[Bug 32947] Broken font rendering with many fonts (including Microsoft core fonts) in wine 1.5

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=32947

--- Comment #15 from Constantine Gavrilov <constantine.gavrilov at gmail.com> 2013-02-11 10:24:06 CST ---
Both are the same.

Namely:

>From the freetype documentation:

Quote:


FT_Library_SetLcdFilter
Defined in FT_LCD_FILTER_H (freetype/ftlcdfil.h).


  FT_EXPORT( FT_Error )
  FT_Library_SetLcdFilter( FT_Library    library,
                           FT_LcdFilter  filter );


This function is used to apply color filtering to LCD decimated bitmaps, like
the ones used when calling FT_Render_Glyph with FT_RENDER_MODE_LCD or
FT_RENDER_MODE_LCD_V.

input

library    

A handle to the target library instance.
filter    

The filter type.

You can use FT_LCD_FILTER_NONE here to disable this feature, or
FT_LCD_FILTER_DEFAULT to use a default filter that should work well on most LCD
screens.
return

FreeType error code. 0 means success.
note

This feature is always disabled by default. Clients must make an explicit call
to this function with a ‘filter’ value other than FT_LCD_FILTER_NONE in order
to enable it.

Due to PATENTS covering subpixel rendering, this function doesn't do anything
except returning ‘FT_Err_Unimplemented_Feature’ if the configuration macro
FT_CONFIG_OPTION_SUBPIXEL_RENDERING is not defined in your build of the
library, which should correspond to all default builds of FreeType.

End of quote


Both 32-bit and 64-bit of freetype library are built with
FT_CONFIG_OPTION_SUBPIXEL_RENDERING undefined. This is a standard policy of all
distributions that ship freetype library.

This means that FT_Library_SetLcdFilter() will return
FT_Err_Unimplemented_Feature. Yet, subpixel rendering works both in KDE and
Gnome using freetype and fontconfig.

This has been the situation for years and I do not know what is the trick
(either freetype lies about not supporting subpixel or uses partial
functionality) but all opensource applications (including wine before 1.5) were
able to use the subpixel rendering with these builds.

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