On Tue, Apr 28, 2015 at 1:43 PM, Urs Liska <u...@openlilylib.org> wrote:
> > > Am 28.04.2015 um 20:16 schrieb David Nalesnik: > > Hi Urs, > > On Tue, Apr 28, 2015 at 11:38 AM, Urs Liska <u...@openlilylib.org> wrote: > >> >> >> Am 28.04.2015 um 18:14 schrieb Urs Liska: >> >>> >>> >>> Am 28.04.2015 um 17:53 schrieb Urs Liska: >>> >>>> I think I have found something. >>>> >>>> After some experimenting with a copy of font-config-get-font-file and >>>> trying different approaches I could guess from the documentations available >>>> I found that replacing an item in the FcPatternGetString call this function >>>> returns the font name and not the Postscript name or the font file. >>>> >>>> The following preliminary function (if added to font-config-scheme.cc) >>>> returns either the Font Name (if the font exists) or "Emmentaler-11" (on my >>>> system) if it doesn't exist. I assume it would return other names on other >>>> systems: >>>> >>>> LY_DEFINE (ly_font_config_font_exists, "ly:font-config-font-exists", 1, >>>> 0, 0, >>>> >>>> ... >>>> >>>> Best >>>> Urs >>>> >>> >>> Wrapping this Scheme function around that: >>> >>> fontExists = >>> #(define-scheme-function (parser location font-name)(string?) >>> (string=? font-name (ly:font-config-font-exists font-name))) >>> >>> shows that my idea is right: The C++ function returns the family name of >>> either the given font or the (system-dependent) fallback font. Now all >>> there would be to it is moving the comparison of the latter Scheme function >>> to the C++ function . >>> >>> Urs >>> >> >> >> Last one for this working session: The following function >> ly:font-config-font-exists will return true or false depending on whether >> the given font is available. > > > I tried this out on my VM (Ubuntu 10.04.4 -- yes, I need to update to > the most recent LilyDev...) > > Should it work for any font that's listed by > ly:font-config-display-fonts? It works for most of the names I've tried, > though not all. For example. "Kedage" returns #f. > > > AFAICS it should, What is the "font name" of Kedage? > Here is a part of the output of (display (ly:font-config-display-fonts): family DejaVu Sans Mono DejaVu Sans Mono:style=Book family DejaVu Sans Mono DejaVu Sans Mono:style=Bold family Century Schoolbook L Century Schoolbook L:style=BoldItalic family Liberation Serif Liberation Serif:style=Italic family Umpush Umpush:style=BoldOblique family Kedage Kedage:style=Normal family Lohit Bengali Lohit Bengali:style=Regular I simply used the family name, so \fontExists "Kedage" Doing so with this list, all return #t except Kedage and Umpush. Both (display (ly:font-config-get-font-file "Kedage")) and (display (ly:font-config-get-font-file "Umpush")) return /usr/share/fonts/truetype/thai/TlwgTypo.ttf so I presume I am using the right name for the two fonts. > You could try out with my version from the second-to-last post, which > returns the "plain" result of the fontconfig lookup. > OK, here with both Umpush and Kedage I get Tlwg Typo \fontExists "Tlwg Typo" does in fact return #t with the later patch. but then one of the entries from ly:font-config-display-fonts is family Tlwg Typo Tlwg Typo:style=Oblique ...so I'm pretty sure I understand nothing of what is going on here :( > > > > >> The only drawback (yet) is that now the comparison is case sensitive. But >> *that* should be easy now? >> > > I don't find anything convenient. I suppose you could just convert both > strings to lower- or uppercase and then compare. > > > An Unicode/utf8 things to consider here? > Yes, there's that. I find this link: http://stackoverflow.com/questions/11635/case-insensitive-string-comparison-in-c Maybe there's something useful there. > > > > But is this desirable? I mean, is LilyPond ever case-insensitive? > > > Well, when calling *text* fonts it has always been case insensitive. And I > would like to keep that because you can't really look into the fonts to > know how they are capitalized. So I'd be happy if we can make music fonts > case insensitive too instead of the other way round. > Makes sense to me. David
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