2015-02-02 10:46 GMT+01:00 Igor Stasenko <siguctua@gmail.com>:

On 2 February 2015 at 01:06, Nicolai Hess <nicolaihess@web.de> wrote:

Ok, the best I could do:

Sadly, it only works because I changed the default lcd_filter from cairo.

in cairo 1.7. was a public API for the lcd_filter.

since 1.8 this API is private again (the code for the different filter settings is still there).
You can choose between

FT_LCD_FILTER_NONE
FT_LCD_FILTER_LEGACY
FT_LCD_FILTER_LIGHT
FT_LCD_FILTER_DEFAULT

the default is�� FT_LCD_FILTER_LEGACY

but for this (so far, the best) result I used

FT_LCD_FILTER_DEFAULT

But there is no public API for this function anymore, so I had to
change the code.

We have to discuss how we proceed.

The problems:

font rendering looks ugly ( at least for small font size like for menus, lists and codepanes)
font rendering looks different on windows and linux

possible solutions:

change build options for Freetype on Windos (enable FT_CONFIG_OPTION_SUBPIXEL_RENDERING, potential patent infringement?)

change default filter (patching cairo source)

or we leave everything as it is.
I do not know, and I'm starting to lose all interest.

I guess, to understand what happens, best would be to write a small C app,

that does the rendering.. and see what goes where.

Something doesn't works there.. but i was unable to figure what or why.

I doubt that changing freetype library build settings is right way to deal with issue,
because
a) both cairo/freetype used on linux out of the box

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But I think freetype on linux has this config enabled (and in fact, the rendering looks

different on windows and linux until I changed that option for windows)

and I read somewhere, that ubunut(or other distributions?) patched cairo, just

to�� get this filter setting api back.

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b) many many apps, using these libs to render with subpixel quality.

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This is what drives�� me crazy, doing text rendering right, is difficult yes, but this is

the reason why we are using dedicated libraries.

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Best regards,
Igor Stasenko.