Introduce drawables

A drawable is something that you can draw to, just like a drawin. However, a
drawable isn't necessarily its own windows. This will later on be used to
implement titlebars where the titlebars are drawables.

Signed-off-by: Uli Schlachter <psychon@znc.in>

CMakeLists.txt

@@ -70,6 +70,7 @@ set(AWE_SRCS
     ${SOURCE_DIR}/common/xutil.c
     ${SOURCE_DIR}/objects/button.c
     ${SOURCE_DIR}/objects/client.c
+    ${SOURCE_DIR}/objects/drawable.c
     ${SOURCE_DIR}/objects/drawin.c
     ${SOURCE_DIR}/objects/key.c
     ${SOURCE_DIR}/objects/tag.c

globalconf.h

@@ -47,6 +47,7 @@
       | XCB_EVENT_MASK_PROPERTY_CHANGE \
     }
 
+typedef struct drawable_t drawable_t;
 typedef struct drawin_t drawin_t;
 typedef struct a_screen screen_t;
 typedef struct button_t button_t;

lib/wibox/init.lua.in

@@ -34,7 +34,7 @@ local function do_redraw(_wibox)
     end
 
     local geom = _wibox.drawin:geometry()
-    local cr = cairo.Context(surface(_wibox.drawin.surface))
+    local cr = cairo.Context(surface(_wibox.drawin.drawable.surface))
 
     -- Draw the background
     cr:save()
@@ -59,7 +59,7 @@ local function do_redraw(_wibox)
         _wibox:widget_at(_wibox.widget, 0, 0, geom.width, geom.height)
     end
 
-    _wibox.drawin:refresh()
+    _wibox.drawin.drawable:refresh()
 end
 
 --- Register a widget's position.

luaa.c

@@ -39,6 +39,7 @@
 #include "objects/tag.h"
 #include "objects/client.h"
 #include "objects/drawin.h"
+#include "objects/drawable.h"
 #include "screen.h"
 #include "event.h"
 #include "selection.h"
@@ -581,6 +582,9 @@ luaA_init(xdgHandle* xdg)
     /* Export window */
     window_class_setup(L);
 
+    /* Export drawable */
+    drawable_class_setup(L);
+
     /* Export drawin */
     drawin_class_setup(L);
 

luadoc/drawable.lua

@@ -0,0 +1,44 @@
+--- awesome drawable API
+-- @author Uli Schlachter <psychon@znc.in>
+-- @copyright 2012 Uli Schlachter
+module("drawable")
+
+--- Drawable object.
+-- @field surface The drawable's cairo surface.
+-- @name drawable
+
+--- Get drawable geometry. The geometry consists of x, y, width and height.
+-- @param no_params luadoc is buggy.
+-- @return A table with drawable coordinates and geometry.
+-- @name geometry
+-- @class function
+
+--- Refresh the drawable. When you are drawing to the surface, you have
+-- call this function when you are done to make the result visible.
+-- @param no_params luadoc is buggy.
+-- @name refresh
+-- @class function
+
+--- Add a signal.
+-- @param name A signal name.
+-- @param func A function to call when the signal is emitted.
+-- @name connect_signal
+-- @class function
+
+--- Remove a signal.
+-- @param name A signal name.
+-- @param func A function to remove.
+-- @name disconnect_signal
+-- @class function
+
+--- Emit a signal.
+-- @param name A signal name.
+-- @param ... Various arguments, optional.
+-- @name emit_signal
+-- @class function
+
+--- Get the number of instances.
+-- @param no_params luadoc is buggy.
+-- @return The number of drawable objects alive.
+-- @name instances
+-- @class function

luadoc/drawin.lua

@@ -15,7 +15,7 @@ module("drawin")
 -- @field y The y coordinates.
 -- @field width The width of the drawin.
 -- @field height The height of the drawin.
--- @field surface A cairo surface as light user datum that can be used for drawing.
+-- @field drawable The drawin's drawable.
 -- @class table
 -- @name drawin
 
@@ -37,12 +37,6 @@ module("drawin")
 -- @name geometry
 -- @class function
 
---- Refresh the drawin. When you are drawing to the window's surface, you have
--- call this function when you are done to make the result visible.
--- @param no_params luadoc is buggy.
--- @name refresh
--- @class function
-
 --- Add a signal.
 -- @param name A signal name.
 -- @param func A function to call when the signal is emitted.

objects/drawable.c

@@ -0,0 +1,162 @@
+/*
+ * drawable.c - drawable functions
+ *
+ * Copyright © 2008-2009 Julien Danjou <julien@danjou.info>
+ * Copyright © 2010-2012 Uli Schlachter <psychon@znc.in>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include "drawable.h"
+
+#include <cairo-xcb.h>
+
+static lua_class_t drawable_class;
+
+LUA_OBJECT_FUNCS(drawable_class, drawable_t, drawable)
+
+drawable_t *
+drawable_allocator(lua_State *L, cairo_surface_t *surface, drawable_refresh_callback *callback, void *data)
+{
+    drawable_t *d = drawable_new(L);
+    d->refresh_callback = callback;
+    d->refresh_data = data;
+    drawable_set_surface(d, surface);
+    return d;
+}
+
+static void
+drawable_wipe(drawable_t *d)
+{
+    drawable_set_surface(d, NULL);
+}
+
+void
+drawable_set_surface(drawable_t *d, cairo_surface_t *surface)
+{
+    if (d->surface) {
+        cairo_surface_finish(d->surface);
+        cairo_surface_destroy(d->surface);
+    }
+
+    d->surface = cairo_surface_reference(surface);
+
+    if (d->surface != NULL)
+    {
+        /* Make sure the surface doesn't contain garbage by filling it with black */
+        cairo_t *cr = cairo_create(surface);
+        cairo_set_operator(cr, CAIRO_OPERATOR_CLEAR);
+        cairo_paint(cr);
+        cairo_destroy(cr);
+    }
+}
+
+void
+drawable_set_geometry(drawable_t *d, int didx, area_t geom)
+{
+    area_t old = d->geometry;
+    d->geometry = geom;
+
+    if (old.x != geom.x)
+        luaA_object_emit_signal(globalconf.L, didx, "property::x", 0);
+    if (old.y != geom.y)
+        luaA_object_emit_signal(globalconf.L, didx, "property::y", 0);
+    if (old.width != geom.width)
+        luaA_object_emit_signal(globalconf.L, didx, "property::width", 0);
+    if (old.height != geom.height)
+        luaA_object_emit_signal(globalconf.L, didx, "property::height", 0);
+}
+
+/** Get a drawable's surface
+ * \param L The Lua VM state.
+ * \param drawable The drawable object.
+ * \return The number of elements pushed on stack.
+ */
+static int
+luaA_drawable_get_surface(lua_State *L, drawable_t *drawable)
+{
+    /* Lua gets its own reference which it will have to destroy */
+    lua_pushlightuserdata(L, cairo_surface_reference(drawable->surface));
+    return 1;
+}
+
+/** Refresh a drawable's content. This has to be called whenever some drawing to
+ * the drawable's surface has been done and should become visible.
+ * \param L The Lua VM state.
+ * \return The number of elements pushed on stack.
+ */
+static int
+luaA_drawable_refresh(lua_State *L)
+{
+    drawable_t *drawable = luaA_checkudata(L, 1, &drawable_class);
+    (*drawable->refresh_callback)(drawable->refresh_data);
+
+    return 0;
+}
+
+/** Return drawable geometry.
+ * \param L The Lua VM state.
+ * \return The number of elements pushed on stack.
+ * \luastack
+ * \lreturn A table with drawable coordinates.
+ */
+static int
+luaA_drawable_geometry(lua_State *L)
+{
+    drawable_t *d = luaA_checkudata(L, 1, &drawable_class);
+    return luaA_pusharea(L, d->geometry);
+}
+
+void
+drawable_class_setup(lua_State *L)
+{
+    static const struct luaL_Reg drawable_methods[] =
+    {
+        LUA_CLASS_METHODS(drawable)
+        { NULL, NULL }
+    };
+
+    static const struct luaL_Reg drawable_meta[] =
+    {
+        LUA_OBJECT_META(drawable)
+        LUA_CLASS_META
+        { "refresh", luaA_drawable_refresh },
+        { "geometry", luaA_drawable_geometry },
+        { NULL, NULL },
+    };
+
+    luaA_class_setup(L, &drawable_class, "drawable", NULL,
+                     (lua_class_allocator_t) drawable_new,
+                     (lua_class_collector_t) drawable_wipe, NULL,
+                     luaA_class_index_miss_property, luaA_class_newindex_miss_property,
+                     drawable_methods, drawable_meta);
+    luaA_class_add_property(&drawable_class, "surface",
+                            NULL,
+                            (lua_class_propfunc_t) luaA_drawable_get_surface,
+                            NULL);
+
+    signal_add(&drawable_class.signals, "button::press");
+    signal_add(&drawable_class.signals, "button::release");
+    signal_add(&drawable_class.signals, "mouse::enter");
+    signal_add(&drawable_class.signals, "mouse::leave");
+    signal_add(&drawable_class.signals, "mouse::move");
+    signal_add(&drawable_class.signals, "property::height");
+    signal_add(&drawable_class.signals, "property::width");
+    signal_add(&drawable_class.signals, "property::x");
+    signal_add(&drawable_class.signals, "property::y");
+}
+
+// vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80

objects/drawable.h

@@ -0,0 +1,52 @@
+/*
+ * drawable.h - drawable functions header
+ *
+ * Copyright © 2007-2009 Julien Danjou <julien@danjou.info>
+ * Copyright © 2010-2012 Uli Schlachter <psychon@znc.in>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef AWESOME_OBJECTS_DRAWABLE_H
+#define AWESOME_OBJECTS_DRAWABLE_H
+
+#include "common/luaclass.h"
+#include "globalconf.h"
+
+typedef void drawable_refresh_callback(void *);
+
+/** drawable type */
+struct drawable_t
+{
+    LUA_OBJECT_HEADER
+    /** Surface for drawing. */
+    cairo_surface_t *surface;
+    /** The geometry of the drawable (in root window coordinates). */
+    area_t geometry;
+    /** Callback for refreshing. */
+    drawable_refresh_callback *refresh_callback;
+    /** Data for refresh callback. */
+    void *refresh_data;
+};
+
+drawable_t *drawable_allocator(lua_State *, cairo_surface_t *,
+        drawable_refresh_callback *, void *);
+void drawable_set_surface(drawable_t *, cairo_surface_t *);
+void drawable_set_geometry(drawable_t *, int, area_t);
+void drawable_class_setup(lua_State *);
+
+#endif
+// vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80

objects/drawin.c

@@ -61,14 +61,7 @@ drawin_wipe(drawin_t *w)
     /* The drawin must already be unmapped, else it
      * couldn't be garbage collected -> no unmap needed */
     p_delete(&w->cursor);
-    if(w->surface)
-    {
-        /* Make sure that cairo knows that this surface can't be unused anymore.
-         * This is needed since lua could still have a reference to it. */
-        cairo_surface_finish(w->surface);
-        cairo_surface_destroy(w->surface);
-        w->surface = NULL;
-    }
+    cairo_surface_finish(w->drawable->surface);
     if(w->window)
     {
         /* Activate BMA */
@@ -85,6 +78,8 @@ drawin_wipe(drawin_t *w)
         xcb_free_pixmap(globalconf.connection, w->pixmap);
         w->pixmap = XCB_NONE;
     }
+    luaA_object_unref_item(globalconf.L, -1, w->drawable);
+    w->drawable = NULL;
 }
 
 void
@@ -94,20 +89,14 @@ drawin_unref_simplified(drawin_t **item)
 }
 
 static void
-drawin_update_drawing(drawin_t *w)
+drawin_update_drawing(drawin_t *w, int widx)
 {
     /* If this drawin isn't visible, we don't need an up-to-date cairo surface
      * for it. (drawin_map() will later make sure we are called again) */
     if(!w->visible)
         return;
     /* Clean up old stuff */
-    if(w->surface)
-    {
-        /* In case lua still got a reference to the surface, it still won't be
-         * able to do anything with it because we finish it. */
-        cairo_surface_finish(w->surface);
-        cairo_surface_destroy(w->surface);
-    }
+    drawable_set_surface(w->drawable, NULL);
     if(w->pixmap)
         xcb_free_pixmap(globalconf.connection, w->pixmap);
 
@@ -117,14 +106,14 @@ drawin_update_drawing(drawin_t *w)
     xcb_create_pixmap(globalconf.connection, globalconf.default_depth, w->pixmap, s->root,
                       w->geometry.width, w->geometry.height);
     /* and create a surface for that pixmap */
-    w->surface = cairo_xcb_surface_create(globalconf.connection,
-                                          w->pixmap, globalconf.visual,
-                                          w->geometry.width, w->geometry.height);
-    /* Make sure the pixmap doesn't contain garbage by filling it with black */
-    cairo_t *cr = cairo_create(w->surface);
-    cairo_set_operator(cr, CAIRO_OPERATOR_CLEAR);
-    cairo_paint(cr);
-    cairo_destroy(cr);
+    cairo_surface_t *surface = cairo_xcb_surface_create(globalconf.connection,
+                                                        w->pixmap, globalconf.visual,
+                                                        w->geometry.width, w->geometry.height);
+    drawable_set_surface(w->drawable, surface);
+
+    luaA_object_push_item(globalconf.L, widx, w->drawable);
+    drawable_set_geometry(w->drawable, -1, w->geometry);
+    lua_pop(globalconf.L, 1);
 }
 
 /** Initialize a drawin.
@@ -208,7 +197,7 @@ drawin_moveresize(lua_State *L, int udx, area_t geometry)
     }
 
     if(mask_vals & (XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT))
-        drawin_update_drawing(w);
+        drawin_update_drawing(w, udx);
 
     /* Activate BMA */
     client_ignore_enterleave_events();
@@ -241,21 +230,24 @@ drawin_refresh_pixmap_partial(drawin_t *drawin,
                               int16_t x, int16_t y,
                               uint16_t w, uint16_t h)
 {
+    if (!drawin->visible)
+        return;
+
     /* Make cairo do all pending drawing */
-    cairo_surface_flush(drawin->surface);
+    cairo_surface_flush(drawin->drawable->surface);
     xcb_copy_area(globalconf.connection, drawin->pixmap,
                   drawin->window, globalconf.gc, x, y, x, y,
                   w, h);
 }
 
 static void
-drawin_map(drawin_t *drawin)
+drawin_map(drawin_t *drawin, int widx)
 {
     /* Activate BMA */
     client_ignore_enterleave_events();
     /* Map the drawin */
     xcb_map_window(globalconf.connection, drawin->window);
-    drawin_update_drawing(drawin);
+    drawin_update_drawing(drawin, widx);
     /* Deactivate BMA */
     client_restore_enterleave_events();
     /* Stack this drawin correctly */
@@ -304,7 +296,7 @@ drawin_set_visible(lua_State *L, int udx, bool v)
 
         if(drawin->visible)
         {
-            drawin_map(drawin);
+            drawin_map(drawin, udx);
             /* duplicate drawin */
             lua_pushvalue(L, udx);
             /* ref it */
@@ -345,6 +337,9 @@ drawin_allocator(lua_State *L)
     w->geometry.height = 1;
     w->type = _NET_WM_WINDOW_TYPE_NORMAL;
 
+    drawable_allocator(L, NULL, (drawable_refresh_callback *) drawin_refresh_pixmap, w);
+    w->drawable = luaA_object_ref_item(L, -2, -1);
+
     drawin_init(w);
 
     return w;
@@ -524,33 +519,18 @@ luaA_drawin_set_visible(lua_State *L, drawin_t *drawin)
     return 0;
 }
 
-/** Get a drawin's surface
+/** Get a drawin's drawable
  * \param L The Lua VM state.
  * \param drawin The drawin object.
  * \return The number of elements pushed on stack.
  */
 static int
-luaA_drawin_get_surface(lua_State *L, drawin_t *drawin)
+luaA_drawin_get_drawable(lua_State *L, drawin_t *drawin)
 {
-    /* Lua gets its own reference which it will have to destroy */
-    lua_pushlightuserdata(L, cairo_surface_reference(drawin->surface));
+    luaA_object_push_item(L, -2, drawin->drawable);
     return 1;
 }
 
-/** Refresh a drawin's content. This has to be called whenever some drawing to
- * the drawin's surface has been done and should become visible.
- * \param L The Lua VM state.
- * \return The number of elements pushed on stack.
- */
-static int
-luaA_drawin_refresh(lua_State *L)
-{
-    drawin_t *drawin = luaA_checkudata(L, 1, &drawin_class);
-    drawin_refresh_pixmap(drawin);
-
-    return 0;
-}
-
 void
 drawin_class_setup(lua_State *L)
 {
@@ -566,7 +546,6 @@ drawin_class_setup(lua_State *L)
         LUA_OBJECT_META(drawin)
         LUA_CLASS_META
         { "geometry", luaA_drawin_geometry },
-        { "refresh", luaA_drawin_refresh },
         { NULL, NULL },
     };
 
@@ -576,9 +555,9 @@ drawin_class_setup(lua_State *L)
                      NULL,
                      luaA_class_index_miss_property, luaA_class_newindex_miss_property,
                      drawin_methods, drawin_meta);
-    luaA_class_add_property(&drawin_class, "surface",
+    luaA_class_add_property(&drawin_class, "drawable",
                             NULL,
-                            (lua_class_propfunc_t) luaA_drawin_get_surface,
+                            (lua_class_propfunc_t) luaA_drawin_get_drawable,
                             NULL);
     luaA_class_add_property(&drawin_class, "visible",
                             (lua_class_propfunc_t) luaA_drawin_set_visible,

objects/drawin.h

@@ -25,6 +25,7 @@
 
 #include "objects/window.h"
 #include "common/luaobject.h"
+#include "objects/drawable.h"
 #include "draw.h"
 
 /** Drawin type */
@@ -37,10 +38,10 @@ struct drawin_t
     bool visible;
     /** Cursor */
     char *cursor;
-    /** The pixmap copied to the window object. */
+    /** The pixmap for double buffering. */
     xcb_pixmap_t pixmap;
-    /** Surface for drawing to the pixmap. */
-    cairo_surface_t *surface;
+    /** The drawable for this drawin. */
+    drawable_t *drawable;
     /** The window geometry. */
     area_t geometry;
 };