Korean text rendering

[Sung-Jae, Cho]

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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