[Bug 47689] New: When DirectWrite rendering is enabled in Notepad++ performance is inacceptable
wine-bugs at winehq.org
wine-bugs at winehq.org
Tue Aug 27 13:26:37 CDT 2019
https://bugs.winehq.org/show_bug.cgi?id=47689
Bug ID: 47689
Summary: When DirectWrite rendering is enabled in Notepad++
performance is inacceptable
Product: Wine
Version: unspecified
Hardware: x86
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: -unknown
Assignee: wine-bugs at winehq.org
Reporter: kolan_n at mail.ru
Distribution: ---
[Notepad++](https://github.com/notepad-plus-plus/notepad-plus-plus) is an
application based on Scintilla.
Scintilla is a library for creating textareas.
[DirectWrite](https://docs.microsoft.com/en-us/windows/win32/directwrite/direct-write-portal)
is an API for text rendering with subpixel antialiasing which can be
hardware-accelerated using Direct2D.
[SCI_SETTECHNOLOGY](https://www.scintilla.org/ScintillaDox.html#SCI_SETTECHNOLOGY)
is a enum value identifying a call to Scintilla (in fact it is done using
Windows messages).
When it is set to values > 0 (SC_TECHNOLOGY_DIRECTWRITE,
SC_TECHNOLOGY_DIRECTWRITERETAIN, or SC_TECHNOLOGY_DIRECTWRITEDC), Scintilla
uses DirectDraw accelerated via Direct2D for rendering instead of an own
surrogate.
In Windows >7 everything works fine.
In Wine performance is damn bad - single screen update takes several seconds.
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