412 lines
13 KiB
C
412 lines
13 KiB
C
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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
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/* Theme node transitions for StWidget.
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*
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* Copyright (C) 2010 Florian Müllner <fmuellner@gnome.org>
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*
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* The St is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* The St 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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with the St; see the file COPYING.LIB.
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* If not, write to the Free Software Foundation, Inc., 59 Temple Place -
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* Suite 330, Boston, MA 02111-1307, USA.
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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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guint8 last_opacity;
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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, so we
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* just cancel 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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&& 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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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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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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priv->offscreen_box.x1 = MIN (old_node_box.x1, new_node_box.x1)
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- allocation->x1;
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priv->offscreen_box.y1 = MIN (old_node_box.y1, new_node_box.y1)
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- allocation->y1;
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priv->offscreen_box.x2 = MAX (old_node_box.x2, new_node_box.x2)
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- allocation->x1;
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priv->offscreen_box.y2 = MAX (old_node_box.y2, new_node_box.y2)
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- allocation->y1;
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}
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static void
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setup_framebuffers (StThemeNodeTransition *transition,
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const 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 clear_color = { 0, 0, 0, 0 };
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guint width, height;
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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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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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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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if (priv->material)
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cogl_handle_unref (priv->material);
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priv->material = cogl_material_new ();
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cogl_material_set_layer_combine (priv->material, 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 (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,
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allocation,
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paint_opacity);
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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,
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allocation,
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paint_opacity);
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cogl_pop_framebuffer ();
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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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guint width, height;
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CoglColor constant = { 0, 0, 0, 0 };
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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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paint_opacity != priv->last_opacity)
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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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priv->last_opacity = paint_opacity;
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calculate_offscreen_box (transition, allocation);
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setup_framebuffers (transition, allocation, paint_opacity);
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priv->needs_setup = FALSE;
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}
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width = cogl_texture_get_width (priv->old_texture);
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height = cogl_texture_get_height (priv->old_texture);
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constant.alpha = clutter_alpha_get_alpha (priv->alpha) * paint_opacity;
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cogl_material_set_layer_combine_constant (priv->material, 1, &constant);
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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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||
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|
transition->priv = ST_THEME_NODE_TRANSITION_GET_PRIVATE (transition);
|
||
|
|
|
||
|
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transition->priv->old_theme_node = NULL;
|
||
|
|
transition->priv->new_theme_node = NULL;
|
||
|
|
|
||
|
|
transition->priv->old_texture = NULL;
|
||
|
|
transition->priv->new_texture = NULL;
|
||
|
|
|
||
|
|
transition->priv->old_offscreen = NULL;
|
||
|
|
transition->priv->new_offscreen = NULL;
|
||
|
|
|
||
|
|
transition->priv->needs_setup = TRUE;
|
||
|
|
|
||
|
|
transition->priv->alpha = NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
st_theme_node_transition_class_init (StThemeNodeTransitionClass *klass)
|
||
|
|
{
|
||
|
|
GObjectClass *object_class = G_OBJECT_CLASS (klass);
|
||
|
|
|
||
|
|
g_type_class_add_private (klass, sizeof (StThemeNodeTransitionPrivate));
|
||
|
|
|
||
|
|
object_class->dispose = st_theme_node_transition_dispose;
|
||
|
|
|
||
|
|
signals[COMPLETED] =
|
||
|
|
g_signal_new ("completed",
|
||
|
|
G_TYPE_FROM_CLASS (klass),
|
||
|
|
G_SIGNAL_RUN_LAST,
|
||
|
|
G_STRUCT_OFFSET (StThemeNodeTransitionClass, completed),
|
||
|
|
NULL, NULL,
|
||
|
|
g_cclosure_marshal_VOID__VOID,
|
||
|
|
G_TYPE_NONE, 0);
|
||
|
|
|
||
|
|
signals[NEW_FRAME] =
|
||
|
|
g_signal_new ("new-frame",
|
||
|
|
G_TYPE_FROM_CLASS (klass),
|
||
|
|
G_SIGNAL_RUN_LAST,
|
||
|
|
G_STRUCT_OFFSET (StThemeNodeTransitionClass, new_frame),
|
||
|
|
NULL, NULL,
|
||
|
|
g_cclosure_marshal_VOID__VOID,
|
||
|
|
G_TYPE_NONE, 0);
|
||
|
|
}
|