Thanks David, Comments below. On 15-01-19 12:36 PM, David Lattimore wrote: > Matching with an FC_CHARSET works for me. No idea if what I'm doing is right, > but roughly what I do is: > - Identify script for each character > (using http://unicode.org/Public/UNIDATA/Scripts.txt) > - Split runs based on script (so that no run has two different scripts) > - Build an FC_CHARSET for the run. > - Match and use the resulting font. While this works, it will be extremely slow, and results in ransom-note effects whereas eg adding a diacritic mark to a run will change the font for the entire run. What most clients of Fontconfig do instead is to call FcFontSort() for all desired properties but NOT FC_CHARSET, and then walk down the returned list of font and pick the first font that supports each desired character. Does that make sense? behdad > So if a font didn't define all the characters in a script, I might still get > some missing glyphs. But it seems to work reasonably well. If I wanted to make > sure all characters had glyphs, I could probably so a second round of > splitting where adjacent characters for which no glyphs was found were broken > off into a separate text run and rematched. So far I haven't bothered. > > Hope that helps. > > On 19 January 2015 at 22:51, Sam Varshavchik <mrsam@xxxxxxxxxxxxxxx > <mailto:mrsam@xxxxxxxxxxxxxxx>> wrote: > > Akira TAGOH writes: > > That way is what Pango do to figure out the glyph coverage in fonts. > they convert the result into their own structure so that it's not that > easy to find out a font that have the certain coverage in fontconfig only. > > > You mean match by FC_CHARSET? That was the first part of what I'm trying > to figure out, whether creating an FcCharset containing the unicode > characters in the text, and then trying to match a font using it, will work. > > > On Mon, Jan 19, 2015 at 12:51 PM, Sam Varshavchik > <<URL:mailto:mrsam@courier-__mta.com > <mailto:mrsam@xxxxxxxxxxxxxxx>>mrsam@xxxxxxxxxxxxxxx > <mailto:mrsam@xxxxxxxxxxxxxxx>> wrote: > > I'm learning the fontconfig API, and I'm trying to figure out how to do > the following. > > I have arbitrary Unicode text, and I would like to match a > reasonable font > to use for displaying it. It's possible that I might need more than one > font if, say, the text is a mixture of Latin characters and Asian > ideographs. > > I see that FC_CHARSET is an option to FcPattern. Does this sound > like I'm > on the right track: > > A) Construct an FcCharset and add all unicode characters in the text to > display > > B) Add it as a FC_CHARSET value to an FcPattern. > > C) Use FcFontList() to search for the matching font. > > The developer reference contains the following statement: > "Fontconfig uses > some of these properties for font matching and font completion. > Others are > provided as a convenience for the application's rendering mechanism." > > So, I guess I'm trying to clarify whether I can use the FC_CHARSET > property to search for fonts that have coverage for my unicode > text, or if > this a non-searchable property, only. > > > > _______________________________________________ > Fontconfig mailing list > Fontconfig@xxxxxxxxxxxxxxxxxxxxx <mailto:Fontconfig@xxxxxxxxxxxxxxxxxxxxx> > http://lists.freedesktop.org/mailman/listinfo/fontconfig > > > > > _______________________________________________ > Fontconfig mailing list > Fontconfig@xxxxxxxxxxxxxxxxxxxxx > http://lists.freedesktop.org/mailman/listinfo/fontconfig > -- behdad http://behdad.org/ _______________________________________________ Fontconfig mailing list Fontconfig@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/fontconfig
