Am Thu, 18 Mar 2021 09:56:00 +0100 schrieb "'Kay F. Jahnke' via hugin and other free panoramic software" <[email protected]>:
> Am 17.03.21 um 19:11 schrieb Kornel Benko:
> > Am Wed, 17 Mar 2021 17:52:10 +0100
> > schrieb "'Kay F. Jahnke' via hugin and other free panoramic software"
>
> >> @Kornel: Maybe cmake can produce something like a pv_config.h header
> >> which has such platform-specific information? That should not be too
> >> hard - and it might be nice to maybe have a bit more platform-specific
> >> info at hand, like the user's home directory, to put stuff in which
> >> persists from session to session, and the location of the binary...
> >>
> >> I wouldn't be surprised if cmake does that all the time - I'm just not
> >> very good at it.
> >>
> >
> > I can do that. I have to know the variable-names and their value.
> > And of course the desired name of the header file.
>
> Sorry, @Kornel, I think this was yet another one of my quick shots. I
> have doubts now after sleeping over it. If you were to generate a C++
> header file which is compiled into the program, the resulting binary
> contains a hard-coded path - even if this is only the third option if
> the other two options fail. Can we be sure that such a binary will not
> be produced/used on another platform/distro where it's bound to fail?
Sure we can. Because the installed ttf is exactly there, where it is expected.
In CMakeLists we specify the destination. You have to use 'PV_FONTDATADIR' in
pv_no_rendering.cc to find the font.
> I've thought about this some more, and I think the ideal solution would
> be to have an agent which resides on a machine and can produce
> system-specific information. What I'd like is something which is not
> part of the program, but local to the machine, yet can be accessed in a
> platform-independent way. How about environment variables? As far as I
> know they are available on every platform and they are accessible from
> C++ via a standard header. To get the information into the program, they
> are definitely a viable path. What do you think?
This agent would also have the same problem, so I am not optimistic.
> If we were to go with this idea, the question is, how can we *set* the
> environment variables in a platform-specific way, i.e. set an
> environment variable LUX_GUI_FONT to
> /usr/local/share/lux/Sansation_Regular.ttf on ubuntu? We can't use cmake
> directly, because it won't be available on the user's machine, so there
> must be an indirect way. If the installation process could set the
> required variables persistently, builders could modify that step to fit
> their needs, and the binary would remain platform-independent. I
> wouldn't be surprised if cmake's package-building code would have
> built-in support to set environment variables, but I couldn't find it
> when I looked just now. One problem with session-wide environment
> variables is that they won't be available until the user has logged in
> again (speaking about linux here, if we were to modify e.g. ~/.profile)
No need, since the executable knows the position.
> Another way to have the right environment variable would be to launch
> lux via a helper script, which I like anyway because it's a good way for
> experienced users to configure the launch. The script can export the
> environment variable, then launch lux. I think I'd favor this option.
Sure, that is how I am using it, but is not ideal IMO.
> I have added code to pv_no_rendering.cc to try and glean the value of an
> environment variable LUX_GUI_PATH, if neither the GUI font from the
> command line (if any) nor in the pwd (if any) can be loaded. It's the
> 'last resort'. With this option in the code, we can experiment if this
> idea is a viable path.
I have seen it already. Again, why not use PV_FONTDATADIR?
> @Bruno: what do you think of this idea?
>
> Kay
>
The patch in CMakeLists.txt should take care of blanks in path to the ttf file.
Kornel
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diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7bf029f..3542fce 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -159,13 +159,13 @@ install(TARGETS ${_pv} DESTINATION bin)
if(UNIX)
set(DataDir "${CMAKE_INSTALL_PREFIX}/share/${_pv}/")
elseif(WIN32)
set(DataDir "${CMAKE_INSTALL_PREFIX}/Resources/")
elseif(APPLE)
- set(DataDir "${CMAKE_INSTALL_PREFIX}/${_pv}.app/Contents/Resources")
+ set(DataDir "${CMAKE_INSTALL_PREFIX}/${_pv}.app/Contents/Resources/")
endif()
-add_definitions(" -DPV_FONTDATADIR=${DataDir}/fonts")
+add_definitions(" -DPV_FONTDATADIR=\"${DataDir}fonts\"")
install(FILES Sansation_Regular.ttf Sansation_1.31_ReadMe.txt DESTINATION
"${DataDir}/fonts")
set(CPACK_PACKAGE_INSTALL_DIRECTORY ${CMAKE_INSTALL_PREFIX})
pgpsbnh0xLNny.pgp
Description: Digitale Signatur von OpenPGP
