Korean text rendering

[Igor Mironchik]

Hi.

I almost sure already this is Intel HD 620 graphics not enough for 
Koreans :)

But I wait for test on your side.

Thank you.

On 15.05.2025 12:02, Sung-Jae, Cho wrote:
> Hi, again.
>
> First test is done with Virtual Box.
> I captured a video and please check the clip below.
> https://drive.google.com/file/d/1WXl4CxMv1iNkO72F_5uXnLyOGVG33ytA/view?usp=sharing
> I think it is not much delayed.
> After installing OpenSuse tumbleweed, I added ibus-hangul package with 
> ibus-daemon, google-noto-sans-kr fonts.
> Maybe it is related to the graphic card driver, on the next installing 
> notebook with HD620 graphic core.
>
> On Thu, May 15, 2025 at 5:15 PM Sung-Jae, Cho <cho.sungjae at gmail.com> 
> wrote:
>
>     Thanks for the information. :)
>
>     Additionally, I'll test with an Intel HD Graphics 620 notebook, too.
>
>     On Thu, May 15, 2025 at 5:09 PM Igor Mironchik
>     <igor.mironchik at gmail.com> wrote:
>
>         On 15.05.2025 10:44, Sung-Jae, Cho wrote:
>>         I'll try again with openSUSE Tumbleweed. :)
>>         Please, wait a day. I'll try with virtual machines and real
>>         machines, both.
>>         And if you can bring some hardware information with a video
>>         card driver, xorg-driver, etc,
>>         it'll be helpful for finding the cause.
>
>         Operating System: openSUSE Tumbleweed 20250512 KDE Plasma
>         Version: 6.3.5 KDE Frameworks Version: 6.14.0 Qt Version:
>         6.9.0 Kernel Version: 6.14.5-1-default (64-bit) Graphics
>         Platform: X11 Processors: 4 × Intel® Core™ i5-7200U CPU @
>         2.50GHz Memory: 7,6 GiB of RAM Graphics Processor: llvmpipe
>         Manufacturer: HP Product Name: HP ProBook 640 G3
>
>         Extended renderer info (GLX_MESA_query_renderer):
>
>         Vendor: Intel (0x8086)
>
>         Device: Mesa Intel(R) HD Graphics 620 (KBL GT2) (0x5916)
>
>         Version: 25.0.5
>
>         Accelerated: yes
>
>         Video memory: 3909MB
>
>         Unified memory: yes
>
>         Preferred profile: core (0x1)
>
>         Max core profile version: 4.6
>
>         Max compat profile version: 4.6
>
>         Max GLES1 profile version: 1.1
>
>         Max GLES[23] profile version: 3.2
>
>         OpenGL vendor string: Intel
>
>         OpenGL renderer string: Mesa Intel(R) HD Graphics 620 (KBL GT2)
>
>         OpenGL core profile version string: 4.6 (Core Profile) Mesa 25.0.5
>
>         OpenGL core profile shading language version string: 4.60
>
>         OpenGL core profile context flags: (none)
>
>         OpenGL core profile profile mask: core profile
>
>         EGL driver name: iris
>
>         EGL_MESA_image_dma_buf_export, EGL_MESA_query_driver,
>
>         EGL driver name: iris
>
>         EGL_MESA_gl_interop, EGL_MESA_image_dma_buf_export,
>         EGL_MESA_query_driver,
>
>         EGL driver name: iris
>
>         EGL_MESA_image_dma_buf_export, EGL_MESA_query_driver,
>
>         EGL driver name: iris
>
>         EGL_MESA_image_dma_buf_export, EGL_MESA_query_driver,
>
>         EGL driver name: swrast
>
>         EGL_MESA_image_dma_buf_export, EGL_MESA_query_driver,
>
>>
>>         On Thu, May 15, 2025 at 4:38 PM Igor Mironchik
>>         <igor.mironchik at gmail.com> wrote:
>>
>>
>>             On 15.05.2025 08:49, Konstantin Kharlamov wrote:
>>             > On Thu, 2025-05-15 at 08:37 +0300, Igor Mironchik wrote:
>>             >> On 15.05.2025 08:29, Konstantin Kharlamov wrote:
>>             >>> On Thu, 2025-05-15 at 06:29 +0300, Igor Mironchik wrote:
>>             >>>> Hi.
>>             >>>>
>>             >>>> Are any Korean here? I'm curious if they have very bad
>>             >>>> performance of
>>             >>>> rendering Korean text in any Qt application? Or is
>>             this just
>>             >>>> because
>>             >>>> of
>>             >>>> missing some fonts on my system? I see a huge
>>             performance
>>             >>>> slowdown on
>>             >>>> Korean text rendering.
>>             >>> How did you measure? I'm not a Korean, but I tried
>>             pasting a Korean
>>             >>> wiki article to Kate with "Droid Sans [1ASC]" font
>>             and scrolling
>>             >>> and I
>>             >>> don't see any change in performance. Perhaps some
>>             more scientific
>>             >>> method required.
>>             >>
>>             >> I paste in Kate a Korean text (~1kB), it took so much
>>             time to paste
>>             >> and
>>             >> render it (~5 seconds), and Kate starts to think a lot
>>             even on
>>             >> navigating in menu.
>>             >>
>>             >> The same with English or Russian text - I don't see
>>             any delays, Kate
>>             >> is
>>             >> responsive.
>>             > I see. Seems something specific to your system — I just
>>             created a 158K
>>             > text file by copy-pasting a Korean Wiki article a dozen
>>             of times, and
>>             > when I open it in Kate, everything is smooth and nice.
>>             >
>>             > Is it maybe the font? What font do you use? Can you try
>>             going to Kate
>>             > settings and changing the font to "Droid Sans [1ASC]"
>>             (on Archlnux it's
>>             > a `ttf-droid` package) and seeing if that makes any
>>             difference?
>>
>>             I guess too this is system specific. I'm on openSUSE
>>             Tumbleweed.
>>             Changing editor's font to Droid Sans doesn't help.
>>
>>             Ok. I see that this issue is system specific, so my
>>             question is
>>             answered. Maybe somebody can check this issue on
>>             Tumbleweed only?
>>
>>             Thank you.
>>
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