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Diffstat (limited to 'src/st/st-theme-node-transition.c')
| -rw-r--r-- | src/st/st-theme-node-transition.c | 469 |
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 new file mode 100644 index 0000000..b736665 --- /dev/null +++ b/src/st/st-theme-node-transition.c @@ -0,0 +1,469 @@ +/* -*- 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); +} |