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https://github.com/brl/mutter.git
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Store the units-per-em inside the Backend
Instead of recomputing the number of units needed to fit in an em each time clutter_units_em() is called, we can store this value into the default Backend along with the resolution and font name. The value should also be updated each time the resolution and font are changed, to keep it up to date.
This commit is contained in:
Emmanuele Bassi
parent
c5aca39c69
commit
355555c1bf
@ -60,7 +60,8 @@ struct _ClutterBackendPrivate
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guint double_click_time;
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guint double_click_distance;
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ClutterFixed resolution;
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gdouble resolution;
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gdouble units_per_em;
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cairo_font_options_t *font_options;
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@ -87,7 +88,9 @@ clutter_backend_dispose (GObject *gobject)
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if (clutter_context && clutter_context->events_queue)
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{
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g_queue_foreach (clutter_context->events_queue, (GFunc) clutter_event_free, NULL);
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g_queue_foreach (clutter_context->events_queue,
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(GFunc) clutter_event_free,
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NULL);
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g_queue_free (clutter_context->events_queue);
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clutter_context->events_queue = NULL;
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}
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@ -99,6 +102,57 @@ clutter_backend_dispose (GObject *gobject)
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G_OBJECT_CLASS (clutter_backend_parent_class)->dispose (gobject);
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}
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static inline void
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update_units_per_em (ClutterBackend *backend)
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{
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ClutterBackendPrivate *priv = backend->priv;
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const gchar *font_name;
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gdouble dpi;
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font_name = clutter_backend_get_font_name (backend);
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dpi = clutter_backend_get_resolution (backend);
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if (G_LIKELY (font_name != NULL && *font_name != '\0'))
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{
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PangoFontDescription *font_desc;
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gdouble font_size = 0;
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font_desc = pango_font_description_from_string (font_name);
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if (G_LIKELY (font_desc != NULL))
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{
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gint pango_size;
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gboolean is_absolute;
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pango_size = pango_font_description_get_size (font_desc);
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is_absolute =
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pango_font_description_get_size_is_absolute (font_desc);
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if (!is_absolute)
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font_size = ((gdouble) font_size) / PANGO_SCALE;
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pango_font_description_free (font_desc);
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}
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/* 10 points at 96 DPI is 12 pixels */
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priv->units_per_em = 1.2 * font_size
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* dpi
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/ 96.0;
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}
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else
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priv->units_per_em = -1.0;
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}
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static void
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clutter_backend_real_resolution_changed (ClutterBackend *backend)
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{
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update_units_per_em (backend);
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}
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static void
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clutter_backend_real_font_changed (ClutterBackend *backend)
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{
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update_units_per_em (backend);
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}
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static void
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clutter_backend_class_init (ClutterBackendClass *klass)
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{
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@ -111,7 +165,7 @@ clutter_backend_class_init (ClutterBackendClass *klass)
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backend_signals[RESOLUTION_CHANGED] =
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g_signal_new (I_("resolution-changed"),
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G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST,
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G_SIGNAL_RUN_FIRST,
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G_STRUCT_OFFSET (ClutterBackendClass, resolution_changed),
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NULL, NULL,
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clutter_marshal_VOID__VOID,
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@ -120,11 +174,14 @@ clutter_backend_class_init (ClutterBackendClass *klass)
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backend_signals[FONT_CHANGED] =
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g_signal_new (I_("font-changed"),
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G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST,
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G_SIGNAL_RUN_FIRST,
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G_STRUCT_OFFSET (ClutterBackendClass, font_changed),
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NULL, NULL,
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clutter_marshal_VOID__VOID,
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G_TYPE_NONE, 0);
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klass->resolution_changed = clutter_backend_real_resolution_changed;
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klass->font_changed = clutter_backend_real_font_changed;
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}
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static void
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@ -132,8 +189,10 @@ clutter_backend_init (ClutterBackend *backend)
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{
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ClutterBackendPrivate *priv;
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priv = backend->priv = CLUTTER_BACKEND_GET_PRIVATE(backend);
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priv = backend->priv = CLUTTER_BACKEND_GET_PRIVATE (backend);
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priv->resolution = -1.0;
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priv->units_per_em = -1.0;
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}
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void
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@ -289,14 +348,29 @@ _clutter_backend_init_events (ClutterBackend *backend)
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klass->init_events (backend);
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}
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ClutterUnit
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_clutter_backend_get_units_per_em (ClutterBackend *backend)
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{
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ClutterBackendPrivate *priv;
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g_return_val_if_fail (CLUTTER_IS_BACKEND (backend), 0);
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priv = backend->priv;
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if (G_UNLIKELY (priv->units_per_em < 0))
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update_units_per_em (backend);
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return priv->units_per_em;
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}
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/**
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* clutter_get_default_backend:
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*
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* FIXME
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* Retrieves the default #ClutterBackend used by Clutter. The
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* #ClutterBackend holds backend-specific configuration options.
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*
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* Return value: the default backend. You should not ref or
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* unref the returned object. Applications should not rarely need
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* unref the returned object. Applications should rarely need
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* to use this.
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*
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* Since: 0.4
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@ -406,19 +480,16 @@ void
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clutter_backend_set_resolution (ClutterBackend *backend,
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gdouble dpi)
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{
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ClutterFixed fixed_dpi;
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ClutterBackendPrivate *priv;
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g_return_if_fail (CLUTTER_IS_BACKEND (backend));
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priv = backend->priv;
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if (dpi < 0)
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dpi = -1.0;
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priv = backend->priv;
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fixed_dpi = CLUTTER_FLOAT_TO_FIXED (dpi);
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if (priv->resolution != fixed_dpi)
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priv->resolution = fixed_dpi;
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priv->resolution = dpi;
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if (CLUTTER_CONTEXT ()->font_map)
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cogl_pango_font_map_set_resolution (CLUTTER_CONTEXT ()->font_map, dpi);
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@ -443,7 +514,7 @@ clutter_backend_get_resolution (ClutterBackend *backend)
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{
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g_return_val_if_fail (CLUTTER_IS_BACKEND (backend), -1.0);
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return CLUTTER_FIXED_TO_FLOAT (backend->priv->resolution);
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return backend->priv->resolution;
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}
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/**
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@ -194,6 +194,8 @@ void _clutter_backend_init_events (ClutterBackend *backend);
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ClutterFeatureFlags _clutter_backend_get_features (ClutterBackend *backend);
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ClutterUnit _clutter_backend_get_units_per_em (ClutterBackend *backend);
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void _clutter_feature_init (void);
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/* Picking code */
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@ -168,39 +168,10 @@ ClutterUnit
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clutter_units_em (gdouble em)
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{
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ClutterBackend *backend;
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const gchar *font_name;
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gdouble dpi;
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ClutterUnit retval = 0;
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backend = clutter_get_default_backend ();
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dpi = clutter_backend_get_resolution (backend);
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font_name = clutter_backend_get_font_name (backend);
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if (G_LIKELY ((font_name && *font_name != '\0')))
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{
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PangoFontDescription *font_desc;
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gdouble font_size = 0;
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font_desc = pango_font_description_from_string (font_name);
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if (G_LIKELY (font_desc != NULL))
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{
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gint pango_size;
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gboolean is_absolute;
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pango_size = pango_font_description_get_size (font_desc);
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is_absolute =
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pango_font_description_get_size_is_absolute (font_desc);
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if (!is_absolute)
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font_size = ((gdouble) font_size) / PANGO_SCALE;
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pango_font_description_free (font_desc);
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}
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/* 10 points at 96 DPI is 12 pixels */
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retval = 1.2 * font_size * dpi / 96.0;
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}
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return retval;
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return em * _clutter_backend_get_units_per_em (backend);
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}
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static GTypeInfo _info = {
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