Re: [GSoC] Subpixel glyph positioning - Looking for a mentor

[Alexander Farrow]

Hi Mike,

Kaganski Mike wrote:
>Oh! I didn't realize that I was in the explicit CC list; since I never
>worked with font rendering stuff closely, I even didn't consider myself
>as a potential mentor. Sorry, but I don't have required skills.

Not a problem, apologies for the confusion.


>But of course, I'm ready to answer any questions in the course of the project
>(be it GSoC or otherwise) as much as I have knowledge. I consider this
>task an important thins, so it's in my scope of interest.

Awesome, thanks in advance for your help.

- Alex

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Re: [GSoC] Subpixel glyph positioning - Looking for a mentor

[Kaganski Mike]

On 04.04.2019 19:56, Alexander Farrow wrote:
> Hi Jan-Marek,
> 
> Thank you for your reply.
> 
>      I have added some potential mentors, which are normally also 
> interested in font
>      rendering. As much as I could potentially do some mentoring, as I 
> know a share
>      of SalLayout and VCL, I have just minimal idea about text rendering, 
> mainly from
>      the time writing the Qt5 VCL backend. I'm willing to do some larger 
> share of it.
>      Someone of you want to share?
> 
> I'm extremely glad to hear that you are happy to be a mentor for this 
> project, as
> I am very keen to continue working on this for GSoC. Thank you for CC'ing 
> Mike and
> Khaled, hopefully we can find another mentor to join us on this project.

Oh! I didn't realize that I was in the explicit CC list; since I never 
worked with font rendering stuff closely, I even didn't consider myself 
as a potential mentor. Sorry, but I don't have required skills. But of 
course, I'm ready to answer any questions in the course of the project 
(be it GSoC or otherwise) as much as I have knowledge. I consider this 
task an important thins, so it's in my scope of interest.

-- 
Best regards,
Mike Kaganski
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Re: [GSoC] Subpixel glyph positioning - Looking for a mentor

[Alexander Farrow]

Hi Jan-Marek,

Thank you for your reply.

    I have added some potential mentors, which are normally also interested 
in font
    rendering. As much as I could potentially do some mentoring, as I know 
a share
    of SalLayout and VCL, I have just minimal idea about text rendering, 
mainly from
    the time writing the Qt5 VCL backend. I'm willing to do some larger 
share of it.
    Someone of you want to share?

I'm extremely glad to hear that you are happy to be a mentor for this project, 
as
I am very keen to continue working on this for GSoC. Thank you for CC'ing Mike 
and
Khaled, hopefully we can find another mentor to join us on this project.

    There is also https://gerrit.libreoffice.org/#/c/62219 


    Interesting post for a different problem with the same solution: 
Getting real
    linearly-scalable text
    (https://lists.cairographics.org/archives/cairo/2008-May/014149.html 
)
    But it's also 10 years old...

    The image link still works and show the (potentially long fixed?) 
problem
    https://www.flickr.com/photos/behdad/2493693932/sizes/o 


    Then there is
    
https://www.unicodeconference.org/presentations/S5T2-Röttsches-Esfahbod.pdf 

    - that's from 2016.
    It's not about positioning, but a nice overview of Chromes text 
rendering
    evolution, as Behdad Esfahbod is working for Google for quite some time.

Thanks for the links, I'll give them a read through. Any resources regarding 
text
rendering are greatly appreciated.

I've continued familiarising myself with the text layout code and I've got a 
couple
of simple patches to submit for review. I've finished looking into how to change
GlyphItem to use floating point values for glyph positioning and I'm now looking
into how to change DeviceCoordinate from a long to a double.

I think to move forward with the project the next step is to get the proposal 
finished
and submitted. I've got the first draft ready and although it is a WIP I was 
wondering
if I could send it to you for some feedback?

I look forward to working with you on this project.

Thanks,
Alex (IRC: AlexanderFarrow)
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Re: [GSoC] Subpixel glyph positioning - Looking for a mentor

[Jan-Marek Glogowski]

Hi Alexander,

Am 29.03.19 um 17:06 schrieb Alexander Farrow:
> For GSoC 2019 I would love to work on the "Sub-pixel and stable glyph 
> positioning" project from the
> list of ideas without a mentor:
> https://bugs.documentfoundation.org/show_bug.cgi?id=103322
> 
> I'm particularly interested in this project as I experience poor glyph 
> positioning quite often as a
> LibreOffice user.
> 
> To achieve the required skills for this project I read the "State of text 
> rendering" paper  by Behdad
> Esfahbod to further my understanding of text rendering. I've also followed 
> the HarfBuzz tutorial to
> develop a primitive text rendering program.

This is more then 10 years old. I have no idea how much it represents the
current state.

> I've been familiarising myself with the LibreOffice text rendering code 
> particularly CommonSalLayout.
> I've written a very small patch for this file, changing a variable from 
> tools::Point to basegfx::B2DPoint
> to add support for floating point values.
> 
> I've followed the Bugzilla comments and I'm now looking into what changes 
> will need to be made
> throughout the code-base to store the glyph positions in a floating point 
> variable. Specifically, I'm
> currently looking into how to make the following code changes:
> 
> 1. DeviceCoordinate -  Change from a long to a double.
> 2. GlyphItem - Change m_aLinearPos from tools::Point to basegfx::B2DPoint. 
> Change m_nOrigWidth
> from an int to a double. Change m_nXOffset from an int to a double.

There is also https://gerrit.libreoffice.org/#/c/62219/

Interesting post for a different problem with the same solution: Getting real
linearly-scalable text
(https://lists.cairographics.org/archives/cairo/2008-May/014149.html)
But it's also 10 years old...

The image link still works and show the (potentially long fixed?) problem
https://www.flickr.com/photos/behdad/2493693932/sizes/o/

Then there is
https://www.unicodeconference.org/presentations/S5T2-R%c3%b6ttsches-Esfahbod.pdf
- that's from 2016.
It's not about positioning, but a nice overview of Chromes text rendering
evolution, as Behdad Esfahbod is working for Google for quite some time.

> I am hoping that somebody would like to be my mentor for this project.

I have added some potential mentors, which are normally also interested in font
rendering. As much as I could potentially do some mentoring, as I know a share
of SalLayout and VCL, I have just minimal idea about text rendering, mainly from
the time writing the Qt5 VCL backend. I'm willing to do some larger share of it.
Someone of you want to share?

ATB

Jan-Marek

P.S. this is potentially cross-platform and I just have Linux.
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