gtk2/gtk/gtkcsscomputedvalues.c

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/*
* Copyright © 2012 Red Hat Inc.
*
* 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 2.1 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
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
* Authors: Benjamin Otte <otte@gnome.org>
*/
#include "config.h"
#include "gtkcsscomputedvaluesprivate.h"
#include "gtkcssanimationprivate.h"
#include "gtkcssarrayvalueprivate.h"
#include "gtkcssenumvalueprivate.h"
#include "gtkcssinheritvalueprivate.h"
#include "gtkcssinitialvalueprivate.h"
#include "gtkcssnumbervalueprivate.h"
#include "gtkcssshorthandpropertyprivate.h"
#include "gtkcssstringvalueprivate.h"
#include "gtkcssstylepropertyprivate.h"
#include "gtkcsstransitionprivate.h"
#include "gtkstyleanimationprivate.h"
#include "gtkstylepropertiesprivate.h"
#include "gtkstylepropertyprivate.h"
#include "gtkstyleproviderprivate.h"
G_DEFINE_TYPE (GtkCssComputedValues, _gtk_css_computed_values, G_TYPE_OBJECT)
static void
gtk_css_computed_values_dispose (GObject *object)
{
GtkCssComputedValues *values = GTK_CSS_COMPUTED_VALUES (object);
if (values->values)
{
g_ptr_array_unref (values->values);
values->values = NULL;
}
if (values->sections)
{
g_ptr_array_unref (values->sections);
values->sections = NULL;
}
if (values->animated_values)
{
g_ptr_array_unref (values->animated_values);
values->animated_values = NULL;
}
g_slist_free_full (values->animations, g_object_unref);
values->animations = NULL;
G_OBJECT_CLASS (_gtk_css_computed_values_parent_class)->dispose (object);
}
static void
gtk_css_computed_values_finalize (GObject *object)
{
GtkCssComputedValues *values = GTK_CSS_COMPUTED_VALUES (object);
_gtk_bitmask_free (values->depends_on_parent);
_gtk_bitmask_free (values->equals_parent);
_gtk_bitmask_free (values->depends_on_color);
_gtk_bitmask_free (values->depends_on_font_size);
G_OBJECT_CLASS (_gtk_css_computed_values_parent_class)->finalize (object);
}
static void
_gtk_css_computed_values_class_init (GtkCssComputedValuesClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->dispose = gtk_css_computed_values_dispose;
object_class->finalize = gtk_css_computed_values_finalize;
}
static void
_gtk_css_computed_values_init (GtkCssComputedValues *values)
{
values->depends_on_parent = _gtk_bitmask_new ();
values->equals_parent = _gtk_bitmask_new ();
values->depends_on_color = _gtk_bitmask_new ();
values->depends_on_font_size = _gtk_bitmask_new ();
}
GtkCssComputedValues *
_gtk_css_computed_values_new (void)
{
return g_object_new (GTK_TYPE_CSS_COMPUTED_VALUES, NULL);
}
static void
maybe_unref_section (gpointer section)
{
if (section)
gtk_css_section_unref (section);
}
void
_gtk_css_computed_values_compute_value (GtkCssComputedValues *values,
GtkStyleContext *context,
guint id,
GtkCssValue *specified,
GtkCssSection *section)
{
GtkCssDependencies dependencies;
GtkCssValue *value;
g_return_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values));
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
/* http://www.w3.org/TR/css3-cascade/#cascade
* Then, for every element, the value for each property can be found
* by following this pseudo-algorithm:
* 1) Identify all declarations that apply to the element
*/
if (specified == NULL)
{
GtkCssStyleProperty *prop = _gtk_css_style_property_lookup_by_id (id);
if (_gtk_css_style_property_is_inherit (prop))
specified = _gtk_css_inherit_value_new ();
else
specified = _gtk_css_initial_value_new ();
}
else
_gtk_css_value_ref (specified);
value = _gtk_css_value_compute (specified, id, context, &dependencies);
_gtk_css_computed_values_set_value (values, id, value, dependencies, section);
_gtk_css_value_unref (value);
_gtk_css_value_unref (specified);
}
void
_gtk_css_computed_values_set_animated_value (GtkCssComputedValues *values,
guint id,
GtkCssValue *value)
{
g_return_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values));
g_return_if_fail (value != NULL);
if (values->animated_values == NULL)
values->animated_values = g_ptr_array_new_with_free_func ((GDestroyNotify)_gtk_css_value_unref);
if (id >= values->animated_values->len)
g_ptr_array_set_size (values->animated_values, id + 1);
if (g_ptr_array_index (values->animated_values, id))
_gtk_css_value_unref (g_ptr_array_index (values->animated_values, id));
g_ptr_array_index (values->animated_values, id) = _gtk_css_value_ref (value);
}
void
_gtk_css_computed_values_set_value (GtkCssComputedValues *values,
guint id,
GtkCssValue *value,
GtkCssDependencies dependencies,
GtkCssSection *section)
{
g_return_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values));
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if (values->values == NULL)
values->values = g_ptr_array_new_with_free_func ((GDestroyNotify)_gtk_css_value_unref);
if (id >= values->values->len)
g_ptr_array_set_size (values->values, id + 1);
if (g_ptr_array_index (values->values, id))
_gtk_css_value_unref (g_ptr_array_index (values->values, id));
g_ptr_array_index (values->values, id) = _gtk_css_value_ref (value);
if (dependencies & (GTK_CSS_DEPENDS_ON_PARENT | GTK_CSS_EQUALS_PARENT))
values->depends_on_parent = _gtk_bitmask_set (values->depends_on_parent, id, TRUE);
if (dependencies & (GTK_CSS_EQUALS_PARENT))
values->equals_parent = _gtk_bitmask_set (values->equals_parent, id, TRUE);
if (dependencies & (GTK_CSS_DEPENDS_ON_COLOR))
values->depends_on_color = _gtk_bitmask_set (values->depends_on_color, id, TRUE);
if (dependencies & (GTK_CSS_DEPENDS_ON_FONT_SIZE))
values->depends_on_font_size = _gtk_bitmask_set (values->depends_on_font_size, id, TRUE);
if (section)
{
if (values->sections == NULL)
values->sections = g_ptr_array_new_with_free_func (maybe_unref_section);
if (values->sections->len <= id)
g_ptr_array_set_size (values->sections, id + 1);
g_ptr_array_index (values->sections, id) = gtk_css_section_ref (section);
}
}
GtkCssValue *
_gtk_css_computed_values_get_value (GtkCssComputedValues *values,
guint id)
{
g_return_val_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values), NULL);
if (values->animated_values &&
id < values->animated_values->len &&
g_ptr_array_index (values->animated_values, id))
return g_ptr_array_index (values->animated_values, id);
return _gtk_css_computed_values_get_intrinsic_value (values, id);
}
GtkCssValue *
_gtk_css_computed_values_get_intrinsic_value (GtkCssComputedValues *values,
guint id)
{
g_return_val_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values), NULL);
if (values->values == NULL ||
id >= values->values->len)
return NULL;
return g_ptr_array_index (values->values, id);
}
GtkCssSection *
_gtk_css_computed_values_get_section (GtkCssComputedValues *values,
guint id)
{
g_return_val_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values), NULL);
if (values->sections == NULL ||
id >= values->sections->len)
return NULL;
return g_ptr_array_index (values->sections, id);
}
GtkBitmask *
_gtk_css_computed_values_get_difference (GtkCssComputedValues *values,
GtkCssComputedValues *other)
{
GtkBitmask *result;
guint i, len;
len = MIN (values->values->len, other->values->len);
result = _gtk_bitmask_new ();
if (values->values->len != other->values->len)
result = _gtk_bitmask_invert_range (result, len, MAX (values->values->len, other->values->len));
for (i = 0; i < len; i++)
{
if (!_gtk_css_value_equal (g_ptr_array_index (values->values, i),
g_ptr_array_index (other->values, i)))
result = _gtk_bitmask_set (result, i, TRUE);
}
return result;
}
/* TRANSITIONS */
typedef struct _TransitionInfo TransitionInfo;
struct _TransitionInfo {
guint index; /* index into value arrays */
gboolean pending; /* TRUE if we still need to handle it */
};
static void
transition_info_add (TransitionInfo infos[GTK_CSS_PROPERTY_N_PROPERTIES],
GtkStyleProperty *property,
guint index)
{
if (property == NULL)
{
guint i;
for (i = 0; i < _gtk_css_style_property_get_n_properties (); i++)
{
GtkCssStyleProperty *prop = _gtk_css_style_property_lookup_by_id (i);
transition_info_add (infos, GTK_STYLE_PROPERTY (prop), index);
}
}
else if (GTK_IS_CSS_SHORTHAND_PROPERTY (property))
{
GtkCssShorthandProperty *shorthand = GTK_CSS_SHORTHAND_PROPERTY (property);
guint i;
for (i = 0; i < _gtk_css_shorthand_property_get_n_subproperties (shorthand); i++)
{
GtkCssStyleProperty *prop = _gtk_css_shorthand_property_get_subproperty (shorthand, i);
transition_info_add (infos, GTK_STYLE_PROPERTY (prop), index);
}
}
else if (GTK_IS_CSS_STYLE_PROPERTY (property))
{
guint id;
if (!_gtk_css_style_property_is_animated (GTK_CSS_STYLE_PROPERTY (property)))
return;
id = _gtk_css_style_property_get_id (GTK_CSS_STYLE_PROPERTY (property));
g_assert (id < GTK_CSS_PROPERTY_N_PROPERTIES);
infos[id].index = index;
infos[id].pending = TRUE;
}
else
{
g_assert_not_reached ();
}
}
static void
transition_infos_set (TransitionInfo infos[GTK_CSS_PROPERTY_N_PROPERTIES],
GtkCssValue *transitions)
{
guint i;
for (i = 0; i < _gtk_css_array_value_get_n_values (transitions); i++)
{
GtkStyleProperty *property;
GtkCssValue *prop_value;
prop_value = _gtk_css_array_value_get_nth (transitions, i);
if (g_ascii_strcasecmp (_gtk_css_ident_value_get (prop_value), "all") == 0)
property = NULL;
else
{
property = _gtk_style_property_lookup (_gtk_css_ident_value_get (prop_value));
if (property == NULL)
continue;
}
transition_info_add (infos, property, i);
}
}
static GtkStyleAnimation *
gtk_css_computed_values_find_transition (GtkCssComputedValues *values,
guint property_id)
{
GSList *list;
for (list = values->animations; list; list = list->next)
{
if (!GTK_IS_CSS_TRANSITION (list->data))
continue;
if (_gtk_css_transition_get_property (list->data) == property_id)
return list->data;
}
return NULL;
}
static void
gtk_css_computed_values_create_css_transitions (GtkCssComputedValues *values,
gint64 timestamp,
GtkCssComputedValues *source)
{
TransitionInfo transitions[GTK_CSS_PROPERTY_N_PROPERTIES] = { { 0, } };
GtkCssValue *durations, *delays, *timing_functions;
guint i;
transition_infos_set (transitions, _gtk_css_computed_values_get_value (values, GTK_CSS_PROPERTY_TRANSITION_PROPERTY));
durations = _gtk_css_computed_values_get_value (values, GTK_CSS_PROPERTY_TRANSITION_DURATION);
delays = _gtk_css_computed_values_get_value (values, GTK_CSS_PROPERTY_TRANSITION_DELAY);
timing_functions = _gtk_css_computed_values_get_value (values, GTK_CSS_PROPERTY_TRANSITION_TIMING_FUNCTION);
for (i = 0; i < GTK_CSS_PROPERTY_N_PROPERTIES; i++)
{
GtkStyleAnimation *animation;
GtkCssValue *start, *end;
double duration, delay;
if (!transitions[i].pending)
continue;
duration = _gtk_css_number_value_get (_gtk_css_array_value_get_nth (durations, transitions[i].index), 100);
delay = _gtk_css_number_value_get (_gtk_css_array_value_get_nth (delays, transitions[i].index), 100);
if (duration + delay == 0.0)
continue;
start = _gtk_css_computed_values_get_intrinsic_value (source, i);
end = _gtk_css_computed_values_get_intrinsic_value (values, i);
if (_gtk_css_value_equal (start, end))
{
animation = gtk_css_computed_values_find_transition (GTK_CSS_COMPUTED_VALUES (source), i);
if (animation)
values->animations = g_slist_prepend (values->animations, g_object_ref (animation));
}
else
{
animation = _gtk_css_transition_new (i,
start,
end,
_gtk_css_array_value_get_nth (timing_functions, i),
timestamp + delay * G_USEC_PER_SEC,
timestamp + (delay + duration) * G_USEC_PER_SEC);
values->animations = g_slist_prepend (values->animations, animation);
}
}
}
static GtkStyleAnimation *
gtk_css_computed_values_find_animation (GtkCssComputedValues *values,
const char *name)
{
GSList *list;
for (list = values->animations; list; list = list->next)
{
if (!GTK_IS_CSS_ANIMATION (list->data))
continue;
if (g_str_equal (_gtk_css_animation_get_name (list->data), name))
return list->data;
}
return NULL;
}
static void
gtk_css_computed_values_create_css_animations (GtkCssComputedValues *values,
gint64 timestamp,
GtkCssComputedValues *source,
GtkStyleContext *context)
{
GtkStyleProviderPrivate *provider;
GtkCssValue *durations, *delays, *timing_functions, *animations;
GtkCssValue *iteration_counts, *directions, *play_states, *fill_modes;
guint i;
provider = _gtk_style_context_get_style_provider (context);
animations = _gtk_css_computed_values_get_value (values, GTK_CSS_PROPERTY_ANIMATION_NAME);
durations = _gtk_css_computed_values_get_value (values, GTK_CSS_PROPERTY_ANIMATION_DURATION);
delays = _gtk_css_computed_values_get_value (values, GTK_CSS_PROPERTY_ANIMATION_DELAY);
timing_functions = _gtk_css_computed_values_get_value (values, GTK_CSS_PROPERTY_ANIMATION_TIMING_FUNCTION);
iteration_counts = _gtk_css_computed_values_get_value (values, GTK_CSS_PROPERTY_ANIMATION_ITERATION_COUNT);
directions = _gtk_css_computed_values_get_value (values, GTK_CSS_PROPERTY_ANIMATION_DIRECTION);
play_states = _gtk_css_computed_values_get_value (values, GTK_CSS_PROPERTY_ANIMATION_PLAY_STATE);
fill_modes = _gtk_css_computed_values_get_value (values, GTK_CSS_PROPERTY_ANIMATION_FILL_MODE);
for (i = 0; i < _gtk_css_array_value_get_n_values (animations); i++)
{
GtkStyleAnimation *animation;
GtkCssKeyframes *keyframes;
const char *name;
name = _gtk_css_ident_value_get (_gtk_css_array_value_get_nth (animations, i));
if (g_ascii_strcasecmp (name, "none") == 0)
continue;
animation = gtk_css_computed_values_find_animation (values, name);
if (animation)
continue;
if (source)
animation = gtk_css_computed_values_find_animation (source, name);
if (animation)
{
animation = _gtk_css_animation_copy (GTK_CSS_ANIMATION (animation),
timestamp,
_gtk_css_play_state_value_get (_gtk_css_array_value_get_nth (play_states, i)));
}
else
{
keyframes = _gtk_style_provider_private_get_keyframes (provider, name);
if (keyframes == NULL)
continue;
keyframes = _gtk_css_keyframes_compute (keyframes, context);
animation = _gtk_css_animation_new (name,
keyframes,
timestamp,
_gtk_css_number_value_get (_gtk_css_array_value_get_nth (delays, i), 100) * G_USEC_PER_SEC,
_gtk_css_number_value_get (_gtk_css_array_value_get_nth (durations, i), 100) * G_USEC_PER_SEC,
_gtk_css_array_value_get_nth (timing_functions, i),
_gtk_css_direction_value_get (_gtk_css_array_value_get_nth (directions, i)),
_gtk_css_play_state_value_get (_gtk_css_array_value_get_nth (play_states, i)),
_gtk_css_fill_mode_value_get (_gtk_css_array_value_get_nth (fill_modes, i)),
_gtk_css_number_value_get (_gtk_css_array_value_get_nth (iteration_counts, i), 100));
}
values->animations = g_slist_prepend (values->animations, animation);
}
}
/* PUBLIC API */
void
_gtk_css_computed_values_create_animations (GtkCssComputedValues *values,
gint64 timestamp,
GtkCssComputedValues *source,
GtkStyleContext *context)
{
if (source != NULL)
gtk_css_computed_values_create_css_transitions (values, timestamp, source);
gtk_css_computed_values_create_css_animations (values, timestamp, source, context);
}
GtkBitmask *
_gtk_css_computed_values_advance (GtkCssComputedValues *values,
gint64 timestamp)
{
GtkBitmask *changed;
GPtrArray *old_computed_values;
GSList *list;
guint i;
g_return_val_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values), NULL);
g_return_val_if_fail (timestamp >= values->current_time, NULL);
values->current_time = timestamp;
old_computed_values = values->animated_values;
values->animated_values = NULL;
list = values->animations;
while (list)
{
GtkStyleAnimation *animation = list->data;
list = list->next;
_gtk_style_animation_set_values (animation,
timestamp,
GTK_CSS_COMPUTED_VALUES (values));
if (_gtk_style_animation_is_finished (animation, timestamp))
{
values->animations = g_slist_remove (values->animations, animation);
g_object_unref (animation);
}
}
/* figure out changes */
changed = _gtk_bitmask_new ();
for (i = 0; i < GTK_CSS_PROPERTY_N_PROPERTIES; i++)
{
GtkCssValue *old_animated, *new_animated;
old_animated = old_computed_values && i < old_computed_values->len ? g_ptr_array_index (old_computed_values, i) : NULL;
new_animated = values->animated_values && i < values->animated_values->len ? g_ptr_array_index (values->animated_values, i) : NULL;
if (!_gtk_css_value_equal0 (old_animated, new_animated))
changed = _gtk_bitmask_set (changed, i, TRUE);
}
if (old_computed_values)
g_ptr_array_unref (old_computed_values);
return changed;
}
gboolean
_gtk_css_computed_values_is_static (GtkCssComputedValues *values)
{
GSList *list;
g_return_val_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values), TRUE);
for (list = values->animations; list; list = list->next)
{
if (!_gtk_style_animation_is_static (list->data, values->current_time))
return FALSE;
}
return TRUE;
}
void
_gtk_css_computed_values_cancel_animations (GtkCssComputedValues *values)
{
g_return_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values));
if (values->animated_values)
{
g_ptr_array_unref (values->animated_values);
values->animated_values = NULL;
}
g_slist_free_full (values->animations, g_object_unref);
values->animations = NULL;
}