Hi All
I have identified some issues with current TTC font implementation in windows
environment.
The sample scenario is this:
If you try to create the font Meiryo with both bold and italic set to true ,
the returned is Meiryo Bold, and similarly if you go for Meiryo Italic, you
will get Meiryo.
I have identified the cause for this.
For ttc fonts , the data returned by GetFontData (windows) function will have
data for multiple fonts. So we need to extract the correct font. This is done
by extracting font family name, font style etc and matching it against the
input.
Currently the matching is done against only font family name. Meiryo and Meiryo
Italic has the same family name, Meiryo. So the code stops when it encounters
Meiryo and returns the incorrect font.
Also there is an additional draw back with the current implementation (in my
opinion) of matching font family name against input font name. For ttf fonts ,
I can give input as fontname='Arial Bold Italic', bold='false' , italic
='false' and still get the correct Arial Bold Italic font. Please note that,
here I have passed the font full name , instead of font family name and
styles. If I do the same with ttc fonts , ie if I pass the font name 'Meiryo
Bold Italic' I will not get any font as the matching is done against font
family name. I guess font full name also needs to be considered while matching
is done.
Most of the action happens at GetFontFromCollection() and GetDataFromHFONT()
in PdfFontCache.cpp .
I guess with this information would be helpful for someone ready to fix the
issue.
Additionally currently there is an overloaded method for CreateFont () to
create font from LOGFONTW structure( in windows). I guess a similar method for
CreateFontSubset() would also be useful.
Thanks and Regards
Ali
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