/* * drawable.c - drawable functions * * Copyright © 2008-2009 Julien Danjou * Copyright © 2010-2012 Uli Schlachter * * 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. * */ /** Low-level API to allow Cairo to draw on clients and wiboxes. * * @author Uli Schlachter <psychon@znc.in> * @copyright 2012 Uli Schlachter * @coreclassmod drawable */ #include "drawable.h" #include "common/luaobject.h" #include "globalconf.h" #include /** Drawable object. * * @property surface The drawable's cairo surface. * @tparam gears.surface surface */ /** * @signal button::press */ /** * @signal button::release */ /** * @signal mouse::enter */ /** * @signal mouse::leave */ /** * @signal mouse::move */ /** * @signal property::geometry */ /** * @signal property::height */ /** * @signal property::width */ /** * @signal property::x */ /** * @signal property::y */ /** * @signal property::surface */ /** Get the number of instances. * * @return The number of drawable objects alive. * @staticfct instances */ /* Set a __index metamethod for all drawable instances. * @tparam function cb The meta-method * @staticfct set_index_miss_handler */ /* Set a __newindex metamethod for all drawable instances. * @tparam function cb The meta-method * @staticfct set_newindex_miss_handler */ static lua_class_t drawable_class; LUA_OBJECT_FUNCS(drawable_class, drawable_t, drawable) drawable_t * drawable_allocator(lua_State *L, drawable_refresh_callback *callback, void *data) { drawable_t *d = drawable_new(L); d->refresh_callback = callback; d->refresh_data = data; d->refreshed = false; d->surface = NULL; d->pixmap = XCB_NONE; return d; } static void drawable_unset_surface(drawable_t *d) { cairo_surface_finish(d->surface); cairo_surface_destroy(d->surface); if (d->pixmap) xcb_free_pixmap(globalconf.connection, d->pixmap); d->refreshed = false; d->surface = NULL; d->pixmap = XCB_NONE; } static void drawable_wipe(drawable_t *d) { drawable_unset_surface(d); } void drawable_set_geometry(lua_State *L, int didx, area_t geom) { drawable_t *d = luaA_checkudata(L, didx, &drawable_class); area_t old = d->geometry; d->geometry = geom; bool size_changed = (old.width != geom.width) || (old.height != geom.height); if (size_changed) drawable_unset_surface(d); if (size_changed && geom.width > 0 && geom.height > 0) { d->pixmap = xcb_generate_id(globalconf.connection); xcb_create_pixmap(globalconf.connection, globalconf.default_depth, d->pixmap, globalconf.screen->root, geom.width, geom.height); d->surface = cairo_xcb_surface_create(globalconf.connection, d->pixmap, globalconf.visual, geom.width, geom.height); luaA_object_emit_signal(L, didx, "property::surface", 0); } if (!AREA_EQUAL(old, geom)) luaA_object_emit_signal(L, didx, "property::geometry", 0); if (old.x != geom.x) luaA_object_emit_signal(L, didx, "property::x", 0); if (old.y != geom.y) luaA_object_emit_signal(L, didx, "property::y", 0); if (old.width != geom.width) luaA_object_emit_signal(L, didx, "property::width", 0); if (old.height != geom.height) luaA_object_emit_signal(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) { if (drawable->surface) /* Lua gets its own reference which it will have to destroy */ lua_pushlightuserdata(L, cairo_surface_reference(drawable->surface)); else lua_pushnil(L); 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. * * @method refresh * @noreturn */ static int luaA_drawable_refresh(lua_State *L) { drawable_t *drawable = luaA_checkudata(L, 1, &drawable_class); drawable->refreshed = true; (*drawable->refresh_callback)(drawable->refresh_data); return 0; } /** Get drawable geometry. The geometry consists of x, y, width and height. * * @treturn table A table with drawable coordinates and geometry. * @method geometry */ 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); } /* @DOC_cobject_COMMON@ */ // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80