[ft] TrueType interpreter modes: v35 v v40

[Artem S. Tashkinov]

Hello,

I need your help, guys.

It's said (1) that the new v40 TrueType interpreter mode works better 
than v35 while retaining the same speed however in my experience v35 is 
_miles_ better in regard to core fonts.

Here's what I see:

FREETYPE_PROPERTIES=truetype:interpreter-version=35 firefox -> 35.png
FREETYPE_PROPERTIES=truetype:interpreter-version=40 firefox -> 40.png

v40 looks dirty, bold and untidy, whereas v35 is neat, slim and 
beautiful.

Also in v40 different letters have different witdths! Compare https -> 
"h" "p" "s" all have normal width, both "t"s are bold!

Changing hintstyle to hintslight hasn't really improved the fonts.

Autohinting kills them completely.

My ~/.config/fontconfig/fonts.conf looks this way:

<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
 <match target="font" >
  <edit mode="assign" name="lcdfilter" >
   <const>lcdlegacy</const>
  </edit>
  <edit mode="assign" name="hinting" >
   <bool>true</bool>
  </edit>
  <edit mode="assign" name="hintstyle" >
   <const>hintfull</const>
  </edit>
  <edit mode="assign" name="rgba" >
   <const>rgb</const>
  </edit>
 </match>
</fontconfig>

I'm curious what I'm doing wrong. My freetype 2.8 is compiled this way:

#define FT_CONFIG_OPTION_SUBPIXEL_RENDERING
/* #define FT_CONFIG_OPTION_USE_HARFBUZZ */
#define TT_CONFIG_OPTION_BYTECODE_INTERPRETER
#define TT_CONFIG_OPTION_SUBPIXEL_HINTING  ( 1 | 2 )

Web fonts look totally ugly with both v35 and v40.

Please advise!

1. https://www.freetype.org/freetype2/docs/subpixel-hinting.html

--
Best regards,

Artem

40.png
Description: PNG image

35.png
Description: PNG image