Add warning when not using glx backend

tryone144 · Feb 22, 2018 · 964085c · 964085c
1 parent 34aa5a8
commit 964085c
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diff --git a/man/compton.1.asciidoc b/man/compton.1.asciidoc
@@ -207,6 +207,8 @@ OPTIONS
 
 *--blur-method* 'ALGORITHM'::
 	Specify the algorithm for background blur. It is either one of: `convolution` (default), `kawase`.
++
+Note: `kawase` only works with the `glx` backend.
 
 *--blur-strength* 'LEVEL'::
 	Only valid for *--blur-method kawase*!

diff --git a/src/compton.c b/src/compton.c
@@ -6127,6 +6127,12 @@ get_cfg(session_t *ps, int argc, char *const *argv, bool first_pass) {
     ps->o.track_leader = true;
   }
 
+  // Blur method kawase is not compatible with the xrender backend
+  if (ps->o.backend != BKEND_GLX && ps->o.blur_method == BLRMTHD_KAWASE) {
+      printf_errf("(): Blur method 'kawase' is incompatible with the XRender backend. Fall back to default.\n");
+      ps->o.blur_method = BLRMTHD_CONV;
+  }
+
   // Fill default blur kernel
   if (ps->o.blur_background && (BLRMTHD_CONV == ps->o.blur_method) && !ps->o.blur_kerns[0]) {
     // Convolution filter parameter (box blur)