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-rw-r--r--runtime/doc/options.txt29
1 files changed, 26 insertions, 3 deletions
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 3888d9f426..f844213630 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -6154,11 +6154,34 @@ A jump table for the options with a short description can be found at |Q_op|.
Example: >
set encoding=utf-8
- set gfn=Ricty_Diminished:h12:cSHIFTJIS
+ set gfn=Ricty_Diminished:h12
set rop=type:directx
<
- If select a raster font (Courier, Terminal or FixedSys) to
- 'guifont', it fallbacks to be drawn by GDI automatically.
+ If select a raster font (Courier, Terminal or FixedSys which
+ have ".fon" extension in file name) to 'guifont', it will be
+ drawn by GDI as a fallback. This fallback will cause
+ significant slow down on drawing.
+
+ NOTE: It is known that some fonts and options combination
+ causes trouble on drawing glyphs.
+
+ - 'rendmode:5' and 'renmode:6' will not work with some
+ special made fonts (True-Type fonts which includes only
+ bitmap glyphs).
+ - 'taamode:3' will not work with some vector fonts.
+
+ NOTE: With this option, you can display colored emoji
+ (emoticon) in Windows 8.1 or later. To display colored emoji,
+ there are some conditions which you should notice.
+
+ - If your font includes non-colored emoji already, it will
+ be used.
+ - If your font doesn't have emoji, the system chooses an
+ alternative symbol font. On Windows 10, "Segoe UI Emoji"
+ will be used.
+ - When this alternative font didn't have fixed width glyph,
+ emoji might be rendered beyond the bounding box of drawing
+ cell.
Other render types are currently not supported.