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recept.cpp
recept.cpp

Repository files navigation

ReCept: Remarkable Intercept

A small library to intercept and smooth pen events on the reMarkable 2 tablet. This fixes the infamous "jagged lines" issue some users of the reMarkable 2 experience.

before vs after

Disclaimer

This is not an official reMarkable product, and I am in no way affiliated with reMarkable. I release this library in the hope that it is helpful to others. I can make no guarantee that it works as intended. There might be bugs leading to device crashes.

Installation

You need access to a Linux machine to install the fix. On that machine:

  1. Connect your reMarkable 2 with the USB-C cable.
  2. Clone this repository, i.e., run git clone https://github.com/funkey/recept in a terminal.
  3. Change into the repository with cd recept.
  4. Run ./install.sh.

The install script will make several ssh connections to your device. For that, it needs to know the IP address or hostname of your device. If you haven't set up public key authentication before, it will also ask for a password. You can find both the IP address and password in "Settings" -> "Help" -> "Copyrights and licenses", at the bottom.

If you want to uninstall the fix, simply enter 0 when asked for the smoothing value in the install script.

Will it increase the latency?

In short, yes. The pen events themselves are not delayed (the filter itself consists only of a handful of integer operations, which are likely negligible). However, since we forward the average position of the past N events instead of the actual event, the reported position is somewhere close to the N/2-last event received. How much that actually increases latency depends on how fast events come in. As an example, if the pen sends 1000 events per second and the filter size N is 8, the mean will trail the actual pen position by around 4 milliseconds. This calculation assumes isochronous events, which might not be the case.

How does it work?

ReCept uses the LD_PRELOAD trick, which in this case intercepts calls to open and read. Whenever /dev/input/event1 is opened by xochitl (the GUI running on the tablet), librecept remembers the file handle. Subsequent reads from this handle are transparently filtered with a moving average of size 16 by default.

About

Pen event interception for line smoothing on the reMarkable 2 tablet

Resources

Readme
MIT license
Activity

Stars

172 stars

Watchers

18 watching

Forks

14 forks
Report repository

Releases

Packages

Contributors

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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Repository files navigation
ReCept: Remarkable Intercept
A small library to intercept and smooth pen events on the reMarkable
2 tablet. This fixes the infamous "jagged lines"
issue some users of the reMarkable 2 experience.
before vs after
Disclaimer
This is not an official reMarkable product, and I am in no way affiliated with
reMarkable. I release this library in the hope that it is helpful to others. I
can make no guarantee that it works as intended. There might be bugs leading to
device crashes.
Installation
You need access to a Linux machine to install the fix. On that machine:
  1. Connect your reMarkable 2 with the USB-C cable.
  2. Clone this repository, i.e., run git clone https://github.com/funkey/recept in a terminal.
  3. Change into the repository with cd recept.
  4. Run ./install.sh.
The install script will make several ssh connections to your device. For
that, it needs to know the IP address or hostname of your device. If you
haven't set up public key authentication before, it will also ask for a
password. You can find both the IP address and password in "Settings" -> "Help"
-> "Copyrights and licenses", at the bottom.
If you want to uninstall the fix, simply enter 0 when asked for the smoothing
value in the install script.
Will it increase the latency?
In short, yes. The pen events themselves are not delayed (the filter itself
consists only of a handful of integer operations, which are likely negligible).
However, since we forward the average position of the past N events instead
of the actual event, the reported position is somewhere close to the N/2-last
event received. How much that actually increases latency depends on how fast
events come in. As an example, if the pen sends 1000 events per second and the
filter size N is 8, the mean will trail the actual pen position by around 4
milliseconds. This calculation assumes isochronous events, which might not be
the case.
How does it work?
ReCept uses the LD_PRELOAD trick, which in this case intercepts calls to
open and read. Whenever /dev/input/event1 is opened by xochitl (the GUI
running on the tablet), librecept remembers the file handle. Subsequent
reads from this handle are transparently filtered with a moving average of
size 16 by default.
About
Pen event interception for line smoothing on the reMarkable 2 tablet
Resources
Readme
MIT license
Activity
Stars
172 stars
Watchers
18 watching
Forks
14 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Repository files navigation
ReCept: Remarkable Intercept
A small library to intercept and smooth pen events on the reMarkable
2 tablet. This fixes the infamous "jagged lines"
issue some users of the reMarkable 2 experience.
before vs after
Disclaimer
This is not an official reMarkable product, and I am in no way affiliated with
reMarkable. I release this library in the hope that it is helpful to others. I
can make no guarantee that it works as intended. There might be bugs leading to
device crashes.
Installation
You need access to a Linux machine to install the fix. On that machine:
  1. Connect your reMarkable 2 with the USB-C cable.
  2. Clone this repository, i.e., run git clone https://github.com/funkey/recept in a terminal.
  3. Change into the repository with cd recept.
  4. Run ./install.sh.
The install script will make several ssh connections to your device. For
that, it needs to know the IP address or hostname of your device. If you
haven't set up public key authentication before, it will also ask for a
password. You can find both the IP address and password in "Settings" -> "Help"
-> "Copyrights and licenses", at the bottom.
If you want to uninstall the fix, simply enter 0 when asked for the smoothing
value in the install script.
Will it increase the latency?
In short, yes. The pen events themselves are not delayed (the filter itself
consists only of a handful of integer operations, which are likely negligible).
However, since we forward the average position of the past N events instead
of the actual event, the reported position is somewhere close to the N/2-last
event received. How much that actually increases latency depends on how fast
events come in. As an example, if the pen sends 1000 events per second and the
filter size N is 8, the mean will trail the actual pen position by around 4
milliseconds. This calculation assumes isochronous events, which might not be
the case.
How does it work?
ReCept uses the LD_PRELOAD trick, which in this case intercepts calls to
open and read. Whenever /dev/input/event1 is opened by xochitl (the GUI
running on the tablet), librecept remembers the file handle. Subsequent
reads from this handle are transparently filtered with a moving average of
size 16 by default.
About
Pen event interception for line smoothing on the reMarkable 2 tablet
Resources
Readme
MIT license
Activity
Stars
172 stars
Watchers
18 watching
Forks
14 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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install.sh
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recept.cpp
recept.cpp
Repository files navigation
ReCept: Remarkable Intercept
A small library to intercept and smooth pen events on the reMarkable
2 tablet. This fixes the infamous "jagged lines"
issue some users of the reMarkable 2 experience.
before vs after
Disclaimer
This is not an official reMarkable product, and I am in no way affiliated with
reMarkable. I release this library in the hope that it is helpful to others. I
can make no guarantee that it works as intended. There might be bugs leading to
device crashes.
Installation
You need access to a Linux machine to install the fix. On that machine:
  1. Connect your reMarkable 2 with the USB-C cable.
  2. Clone this repository, i.e., run git clone https://github.com/funkey/recept in a terminal.
  3. Change into the repository with cd recept.
  4. Run ./install.sh.
The install script will make several ssh connections to your device. For
that, it needs to know the IP address or hostname of your device. If you
haven't set up public key authentication before, it will also ask for a
password. You can find both the IP address and password in "Settings" -> "Help"
-> "Copyrights and licenses", at the bottom.
If you want to uninstall the fix, simply enter 0 when asked for the smoothing
value in the install script.
Will it increase the latency?
In short, yes. The pen events themselves are not delayed (the filter itself
consists only of a handful of integer operations, which are likely negligible).
However, since we forward the average position of the past N events instead
of the actual event, the reported position is somewhere close to the N/2-last
event received. How much that actually increases latency depends on how fast
events come in. As an example, if the pen sends 1000 events per second and the
filter size N is 8, the mean will trail the actual pen position by around 4
milliseconds. This calculation assumes isochronous events, which might not be
the case.
How does it work?
ReCept uses the LD_PRELOAD trick, which in this case intercepts calls to
open and read. Whenever /dev/input/event1 is opened by xochitl (the GUI
running on the tablet), librecept remembers the file handle. Subsequent
reads from this handle are transparently filtered with a moving average of
size 16 by default.
About
Pen event interception for line smoothing on the reMarkable 2 tablet
Resources
Readme
MIT license
Activity
Stars
172 stars
Watchers
18 watching
Forks
14 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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recept.cpp
Repository files navigation
ReCept: Remarkable Intercept
A small library to intercept and smooth pen events on the reMarkable
2 tablet. This fixes the infamous "jagged lines"
issue some users of the reMarkable 2 experience.
before vs after
Disclaimer
This is not an official reMarkable product, and I am in no way affiliated with
reMarkable. I release this library in the hope that it is helpful to others. I
can make no guarantee that it works as intended. There might be bugs leading to
device crashes.
Installation
You need access to a Linux machine to install the fix. On that machine:
  1. Connect your reMarkable 2 with the USB-C cable.
  2. Clone this repository, i.e., run git clone https://github.com/funkey/recept in a terminal.
  3. Change into the repository with cd recept.
  4. Run ./install.sh.
The install script will make several ssh connections to your device. For
that, it needs to know the IP address or hostname of your device. If you
haven't set up public key authentication before, it will also ask for a
password. You can find both the IP address and password in "Settings" -> "Help"
-> "Copyrights and licenses", at the bottom.
If you want to uninstall the fix, simply enter 0 when asked for the smoothing
value in the install script.
Will it increase the latency?
In short, yes. The pen events themselves are not delayed (the filter itself
consists only of a handful of integer operations, which are likely negligible).
However, since we forward the average position of the past N events instead
of the actual event, the reported position is somewhere close to the N/2-last
event received. How much that actually increases latency depends on how fast
events come in. As an example, if the pen sends 1000 events per second and the
filter size N is 8, the mean will trail the actual pen position by around 4
milliseconds. This calculation assumes isochronous events, which might not be
the case.
How does it work?
ReCept uses the LD_PRELOAD trick, which in this case intercepts calls to
open and read. Whenever /dev/input/event1 is opened by xochitl (the GUI
running on the tablet), librecept remembers the file handle. Subsequent
reads from this handle are transparently filtered with a moving average of
size 16 by default.
About
Pen event interception for line smoothing on the reMarkable 2 tablet
Resources
Readme
MIT license
Activity
Stars
172 stars
Watchers
18 watching
Forks
14 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Repository files navigation
ReCept: Remarkable Intercept
A small library to intercept and smooth pen events on the reMarkable
2 tablet. This fixes the infamous "jagged lines"
issue some users of the reMarkable 2 experience.
before vs after
Disclaimer
This is not an official reMarkable product, and I am in no way affiliated with
reMarkable. I release this library in the hope that it is helpful to others. I
can make no guarantee that it works as intended. There might be bugs leading to
device crashes.
Installation
You need access to a Linux machine to install the fix. On that machine:
  1. Connect your reMarkable 2 with the USB-C cable.
  2. Clone this repository, i.e., run git clone https://github.com/funkey/recept in a terminal.
  3. Change into the repository with cd recept.
  4. Run ./install.sh.
The install script will make several ssh connections to your device. For
that, it needs to know the IP address or hostname of your device. If you
haven't set up public key authentication before, it will also ask for a
password. You can find both the IP address and password in "Settings" -> "Help"
-> "Copyrights and licenses", at the bottom.
If you want to uninstall the fix, simply enter 0 when asked for the smoothing
value in the install script.
Will it increase the latency?
In short, yes. The pen events themselves are not delayed (the filter itself
consists only of a handful of integer operations, which are likely negligible).
However, since we forward the average position of the past N events instead
of the actual event, the reported position is somewhere close to the N/2-last
event received. How much that actually increases latency depends on how fast
events come in. As an example, if the pen sends 1000 events per second and the
filter size N is 8, the mean will trail the actual pen position by around 4
milliseconds. This calculation assumes isochronous events, which might not be
the case.
How does it work?
ReCept uses the LD_PRELOAD trick, which in this case intercepts calls to
open and read. Whenever /dev/input/event1 is opened by xochitl (the GUI
running on the tablet), librecept remembers the file handle. Subsequent
reads from this handle are transparently filtered with a moving average of
size 16 by default.
About
Pen event interception for line smoothing on the reMarkable 2 tablet
Resources
Readme
MIT license
Activity
Stars
172 stars
Watchers
18 watching
Forks
14 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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README.md
install.sh
install.sh
recept.cpp
recept.cpp
Repository files navigation
ReCept: Remarkable Intercept
A small library to intercept and smooth pen events on the reMarkable
2 tablet. This fixes the infamous "jagged lines"
issue some users of the reMarkable 2 experience.
before vs after
Disclaimer
This is not an official reMarkable product, and I am in no way affiliated with
reMarkable. I release this library in the hope that it is helpful to others. I
can make no guarantee that it works as intended. There might be bugs leading to
device crashes.
Installation
You need access to a Linux machine to install the fix. On that machine:
  1. Connect your reMarkable 2 with the USB-C cable.
  2. Clone this repository, i.e., run git clone https://github.com/funkey/recept in a terminal.
  3. Change into the repository with cd recept.
  4. Run ./install.sh.
The install script will make several ssh connections to your device. For
that, it needs to know the IP address or hostname of your device. If you
haven't set up public key authentication before, it will also ask for a
password. You can find both the IP address and password in "Settings" -> "Help"
-> "Copyrights and licenses", at the bottom.
If you want to uninstall the fix, simply enter 0 when asked for the smoothing
value in the install script.
Will it increase the latency?
In short, yes. The pen events themselves are not delayed (the filter itself
consists only of a handful of integer operations, which are likely negligible).
However, since we forward the average position of the past N events instead
of the actual event, the reported position is somewhere close to the N/2-last
event received. How much that actually increases latency depends on how fast
events come in. As an example, if the pen sends 1000 events per second and the
filter size N is 8, the mean will trail the actual pen position by around 4
milliseconds. This calculation assumes isochronous events, which might not be
the case.
How does it work?
ReCept uses the LD_PRELOAD trick, which in this case intercepts calls to
open and read. Whenever /dev/input/event1 is opened by xochitl (the GUI
running on the tablet), librecept remembers the file handle. Subsequent
reads from this handle are transparently filtered with a moving average of
size 16 by default.
About
Pen event interception for line smoothing on the reMarkable 2 tablet
Resources
Readme
MIT license
Activity
Stars
172 stars
Watchers
18 watching
Forks
14 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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ReCept: Remarkable Intercept
A small library to intercept and smooth pen events on the reMarkable
2 tablet. This fixes the infamous "jagged lines"
issue some users of the reMarkable 2 experience.
before vs after
Disclaimer
This is not an official reMarkable product, and I am in no way affiliated with
reMarkable. I release this library in the hope that it is helpful to others. I
can make no guarantee that it works as intended. There might be bugs leading to
device crashes.
Installation
You need access to a Linux machine to install the fix. On that machine:
  1. Connect your reMarkable 2 with the USB-C cable.
  2. Clone this repository, i.e., run git clone https://github.com/funkey/recept in a terminal.
  3. Change into the repository with cd recept.
  4. Run ./install.sh.
The install script will make several ssh connections to your device. For
that, it needs to know the IP address or hostname of your device. If you
haven't set up public key authentication before, it will also ask for a
password. You can find both the IP address and password in "Settings" -> "Help"
-> "Copyrights and licenses", at the bottom.
If you want to uninstall the fix, simply enter 0 when asked for the smoothing
value in the install script.
Will it increase the latency?
In short, yes. The pen events themselves are not delayed (the filter itself
consists only of a handful of integer operations, which are likely negligible).
However, since we forward the average position of the past N events instead
of the actual event, the reported position is somewhere close to the N/2-last
event received. How much that actually increases latency depends on how fast
events come in. As an example, if the pen sends 1000 events per second and the
filter size N is 8, the mean will trail the actual pen position by around 4
milliseconds. This calculation assumes isochronous events, which might not be
the case.
How does it work?
ReCept uses the LD_PRELOAD trick, which in this case intercepts calls to
open and read. Whenever /dev/input/event1 is opened by xochitl (the GUI
running on the tablet), librecept remembers the file handle. Subsequent
reads from this handle are transparently filtered with a moving average of
size 16 by default.
About
Pen event interception for line smoothing on the reMarkable 2 tablet
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