1 /*
2 * This file is part of darktable,
3 * Copyright (C) 2015-2020 darktable developers.
4 *
5 * darktable is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
9 *
10 * darktable is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with darktable. If not, see <http://www.gnu.org/licenses/>.
17 */
18 #include "gui/guides.h"
19 #include "common/darktable.h"
20 #include "lua/cairo.h"
21 #include "lua/call.h"
22 #include "lua/lua.h"
23 #include "lua/widget/widget.h"
24
25 typedef struct callback_data_t
26 {
27 int draw_callback_id;
28 int gui_callback_id;
29 } callback_data_t;
30
_guides_draw_callback(cairo_t * cr,const float x,const float y,const float w,const float h,const float zoom_scale,void * user_data)31 static void _guides_draw_callback(cairo_t *cr, const float x, const float y,
32 const float w, const float h,
33 const float zoom_scale, void *user_data)
34 {
35 callback_data_t *d = (callback_data_t *)user_data;
36
37 dt_lua_lock_silent(); // this code is called from the C side so we have to lock
38
39 lua_State *L = darktable.lua_state.state;
40 lua_rawgeti(L, LUA_REGISTRYINDEX, d->draw_callback_id);
41
42 luaA_push(L, dt_lua_cairo_t, &cr);
43 lua_pushnumber(L, x);
44 lua_pushnumber(L, y);
45 lua_pushnumber(L, w);
46 lua_pushnumber(L, h);
47 lua_pushnumber(L, zoom_scale);
48
49 // this will be called directly from the gui thread so we can just execute it, without caring about the gtk lock
50 dt_lua_treated_pcall(L,6,0);
51
52 dt_lua_type_gpointer_drop(L,cr);
53
54 dt_lua_unlock();
55 }
56
_guides_gui_callback(dt_iop_module_t * self,void * user_data)57 static GtkWidget *_guides_gui_callback(dt_iop_module_t *self, void *user_data)
58 {
59 callback_data_t *d = (callback_data_t *)user_data;
60 dt_lua_lock_silent(); // this code is called from the C side so we have to lock
61 lua_State *L = darktable.lua_state.state;
62 lua_rawgeti(L, LUA_REGISTRYINDEX, d->gui_callback_id);
63 dt_lua_treated_pcall(L,0,1);
64
65 // dt_lua_debug_stack(L);
66 lua_widget widget;
67 luaA_to(L, lua_widget, &widget, -1);
68 dt_lua_widget_bind(L, widget);
69 lua_pop(L,1);
70
71 dt_lua_unlock();
72
73 return widget->widget;
74 }
75
register_guide(lua_State * L)76 static int register_guide(lua_State *L)
77 {
78 int draw_callback_id = -1, gui_callback_id = -1;
79 dt_guides_widget_callback gui_callback = NULL;
80
81 lua_settop(L, 3);
82
83 const char *name = luaL_checkstring(L, 1);
84
85 if(!lua_isnil(L, 3))
86 {
87 luaL_checktype(L, 3, LUA_TFUNCTION);
88 gui_callback = _guides_gui_callback;
89 gui_callback_id = luaL_ref(L, LUA_REGISTRYINDEX);
90 }
91 else
92 lua_pop(L, 1); // get rid of the nil
93
94 if(lua_isnil(L, 2))
95 return luaL_error(L, "missing draw callback");
96
97 luaL_checktype(L, 2, LUA_TFUNCTION);
98 draw_callback_id = luaL_ref(L, LUA_REGISTRYINDEX);
99
100 callback_data_t *user_data = (callback_data_t *)malloc(sizeof(callback_data_t));
101 user_data->draw_callback_id = draw_callback_id;
102 user_data->gui_callback_id = gui_callback_id;
103
104 dt_guides_add_guide(name, _guides_draw_callback, gui_callback, user_data, free);
105 return 0;
106 }
107
dt_lua_init_guides(lua_State * L)108 int dt_lua_init_guides(lua_State *L)
109 {
110 dt_lua_push_darktable_lib(L);
111
112 dt_lua_goto_subtable(L, "guides");
113 // build the table containing the guides
114
115 lua_pushstring(L, "register_guide");
116 lua_pushcfunction(L, register_guide);
117 lua_settable(L, -3);
118
119 lua_pop(L, 1); // remove the configuration table from the stack
120 return 0;
121 }
122
123
124
125 // modelines: These editor modelines have been set for all relevant files by tools/update_modelines.sh
126 // vim: shiftwidth=2 expandtab tabstop=2 cindent
127 // kate: tab-indents: off; indent-width 2; replace-tabs on; indent-mode cstyle; remove-trailing-spaces modified;
128