mirror of
https://git.tartarus.org/simon/putty.git
synced 2025-05-09 13:42:09 -05:00
19353dca85
Switching to server-side rendering of X fonts under Cairo turned out to make text rendering much slower, at least on my laptop. This appears to be because PuTTY was asking the X server to render text into a 1-bit-per-pixel (bpp) pixmap before having Cairo composite into the terminal surface. On modern X servers 1bpp pixmaps are slow, being largely un-accelerated. Happily, it is possible to get Cairo to use an 8bpp pixmap instead, and this is rather faster. It's a bit inconvenient, though, because first we have to confirm that that the X Rendering Extensions is present and find the correct picture format. That requires linking in libXrender, which means a bit of CMake faff. For now, I've make libXrender mandatory (for X11 builds), but it and the corresponding Cairo functions could be made optional fairly simply. This hasn't actually made text rendering as much faster as I'd like on my laptop. While creating 1bpp pixmaps is nearly free, creating 8bpp pixmaps takes significant time because they actually involve the GPU. So I think now I need to rework my persistent-pixmap patch to work on top of this one.
PuTTY source code README
========================
This is the README for the source code of PuTTY, a free Windows and
Unix Telnet and SSH client.
PuTTY is built using CMake <https://cmake.org/>. To compile in the
simplest way (on any of Linux, Windows or Mac), the general method is
to run these commands in the source directory:
cmake .
cmake --build .
These commands will expect to find a usable compile toolchain on your
path. So if you're building on Windows with MSVC, you'll need to make
sure that the MSVC compiler (cl.exe) is on your path, by running one
of the 'vcvars32.bat' setup scripts provided with the tools. Then the
cmake commands above should work.
To install in the simplest way on Linux or Mac:
cmake --build . --target install
On Unix, pterm would like to be setuid or setgid, as appropriate, to
permit it to write records of user logins to /var/run/utmp and
/var/log/wtmp. (Of course it will not use this privilege for
anything else, and in particular it will drop all privileges before
starting up complex subsystems like GTK.) The cmake install step
doesn't attempt to add these privileges, so if you want user login
recording to work, you should manually ch{own,grp} and chmod the
pterm binary yourself after installation. If you don't do this,
pterm will still work, but not update the user login databases.
Documentation (in various formats including Windows Help and Unix
`man' pages) is built from the Halibut (`.but') files in the `doc'
subdirectory. If you aren't using one of our source snapshots,
you'll need to do this yourself. Halibut can be found at
<https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.
The PuTTY home web site is
https://www.chiark.greenend.org.uk/~sgtatham/putty/
If you want to send bug reports or feature requests, please read the
Feedback section of the web site before doing so. Sending one-line
reports saying `it doesn't work' will waste your time as much as
ours.
See the file LICENCE for the licence conditions.