1 files changed, 659 insertions, 0 deletions

diff --git a/libraries/ecore/src/lib/ecore_evas/ecore_evas_fb.c b/libraries/ecore/src/lib/ecore_evas/ecore_evas_fb.c
new file mode 100644
index 0000000..3ee913e
--- /dev/null
+++ b/libraries/ecore/src/lib/ecore_evas/ecore_evas_fb.c
@@ -0,0 +1,659 @@
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <sys/types.h>
+#include <dirent.h>
+
+#include <Ecore.h>
+#include "ecore_private.h"
+#ifdef BUILD_ECORE_EVAS_FB
+#include <Ecore_Fb.h>
+#include <ecore_fb_private.h>
+#endif
+
+#include "ecore_evas_private.h"
+#include "Ecore_Evas.h"
+
+#ifdef BUILD_ECORE_EVAS_FB
+static int _ecore_evas_init_count = 0;
+
+static char *ecore_evas_default_display = "0";
+static Eina_List *ecore_evas_input_devices = NULL;
+static Ecore_Event_Handler *ecore_evas_event_handlers[4] = {NULL, NULL, NULL, NULL};
+
+static void
+_ecore_evas_mouse_move_process_fb(Ecore_Evas *ee, int x, int y)
+{
+   int fbw, fbh;
+
+   ee->mouse.x = x;
+   ee->mouse.y = y;
+   ecore_fb_size_get(&fbw, &fbh);
+   if (ee->prop.cursor.object)
+     {
+        evas_object_show(ee->prop.cursor.object);
+        if (ee->rotation == 0)
+          evas_object_move(ee->prop.cursor.object,
+                           x - ee->prop.cursor.hot.x,
+                           y - ee->prop.cursor.hot.y);
+        else if (ee->rotation == 90)
+          evas_object_move(ee->prop.cursor.object,
+                           (fbh - ee->h) + ee->h - y - 1 - ee->prop.cursor.hot.x,
+                           x - ee->prop.cursor.hot.y);
+        else if (ee->rotation == 180)
+          evas_object_move(ee->prop.cursor.object,
+                           (fbw - ee->w) + ee->w - x - 1 - ee->prop.cursor.hot.x,
+                           (fbh - ee->h) + ee->h - y - 1 - ee->prop.cursor.hot.y);
+        else if (ee->rotation == 270)
+          evas_object_move(ee->prop.cursor.object,
+                           y - ee->prop.cursor.hot.x,
+                           (fbw - ee->w) + ee->w - x - 1 - ee->prop.cursor.hot.y);
+     }
+}
+
+static Ecore_Evas *fb_ee = NULL;
+
+static Ecore_Evas *
+_ecore_evas_fb_match(void)
+{
+   return fb_ee;
+}
+
+static void
+_ecore_evas_fb_lose(void *data __UNUSED__)
+{
+   Eina_List *ll;
+   Ecore_Fb_Input_Device *dev;
+
+   if (fb_ee) fb_ee->visible = 0;
+
+   EINA_LIST_FOREACH(ecore_evas_input_devices, ll, dev)
+     ecore_fb_input_device_listen(dev, 0);
+}
+
+static void
+_ecore_evas_fb_gain(void *data __UNUSED__)
+{
+   Ecore_Evas *ee;
+   Eina_List *ll;
+   Ecore_Fb_Input_Device *dev;
+
+   if (fb_ee)
+     {
+        ee = fb_ee;
+
+        ee->visible = 1;
+        if ((ee->rotation == 90) || (ee->rotation == 270))
+          evas_damage_rectangle_add(ee->evas, 0, 0, ee->h, ee->w);
+        else
+          evas_damage_rectangle_add(ee->evas, 0, 0, ee->w, ee->h);
+     }
+
+   EINA_LIST_FOREACH(ecore_evas_input_devices, ll, dev)
+     ecore_fb_input_device_listen(dev, 1);
+}
+
+static Eina_Bool
+_ecore_evas_event_mouse_button_down(void *data __UNUSED__, int type __UNUSED__, void *event)
+{
+   Ecore_Evas *ee;
+   Ecore_Event_Mouse_Button *e;
+
+   e = event;
+   ee = _ecore_evas_fb_match();
+   if (!ee) return ECORE_CALLBACK_PASS_ON;
+   _ecore_evas_mouse_move_process_fb(ee, e->x, e->y);
+   return ECORE_CALLBACK_PASS_ON;
+}
+
+static Eina_Bool
+_ecore_evas_event_mouse_button_up(void *data __UNUSED__, int type __UNUSED__, void *event)
+{
+   Ecore_Evas *ee;
+   Ecore_Event_Mouse_Button *e;
+
+   e = event;
+   ee = _ecore_evas_fb_match();
+   if (!ee) return ECORE_CALLBACK_PASS_ON;
+   _ecore_evas_mouse_move_process_fb(ee, e->x, e->y);
+   return ECORE_CALLBACK_PASS_ON;
+}
+
+static Eina_Bool
+_ecore_evas_event_mouse_move(void *data __UNUSED__, int type __UNUSED__, void *event)
+{
+   Ecore_Evas *ee;
+   Ecore_Event_Mouse_Move *e;
+
+   e = event;
+   ee = _ecore_evas_fb_match();
+   if (!ee) return ECORE_CALLBACK_PASS_ON;
+   _ecore_evas_mouse_move_process_fb(ee, e->x, e->y);
+   return ECORE_CALLBACK_PASS_ON;
+}
+
+static Eina_Bool
+_ecore_evas_event_mouse_wheel(void *data __UNUSED__, int type __UNUSED__, void *event)
+{
+   Ecore_Evas *ee;
+   Ecore_Event_Mouse_Wheel *e;
+
+   e = event;
+   ee = _ecore_evas_fb_match();
+   if (!ee) return ECORE_CALLBACK_PASS_ON;
+   _ecore_evas_mouse_move_process_fb(ee, e->x, e->y);
+   return ECORE_CALLBACK_PASS_ON;
+}
+
+static int
+_ecore_evas_fb_render(Ecore_Evas *ee)
+{
+   int rend = 0;
+
+   if (ee->visible)
+     {
+        Eina_List *updates;
+
+        Eina_List *ll;
+        Ecore_Evas *ee2;
+        if (ee->func.fn_pre_render) ee->func.fn_pre_render(ee);
+
+        EINA_LIST_FOREACH(ee->sub_ecore_evas, ll, ee2)
+          {
+             if (ee2->func.fn_pre_render) ee2->func.fn_pre_render(ee2);
+             if (ee2->engine.func->fn_render)
+               rend |= ee2->engine.func->fn_render(ee2);
+             if (ee2->func.fn_post_render) ee2->func.fn_post_render(ee2);
+          }
+
+        updates = evas_render_updates(ee->evas);
+        if (updates)
+          {
+             evas_render_updates_free(updates);
+             _ecore_evas_idle_timeout_update(ee);
+             rend = 1;
+          }
+        if (ee->func.fn_post_render) ee->func.fn_post_render(ee);
+     }
+   else
+     evas_norender(ee->evas);
+   return rend;
+}
+
+static int
+_ecore_evas_fb_init(Ecore_Evas *ee, int w, int h)
+{
+   Ecore_Fb_Input_Device *device;
+   Ecore_Fb_Input_Device_Cap caps;
+   int mouse_handled = 0;
+
+   DIR *input_dir;
+   struct dirent *input_entry;
+
+   _ecore_evas_init_count++;
+   if (_ecore_evas_init_count > 1) return _ecore_evas_init_count;
+
+   ecore_event_evas_init();
+
+   /* register all input devices */
+   input_dir = opendir("/dev/input/");
+   if (!input_dir) return _ecore_evas_init_count;
+
+   while ((input_entry = readdir(input_dir)))
+     {
+        char device_path[256];
+
+        if (strncmp(input_entry->d_name, "event", 5) != 0)
+          continue;
+
+        snprintf(device_path, 256, "/dev/input/%s", input_entry->d_name);
+        if (!(device = ecore_fb_input_device_open(device_path)))
+          continue;
+        ecore_fb_input_device_window_set(device, ee);
+
+        caps = ecore_fb_input_device_cap_get(device);
+
+        /* Mouse */
+#ifdef HAVE_TSLIB
+        if (caps & ECORE_FB_INPUT_DEVICE_CAP_RELATIVE)
+#else
+        if ((caps & ECORE_FB_INPUT_DEVICE_CAP_RELATIVE) || (caps & ECORE_FB_INPUT_DEVICE_CAP_ABSOLUTE))
+#endif
+          {
+             ecore_fb_input_device_axis_size_set(device, w, h);
+             ecore_fb_input_device_listen(device,1);
+             ecore_evas_input_devices = eina_list_append(ecore_evas_input_devices, device);
+             if (!mouse_handled)
+               {
+                  ecore_evas_event_handlers[0]  = ecore_event_handler_add(ECORE_EVENT_MOUSE_BUTTON_DOWN, _ecore_evas_event_mouse_button_down, NULL);
+                  ecore_evas_event_handlers[1]  = ecore_event_handler_add(ECORE_EVENT_MOUSE_BUTTON_UP, _ecore_evas_event_mouse_button_up, NULL);
+                  ecore_evas_event_handlers[2]  = ecore_event_handler_add(ECORE_EVENT_MOUSE_MOVE, _ecore_evas_event_mouse_move, NULL);
+                  ecore_evas_event_handlers[3]  = ecore_event_handler_add(ECORE_EVENT_MOUSE_WHEEL, _ecore_evas_event_mouse_wheel, NULL);
+                  mouse_handled = 1;
+               }
+          }
+        /* Keyboard */
+        else if ((caps & ECORE_FB_INPUT_DEVICE_CAP_KEYS_OR_BUTTONS) && !(caps & ECORE_FB_INPUT_DEVICE_CAP_ABSOLUTE))
+          {
+             ecore_fb_input_device_listen(device,1);
+             ecore_evas_input_devices = eina_list_append(ecore_evas_input_devices, device);
+          }
+     }
+   closedir(input_dir);
+
+   if (!mouse_handled)
+     {
+        if (ecore_fb_ts_init())
+          {
+             ecore_fb_ts_event_window_set(ee);
+             ecore_evas_event_handlers[0]  = ecore_event_handler_add(ECORE_EVENT_MOUSE_BUTTON_DOWN, _ecore_evas_event_mouse_button_down, NULL);
+             ecore_evas_event_handlers[1]  = ecore_event_handler_add(ECORE_EVENT_MOUSE_BUTTON_UP, _ecore_evas_event_mouse_button_up, NULL);
+             ecore_evas_event_handlers[2]  = ecore_event_handler_add(ECORE_EVENT_MOUSE_MOVE, _ecore_evas_event_mouse_move, NULL);
+             mouse_handled = 1;
+          }
+     }
+   return _ecore_evas_init_count;
+}
+
+static void
+_ecore_evas_fb_free(Ecore_Evas *ee)
+{
+   ecore_evas_input_event_unregister(ee);
+   if (fb_ee == ee) fb_ee = NULL;
+   _ecore_evas_fb_shutdown();
+   ecore_fb_shutdown();
+}
+
+static void
+_ecore_evas_resize(Ecore_Evas *ee, int w, int h)
+{
+   ee->req.w = w;
+   ee->req.h = h;
+   if ((w == ee->w) && (h == ee->h)) return;
+   ee->w = w;
+   ee->h = h;
+   if ((ee->rotation == 90) || (ee->rotation == 270))
+     {
+       evas_output_size_set(ee->evas, ee->h, ee->w);
+       evas_output_viewport_set(ee->evas, 0, 0, ee->h, ee->w);
+       evas_damage_rectangle_add(ee->evas, 0, 0, ee->h, ee->w);
+     }
+   else
+     {
+       evas_output_size_set(ee->evas, ee->w, ee->h);
+       evas_output_viewport_set(ee->evas, 0, 0, ee->w, ee->h);
+       evas_damage_rectangle_add(ee->evas, 0, 0, ee->w, ee->h);
+     }
+   if (ee->func.fn_resize) ee->func.fn_resize(ee);
+}
+
+static void
+_ecore_evas_move_resize(Ecore_Evas *ee, int x __UNUSED__, int y __UNUSED__, int w, int h)
+{
+   ee->req.w = w;
+   ee->req.h = h;
+   if ((w == ee->w) && (h == ee->h)) return;
+   ee->w = w;
+   ee->h = h;
+   if ((ee->rotation == 90) || (ee->rotation == 270))
+     {
+       evas_output_size_set(ee->evas, ee->h, ee->w);
+       evas_output_viewport_set(ee->evas, 0, 0, ee->h, ee->w);
+       evas_damage_rectangle_add(ee->evas, 0, 0, ee->h, ee->w);
+     }
+   else
+     {
+       evas_output_size_set(ee->evas, ee->w, ee->h);
+       evas_output_viewport_set(ee->evas, 0, 0, ee->w, ee->h);
+       evas_damage_rectangle_add(ee->evas, 0, 0, ee->w, ee->h);
+     }
+   if (ee->func.fn_resize) ee->func.fn_resize(ee);
+}
+
+static void
+_ecore_evas_rotation_set(Ecore_Evas *ee, int rotation, int resize __UNUSED__)
+{
+   Evas_Engine_Info_FB *einfo;
+   int rot_dif;
+
+   if (ee->rotation == rotation) return;
+   einfo = (Evas_Engine_Info_FB *)evas_engine_info_get(ee->evas);
+   if (!einfo) return;
+   rot_dif = ee->rotation - rotation;
+   if (rot_dif < 0) rot_dif = -rot_dif;
+   if (rot_dif != 180)
+     {
+
+        einfo->info.rotation = rotation;
+        if (!evas_engine_info_set(ee->evas, (Evas_Engine_Info *)einfo))
+          {
+             ERR("evas_engine_info_set() for engine '%s' failed.", ee->driver);
+          }
+        if (!ee->prop.fullscreen)
+          {
+             int tmp;
+
+             tmp = ee->w;
+             ee->w = ee->h;
+             ee->h = tmp;
+             ee->req.w = ee->w;
+             ee->req.h = ee->h;
+          }
+        else
+          {
+             if ((rotation == 0) || (rotation == 180))
+               {
+                  evas_output_size_set(ee->evas, ee->w, ee->h);
+                  evas_output_viewport_set(ee->evas, 0, 0, ee->w, ee->h);
+               }
+             else
+               {
+                  evas_output_size_set(ee->evas, ee->h, ee->w);
+                  evas_output_viewport_set(ee->evas, 0, 0, ee->h, ee->w);
+               }
+          }
+        ee->rotation = rotation;
+     }
+   else
+     {
+        einfo->info.rotation = rotation;
+        if (!evas_engine_info_set(ee->evas, (Evas_Engine_Info *)einfo))
+          {
+             ERR("evas_engine_info_set() for engine '%s' failed.", ee->driver);
+          }
+        ee->rotation = rotation;
+     }
+   if ((ee->rotation == 90) || (ee->rotation == 270))
+     evas_damage_rectangle_add(ee->evas, 0, 0, ee->h, ee->w);
+   else
+     evas_damage_rectangle_add(ee->evas, 0, 0, ee->w, ee->h);
+   _ecore_evas_mouse_move_process_fb(ee, ee->mouse.x, ee->mouse.y);
+   if (ee->func.fn_resize) ee->func.fn_resize(ee);
+}
+
+static void
+_ecore_evas_show(Ecore_Evas *ee)
+{
+   if (ee->prop.focused) return;
+   ee->prop.focused = 1;
+   evas_focus_in(ee->evas);
+   if (ee->func.fn_focus_in) ee->func.fn_focus_in(ee);
+}
+
+static void
+_ecore_evas_object_cursor_del(void *data, Evas *e __UNUSED__, Evas_Object *obj __UNUSED__, void *event_info __UNUSED__)
+{
+   Ecore_Evas *ee;
+
+   ee = data;
+   if (ee)
+     ee->prop.cursor.object = NULL;
+}
+
+static void
+_ecore_evas_object_cursor_set(Ecore_Evas *ee, Evas_Object *obj, int layer, int hot_x, int hot_y)
+{
+   int x, y;
+
+   if (ee->prop.cursor.object) evas_object_del(ee->prop.cursor.object);
+
+   if (!obj)
+     {
+        ee->prop.cursor.object = NULL;
+        ee->prop.cursor.layer = 0;
+        ee->prop.cursor.hot.x = 0;
+        ee->prop.cursor.hot.y = 0;
+        return;
+     }
+
+   ee->prop.cursor.object = obj;
+   ee->prop.cursor.layer = layer;
+   ee->prop.cursor.hot.x = hot_x;
+   ee->prop.cursor.hot.y = hot_y;
+   evas_pointer_output_xy_get(ee->evas, &x, &y);
+   evas_object_layer_set(ee->prop.cursor.object, ee->prop.cursor.layer);
+   evas_object_move(ee->prop.cursor.object,
+                    x - ee->prop.cursor.hot.x,
+                    y - ee->prop.cursor.hot.y);
+   evas_object_pass_events_set(ee->prop.cursor.object, 1);
+   if (evas_pointer_inside_get(ee->evas))
+     evas_object_show(ee->prop.cursor.object);
+
+   evas_object_event_callback_add(obj, EVAS_CALLBACK_DEL, _ecore_evas_object_cursor_del, ee);
+}
+
+static void
+_ecore_evas_fullscreen_set(Ecore_Evas *ee, int on)
+{
+   Eina_List *l;
+   Ecore_Fb_Input_Device *dev;
+   int resized = 0;
+
+   if (((ee->prop.fullscreen) && (on)) ||
+       ((!ee->prop.fullscreen) && (!on))) return;
+   if (on)
+     {
+        int w, h;
+
+        ee->engine.fb.real_w = ee->w;
+        ee->engine.fb.real_h = ee->h;
+        w = ee->w;
+        h = ee->h;
+        ecore_fb_size_get(&w, &h);
+        if ((w == 0) && (h == 0))
+          {
+             w = ee->w;
+             h = ee->h;
+          }
+        if ((w != ee->w) || (h != ee->h)) resized = 1;
+        ee->w = w;
+        ee->h = h;
+        ee->req.w = ee->w;
+        ee->req.h = ee->h;
+        evas_output_size_set(ee->evas, ee->w, ee->h);
+        evas_output_viewport_set(ee->evas, 0, 0, ee->w, ee->h);
+        evas_damage_rectangle_add(ee->evas, 0, 0, ee->w, ee->h);
+     }
+   else
+     {
+        if ((ee->engine.fb.real_w != ee->w) || (ee->engine.fb.real_h != ee->h)) resized = 1;
+        ee->w = ee->engine.fb.real_w;
+        ee->h = ee->engine.fb.real_h;
+        ee->req.w = ee->w;
+        ee->req.h = ee->h;
+        evas_output_size_set(ee->evas, ee->w, ee->h);
+        evas_output_viewport_set(ee->evas, 0, 0, ee->w, ee->h);
+        evas_damage_rectangle_add(ee->evas, 0, 0, ee->w, ee->h);
+     }
+   ee->prop.fullscreen = on;
+   EINA_LIST_FOREACH(ecore_evas_input_devices, l, dev)
+     ecore_fb_input_device_axis_size_set(dev, ee->w, ee->h);
+   /* rescale the input device area */
+   if (resized)
+     {
+        if (ee->func.fn_resize) ee->func.fn_resize(ee);
+     }
+}
+
+int
+_ecore_evas_fb_shutdown(void)
+{
+   _ecore_evas_init_count--;
+   if (_ecore_evas_init_count == 0)
+     {
+        int i;
+
+        for (i = 0; i < 4; i++)
+          {
+             if (ecore_evas_event_handlers[i])
+               ecore_event_handler_del(ecore_evas_event_handlers[i]);
+          }
+        ecore_fb_ts_shutdown();
+        ecore_event_evas_shutdown();
+     }
+   if (_ecore_evas_init_count < 0) _ecore_evas_init_count = 0;
+   return _ecore_evas_init_count;
+}
+
+static Ecore_Evas_Engine_Func _ecore_fb_engine_func =
+{
+   _ecore_evas_fb_free,
+     NULL,
+     NULL,
+     NULL,
+     NULL,
+     NULL,
+     NULL,
+     NULL,
+     NULL,
+     NULL,
+     NULL,
+     NULL,
+     NULL,
+     NULL,
+     NULL,
+     NULL,
+     NULL,
+     _ecore_evas_resize,
+     _ecore_evas_move_resize,
+     _ecore_evas_rotation_set,
+     NULL,
+     _ecore_evas_show,
+     NULL,
+     NULL,
+     NULL,
+     NULL,
+     NULL,
+     NULL,
+     NULL,
+     NULL,
+     NULL,
+     NULL,
+     _ecore_evas_object_cursor_set,
+     NULL,
+     NULL,
+     NULL,
+     NULL,
+     NULL,
+     NULL,
+     _ecore_evas_fullscreen_set,
+     NULL,
+     NULL,
+     NULL,
+     NULL,
+     NULL,
+     NULL, //transparent
+
+     NULL, // render
+     NULL  // screen_geometry_get
+};
+#endif
+
+/**
+ * To be documented.
+ *
+ * FIXME: To be fixed.
+ */
+#ifdef BUILD_ECORE_EVAS_FB
+EAPI Ecore_Evas *
+ecore_evas_fb_new(const char *disp_name, int rotation, int w, int h)
+{
+   Evas_Engine_Info_FB *einfo;
+   Ecore_Evas *ee;
+
+   int rmethod;
+
+   if (!disp_name)
+   disp_name = ecore_evas_default_display;
+
+   rmethod = evas_render_method_lookup("fb");
+   if (!rmethod) return NULL;
+
+   if (!ecore_fb_init(disp_name)) return NULL;
+   ecore_fb_callback_gain_set(_ecore_evas_fb_gain, NULL);
+   ecore_fb_callback_lose_set(_ecore_evas_fb_lose, NULL);
+   ee = calloc(1, sizeof(Ecore_Evas));
+   if (!ee) return NULL;
+
+   ECORE_MAGIC_SET(ee, ECORE_MAGIC_EVAS);
+
+   _ecore_evas_fb_init(ee, w, h);
+
+   ee->engine.func = (Ecore_Evas_Engine_Func *)&_ecore_fb_engine_func;
+
+   ee->driver = "fb";
+   if (disp_name) ee->name = strdup(disp_name);
+
+   if (w < 1) w = 1;
+   if (h < 1) h = 1;
+   ee->rotation = rotation;
+   ee->visible = 1;
+   ee->w = w;
+   ee->h = h;
+   ee->req.w = ee->w;
+   ee->req.h = ee->h;
+
+   ee->prop.max.w = 0;
+   ee->prop.max.h = 0;
+   ee->prop.layer = 0;
+   ee->prop.focused = 1;
+   ee->prop.borderless = 1;
+   ee->prop.override = 1;
+   ee->prop.maximized = 1;
+   ee->prop.fullscreen = 0;
+   ee->prop.withdrawn = 0;
+   ee->prop.sticky = 0;
+
+   /* init evas here */
+   ee->evas = evas_new();
+   evas_data_attach_set(ee->evas, ee);
+   evas_output_method_set(ee->evas, rmethod);
+
+   if ((rotation == 90) || (rotation == 270))
+     {
+       evas_output_size_set(ee->evas, h, w);
+       evas_output_viewport_set(ee->evas, 0, 0, h, w);
+     }
+   else
+     {
+       evas_output_size_set(ee->evas, w, h);
+       evas_output_viewport_set(ee->evas, 0, 0, w, h);
+     }
+
+   einfo = (Evas_Engine_Info_FB *)evas_engine_info_get(ee->evas);
+   if (einfo)
+     {
+        einfo->info.virtual_terminal = 0;
+        einfo->info.device_number = strtol(disp_name, NULL, 10);
+        einfo->info.refresh = 0;
+        einfo->info.rotation = ee->rotation;
+        if (!evas_engine_info_set(ee->evas, (Evas_Engine_Info *)einfo))
+          {
+             ERR("evas_engine_info_set() for engine '%s' failed.", ee->driver);
+             ecore_evas_free(ee);
+             return NULL;
+          }
+     }
+   else
+     {
+        ERR("evas_engine_info_set() init engine '%s' failed.", ee->driver);
+        ecore_evas_free(ee);
+        return NULL;
+     }
+
+   ecore_evas_input_event_register(ee);
+
+   ee->engine.func->fn_render = _ecore_evas_fb_render;
+   _ecore_evas_register(ee);
+   fb_ee = ee;
+   evas_event_feed_mouse_in(ee->evas, (unsigned int)((unsigned long long)(ecore_time_get() * 1000.0) & 0xffffffff), NULL);
+   return ee;
+}
+#else
+EAPI Ecore_Evas *
+ecore_evas_fb_new(const char *disp_name __UNUSED__, int rotation __UNUSED__, int w __UNUSED__, int h __UNUSED__)
+{
+   return NULL;
+}
+#endif