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mutter/clutter/clutter-main.c
Emmanuele Bassi d5ea422c8f stage: Maintain the motion event delivery invariants 
It is possible, by calling clutter_set_motion_events_enabled() prior to
the creation of any stage, to control the per-actor motion event
delivery flag on each newly created stage. Since we deprecated the
global accessor functions in favour of the per-Stage ones, we need to
remove the call to clutter_get_motion_events_enabled() inside the
ClutterStage instance initialization, and replace it with an internal
function.

This code will go away when we can finally break API and remove the
deprecated functions.
2011-06-20 13:53:09 +01:00

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Authored By Matthew Allum <mallum@openedhand.com>
*
* Copyright (C) 2006 OpenedHand
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*
*/
/**
* SECTION:clutter-main
* @short_description: Various 'global' clutter functions.
*
* Functions to retrieve various global Clutter resources and other utility
* functions for mainloops, events and threads
*
* <refsect2 id="clutter-Threading-Model">
* <title>Threading Model</title>
* <para>Clutter is <emphasis>thread-aware</emphasis>: all operations
* performed by Clutter are assumed to be under the big Clutter lock,
* which is created when the threading is initialized through
* clutter_threads_init().</para>
* <example id="example-Thread-Init">
* <title>Thread Initialization</title>
* <para>The code below shows how to correctly initialize Clutter
* in a multi-threaded environment. These operations are mandatory for
* applications that wish to use threads with Clutter.</para>
* <programlisting>
* int
* main (int argc, char *argv[])
* {
* /&ast; initialize GLib's threading support &ast;/
* g_thread_init (NULL);
*
* /&ast; initialize Clutter's threading support &ast;/
* clutter_threads_init ();
*
* /&ast; initialize Clutter &ast;/
* clutter_init (&amp;argc, &amp;argv);
*
* /&ast; program code &ast;/
*
* /&ast; acquire the main lock &ast;/
* clutter_threads_enter ();
*
* /&ast; start the main loop &ast;/
* clutter_main ();
*
* /&ast; release the main lock &ast;/
* clutter_threads_leave ();
*
* /&ast; clean up &ast;/
* return 0;
* }
* </programlisting>
* </example>
* <para>This threading model has the caveat that it is only safe to call
* Clutter's API when the lock has been acquired &mdash; which happens
* between pairs of clutter_threads_enter() and clutter_threads_leave()
* calls.</para>
* <para>The only safe and portable way to use the Clutter API in a
* multi-threaded environment is to never access the API from a thread that
* did not call clutter_init() and clutter_main().</para>
* <para>The common pattern for using threads with Clutter is to use worker
* threads to perform blocking operations and then install idle or timeour
* sources with the result when the thread finished.</para>
* <para>Clutter provides thread-aware variants of g_idle_add() and
* g_timeout_add() that acquire the Clutter lock before invoking the provided
* callback: clutter_threads_add_idle() and
* clutter_threads_add_timeout().</para>
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <glib/gi18n-lib.h>
#include <locale.h>
#include "clutter-actor.h"
#include "clutter-backend-private.h"
#include "clutter-debug.h"
#include "clutter-device-manager-private.h"
#include "clutter-event.h"
#include "clutter-feature.h"
#include "clutter-frame-source.h"
#include "clutter-main.h"
#include "clutter-master-clock.h"
#include "clutter-private.h"
#include "clutter-profile.h"
#include "clutter-stage-manager.h"
#include "clutter-stage-private.h"
#include "clutter-version.h" /* For flavour define */
#include <cogl/cogl.h>
#include <cogl-pango/cogl-pango.h>
#include "cally.h" /* For accessibility support */
/* main context */
static ClutterMainContext *ClutterCntx = NULL;
/* main lock and locking/unlocking functions */
static GMutex *clutter_threads_mutex = NULL;
static GCallback clutter_threads_lock = NULL;
static GCallback clutter_threads_unlock = NULL;
/* command line options */
static gboolean clutter_is_initialized = FALSE;
static gboolean clutter_show_fps = FALSE;
static gboolean clutter_fatal_warnings = FALSE;
static gboolean clutter_disable_mipmap_text = FALSE;
static gboolean clutter_use_fuzzy_picking = FALSE;
static gboolean clutter_enable_accessibility = TRUE;
static guint clutter_default_fps = 60;
static ClutterTextDirection clutter_text_direction = CLUTTER_TEXT_DIRECTION_LTR;
static guint clutter_main_loop_level = 0;
static GSList *main_loops = NULL;
guint clutter_debug_flags = 0; /* global clutter debug flag */
guint clutter_paint_debug_flags = 0;
guint clutter_pick_debug_flags = 0;
guint clutter_profile_flags = 0; /* global clutter profile flag */
const guint clutter_major_version = CLUTTER_MAJOR_VERSION;
const guint clutter_minor_version = CLUTTER_MINOR_VERSION;
const guint clutter_micro_version = CLUTTER_MICRO_VERSION;
#ifdef CLUTTER_ENABLE_DEBUG
static const GDebugKey clutter_debug_keys[] = {
{ "misc", CLUTTER_DEBUG_MISC },
{ "actor", CLUTTER_DEBUG_ACTOR },
{ "texture", CLUTTER_DEBUG_TEXTURE },
{ "event", CLUTTER_DEBUG_EVENT },
{ "paint", CLUTTER_DEBUG_PAINT },
{ "pick", CLUTTER_DEBUG_PICK },
{ "gl", CLUTTER_DEBUG_GL },
{ "alpha", CLUTTER_DEBUG_ALPHA },
{ "behaviour", CLUTTER_DEBUG_BEHAVIOUR },
{ "pango", CLUTTER_DEBUG_PANGO },
{ "backend", CLUTTER_DEBUG_BACKEND },
{ "scheduler", CLUTTER_DEBUG_SCHEDULER },
{ "script", CLUTTER_DEBUG_SCRIPT },
{ "shader", CLUTTER_DEBUG_SHADER },
{ "multistage", CLUTTER_DEBUG_MULTISTAGE },
{ "animation", CLUTTER_DEBUG_ANIMATION },
{ "layout", CLUTTER_DEBUG_LAYOUT },
{ "clipping", CLUTTER_DEBUG_CLIPPING }
};
#endif /* CLUTTER_ENABLE_DEBUG */
static const GDebugKey clutter_pick_debug_keys[] = {
{ "nop-picking", CLUTTER_DEBUG_NOP_PICKING },
{ "dump-pick-buffers", CLUTTER_DEBUG_DUMP_PICK_BUFFERS }
};
static const GDebugKey clutter_paint_debug_keys[] = {
{ "disable-swap-events", CLUTTER_DEBUG_DISABLE_SWAP_EVENTS },
{ "disable-clipped-redraws", CLUTTER_DEBUG_DISABLE_CLIPPED_REDRAWS },
{ "redraws", CLUTTER_DEBUG_REDRAWS },
{ "paint-volumes", CLUTTER_DEBUG_PAINT_VOLUMES },
{ "disable-culling", CLUTTER_DEBUG_DISABLE_CULLING },
{ "disable-offscreen-redirect", CLUTTER_DEBUG_DISABLE_OFFSCREEN_REDIRECT }
};
#ifdef CLUTTER_ENABLE_PROFILE
static const GDebugKey clutter_profile_keys[] = {
{"picking-only", CLUTTER_PROFILE_PICKING_ONLY },
{"disable-report", CLUTTER_PROFILE_DISABLE_REPORT }
};
#endif /* CLUTTER_ENABLE_DEBUG */
/**
* clutter_get_show_fps:
*
* Returns whether Clutter should print out the frames per second on the
* console. You can enable this setting either using the
* <literal>CLUTTER_SHOW_FPS</literal> environment variable or passing
* the <literal>--clutter-show-fps</literal> command line argument. *
*
* Return value: %TRUE if Clutter should show the FPS.
*
* Since: 0.4
*/
gboolean
clutter_get_show_fps (void)
{
return clutter_show_fps;
}
/**
* clutter_get_accessibility_enabled:
*
* Returns whether Clutter has accessibility support enabled. As
* least, a value of TRUE means that there are a proper AtkUtil
* implementation available
*
* Return value: %TRUE if Clutter has accessibility support enabled
*
* Since: 1.4
*/
gboolean
clutter_get_accessibility_enabled (void)
{
return cally_get_cally_initialized ();
}
/**
* clutter_redraw:
*
* Forces a redraw of the entire stage. Applications should never use this
* function, but queue a redraw using clutter_actor_queue_redraw().
*
* This function should only be used by libraries integrating Clutter from
* within another toolkit.
*/
void
clutter_redraw (ClutterStage *stage)
{
g_return_if_fail (CLUTTER_IS_STAGE (stage));
clutter_stage_ensure_redraw (stage);
}
/**
* clutter_set_motion_events_enabled:
* @enable: %TRUE to enable per-actor motion events
*
* Sets whether per-actor motion events should be enabled or not on
* all #ClutterStage<!-- -->s managed by Clutter.
*
* If @enable is %FALSE the following events will not work:
* <itemizedlist>
* <listitem><para>ClutterActor::motion-event, unless on the
* #ClutterStage</para></listitem>
* <listitem><para>ClutterActor::enter-event</para></listitem>
* <listitem><para>ClutterActor::leave-event</para></listitem>
* </itemizedlist>
*
* Since: 0.6
*
* Deprecated: 1.8: Use clutter_stage_set_motion_events_enabled() instead.
*/
void
clutter_set_motion_events_enabled (gboolean enable)
{
ClutterStageManager *stage_manager;
ClutterMainContext *context;
const GSList *l;
enable = !!enable;
context = _clutter_context_get_default ();
if (context->motion_events_per_actor == enable)
return;
/* store the flag for later query and for newly created stages */
context->motion_events_per_actor = enable;
/* propagate the change to all stages */
stage_manager = clutter_stage_manager_get_default ();
for (l = clutter_stage_manager_peek_stages (stage_manager);
l != NULL;
l = l->next)
{
clutter_stage_set_motion_events_enabled (l->data, enable);
}
}
/**
* clutter_get_motion_events_enabled:
*
* Gets whether the per-actor motion events are enabled.
*
* Return value: %TRUE if the motion events are enabled
*
* Since: 0.6
*
* Deprecated: 1.8: Use clutter_stage_get_motion_events_enabled() instead.
*/
gboolean
clutter_get_motion_events_enabled (void)
{
return _clutter_context_get_motion_events_enabled ();
}
ClutterActor *
_clutter_get_actor_by_id (ClutterStage *stage,
guint32 actor_id)
{
if (stage == NULL)
{
ClutterMainContext *context = _clutter_context_get_default ();
return _clutter_id_pool_lookup (context->id_pool, actor_id);
}
return _clutter_stage_get_actor_by_pick_id (stage, actor_id);
}
void
_clutter_id_to_color (guint id_,
ClutterColor *col)
{
ClutterMainContext *ctx;
gint red, green, blue;
ctx = _clutter_context_get_default ();
if (ctx->fb_g_mask == 0)
{
/* Figure out framebuffer masks used for pick */
cogl_get_bitmasks (&ctx->fb_r_mask,
&ctx->fb_g_mask,
&ctx->fb_b_mask, NULL);
ctx->fb_r_mask_used = ctx->fb_r_mask;
ctx->fb_g_mask_used = ctx->fb_g_mask;
ctx->fb_b_mask_used = ctx->fb_b_mask;
/* XXX - describe what "fuzzy picking" is */
if (clutter_use_fuzzy_picking)
{
ctx->fb_r_mask_used--;
ctx->fb_g_mask_used--;
ctx->fb_b_mask_used--;
}
}
/* compute the numbers we'll store in the components */
red = (id_ >> (ctx->fb_g_mask_used+ctx->fb_b_mask_used))
& (0xff >> (8-ctx->fb_r_mask_used));
green = (id_ >> ctx->fb_b_mask_used)
& (0xff >> (8-ctx->fb_g_mask_used));
blue = (id_)
& (0xff >> (8-ctx->fb_b_mask_used));
/* shift left bits a bit and add one, this circumvents
* at least some potential rounding errors in GL/GLES
* driver / hw implementation.
*/
if (ctx->fb_r_mask_used != ctx->fb_r_mask)
red = red * 2;
if (ctx->fb_g_mask_used != ctx->fb_g_mask)
green = green * 2;
if (ctx->fb_b_mask_used != ctx->fb_b_mask)
blue = blue * 2;
/* shift up to be full 8bit values */
red = (red << (8 - ctx->fb_r_mask)) | (0x7f >> (ctx->fb_r_mask_used));
green = (green << (8 - ctx->fb_g_mask)) | (0x7f >> (ctx->fb_g_mask_used));
blue = (blue << (8 - ctx->fb_b_mask)) | (0x7f >> (ctx->fb_b_mask_used));
col->red = red;
col->green = green;
col->blue = blue;
col->alpha = 0xff;
/* XXX: We rotate the nibbles of the colors here so that there is a
* visible variation between colors of sequential actor identifiers;
* otherwise pick buffers dumped to an image will pretty much just look
* black.
*/
if (G_UNLIKELY (clutter_pick_debug_flags & CLUTTER_DEBUG_DUMP_PICK_BUFFERS))
{
col->red = (col->red << 4) | (col->red >> 4);
col->green = (col->green << 4) | (col->green >> 4);
col->blue = (col->blue << 4) | (col->blue >> 4);
}
}
guint
_clutter_pixel_to_id (guchar pixel[4])
{
ClutterMainContext *ctx;
gint red, green, blue;
guint retval;
ctx = _clutter_context_get_default ();
/* reduce the pixel components to the number of bits actually used of the
* 8bits.
*/
if (G_UNLIKELY (clutter_pick_debug_flags & CLUTTER_DEBUG_DUMP_PICK_BUFFERS))
{
guchar tmp;
/* XXX: In _clutter_id_to_color we rotated the nibbles of the colors so
* that there is a visible variation between colors of sequential actor
* identifiers (otherwise pick buffers dumped to an image will pretty
* much just look black.) Here we reverse that rotation.
*/
tmp = ((pixel[0] << 4) | (pixel[0] >> 4));
red = tmp >> (8 - ctx->fb_r_mask);
tmp = ((pixel[1] << 4) | (pixel[1] >> 4));
green = tmp >> (8 - ctx->fb_g_mask);
tmp = ((pixel[2] << 4) | (pixel[2] >> 4));
blue = tmp >> (8 - ctx->fb_b_mask);
}
else
{
red = pixel[0] >> (8 - ctx->fb_r_mask);
green = pixel[1] >> (8 - ctx->fb_g_mask);
blue = pixel[2] >> (8 - ctx->fb_b_mask);
}
/* divide potentially by two if 'fuzzy' */
red = red >> (ctx->fb_r_mask - ctx->fb_r_mask_used);
green = green >> (ctx->fb_g_mask - ctx->fb_g_mask_used);
blue = blue >> (ctx->fb_b_mask - ctx->fb_b_mask_used);
/* combine the correct per component values into the final id */
retval = blue
+ (green << ctx->fb_b_mask_used)
+ (red << (ctx->fb_b_mask_used + ctx->fb_g_mask_used));
return retval;
}
static CoglPangoFontMap *
clutter_context_get_pango_fontmap (void)
{
ClutterMainContext *self;
CoglPangoFontMap *font_map;
gdouble resolution;
gboolean use_mipmapping;
self = _clutter_context_get_default ();
if (G_LIKELY (self->font_map != NULL))
return self->font_map;
font_map = COGL_PANGO_FONT_MAP (cogl_pango_font_map_new ());
resolution = clutter_backend_get_resolution (self->backend);
cogl_pango_font_map_set_resolution (font_map, resolution);
use_mipmapping = !clutter_disable_mipmap_text;
cogl_pango_font_map_set_use_mipmapping (font_map, use_mipmapping);
self->font_map = font_map;
return self->font_map;
}
static ClutterTextDirection
clutter_get_text_direction (void)
{
PangoDirection dir = PANGO_DIRECTION_LTR;
const gchar *direction;
direction = g_getenv ("CLUTTER_TEXT_DIRECTION");
if (direction && *direction != '\0')
{
if (strcmp (direction, "rtl") == 0)
dir = CLUTTER_TEXT_DIRECTION_RTL;
else if (strcmp (direction, "ltr") == 0)
dir = CLUTTER_TEXT_DIRECTION_LTR;
}
else
{
/* Translate to default:RTL if you want your widgets
* to be RTL, otherwise translate to default:LTR.
*
* Do *not* translate it to "predefinito:LTR": if it
* it isn't default:LTR or default:RTL it will not work
*/
char *e = _("default:LTR");
if (strcmp (e, "default:RTL") == 0)
dir = CLUTTER_TEXT_DIRECTION_RTL;
else if (strcmp (e, "default:LTR") == 0)
dir = CLUTTER_TEXT_DIRECTION_LTR;
else
g_warning ("Whoever translated default:LTR did so wrongly.");
}
return dir;
}
static void
update_pango_context (ClutterBackend *backend,
PangoContext *context)
{
ClutterSettings *settings;
PangoFontDescription *font_desc;
const cairo_font_options_t *font_options;
gchar *font_name;
PangoDirection pango_dir;
gdouble resolution;
settings = clutter_settings_get_default ();
/* update the text direction */
if (clutter_text_direction == CLUTTER_TEXT_DIRECTION_RTL)
pango_dir = PANGO_DIRECTION_RTL;
else
pango_dir = PANGO_DIRECTION_LTR;
pango_context_set_base_dir (context, pango_dir);
g_object_get (settings, "font-name", &font_name, NULL);
/* get the configuration for the PangoContext from the backend */
font_options = clutter_backend_get_font_options (backend);
resolution = clutter_backend_get_resolution (backend);
font_desc = pango_font_description_from_string (font_name);
if (resolution < 0)
resolution = 96.0; /* fall back */
pango_context_set_font_description (context, font_desc);
pango_cairo_context_set_font_options (context, font_options);
pango_cairo_context_set_resolution (context, resolution);
pango_font_description_free (font_desc);
g_free (font_name);
}
PangoContext *
_clutter_context_get_pango_context (void)
{
ClutterMainContext *self = _clutter_context_get_default ();
if (G_UNLIKELY (self->pango_context == NULL))
{
PangoContext *context;
context = _clutter_context_create_pango_context ();
self->pango_context = context;
g_signal_connect (self->backend, "resolution-changed",
G_CALLBACK (update_pango_context),
self->pango_context);
g_signal_connect (self->backend, "font-changed",
G_CALLBACK (update_pango_context),
self->pango_context);
}
else
update_pango_context (self->backend, self->pango_context);
return self->pango_context;
}
PangoContext *
_clutter_context_create_pango_context (void)
{
CoglPangoFontMap *font_map;
PangoContext *context;
font_map = clutter_context_get_pango_fontmap ();
context = cogl_pango_font_map_create_context (font_map);
update_pango_context (clutter_get_default_backend (), context);
pango_context_set_language (context, pango_language_get_default ());
return context;
}
/**
* clutter_main_quit:
*
* Terminates the Clutter mainloop.
*/
void
clutter_main_quit (void)
{
g_return_if_fail (main_loops != NULL);
g_main_loop_quit (main_loops->data);
}
/**
* clutter_main_level:
*
* Retrieves the depth of the Clutter mainloop.
*
* Return value: The level of the mainloop.
*/
gint
clutter_main_level (void)
{
return clutter_main_loop_level;
}
#ifdef CLUTTER_ENABLE_PROFILE
static gint (*prev_poll) (GPollFD *ufds, guint nfsd, gint timeout_) = NULL;
static gint
timed_poll (GPollFD *ufds,
guint nfsd,
gint timeout_)
{
gint ret;
CLUTTER_STATIC_TIMER (poll_timer,
"Mainloop", /* parent */
"Mainloop Idle",
"The time spent idle in poll()",
0 /* no application private data */);
CLUTTER_TIMER_START (uprof_get_mainloop_context (), poll_timer);
ret = prev_poll (ufds, nfsd, timeout_);
CLUTTER_TIMER_STOP (uprof_get_mainloop_context (), poll_timer);
return ret;
}
#endif
/**
* clutter_main:
*
* Starts the Clutter mainloop.
*/
void
clutter_main (void)
{
GMainLoop *loop;
CLUTTER_STATIC_TIMER (mainloop_timer,
NULL, /* no parent */
"Mainloop",
"The time spent in the clutter mainloop",
0 /* no application private data */);
if (clutter_main_loop_level == 0)
CLUTTER_TIMER_START (uprof_get_mainloop_context (), mainloop_timer);
if (!_clutter_context_is_initialized ())
{
g_warning ("Called clutter_main() but Clutter wasn't initialised. "
"You must call clutter_init() first.");
return;
}
CLUTTER_MARK ();
clutter_main_loop_level++;
#ifdef CLUTTER_ENABLE_PROFILE
if (!prev_poll)
{
prev_poll = g_main_context_get_poll_func (NULL);
g_main_context_set_poll_func (NULL, timed_poll);
}
#endif
loop = g_main_loop_new (NULL, TRUE);
main_loops = g_slist_prepend (main_loops, loop);
if (g_main_loop_is_running (main_loops->data))
{
clutter_threads_leave ();
g_main_loop_run (loop);
clutter_threads_enter ();
}
main_loops = g_slist_remove (main_loops, loop);
g_main_loop_unref (loop);
clutter_main_loop_level--;
CLUTTER_MARK ();
if (clutter_main_loop_level == 0)
CLUTTER_TIMER_STOP (uprof_get_mainloop_context (), mainloop_timer);
}
static void
clutter_threads_impl_lock (void)
{
if (G_LIKELY (clutter_threads_mutex != NULL))
g_mutex_lock (clutter_threads_mutex);
}
static void
clutter_threads_impl_unlock (void)
{
if (G_LIKELY (clutter_threads_mutex != NULL))
g_mutex_unlock (clutter_threads_mutex);
}
/**
* clutter_threads_init:
*
* Initialises the Clutter threading mechanism, so that Clutter API can be
* called by multiple threads, using clutter_threads_enter() and
* clutter_threads_leave() to mark the critical sections.
*
* You must call g_thread_init() before this function.
*
* This function must be called before clutter_init().
*
* It is safe to call this function multiple times.
*
* Since: 0.4
*/
void
clutter_threads_init (void)
{
if (!g_thread_supported ())
g_error ("g_thread_init() must be called before clutter_threads_init()");
if (clutter_threads_mutex != NULL)
return;
clutter_threads_mutex = g_mutex_new ();
if (!clutter_threads_lock)
clutter_threads_lock = clutter_threads_impl_lock;
if (!clutter_threads_unlock)
clutter_threads_unlock = clutter_threads_impl_unlock;
}
/**
* clutter_threads_set_lock_functions: (skip)
* @enter_fn: function called when aquiring the Clutter main lock
* @leave_fn: function called when releasing the Clutter main lock
*
* Allows the application to replace the standard method that
* Clutter uses to protect its data structures. Normally, Clutter
* creates a single #GMutex that is locked by clutter_threads_enter(),
* and released by clutter_threads_leave(); using this function an
* application provides, instead, a function @enter_fn that is
* called by clutter_threads_enter() and a function @leave_fn that is
* called by clutter_threads_leave().
*
* The functions must provide at least same locking functionality
* as the default implementation, but can also do extra application
* specific processing.
*
* As an example, consider an application that has its own recursive
* lock that when held, holds the Clutter lock as well. When Clutter
* unlocks the Clutter lock when entering a recursive main loop, the
* application must temporarily release its lock as well.
*
* Most threaded Clutter apps won't need to use this method.
*
* This method must be called before clutter_threads_init(), and cannot
* be called multiple times.
*
* Since: 0.4
*/
void
clutter_threads_set_lock_functions (GCallback enter_fn,
GCallback leave_fn)
{
g_return_if_fail (clutter_threads_lock == NULL &&
clutter_threads_unlock == NULL);
clutter_threads_lock = enter_fn;
clutter_threads_unlock = leave_fn;
}
gboolean
_clutter_threads_dispatch (gpointer data)
{
ClutterThreadsDispatch *dispatch = data;
gboolean ret = FALSE;
clutter_threads_enter ();
if (!g_source_is_destroyed (g_main_current_source ()))
ret = dispatch->func (dispatch->data);
clutter_threads_leave ();
return ret;
}
void
_clutter_threads_dispatch_free (gpointer data)
{
ClutterThreadsDispatch *dispatch = data;
/* XXX - we cannot hold the thread lock here because the main loop
* might destroy a source while still in the dispatcher function; so
* knowing whether the lock is being held or not is not known a priori.
*
* see bug: http://bugzilla.gnome.org/show_bug.cgi?id=459555
*/
if (dispatch->notify)
dispatch->notify (dispatch->data);
g_slice_free (ClutterThreadsDispatch, dispatch);
}
/**
* clutter_threads_add_idle_full:
* @priority: the priority of the timeout source. Typically this will be in the
* range between #G_PRIORITY_DEFAULT_IDLE and #G_PRIORITY_HIGH_IDLE
* @func: function to call
* @data: data to pass to the function
* @notify: functio to call when the idle source is removed
*
* Adds a function to be called whenever there are no higher priority
* events pending. If the function returns %FALSE it is automatically
* removed from the list of event sources and will not be called again.
*
* This function can be considered a thread-safe variant of g_idle_add_full():
* it will call @function while holding the Clutter lock. It is logically
* equivalent to the following implementation:
*
* |[
* static gboolean
* idle_safe_callback (gpointer data)
* {
* SafeClosure *closure = data;
* gboolean res = FALSE;
*
* /&ast; mark the critical section &ast;/
*
* clutter_threads_enter();
*
* /&ast; the callback does not need to acquire the Clutter
* &ast; lock itself, as it is held by the this proxy handler
* &ast;/
* res = closure->callback (closure->data);
*
* clutter_threads_leave();
*
* return res;
* }
* static gulong
* add_safe_idle (GSourceFunc callback,
* gpointer data)
* {
* SafeClosure *closure = g_new0 (SafeClosure, 1);
*
* closure-&gt;callback = callback;
* closure-&gt;data = data;
*
* return g_add_idle_full (G_PRIORITY_DEFAULT_IDLE,
* idle_safe_callback,
* closure,
* g_free)
* }
*]|
*
* This function should be used by threaded applications to make sure
* that @func is emitted under the Clutter threads lock and invoked
* from the same thread that started the Clutter main loop. For instance,
* it can be used to update the UI using the results from a worker
* thread:
*
* |[
* static gboolean
* update_ui (gpointer data)
* {
* SomeClosure *closure = data;
*
* /&ast; it is safe to call Clutter API from this function because
* &ast; it is invoked from the same thread that started the main
* &ast; loop and under the Clutter thread lock
* &ast;/
* clutter_label_set_text (CLUTTER_LABEL (closure-&gt;label),
* closure-&gt;text);
*
* g_object_unref (closure-&gt;label);
* g_free (closure);
*
* return FALSE;
* }
*
* /&ast; within another thread &ast;/
* closure = g_new0 (SomeClosure, 1);
* /&ast; always take a reference on GObject instances &ast;/
* closure-&gt;label = g_object_ref (my_application-&gt;label);
* closure-&gt;text = g_strdup (processed_text_to_update_the_label);
*
* clutter_threads_add_idle_full (G_PRIORITY_HIGH_IDLE,
* update_ui,
* closure,
* NULL);
* ]|
*
* Rename to: clutter_threads_add_idle
*
* Return value: the ID (greater than 0) of the event source.
*
* Since: 0.4
*/
guint
clutter_threads_add_idle_full (gint priority,
GSourceFunc func,
gpointer data,
GDestroyNotify notify)
{
ClutterThreadsDispatch *dispatch;
g_return_val_if_fail (func != NULL, 0);
dispatch = g_slice_new (ClutterThreadsDispatch);
dispatch->func = func;
dispatch->data = data;
dispatch->notify = notify;
return g_idle_add_full (priority,
_clutter_threads_dispatch, dispatch,
_clutter_threads_dispatch_free);
}
/**
* clutter_threads_add_idle: (skip)
* @func: function to call
* @data: data to pass to the function
*
* Simple wrapper around clutter_threads_add_idle_full() using the
* default priority.
*
* Return value: the ID (greater than 0) of the event source.
*
* Since: 0.4
*/
guint
clutter_threads_add_idle (GSourceFunc func,
gpointer data)
{
g_return_val_if_fail (func != NULL, 0);
return clutter_threads_add_idle_full (G_PRIORITY_DEFAULT_IDLE,
func, data,
NULL);
}
/**
* clutter_threads_add_timeout_full:
* @priority: the priority of the timeout source. Typically this will be in the
* range between #G_PRIORITY_DEFAULT and #G_PRIORITY_HIGH.
* @interval: the time between calls to the function, in milliseconds
* @func: function to call
* @data: data to pass to the function
* @notify: function to call when the timeout source is removed
*
* Sets a function to be called at regular intervals holding the Clutter
* threads lock, with the given priority. The function is called repeatedly
* until it returns %FALSE, at which point the timeout is automatically
* removed and the function will not be called again. The @notify function
* is called when the timeout is removed.
*
* The first call to the function will be at the end of the first @interval.
*
* It is important to note that, due to how the Clutter main loop is
* implemented, the timing will not be accurate and it will not try to
* "keep up" with the interval. A more reliable source is available
* using clutter_threads_add_frame_source_full(), which is also internally
* used by #ClutterTimeline.
*
* See also clutter_threads_add_idle_full().
*
* Rename to: clutter_threads_add_timeout
*
* Return value: the ID (greater than 0) of the event source.
*
* Since: 0.4
*/
guint
clutter_threads_add_timeout_full (gint priority,
guint interval,
GSourceFunc func,
gpointer data,
GDestroyNotify notify)
{
ClutterThreadsDispatch *dispatch;
g_return_val_if_fail (func != NULL, 0);
dispatch = g_slice_new (ClutterThreadsDispatch);
dispatch->func = func;
dispatch->data = data;
dispatch->notify = notify;
return g_timeout_add_full (priority,
interval,
_clutter_threads_dispatch, dispatch,
_clutter_threads_dispatch_free);
}
/**
* clutter_threads_add_timeout: (skip)
* @interval: the time between calls to the function, in milliseconds
* @func: function to call
* @data: data to pass to the function
*
* Simple wrapper around clutter_threads_add_timeout_full().
*
* Return value: the ID (greater than 0) of the event source.
*
* Since: 0.4
*/
guint
clutter_threads_add_timeout (guint interval,
GSourceFunc func,
gpointer data)
{
g_return_val_if_fail (func != NULL, 0);
return clutter_threads_add_timeout_full (G_PRIORITY_DEFAULT,
interval,
func, data,
NULL);
}
/**
* clutter_threads_enter:
*
* Locks the Clutter thread lock.
*
* Since: 0.4
*/
void
clutter_threads_enter (void)
{
if (clutter_threads_lock)
(* clutter_threads_lock) ();
}
/**
* clutter_threads_leave:
*
* Unlocks the Clutter thread lock.
*
* Since: 0.4
*/
void
clutter_threads_leave (void)
{
if (clutter_threads_unlock)
(* clutter_threads_unlock) ();
}
/**
* clutter_get_debug_enabled:
*
* Check if clutter has debugging turned on.
*
* Return value: TRUE if debugging is turned on, FALSE otherwise.
*/
gboolean
clutter_get_debug_enabled (void)
{
#ifdef CLUTTER_ENABLE_DEBUG
return clutter_debug_flags != 0;
#else
return FALSE;
#endif
}
gboolean
_clutter_context_is_initialized (void)
{
if (ClutterCntx == NULL)
return FALSE;
return ClutterCntx->is_initialized;
}
ClutterMainContext *
_clutter_context_get_default (void)
{
if (G_UNLIKELY (ClutterCntx == NULL))
{
ClutterMainContext *ctx;
ClutterCntx = ctx = g_new0 (ClutterMainContext, 1);
/* create the default backend */
ctx->backend = g_object_new (_clutter_backend_impl_get_type (), NULL);
ctx->is_initialized = FALSE;
ctx->motion_events_per_actor = TRUE;
#ifdef CLUTTER_ENABLE_DEBUG
ctx->timer = g_timer_new ();
g_timer_start (ctx->timer);
#endif
}
return ClutterCntx;
}
/**
* clutter_get_timestamp:
*
* Returns the approximate number of microseconds passed since clutter was
* intialised.
*
* Return value: Number of microseconds since clutter_init() was called.
*/
gulong
clutter_get_timestamp (void)
{
#ifdef CLUTTER_ENABLE_DEBUG
ClutterMainContext *ctx;
gdouble seconds;
ctx = _clutter_context_get_default ();
/* FIXME: may need a custom timer for embedded setups */
seconds = g_timer_elapsed (ctx->timer, NULL);
return (gulong)(seconds / 1.0e-6);
#else
return 0;
#endif
}
static gboolean
clutter_arg_direction_cb (const char *key,
const char *value,
gpointer user_data)
{
clutter_text_direction =
(strcmp (value, "rtl") == 0) ? CLUTTER_TEXT_DIRECTION_RTL
: CLUTTER_TEXT_DIRECTION_LTR;
return TRUE;
}
#ifdef CLUTTER_ENABLE_DEBUG
static gboolean
clutter_arg_debug_cb (const char *key,
const char *value,
gpointer user_data)
{
clutter_debug_flags |=
g_parse_debug_string (value,
clutter_debug_keys,
G_N_ELEMENTS (clutter_debug_keys));
return TRUE;
}
static gboolean
clutter_arg_no_debug_cb (const char *key,
const char *value,
gpointer user_data)
{
clutter_debug_flags &=
~g_parse_debug_string (value,
clutter_debug_keys,
G_N_ELEMENTS (clutter_debug_keys));
return TRUE;
}
#endif /* CLUTTER_ENABLE_DEBUG */
#ifdef CLUTTER_ENABLE_PROFILE
static gboolean
clutter_arg_profile_cb (const char *key,
const char *value,
gpointer user_data)
{
clutter_profile_flags |=
g_parse_debug_string (value,
clutter_profile_keys,
G_N_ELEMENTS (clutter_profile_keys));
return TRUE;
}
static gboolean
clutter_arg_no_profile_cb (const char *key,
const char *value,
gpointer user_data)
{
clutter_profile_flags &=
~g_parse_debug_string (value,
clutter_profile_keys,
G_N_ELEMENTS (clutter_profile_keys));
return TRUE;
}
#endif /* CLUTTER_ENABLE_PROFILE */
GQuark
clutter_init_error_quark (void)
{
return g_quark_from_static_string ("clutter-init-error-quark");
}
static ClutterInitError
clutter_init_real (GError **error)
{
ClutterMainContext *ctx;
ClutterBackend *backend;
/* Note, creates backend if not already existing, though parse args will
* have likely created it
*/
ctx = _clutter_context_get_default ();
backend = ctx->backend;
if (!ctx->options_parsed)
{
if (error)
g_set_error (error, CLUTTER_INIT_ERROR,
CLUTTER_INIT_ERROR_INTERNAL,
"When using clutter_get_option_group_without_init() "
"you must parse options before calling clutter_init()");
else
g_critical ("When using clutter_get_option_group_without_init() "
"you must parse options before calling clutter_init()");
return CLUTTER_INIT_ERROR_INTERNAL;
}
/*
* Call backend post parse hooks.
*/
if (!_clutter_backend_post_parse (backend, error))
return CLUTTER_INIT_ERROR_BACKEND;
/* If we are displaying the regions that would get redrawn with clipped
* redraws enabled we actually have to disable the clipped redrawing
* because otherwise we end up with nasty trails of rectangles everywhere.
*/
if (clutter_paint_debug_flags & CLUTTER_DEBUG_REDRAWS)
clutter_paint_debug_flags |= CLUTTER_DEBUG_DISABLE_CLIPPED_REDRAWS;
/* The same is true when drawing the outlines of paint volumes... */
if (clutter_paint_debug_flags & CLUTTER_DEBUG_PAINT_VOLUMES)
{
clutter_paint_debug_flags |=
CLUTTER_DEBUG_DISABLE_CLIPPED_REDRAWS | CLUTTER_DEBUG_DISABLE_CULLING;
}
/* this will take care of initializing Cogl's state and
* query the GL machinery for features
*/
if (!_clutter_feature_init (error))
return CLUTTER_INIT_ERROR_BACKEND;
#ifdef CLUTTER_ENABLE_PROFILE
/* We need to be absolutely sure that uprof has been initialized
* before calling _clutter_uprof_init. uprof_init (NULL, NULL)
* will be a NOP if it has been initialized but it will also
* mean subsequent parsing of the UProf GOptionGroup will have no
* affect.
*
* Sadly GOptionGroup based library initialization is extremly
* fragile by design because GOptionGroups have no notion of
* dependencies and our post_parse_hook may be called before
* the cogl or uprof groups get parsed.
*/
uprof_init (NULL, NULL);
_clutter_uprof_init ();
if (clutter_profile_flags & CLUTTER_PROFILE_PICKING_ONLY)
_clutter_profile_suspend ();
#endif
clutter_text_direction = clutter_get_text_direction ();
/* Initiate event collection */
_clutter_backend_init_events (ctx->backend);
clutter_is_initialized = TRUE;
ctx->is_initialized = TRUE;
/* Initialize a11y */
if (clutter_enable_accessibility)
cally_accessibility_init ();
return CLUTTER_INIT_SUCCESS;
}
static GOptionEntry clutter_args[] = {
{ "clutter-show-fps", 0, 0, G_OPTION_ARG_NONE, &clutter_show_fps,
N_("Show frames per second"), NULL },
{ "clutter-default-fps", 0, 0, G_OPTION_ARG_INT, &clutter_default_fps,
N_("Default frame rate"), "FPS" },
{ "g-fatal-warnings", 0, 0, G_OPTION_ARG_NONE, &clutter_fatal_warnings,
N_("Make all warnings fatal"), NULL },
{ "clutter-text-direction", 0, 0, G_OPTION_ARG_CALLBACK,
clutter_arg_direction_cb,
N_("Direction for the text"), "DIRECTION" },
{ "clutter-disable-mipmapped-text", 0, 0, G_OPTION_ARG_NONE,
&clutter_disable_mipmap_text,
N_("Disable mipmapping on text"), NULL },
{ "clutter-use-fuzzy-picking", 0, 0, G_OPTION_ARG_NONE,
&clutter_use_fuzzy_picking,
N_("Use 'fuzzy' picking"), NULL },
#ifdef CLUTTER_ENABLE_DEBUG
{ "clutter-debug", 0, 0, G_OPTION_ARG_CALLBACK, clutter_arg_debug_cb,
N_("Clutter debugging flags to set"), "FLAGS" },
{ "clutter-no-debug", 0, 0, G_OPTION_ARG_CALLBACK, clutter_arg_no_debug_cb,
N_("Clutter debugging flags to unset"), "FLAGS" },
#endif /* CLUTTER_ENABLE_DEBUG */
#ifdef CLUTTER_ENABLE_PROFILE
{ "clutter-profile", 0, 0, G_OPTION_ARG_CALLBACK, clutter_arg_profile_cb,
N_("Clutter profiling flags to set"), "FLAGS" },
{ "clutter-no-profile", 0, 0, G_OPTION_ARG_CALLBACK, clutter_arg_no_profile_cb,
N_("Clutter profiling flags to unset"), "FLAGS" },
#endif /* CLUTTER_ENABLE_PROFILE */
{ "clutter-enable-accessibility", 0, 0, G_OPTION_ARG_NONE, &clutter_enable_accessibility,
N_("Enable accessibility"), NULL },
{ NULL, },
};
/* pre_parse_hook: initialise variables depending on environment
* variables; these variables might be overridden by the command
* line arguments that are going to be parsed after.
*/
static gboolean
pre_parse_hook (GOptionContext *context,
GOptionGroup *group,
gpointer data,
GError **error)
{
ClutterMainContext *clutter_context;
ClutterBackend *backend;
const char *env_string;
if (clutter_is_initialized)
return TRUE;
if (setlocale (LC_ALL, "") == NULL)
g_warning ("Locale not supported by C library.\n"
"Using the fallback 'C' locale.");
clutter_context = _clutter_context_get_default ();
clutter_context->id_pool = _clutter_id_pool_new (256);
backend = clutter_context->backend;
g_assert (CLUTTER_IS_BACKEND (backend));
#ifdef CLUTTER_ENABLE_DEBUG
env_string = g_getenv ("CLUTTER_DEBUG");
if (env_string != NULL)
{
clutter_debug_flags =
g_parse_debug_string (env_string,
clutter_debug_keys,
G_N_ELEMENTS (clutter_debug_keys));
env_string = NULL;
}
#endif /* CLUTTER_ENABLE_DEBUG */
#ifdef CLUTTER_ENABLE_PROFILE
env_string = g_getenv ("CLUTTER_PROFILE");
if (env_string != NULL)
{
clutter_profile_flags =
g_parse_debug_string (env_string,
clutter_profile_keys,
G_N_ELEMENTS (clutter_profile_keys));
env_string = NULL;
}
#endif /* CLUTTER_ENABLE_PROFILE */
env_string = g_getenv ("CLUTTER_PICK");
if (env_string != NULL)
{
clutter_pick_debug_flags =
g_parse_debug_string (env_string,
clutter_pick_debug_keys,
G_N_ELEMENTS (clutter_pick_debug_keys));
env_string = NULL;
}
env_string = g_getenv ("CLUTTER_PAINT");
if (env_string != NULL)
{
clutter_paint_debug_flags =
g_parse_debug_string (env_string,
clutter_paint_debug_keys,
G_N_ELEMENTS (clutter_paint_debug_keys));
env_string = NULL;
}
env_string = g_getenv ("CLUTTER_SHOW_FPS");
if (env_string)
clutter_show_fps = TRUE;
env_string = g_getenv ("CLUTTER_DEFAULT_FPS");
if (env_string)
{
gint default_fps = g_ascii_strtoll (env_string, NULL, 10);
clutter_default_fps = CLAMP (default_fps, 1, 1000);
}
env_string = g_getenv ("CLUTTER_DISABLE_MIPMAPPED_TEXT");
if (env_string)
clutter_disable_mipmap_text = TRUE;
env_string = g_getenv ("CLUTTER_FUZZY_PICK");
if (env_string)
clutter_use_fuzzy_picking = TRUE;
return _clutter_backend_pre_parse (backend, error);
}
/* post_parse_hook: initialise the context and data structures
* and opens the X display
*/
static gboolean
post_parse_hook (GOptionContext *context,
GOptionGroup *group,
gpointer data,
GError **error)
{
ClutterMainContext *clutter_context;
ClutterBackend *backend;
if (clutter_is_initialized)
return TRUE;
clutter_context = _clutter_context_get_default ();
backend = clutter_context->backend;
g_assert (CLUTTER_IS_BACKEND (backend));
if (clutter_fatal_warnings)
{
GLogLevelFlags fatal_mask;
fatal_mask = g_log_set_always_fatal (G_LOG_FATAL_MASK);
fatal_mask |= G_LOG_LEVEL_WARNING | G_LOG_LEVEL_CRITICAL;
g_log_set_always_fatal (fatal_mask);
}
clutter_context->frame_rate = clutter_default_fps;
clutter_context->options_parsed = TRUE;
/*
* If not asked to defer display setup, call clutter_init_real(),
* which in turn calls the backend post parse hooks.
*/
if (!clutter_context->defer_display_setup)
return clutter_init_real (error) == CLUTTER_INIT_SUCCESS;
return TRUE;
}
/**
* clutter_get_option_group: (skip)
*
* Returns a #GOptionGroup for the command line arguments recognized
* by Clutter. You should add this group to your #GOptionContext with
* g_option_context_add_group(), if you are using g_option_context_parse()
* to parse your commandline arguments.
*
* Calling g_option_context_parse() with Clutter's #GOptionGroup will result
* in Clutter's initialization. That is, the following code:
*
* |[
* g_option_context_set_main_group (context, clutter_get_option_group ());
* res = g_option_context_parse (context, &amp;argc, &amp;argc, NULL);
* ]|
*
* is functionally equivalent to:
*
* |[
* clutter_init (&amp;argc, &amp;argv);
* ]|
*
* After g_option_context_parse() on a #GOptionContext containing the
* Clutter #GOptionGroup has returned %TRUE, Clutter is guaranteed to be
* initialized.
*
* Return value: (transfer full): a #GOptionGroup for the commandline arguments
* recognized by Clutter
*
* Since: 0.2
*/
GOptionGroup *
clutter_get_option_group (void)
{
ClutterMainContext *context;
GOptionGroup *group;
clutter_base_init ();
context = _clutter_context_get_default ();
group = g_option_group_new ("clutter",
_("Clutter Options"),
_("Show Clutter Options"),
NULL,
NULL);
g_option_group_set_parse_hooks (group, pre_parse_hook, post_parse_hook);
g_option_group_add_entries (group, clutter_args);
g_option_group_set_translation_domain (group, GETTEXT_PACKAGE);
/* add backend-specific options */
_clutter_backend_add_options (context->backend, group);
return group;
}
/**
* clutter_get_option_group_without_init: (skip)
*
* Returns a #GOptionGroup for the command line arguments recognized
* by Clutter. You should add this group to your #GOptionContext with
* g_option_context_add_group(), if you are using g_option_context_parse()
* to parse your commandline arguments.
*
* Unlike clutter_get_option_group(), calling g_option_context_parse() with
* the #GOptionGroup returned by this function requires a subsequent explicit
* call to clutter_init(); use this function when needing to set foreign
* display connection with clutter_x11_set_display(), or with
* <function>gtk_clutter_init()</function>.
*
* Return value: (transfer full): a #GOptionGroup for the commandline arguments
* recognized by Clutter
*
* Since: 0.8.2
*/
GOptionGroup *
clutter_get_option_group_without_init (void)
{
ClutterMainContext *context;
GOptionGroup *group;
clutter_base_init ();
context = _clutter_context_get_default ();
context->defer_display_setup = TRUE;
group = clutter_get_option_group ();
return group;
}
/* Note that the gobject-introspection annotations for the argc/argv
* parameters do not produce the right result; however, they do
* allow the common case of argc=NULL, argv=NULL to work.
*/
/**
* clutter_init_with_args:
* @argc: (inout): a pointer to the number of command line arguments
* @argv: (array length=argc) (inout) (allow-none): a pointer to the array
* of command line arguments
* @parameter_string: (allow-none): a string which is displayed in the
* first line of <option>--help</option> output, after
* <literal><replaceable>programname</replaceable> [OPTION...]</literal>
* @entries: (allow-none): a %NULL terminated array of #GOptionEntry<!-- -->s
* describing the options of your program
* @translation_domain: (allow-none): a translation domain to use for
* translating the <option>--help</option> output for the options in
* @entries with gettext(), or %NULL
* @error: (allow-none): a return location for a #GError
*
* This function does the same work as clutter_init(). Additionally,
* it allows you to add your own command line options, and it
* automatically generates nicely formatted <option>--help</option>
* output. Note that your program will be terminated after writing
* out the help output. Also note that, in case of error, the
* error message will be placed inside @error instead of being
* printed on the display.
*
* Return value: %CLUTTER_INIT_SUCCESS if Clutter has been successfully
* initialised, or other values or #ClutterInitError in case of
* error.
*
* Since: 0.2
*/
ClutterInitError
clutter_init_with_args (int *argc,
char ***argv,
const char *parameter_string,
GOptionEntry *entries,
const char *translation_domain,
GError **error)
{
GOptionContext *context;
GOptionGroup *group;
gboolean res;
ClutterMainContext *ctx;
if (clutter_is_initialized)
return CLUTTER_INIT_SUCCESS;
clutter_base_init ();
ctx = _clutter_context_get_default ();
if (!ctx->defer_display_setup)
{
#if 0
if (argc && *argc > 0 && *argv)
g_set_prgname ((*argv)[0]);
#endif
context = g_option_context_new (parameter_string);
group = clutter_get_option_group ();
g_option_context_add_group (context, group);
group = cogl_get_option_group ();
g_option_context_add_group (context, group);
/* Note: That due to the implementation details of glib's goption
* parsing; cogl and uprof will not actually have there arguments
* parsed before the post_parse_hook is called! */
#ifdef CLUTTER_ENABLE_PROFILE
group = uprof_get_option_group ();
g_option_context_add_group (context, group);
#endif
if (entries)
g_option_context_add_main_entries (context, entries, translation_domain);
res = g_option_context_parse (context, argc, argv, error);
g_option_context_free (context);
/* if res is FALSE, the error is filled for
* us by g_option_context_parse()
*/
if (!res)
{
/* if there has been an error in the initialization, the
* error id will be preserved inside the GError code
*/
if (error && *error)
return (*error)->code;
else
return CLUTTER_INIT_ERROR_INTERNAL;
}
return CLUTTER_INIT_SUCCESS;
}
else
return clutter_init_real (error);
}
static gboolean
clutter_parse_args (int *argc,
char ***argv,
GError **error)
{
GOptionContext *option_context;
GOptionGroup *clutter_group, *cogl_group;
#ifdef CLUTTER_ENABLE_PROFILE
GOptionGroup *uprof_group;
#endif
GError *internal_error = NULL;
gboolean ret = TRUE;
if (clutter_is_initialized)
return TRUE;
option_context = g_option_context_new (NULL);
g_option_context_set_ignore_unknown_options (option_context, TRUE);
g_option_context_set_help_enabled (option_context, FALSE);
/* Initiate any command line options from the backend */
clutter_group = clutter_get_option_group ();
g_option_context_set_main_group (option_context, clutter_group);
cogl_group = cogl_get_option_group ();
g_option_context_add_group (option_context, cogl_group);
#ifdef CLUTTER_ENABLE_PROFILE
uprof_group = uprof_get_option_group ();
g_option_context_add_group (option_context, uprof_group);
#endif
if (!g_option_context_parse (option_context, argc, argv, &internal_error))
{
g_propagate_error (error, internal_error);
ret = FALSE;
}
g_option_context_free (option_context);
return ret;
}
/**
* clutter_init:
* @argc: (inout): The number of arguments in @argv
* @argv: (array length=argc) (inout) (allow-none): A pointer to an array
* of arguments.
*
* Initialises everything needed to operate with Clutter and parses some
* standard command line options; @argc and @argv are adjusted accordingly
* so your own code will never see those standard arguments.
*
* It is safe to call this function multiple times.
*
* <note>This function will not abort in case of errors during
* initialization; clutter_init() will print out the error message on
* stderr, and will return an error code. It is up to the application
* code to handle this case. If you need to display the error message
* yourself, you can use clutter_init_with_args(), which takes a #GError
* pointer.</note>
*
* Return value: a #ClutterInitError value
*/
ClutterInitError
clutter_init (int *argc,
char ***argv)
{
ClutterMainContext *ctx;
GError *error = NULL;
ClutterInitError res;
if (clutter_is_initialized)
return CLUTTER_INIT_SUCCESS;
clutter_base_init ();
ctx = _clutter_context_get_default ();
if (!ctx->defer_display_setup)
{
#if 0
if (argc && *argc > 0 && *argv)
g_set_prgname ((*argv)[0]);
#endif
/* parse_args will trigger backend creation and things like
* DISPLAY connection etc.
*/
if (!clutter_parse_args (argc, argv, &error))
{
g_critical ("Unable to initialize Clutter: %s", error->message);
g_error_free (error);
res = CLUTTER_INIT_ERROR_INTERNAL;
}
else
res = CLUTTER_INIT_SUCCESS;
}
else
{
res = clutter_init_real (&error);
if (error != NULL)
{
g_critical ("Unable to initialize Clutter: %s", error->message);
g_error_free (error);
}
}
return res;
}
gboolean
_clutter_boolean_handled_accumulator (GSignalInvocationHint *ihint,
GValue *return_accu,
const GValue *handler_return,
gpointer dummy)
{
gboolean continue_emission;
gboolean signal_handled;
signal_handled = g_value_get_boolean (handler_return);
g_value_set_boolean (return_accu, signal_handled);
continue_emission = !signal_handled;
return continue_emission;
}
static void
event_click_count_generate (ClutterEvent *event)
{
/* multiple button click detection */
static gint click_count = 0;
static gint previous_x = -1;
static gint previous_y = -1;
static guint32 previous_time = 0;
static gint previous_button_number = -1;
ClutterInputDevice *device = NULL;
ClutterSettings *settings;
guint double_click_time;
guint double_click_distance;
settings = clutter_settings_get_default ();
g_object_get (settings,
"double-click-distance", &double_click_distance,
"double-click-time", &double_click_time,
NULL);
device = clutter_event_get_device (event);
if (device != NULL)
{
click_count = device->click_count;
previous_x = device->previous_x;
previous_y = device->previous_y;
previous_time = device->previous_time;
previous_button_number = device->previous_button_number;
CLUTTER_NOTE (EVENT,
"Restoring previous click count:%d (device:%d, time:%u)",
click_count,
clutter_input_device_get_device_id (device),
previous_time);
}
else
{
CLUTTER_NOTE (EVENT,
"Restoring previous click count:%d (time:%u)",
click_count,
previous_time);
}
switch (clutter_event_type (event))
{
case CLUTTER_BUTTON_PRESS:
/* check if we are in time and within distance to increment an
* existing click count
*/
if (event->button.button == previous_button_number &&
event->button.time < (previous_time + double_click_time) &&
(ABS (event->button.x - previous_x) <= double_click_distance) &&
(ABS (event->button.y - previous_y) <= double_click_distance))
{
CLUTTER_NOTE (EVENT, "Increase click count (button: %d, time: %u)",
event->button.button,
event->button.time);
click_count += 1;
}
else /* start a new click count*/
{
CLUTTER_NOTE (EVENT, "Reset click count (button: %d, time: %u)",
event->button.button,
event->button.time);
click_count = 1;
previous_button_number = event->button.button;
}
previous_x = event->button.x;
previous_y = event->button.y;
previous_time = event->button.time;
/* fallthrough */
case CLUTTER_BUTTON_RELEASE:
event->button.click_count = click_count;
break;
default:
g_assert_not_reached ();
break;
}
if (event->type == CLUTTER_BUTTON_PRESS && device != NULL)
{
CLUTTER_NOTE (EVENT, "Storing click count: %d (device:%d, time:%u)",
click_count,
clutter_input_device_get_device_id (device),
previous_time);
device->click_count = click_count;
device->previous_x = previous_x;
device->previous_y = previous_y;
device->previous_time = previous_time;
device->previous_button_number = previous_button_number;
}
}
static inline void
emit_event (ClutterEvent *event,
gboolean is_key_event)
{
static gboolean lock = FALSE;
GPtrArray *event_tree = NULL;
ClutterActor *actor;
gint i = 0;
if (event->any.source == NULL)
{
CLUTTER_NOTE (EVENT, "No source set, discarding event");
return;
}
/* reentrancy check */
if (lock != FALSE)
{
g_warning ("Tried emitting event during event delivery, bailing out.");
return;
}
lock = TRUE;
event_tree = g_ptr_array_sized_new (64);
actor = event->any.source;
/* Build 'tree' of emitters for the event */
while (actor)
{
ClutterActor *parent;
parent = clutter_actor_get_parent (actor);
if (clutter_actor_get_reactive (actor) ||
parent == NULL || /* stage gets all events */
is_key_event) /* keyboard events are always emitted */
{
g_ptr_array_add (event_tree, g_object_ref (actor));
}
actor = parent;
}
/* Capture */
for (i = event_tree->len - 1; i >= 0; i--)
if (clutter_actor_event (g_ptr_array_index (event_tree, i), event, TRUE))
goto done;
/* Bubble */
for (i = 0; i < event_tree->len; i++)
if (clutter_actor_event (g_ptr_array_index (event_tree, i), event, FALSE))
goto done;
done:
for (i = 0; i < event_tree->len; i++)
g_object_unref (g_ptr_array_index (event_tree, i));
g_ptr_array_free (event_tree, TRUE);
lock = FALSE;
}
/*
* Emits a pointer event after having prepared the event for delivery (setting
* source, computing click_count, generating enter/leave etc.).
*/
static inline void
emit_pointer_event (ClutterEvent *event,
ClutterInputDevice *device)
{
ClutterMainContext *context = _clutter_context_get_default ();
if (context->pointer_grab_actor == NULL &&
(device == NULL || device->pointer_grab_actor == NULL))
{
/* no grab, time to capture and bubble */
emit_event (event, FALSE);
}
else
{
if (context->pointer_grab_actor != NULL)
{
/* global grab */
clutter_actor_event (context->pointer_grab_actor, event, FALSE);
}
else if (device != NULL && device->pointer_grab_actor != NULL)
{
/* per device grab */
clutter_actor_event (device->pointer_grab_actor, event, FALSE);
}
}
}
static inline void
emit_keyboard_event (ClutterEvent *event)
{
ClutterMainContext *context = _clutter_context_get_default ();
if (context->keyboard_grab_actor == NULL)
emit_event (event, TRUE);
else
clutter_actor_event (context->keyboard_grab_actor, event, FALSE);
}
static gboolean
is_off_stage (ClutterActor *stage,
gfloat x,
gfloat y)
{
gfloat width, height;
clutter_actor_get_size (stage, &width, &height);
return (x < 0 ||
y < 0 ||
x >= width ||
y >= height);
}
/**
* clutter_do_event
* @event: a #ClutterEvent.
*
* Processes an event.
*
* The @event must be a valid #ClutterEvent and have a #ClutterStage
* associated to it.
*
* This function is only useful when embedding Clutter inside another
* toolkit, and it should never be called by applications.
*
* Since: 0.4
*/
void
clutter_do_event (ClutterEvent *event)
{
/* we need the stage for the event */
if (event->any.stage == NULL)
{
g_warning ("%s: Event does not have a stage: discarding.", G_STRFUNC);
return;
}
/* stages in destruction do not process events */
if (CLUTTER_ACTOR_IN_DESTRUCTION (event->any.stage))
return;
/* Instead of processing events when received, we queue them up to
* handle per-frame before animations, layout, and drawing.
*
* This gives us the chance to reliably compress motion events
* because we've "looked ahead" and know all motion events that
* will occur before drawing the frame.
*/
_clutter_stage_queue_event (event->any.stage, event);
}
static void
_clutter_process_event_details (ClutterActor *stage,
ClutterMainContext *context,
ClutterEvent *event)
{
ClutterInputDevice *device = NULL;
device = clutter_event_get_device (event);
switch (event->type)
{
case CLUTTER_NOTHING:
event->any.source = stage;
break;
case CLUTTER_KEY_PRESS:
case CLUTTER_KEY_RELEASE:
{
ClutterActor *actor = NULL;
/* check that we're not a synthetic event with source set */
if (event->any.source == NULL)
{
actor = clutter_stage_get_key_focus (CLUTTER_STAGE (stage));
event->any.source = actor;
if (G_UNLIKELY (actor == NULL))
{
g_warning ("No key focus set, discarding");
return;
}
}
emit_keyboard_event (event);
}
break;
case CLUTTER_ENTER:
/* if we're entering from outside the stage we need
* to check whether the pointer is actually on another
* actor, and emit an additional pointer event
*/
if (event->any.source == stage &&
event->crossing.related == NULL)
{
ClutterActor *actor = NULL;
emit_pointer_event (event, device);
actor = _clutter_input_device_update (device, FALSE);
if (actor != stage)
{
ClutterEvent *crossing;
/* we emit the exact same event on the actor */
crossing = clutter_event_copy (event);
crossing->crossing.related = stage;
crossing->crossing.source = actor;
emit_pointer_event (crossing, device);
clutter_event_free (crossing);
}
}
else
emit_pointer_event (event, device);
break;
case CLUTTER_LEAVE:
/* same as CLUTTER_ENTER above: when leaving the stage
* we need to also emit a CLUTTER_LEAVE event on the
* actor currently underneath the device, unless it's the
* stage
*/
if (event->any.source == stage &&
event->crossing.related == NULL &&
device->cursor_actor != stage)
{
ClutterEvent *crossing;
crossing = clutter_event_copy (event);
crossing->crossing.related = stage;
crossing->crossing.source = device->cursor_actor;
emit_pointer_event (crossing, device);
clutter_event_free (crossing);
}
emit_pointer_event (event, device);
break;
case CLUTTER_DESTROY_NOTIFY:
case CLUTTER_DELETE:
event->any.source = stage;
/* the stage did not handle the event, so we just quit */
clutter_stage_event (CLUTTER_STAGE (stage), event);
break;
case CLUTTER_MOTION:
/* only the stage gets motion events if they are enabled */
if (!clutter_stage_get_motion_events_enabled (CLUTTER_STAGE (stage)) &&
event->any.source == NULL)
{
/* Only stage gets motion events */
event->any.source = stage;
/* global grabs */
if (context->pointer_grab_actor != NULL)
{
clutter_actor_event (context->pointer_grab_actor,
event,
FALSE);
break;
}
else if (device != NULL && device->pointer_grab_actor != NULL)
{
clutter_actor_event (device->pointer_grab_actor,
event,
FALSE);
break;
}
/* Trigger handlers on stage in both capture .. */
if (!clutter_actor_event (stage, event, TRUE))
{
/* and bubbling phase */
clutter_actor_event (stage, event, FALSE);
}
break;
}
/* fallthrough from motion */
case CLUTTER_BUTTON_PRESS:
case CLUTTER_BUTTON_RELEASE:
case CLUTTER_SCROLL:
{
ClutterActor *actor;
gfloat x, y;
clutter_event_get_coords (event, &x, &y);
/* Only do a pick to find the source if source is not already set
* (as it could be in a synthetic event)
*/
if (event->any.source == NULL)
{
/* emulate X11 the implicit soft grab; the implicit soft grab
* keeps relaying motion events when the stage is left with a
* pointer button pressed. since this is what happens when we
* disable per-actor motion events we need to maintain the same
* behaviour when the per-actor motion events are enabled as
* well
*/
if (is_off_stage (stage, x, y))
{
if (event->type == CLUTTER_BUTTON_RELEASE)
{
CLUTTER_NOTE (EVENT,
"Release off stage received at %.2f, %.2f",
x, y);
event->button.source = stage;
event->button.click_count = 1;
emit_pointer_event (event, device);
}
else if (event->type == CLUTTER_MOTION)
{
CLUTTER_NOTE (EVENT,
"Motion off stage received at %.2f, %2.f",
x, y);
event->motion.source = stage;
emit_pointer_event (event, device);
}
break;
}
/* if the backend provides a device then we should
* already have everything we need to update it and
* get the actor underneath
*/
if (device != NULL)
actor = _clutter_input_device_update (device, TRUE);
else
{
CLUTTER_NOTE (EVENT, "No device found: picking");
actor = _clutter_stage_do_pick (CLUTTER_STAGE (stage),
x, y,
CLUTTER_PICK_REACTIVE);
}
if (actor == NULL)
break;
event->any.source = actor;
}
else
{
/* use the source already set in the synthetic event */
actor = event->any.source;
}
CLUTTER_NOTE (EVENT,
"Reactive event received at %.2f, %.2f - actor: %p",
x, y,
actor);
/* button presses and releases need a click count */
if (event->type == CLUTTER_BUTTON_PRESS ||
event->type == CLUTTER_BUTTON_RELEASE)
{
/* Generate click count */
event_click_count_generate (event);
}
emit_pointer_event (event, device);
break;
}
case CLUTTER_STAGE_STATE:
/* fullscreen / focus - forward to stage */
event->any.source = stage;
clutter_stage_event (CLUTTER_STAGE (stage), event);
break;
case CLUTTER_CLIENT_MESSAGE:
break;
}
}
/**
* _clutter_process_event
* @event: a #ClutterEvent.
*
* Does the actual work of processing an event that was queued earlier
* out of clutter_do_event().
*/
void
_clutter_process_event (ClutterEvent *event)
{
ClutterMainContext *context;
ClutterActor *stage;
context = _clutter_context_get_default ();
stage = CLUTTER_ACTOR (event->any.stage);
if (stage == NULL)
return;
CLUTTER_TIMESTAMP (EVENT, "Event received");
context->last_event_time = clutter_event_get_time (event);
context->current_event = event;
_clutter_process_event_details (stage, context, event);
context->current_event = NULL;
}
/**
* clutter_get_actor_by_gid:
* @id_: a #ClutterActor unique id.
*
* Retrieves the #ClutterActor with @id_.
*
* Return value: (transfer none): the actor with the passed id or %NULL.
* The returned actor does not have its reference count increased.
*
* Since: 0.6
*
* Deprecated: 1.8: The id is not used any longer.
*/
ClutterActor *
clutter_get_actor_by_gid (guint32 id_)
{
return _clutter_get_actor_by_id (NULL, id_);
}
void
clutter_base_init (void)
{
static gboolean initialised = FALSE;
if (!initialised)
{
initialised = TRUE;
bindtextdomain (GETTEXT_PACKAGE, CLUTTER_LOCALEDIR);
bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
/* initialise GLib type system */
g_type_init ();
}
}
/**
* clutter_get_default_frame_rate:
*
* Retrieves the default frame rate. See clutter_set_default_frame_rate().
*
* Return value: the default frame rate
*
* Since: 0.6
*/
guint
clutter_get_default_frame_rate (void)
{
ClutterMainContext *context;
context = _clutter_context_get_default ();
return context->frame_rate;
}
/**
* clutter_set_default_frame_rate:
* @frames_per_sec: the new default frame rate
*
* Sets the default frame rate. This frame rate will be used to limit
* the number of frames drawn if Clutter is not able to synchronize
* with the vertical refresh rate of the display. When synchronization
* is possible, this value is ignored.
*
* Since: 0.6
*/
void
clutter_set_default_frame_rate (guint frames_per_sec)
{
ClutterMainContext *context;
context = _clutter_context_get_default ();
if (context->frame_rate != frames_per_sec)
context->frame_rate = frames_per_sec;
}
static void
on_pointer_grab_weak_notify (gpointer data,
GObject *where_the_object_was)
{
ClutterInputDevice *dev = (ClutterInputDevice *)data;
ClutterMainContext *context;
context = _clutter_context_get_default ();
if (dev)
{
dev->pointer_grab_actor = NULL;
clutter_ungrab_pointer_for_device (dev->id);
}
else
{
context->pointer_grab_actor = NULL;
clutter_ungrab_pointer ();
}
}
/**
* clutter_grab_pointer:
* @actor: a #ClutterActor
*
* Grabs pointer events, after the grab is done all pointer related events
* (press, motion, release, enter, leave and scroll) are delivered to this
* actor directly without passing through both capture and bubble phases of
* the event delivery chain. The source set in the event will be the actor
* that would have received the event if the pointer grab was not in effect.
*
* <note><para>Grabs completely override the entire event delivery chain
* done by Clutter. Pointer grabs should only be used as a last resource;
* using the #ClutterActor::captured-event signal should always be the
* preferred way to intercept event delivery to reactive actors.</para></note>
*
* If you wish to grab all the pointer events for a specific input device,
* you should use clutter_grab_pointer_for_device().
*
* Since: 0.6
*/
void
clutter_grab_pointer (ClutterActor *actor)
{
ClutterMainContext *context;
g_return_if_fail (actor == NULL || CLUTTER_IS_ACTOR (actor));
context = _clutter_context_get_default ();
if (context->pointer_grab_actor == actor)
return;
if (context->pointer_grab_actor)
{
g_object_weak_unref (G_OBJECT (context->pointer_grab_actor),
on_pointer_grab_weak_notify,
NULL);
context->pointer_grab_actor = NULL;
}
if (actor)
{
context->pointer_grab_actor = actor;
g_object_weak_ref (G_OBJECT (actor),
on_pointer_grab_weak_notify,
NULL);
}
}
/**
* clutter_grab_pointer_for_device:
* @actor: a #ClutterActor
* @id_: a device id, or -1
*
* Grabs all the pointer events coming from the device @id for @actor.
*
* If @id is -1 then this function is equivalent to clutter_grab_pointer().
*
* Since: 0.8
*/
void
clutter_grab_pointer_for_device (ClutterActor *actor,
gint id_)
{
ClutterInputDevice *dev;
g_return_if_fail (actor == NULL || CLUTTER_IS_ACTOR (actor));
/* essentially a global grab */
if (id_ == -1)
{
clutter_grab_pointer (actor);
return;
}
dev = clutter_get_input_device_for_id (id_);
if (dev == NULL)
return;
if (dev->pointer_grab_actor == actor)
return;
if (dev->pointer_grab_actor)
{
g_object_weak_unref (G_OBJECT (dev->pointer_grab_actor),
on_pointer_grab_weak_notify,
dev);
dev->pointer_grab_actor = NULL;
}
if (actor)
{
dev->pointer_grab_actor = actor;
g_object_weak_ref (G_OBJECT (actor),
on_pointer_grab_weak_notify,
dev);
}
}
/**
* clutter_ungrab_pointer:
*
* Removes an existing grab of the pointer.
*
* Since: 0.6
*/
void
clutter_ungrab_pointer (void)
{
clutter_grab_pointer (NULL);
}
/**
* clutter_ungrab_pointer_for_device:
* @id_: a device id
*
* Removes an existing grab of the pointer events for device @id_.
*
* Since: 0.8
*/
void
clutter_ungrab_pointer_for_device (gint id_)
{
clutter_grab_pointer_for_device (NULL, id_);
}
/**
* clutter_get_pointer_grab:
*
* Queries the current pointer grab of clutter.
*
* Return value: (transfer none): the actor currently holding the pointer grab, or NULL if there is no grab.
*
* Since: 0.6
*/
ClutterActor *
clutter_get_pointer_grab (void)
{
ClutterMainContext *context;
context = _clutter_context_get_default ();
return context->pointer_grab_actor;
}
static void
on_keyboard_grab_weak_notify (gpointer data,
GObject *where_the_object_was)
{
ClutterMainContext *context;
context = _clutter_context_get_default ();
context->keyboard_grab_actor = NULL;
clutter_ungrab_keyboard ();
}
/**
* clutter_grab_keyboard:
* @actor: a #ClutterActor
*
* Grabs keyboard events, after the grab is done keyboard
* events (#ClutterActor::key-press-event and #ClutterActor::key-release-event)
* are delivered to this actor directly. The source set in the event will be
* the actor that would have received the event if the keyboard grab was not
* in effect.
*
* Like pointer grabs, keyboard grabs should only be used as a last
* resource.
*
* See also clutter_stage_set_key_focus() and clutter_actor_grab_key_focus()
* to perform a "soft" key grab and assign key focus to a specific actor.
*
* Since: 0.6
*/
void
clutter_grab_keyboard (ClutterActor *actor)
{
ClutterMainContext *context;
g_return_if_fail (actor == NULL || CLUTTER_IS_ACTOR (actor));
context = _clutter_context_get_default ();
if (context->keyboard_grab_actor == actor)
return;
if (context->keyboard_grab_actor)
{
g_object_weak_unref (G_OBJECT (context->keyboard_grab_actor),
on_keyboard_grab_weak_notify,
NULL);
context->keyboard_grab_actor = NULL;
}
if (actor)
{
context->keyboard_grab_actor = actor;
g_object_weak_ref (G_OBJECT (actor),
on_keyboard_grab_weak_notify,
NULL);
}
}
/**
* clutter_ungrab_keyboard:
*
* Removes an existing grab of the keyboard.
*
* Since: 0.6
*/
void
clutter_ungrab_keyboard (void)
{
clutter_grab_keyboard (NULL);
}
/**
* clutter_get_keyboard_grab:
*
* Queries the current keyboard grab of clutter.
*
* Return value: (transfer none): the actor currently holding the keyboard grab, or NULL if there is no grab.
*
* Since: 0.6
*/
ClutterActor *
clutter_get_keyboard_grab (void)
{
ClutterMainContext *context;
context = _clutter_context_get_default ();
return context->keyboard_grab_actor;
}
/**
* clutter_clear_glyph_cache:
*
* Clears the internal cache of glyphs used by the Pango
* renderer. This will free up some memory and GL texture
* resources. The cache will be automatically refilled as more text is
* drawn.
*
* Since: 0.8
*/
void
clutter_clear_glyph_cache (void)
{
CoglPangoFontMap *font_map;
font_map = clutter_context_get_pango_fontmap ();
cogl_pango_font_map_clear_glyph_cache (font_map);
}
/**
* clutter_set_font_flags:
* @flags: The new flags
*
* Sets the font quality options for subsequent text rendering
* operations.
*
* Using mipmapped textures will improve the quality for scaled down
* text but will use more texture memory.
*
* Enabling hinting improves text quality for static text but may
* introduce some artifacts if the text is animated.
*
* Since: 1.0
*/
void
clutter_set_font_flags (ClutterFontFlags flags)
{
ClutterMainContext *context = _clutter_context_get_default ();
CoglPangoFontMap *font_map;
ClutterFontFlags old_flags, changed_flags;
const cairo_font_options_t *font_options;
cairo_font_options_t *new_font_options;
gboolean use_mipmapping;
ClutterBackend *backend;
backend = clutter_get_default_backend ();
font_map = clutter_context_get_pango_fontmap ();
use_mipmapping = (flags & CLUTTER_FONT_MIPMAPPING) != 0;
cogl_pango_font_map_set_use_mipmapping (font_map, use_mipmapping);
old_flags = clutter_get_font_flags ();
font_options = clutter_backend_get_font_options (backend);
new_font_options = cairo_font_options_copy (font_options);
/* Only set the font options that have actually changed so we don't
override a detailed setting from the backend */
changed_flags = old_flags ^ flags;
if ((changed_flags & CLUTTER_FONT_HINTING))
cairo_font_options_set_hint_style (new_font_options,
(flags & CLUTTER_FONT_HINTING)
? CAIRO_HINT_STYLE_FULL
: CAIRO_HINT_STYLE_NONE);
clutter_backend_set_font_options (backend, new_font_options);
cairo_font_options_destroy (new_font_options);
/* update the default pango context, if any */
if (context->pango_context != NULL)
update_pango_context (backend, context->pango_context);
}
/**
* clutter_get_font_flags:
*
* Gets the current font flags for rendering text. See
* clutter_set_font_flags().
*
* Return value: The font flags
*
* Since: 1.0
*/
ClutterFontFlags
clutter_get_font_flags (void)
{
CoglPangoFontMap *font_map = NULL;
const cairo_font_options_t *font_options;
ClutterFontFlags flags = 0;
cairo_hint_style_t hint_style;
font_map = clutter_context_get_pango_fontmap ();
if (cogl_pango_font_map_get_use_mipmapping (font_map))
flags |= CLUTTER_FONT_MIPMAPPING;
font_options =
clutter_backend_get_font_options (clutter_get_default_backend ());
hint_style = cairo_font_options_get_hint_style (font_options);
if (hint_style != CAIRO_HINT_STYLE_DEFAULT &&
hint_style != CAIRO_HINT_STYLE_NONE)
flags |= CLUTTER_FONT_HINTING;
return flags;
}
/**
* clutter_get_input_device_for_id:
* @id_: the unique id for a device
*
* Retrieves the #ClutterInputDevice from its @id_. This is a convenience
* wrapper for clutter_device_manager_get_device() and it is functionally
* equivalent to:
*
* |[
* ClutterDeviceManager *manager;
* ClutterInputDevice *device;
*
* manager = clutter_device_manager_get_default ();
* device = clutter_device_manager_get_device (manager, id);
* ]|
*
* Return value: (transfer none): a #ClutterInputDevice, or %NULL
*
* Since: 0.8
*/
ClutterInputDevice *
clutter_get_input_device_for_id (gint id_)
{
ClutterDeviceManager *manager;
manager = clutter_device_manager_get_default ();
return clutter_device_manager_get_device (manager, id_);
}
/**
* clutter_get_font_map:
*
* Retrieves the #PangoFontMap instance used by Clutter.
* You can use the global font map object with the COGL
* Pango API.
*
* Return value: (transfer none): the #PangoFontMap instance. The returned
* value is owned by Clutter and it should never be unreferenced.
*
* Since: 1.0
*/
PangoFontMap *
clutter_get_font_map (void)
{
return PANGO_FONT_MAP (clutter_context_get_pango_fontmap ());
}
typedef struct _ClutterRepaintFunction
{
guint id;
GSourceFunc func;
gpointer data;
GDestroyNotify notify;
} ClutterRepaintFunction;
/**
* clutter_threads_remove_repaint_func:
* @handle_id: an unsigned integer greater than zero
*
* Removes the repaint function with @handle_id as its id
*
* Since: 1.0
*/
void
clutter_threads_remove_repaint_func (guint handle_id)
{
ClutterRepaintFunction *repaint_func;
ClutterMainContext *context;
GList *l;
g_return_if_fail (handle_id > 0);
context = _clutter_context_get_default ();
l = context->repaint_funcs;
while (l != NULL)
{
repaint_func = l->data;
if (repaint_func->id == handle_id)
{
context->repaint_funcs =
g_list_remove_link (context->repaint_funcs, l);
g_list_free (l);
if (repaint_func->notify)
repaint_func->notify (repaint_func->data);
g_slice_free (ClutterRepaintFunction, repaint_func);
return;
}
l = l->next;
}
}
/**
* clutter_threads_add_repaint_func:
* @func: the function to be called within the paint cycle
* @data: data to be passed to the function, or %NULL
* @notify: function to be called when removing the repaint
* function, or %NULL
*
* Adds a function to be called whenever Clutter is repainting a Stage.
* If the function returns %FALSE it is automatically removed from the
* list of repaint functions and will not be called again.
*
* This function is guaranteed to be called from within the same thread
* that called clutter_main(), and while the Clutter lock is being held.
*
* A repaint function is useful to ensure that an update of the scenegraph
* is performed before the scenegraph is repainted; for instance, uploading
* a frame from a video into a #ClutterTexture.
*
* When the repaint function is removed (either because it returned %FALSE
* or because clutter_threads_remove_repaint_func() has been called) the
* @notify function will be called, if any is set.
*
* Return value: the ID (greater than 0) of the repaint function. You
* can use the returned integer to remove the repaint function by
* calling clutter_threads_remove_repaint_func().
*
* Since: 1.0
*/
guint
clutter_threads_add_repaint_func (GSourceFunc func,
gpointer data,
GDestroyNotify notify)
{
static guint repaint_id = 1;
ClutterMainContext *context;
ClutterRepaintFunction *repaint_func;
g_return_val_if_fail (func != NULL, 0);
context = _clutter_context_get_default ();
/* XXX lock the context */
repaint_func = g_slice_new (ClutterRepaintFunction);
repaint_func->id = repaint_id++;
repaint_func->func = func;
repaint_func->data = data;
repaint_func->notify = notify;
context->repaint_funcs = g_list_prepend (context->repaint_funcs,
repaint_func);
/* XXX unlock the context */
return repaint_func->id;
}
/*
* _clutter_run_repaint_functions:
*
* Executes the repaint functions added using the
* clutter_threads_add_repaint_func() function.
*
* Must be called before calling clutter_redraw() and
* with the Clutter thread lock held.
*/
void
_clutter_run_repaint_functions (void)
{
ClutterMainContext *context = _clutter_context_get_default ();
ClutterRepaintFunction *repaint_func;
GList *reinvoke_list, *l;
if (context->repaint_funcs == NULL)
return;
reinvoke_list = NULL;
/* consume the whole list while we execute the functions */
while (context->repaint_funcs)
{
gboolean res = FALSE;
repaint_func = context->repaint_funcs->data;
l = context->repaint_funcs;
context->repaint_funcs =
g_list_remove_link (context->repaint_funcs, context->repaint_funcs);
g_list_free (l);
res = repaint_func->func (repaint_func->data);
if (res)
reinvoke_list = g_list_prepend (reinvoke_list, repaint_func);
else
{
if (repaint_func->notify)
repaint_func->notify (repaint_func->data);
g_slice_free (ClutterRepaintFunction, repaint_func);
}
}
if (reinvoke_list)
context->repaint_funcs = reinvoke_list;
}
/**
* clutter_check_version:
* @major: major version, like 1 in 1.2.3
* @minor: minor version, like 2 in 1.2.3
* @micro: micro version, like 3 in 1.2.3
*
* Run-time version check, to check the version the Clutter library
* that an application is currently linked against
*
* This is the run-time equivalent of the compile-time %CLUTTER_CHECK_VERSION
* pre-processor macro
*
* Return value: %TRUE if the version of the Clutter library is
* greater than (@major, @minor, @micro), and %FALSE otherwise
*
* Since: 1.2
*/
gboolean
clutter_check_version (guint major,
guint minor,
guint micro)
{
return (clutter_major_version > major ||
(clutter_major_version == major &&
clutter_minor_version > minor) ||
(clutter_major_version == major &&
clutter_minor_version == minor &&
clutter_micro_version >= micro));
}
/**
* clutter_get_default_text_direction:
*
* Retrieves the default direction for the text. The text direction is
* determined by the locale and/or by the %CLUTTER_TEXT_DIRECTION environment
* variable
*
* The default text direction can be overridden on a per-actor basis by using
* clutter_actor_set_text_direction()
*
* Return value: the default text direction
*
* Since: 1.2
*/
ClutterTextDirection
clutter_get_default_text_direction (void)
{
return clutter_text_direction;
}
/*< private >
* clutter_clear_events_queue:
*
* Clears the events queue stored in the main context.
*/
void
_clutter_clear_events_queue (void)
{
ClutterMainContext *context = _clutter_context_get_default ();
if (context->events_queue != NULL)
{
g_queue_foreach (context->events_queue,
(GFunc) clutter_event_free,
NULL);
g_queue_free (context->events_queue);
context->events_queue = NULL;
}
}
guint32
_clutter_context_acquire_id (gpointer key)
{
ClutterMainContext *context = _clutter_context_get_default ();
return _clutter_id_pool_add (context->id_pool, key);
}
void
_clutter_context_release_id (guint32 id_)
{
ClutterMainContext *context = _clutter_context_get_default ();
return _clutter_id_pool_remove (context->id_pool, id_);
}
void
_clutter_clear_events_queue_for_stage (ClutterStage *stage)
{
ClutterMainContext *context = _clutter_context_get_default ();
GList *l, *next;
if (context->events_queue == NULL)
return;
/* Remove any pending events for this stage from the event queue */
for (l = context->events_queue->head; l; l = next)
{
ClutterEvent *event = l->data;
next = l->next;
if (event->any.stage == stage)
{
g_queue_delete_link (context->events_queue, l);
clutter_event_free (event);
}
}
}
ClutterPickMode
_clutter_context_get_pick_mode (void)
{
ClutterMainContext *context = _clutter_context_get_default ();
return context->pick_mode;
}
void
_clutter_context_push_shader_stack (ClutterActor *actor)
{
ClutterMainContext *context = _clutter_context_get_default ();
context->shaders = g_slist_prepend (context->shaders, actor);
}
ClutterActor *
_clutter_context_peek_shader_stack (void)
{
ClutterMainContext *context = _clutter_context_get_default ();
if (context->shaders != NULL)
return context->shaders->data;
return NULL;
}
ClutterActor *
_clutter_context_pop_shader_stack (ClutterActor *actor)
{
ClutterMainContext *context = _clutter_context_get_default ();
context->shaders = g_slist_remove (context->shaders, actor);
return _clutter_context_peek_shader_stack ();
}
gboolean
_clutter_context_get_motion_events_enabled (void)
{
ClutterMainContext *context = _clutter_context_get_default ();
return context->motion_events_per_actor;
}
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