[rrd-users] Default font is not used

[Tobias Oetiker]

Victor,

Today Victor Engmark wrote:

> On Mon, Feb 28, 2011 at 5:36 PM, Victor Engmark
> <victor.engmark at gmail.com> wrote:
> > I've tried to compile rrdtool (with pangocairo + fontconfig etc.) with
> > lots of different options, but I can't figure out how to make it use
> > the font I've provided. Whenever I run `rrdtool graph` it complains:
> >
> > (process:18744): Pango-WARNING **: failed to choose a font, expect
> > ugly output. engine-type='PangoRenderFc', script='common'
> >
> > The resulting PNG file contains rectangles instead of characters.
> > Apropos, specifying .svg instead of .png still results in PNG file
> > contents...
> >
> > I've compiled using
> > --with-freetype-config=/usr/opt/rrdtool/share/fonts/VeraMono.ttf, and
> > I've verified that that path exists and is readable after
> > installation. Please note that this is a custom minimal Linux
> > platform, so standard packaging systems (apt-get, emerge, yum) do
> > *not* apply.

note that in connection with fontconfig you do not specify a font
filename but only a font name ... with VeraMono this would be Vera
Mono, note that this already happens by default, no need to change
it at compile time ... just make sure Vera Mono is available on
your system ... check with fc-list

cheers
tobi


> >
> > Possible issues:
> > * Do I *have* to have a fontconfig configuration file for this font?
> > `/usr/opt/cairopango/bin/fc-cache -fv /usr/opt/rrdtool/share/fonts/`
> > says "
> > /usr/opt/rrdtool/share/fonts: caching, new cache contents: 1 fonts, 0
> > dirs", but I still get the same message afterwards.
>
> Update: An strace of the fc-cache command above shows that it's using
> the previously compiled binaries, and the resulting .cache-3 file
> contains the specified directory. No mention of VeraMono.ttf, but then
> I'm not sure if that's how fontconfig configuration cache files work.
> fc-list doesn't show anything, which is odd but could be because
> fc-list only lists configured fonts (the man page is not clear about
> this). `man fc-cache` says "[files generated by fc-cache] are  read
> by  the  fontconfig library at application startup to locate
> appropriate fonts," which doesn't seem to be the case here.
>
> An strace of `rrdtool graph` shows that it's aware of the font
> configuration files, but doesn't mention the cache (see below). Does
> rrdtool use the currently cached fonts or parse the font configuration
> to figure out which font to use?
>
> ...
> open("/usr/opt/cairopango/lib/libfontconfig.so.1", O_RDONLY) = 3
> read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\0A\0\0004\0\0\0<"...,
> 512) = 512
> fstat64(3, {st_mode=S_IFREG|0755, st_size=430102, ...}) = 0
> mmap2(NULL, 186308, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
> 0) = 0xb7b26000
> mmap2(0xb7b52000, 8192, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2b) = 0xb7b52000
> close(3)                                = 0
> ...
> access("/usr/opt/cairopango/etc/fonts/fonts.conf", R_OK) = 0
> stat64("/usr/opt/cairopango/etc/fonts/fonts.conf",
> {st_mode=S_IFREG|0644, st_size=5237, ...}) = 0
> open("/usr/opt/cairopango/etc/fonts/fonts.conf", O_RDONLY) = 3
> read(3, "<?xml version=\"1.0\"?>\n<!DOCTYPE f"..., 8192) = 5237
> access("/usr/opt/cairopango/etc/fonts/conf.d", R_OK) = 0
> stat64("/usr/opt/cairopango/etc/fonts/conf.d", {st_mode=S_IFDIR|0755,
> st_size=4096, ...}) = 0
> open("/usr/opt/cairopango/etc/fonts/conf.d",
> O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 4
> fstat64(4, {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
> fcntl64(4, F_SETFD, FD_CLOEXEC)         = 0
> getdents64(4, /* 3 entries */, 4096)    = 80
> getdents64(4, /* 0 entries */, 4096)    = 0
> close(4)                                = 0
> read(3, ""..., 8192)                    = 0
> close(3)                                = 0
> stat64("/usr/opt/cairopango/lib/pango/1.6.0/modules/pango-basic-fc.so",
> {st_mode=S_IFREG|0755, st_size=27485, ...}) = 0
> open("/usr/opt/cairopango/lib/pango/1.6.0/modules/pango-basic-fc.so",
> O_RDONLY) = 3
> read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0`\f\0\0004\0\0\0T"...,
> 512) = 512
> fstat64(3, {st_mode=S_IFREG|0755, st_size=27485, ...}) = 0
> mmap2(NULL, 9688, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
> 0) = 0xb8095000
> mmap2(0xb8097000, 4096, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1) = 0xb8097000
> close(3)                                = 0
> getpid()                                = 23931
> write(2, "\n(process:23931): Pango-WARNING *"..., 126
> (process:23931): Pango-WARNING **: failed to choose a font, expect
> ugly output. engine-type='PangoRenderFc', script='common'
> ) = 126
> getpid()                                = 23931
> write(2, "\n(process:23931): Pango-WARNING *"..., 125
> (process:23931): Pango-WARNING **: failed to choose a font, expect
> ugly output. engine-type='PangoRenderFc', script='latin'
> ) = 125
>
>

-- 
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch tobi at oetiker.ch ++41 62 775 9902 / sb: -9900