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-rw-r--r--src/st/st-theme-node-transition.c469
1 files changed, 469 insertions, 0 deletions
diff --git a/src/st/st-theme-node-transition.c b/src/st/st-theme-node-transition.c
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+++ b/src/st/st-theme-node-transition.c
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+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+/*
+ * st-theme-node-transition.c: Theme node transitions for StWidget.
+ *
+ * Copyright 2010 Florian Müllner
+ * Copyright 2010 Adel Gadllah
+ *
+ * This program 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 program is distributed in the hope 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 License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <math.h>
+
+#include "st-theme-node-transition.h"
+
+enum {
+ COMPLETED,
+ NEW_FRAME,
+ LAST_SIGNAL
+};
+
+typedef struct _StThemeNodeTransitionPrivate StThemeNodeTransitionPrivate;
+
+struct _StThemeNodeTransition {
+ GObject parent;
+
+ StThemeNodeTransitionPrivate *priv;
+};
+
+struct _StThemeNodeTransitionPrivate {
+ StThemeNode *old_theme_node;
+ StThemeNode *new_theme_node;
+
+ StThemeNodePaintState old_paint_state;
+ StThemeNodePaintState new_paint_state;
+
+ CoglTexture *old_texture;
+ CoglTexture *new_texture;
+
+ CoglFramebuffer *old_offscreen;
+ CoglFramebuffer *new_offscreen;
+
+ CoglPipeline *material;
+
+ ClutterTimeline *timeline;
+
+ gulong timeline_completed_id;
+ gulong timeline_new_frame_id;
+
+ ClutterActorBox last_allocation;
+ ClutterActorBox offscreen_box;
+
+ gboolean needs_setup;
+};
+
+static guint signals[LAST_SIGNAL] = { 0 };
+
+G_DEFINE_TYPE_WITH_PRIVATE (StThemeNodeTransition, st_theme_node_transition, G_TYPE_OBJECT);
+
+
+static void
+on_timeline_completed (ClutterTimeline *timeline,
+ StThemeNodeTransition *transition)
+{
+ g_signal_emit (transition, signals[COMPLETED], 0);
+}
+
+static void
+on_timeline_new_frame (ClutterTimeline *timeline,
+ gint frame_num,
+ StThemeNodeTransition *transition)
+{
+ g_signal_emit (transition, signals[NEW_FRAME], 0);
+}
+
+StThemeNodeTransition *
+st_theme_node_transition_new (ClutterActor *actor,
+ StThemeNode *from_node,
+ StThemeNode *to_node,
+ StThemeNodePaintState *old_paint_state,
+ unsigned int duration)
+{
+ StThemeNodeTransition *transition;
+ g_return_val_if_fail (ST_IS_THEME_NODE (from_node), NULL);
+ g_return_val_if_fail (ST_IS_THEME_NODE (to_node), NULL);
+
+ duration = st_theme_node_get_transition_duration (to_node);
+
+ transition = g_object_new (ST_TYPE_THEME_NODE_TRANSITION, NULL);
+
+ transition->priv->old_theme_node = g_object_ref (from_node);
+ transition->priv->new_theme_node = g_object_ref (to_node);
+
+ st_theme_node_paint_state_copy (&transition->priv->old_paint_state,
+ old_paint_state);
+
+ transition->priv->timeline = clutter_timeline_new_for_actor (actor, duration);
+
+ transition->priv->timeline_completed_id =
+ g_signal_connect (transition->priv->timeline, "completed",
+ G_CALLBACK (on_timeline_completed), transition);
+ transition->priv->timeline_new_frame_id =
+ g_signal_connect (transition->priv->timeline, "new-frame",
+ G_CALLBACK (on_timeline_new_frame), transition);
+
+ clutter_timeline_set_progress_mode (transition->priv->timeline, CLUTTER_EASE_IN_OUT_QUAD);
+
+ clutter_timeline_start (transition->priv->timeline);
+
+ return transition;
+}
+
+/**
+ * st_theme_node_transition_get_new_paint_state: (skip)
+ *
+ */
+StThemeNodePaintState *
+st_theme_node_transition_get_new_paint_state (StThemeNodeTransition *transition)
+{
+ return &transition->priv->new_paint_state;
+}
+
+void
+st_theme_node_transition_update (StThemeNodeTransition *transition,
+ StThemeNode *new_node)
+{
+ StThemeNodeTransitionPrivate *priv;
+ StThemeNode *old_node;
+ ClutterTimelineDirection direction;
+
+ g_return_if_fail (ST_IS_THEME_NODE_TRANSITION (transition));
+ g_return_if_fail (ST_IS_THEME_NODE (new_node));
+
+ priv = transition->priv;
+ direction = clutter_timeline_get_direction (priv->timeline);
+ old_node = (direction == CLUTTER_TIMELINE_FORWARD) ? priv->old_theme_node
+ : priv->new_theme_node;
+
+ /* If the update is the reversal of the current transition,
+ * we reverse the timeline.
+ * Otherwise, we should initiate a new transition from the
+ * current state to the new one; this is hard to do if the
+ * transition is in an intermediate state, so we just cancel
+ * the ongoing transition in that case.
+ * Note that reversing a timeline before any time elapsed
+ * results in the timeline's time position being set to the
+ * full duration - this is not what we want, so we cancel the
+ * transition as well in that case.
+ */
+ if (st_theme_node_equal (new_node, old_node))
+ {
+ {
+ StThemeNodePaintState tmp;
+
+ st_theme_node_paint_state_init (&tmp);
+ st_theme_node_paint_state_copy (&tmp, &priv->old_paint_state);
+ st_theme_node_paint_state_copy (&priv->old_paint_state, &priv->new_paint_state);
+ st_theme_node_paint_state_copy (&priv->new_paint_state, &tmp);
+ st_theme_node_paint_state_free (&tmp);
+ }
+
+ if (clutter_timeline_get_elapsed_time (priv->timeline) > 0)
+ {
+ if (direction == CLUTTER_TIMELINE_FORWARD)
+ clutter_timeline_set_direction (priv->timeline,
+ CLUTTER_TIMELINE_BACKWARD);
+ else
+ clutter_timeline_set_direction (priv->timeline,
+ CLUTTER_TIMELINE_FORWARD);
+ }
+ else
+ {
+ clutter_timeline_stop (priv->timeline);
+ g_signal_emit (transition, signals[COMPLETED], 0);
+ }
+ }
+ else
+ {
+ if (clutter_timeline_get_elapsed_time (priv->timeline) > 0)
+ {
+ clutter_timeline_stop (priv->timeline);
+ g_signal_emit (transition, signals[COMPLETED], 0);
+ }
+ else
+ {
+ guint new_duration = st_theme_node_get_transition_duration (new_node);
+
+ clutter_timeline_set_duration (priv->timeline, new_duration);
+
+ g_object_unref (priv->new_theme_node);
+ priv->new_theme_node = g_object_ref (new_node);
+
+ st_theme_node_paint_state_invalidate (&priv->new_paint_state);
+ }
+ }
+}
+
+static void
+calculate_offscreen_box (StThemeNodeTransition *transition,
+ const ClutterActorBox *allocation)
+{
+ ClutterActorBox paint_box;
+
+ st_theme_node_transition_get_paint_box (transition,
+ allocation,
+ &paint_box);
+ transition->priv->offscreen_box.x1 = paint_box.x1 - allocation->x1;
+ transition->priv->offscreen_box.y1 = paint_box.y1 - allocation->y1;
+ transition->priv->offscreen_box.x2 = paint_box.x2 - allocation->x1;
+ transition->priv->offscreen_box.y2 = paint_box.y2 - allocation->y1;
+}
+
+void
+st_theme_node_transition_get_paint_box (StThemeNodeTransition *transition,
+ const ClutterActorBox *allocation,
+ ClutterActorBox *paint_box)
+{
+ StThemeNodeTransitionPrivate *priv = transition->priv;
+ ClutterActorBox old_node_box, new_node_box;
+
+ st_theme_node_get_paint_box (priv->old_theme_node,
+ allocation,
+ &old_node_box);
+
+ st_theme_node_get_paint_box (priv->new_theme_node,
+ allocation,
+ &new_node_box);
+
+ paint_box->x1 = MIN (old_node_box.x1, new_node_box.x1);
+ paint_box->y1 = MIN (old_node_box.y1, new_node_box.y1);
+ paint_box->x2 = MAX (old_node_box.x2, new_node_box.x2);
+ paint_box->y2 = MAX (old_node_box.y2, new_node_box.y2);
+}
+
+static gboolean
+setup_framebuffers (StThemeNodeTransition *transition,
+ const ClutterActorBox *allocation,
+ float resource_scale)
+{
+ StThemeNodeTransitionPrivate *priv = transition->priv;
+ CoglContext *ctx;
+ guint width, height;
+ GError *catch_error = NULL;
+
+ /* template material to avoid unnecessary shader compilation */
+ static CoglPipeline *material_template = NULL;
+
+ ctx = clutter_backend_get_cogl_context (clutter_get_default_backend ());
+ width = ceilf ((priv->offscreen_box.x2 - priv->offscreen_box.x1) * resource_scale);
+ height = ceilf ((priv->offscreen_box.y2 - priv->offscreen_box.y1) * resource_scale);
+
+ g_return_val_if_fail (width > 0, FALSE);
+ g_return_val_if_fail (height > 0, FALSE);
+
+ cogl_clear_object (&priv->old_texture);
+ priv->old_texture = COGL_TEXTURE (cogl_texture_2d_new_with_size (ctx, width, height));
+
+ cogl_clear_object (&priv->new_texture);
+ priv->new_texture = COGL_TEXTURE (cogl_texture_2d_new_with_size (ctx, width, height));
+
+ if (priv->old_texture == NULL)
+ return FALSE;
+
+ if (priv->new_texture == NULL)
+ return FALSE;
+
+ cogl_clear_object (&priv->old_offscreen);
+ priv->old_offscreen = COGL_FRAMEBUFFER (cogl_offscreen_new_with_texture (priv->old_texture));
+ if (!cogl_framebuffer_allocate (priv->old_offscreen, &catch_error))
+ {
+ g_error_free (catch_error);
+ cogl_clear_object (&priv->old_offscreen);
+ return FALSE;
+ }
+
+ cogl_clear_object (&priv->new_offscreen);
+ priv->new_offscreen = COGL_FRAMEBUFFER (cogl_offscreen_new_with_texture (priv->new_texture));
+ if (!cogl_framebuffer_allocate (priv->new_offscreen, &catch_error))
+ {
+ g_error_free (catch_error);
+ cogl_clear_object (&priv->new_offscreen);
+ return FALSE;
+ }
+
+ if (priv->material == NULL)
+ {
+ if (G_UNLIKELY (material_template == NULL))
+ {
+ CoglContext *ctx =
+ clutter_backend_get_cogl_context (clutter_get_default_backend ());
+ material_template = cogl_pipeline_new (ctx);
+
+ cogl_pipeline_set_layer_combine (material_template, 0,
+ "RGBA = REPLACE (TEXTURE)",
+ NULL);
+ cogl_pipeline_set_layer_combine (material_template, 1,
+ "RGBA = INTERPOLATE (PREVIOUS, "
+ "TEXTURE, "
+ "CONSTANT[A])",
+ NULL);
+ cogl_pipeline_set_layer_combine (material_template, 2,
+ "RGBA = MODULATE (PREVIOUS, "
+ "PRIMARY)",
+ NULL);
+ }
+ priv->material = cogl_pipeline_copy (material_template);
+ }
+
+ cogl_pipeline_set_layer_texture (priv->material, 0, priv->new_texture);
+ cogl_pipeline_set_layer_texture (priv->material, 1, priv->old_texture);
+
+ cogl_framebuffer_clear4f (priv->old_offscreen, COGL_BUFFER_BIT_COLOR,
+ 0, 0, 0, 0);
+ cogl_framebuffer_orthographic (priv->old_offscreen,
+ priv->offscreen_box.x1,
+ priv->offscreen_box.y1,
+ priv->offscreen_box.x2,
+ priv->offscreen_box.y2, 0.0, 1.0);
+
+ st_theme_node_paint (priv->old_theme_node, &priv->old_paint_state,
+ priv->old_offscreen, allocation, 255, resource_scale);
+
+ cogl_framebuffer_clear4f (priv->new_offscreen, COGL_BUFFER_BIT_COLOR,
+ 0, 0, 0, 0);
+ cogl_framebuffer_orthographic (priv->new_offscreen,
+ priv->offscreen_box.x1,
+ priv->offscreen_box.y1,
+ priv->offscreen_box.x2,
+ priv->offscreen_box.y2, 0.0, 1.0);
+ st_theme_node_paint (priv->new_theme_node, &priv->new_paint_state,
+ priv->new_offscreen, allocation, 255, resource_scale);
+
+ return TRUE;
+}
+
+void
+st_theme_node_transition_paint (StThemeNodeTransition *transition,
+ CoglFramebuffer *framebuffer,
+ ClutterActorBox *allocation,
+ guint8 paint_opacity,
+ float resource_scale)
+{
+ StThemeNodeTransitionPrivate *priv = transition->priv;
+
+ CoglColor constant;
+ float tex_coords[] = {
+ 0.0, 0.0, 1.0, 1.0,
+ 0.0, 0.0, 1.0, 1.0,
+ };
+
+ g_return_if_fail (ST_IS_THEME_NODE (priv->old_theme_node));
+ g_return_if_fail (ST_IS_THEME_NODE (priv->new_theme_node));
+
+ if (!clutter_actor_box_equal (allocation, &priv->last_allocation))
+ priv->needs_setup = TRUE;
+
+ if (priv->needs_setup)
+ {
+ priv->last_allocation = *allocation;
+
+ calculate_offscreen_box (transition, allocation);
+ priv->needs_setup = !setup_framebuffers (transition, allocation,
+ resource_scale);
+
+ if (priv->needs_setup) /* setting up framebuffers failed */
+ return;
+ }
+
+ cogl_color_init_from_4f (&constant, 0., 0., 0.,
+ clutter_timeline_get_progress (priv->timeline));
+ cogl_pipeline_set_layer_combine_constant (priv->material, 1, &constant);
+
+ cogl_pipeline_set_color4ub (priv->material,
+ paint_opacity, paint_opacity,
+ paint_opacity, paint_opacity);
+
+ cogl_framebuffer_draw_multitextured_rectangle (framebuffer,
+ priv->material,
+ priv->offscreen_box.x1,
+ priv->offscreen_box.y1,
+ priv->offscreen_box.x2,
+ priv->offscreen_box.y2,
+ tex_coords, 8);
+}
+
+static void
+st_theme_node_transition_dispose (GObject *object)
+{
+ StThemeNodeTransitionPrivate *priv = ST_THEME_NODE_TRANSITION (object)->priv;
+
+ g_clear_object (&priv->old_theme_node);
+ g_clear_object (&priv->new_theme_node);
+
+ cogl_clear_object (&priv->old_texture);
+ cogl_clear_object (&priv->new_texture);
+
+ cogl_clear_object (&priv->old_offscreen);
+ cogl_clear_object (&priv->new_offscreen);
+
+ cogl_clear_object (&priv->material);
+
+ if (priv->timeline)
+ {
+ g_clear_signal_handler (&priv->timeline_completed_id, priv->timeline);
+ g_clear_signal_handler (&priv->timeline_new_frame_id, priv->timeline);
+
+ g_clear_object (&priv->timeline);
+ }
+
+ priv->timeline_completed_id = 0;
+ priv->timeline_new_frame_id = 0;
+
+ st_theme_node_paint_state_free (&priv->old_paint_state);
+ st_theme_node_paint_state_free (&priv->new_paint_state);
+
+ G_OBJECT_CLASS (st_theme_node_transition_parent_class)->dispose (object);
+}
+
+static void
+st_theme_node_transition_init (StThemeNodeTransition *transition)
+{
+ transition->priv = st_theme_node_transition_get_instance_private (transition);
+
+ 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;
+
+ st_theme_node_paint_state_init (&transition->priv->old_paint_state);
+ st_theme_node_paint_state_init (&transition->priv->new_paint_state);
+
+ transition->priv->needs_setup = TRUE;
+}
+
+static void
+st_theme_node_transition_class_init (StThemeNodeTransitionClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+ object_class->dispose = st_theme_node_transition_dispose;
+
+ signals[COMPLETED] =
+ g_signal_new ("completed",
+ G_TYPE_FROM_CLASS (klass),
+ G_SIGNAL_RUN_LAST,
+ 0, NULL, NULL, NULL,
+ G_TYPE_NONE, 0);
+
+ signals[NEW_FRAME] =
+ g_signal_new ("new-frame",
+ G_TYPE_FROM_CLASS (klass),
+ G_SIGNAL_RUN_LAST,
+ 0, NULL, NULL, NULL,
+ G_TYPE_NONE, 0);
+}