[Fontconfig] How to block glyph fallback in a QT application?

[suzuki toshiya]

> I would appreciate very much your comments to the quoted passages: what is the meaning of "script" or "writing system" in this context? How the system can check whether the font supports a given script or not? Is it a property of a font? If so, how is it encoded?

Please take a glance on the document about OpenType text layout system;
http://www.microsoft.com/typography/otspec/TTOCHAP1.htm
The document uses the word "language system", but it would be almost
same with the "writing system" in this context.

Regards,
mpsuzuki

On 01/07/2014 04:24 PM, Janusz S. Bien wrote:
> Quote/Cytat - "Janusz S. Bien" <jsbien at mimuw.edu.pl> (Mon 06 Jan 2014 04:58:44 PM CET):
> 
>>> Gucharmap has an option to turn off fallback, and so does Pango, but for
>>> a Qt application you will need a Qt solution.
> 
> For archive, I've found
> 
> http://harmattan-dev.nokia.com/docs/platform-api-reference/xml/daily-docs/libqt4/qfont.html
> 
> "QFont::NoFontMerging    0x8000    If the font selected for a certain writing system does not contain a character requested to draw, then Qt automatically chooses a similar looking font that contains the character. The NoFontMerging flag disables this feature. Please note that enabling this flag will not prevent Qt from automatically picking a suitable font when the selected font does not support the writing system of the text."
> 
> and
> 
> https://bugreports.qt-project.org/browse/QTBUG-9816
> 
> "Add style strategy to QFont to turn off automatic font resolution completely
> 
> The QFont::NoFontMerging flag turns off font merging within a single script item, but still allows automatically picking different fonts for each script item if the currently selected font does not support the script in question."
> 
> I would appreciate very much your comments to the quoted passages: what is the meaning of "script" or "writing system" in this context? How the system can check whether the font supports a given script or not? Is it a property of a font? If so, how is it encoded?
> 
> Best regards
> 
> Janusz
>