
**What is the goal of this PR?**
Hopefully fixes#1182.
_Note: I think letterforms got a "heavier" appearance after #1098, which
makes this more noticeable. The current version of this PR reverts the
change to add `--force-autohint` for Bookerly, which to me seems to
bring the font back to a more aesthetic and consistent weight._
#### Problem
Character spacing was uneven in certain words. The word "drew" in
Bookerly was the clearest example: a visible gap between `d` and `r`,
while `e` and `w` appeared tightly condensed. The root cause was
twofold:
1. **Integer-only glyph advances.** `advanceX` was stored as a `uint8_t`
of whole pixels, sourced from FreeType's hinted `advance.x` (which
grid-fits to integers). A glyph whose true advance is 15.56px was stored
as 16px -- an error of +0.44px per character that compounds across a
line.
2. **Floor-rounded kerning.** Kern adjustments were converted with
`math.floor()`, which systematically over-tightened negative kerns. A
kern of -0.3px became -1px -- a 0.7px over-correction that visibly
closed gaps.
Combined, these produced the classic symptom: some pairs too wide,
others too tight, with the imbalance varying per word.
#### Solution: fixed-point accumulation with 1/16-pixel resolution, for
sub-pixel precision during text layout
All font metrics now use a "fixed-point 4" format -- 4 fractional bits
giving 1/16-pixel (0.0625px) resolution. This is implemented with plain
integer arithmetic (shifts and adds), requiring no floating-point on the
ESP32.
**How it works:**
A value like 15.56px is stored as the integer `249`:
```
249 = 15 * 16 + 9 (where 9/16 = 0.5625, closest to 0.56)
```
Two storage widths share the same 4 fractional bits:
| Field | Type | Format | Range | Use |
|-------|------|--------|-------|-----|
| `advanceX` | `uint16_t` | 12.4 | 0 -- 4095.9375 px | Glyph advance
width |
| `kernMatrix` | `int8_t` | 4.4 | -8.0 -- +7.9375 px | Kerning
adjustment |
Because both have 4 fractional bits, they add directly into a single
`int32_t` accumulator during layout. The accumulator is only snapped to
the nearest whole pixel at the moment each glyph is rendered:
```cpp
int32_t xFP = fp4::fromPixel(startX); // pixel to 12.4: startX << 4
for each character:
xFP += kernFP; // add 4.4 kern (sign-extends into int32_t)
int xPx = fp4::toPixel(xFP); // snap to nearest pixel: (xFP + 8) >> 4
render glyph at xPx;
xFP += glyph->advanceX; // add 12.4 advance
```
Fractional remainders carry forward indefinitely. Rounding errors stay
below +/- 0.5px and never compound.
#### Concrete example: "drew" in Bookerly
**Before** (integer advances, floor-rounded kerning):
| Char | Advance | Kern | Cursor | Snap | Gap from prev |
|------|---------|------|--------|------|---------------|
| d | 16 px | -- | 33 | 33 | -- |
| r | 12 px | 0 | 49 | 49 | ~2px |
| e | 13 px | -1 | 60 | 60 | ~0px |
| w | 22 px | -1 | 72 | 72 | ~0px |
The d-to-r gap was visibly wider than the tightly packed `rew`.
**After** (12.4 advances, 4.4 kerning, fractional accumulation):
| Char | Advance (FP) | Kern (FP) | Accumulator | Snap | Ink start | Gap
from prev |
|------|-------------|-----------|-------------|------|-----------|---------------|
| d | 249 (15.56px) | -- | 528 | 33 | 34 | -- |
| r | 184 (11.50px) | 0 | 777 | 49 | 49 | 0px |
| e | 208 (13.00px) | -8 (-0.50px) | 953 | 60 | 61 | 1px |
| w | 356 (22.25px) | -4 (-0.25px) | 1157 | 72 | 72 | 0px |
Spacing is now `0, 1, 0` pixels -- nearly uniform. Verified on-device:
all 5 copies of "drew" in the test EPUB produce identical spacing,
confirming zero accumulator drift.
#### Changes
**Font conversion (`fontconvert.py`)**
- Use `linearHoriAdvance` (FreeType 16.16, unhinted) instead of
`advance.x` (26.6, grid-fitted to integers) for glyph advances
- Encode kern values as 4.4 fixed-point with `round()` instead of
`floor()`
- Add `fp4_from_ft16_16()` and `fp4_from_design_units()` helper
functions
- Add module-level documentation of fixed-point conventions
**Font data structures (`EpdFontData.h`)**
- `EpdGlyph::advanceX`: `uint8_t` to `uint16_t` (no memory cost due to
existing struct padding)
- Add `fp4` namespace with `constexpr` helpers: `fromPixel()`,
`toPixel()`, `toFloat()`
- Document fixed-point conventions
**Font API (`EpdFont.h/cpp`, `EpdFontFamily.h/cpp`)**
- `getKerning()` return type: `int8_t` to `int` (to avoid truncation of
the 4.4 value)
**Rendering (`GfxRenderer.cpp`)**
- `drawText()`: replace integer cursor with `int32_t` fixed-point
accumulator
- `drawTextRotated90CW()`: same accumulator treatment for vertical
layout
- `getTextAdvanceX()`, `getSpaceWidth()`, `getSpaceKernAdjust()`,
`getKerning()`: convert from fixed-point to pixel at API boundary
**Regenerated all built-in font headers** with new 12.4 advances and 4.4
kern values.
#### Memory impact
Zero additional RAM. The `advanceX` field grew from `uint8_t` to
`uint16_t`, but the `EpdGlyph` struct already had 1 byte of padding at
that position, so the struct size is unchanged. The fixed-point
accumulator is a single `int32_t` on the stack.
#### Test plan
- [ ] Verify "drew" spacing in Bookerly at small, medium, and large
sizes
- [ ] Verify uppercase kerning pairs: AVERY, WAVE, VALUE
- [ ] Verify ligature words: coffee, waffle, office
- [ ] Verify all built-in fonts render correctly at each size
- [ ] Verify rotated text (progress bar percentage) renders correctly
- [ ] Verify combining marks (accented characters) still position
correctly
- [ ] Spot-check a full-length book for any layout regressions
---
### AI Usage
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helps set the right context for reviewers.
Did you use AI tools to help write this code? _**YES, Claude Opus 4.6
helped figure out a non-floating point approach for sub-pixel error
accumulation**_
## Summary
**What is the goal of this PR?**
- Adds `scripts/firmware_size_history.py`, a developer tool that builds
firmware at selected git commits and reports flash usage with deltas
between them.
- Supports two input modes: `--range START END` to walk every commit in
a range, or `--commits REF [REF ...]` to compare specific refs (which
can span branches).
- Defaults to a human-readable aligned table; pass `--csv` for
machine-readable output to stdout or `--csv FILE` to write to a file.
---
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AI**_
## Summary
**What is the goal of this PR?**
Rewrite of font routines to use std binary search algorithms instead of
custom repeated implementations: `lookupKernClass`,
`EpdFont::getLigature`, and `EpdFont::getGlyph`.
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## Summary
**What is the goal of this PR?**
Small follow up to #909, removing an unused member variable and some
temporary debug logging.
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