doc: add a diagram for evemu and note that libinput doesn't recordings

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

doc/Makefile.am

@@ -34,6 +34,7 @@ diagram_files = \
 	$(srcdir)/dot/libinput-stack-wayland.gv \
 	$(srcdir)/dot/libinput-stack-xorg.gv \
 	$(srcdir)/dot/libinput-stack-gnome.gv \
+	$(srcdir)/dot/evemu.gv \
 	$(srcdir)/svg/software-buttons.svg \
 	$(srcdir)/svg/clickfinger.svg \
 	$(srcdir)/svg/button-scrolling.svg \

doc/dot/evemu.gv

@@ -0,0 +1,19 @@
+digraph stack
+{
+  compound=true;
+  rankdir="LR";
+  node [
+    shape="box";
+  ]
+
+  kernel [label="Kernel"];
+
+  libinput;
+  xserver [label="X Server"];
+
+  kernel -> libinput
+  libinput -> xserver
+
+  kernel -> evemu
+  evemu -> stdout
+}

doc/reporting-bugs.dox

@@ -85,4 +85,10 @@ $ sudo evemu-play /dev/input/event4 < scroll.evemu
 If the bug is triggered by replaying on your device, attach the recording to
 the bug report.
 
+@note libinput does not affect the evemu recording. libinput and evemu talk
+directly to the kernel's device nodes. An evemu recording is not influenced
+by the libinput version or whether a libinput context is currently active.
+
+@dotfile evemu.gv
+
 */