Misc: --paint-exclude & #119

- Add --paint-exclude to prevent certain windows from being painted, for
  debugging purposes.

- Add predefined matching target "x", "y", "width", "height", "widthb",
  "heightb", "border_width", and "fullscreen".

- Fix bug #119, wrong man page install dir in CMake configuration.
  Thanks to sstewartgallus for reporting.

man/CMakeLists.txt

@@ -43,4 +43,4 @@ include(GNUInstallDirs)
 install(FILES
 	"compton.1"
 	"compton-trans.1"
-	DESTINATION "${CMAKE_INSTALL_MANDIR}" COMPONENT doc)
+	DESTINATION "${CMAKE_INSTALL_MANDIR}/man1" COMPONENT doc)

src/c2.c

@@ -1043,6 +1043,14 @@ c2_match_once_leaf(session_t *ps, win *w, const c2_l_t *pleaf,
           *perr = false;
           switch (pleaf->predef) {
             case C2_L_PID:      tgt = wid;                      break;
+            case C2_L_PX:       tgt = w->a.x;                   break;
+            case C2_L_PY:       tgt = w->a.y;                   break;
+            case C2_L_PWIDTH:   tgt = w->a.width;               break;
+            case C2_L_PHEIGHT:  tgt = w->a.height;              break;
+            case C2_L_PWIDTHB:  tgt = w->widthb;                break;
+            case C2_L_PHEIGHTB: tgt = w->heightb;               break;
+            case C2_L_PBDW:     tgt = w->a.border_width;        break;
+            case C2_L_PFULLSCREEN: tgt = win_is_fullscreen(ps, w); break;
             case C2_L_POVREDIR: tgt = w->a.override_redirect;   break;
             case C2_L_PARGB:    tgt = (WMODE_ARGB == w->mode);  break;
             case C2_L_PFOCUSED: tgt = w->focused_real;          break;

src/c2.h

@@ -99,6 +99,14 @@ struct _c2_l {
   enum {
     C2_L_PUNDEFINED,
     C2_L_PID,
+    C2_L_PX,
+    C2_L_PY,
+    C2_L_PWIDTH,
+    C2_L_PHEIGHT,
+    C2_L_PWIDTHB,
+    C2_L_PHEIGHTB,
+    C2_L_PBDW,
+    C2_L_PFULLSCREEN,
     C2_L_POVREDIR,
     C2_L_PARGB,
     C2_L_PFOCUSED,
@@ -177,6 +185,14 @@ typedef struct {
 // Predefined targets.
 const static c2_predef_t C2_PREDEFS[] = {
   [C2_L_PID         ] = { "id"                , C2_L_TCARDINAL  , 0  },
+  [C2_L_PX          ] = { "x"                 , C2_L_TCARDINAL  , 0  },
+  [C2_L_PY          ] = { "y"                 , C2_L_TCARDINAL  , 0  },
+  [C2_L_PWIDTH      ] = { "width"             , C2_L_TCARDINAL  , 0  },
+  [C2_L_PHEIGHT     ] = { "height"            , C2_L_TCARDINAL  , 0  },
+  [C2_L_PWIDTHB     ] = { "widthb"            , C2_L_TCARDINAL  , 0  },
+  [C2_L_PHEIGHTB    ] = { "heightb"           , C2_L_TCARDINAL  , 0  },
+  [C2_L_PBDW        ] = { "border_width"      , C2_L_TCARDINAL  , 0  },
+  [C2_L_PFULLSCREEN ] = { "fullscreen"        , C2_L_TCARDINAL  , 0  },
   [C2_L_POVREDIR    ] = { "override_redirect" , C2_L_TCARDINAL  , 0  },
   [C2_L_PARGB       ] = { "argb"              , C2_L_TCARDINAL  , 0  },
   [C2_L_PFOCUSED    ] = { "focused"           , C2_L_TCARDINAL  , 0  },

src/common.h

@@ -468,6 +468,8 @@ typedef struct {
   int benchmark;
   /// Window to constantly repaint in benchmark mode. 0 for full-screen.
   Window benchmark_wid;
+  /// A list of conditions of windows not to paint.
+  c2_lptr_t *paint_blacklist;
   /// Whether to work under synchronized mode for debugging.
   bool synchronize;
 
@@ -896,6 +898,8 @@ typedef struct _win {
   bool rounded_corners;
   /// Whether this window is to be painted.
   bool to_paint;
+  /// Whether the window is painting excluded.
+  bool paint_excluded;
   /// Whether this window is in open/close state.
   bool in_openclose;
 
@@ -936,6 +940,7 @@ typedef struct _win {
   const c2_lptr_t *cache_ivclst;
   const c2_lptr_t *cache_bbblst;
   const c2_lptr_t *cache_oparule;
+  const c2_lptr_t *cache_pblst;
 
   // Opacity-related members
   /// Current window opacity.
@@ -1720,6 +1725,17 @@ rect_is_fullscreen(session_t *ps, int x, int y, unsigned wid, unsigned hei) {
       && (x + wid) >= ps->root_width && (y + hei) >= ps->root_height);
 }
 
+/**
+ * Check if a window is a fullscreen window.
+ *
+ * It's not using w->border_size for performance measures.
+ */
+static inline bool
+win_is_fullscreen(session_t *ps, const win *w) {
+  return rect_is_fullscreen(ps, w->a.x, w->a.y, w->widthb, w->heightb)
+      && !w->bounding_shaped;
+}
+
 /**
  * Determine if a window has a specific property.
  *

src/compton.c

@@ -1128,6 +1128,8 @@ paint_preprocess(session_t *ps, win *list) {
       to_paint = false;
     }
 
+    to_paint = to_paint && !w->paint_excluded;
+
     if (to_paint) {
       // If opacity changes
       if (w->opacity != opacity_old) {
@@ -2493,6 +2495,9 @@ win_on_factor_change(session_t *ps, win *w) {
     win_determine_blur_background(ps, w);
   if (ps->o.opacity_rules)
     win_update_opacity_rule(ps, w);
+  if (ps->o.paint_blacklist)
+    w->paint_excluded = win_match(ps, w, ps->o.paint_blacklist,
+        &w->cache_pblst);
 }
 
 /**
@@ -2934,6 +2939,8 @@ configure_win(session_t *ps, XConfigureEvent *ce) {
       restack_win(ps, w, ce->above);
     }
 
+    bool factor_change = false;
+
     // Windows restack (including window restacks happened when this
     // window is not mapped) could mess up all reg_ignore
     ps->reg_ignore_expire = true;
@@ -2949,6 +2956,7 @@ configure_win(session_t *ps, XConfigureEvent *ce) {
     if (w->a.x != ce->x || w->a.y != ce->y
         || w->a.width != ce->width || w->a.height != ce->height
         || w->a.border_width != ce->border_width) {
+      factor_change = true;
       free_region(ps, &w->extents);
       free_region(ps, &w->border_size);
     }
@@ -2979,6 +2987,9 @@ configure_win(session_t *ps, XConfigureEvent *ce) {
       XFixesDestroyRegion(ps->dpy, extents);
       add_damage(ps, damage);
     }
+
+    if (factor_change)
+      win_on_factor_change(ps, w);
   }
 
   // override_redirect flag cannot be changed after window creation, as far
@@ -5217,6 +5228,7 @@ get_cfg(session_t *ps, int argc, char *const *argv, bool first_pass) {
     { "glx-use-gpushader4", no_argument, NULL, 303 },
     { "opacity-rule", required_argument, NULL, 304 },
     { "shadow-exclude-reg", required_argument, NULL, 305 },
+    { "paint-exclude", required_argument, NULL, 306 },
     // Must terminate with a NULL entry
     { NULL, 0, NULL, 0 },
   };
@@ -5460,6 +5472,10 @@ get_cfg(session_t *ps, int argc, char *const *argv, bool first_pass) {
         if (!parse_geometry(ps, optarg, &ps->o.shadow_exclude_reg_geom))
           exit(1);
         break;
+      case 306:
+        // --paint-exclude
+        condlst_add(ps, &ps->o.paint_blacklist, optarg);
+        break;
       default:
         usage(1);
         break;
@@ -6817,6 +6833,7 @@ session_destroy(session_t *ps) {
   free_wincondlst(&ps->o.invert_color_list);
   free_wincondlst(&ps->o.blur_background_blacklist);
   free_wincondlst(&ps->o.opacity_rules);
+  free_wincondlst(&ps->o.paint_blacklist);
 #endif
 
   // Free tracked atom list

src/compton.h

@@ -478,17 +478,6 @@ dump_drawable(session_t *ps, Drawable drawable) {
   }
 }
 
-/**
- * Check if a window is a fullscreen window.
- *
- * It's not using w->border_size for performance measures.
- */
-static inline bool
-win_is_fullscreen(session_t *ps, const win *w) {
-  return rect_is_fullscreen(ps, w->a.x, w->a.y, w->widthb, w->heightb)
-      && !w->bounding_shaped;
-}
-
 static void
 win_rounded_corners(session_t *ps, win *w);