/* * Clutter. * * An OpenGL based 'interactive canvas' library. * * Authored By Matthew Allum * * Copyright (C) 2006 OpenedHand * * This library 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 of the License, or (at your option) any later version. * * This library is distributed in the hope that 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 library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /** * SECTION:clutter-stage * @short_description: Top level visual element to which actors are placed. * * #ClutterStage is a top level 'window' on which child actors are placed * and manipulated. */ #include "config.h" #include "clutter-backend.h" #include "clutter-stage.h" #include "clutter-main.h" #include "clutter-color.h" #include "clutter-util.h" #include "clutter-marshal.h" #include "clutter-enum-types.h" #include "clutter-private.h" #include "clutter-debug.h" #include "clutter-version.h" /* For flavour */ #include #include #define FIXED_PERSPECTIVE #undef USING_GLES G_DEFINE_ABSTRACT_TYPE (ClutterStage, clutter_stage, CLUTTER_TYPE_GROUP); #define CLUTTER_STAGE_GET_PRIVATE(obj) \ (G_TYPE_INSTANCE_GET_PRIVATE ((obj), CLUTTER_TYPE_STAGE, ClutterStagePrivate)) struct _ClutterStagePrivate { ClutterColor color; guint is_fullscreen : 1; guint is_offscreen : 1; guint is_cursor_visible : 1; }; enum { PROP_0, PROP_COLOR, PROP_FULLSCREEN, PROP_OFFSCREEN, PROP_CURSOR_VISIBLE }; enum { EVENT, BUTTON_PRESS_EVENT, BUTTON_RELEASE_EVENT, SCROLL_EVENT, KEY_PRESS_EVENT, KEY_RELEASE_EVENT, MOTION_EVENT, STAGE_STATE_EVENT, DELETE_EVENT, LAST_SIGNAL }; static guint stage_signals[LAST_SIGNAL] = { 0 }; static gboolean clutter_stage_delete_event (ClutterStage *stage, ClutterAnyEvent *event) { /* FIXME - destroy the main stage, probably attaching a weak ref * to it from the backend, so that it gets destroyed too. */ CLUTTER_NOTE (EVENT, "Received a destroy notification"); /* we don't want to block */ return FALSE; } static void clutter_stage_paint (ClutterActor *actor) { /* chain up */ CLUTTER_NOTE (PAINT, "Chaining up to parent class paint"); if (CLUTTER_ACTOR_CLASS (clutter_stage_parent_class)->paint) CLUTTER_ACTOR_CLASS (clutter_stage_parent_class)->paint (actor); } static void clutter_stage_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) { ClutterStage *stage; ClutterStagePrivate *priv; ClutterActor *actor; stage = CLUTTER_STAGE (object); actor = CLUTTER_ACTOR (stage); priv = stage->priv; switch (prop_id) { case PROP_COLOR: clutter_stage_set_color (stage, g_value_get_boxed (value)); break; case PROP_OFFSCREEN: if (CLUTTER_ACTOR_IS_REALIZED (actor)) { clutter_actor_unrealize (actor); priv->is_offscreen = g_value_get_boolean (value); clutter_actor_realize (actor); } else priv->is_offscreen = g_value_get_boolean (value); break; case PROP_FULLSCREEN: if (g_value_get_boolean (value)) clutter_stage_fullscreen (stage); else clutter_stage_unfullscreen (stage); break; case PROP_CURSOR_VISIBLE: if (g_value_get_boolean (value)) clutter_stage_show_cursor (stage); else clutter_stage_hide_cursor (stage); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void clutter_stage_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) { ClutterStage *stage; ClutterStagePrivate *priv; ClutterColor color; stage = CLUTTER_STAGE(object); priv = stage->priv; switch (prop_id) { case PROP_COLOR: clutter_stage_get_color (stage, &color); g_value_set_boxed (value, &color); break; case PROP_OFFSCREEN: g_value_set_boolean (value, priv->is_offscreen); break; case PROP_FULLSCREEN: g_value_set_boolean (value, priv->is_fullscreen); break; case PROP_CURSOR_VISIBLE: g_value_set_boolean (value, priv->is_cursor_visible); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void clutter_stage_class_init (ClutterStageClass *klass) { GObjectClass *gobject_class = G_OBJECT_CLASS (klass); ClutterActorClass *actor_class = CLUTTER_ACTOR_CLASS (klass); ClutterStageClass *stage_class = CLUTTER_STAGE_CLASS (klass); gobject_class->set_property = clutter_stage_set_property; gobject_class->get_property = clutter_stage_get_property; actor_class->paint = clutter_stage_paint; stage_class->delete_event = clutter_stage_delete_event; /** * ClutterStage:fullscreen * * Whether the stage should be fullscreen or not. */ g_object_class_install_property (gobject_class, PROP_FULLSCREEN, g_param_spec_boolean ("fullscreen", "Fullscreen", "Whether the main stage is fullscreen", FALSE, G_PARAM_CONSTRUCT | CLUTTER_PARAM_READWRITE)); g_object_class_install_property (gobject_class, PROP_OFFSCREEN, g_param_spec_boolean ("offscreen", "Offscreen", "Whether the main stage is renderer offscreen", FALSE, G_PARAM_CONSTRUCT | CLUTTER_PARAM_READWRITE)); g_object_class_install_property (gobject_class, PROP_CURSOR_VISIBLE, g_param_spec_boolean ("cursor-visible", "Cursor Visible", "Whether the mouse pointer is visible on the main stage ", FALSE, G_PARAM_CONSTRUCT | CLUTTER_PARAM_READWRITE)); g_object_class_install_property (gobject_class, PROP_COLOR, g_param_spec_boxed ("color", "Color", "The color of the main stage", CLUTTER_TYPE_COLOR, CLUTTER_PARAM_READWRITE)); /** * ClutterStage::event: * @stage: the actor which received the event * @event: a #ClutterEvent * * The ::event signal is emitted each time and event is received * by the @stage. */ stage_signals[EVENT] = g_signal_new ("event", G_TYPE_FROM_CLASS (gobject_class), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (ClutterStageClass, event), NULL, NULL, clutter_marshal_VOID__BOXED, G_TYPE_NONE, 1, CLUTTER_TYPE_EVENT | G_SIGNAL_TYPE_STATIC_SCOPE); /** * ClutterStage::button-press-event: * @stage: the actor which received the event * @event: a #ClutterButtonEvent * * The ::button-press-event signal is emitted each time a mouse button * is pressed on @stage. */ stage_signals[BUTTON_PRESS_EVENT] = g_signal_new ("button-press-event", G_TYPE_FROM_CLASS (gobject_class), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (ClutterStageClass, button_press_event), NULL, NULL, clutter_marshal_VOID__BOXED, G_TYPE_NONE, 1, CLUTTER_TYPE_EVENT | G_SIGNAL_TYPE_STATIC_SCOPE); /** * ClutterStage::button-release-event: * @stage: the actor which received the event * @event: a #ClutterButtonEvent * * The ::button-release-event signal is emitted each time a mouse button * is released on @stage. */ stage_signals[BUTTON_RELEASE_EVENT] = g_signal_new ("button-release-event", G_TYPE_FROM_CLASS (gobject_class), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (ClutterStageClass, button_release_event), NULL, NULL, clutter_marshal_VOID__BOXED, G_TYPE_NONE, 1, CLUTTER_TYPE_EVENT | G_SIGNAL_TYPE_STATIC_SCOPE); /** * ClutterStage::scroll-event: * @stage: the actor which received the event * @event: a #ClutterScrollEvent * * The ::scroll-event signal is emitted each time a the mouse is * scrolled on @stage * * Since: 0.4 */ stage_signals[SCROLL_EVENT] = g_signal_new ("scroll-event", G_TYPE_FROM_CLASS (gobject_class), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (ClutterStageClass, scroll_event), NULL, NULL, clutter_marshal_VOID__BOXED, G_TYPE_NONE, 1, CLUTTER_TYPE_EVENT | G_SIGNAL_TYPE_STATIC_SCOPE); /** * ClutterStage::key-press-event: * @stage: the actor which received the event * @event: a #ClutterKeyEvent * * The ::key-press-event signal is emitted each time a keyboard button * is pressed on @stage. */ stage_signals[KEY_PRESS_EVENT] = g_signal_new ("key-press-event", G_TYPE_FROM_CLASS (gobject_class), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (ClutterStageClass, key_press_event), NULL, NULL, clutter_marshal_VOID__BOXED, G_TYPE_NONE, 1, CLUTTER_TYPE_EVENT | G_SIGNAL_TYPE_STATIC_SCOPE); /** * ClutterStage::key-release-event: * @stage: the actor which received the event * @event: a #ClutterKeyEvent * * The ::key-release-event signal is emitted each time a keyboard button * is released on @stage. */ stage_signals[KEY_RELEASE_EVENT] = g_signal_new ("key-release-event", G_TYPE_FROM_CLASS (gobject_class), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (ClutterStageClass, key_release_event), NULL, NULL, clutter_marshal_VOID__BOXED, G_TYPE_NONE, 1, CLUTTER_TYPE_EVENT | G_SIGNAL_TYPE_STATIC_SCOPE); /** * ClutterStage::motion-event: * @stage: the actor which received the event * @event: a #ClutterMotionEvent * * The ::motion-event signal is emitted each time the mouse pointer is * moved on @stage. */ stage_signals[MOTION_EVENT] = g_signal_new ("motion-event", G_TYPE_FROM_CLASS (gobject_class), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (ClutterStageClass, motion_event), NULL, NULL, clutter_marshal_VOID__BOXED, G_TYPE_NONE, 1, CLUTTER_TYPE_EVENT | G_SIGNAL_TYPE_STATIC_SCOPE); stage_signals[DELETE_EVENT] = g_signal_new ("delete-event", G_TYPE_FROM_CLASS (gobject_class), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (ClutterStageClass, delete_event), _clutter_boolean_accumulator, NULL, clutter_marshal_VOID__BOXED, G_TYPE_BOOLEAN, 1, CLUTTER_TYPE_EVENT | G_SIGNAL_TYPE_STATIC_SCOPE); g_type_class_add_private (gobject_class, sizeof (ClutterStagePrivate)); } static void clutter_stage_init (ClutterStage *self) { ClutterStagePrivate *priv; /* a stage is a top-level object */ CLUTTER_SET_PRIVATE_FLAGS (self, CLUTTER_ACTOR_IS_TOPLEVEL); self->priv = priv = CLUTTER_STAGE_GET_PRIVATE (self); priv->is_offscreen = FALSE; priv->is_fullscreen = FALSE; priv->is_cursor_visible = FALSE; priv->color.red = 0xff; priv->color.green = 0xff; priv->color.blue = 0xff; priv->color.alpha = 0xff; clutter_actor_set_size (CLUTTER_ACTOR (self), 640, 480); } /** * clutter_stage_get_default: * * Returns the main stage. #ClutterStage is a singleton, so * the stage will be created the first time this function is * called (typically, inside clutter_init()); all the subsequent * calls to clutter_stage_get_default() will return the same * instance. * * Return value: the main #ClutterStage. You should never * destroy or unref the returned actor. */ ClutterActor * clutter_stage_get_default (void) { ClutterMainContext *context; context = clutter_context_get_default (); g_assert (context != NULL); return _clutter_backend_get_stage (context->backend); } /** * clutter_stage_set_color * @stage: A #ClutterStage * @color: A #ClutterColor * * Set the stage color. **/ void clutter_stage_set_color (ClutterStage *stage, const ClutterColor *color) { ClutterStagePrivate *priv; g_return_if_fail (CLUTTER_IS_STAGE (stage)); g_return_if_fail (color != NULL); priv = stage->priv; priv->color.red = color->red; priv->color.green = color->green; priv->color.blue = color->blue; priv->color.alpha = color->alpha; if (CLUTTER_ACTOR_IS_VISIBLE (CLUTTER_ACTOR (stage))) clutter_actor_queue_redraw (CLUTTER_ACTOR (stage)); g_object_notify (G_OBJECT (stage), "color"); } /** * clutter_stage_get_color * @stage: A #ClutterStage * @color: return location for a #ClutterColor * * Retrieves the stage color. */ void clutter_stage_get_color (ClutterStage *stage, ClutterColor *color) { ClutterStagePrivate *priv; g_return_if_fail (CLUTTER_IS_STAGE (stage)); g_return_if_fail (color != NULL); priv = stage->priv; color->red = priv->color.red; color->green = priv->color.green; color->blue = priv->color.blue; color->alpha = priv->color.alpha; } /** * clutter_stage_fullscreen: * @stage: a #ClutterStage * * Asks to place the stage window in the fullscreen state. Note that you * shouldn't assume the window is definitely full screen afterward, because * other entities (e.g. the user or window manager) could unfullscreen it * again, and not all window managers honor requests to fullscreen windows. */ void clutter_stage_fullscreen (ClutterStage *stage) { ClutterStagePrivate *priv; g_return_if_fail (CLUTTER_IS_STAGE (stage)); priv = stage->priv; if (!priv->is_fullscreen) { priv->is_fullscreen = TRUE; if (CLUTTER_STAGE_GET_CLASS (stage)->set_fullscreen) CLUTTER_STAGE_GET_CLASS (stage)->set_fullscreen (stage, TRUE); g_object_notify (G_OBJECT (stage), "fullscreen"); } } /** * clutter_stage_unfullscreen: * @stage: a #ClutterStage * * Asks to toggle off the fullscreen state for the stage window. Note that * you shouldn't assume the window is definitely not full screen afterward, * because other entities (e.g. the user or window manager) could fullscreen * it again, and not all window managers honor requests to unfullscreen * windows. */ void clutter_stage_unfullscreen (ClutterStage *stage) { ClutterStagePrivate *priv; g_return_if_fail (CLUTTER_IS_STAGE (stage)); priv = stage->priv; if (priv->is_fullscreen) { priv->is_fullscreen = FALSE; if (CLUTTER_STAGE_GET_CLASS (stage)->set_fullscreen) CLUTTER_STAGE_GET_CLASS (stage)->set_fullscreen (stage, FALSE); g_object_notify (G_OBJECT (stage), "fullscreen"); } } /** * clutter_stage_show_cursor: * @stage: a #ClutterStage * * Shows the cursor on the stage window */ void clutter_stage_show_cursor (ClutterStage *stage) { ClutterStagePrivate *priv; g_return_if_fail (CLUTTER_IS_STAGE (stage)); priv = stage->priv; if (!priv->is_cursor_visible) { priv->is_cursor_visible = TRUE; if (CLUTTER_STAGE_GET_CLASS (stage)->set_cursor_visible) CLUTTER_STAGE_GET_CLASS (stage)->set_cursor_visible (stage, TRUE); g_object_notify (G_OBJECT (stage), "cursor-visible"); } } /** * clutter_stage_hide_cursor: * @stage: * * Hides the cursor as invisible on the stage window */ void clutter_stage_hide_cursor (ClutterStage *stage) { ClutterStagePrivate *priv; g_return_if_fail (CLUTTER_IS_STAGE (stage)); priv = stage->priv; if (priv->is_cursor_visible) { priv->is_cursor_visible = FALSE; if (CLUTTER_STAGE_GET_CLASS (stage)->set_cursor_visible) CLUTTER_STAGE_GET_CLASS (stage)->set_cursor_visible (stage, FALSE); g_object_notify (G_OBJECT (stage), "cursor-visible"); } } /** * clutter_stage_snapshot * @stage: A #ClutterStage * @x: x coordinate of the first pixel that is read from stage * @y: y coordinate of the first pixel that is read from stage * @width: Width dimention of pixels to be read, or -1 for the * entire stage width * @height: Height dimention of pixels to be read, or -1 for the * entire stage height * * Gets a pixel based representation of the current rendered stage. * * Return value: pixel representation as a #GdkPixbuf **/ GdkPixbuf * clutter_stage_snapshot (ClutterStage *stage, gint x, gint y, gint width, gint height) { ClutterStageClass *klass; g_return_val_if_fail (CLUTTER_IS_STAGE (stage), NULL); g_return_val_if_fail (x >= 0 && y >= 0, NULL); klass = CLUTTER_STAGE_GET_CLASS (stage); if (klass->draw_to_pixbuf) { GdkPixbuf *retval = NULL; klass->draw_to_pixbuf (stage, retval, x, y, width, height); return retval; } return NULL; } #ifndef FIXED_PERSPECTIVE /* * Original floating point implementaiton of the perspective function, * retained for reference purposes */ static inline void frustum (GLfloat left, GLfloat right, GLfloat bottom, GLfloat top, GLfloat nearval, GLfloat farval) { GLfloat x, y, a, b, c, d; GLfloat m[16]; x = (2.0 * nearval) / (right - left); y = (2.0 * nearval) / (top - bottom); a = (right + left) / (right - left); b = (top + bottom) / (top - bottom); c = -(farval + nearval) / ( farval - nearval); d = -(2.0 * farval * nearval) / (farval - nearval); #define M(row,col) m[col*4+row] M(0,0) = x; M(0,1) = 0.0F; M(0,2) = a; M(0,3) = 0.0F; M(1,0) = 0.0F; M(1,1) = y; M(1,2) = b; M(1,3) = 0.0F; M(2,0) = 0.0F; M(2,1) = 0.0F; M(2,2) = c; M(2,3) = d; M(3,0) = 0.0F; M(3,1) = 0.0F; M(3,2) = -1.0F; M(3,3) = 0.0F; #undef M glMultMatrixf (m); } static inline void perspective (GLfloat fovy, GLfloat aspect, GLfloat zNear, GLfloat zFar) { GLfloat xmin, xmax, ymin, ymax; ymax = zNear * tan (fovy * M_PI / 360.0); ymin = -ymax; xmin = ymin * aspect; xmax = ymax * aspect; printf ("%f, %f, %f, %f\n", xmin, xmax, ymin, ymax); frustum (xmin, xmax, ymin, ymax, zNear, zFar); } #else /* * Fixed point implementation of the perspective function */ static inline void perspectivex (ClutterAngle fovy, ClutterFixed aspect, ClutterFixed zNear, ClutterFixed zFar) { ClutterFixed xmax, ymax; ClutterFixed x, y, c, d; #ifndef USING_GLES GLfloat m[16]; #else GLfixed m[16]; #endif memset (&m[0], 0, sizeof (m)); /* * Based on the original algorithm in perspective(): * * 1) xmin = -xmax => xmax + xmin == 0 && xmax - xmin == 2 * xmax * same true for y, hence: a == 0 && b == 0; * * 2) When working with small numbers, we can are loosing significant * precision, hence we use clutter_qmulx() here, not the fast macro. */ ymax = clutter_qmulx (zNear, clutter_tani (fovy >> 1)); xmax = clutter_qmulx (ymax, aspect); x = CFX_DIV (zNear, xmax); y = CFX_DIV (zNear, ymax); c = CFX_DIV (-(zFar + zNear), ( zFar - zNear)); d = CFX_DIV (-(clutter_qmulx (2*zFar, zNear)), (zFar - zNear)); #define M(row,col) m[col*4+row] #ifndef USING_GLES M(0,0) = CLUTTER_FIXED_TO_FLOAT (x); M(1,1) = CLUTTER_FIXED_TO_FLOAT (y); M(2,2) = CLUTTER_FIXED_TO_FLOAT (c); M(2,3) = CLUTTER_FIXED_TO_FLOAT (d); M(3,2) = -1.0F; glMultMatrixf (m); #else M(0,0) = x; M(1,1) = y; M(2,2) = c; M(2,3) = d; M(3,2) = 1 + ~CFX_ONE; glMultMatrixx (m); #endif #undef M } #endif void _clutter_stage_sync_viewport (ClutterStage *stage) { ClutterActor *actor; gint width, height; g_return_if_fail (CLUTTER_IS_STAGE (stage)); actor = CLUTTER_ACTOR (stage); width = clutter_actor_get_width (actor); height = clutter_actor_get_height (actor); glViewport (0, 0, width, height); glMatrixMode (GL_PROJECTION); glLoadIdentity (); #ifndef FIXED_PERSPECTIVE perspective (60.0f, 1.0f, 0.1f, 100.0f); #else perspectivex (171, /* 60 degrees */ CFX_ONE, CLUTTER_FLOAT_TO_FIXED (0.1), CLUTTER_FLOAT_TO_FIXED (100.0)); #endif glMatrixMode (GL_MODELVIEW); glLoadIdentity (); /* Then for 2D like transform */ /* camera distance from screen, 0.5 * tan (FOV) */ #define DEFAULT_Z_CAMERA 0.866025404f glTranslatef (-0.5f, -0.5f, -DEFAULT_Z_CAMERA); glScalef ( 1.0f / width, -1.0f / height, 1.0f / width); glTranslatef (0.0f, -1.0 * height, 0.0f); } /** * clutter_stage_get_actor_at_pos: * @stage: * @x: * @y: * * FIXME * * Return value: the actor at the specified coordinates, if any */ ClutterActor * clutter_stage_get_actor_at_pos (ClutterStage *stage, gint x, gint y) { ClutterActor *found = NULL; GLuint buff[64] = { 0 }; GLint hits; GLint view[4]; g_return_val_if_fail (CLUTTER_IS_STAGE (stage), NULL); glSelectBuffer (sizeof (buff), buff); glGetIntegerv (GL_VIEWPORT, view); glRenderMode (GL_SELECT); glInitNames (); glPushName (0); glMatrixMode (GL_PROJECTION); glPushMatrix (); glLoadIdentity (); /* This is gluPickMatrix(x, y, 1.0, 1.0, view); */ glTranslatef ((view[2] - 2 * (x - view[0])), (view[3] - 2 * (y - view[1])), 0); glScalef (view[2], -view[3], 1.0); #ifndef FIXED_PERSPECTIVE perspective (60.0f, 1.0f, 0.1f, 100.0f); #else perspectivex (171, /* 60 degrees */ CFX_ONE, CLUTTER_FLOAT_TO_FIXED (0.1), CLUTTER_FLOAT_TO_FIXED (100.0)); #endif glMatrixMode (GL_MODELVIEW); clutter_actor_paint (CLUTTER_ACTOR (stage)); glMatrixMode (GL_PROJECTION); glPopMatrix (); hits = glRenderMode (GL_RENDER); if (hits != 0) { #if 0 gint i for (i = 0; i < hits; i++) g_print ("Hit at %i\n", buff[i * 4 + 3]); #endif found = clutter_group_find_child_by_id (CLUTTER_GROUP (stage), buff[(hits-1) * 4 + 3]); } _clutter_stage_sync_viewport (stage); return found; } /*** Perspective boxed type ******/ /** * clutter_perspective_copy: * @perspective: a #ClutterPerspective * * Makes a copy of the perspective structure. The result must be * freed using clutter_perspective_free(). * * Return value: an allocated copy of @perspective. * * Since: 0.2 */ ClutterPerspective * clutter_perspective_copy (const ClutterPerspective *perspective) { ClutterPerspective *result; g_return_val_if_fail (perspective != NULL, NULL); result = g_slice_new (ClutterPerspective); *result = *perspective; return result; } /** * clutter_perspective_free: * @perspective: a #ClutterPerspective * * Frees a perspective structure created with clutter_perspective_copy(). * * Since: 0.4 */ void clutter_perspective_free (ClutterPerspective *perspective) { g_return_if_fail (perspective != NULL); g_slice_free (ClutterPerspective, perspective); } GType clutter_perspective_get_type (void) { static GType our_type = 0; if (!our_type) our_type = g_boxed_type_register_static ("ClutterPerspective", (GBoxedCopyFunc) clutter_perspective_copy, (GBoxedFreeFunc) clutter_perspective_free); return our_type; }