[Windows] Simplified Chinese UI causes English letters to be blurry (YaHei in use)

[mide8915]

Environment:

• OS: Windows 11, Simplified Chinese region/language
• Game version: RCT Classic（Steam）
• Rendering: drawing_engine = SOFTWARE_HWD
• Fonts: msyh.ttc installed (verified), system language set to Simplified Chinese (China)
• DPI scaling: software handling in compatibility settings (UNCHECKED Auto-scaling)

Problem
When I select other languages (e.g., English or Traditional Chinese) in the game options, all English letters and digits are displayed clearly in Microsoft YaHei.
However, when switching to Simplified Chinese interface, only Chinese characters appear sharp, while English letters and numbers become noticeably blurry.

Screenshots :

(Include both UI states in same resolution/zoom for comparison.)

Attempted workarounds :

• Software rendering enabled
• qt.conf with fontengine=freetype,nodirectwrite,dpiawareness=0
• .bat launcher disabling Qt DPI scaling (QT_ENABLE_HIGHDPI_SCALING=0)
• Verified system msyh.ttc, no config.ini font overrides
• Cleared Windows font cache, system restarted

None of the above resolved the blurriness specifically in Simplified Chinese mode.

Reasoning :
It seems the game’s font fallback or rendering routine in Simplified Chinese mode treats English text differently, possibly bypassing YaHei or hinting settings.
This issue does not occur in other language modes, making it likely a language-specific Qt rendering bug in OpenRCT2.

Suggested info for devs:

• Could you add an option to force use of YaHei font for all text?
• Or consider unifying font fallback logic across all language modes?

[AaronVanGeffen]

OpenRCT2 uses bitmap font glyphs where available. In this case, the YaHei font has bitmaps available for hanzi, making them easy to read at small font sizes. However, it appears it does not have such glyphs for other symbols.

Ultimately, the solution for this issue will be to translate the remaining strings into Chinese, I think. The issue might have already been alleviated by #3251. If not, please feel free to submit a patch.

[Gymnasiast]

OpenRCT2 does not use Qt by the way, it uses Freetype directly.