468 lines
15 KiB
C
468 lines
15 KiB
C
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
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/*
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* st-theme-node-transition.c: Theme node transitions for StWidget.
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*
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* Copyright 2010 Florian Müllner
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* Copyright 2010 Adel Gadllah
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation, either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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* more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "st-theme-node-transition.h"
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enum {
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COMPLETED,
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NEW_FRAME,
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LAST_SIGNAL
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};
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#define ST_THEME_NODE_TRANSITION_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), ST_TYPE_THEME_NODE_TRANSITION, StThemeNodeTransitionPrivate))
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struct _StThemeNodeTransitionPrivate {
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StThemeNode *old_theme_node;
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StThemeNode *new_theme_node;
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CoglHandle old_texture;
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CoglHandle new_texture;
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CoglHandle old_offscreen;
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CoglHandle new_offscreen;
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CoglHandle material;
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ClutterAlpha *alpha;
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ClutterTimeline *timeline;
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guint timeline_completed_id;
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guint timeline_new_frame_id;
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ClutterActorBox last_allocation;
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ClutterActorBox offscreen_box;
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gboolean needs_setup;
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};
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static guint signals[LAST_SIGNAL] = { 0 };
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G_DEFINE_TYPE (StThemeNodeTransition, st_theme_node_transition, G_TYPE_OBJECT);
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static void
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on_timeline_completed (ClutterTimeline *timeline,
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StThemeNodeTransition *transition)
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{
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g_signal_emit (transition, signals[COMPLETED], 0);
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}
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static void
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on_timeline_new_frame (ClutterTimeline *timeline,
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gint frame_num,
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StThemeNodeTransition *transition)
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{
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g_signal_emit (transition, signals[NEW_FRAME], 0);
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}
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StThemeNodeTransition *
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st_theme_node_transition_new (StThemeNode *from_node,
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StThemeNode *to_node,
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guint duration)
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{
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StThemeNodeTransition *transition;
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g_return_val_if_fail (ST_IS_THEME_NODE (from_node), NULL);
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g_return_val_if_fail (ST_IS_THEME_NODE (to_node), NULL);
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duration = st_theme_node_get_transition_duration (to_node);
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transition = g_object_new (ST_TYPE_THEME_NODE_TRANSITION,
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NULL);
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transition->priv->old_theme_node = g_object_ref (from_node);
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transition->priv->new_theme_node = g_object_ref (to_node);
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transition->priv->alpha = clutter_alpha_new ();
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transition->priv->timeline = clutter_timeline_new (duration);
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transition->priv->timeline_completed_id =
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g_signal_connect (transition->priv->timeline, "completed",
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G_CALLBACK (on_timeline_completed), transition);
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transition->priv->timeline_new_frame_id =
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g_signal_connect (transition->priv->timeline, "new-frame",
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G_CALLBACK (on_timeline_new_frame), transition);
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clutter_alpha_set_mode (transition->priv->alpha, CLUTTER_EASE_IN_OUT_QUAD);
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clutter_alpha_set_timeline (transition->priv->alpha,
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transition->priv->timeline);
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clutter_timeline_start (transition->priv->timeline);
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return transition;
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}
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void
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st_theme_node_transition_update (StThemeNodeTransition *transition,
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StThemeNode *new_node)
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{
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StThemeNodeTransitionPrivate *priv = transition->priv;
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StThemeNode *old_node;
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ClutterTimelineDirection direction;
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g_return_if_fail (ST_IS_THEME_NODE_TRANSITION (transition));
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g_return_if_fail (ST_IS_THEME_NODE (new_node));
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direction = clutter_timeline_get_direction (priv->timeline);
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old_node = (direction == CLUTTER_TIMELINE_FORWARD) ? priv->old_theme_node
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: priv->new_theme_node;
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/* If the update is the reversal of the current transition,
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* we reverse the timeline.
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* Otherwise, we should initiate a new transition from the
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* current state to the new one; this is hard to do if the
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* transition is in an intermediate state, so we just cancel
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* the ongoing transition in that case.
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* Note that reversing a timeline before any time elapsed
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* results in the timeline's time position being set to the
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* full duration - this is not what we want, so we cancel the
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* transition as well in that case.
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*/
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if (st_theme_node_equal (new_node, old_node))
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{
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if (clutter_timeline_get_elapsed_time (priv->timeline) > 0)
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{
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if (direction == CLUTTER_TIMELINE_FORWARD)
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clutter_timeline_set_direction (priv->timeline,
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CLUTTER_TIMELINE_BACKWARD);
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else
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clutter_timeline_set_direction (priv->timeline,
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CLUTTER_TIMELINE_FORWARD);
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}
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else
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{
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clutter_timeline_stop (priv->timeline);
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g_signal_emit (transition, signals[COMPLETED], 0);
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}
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}
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else
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{
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if (clutter_timeline_get_elapsed_time (priv->timeline) > 0)
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{
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clutter_timeline_stop (priv->timeline);
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g_signal_emit (transition, signals[COMPLETED], 0);
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}
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else
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{
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guint new_duration = st_theme_node_get_transition_duration (new_node);
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clutter_timeline_set_duration (priv->timeline, new_duration);
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/* If the change doesn't affect painting, we don't need to redraw,
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* but we still need to replace the node so that we properly share
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* caching with the painting that happens after the transition finishes.
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*/
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if (!st_theme_node_paint_equal (priv->new_theme_node, new_node))
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priv->needs_setup = TRUE;
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g_object_unref (priv->new_theme_node);
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priv->new_theme_node = g_object_ref (new_node);
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}
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}
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}
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static void
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calculate_offscreen_box (StThemeNodeTransition *transition,
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const ClutterActorBox *allocation)
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{
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ClutterActorBox paint_box;
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st_theme_node_transition_get_paint_box (transition,
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allocation,
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&paint_box);
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transition->priv->offscreen_box.x1 = paint_box.x1 - allocation->x1;
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transition->priv->offscreen_box.y1 = paint_box.y1 - allocation->y1;
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transition->priv->offscreen_box.x2 = paint_box.x2 - allocation->x1;
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transition->priv->offscreen_box.y2 = paint_box.y2 - allocation->y1;
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}
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void
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st_theme_node_transition_get_paint_box (StThemeNodeTransition *transition,
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const ClutterActorBox *allocation,
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ClutterActorBox *paint_box)
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{
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StThemeNodeTransitionPrivate *priv = transition->priv;
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ClutterActorBox old_node_box, new_node_box;
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st_theme_node_get_paint_box (priv->old_theme_node,
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allocation,
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&old_node_box);
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st_theme_node_get_paint_box (priv->new_theme_node,
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allocation,
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&new_node_box);
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paint_box->x1 = MIN (old_node_box.x1, new_node_box.x1);
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paint_box->y1 = MIN (old_node_box.y1, new_node_box.y1);
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paint_box->x2 = MAX (old_node_box.x2, new_node_box.x2);
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paint_box->y2 = MAX (old_node_box.y2, new_node_box.y2);
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}
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static gboolean
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setup_framebuffers (StThemeNodeTransition *transition,
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const ClutterActorBox *allocation)
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{
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StThemeNodeTransitionPrivate *priv = transition->priv;
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CoglColor clear_color = { 0, 0, 0, 0 };
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guint width, height;
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/* template material to avoid unnecessary shader compilation */
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static CoglHandle material_template = COGL_INVALID_HANDLE;
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width = priv->offscreen_box.x2 - priv->offscreen_box.x1;
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height = priv->offscreen_box.y2 - priv->offscreen_box.y1;
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g_return_val_if_fail (width > 0, FALSE);
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g_return_val_if_fail (height > 0, FALSE);
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if (priv->old_texture)
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cogl_handle_unref (priv->old_texture);
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priv->old_texture = cogl_texture_new_with_size (width, height,
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COGL_TEXTURE_NO_SLICING,
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COGL_PIXEL_FORMAT_ANY);
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if (priv->new_texture)
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cogl_handle_unref (priv->new_texture);
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priv->new_texture = cogl_texture_new_with_size (width, height,
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COGL_TEXTURE_NO_SLICING,
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COGL_PIXEL_FORMAT_ANY);
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g_return_val_if_fail (priv->old_texture != COGL_INVALID_HANDLE, FALSE);
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g_return_val_if_fail (priv->new_texture != COGL_INVALID_HANDLE, FALSE);
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if (priv->old_offscreen)
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cogl_handle_unref (priv->old_offscreen);
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priv->old_offscreen = cogl_offscreen_new_to_texture (priv->old_texture);
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if (priv->new_offscreen)
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cogl_handle_unref (priv->new_offscreen);
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priv->new_offscreen = cogl_offscreen_new_to_texture (priv->new_texture);
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g_return_val_if_fail (priv->old_offscreen != COGL_INVALID_HANDLE, FALSE);
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g_return_val_if_fail (priv->new_offscreen != COGL_INVALID_HANDLE, FALSE);
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if (priv->material == NULL)
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{
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if (G_UNLIKELY (material_template == COGL_INVALID_HANDLE))
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{
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material_template = cogl_material_new ();
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cogl_material_set_layer_combine (material_template, 0,
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"RGBA = REPLACE (TEXTURE)",
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NULL);
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cogl_material_set_layer_combine (material_template, 1,
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"RGBA = INTERPOLATE (PREVIOUS, "
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"TEXTURE, "
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"CONSTANT[A])",
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NULL);
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cogl_material_set_layer_combine (material_template, 2,
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"RGBA = MODULATE (PREVIOUS, "
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"PRIMARY)",
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NULL);
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}
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priv->material = cogl_material_copy (material_template);
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}
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cogl_material_set_layer (priv->material, 0, priv->new_texture);
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cogl_material_set_layer (priv->material, 1, priv->old_texture);
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cogl_push_framebuffer (priv->old_offscreen);
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cogl_clear (&clear_color, COGL_BUFFER_BIT_COLOR);
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cogl_ortho (priv->offscreen_box.x1, priv->offscreen_box.x2,
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priv->offscreen_box.y2, priv->offscreen_box.y1,
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0.0, 1.0);
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st_theme_node_paint (priv->old_theme_node, allocation, 255);
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cogl_pop_framebuffer ();
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cogl_push_framebuffer (priv->new_offscreen);
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cogl_clear (&clear_color, COGL_BUFFER_BIT_COLOR);
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cogl_ortho (priv->offscreen_box.x1, priv->offscreen_box.x2,
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priv->offscreen_box.y2, priv->offscreen_box.y1,
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0.0, 1.0);
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st_theme_node_paint (priv->new_theme_node, allocation, 255);
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cogl_pop_framebuffer ();
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return TRUE;
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}
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void
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st_theme_node_transition_paint (StThemeNodeTransition *transition,
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ClutterActorBox *allocation,
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guint8 paint_opacity)
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{
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StThemeNodeTransitionPrivate *priv = transition->priv;
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CoglColor constant;
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float tex_coords[] = {
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0.0, 0.0, 1.0, 1.0,
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0.0, 0.0, 1.0, 1.0,
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};
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g_return_if_fail (ST_IS_THEME_NODE (priv->old_theme_node));
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g_return_if_fail (ST_IS_THEME_NODE (priv->new_theme_node));
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if (!clutter_actor_box_equal (allocation, &priv->last_allocation))
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priv->needs_setup = TRUE;
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if (priv->needs_setup)
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{
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priv->last_allocation = *allocation;
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calculate_offscreen_box (transition, allocation);
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priv->needs_setup = !setup_framebuffers (transition, allocation);
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if (priv->needs_setup) /* setting up framebuffers failed */
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return;
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}
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cogl_color_set_from_4f (&constant, 0., 0., 0.,
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clutter_alpha_get_alpha (priv->alpha));
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cogl_material_set_layer_combine_constant (priv->material, 1, &constant);
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cogl_material_set_color4ub (priv->material,
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paint_opacity, paint_opacity,
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paint_opacity, paint_opacity);
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cogl_set_source (priv->material);
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cogl_rectangle_with_multitexture_coords (priv->offscreen_box.x1,
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priv->offscreen_box.y1,
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priv->offscreen_box.x2,
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priv->offscreen_box.y2,
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tex_coords, 8);
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}
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static void
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st_theme_node_transition_dispose (GObject *object)
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{
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StThemeNodeTransitionPrivate *priv = ST_THEME_NODE_TRANSITION (object)->priv;
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if (priv->old_theme_node)
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{
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g_object_unref (priv->old_theme_node);
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priv->old_theme_node = NULL;
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}
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if (priv->new_theme_node)
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{
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g_object_unref (priv->new_theme_node);
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priv->new_theme_node = NULL;
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}
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if (priv->old_texture)
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{
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cogl_handle_unref (priv->old_texture);
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priv->old_texture = NULL;
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}
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if (priv->new_texture)
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{
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cogl_handle_unref (priv->new_texture);
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priv->new_texture = NULL;
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}
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if (priv->old_offscreen)
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{
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cogl_handle_unref (priv->old_offscreen);
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priv->old_offscreen = NULL;
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}
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if (priv->new_offscreen)
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{
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cogl_handle_unref (priv->new_offscreen);
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priv->new_offscreen = NULL;
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}
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if (priv->material)
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{
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cogl_handle_unref (priv->material);
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priv->material = NULL;
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}
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if (priv->timeline)
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{
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if (priv->timeline_completed_id != 0)
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g_signal_handler_disconnect (priv->timeline,
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priv->timeline_completed_id);
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if (priv->timeline_new_frame_id != 0)
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g_signal_handler_disconnect (priv->timeline,
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priv->timeline_new_frame_id);
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g_object_unref (priv->timeline);
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priv->timeline = NULL;
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}
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priv->timeline_completed_id = 0;
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priv->timeline_new_frame_id = 0;
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if (priv->alpha)
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{
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g_object_unref (priv->alpha);
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priv->alpha = NULL;
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}
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G_OBJECT_CLASS (st_theme_node_transition_parent_class)->dispose (object);
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}
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static void
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st_theme_node_transition_init (StThemeNodeTransition *transition)
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{
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transition->priv = ST_THEME_NODE_TRANSITION_GET_PRIVATE (transition);
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transition->priv->old_theme_node = NULL;
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transition->priv->new_theme_node = NULL;
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transition->priv->old_texture = NULL;
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transition->priv->new_texture = NULL;
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transition->priv->old_offscreen = NULL;
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transition->priv->new_offscreen = NULL;
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transition->priv->needs_setup = TRUE;
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transition->priv->alpha = NULL;
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}
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static void
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st_theme_node_transition_class_init (StThemeNodeTransitionClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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g_type_class_add_private (klass, sizeof (StThemeNodeTransitionPrivate));
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object_class->dispose = st_theme_node_transition_dispose;
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signals[COMPLETED] =
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g_signal_new ("completed",
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G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (StThemeNodeTransitionClass, completed),
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NULL, NULL, NULL,
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G_TYPE_NONE, 0);
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signals[NEW_FRAME] =
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g_signal_new ("new-frame",
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G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (StThemeNodeTransitionClass, new_frame),
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NULL, NULL, NULL,
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G_TYPE_NONE, 0);
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}
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