257 lines
8.1 KiB
C
257 lines
8.1 KiB
C
/*
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* Copyright © 2012 Red Hat Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* 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/>.
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*
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* Authors: Benjamin Otte <otte@gnome.org>
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*/
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#include "config.h"
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#include "gtkcssanimationprivate.h"
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#include "gtkcsseasevalueprivate.h"
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#include <math.h>
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G_DEFINE_TYPE (GtkCssAnimation, _gtk_css_animation, GTK_TYPE_STYLE_ANIMATION)
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/* NB: Return value can be negative (if animation hasn't started yet) */
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static gint64
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gtk_css_animation_get_elapsed (GtkCssAnimation *animation,
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gint64 for_time_us)
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{
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if (animation->play_state == GTK_CSS_PLAY_STATE_PAUSED)
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return animation->timestamp;
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else
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return for_time_us - animation->timestamp;
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}
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/* NB: Return value can be negative and +-Inf */
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static double
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gtk_css_animation_get_iteration (GtkCssAnimation *animation,
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gint64 for_time_us)
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{
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return (double) gtk_css_animation_get_elapsed (animation, for_time_us) / animation->duration;
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}
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static gboolean
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gtk_css_animation_is_executing_at_iteration (GtkCssAnimation *animation,
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double iteration)
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{
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switch (animation->fill_mode)
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{
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case GTK_CSS_FILL_NONE:
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return iteration >= 0 && iteration <= animation->iteration_count;
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case GTK_CSS_FILL_FORWARDS:
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return iteration >= 0;
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case GTK_CSS_FILL_BACKWARDS:
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return iteration <= animation->iteration_count;
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case GTK_CSS_FILL_BOTH:
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return TRUE;
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default:
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g_return_val_if_reached (FALSE);
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}
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}
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static double
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gtk_css_animation_get_progress_from_iteration (GtkCssAnimation *animation,
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double iteration)
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{
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double d;
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iteration = CLAMP (iteration, 0, animation->iteration_count);
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switch (animation->direction)
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{
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case GTK_CSS_DIRECTION_NORMAL:
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if (iteration == animation->iteration_count)
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return 1;
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else
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return iteration - floor (iteration);
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case GTK_CSS_DIRECTION_REVERSE:
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if (iteration == animation->iteration_count)
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return 1;
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else
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return ceil (iteration) - iteration;
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case GTK_CSS_DIRECTION_ALTERNATE:
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d = floor (iteration);
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if (fmod (d, 2))
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return iteration - d;
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else
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return 1 + d - iteration;
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case GTK_CSS_DIRECTION_ALTERNATE_REVERSE:
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d = floor (iteration);
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if (fmod (d, 2))
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return 1 + d - iteration;
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else
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return iteration - d;
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default:
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g_return_val_if_reached (0);
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}
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}
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static void
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gtk_css_animation_set_values (GtkStyleAnimation *style_animation,
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gint64 for_time_us,
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GtkCssComputedValues *values)
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{
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GtkCssAnimation *animation = GTK_CSS_ANIMATION (style_animation);
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double iteration, progress;
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guint i;
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iteration = gtk_css_animation_get_iteration (animation, for_time_us);
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if (!gtk_css_animation_is_executing_at_iteration (animation, iteration))
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return;
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progress = gtk_css_animation_get_progress_from_iteration (animation, iteration);
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progress = _gtk_css_ease_value_transform (animation->ease, progress);
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for (i = 0; i < _gtk_css_keyframes_get_n_properties (animation->keyframes); i++)
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{
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GtkCssValue *value;
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guint property_id;
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property_id = _gtk_css_keyframes_get_property_id (animation->keyframes, i);
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value = _gtk_css_keyframes_get_value (animation->keyframes,
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i,
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progress,
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_gtk_css_computed_values_get_intrinsic_value (values, property_id));
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_gtk_css_computed_values_set_animated_value (values, property_id, value);
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_gtk_css_value_unref (value);
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}
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}
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static gboolean
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gtk_css_animation_is_finished (GtkStyleAnimation *style_animation,
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gint64 at_time_us)
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{
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return FALSE;
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}
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static gboolean
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gtk_css_animation_is_static (GtkStyleAnimation *style_animation,
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gint64 at_time_us)
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{
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GtkCssAnimation *animation = GTK_CSS_ANIMATION (style_animation);
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double iteration;
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if (animation->play_state == GTK_CSS_PLAY_STATE_PAUSED)
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return TRUE;
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iteration = gtk_css_animation_get_iteration (animation, at_time_us);
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return iteration >= animation->iteration_count;
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}
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static void
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gtk_css_animation_finalize (GObject *object)
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{
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GtkCssAnimation *animation = GTK_CSS_ANIMATION (object);
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g_free (animation->name);
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_gtk_css_keyframes_unref (animation->keyframes);
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_gtk_css_value_unref (animation->ease);
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G_OBJECT_CLASS (_gtk_css_animation_parent_class)->finalize (object);
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}
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static void
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_gtk_css_animation_class_init (GtkCssAnimationClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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GtkStyleAnimationClass *animation_class = GTK_STYLE_ANIMATION_CLASS (klass);
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object_class->finalize = gtk_css_animation_finalize;
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animation_class->set_values = gtk_css_animation_set_values;
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animation_class->is_finished = gtk_css_animation_is_finished;
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animation_class->is_static = gtk_css_animation_is_static;
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}
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static void
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_gtk_css_animation_init (GtkCssAnimation *animation)
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{
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}
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GtkStyleAnimation *
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_gtk_css_animation_new (const char *name,
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GtkCssKeyframes *keyframes,
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gint64 timestamp,
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gint64 delay_us,
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gint64 duration_us,
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GtkCssValue *ease,
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GtkCssDirection direction,
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GtkCssPlayState play_state,
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GtkCssFillMode fill_mode,
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double iteration_count)
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{
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GtkCssAnimation *animation;
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g_return_val_if_fail (name != NULL, NULL);
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g_return_val_if_fail (keyframes != NULL, NULL);
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g_return_val_if_fail (ease != NULL, NULL);
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g_return_val_if_fail (iteration_count >= 0, NULL);
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animation = g_object_new (GTK_TYPE_CSS_ANIMATION, NULL);
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animation->name = g_strdup (name);
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animation->keyframes = _gtk_css_keyframes_ref (keyframes);
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if (play_state == GTK_CSS_PLAY_STATE_PAUSED)
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animation->timestamp = - delay_us;
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else
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animation->timestamp = timestamp + delay_us;
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animation->duration = duration_us;
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animation->ease = _gtk_css_value_ref (ease);
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animation->direction = direction;
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animation->play_state = play_state;
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animation->fill_mode = fill_mode;
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animation->iteration_count = iteration_count;
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return GTK_STYLE_ANIMATION (animation);
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}
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const char *
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_gtk_css_animation_get_name (GtkCssAnimation *animation)
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{
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g_return_val_if_fail (GTK_IS_CSS_ANIMATION (animation), NULL);
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return animation->name;
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}
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GtkStyleAnimation *
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_gtk_css_animation_copy (GtkCssAnimation *animation,
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gint64 at_time_us,
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GtkCssPlayState play_state)
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{
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g_return_val_if_fail (GTK_IS_CSS_ANIMATION (animation), NULL);
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if (animation->play_state == play_state)
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return g_object_ref (animation);
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return _gtk_css_animation_new (animation->name,
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animation->keyframes,
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at_time_us,
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- gtk_css_animation_get_elapsed (animation, at_time_us),
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animation->duration,
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animation->ease,
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animation->direction,
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play_state,
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animation->fill_mode,
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animation->iteration_count);
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}
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