Merge pull request #858 from psychon/wallpaper-function

Wallpaper function

awesomerc.lua

@@ -168,7 +168,12 @@ mytasklist.buttons = awful.util.table.join(
 awful.screen.connect_for_each_screen(function(s)
     -- Wallpaper
     if beautiful.wallpaper then
-        gears.wallpaper.maximized(beautiful.wallpaper, s, true)
+        local wallpaper = beautiful.wallpaper
+        -- If wallpaper is a function, call it with the screen
+        if type(wallpaper) == "function" then
+            wallpaper = wallpaper(s)
+        end
+        gears.wallpaper.maximized(wallpaper, s, true)
     end
 
     -- Each screen has its own tag table.

themes/xresources/assets.lua

@@ -47,10 +47,12 @@ function theme_assets.taglist_squares_unsel(size, fg)
 end
 
 
-function theme_assets.wallpaper(bg, fg, alt_fg)
-    local height = screen[1].workarea.height
-    local width = screen[1].workarea.width
-    local img = cairo.ImageSurface(cairo.Format.ARGB32, width, height)
+function theme_assets.wallpaper(bg, fg, alt_fg, s)
+    s = s or screen.primary
+    local height = s.workarea.height
+    local width = s.workarea.width
+    local img = cairo.RecordingSurface(cairo.Content.COLOR,
+        cairo.Rectangle { x = 0, y = 0, width = width, height = height })
     local cr = cairo.Context(img)
 
     local letter_size = height/10

themes/xresources/theme.lua

@@ -91,9 +91,9 @@ local wallpaper_alt_fg = xrdb.color12
 if not is_dark_bg then
     wallpaper_bg, wallpaper_fg = wallpaper_fg, wallpaper_bg
 end
-theme.wallpaper = theme_assets.wallpaper(
-    wallpaper_bg, wallpaper_fg, wallpaper_alt_fg
-)
+theme.wallpaper = function(s)
+    return theme_assets.wallpaper(wallpaper_bg, wallpaper_fg, wallpaper_alt_fg, s)
+end
 
 return theme