Optimizelegibility not working

Ansl · 12-02-2022, 02:06 PM

(Not sure if I should post here or in dev subforum, sorry if I'm in the wrong place.) So, I just updated my device from 4.18 to the newest firmware out of curiosity and to get the Oxford dictionary hassle-free... but I had to give up my trusty text-rendering patch and instead move it to the config file, and I just can't. get it. to stick. To be clear, the right line is in there, in the correct section all right, and I am indeed looking at a kepub file - but no matter what typeface I choose, I can't see a single ligature in my book. What am I doing wrong?? Is there such a thing as a conflicting patch still? I tried editing the file with both Notepad++ and (in a moment of desperation) standard Windows Notepad, and I've power cycled the device...and my other config options are still displaying correctly. Am sad and almost want to go back to paper books for the weekend. Help :(

RobertJSawyer · 12-02-2022, 02:57 PM

As far as I can tell, optimize legibility only enables kerning; I know of no way to enable ligatures in kepub files.

Ansl · 12-02-2022, 04:22 PM

The old patch did, for typefaces that had old style kerning and ligatures enabled. I can't even tell if this setting enables one but not the other because it's such a jarring difference. But thank you for the answer, I'll experiment a little and revert back to the old fw if needed.

ZodWallop · 12-02-2022, 05:00 PM

Optimize legibility should enable ligatures. I use ligatures in my kepubs and have for years.

I have switched to geometric precision as it keeps the ligatures and works better with spacing issues.

Under [Reading], paste:
webkitTextRendering=geometricPrecision

And I just use Notepad in Windows 10.

Ansl · 12-02-2022, 06:17 PM

Quote:

Originally Posted by ZodWallop

Optimize legibility should enable ligatures. I use ligatures in my kepubs and have for years.

I have switched to geometric precision as it keeps the ligatures and works better with spacing issues.

Under [Reading], paste:
webkitTextRendering=geometricPrecision

And I just use Notepad in Windows 10.

Close but no cigar. Glad to know they're still accessible somehow, but alas, my letters stay stubbornly separate. I don't know what I'm doing wrong.

Aleron Ives · 12-02-2022, 06:30 PM

Aren't ligatures part of the font itself? Maybe you're using a font that doesn't support them, or at least for which WebKit can't enable them?

Ansl · 12-02-2022, 06:58 PM

Quote:

Originally Posted by Aleron Ives

Aren't ligatures part of the font itself? Maybe you're using a font that doesn't support them, or at least for which WebKit can't enable them?

Possible, of course. I could have done something to many of the side loaded ones trying to optimise them, too. But the stock iteration of Amasis has ligatures too and even they are not showing up.

ZodWallop · 12-02-2022, 08:37 PM

Quote:

Originally Posted by Ansl

Close but no cigar. Glad to know they're still accessible somehow, but alas, my letters stay stubbornly separate. I don't know what I'm doing wrong.

Maybe list the patches you currently have enabled.

And just to make sure, in your .kobo folder, Kobo eReader.conf [Reading} section looks something like this?

Code:

[Reading]
bookProgressType=2
chapterProgressType=3
newBookProgressType=6
pageTurningOption=option3
readingAdobeShowPageNumbers=false
readingAlignment=
readingFontFamily=Literata Book
readingFontSharpness\Georgia=-0.06
readingFontSize=42
readingFontWeight\Georgia=0.11
readingLeftMargin=0
readingLineHeight=1
readingMenuState=
readingRightMargin=0
showFooter=true
showProgressBar=true
showTitle=false
webkitTextRendering=geometricPrecision

Ansl · 12-03-2022, 08:38 AM

Patch log, sorry it's long, but I thought it would be more useful to be reminded of everything there is rather than just the things I have enabled, in case there really is a conflict somewhere.

Code:

Patching ./usr/local/Kobo/libnickel.so.1.0.0
  SKIP  `Allow USB storage even when device locked`
  APPLY `Allow rotation on all devices`
  SKIP  `Allow showing info panel on random screensaver`
  SKIP  `Always show confirmation dialog before upgrading`
  APPLY `Block WiFi firmware upgrade`
  SKIP  `Both page turn buttons go next`
  SKIP  `Both page turn sides go next`
  SKIP  `Bulgarian Phonetic Keyboard (GloHD/ClaraHD/AuraOne/H2O2/Forma/Libra)`
  SKIP  `Change Browse Kobo home screen link target - Activity`
  SKIP  `Change Wikipedia search language`
  SKIP  `Custom Sleep/Power-off timeouts`
  APPLY `Custom font sizes`
  SKIP  `Custom header/footer page number text`
  SKIP  `Custom kepub default margins`
  SKIP  `Custom left & right margins`
  APPLY `Custom navigation menu page number text`
  SKIP  `Customize ComfortLight settings`
  SKIP  `Cyrillic Keyboard (GloHD/ClaraHD/AuraOne/H2O2)`
  SKIP  `DeveloperSettings - AutoUsbGadget`
  SKIP  `Dictionary text font-family/font-size/line-height`
  SKIP  `Disable all tutorial dialogs`
  SKIP  `Don't grab exclusive access to event0`
  SKIP  `Don't uppercase header/footer text`
  APPLY `Don't uppercase header/footer text and change page number text`
  SKIP  `FeatureSettings - BookSpecificStats`
  SKIP  `FeatureSettings - ExportHighlights`
  SKIP  `FeatureSettings - FullScreenBrowser`
  SKIP  `FeatureSettings - MyWords`
  SKIP  `FeatureSettings - ShowFacebookShare`
  APPLY `Force user font-family in ePubs (Part 1 of 2)`
  APPLY `Force user line spacing in KePubs`
  APPLY `Force user line spacing in ePubs (part 1 of 2)`
  SKIP  `Greek Keyboard (GloHD/ClaraHD/AuraOne/H2O2)`
  SKIP  `Hide browser from beta features`
  SKIP  `Increase page navigation history`
  SKIP  `KePub stylesheet additions - text justify`
  SKIP  `KePub stylesheet additions - word-spacing`
  APPLY `Larger Sleep/Power-off timeouts`
  SKIP  `My 10 line spacing values`
  APPLY `My 24 line spacing values`
  SKIP  `Never show Kobo Plus, wishlist, and points SmartLinks`
  SKIP  `Only show Pocket SmartLink`
  SKIP  `Only show stats SmartLink`
  SKIP  `PowerSettings - UnlockEnabled`
  APPLY `Remove beta features not supported text`
  SKIP  `Remove line from bottom tab bar`
  APPLY `Remove recommendations (row1col2) from home screen`
  SKIP  `Remove title from reading header/footer`
  APPLY `Rename new home screen footer`
  APPLY `Replace adobe page numbers toggle with invert screen`
  APPLY `Set KePub hyphenation`
  SKIP  `Set visible SmartLink`
  SKIP  `Shorten dictionary entry not found message`
  SKIP  `Swap reading header/footer`
  APPLY `Un-Force user font-family in KePubs`
  SKIP  `Un-Force user text-align in div,p tags in KePubs`
  SKIP  `Un-force font-family override p tags (std epubs)`
  APPLY `Un-force link decoration in KePubs`
  APPLY `Unify font sizes`
  SKIP  `ePub constant font sharpness`
  SKIP  `ePub disable built-in body padding-bottom`
  SKIP  `ePub fixed top/bottom margins`

Patching ./usr/local/Kobo/nickel
  SKIP  `Change TOC level indentation`
  SKIP  `Custom collection/author header title font`
  APPLY `Custom header/footer captions`
  SKIP  `Custom page navigation scrubber`
  APPLY `Custom synopsis details line spacing`
  SKIP  `Custom synopsis font size`
  APPLY `Customise Header back button`
  SKIP  `Dictionary pop-up - increase available text area`
  SKIP  `Increase Book Details synopsis area`
  SKIP  `Increase headlines font`
  SKIP  `Increase home screen cover size`
  APPLY `Increase library cover size`
  SKIP  `Increase size of kepub chapter progress chart`
  SKIP  `New home screen subtitle custom font`
  SKIP  `Reduce new header/footer height`
  SKIP  `Reduce top/bottom page spacer`
  APPLY `Remove footer (row3) and increase cover size on new home screen`
  SKIP  `Remove footer (row3) on new home screen`
  SKIP  `Remove forgot pin button from lock screen`
  SKIP  `Series list increase cover thumbnails`
  APPLY `Show all games`

Patching ./usr/local/Kobo/libadobe.so
  SKIP  `Remove PDF map widget shown during panning`

Patching ./usr/local/Kobo/librmsdk.so.1.0.0
  SKIP  `Default ePub monospace font`
  APPLY `Default ePub sans-serif font (Gill Sans)`
  SKIP  `Default ePub serif font (Amasis)`
  SKIP  `Default ePub symbol font (Symbol)`
  APPLY `Disable orphans/widows avoidance`
  APPLY `Force user font-family in ePubs (Part 2 of 2)`
  APPLY `Force user line spacing in ePubs (Part 2 of 2)`
  SKIP  `Ignore ePub TOC navpoints`
  SKIP  `Ignore ePub book Adobe XPGT stylesheet (page-template.xpgt)`
  SKIP  `Ignore ePub book CSS and Adobe XPGT stylesheets`

and the relevant section of the config file

Code:

[Reading]
annotationsViewStyle=notebook
bookProgressType=2
fullScreenReading=true
numPartialUpdatePageTurns=1
pageTurnGesture=0
pageTurningOption=default
readingAdobeShowPageNumbers=false
readingRightMargin=5
swipeBrightness=true
webkitTextRendering=geometricPrecision

Also of note: Apparently adding text-rendering: optimizelegibility to the book's stylesheet does work as I am used to, which I suppose is a workable solution. It would just be nicer for it to be universally applied.

ps67 · 12-03-2022, 09:40 AM

Quote:

Originally Posted by Ansl

Patch log, sorry it's long, but I thought it would be more useful to be reminded of everything there is rather than just the things I have enabled, in case there really is a conflict somewhere.

Code:

Patching ./usr/local/Kobo/libnickel.so.1.0.0
  SKIP  `Allow USB storage even when device locked`
  APPLY `Allow rotation on all devices`
  SKIP  `Allow showing info panel on random screensaver`
  SKIP  `Always show confirmation dialog before upgrading`
  APPLY `Block WiFi firmware upgrade`
  SKIP  `Both page turn buttons go next`
  SKIP  `Both page turn sides go next`
  SKIP  `Bulgarian Phonetic Keyboard (GloHD/ClaraHD/AuraOne/H2O2/Forma/Libra)`
  SKIP  `Change Browse Kobo home screen link target - Activity`
  SKIP  `Change Wikipedia search language`
  SKIP  `Custom Sleep/Power-off timeouts`
  APPLY `Custom font sizes`
  SKIP  `Custom header/footer page number text`
  SKIP  `Custom kepub default margins`
  SKIP  `Custom left & right margins`
  APPLY `Custom navigation menu page number text`
  SKIP  `Customize ComfortLight settings`
  SKIP  `Cyrillic Keyboard (GloHD/ClaraHD/AuraOne/H2O2)`
  SKIP  `DeveloperSettings - AutoUsbGadget`
  SKIP  `Dictionary text font-family/font-size/line-height`
  SKIP  `Disable all tutorial dialogs`
  SKIP  `Don't grab exclusive access to event0`
  SKIP  `Don't uppercase header/footer text`
  APPLY `Don't uppercase header/footer text and change page number text`
  SKIP  `FeatureSettings - BookSpecificStats`
  SKIP  `FeatureSettings - ExportHighlights`
  SKIP  `FeatureSettings - FullScreenBrowser`
  SKIP  `FeatureSettings - MyWords`
  SKIP  `FeatureSettings - ShowFacebookShare`
  APPLY `Force user font-family in ePubs (Part 1 of 2)`
  APPLY `Force user line spacing in KePubs`
  APPLY `Force user line spacing in ePubs (part 1 of 2)`
  SKIP  `Greek Keyboard (GloHD/ClaraHD/AuraOne/H2O2)`
  SKIP  `Hide browser from beta features`
  SKIP  `Increase page navigation history`
  SKIP  `KePub stylesheet additions - text justify`
  SKIP  `KePub stylesheet additions - word-spacing`
  APPLY `Larger Sleep/Power-off timeouts`
  SKIP  `My 10 line spacing values`
  APPLY `My 24 line spacing values`
  SKIP  `Never show Kobo Plus, wishlist, and points SmartLinks`
  SKIP  `Only show Pocket SmartLink`
  SKIP  `Only show stats SmartLink`
  SKIP  `PowerSettings - UnlockEnabled`
  APPLY `Remove beta features not supported text`
  SKIP  `Remove line from bottom tab bar`
  APPLY `Remove recommendations (row1col2) from home screen`
  SKIP  `Remove title from reading header/footer`
  APPLY `Rename new home screen footer`
  APPLY `Replace adobe page numbers toggle with invert screen`
  APPLY `Set KePub hyphenation`
  SKIP  `Set visible SmartLink`
  SKIP  `Shorten dictionary entry not found message`
  SKIP  `Swap reading header/footer`
  APPLY `Un-Force user font-family in KePubs`
  SKIP  `Un-Force user text-align in div,p tags in KePubs`
  SKIP  `Un-force font-family override p tags (std epubs)`
  APPLY `Un-force link decoration in KePubs`
  APPLY `Unify font sizes`
  SKIP  `ePub constant font sharpness`
  SKIP  `ePub disable built-in body padding-bottom`
  SKIP  `ePub fixed top/bottom margins`

Patching ./usr/local/Kobo/nickel
  SKIP  `Change TOC level indentation`
  SKIP  `Custom collection/author header title font`
  APPLY `Custom header/footer captions`
  SKIP  `Custom page navigation scrubber`
  APPLY `Custom synopsis details line spacing`
  SKIP  `Custom synopsis font size`
  APPLY `Customise Header back button`
  SKIP  `Dictionary pop-up - increase available text area`
  SKIP  `Increase Book Details synopsis area`
  SKIP  `Increase headlines font`
  SKIP  `Increase home screen cover size`
  APPLY `Increase library cover size`
  SKIP  `Increase size of kepub chapter progress chart`
  SKIP  `New home screen subtitle custom font`
  SKIP  `Reduce new header/footer height`
  SKIP  `Reduce top/bottom page spacer`
  APPLY `Remove footer (row3) and increase cover size on new home screen`
  SKIP  `Remove footer (row3) on new home screen`
  SKIP  `Remove forgot pin button from lock screen`
  SKIP  `Series list increase cover thumbnails`
  APPLY `Show all games`

Patching ./usr/local/Kobo/libadobe.so
  SKIP  `Remove PDF map widget shown during panning`

Patching ./usr/local/Kobo/librmsdk.so.1.0.0
  SKIP  `Default ePub monospace font`
  APPLY `Default ePub sans-serif font (Gill Sans)`
  SKIP  `Default ePub serif font (Amasis)`
  SKIP  `Default ePub symbol font (Symbol)`
  APPLY `Disable orphans/widows avoidance`
  APPLY `Force user font-family in ePubs (Part 2 of 2)`
  APPLY `Force user line spacing in ePubs (Part 2 of 2)`
  SKIP  `Ignore ePub TOC navpoints`
  SKIP  `Ignore ePub book Adobe XPGT stylesheet (page-template.xpgt)`
  SKIP  `Ignore ePub book CSS and Adobe XPGT stylesheets`

and the relevant section of the config file

Code:

[Reading]
annotationsViewStyle=notebook
bookProgressType=2
fullScreenReading=true
numPartialUpdatePageTurns=1
pageTurnGesture=0
pageTurningOption=default
readingAdobeShowPageNumbers=false
readingRightMargin=5
swipeBrightness=true
webkitTextRendering=geometricPrecision

Also of note: Apparently adding text-rendering: optimizelegibility to the book's stylesheet does work as I am used to, which I suppose is a workable solution. It would just be nicer for it to be universally applied.

What happens if You set the patch "Remove beta features not supported text" to no?

Ansl · 12-03-2022, 10:19 AM

Quote:

Originally Posted by ps67

What happens if You set the patch "Remove beta features not supported text" to no?

nothing to how the text is rendered; it probably removes the disclaimer running on the top of the beta features menu, but I didn't look again before disabling the patch.

ZodWallop · 12-03-2022, 11:39 AM

Quote:

Originally Posted by Ansl

Also of note: Apparently adding text-rendering: optimizelegibility to the book's stylesheet does work as I am used to...

I don't understand. I thought you started this because webkitTextRendering=optimizelegibility wasn't working for you?

jackie_w · 12-03-2022, 12:12 PM

@Ansl,

Something doesn't add up, here. I've attached a 1-page test kepub and 3 screenshots from my Libra2 using 3 different fonts. As you can see, all fonts display at least some ligatures. Looking at the Amasis image I see ligatures for 'fi' and 'fl' but ligatures for 'ff', 'ffi', 'ffl' are not obvious in the Kobo built-in version of Amasis.

Rather than more aimless discussion please copy the attached kepub to your Kobo and compare what you see with Amasis (1st image) on your own device. Just copy the kepub using simple drag-drop with a USB connection. Don't use calibre or Dropbox or anything fancy as we don't want to introduce any unnecessary complications into what's happening.

RobertJSawyer · 12-08-2022, 06:56 PM

Using JackieW's kepub on my Kobo Libra 2 with webkitTextRendering=optimizelegibility, I find:

Ligatures:

Amasis
Caecilia
Kobo Tsukushi Mincho
Malabar

No ligatures:

Avenir Next
Georgia
Gil Sans
Kobo UD Kakugo
Kobo Nickel
Open Dyslexic
Rakutan Sans
Rakutan Serif

CyberPaul · 03-26-2023, 03:19 PM

Quote:

Originally Posted by jackie_w

@Ansl,

Something doesn't add up, here. I've attached a 1-page test kepub and 3 screenshots from my Libra2 using 3 different fonts. As you can see, all fonts display at least some ligatures. Looking at the Amasis image I see ligatures for 'fi' and 'fl' but ligatures for 'ff', 'ffi', 'ffl' are not obvious in the Kobo built-in version of Amasis.

Rather than more aimless discussion please copy the attached kepub to your Kobo and compare what you see with Amasis (1st image) on your own device. Just copy the kepub using simple drag-drop with a USB connection. Don't use calibre or Dropbox or anything fancy as we don't want to introduce any unnecessary complications into what's happening.

Hi Jackie_w, I know this is an old message, but I'm not able to find the Linux Libertine font as good as yours, with all ligatures correctly implemented. I tried the most recent version here (LinLibertineTTF_5.3.0_2012_07_02), but it is incomplete... some combinations are not correctly shown with the test kepub. Can you please provide the link of your exact version?
Many Thanks in advance!

12-02-2022, 02:06 PM	#1
Ansl Enthusiast Posts: 33 Karma: 5322 Join Date: Apr 2014 Location: Northern European utopia Device: Kobo H2O2v1	Optimizelegibility not working (Not sure if I should post here or in dev subforum, sorry if I'm in the wrong place.) So, I just updated my device from 4.18 to the newest firmware out of curiosity and to get the Oxford dictionary hassle-free... but I had to give up my trusty text-rendering patch and instead move it to the config file, and I just can't. get it. to stick. To be clear, the right line is in there, in the correct section all right, and I am indeed looking at a kepub file - but no matter what typeface I choose, I can't see a single ligature in my book. What am I doing wrong?? Is there such a thing as a conflicting patch still? I tried editing the file with both Notepad++ and (in a moment of desperation) standard Windows Notepad, and I've power cycled the device...and my other config options are still displaying correctly. Am sad and almost want to go back to paper books for the weekend. Help :(

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12-02-2022, 02:57 PM	#2
RobertJSawyer Guru Posts: 737 Karma: 4306712 Join Date: Jun 2006 Location: Toronto Device: Kobo Libra 2, Clara 2E, and Clara HD; Kindle PaperWhite	As far as I can tell, optimize legibility only enables kerning; I know of no way to enable ligatures in kepub files.

12-02-2022, 04:22 PM	#3
Ansl Enthusiast Posts: 33 Karma: 5322 Join Date: Apr 2014 Location: Northern European utopia Device: Kobo H2O2v1	The old patch did, for typefaces that had old style kerning and ligatures enabled. I can't even tell if this setting enables one but not the other because it's such a jarring difference. But thank you for the answer, I'll experiment a little and revert back to the old fw if needed.

12-02-2022, 05:00 PM	#4
ZodWallop Gentleman and scholar Posts: 11,478 Karma: 111164374 Join Date: Jun 2015 Location: Space City, Texas Device: Clara BW; Nook ST w/Glowlight, Paperwhite 3	Optimize legibility should enable ligatures. I use ligatures in my kepubs and have for years. I have switched to geometric precision as it keeps the ligatures and works better with spacing issues. Under [Reading], paste: webkitTextRendering=geometricPrecision And I just use Notepad in Windows 10.

12-02-2022, 06:30 PM	#6
Aleron Ives Wizard Posts: 1,686 Karma: 16307824 Join Date: Sep 2022 Device: Kobo Libra 2	Aren't ligatures part of the font itself? Maybe you're using a font that doesn't support them, or at least for which WebKit can't enable them?

12-08-2022, 06:56 PM	#14
RobertJSawyer Guru Posts: 737 Karma: 4306712 Join Date: Jun 2006 Location: Toronto Device: Kobo Libra 2, Clara 2E, and Clara HD; Kindle PaperWhite	Using JackieW's kepub on my Kobo Libra 2 with webkitTextRendering=optimizelegibility, I find: Ligatures: Amasis Caecilia Kobo Tsukushi Mincho Malabar No ligatures: Avenir Next Georgia Gil Sans Kobo UD Kakugo Kobo Nickel Open Dyslexic Rakutan Sans Rakutan Serif

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