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mutter/clutter/clutter/clutter-stage.c
Jonas Ådahl 238e41d493 cogl: Install cogl-trace.h and include from cogl.h 
This is so that cogl-trace.h can start using things from cogl-macros.h,
and so that it doesn't leak cogl-config.h into the world, while exposing
it to e.g. gnome-shell so that it can make use of it as well. There is
no practical reason why we shouldn't just include cogl-trace.h via
cogl.h as we do with everything else.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/1059
2020-03-26 09:05:38 +01:00

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Authored By Matthew Allum <mallum@openedhand.com>
*
* 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, see <http://www.gnu.org/licenses/>.
*/
/**
* 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.
*
* Backends might provide support for multiple stages. The support for this
* feature can be checked at run-time using the clutter_feature_available()
* function and the %CLUTTER_FEATURE_STAGE_MULTIPLE flag. If the backend used
* supports multiple stages, new #ClutterStage instances can be created
* using clutter_stage_new(). These stages must be managed by the developer
* using clutter_actor_destroy(), which will take care of destroying all the
* actors contained inside them.
*
* #ClutterStage is a proxy actor, wrapping the backend-specific implementation
* (a #StageWindow) of the windowing system. It is possible to subclass
* #ClutterStage, as long as every overridden virtual function chains up to the
* parent class corresponding function.
*/
#include "clutter-build-config.h"
#include <math.h>
#include <cairo.h>
#define CLUTTER_DISABLE_DEPRECATION_WARNINGS
#define CLUTTER_ENABLE_EXPERIMENTAL_API
#include "clutter-stage.h"
#include "deprecated/clutter-stage.h"
#include "deprecated/clutter-container.h"
#include "clutter-actor-private.h"
#include "clutter-backend-private.h"
#include "clutter-cairo.h"
#include "clutter-color.h"
#include "clutter-container.h"
#include "clutter-debug.h"
#include "clutter-enum-types.h"
#include "clutter-event-private.h"
#include "clutter-id-pool.h"
#include "clutter-input-device-private.h"
#include "clutter-main.h"
#include "clutter-marshal.h"
#include "clutter-master-clock.h"
#include "clutter-mutter.h"
#include "clutter-paint-context-private.h"
#include "clutter-paint-volume-private.h"
#include "clutter-pick-context-private.h"
#include "clutter-private.h"
#include "clutter-stage-manager-private.h"
#include "clutter-stage-private.h"
#include "clutter-stage-view-private.h"
#include "clutter-private.h"
#include "cogl/cogl.h"
struct _ClutterStageQueueRedrawEntry
{
ClutterActor *actor;
gboolean has_clip;
ClutterPaintVolume clip;
};
typedef struct _PickRecord
{
graphene_point_t vertex[4];
ClutterActor *actor;
int clip_stack_top;
} PickRecord;
typedef struct _PickClipRecord
{
int prev;
graphene_point_t vertex[4];
} PickClipRecord;
struct _ClutterStagePrivate
{
/* the stage implementation */
ClutterStageWindow *impl;
ClutterPerspective perspective;
CoglMatrix projection;
CoglMatrix inverse_projection;
CoglMatrix view;
float viewport[4];
gchar *title;
ClutterActor *key_focused_actor;
GQueue *event_queue;
GArray *paint_volume_stack;
ClutterPlane current_clip_planes[4];
GHashTable *pending_relayouts;
unsigned int pending_relayouts_version;
GList *pending_queue_redraws;
gint sync_delay;
GTimer *fps_timer;
gint32 timer_n_frames;
GArray *pick_stack;
GArray *pick_clip_stack;
int pick_clip_stack_top;
gboolean pick_stack_frozen;
ClutterPickMode cached_pick_mode;
#ifdef CLUTTER_ENABLE_DEBUG
gulong redraw_count;
#endif /* CLUTTER_ENABLE_DEBUG */
ClutterStageState current_state;
gpointer paint_data;
GDestroyNotify paint_notify;
int update_freeze_count;
guint redraw_pending : 1;
guint is_cursor_visible : 1;
guint throttle_motion_events : 1;
guint use_alpha : 1;
guint min_size_changed : 1;
guint accept_focus : 1;
guint motion_events_enabled : 1;
guint has_custom_perspective : 1;
guint stage_was_relayout : 1;
};
enum
{
PROP_0,
PROP_COLOR,
PROP_CURSOR_VISIBLE,
PROP_PERSPECTIVE,
PROP_TITLE,
PROP_USE_ALPHA,
PROP_KEY_FOCUS,
PROP_ACCEPT_FOCUS,
PROP_LAST
};
static GParamSpec *obj_props[PROP_LAST] = { NULL, };
enum
{
ACTIVATE,
DEACTIVATE,
DELETE_EVENT,
AFTER_PAINT,
PAINT_VIEW,
PRESENTED,
LAST_SIGNAL
};
static guint stage_signals[LAST_SIGNAL] = { 0, };
static const ClutterColor default_stage_color = { 255, 255, 255, 255 };
static void clutter_stage_maybe_finish_queue_redraws (ClutterStage *stage);
static void free_queue_redraw_entry (ClutterStageQueueRedrawEntry *entry);
static void capture_view_into (ClutterStage *stage,
gboolean paint,
ClutterStageView *view,
cairo_rectangle_int_t *rect,
uint8_t *data,
int stride);
static void clutter_stage_update_view_perspective (ClutterStage *stage);
static void clutter_container_iface_init (ClutterContainerIface *iface);
G_DEFINE_TYPE_WITH_CODE (ClutterStage, clutter_stage, CLUTTER_TYPE_GROUP,
G_ADD_PRIVATE (ClutterStage)
G_IMPLEMENT_INTERFACE (CLUTTER_TYPE_CONTAINER,
clutter_container_iface_init))
static void
clutter_stage_real_add (ClutterContainer *container,
ClutterActor *child)
{
clutter_actor_add_child (CLUTTER_ACTOR (container), child);
}
static void
clutter_stage_real_remove (ClutterContainer *container,
ClutterActor *child)
{
clutter_actor_remove_child (CLUTTER_ACTOR (container), child);
}
static void
clutter_stage_real_raise (ClutterContainer *container,
ClutterActor *child,
ClutterActor *sibling)
{
clutter_actor_set_child_above_sibling (CLUTTER_ACTOR (container),
child,
sibling);
}
static void
clutter_stage_real_lower (ClutterContainer *container,
ClutterActor *child,
ClutterActor *sibling)
{
clutter_actor_set_child_below_sibling (CLUTTER_ACTOR (container),
child,
sibling);
}
static void
clutter_stage_real_sort_depth_order (ClutterContainer *container)
{
}
static void
clutter_container_iface_init (ClutterContainerIface *iface)
{
iface->add = clutter_stage_real_add;
iface->remove = clutter_stage_real_remove;
iface->raise = clutter_stage_real_raise;
iface->lower = clutter_stage_real_lower;
iface->sort_depth_order = clutter_stage_real_sort_depth_order;
}
static void
clutter_stage_get_preferred_width (ClutterActor *self,
gfloat for_height,
gfloat *min_width_p,
gfloat *natural_width_p)
{
ClutterStagePrivate *priv = CLUTTER_STAGE (self)->priv;
cairo_rectangle_int_t geom;
if (priv->impl == NULL)
return;
_clutter_stage_window_get_geometry (priv->impl, &geom);
if (min_width_p)
*min_width_p = geom.width;
if (natural_width_p)
*natural_width_p = geom.width;
}
static void
clutter_stage_get_preferred_height (ClutterActor *self,
gfloat for_width,
gfloat *min_height_p,
gfloat *natural_height_p)
{
ClutterStagePrivate *priv = CLUTTER_STAGE (self)->priv;
cairo_rectangle_int_t geom;
if (priv->impl == NULL)
return;
_clutter_stage_window_get_geometry (priv->impl, &geom);
if (min_height_p)
*min_height_p = geom.height;
if (natural_height_p)
*natural_height_p = geom.height;
}
static void
add_pick_stack_weak_refs (ClutterStage *stage)
{
ClutterStagePrivate *priv = stage->priv;
int i;
if (priv->pick_stack_frozen)
return;
for (i = 0; i < priv->pick_stack->len; i++)
{
PickRecord *rec = &g_array_index (priv->pick_stack, PickRecord, i);
if (rec->actor)
g_object_add_weak_pointer (G_OBJECT (rec->actor),
(gpointer) &rec->actor);
}
priv->pick_stack_frozen = TRUE;
}
static void
remove_pick_stack_weak_refs (ClutterStage *stage)
{
ClutterStagePrivate *priv = stage->priv;
int i;
if (!priv->pick_stack_frozen)
return;
for (i = 0; i < priv->pick_stack->len; i++)
{
PickRecord *rec = &g_array_index (priv->pick_stack, PickRecord, i);
if (rec->actor)
g_object_remove_weak_pointer (G_OBJECT (rec->actor),
(gpointer) &rec->actor);
}
priv->pick_stack_frozen = FALSE;
}
static void
_clutter_stage_clear_pick_stack (ClutterStage *stage)
{
ClutterStagePrivate *priv = stage->priv;
remove_pick_stack_weak_refs (stage);
g_array_set_size (priv->pick_stack, 0);
g_array_set_size (priv->pick_clip_stack, 0);
priv->pick_clip_stack_top = -1;
priv->cached_pick_mode = CLUTTER_PICK_NONE;
}
void
clutter_stage_log_pick (ClutterStage *stage,
const graphene_point_t *vertices,
ClutterActor *actor)
{
ClutterStagePrivate *priv;
PickRecord rec;
g_return_if_fail (CLUTTER_IS_STAGE (stage));
g_return_if_fail (actor != NULL);
priv = stage->priv;
g_assert (!priv->pick_stack_frozen);
memcpy (rec.vertex, vertices, 4 * sizeof (graphene_point_t));
rec.actor = actor;
rec.clip_stack_top = priv->pick_clip_stack_top;
g_array_append_val (priv->pick_stack, rec);
}
void
clutter_stage_push_pick_clip (ClutterStage *stage,
const graphene_point_t *vertices)
{
ClutterStagePrivate *priv;
PickClipRecord clip;
g_return_if_fail (CLUTTER_IS_STAGE (stage));
priv = stage->priv;
g_assert (!priv->pick_stack_frozen);
clip.prev = priv->pick_clip_stack_top;
memcpy (clip.vertex, vertices, 4 * sizeof (graphene_point_t));
g_array_append_val (priv->pick_clip_stack, clip);
priv->pick_clip_stack_top = priv->pick_clip_stack->len - 1;
}
void
clutter_stage_pop_pick_clip (ClutterStage *stage)
{
ClutterStagePrivate *priv;
const PickClipRecord *top;
g_return_if_fail (CLUTTER_IS_STAGE (stage));
priv = stage->priv;
g_assert (!priv->pick_stack_frozen);
g_assert (priv->pick_clip_stack_top >= 0);
/* Individual elements of pick_clip_stack are not freed. This is so they
* can be shared as part of a tree of different stacks used by different
* actors in the pick_stack. The whole pick_clip_stack does however get
* freed later in _clutter_stage_clear_pick_stack.
*/
top = &g_array_index (priv->pick_clip_stack,
PickClipRecord,
priv->pick_clip_stack_top);
priv->pick_clip_stack_top = top->prev;
}
static gboolean
is_quadrilateral_axis_aligned_rectangle (const graphene_point_t *vertices)
{
int i;
for (i = 0; i < 4; i++)
{
if (!G_APPROX_VALUE (vertices[i].x,
vertices[(i + 1) % 4].x,
FLT_EPSILON) &&
!G_APPROX_VALUE (vertices[i].y,
vertices[(i + 1) % 4].y,
FLT_EPSILON))
return FALSE;
}
return TRUE;
}
static gboolean
is_inside_axis_aligned_rectangle (const graphene_point_t *point,
const graphene_point_t *vertices)
{
float min_x = FLT_MAX;
float max_x = -FLT_MAX;
float min_y = FLT_MAX;
float max_y = -FLT_MAX;
int i;
for (i = 0; i < 3; i++)
{
min_x = MIN (min_x, vertices[i].x);
min_y = MIN (min_y, vertices[i].y);
max_x = MAX (max_x, vertices[i].x);
max_y = MAX (max_y, vertices[i].y);
}
return (point->x >= min_x &&
point->y >= min_y &&
point->x < max_x &&
point->y < max_y);
}
static int
clutter_point_compare_line (const graphene_point_t *p,
const graphene_point_t *a,
const graphene_point_t *b)
{
graphene_vec3_t vec_pa;
graphene_vec3_t vec_pb;
graphene_vec3_t cross;
float cross_z;
graphene_vec3_init (&vec_pa, p->x - a->x, p->y - a->y, 0.f);
graphene_vec3_init (&vec_pb, p->x - b->x, p->y - b->y, 0.f);
graphene_vec3_cross (&vec_pa, &vec_pb, &cross);
cross_z = graphene_vec3_get_z (&cross);
if (cross_z > 0.f)
return 1;
else if (cross_z < 0.f)
return -1;
else
return 0;
}
static gboolean
is_inside_unaligned_rectangle (const graphene_point_t *point,
const graphene_point_t *vertices)
{
unsigned int i;
int first_side;
first_side = 0;
for (i = 0; i < 4; i++)
{
int side;
side = clutter_point_compare_line (point,
&vertices[i],
&vertices[(i + 1) % 4]);
if (side)
{
if (first_side == 0)
first_side = side;
else if (side != first_side)
return FALSE;
}
}
if (first_side == 0)
return FALSE;
return TRUE;
}
static gboolean
is_inside_input_region (const graphene_point_t *point,
const graphene_point_t *vertices)
{
if (is_quadrilateral_axis_aligned_rectangle (vertices))
return is_inside_axis_aligned_rectangle (point, vertices);
else
return is_inside_unaligned_rectangle (point, vertices);
}
static gboolean
pick_record_contains_point (ClutterStage *stage,
const PickRecord *rec,
float x,
float y)
{
const graphene_point_t point = GRAPHENE_POINT_INIT (x, y);
ClutterStagePrivate *priv;
int clip_index;
if (!is_inside_input_region (&point, rec->vertex))
return FALSE;
priv = stage->priv;
clip_index = rec->clip_stack_top;
while (clip_index >= 0)
{
const PickClipRecord *clip = &g_array_index (priv->pick_clip_stack,
PickClipRecord,
clip_index);
if (!is_inside_input_region (&point, clip->vertex))
return FALSE;
clip_index = clip->prev;
}
return TRUE;
}
static void
clutter_stage_add_redraw_clip (ClutterStage *stage,
cairo_rectangle_int_t *clip)
{
GList *l;
for (l = _clutter_stage_peek_stage_views (stage); l; l = l->next)
{
ClutterStageView *view = l->data;
if (!clip)
{
clutter_stage_view_add_redraw_clip (view, NULL);
}
else
{
cairo_rectangle_int_t view_layout;
cairo_rectangle_int_t intersection;
clutter_stage_view_get_layout (view, &view_layout);
if (_clutter_util_rectangle_intersection (&view_layout, clip,
&intersection))
clutter_stage_view_add_redraw_clip (view, &intersection);
}
}
}
static inline void
queue_full_redraw (ClutterStage *stage)
{
ClutterStageWindow *stage_window;
if (CLUTTER_ACTOR_IN_DESTRUCTION (stage))
return;
clutter_actor_queue_redraw (CLUTTER_ACTOR (stage));
/* Just calling clutter_actor_queue_redraw will typically only
* redraw the bounding box of the children parented on the stage but
* in this case we really need to ensure that the full stage is
* redrawn so we add a NULL redraw clip to the stage window. */
stage_window = _clutter_stage_get_window (stage);
if (stage_window == NULL)
return;
clutter_stage_add_redraw_clip (stage, NULL);
}
static gboolean
stage_is_default (ClutterStage *stage)
{
ClutterStageManager *stage_manager;
ClutterStageWindow *impl;
stage_manager = clutter_stage_manager_get_default ();
if (stage != clutter_stage_manager_get_default_stage (stage_manager))
return FALSE;
impl = _clutter_stage_get_window (stage);
if (impl != _clutter_stage_get_default_window ())
return FALSE;
return TRUE;
}
static void
clutter_stage_allocate (ClutterActor *self,
const ClutterActorBox *box,
ClutterAllocationFlags flags)
{
ClutterStagePrivate *priv = CLUTTER_STAGE (self)->priv;
ClutterActorBox alloc = CLUTTER_ACTOR_BOX_INIT_ZERO;
float old_width, old_height;
float new_width, new_height;
float width, height;
cairo_rectangle_int_t window_size;
if (priv->impl == NULL)
return;
/* our old allocation */
clutter_actor_get_allocation_box (self, &alloc);
clutter_actor_box_get_size (&alloc, &old_width, &old_height);
/* the current allocation */
clutter_actor_box_get_size (box, &width, &height);
/* the current Stage implementation size */
_clutter_stage_window_get_geometry (priv->impl, &window_size);
/* if the stage is fixed size (for instance, it's using a EGL framebuffer)
* then we simply ignore any allocation request and override the
* allocation chain - because we cannot forcibly change the size of the
* stage window.
*/
if (!clutter_feature_available (CLUTTER_FEATURE_STAGE_STATIC))
{
CLUTTER_NOTE (LAYOUT,
"Following allocation to %.2fx%.2f (absolute origin %s)",
width, height,
(flags & CLUTTER_ABSOLUTE_ORIGIN_CHANGED)
? "changed"
: "not changed");
clutter_actor_set_allocation (self, box,
flags | CLUTTER_DELEGATE_LAYOUT);
/* Ensure the window is sized correctly */
if (priv->min_size_changed)
{
gfloat min_width, min_height;
gboolean min_width_set, min_height_set;
g_object_get (G_OBJECT (self),
"min-width", &min_width,
"min-width-set", &min_width_set,
"min-height", &min_height,
"min-height-set", &min_height_set,
NULL);
if (!min_width_set)
min_width = 1;
if (!min_height_set)
min_height = 1;
if (width < min_width)
width = min_width;
if (height < min_height)
height = min_height;
priv->min_size_changed = FALSE;
}
if (window_size.width != CLUTTER_NEARBYINT (width) ||
window_size.height != CLUTTER_NEARBYINT (height))
{
_clutter_stage_window_resize (priv->impl,
CLUTTER_NEARBYINT (width),
CLUTTER_NEARBYINT (height));
}
}
else
{
ClutterActorBox override = { 0, };
/* override the passed allocation */
override.x1 = 0;
override.y1 = 0;
override.x2 = window_size.width;
override.y2 = window_size.height;
CLUTTER_NOTE (LAYOUT,
"Overriding original allocation of %.2fx%.2f "
"with %.2fx%.2f (absolute origin %s)",
width, height,
override.x2, override.y2,
(flags & CLUTTER_ABSOLUTE_ORIGIN_CHANGED)
? "changed"
: "not changed");
/* and store the overridden allocation */
clutter_actor_set_allocation (self, &override,
flags | CLUTTER_DELEGATE_LAYOUT);
}
/* reset the viewport if the allocation effectively changed */
clutter_actor_get_allocation_box (self, &alloc);
clutter_actor_box_get_size (&alloc, &new_width, &new_height);
if (CLUTTER_NEARBYINT (old_width) != CLUTTER_NEARBYINT (new_width) ||
CLUTTER_NEARBYINT (old_height) != CLUTTER_NEARBYINT (new_height))
{
int real_width = CLUTTER_NEARBYINT (new_width);
int real_height = CLUTTER_NEARBYINT (new_height);
_clutter_stage_set_viewport (CLUTTER_STAGE (self),
0, 0,
real_width,
real_height);
/* Note: we don't assume that set_viewport will queue a full redraw
* since it may bail-out early if something preemptively set the
* viewport before the stage was really allocated its new size.
*/
queue_full_redraw (CLUTTER_STAGE (self));
}
}
typedef struct _Vector4
{
float x, y, z, w;
} Vector4;
static void
_cogl_util_get_eye_planes_for_screen_poly (float *polygon,
int n_vertices,
float *viewport,
const CoglMatrix *projection,
const CoglMatrix *inverse_project,
ClutterPlane *planes)
{
float Wc;
Vector4 *tmp_poly;
ClutterPlane *plane;
int i;
Vector4 *poly;
graphene_vec3_t b;
graphene_vec3_t c;
int count;
tmp_poly = g_alloca (sizeof (Vector4) * n_vertices * 2);
#define DEPTH -50
/* Determine W in clip-space (Wc) for a point (0, 0, DEPTH, 1)
*
* Note: the depth could be anything except 0.
*
* We will transform the polygon into clip coordinates using this
* depth and then into eye coordinates. Our clip planes will be
* defined by triangles that extend between points of the polygon at
* DEPTH and corresponding points of the same polygon at DEPTH * 2.
*
* NB: Wc defines the position of the clip planes in clip
* coordinates. Given a screen aligned cross section through the
* frustum; coordinates range from [-Wc,Wc] left to right on the
* x-axis and [Wc,-Wc] top to bottom on the y-axis.
*/
Wc = DEPTH * projection->wz + projection->ww;
#define CLIP_X(X) ((((float)X - viewport[0]) * (2.0 / viewport[2])) - 1) * Wc
#define CLIP_Y(Y) ((((float)Y - viewport[1]) * (2.0 / viewport[3])) - 1) * -Wc
for (i = 0; i < n_vertices; i++)
{
tmp_poly[i].x = CLIP_X (polygon[i * 2]);
tmp_poly[i].y = CLIP_Y (polygon[i * 2 + 1]);
tmp_poly[i].z = DEPTH;
tmp_poly[i].w = Wc;
}
Wc = DEPTH * 2 * projection->wz + projection->ww;
/* FIXME: technically we don't need to project all of the points
* twice, it would be enough project every other point since
* we can share points in this set to define the plane vectors. */
for (i = 0; i < n_vertices; i++)
{
tmp_poly[n_vertices + i].x = CLIP_X (polygon[i * 2]);
tmp_poly[n_vertices + i].y = CLIP_Y (polygon[i * 2 + 1]);
tmp_poly[n_vertices + i].z = DEPTH * 2;
tmp_poly[n_vertices + i].w = Wc;
}
#undef CLIP_X
#undef CLIP_Y
cogl_matrix_project_points (inverse_project,
4,
sizeof (Vector4),
tmp_poly,
sizeof (Vector4),
tmp_poly,
n_vertices * 2);
/* XXX: It's quite ugly that we end up with these casts between
* Vector4 types and CoglVector3s, it might be better if the
* cogl_vector APIs just took pointers to floats.
*/
count = n_vertices - 1;
for (i = 0; i < count; i++)
{
plane = &planes[i];
poly = &tmp_poly[i];
graphene_vec3_init (&plane->v0, poly->x, poly->y, poly->z);
poly = &tmp_poly[n_vertices + i];
graphene_vec3_init (&b, poly->x, poly->y, poly->z);
poly = &tmp_poly[n_vertices + i + 1];
graphene_vec3_init (&c, poly->x, poly->y, poly->z);
graphene_vec3_subtract (&b, &plane->v0, &b);
graphene_vec3_subtract (&c, &plane->v0, &c);
graphene_vec3_cross (&b, &c, &plane->n);
graphene_vec3_normalize (&plane->n, &plane->n);
}
plane = &planes[n_vertices - 1];
poly = &tmp_poly[0];
graphene_vec3_init (&plane->v0, poly->x, poly->y, poly->z);
poly = &tmp_poly[2 * n_vertices - 1];
graphene_vec3_init (&b, poly->x, poly->y, poly->z);
poly = &tmp_poly[n_vertices];
graphene_vec3_init (&c, poly->x, poly->y, poly->z);
graphene_vec3_subtract (&b, &plane->v0, &b);
graphene_vec3_subtract (&c, &plane->v0, &c);
graphene_vec3_cross (&b, &c, &plane->n);
graphene_vec3_normalize (&plane->n, &plane->n);
}
/* XXX: Instead of having a toplevel 2D clip region, it might be
* better to have a clip volume within the view frustum. This could
* allow us to avoid projecting actors into window coordinates to
* be able to cull them.
*/
static void
setup_view_for_pick_or_paint (ClutterStage *stage,
ClutterStageView *view,
const cairo_rectangle_int_t *clip)
{
ClutterStagePrivate *priv = stage->priv;
cairo_rectangle_int_t view_layout;
float clip_poly[8];
float viewport[4];
cairo_rectangle_int_t geom;
/* Any mode of painting/picking invalidates the pick cache, unless we're
* in the middle of building it. So we reset the cached flag but don't
* completely clear the pick stack.
*/
priv->cached_pick_mode = CLUTTER_PICK_NONE;
_clutter_stage_window_get_geometry (priv->impl, &geom);
viewport[0] = priv->viewport[0];
viewport[1] = priv->viewport[1];
viewport[2] = priv->viewport[2];
viewport[3] = priv->viewport[3];
if (!clip)
{
clutter_stage_view_get_layout (view, &view_layout);
clip = &view_layout;
}
clip_poly[0] = MAX (clip->x, 0);
clip_poly[1] = MAX (clip->y, 0);
clip_poly[2] = MIN (clip->x + clip->width, geom.width);
clip_poly[3] = clip_poly[1];
clip_poly[4] = clip_poly[2];
clip_poly[5] = MIN (clip->y + clip->height, geom.height);
clip_poly[6] = clip_poly[0];
clip_poly[7] = clip_poly[5];
CLUTTER_NOTE (CLIPPING, "Setting stage clip too: "
"x=%f, y=%f, width=%f, height=%f",
clip_poly[0], clip_poly[1],
clip_poly[2] - clip_poly[0],
clip_poly[5] - clip_poly[1]);
_cogl_util_get_eye_planes_for_screen_poly (clip_poly,
4,
viewport,
&priv->projection,
&priv->inverse_projection,
priv->current_clip_planes);
_clutter_stage_paint_volume_stack_free_all (stage);
}
static void
clutter_stage_do_paint_view (ClutterStage *stage,
ClutterStageView *view,
const cairo_region_t *redraw_clip)
{
ClutterPaintContext *paint_context;
cairo_rectangle_int_t clip_rect;
paint_context = clutter_paint_context_new_for_view (view, redraw_clip);
cairo_region_get_extents (redraw_clip, &clip_rect);
setup_view_for_pick_or_paint (stage, view, &clip_rect);
clutter_actor_paint (CLUTTER_ACTOR (stage), paint_context);
clutter_paint_context_destroy (paint_context);
}
/* This provides a common point of entry for painting the scenegraph
* for picking or painting...
*/
void
clutter_stage_paint_view (ClutterStage *stage,
ClutterStageView *view,
const cairo_region_t *redraw_clip)
{
ClutterStagePrivate *priv = stage->priv;
if (!priv->impl)
return;
COGL_TRACE_BEGIN_SCOPED (ClutterStagePaintView, "Paint (view)");
if (g_signal_has_handler_pending (stage, stage_signals[PAINT_VIEW],
0, TRUE))
g_signal_emit (stage, stage_signals[PAINT_VIEW], 0, view, redraw_clip);
else
CLUTTER_STAGE_GET_CLASS (stage)->paint_view (stage, view, redraw_clip);
}
void
_clutter_stage_emit_after_paint (ClutterStage *stage)
{
g_signal_emit (stage, stage_signals[AFTER_PAINT], 0);
}
/* If we don't implement this here, we get the paint function
* from the deprecated clutter-group class, which doesn't
* respect the Z order as it uses our empty sort_depth_order.
*/
static void
clutter_stage_paint (ClutterActor *self,
ClutterPaintContext *paint_context)
{
ClutterActorIter iter;
ClutterActor *child;
clutter_actor_iter_init (&iter, self);
while (clutter_actor_iter_next (&iter, &child))
clutter_actor_paint (child, paint_context);
}
static void
clutter_stage_pick (ClutterActor *self,
ClutterPickContext *pick_context)
{
ClutterActorIter iter;
ClutterActor *child;
/* Note: we don't chain up to our parent as we don't want any geometry
* emitted for the stage itself. The stage's pick id is effectively handled
* by the call to cogl_clear done in clutter-main.c:_clutter_do_pick_async()
*/
clutter_actor_iter_init (&iter, self);
while (clutter_actor_iter_next (&iter, &child))
clutter_actor_pick (child, pick_context);
}
static gboolean
clutter_stage_get_paint_volume (ClutterActor *self,
ClutterPaintVolume *volume)
{
/* Returning False effectively means Clutter has to assume it covers
* everything... */
return FALSE;
}
static void
clutter_stage_realize (ClutterActor *self)
{
ClutterStagePrivate *priv = CLUTTER_STAGE (self)->priv;
gboolean is_realized;
g_assert (priv->impl != NULL);
is_realized = _clutter_stage_window_realize (priv->impl);
if (!is_realized)
CLUTTER_ACTOR_UNSET_FLAGS (self, CLUTTER_ACTOR_REALIZED);
}
static void
clutter_stage_unrealize (ClutterActor *self)
{
ClutterStagePrivate *priv = CLUTTER_STAGE (self)->priv;
/* and then unrealize the implementation */
g_assert (priv->impl != NULL);
_clutter_stage_window_unrealize (priv->impl);
CLUTTER_ACTOR_UNSET_FLAGS (self, CLUTTER_ACTOR_REALIZED);
}
static void
clutter_stage_show_all (ClutterActor *self)
{
ClutterActorIter iter;
ClutterActor *child;
/* we don't do a recursive show_all(), to maintain the old
* invariants from ClutterGroup
*/
clutter_actor_iter_init (&iter, self);
while (clutter_actor_iter_next (&iter, &child))
clutter_actor_show (child);
clutter_actor_show (self);
}
static void
clutter_stage_show (ClutterActor *self)
{
ClutterStagePrivate *priv = CLUTTER_STAGE (self)->priv;
CLUTTER_ACTOR_CLASS (clutter_stage_parent_class)->show (self);
/* Possibly do an allocation run so that the stage will have the
right size before we map it */
_clutter_stage_maybe_relayout (self);
g_assert (priv->impl != NULL);
_clutter_stage_window_show (priv->impl, TRUE);
}
static void
clutter_stage_hide_all (ClutterActor *self)
{
ClutterActorIter iter;
ClutterActor *child;
clutter_actor_hide (self);
/* we don't do a recursive hide_all(), to maintain the old invariants
* from ClutterGroup
*/
clutter_actor_iter_init (&iter, self);
while (clutter_actor_iter_next (&iter, &child))
clutter_actor_hide (child);
}
static void
clutter_stage_hide (ClutterActor *self)
{
ClutterStagePrivate *priv = CLUTTER_STAGE (self)->priv;
g_assert (priv->impl != NULL);
_clutter_stage_window_hide (priv->impl);
CLUTTER_ACTOR_CLASS (clutter_stage_parent_class)->hide (self);
}
static void
clutter_stage_emit_key_focus_event (ClutterStage *stage,
gboolean focus_in)
{
ClutterStagePrivate *priv = stage->priv;
if (priv->key_focused_actor == NULL)
return;
_clutter_actor_set_has_key_focus (CLUTTER_ACTOR (stage), focus_in);
g_object_notify_by_pspec (G_OBJECT (stage), obj_props[PROP_KEY_FOCUS]);
}
static void
clutter_stage_real_activate (ClutterStage *stage)
{
clutter_stage_emit_key_focus_event (stage, TRUE);
}
static void
clutter_stage_real_deactivate (ClutterStage *stage)
{
clutter_stage_emit_key_focus_event (stage, FALSE);
}
void
_clutter_stage_queue_event (ClutterStage *stage,
ClutterEvent *event,
gboolean copy_event)
{
ClutterStagePrivate *priv;
gboolean first_event;
ClutterInputDevice *device;
g_return_if_fail (CLUTTER_IS_STAGE (stage));
priv = stage->priv;
first_event = priv->event_queue->length == 0;
if (copy_event)
event = clutter_event_copy (event);
/* if needed, update the state of the input device of the event.
* we do it here to avoid calling the same code from every backend
* event processing function
*/
device = clutter_event_get_device (event);
if (device != NULL &&
event->type != CLUTTER_PROXIMITY_IN &&
event->type != CLUTTER_PROXIMITY_OUT)
{
ClutterModifierType event_state = clutter_event_get_state (event);
ClutterEventSequence *sequence = clutter_event_get_event_sequence (event);
guint32 event_time = clutter_event_get_time (event);
gfloat event_x, event_y;
clutter_event_get_coords (event, &event_x, &event_y);
_clutter_input_device_set_coords (device, sequence, event_x, event_y, stage);
_clutter_input_device_set_state (device, event_state);
_clutter_input_device_set_time (device, event_time);
}
if (first_event)
{
gboolean compressible = event->type == CLUTTER_MOTION ||
event->type == CLUTTER_TOUCH_UPDATE;
if (!compressible)
{
_clutter_process_event (event);
clutter_event_free (event);
return;
}
}
g_queue_push_tail (priv->event_queue, event);
if (first_event)
{
ClutterMasterClock *master_clock = _clutter_master_clock_get_default ();
_clutter_master_clock_start_running (master_clock);
_clutter_stage_schedule_update (stage);
}
}
gboolean
_clutter_stage_has_queued_events (ClutterStage *stage)
{
ClutterStagePrivate *priv;
g_return_val_if_fail (CLUTTER_IS_STAGE (stage), FALSE);
priv = stage->priv;
return priv->event_queue->length > 0;
}
void
_clutter_stage_process_queued_events (ClutterStage *stage)
{
ClutterStagePrivate *priv;
GList *events, *l;
g_return_if_fail (CLUTTER_IS_STAGE (stage));
priv = stage->priv;
if (priv->event_queue->length == 0)
return;
/* In case the stage gets destroyed during event processing */
g_object_ref (stage);
/* Steal events before starting processing to avoid reentrancy
* issues */
events = priv->event_queue->head;
priv->event_queue->head = NULL;
priv->event_queue->tail = NULL;
priv->event_queue->length = 0;
for (l = events; l != NULL; l = l->next)
{
ClutterEvent *event;
ClutterEvent *next_event;
ClutterInputDevice *device;
ClutterInputDevice *next_device;
ClutterInputDeviceType device_type;
gboolean check_device = FALSE;
event = l->data;
next_event = l->next ? l->next->data : NULL;
device = clutter_event_get_device (event);
if (next_event != NULL)
next_device = clutter_event_get_device (next_event);
else
next_device = NULL;
if (device != NULL && next_device != NULL)
check_device = TRUE;
device_type = clutter_input_device_get_device_type (device);
/* Skip consecutive motion events coming from the same device,
* except those of tablet tools, since users of these events
* want no precision loss.
*/
if (priv->throttle_motion_events && next_event != NULL &&
device_type != CLUTTER_TABLET_DEVICE &&
device_type != CLUTTER_PEN_DEVICE &&
device_type != CLUTTER_ERASER_DEVICE)
{
if (event->type == CLUTTER_MOTION &&
(next_event->type == CLUTTER_MOTION ||
next_event->type == CLUTTER_LEAVE) &&
(!check_device || (device == next_device)))
{
CLUTTER_NOTE (EVENT,
"Omitting motion event at %d, %d",
(int) event->motion.x,
(int) event->motion.y);
if (next_event->type == CLUTTER_MOTION)
{
ClutterSeat *seat = clutter_input_device_get_seat (device);
clutter_seat_compress_motion (seat, next_event, event);
}
goto next_event;
}
else if (event->type == CLUTTER_TOUCH_UPDATE &&
next_event->type == CLUTTER_TOUCH_UPDATE &&
event->touch.sequence == next_event->touch.sequence &&
(!check_device || (device == next_device)))
{
CLUTTER_NOTE (EVENT,
"Omitting touch update event at %d, %d",
(int) event->touch.x,
(int) event->touch.y);
goto next_event;
}
}
_clutter_process_event (event);
next_event:
clutter_event_free (event);
}
g_list_free (events);
g_object_unref (stage);
}
/**
* _clutter_stage_needs_update:
* @stage: A #ClutterStage
*
* Determines if _clutter_stage_do_update() needs to be called.
*
* Return value: %TRUE if the stage need layout or painting
*/
gboolean
_clutter_stage_needs_update (ClutterStage *stage)
{
ClutterStagePrivate *priv;
g_return_val_if_fail (CLUTTER_IS_STAGE (stage), FALSE);
priv = stage->priv;
return priv->redraw_pending || g_hash_table_size (priv->pending_relayouts) > 0;
}
void
clutter_stage_queue_actor_relayout (ClutterStage *stage,
ClutterActor *actor)
{
ClutterStagePrivate *priv = stage->priv;
if (g_hash_table_contains (priv->pending_relayouts, stage))
return;
if (g_hash_table_size (priv->pending_relayouts) == 0)
_clutter_stage_schedule_update (stage);
if (actor == (ClutterActor *) stage)
g_hash_table_remove_all (priv->pending_relayouts);
g_hash_table_add (priv->pending_relayouts, g_object_ref (actor));
priv->pending_relayouts_version++;
}
void
_clutter_stage_maybe_relayout (ClutterActor *actor)
{
ClutterStage *stage = CLUTTER_STAGE (actor);
ClutterStagePrivate *priv = stage->priv;
GHashTableIter iter;
gpointer key;
int count = 0;
/* No work to do? Avoid the extraneous debug log messages too. */
if (g_hash_table_size (priv->pending_relayouts) == 0)
return;
CLUTTER_NOTE (ACTOR, ">>> Recomputing layout");
g_hash_table_iter_init (&iter, priv->pending_relayouts);
while (g_hash_table_iter_next (&iter, &key, NULL))
{
g_autoptr (ClutterActor) queued_actor = key;
unsigned int old_version;
g_hash_table_iter_steal (&iter);
priv->pending_relayouts_version++;
if (CLUTTER_ACTOR_IN_RELAYOUT (queued_actor)) /* avoid reentrancy */
continue;
/* An actor may have been destroyed or hidden between queuing and now */
if (clutter_actor_get_stage (queued_actor) != actor)
continue;
if (queued_actor == actor)
CLUTTER_NOTE (ACTOR, " Deep relayout of stage %s",
_clutter_actor_get_debug_name (queued_actor));
else
CLUTTER_NOTE (ACTOR, " Shallow relayout of actor %s",
_clutter_actor_get_debug_name (queued_actor));
CLUTTER_SET_PRIVATE_FLAGS (queued_actor, CLUTTER_IN_RELAYOUT);
old_version = priv->pending_relayouts_version;
clutter_actor_allocate_preferred_size (queued_actor,
CLUTTER_ALLOCATION_NONE);
CLUTTER_UNSET_PRIVATE_FLAGS (queued_actor, CLUTTER_IN_RELAYOUT);
count++;
/* Prevent using an iterator that's been invalidated */
if (old_version != priv->pending_relayouts_version)
g_hash_table_iter_init (&iter, priv->pending_relayouts);
}
CLUTTER_NOTE (ACTOR, "<<< Completed recomputing layout of %d subtrees", count);
if (count)
priv->stage_was_relayout = TRUE;
}
static void
clutter_stage_do_redraw (ClutterStage *stage)
{
ClutterActor *actor = CLUTTER_ACTOR (stage);
ClutterStagePrivate *priv = stage->priv;
if (CLUTTER_ACTOR_IN_DESTRUCTION (stage))
return;
if (priv->impl == NULL)
return;
CLUTTER_NOTE (PAINT, "Redraw started for stage '%s'[%p]",
_clutter_actor_get_debug_name (actor),
stage);
if (_clutter_context_get_show_fps ())
{
if (priv->fps_timer == NULL)
priv->fps_timer = g_timer_new ();
}
_clutter_stage_window_redraw (priv->impl);
if (_clutter_context_get_show_fps ())
{
priv->timer_n_frames += 1;
if (g_timer_elapsed (priv->fps_timer, NULL) >= 1.0)
{
g_print ("*** FPS for %s: %i ***\n",
_clutter_actor_get_debug_name (actor),
priv->timer_n_frames);
priv->timer_n_frames = 0;
g_timer_start (priv->fps_timer);
}
}
CLUTTER_NOTE (PAINT, "Redraw finished for stage '%s'[%p]",
_clutter_actor_get_debug_name (actor),
stage);
}
static GSList *
_clutter_stage_check_updated_pointers (ClutterStage *stage)
{
ClutterBackend *backend;
ClutterSeat *seat;
GSList *updating = NULL;
GList *l, *devices;
graphene_point_t point;
backend = clutter_get_default_backend ();
seat = clutter_backend_get_default_seat (backend);
devices = clutter_seat_list_devices (seat);
for (l = devices; l; l = l->next)
{
ClutterInputDevice *dev = l->data;
ClutterStageView *view;
const cairo_region_t *clip;
if (clutter_input_device_get_device_mode (dev) !=
CLUTTER_INPUT_MODE_MASTER)
continue;
switch (clutter_input_device_get_device_type (dev))
{
case CLUTTER_POINTER_DEVICE:
case CLUTTER_TABLET_DEVICE:
case CLUTTER_PEN_DEVICE:
case CLUTTER_ERASER_DEVICE:
case CLUTTER_CURSOR_DEVICE:
if (!clutter_input_device_get_coords (dev, NULL, &point))
continue;
view = clutter_stage_get_view_at (stage, point.x, point.y);
if (!view)
continue;
clip = clutter_stage_view_peek_redraw_clip (view);
if (!clip || cairo_region_contains_point (clip, point.x, point.y))
updating = g_slist_prepend (updating, dev);
break;
default:
/* Any other devices don't need checking, either because they
* don't have x/y coordinates, or because they're implicitly
* grabbed on an actor by default as it's the case of
* touch(screens).
*/
break;
}
}
g_list_free (devices);
return updating;
}
/**
* _clutter_stage_do_update:
* @stage: A #ClutterStage
*
* Handles per-frame layout and repaint for the stage.
*
* Return value: %TRUE if the stage was updated
*/
gboolean
_clutter_stage_do_update (ClutterStage *stage)
{
ClutterStagePrivate *priv = stage->priv;
gboolean stage_was_relayout = priv->stage_was_relayout;
GSList *pointers = NULL;
priv->stage_was_relayout = FALSE;
/* if the stage is being destroyed, or if the destruction already
* happened and we don't have an StageWindow any more, then we
* should bail out
*/
if (CLUTTER_ACTOR_IN_DESTRUCTION (stage) || priv->impl == NULL)
return FALSE;
if (!CLUTTER_ACTOR_IS_REALIZED (stage))
return FALSE;
COGL_TRACE_BEGIN_SCOPED (ClutterStageDoUpdate, "Update");
/* NB: We need to ensure we have an up to date layout *before* we
* check or clear the pending redraws flag since a relayout may
* queue a redraw.
*/
COGL_TRACE_BEGIN (ClutterStageRelayout, "Layout");
_clutter_stage_maybe_relayout (CLUTTER_ACTOR (stage));
COGL_TRACE_END (ClutterStageRelayout);
if (!priv->redraw_pending)
return FALSE;
if (stage_was_relayout)
pointers = _clutter_stage_check_updated_pointers (stage);
COGL_TRACE_BEGIN (ClutterStagePaint, "Paint");
clutter_stage_maybe_finish_queue_redraws (stage);
clutter_stage_do_redraw (stage);
COGL_TRACE_END (ClutterStagePaint);
/* reset the guard, so that new redraws are possible */
priv->redraw_pending = FALSE;
#ifdef CLUTTER_ENABLE_DEBUG
if (priv->redraw_count > 0)
{
CLUTTER_NOTE (SCHEDULER, "Queued %lu redraws during the last cycle",
priv->redraw_count);
priv->redraw_count = 0;
}
#endif /* CLUTTER_ENABLE_DEBUG */
COGL_TRACE_BEGIN (ClutterStagePick, "Pick");
while (pointers)
{
clutter_input_device_update (pointers->data, NULL, TRUE);
pointers = g_slist_delete_link (pointers, pointers);
}
COGL_TRACE_END (ClutterStagePick);
return TRUE;
}
static void
clutter_stage_real_queue_relayout (ClutterActor *self)
{
ClutterStage *stage = CLUTTER_STAGE (self);
ClutterActorClass *parent_class;
clutter_stage_queue_actor_relayout (stage, self);
/* chain up */
parent_class = CLUTTER_ACTOR_CLASS (clutter_stage_parent_class);
parent_class->queue_relayout (self);
}
static gboolean
is_full_stage_redraw_queued (ClutterStage *stage)
{
GList *l;
for (l = _clutter_stage_peek_stage_views (stage); l; l = l->next)
{
ClutterStageView *view = l->data;
if (!clutter_stage_view_has_full_redraw_clip (view))
return FALSE;
}
return TRUE;
}
static gboolean
clutter_stage_real_queue_redraw (ClutterActor *actor,
ClutterActor *leaf,
ClutterPaintVolume *redraw_clip)
{
ClutterStage *stage = CLUTTER_STAGE (actor);
ClutterStageWindow *stage_window;
ClutterActorBox bounding_box;
ClutterActorBox intersection_box;
cairo_rectangle_int_t geom, stage_clip;
if (CLUTTER_ACTOR_IN_DESTRUCTION (actor))
return TRUE;
/* If the backend can't do anything with redraw clips (e.g. it already knows
* it needs to redraw everything anyway) then don't spend time transforming
* any clip volume into stage coordinates... */
stage_window = _clutter_stage_get_window (stage);
if (stage_window == NULL)
return TRUE;
if (is_full_stage_redraw_queued (stage))
return FALSE;
if (redraw_clip == NULL)
{
clutter_stage_add_redraw_clip (stage, NULL);
return FALSE;
}
if (redraw_clip->is_empty)
return TRUE;
/* Convert the clip volume into stage coordinates and then into an
* axis aligned stage coordinates bounding box... */
_clutter_paint_volume_get_stage_paint_box (redraw_clip,
stage,
&bounding_box);
_clutter_stage_window_get_geometry (stage_window, &geom);
intersection_box.x1 = MAX (bounding_box.x1, 0);
intersection_box.y1 = MAX (bounding_box.y1, 0);
intersection_box.x2 = MIN (bounding_box.x2, geom.width);
intersection_box.y2 = MIN (bounding_box.y2, geom.height);
/* There is no need to track degenerate/empty redraw clips */
if (intersection_box.x2 <= intersection_box.x1 ||
intersection_box.y2 <= intersection_box.y1)
return TRUE;
/* when converting to integer coordinates make sure we round the edges of the
* clip rectangle outwards... */
stage_clip.x = intersection_box.x1;
stage_clip.y = intersection_box.y1;
stage_clip.width = intersection_box.x2 - stage_clip.x;
stage_clip.height = intersection_box.y2 - stage_clip.y;
clutter_stage_add_redraw_clip (stage, &stage_clip);
return FALSE;
}
gboolean
_clutter_stage_has_full_redraw_queued (ClutterStage *stage)
{
if (CLUTTER_ACTOR_IN_DESTRUCTION (stage))
return FALSE;
if (!stage->priv->redraw_pending)
return FALSE;
return is_full_stage_redraw_queued (stage);
}
static ClutterActor *
_clutter_stage_do_pick_on_view (ClutterStage *stage,
float x,
float y,
ClutterPickMode mode,
ClutterStageView *view)
{
ClutterMainContext *context = _clutter_context_get_default ();
ClutterStagePrivate *priv = stage->priv;
int i;
g_assert (context->pick_mode == CLUTTER_PICK_NONE);
if (mode != priv->cached_pick_mode)
{
ClutterPickContext *pick_context;
_clutter_stage_clear_pick_stack (stage);
pick_context = clutter_pick_context_new_for_view (view);
context->pick_mode = mode;
setup_view_for_pick_or_paint (stage, view, NULL);
clutter_actor_pick (CLUTTER_ACTOR (stage), pick_context);
context->pick_mode = CLUTTER_PICK_NONE;
priv->cached_pick_mode = mode;
clutter_pick_context_destroy (pick_context);
add_pick_stack_weak_refs (stage);
}
/* Search all "painted" pickable actors from front to back. A linear search
* is required, and also performs fine since there is typically only
* on the order of dozens of actors in the list (on screen) at a time.
*/
for (i = priv->pick_stack->len - 1; i >= 0; i--)
{
const PickRecord *rec = &g_array_index (priv->pick_stack, PickRecord, i);
if (rec->actor && pick_record_contains_point (stage, rec, x, y))
return rec->actor;
}
return CLUTTER_ACTOR (stage);
}
/**
* clutter_stage_get_view_at: (skip)
*/
ClutterStageView *
clutter_stage_get_view_at (ClutterStage *stage,
float x,
float y)
{
ClutterStagePrivate *priv = stage->priv;
GList *l;
for (l = _clutter_stage_window_get_views (priv->impl); l; l = l->next)
{
ClutterStageView *view = l->data;
cairo_rectangle_int_t view_layout;
clutter_stage_view_get_layout (view, &view_layout);
if (x >= view_layout.x &&
x < view_layout.x + view_layout.width &&
y >= view_layout.y &&
y < view_layout.y + view_layout.height)
return view;
}
return NULL;
}
ClutterActor *
_clutter_stage_do_pick (ClutterStage *stage,
float x,
float y,
ClutterPickMode mode)
{
ClutterActor *actor = CLUTTER_ACTOR (stage);
ClutterStagePrivate *priv = stage->priv;
float stage_width, stage_height;
ClutterStageView *view = NULL;
priv = stage->priv;
if (CLUTTER_ACTOR_IN_DESTRUCTION (stage))
return actor;
if (G_UNLIKELY (clutter_pick_debug_flags & CLUTTER_DEBUG_NOP_PICKING))
return actor;
if (G_UNLIKELY (priv->impl == NULL))
return actor;
clutter_actor_get_size (CLUTTER_ACTOR (stage), &stage_width, &stage_height);
if (x < 0 || x >= stage_width || y < 0 || y >= stage_height)
return actor;
view = clutter_stage_get_view_at (stage, x, y);
if (view)
return _clutter_stage_do_pick_on_view (stage, x, y, mode, view);
return actor;
}
static gboolean
clutter_stage_real_delete_event (ClutterStage *stage,
ClutterEvent *event)
{
if (stage_is_default (stage))
clutter_main_quit ();
else
clutter_actor_destroy (CLUTTER_ACTOR (stage));
return CLUTTER_EVENT_STOP;
}
static void
clutter_stage_real_apply_transform (ClutterActor *stage,
CoglMatrix *matrix)
{
ClutterStagePrivate *priv = CLUTTER_STAGE (stage)->priv;
/* FIXME: we probably shouldn't be explicitly reseting the matrix
* here... */
cogl_matrix_init_identity (matrix);
cogl_matrix_multiply (matrix, matrix, &priv->view);
}
static void
clutter_stage_constructed (GObject *gobject)
{
ClutterStage *self = CLUTTER_STAGE (gobject);
ClutterStageManager *stage_manager;
stage_manager = clutter_stage_manager_get_default ();
/* this will take care to sinking the floating reference */
_clutter_stage_manager_add_stage (stage_manager, self);
/* if this stage has been created on a backend that does not
* support multiple stages then it becomes the default stage
* as well; any other attempt at creating a ClutterStage will
* fail.
*/
if (!clutter_feature_available (CLUTTER_FEATURE_STAGE_MULTIPLE))
{
if (G_UNLIKELY (clutter_stage_manager_get_default_stage (stage_manager) != NULL))
{
g_error ("Unable to create another stage: the backend of "
"type '%s' does not support multiple stages. Use "
"clutter_stage_manager_get_default_stage() instead "
"to access the stage singleton.",
G_OBJECT_TYPE_NAME (clutter_get_default_backend ()));
}
_clutter_stage_manager_set_default_stage (stage_manager, self);
}
G_OBJECT_CLASS (clutter_stage_parent_class)->constructed (gobject);
}
static void
clutter_stage_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterStage *stage = CLUTTER_STAGE (object);
switch (prop_id)
{
case PROP_COLOR:
clutter_actor_set_background_color (CLUTTER_ACTOR (stage),
clutter_value_get_color (value));
break;
case PROP_CURSOR_VISIBLE:
if (g_value_get_boolean (value))
clutter_stage_show_cursor (stage);
else
clutter_stage_hide_cursor (stage);
break;
case PROP_PERSPECTIVE:
clutter_stage_set_perspective (stage, g_value_get_boxed (value));
break;
case PROP_TITLE:
clutter_stage_set_title (stage, g_value_get_string (value));
break;
case PROP_USE_ALPHA:
clutter_stage_set_use_alpha (stage, g_value_get_boolean (value));
break;
case PROP_KEY_FOCUS:
clutter_stage_set_key_focus (stage, g_value_get_object (value));
break;
case PROP_ACCEPT_FOCUS:
clutter_stage_set_accept_focus (stage, g_value_get_boolean (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
clutter_stage_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ClutterStagePrivate *priv = CLUTTER_STAGE (gobject)->priv;
switch (prop_id)
{
case PROP_COLOR:
{
ClutterColor bg_color;
clutter_actor_get_background_color (CLUTTER_ACTOR (gobject),
&bg_color);
clutter_value_set_color (value, &bg_color);
}
break;
case PROP_CURSOR_VISIBLE:
g_value_set_boolean (value, priv->is_cursor_visible);
break;
case PROP_PERSPECTIVE:
g_value_set_boxed (value, &priv->perspective);
break;
case PROP_TITLE:
g_value_set_string (value, priv->title);
break;
case PROP_USE_ALPHA:
g_value_set_boolean (value, priv->use_alpha);
break;
case PROP_KEY_FOCUS:
g_value_set_object (value, priv->key_focused_actor);
break;
case PROP_ACCEPT_FOCUS:
g_value_set_boolean (value, priv->accept_focus);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_stage_dispose (GObject *object)
{
ClutterStage *stage = CLUTTER_STAGE (object);
ClutterStagePrivate *priv = stage->priv;
ClutterStageManager *stage_manager;
clutter_actor_hide (CLUTTER_ACTOR (object));
_clutter_clear_events_queue_for_stage (stage);
if (priv->impl != NULL)
{
CLUTTER_NOTE (BACKEND, "Disposing of the stage implementation");
if (CLUTTER_ACTOR_IS_REALIZED (object))
_clutter_stage_window_unrealize (priv->impl);
g_object_unref (priv->impl);
priv->impl = NULL;
}
clutter_actor_destroy_all_children (CLUTTER_ACTOR (object));
g_list_free_full (priv->pending_queue_redraws,
(GDestroyNotify) free_queue_redraw_entry);
priv->pending_queue_redraws = NULL;
g_clear_pointer (&priv->pending_relayouts, g_hash_table_destroy);
/* this will release the reference on the stage */
stage_manager = clutter_stage_manager_get_default ();
_clutter_stage_manager_remove_stage (stage_manager, stage);
G_OBJECT_CLASS (clutter_stage_parent_class)->dispose (object);
}
static void
clutter_stage_finalize (GObject *object)
{
ClutterStage *stage = CLUTTER_STAGE (object);
ClutterStagePrivate *priv = stage->priv;
g_queue_foreach (priv->event_queue, (GFunc) clutter_event_free, NULL);
g_queue_free (priv->event_queue);
g_free (priv->title);
g_array_free (priv->paint_volume_stack, TRUE);
_clutter_stage_clear_pick_stack (stage);
g_array_free (priv->pick_clip_stack, TRUE);
g_array_free (priv->pick_stack, TRUE);
if (priv->fps_timer != NULL)
g_timer_destroy (priv->fps_timer);
if (priv->paint_notify != NULL)
priv->paint_notify (priv->paint_data);
G_OBJECT_CLASS (clutter_stage_parent_class)->finalize (object);
}
static void
clutter_stage_real_paint_view (ClutterStage *stage,
ClutterStageView *view,
const cairo_region_t *redraw_clip)
{
clutter_stage_do_paint_view (stage, view, redraw_clip);
}
static void
clutter_stage_class_init (ClutterStageClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
ClutterActorClass *actor_class = CLUTTER_ACTOR_CLASS (klass);
gobject_class->constructed = clutter_stage_constructed;
gobject_class->set_property = clutter_stage_set_property;
gobject_class->get_property = clutter_stage_get_property;
gobject_class->dispose = clutter_stage_dispose;
gobject_class->finalize = clutter_stage_finalize;
actor_class->allocate = clutter_stage_allocate;
actor_class->get_preferred_width = clutter_stage_get_preferred_width;
actor_class->get_preferred_height = clutter_stage_get_preferred_height;
actor_class->paint = clutter_stage_paint;
actor_class->pick = clutter_stage_pick;
actor_class->get_paint_volume = clutter_stage_get_paint_volume;
actor_class->realize = clutter_stage_realize;
actor_class->unrealize = clutter_stage_unrealize;
actor_class->show = clutter_stage_show;
actor_class->show_all = clutter_stage_show_all;
actor_class->hide = clutter_stage_hide;
actor_class->hide_all = clutter_stage_hide_all;
actor_class->queue_relayout = clutter_stage_real_queue_relayout;
actor_class->queue_redraw = clutter_stage_real_queue_redraw;
actor_class->apply_transform = clutter_stage_real_apply_transform;
klass->paint_view = clutter_stage_real_paint_view;
/**
* ClutterStage:cursor-visible:
*
* Whether the mouse pointer should be visible
*/
obj_props[PROP_CURSOR_VISIBLE] =
g_param_spec_boolean ("cursor-visible",
P_("Cursor Visible"),
P_("Whether the mouse pointer is visible on the main stage"),
TRUE,
CLUTTER_PARAM_READWRITE);
/**
* ClutterStage:color:
*
* The background color of the main stage.
*
* Deprecated: 1.10: Use the #ClutterActor:background-color property of
* #ClutterActor instead.
*/
obj_props[PROP_COLOR] =
clutter_param_spec_color ("color",
P_("Color"),
P_("The color of the stage"),
&default_stage_color,
CLUTTER_PARAM_READWRITE |
G_PARAM_DEPRECATED);
/**
* ClutterStage:perspective:
*
* The parameters used for the perspective projection from 3D
* coordinates to 2D
*
* Since: 0.8
*/
obj_props[PROP_PERSPECTIVE] =
g_param_spec_boxed ("perspective",
P_("Perspective"),
P_("Perspective projection parameters"),
CLUTTER_TYPE_PERSPECTIVE,
CLUTTER_PARAM_READWRITE);
/**
* ClutterStage:title:
*
* The stage's title - usually displayed in stage windows title decorations.
*
* Since: 0.4
*/
obj_props[PROP_TITLE] =
g_param_spec_string ("title",
P_("Title"),
P_("Stage Title"),
NULL,
CLUTTER_PARAM_READWRITE);
/**
* ClutterStage:use-alpha:
*
* Whether the #ClutterStage should honour the alpha component of the
* #ClutterStage:color property when painting. If Clutter is run under
* a compositing manager this will result in the stage being blended
* with the underlying window(s)
*
* Since: 1.2
*/
obj_props[PROP_USE_ALPHA] =
g_param_spec_boolean ("use-alpha",
P_("Use Alpha"),
P_("Whether to honour the alpha component of the stage color"),
FALSE,
CLUTTER_PARAM_READWRITE);
/**
* ClutterStage:key-focus:
*
* The #ClutterActor that will receive key events from the underlying
* windowing system.
*
* If %NULL, the #ClutterStage will receive the events.
*
* Since: 1.2
*/
obj_props[PROP_KEY_FOCUS] =
g_param_spec_object ("key-focus",
P_("Key Focus"),
P_("The currently key focused actor"),
CLUTTER_TYPE_ACTOR,
CLUTTER_PARAM_READWRITE);
/**
* ClutterStage:accept-focus:
*
* Whether the #ClutterStage should accept key focus when shown.
*
* Since: 1.6
*/
obj_props[PROP_ACCEPT_FOCUS] =
g_param_spec_boolean ("accept-focus",
P_("Accept Focus"),
P_("Whether the stage should accept focus on show"),
TRUE,
CLUTTER_PARAM_READWRITE);
g_object_class_install_properties (gobject_class, PROP_LAST, obj_props);
/**
* ClutterStage::activate:
* @stage: the stage which was activated
*
* The ::activate signal is emitted when the stage receives key focus
* from the underlying window system.
*
* Since: 0.6
*/
stage_signals[ACTIVATE] =
g_signal_new (I_("activate"),
G_TYPE_FROM_CLASS (gobject_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (ClutterStageClass, activate),
NULL, NULL, NULL,
G_TYPE_NONE, 0);
/**
* ClutterStage::deactivate:
* @stage: the stage which was deactivated
*
* The ::deactivate signal is emitted when the stage loses key focus
* from the underlying window system.
*
* Since: 0.6
*/
stage_signals[DEACTIVATE] =
g_signal_new (I_("deactivate"),
G_TYPE_FROM_CLASS (gobject_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (ClutterStageClass, deactivate),
NULL, NULL, NULL,
G_TYPE_NONE, 0);
/**
* ClutterStage::delete-event:
* @stage: the stage that received the event
* @event: a #ClutterEvent of type %CLUTTER_DELETE
*
* The ::delete-event signal is emitted when the user closes a
* #ClutterStage window using the window controls.
*
* Clutter by default will call clutter_main_quit() if @stage is
* the default stage, and clutter_actor_destroy() for any other
* stage.
*
* It is possible to override the default behaviour by connecting
* a new handler and returning %TRUE there.
*
* This signal is emitted only on Clutter backends that
* embed #ClutterStage in native windows. It is not emitted for
* backends that use a static frame buffer.
*
* Since: 1.2
*/
stage_signals[DELETE_EVENT] =
g_signal_new (I_("delete-event"),
G_TYPE_FROM_CLASS (gobject_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (ClutterStageClass, delete_event),
_clutter_boolean_handled_accumulator, NULL,
_clutter_marshal_BOOLEAN__BOXED,
G_TYPE_BOOLEAN, 1,
CLUTTER_TYPE_EVENT | G_SIGNAL_TYPE_STATIC_SCOPE);
/**
* ClutterStage::after-paint:
* @stage: the stage that received the event
* @paint_Context: the paint context
*
* The ::after-paint signal is emitted after the stage is painted,
* but before the results are displayed on the screen.
*
* Since: 1.20
*/
stage_signals[AFTER_PAINT] =
g_signal_new (I_("after-paint"),
G_TYPE_FROM_CLASS (gobject_class),
G_SIGNAL_RUN_LAST,
0, /* no corresponding vfunc */
NULL, NULL, NULL,
G_TYPE_NONE, 0);
/**
* ClutterStage::paint-view:
* @stage: the stage that received the event
* @view: a #ClutterStageView
* @redraw_clip: a #cairo_region_t with the redraw clip
*
* The ::paint-view signal is emitted before a #ClutterStageView is being
* painted.
*
* The view is painted in the default handler. Hence, if you want to perform
* some action after the view is painted, like reading the contents of the
* framebuffer, use g_signal_connect_after() or pass %G_CONNECT_AFTER.
*/
stage_signals[PAINT_VIEW] =
g_signal_new (I_("paint-view"),
G_TYPE_FROM_CLASS (gobject_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (ClutterStageClass, paint_view),
NULL, NULL, NULL,
G_TYPE_NONE, 2,
CLUTTER_TYPE_STAGE_VIEW,
G_TYPE_POINTER);
/**
* ClutterStage::presented: (skip)
* @stage: the stage that received the event
* @frame_event: a #CoglFrameEvent
* @frame_info: a #ClutterFrameInfo
*
* Signals that the #ClutterStage was presented on the screen to the user.
*/
stage_signals[PRESENTED] =
g_signal_new (I_("presented"),
G_TYPE_FROM_CLASS (gobject_class),
G_SIGNAL_RUN_LAST,
0, NULL, NULL,
_clutter_marshal_VOID__INT_POINTER,
G_TYPE_NONE, 2,
G_TYPE_INT, G_TYPE_POINTER);
klass->activate = clutter_stage_real_activate;
klass->deactivate = clutter_stage_real_deactivate;
klass->delete_event = clutter_stage_real_delete_event;
}
static void
clutter_stage_notify_min_size (ClutterStage *self)
{
self->priv->min_size_changed = TRUE;
}
static void
clutter_stage_init (ClutterStage *self)
{
cairo_rectangle_int_t geom = { 0, };
ClutterStagePrivate *priv;
ClutterStageWindow *impl;
ClutterBackend *backend;
GError *error;
/* a stage is a top-level object */
CLUTTER_SET_PRIVATE_FLAGS (self, CLUTTER_IS_TOPLEVEL);
self->priv = priv = clutter_stage_get_instance_private (self);
CLUTTER_NOTE (BACKEND, "Creating stage from the default backend");
backend = clutter_get_default_backend ();
error = NULL;
impl = _clutter_backend_create_stage (backend, self, &error);
if (G_LIKELY (impl != NULL))
{
_clutter_stage_set_window (self, impl);
_clutter_stage_window_get_geometry (priv->impl, &geom);
}
else
{
if (error != NULL)
{
g_critical ("Unable to create a new stage implementation: %s",
error->message);
g_error_free (error);
}
else
g_critical ("Unable to create a new stage implementation.");
}
priv->event_queue = g_queue_new ();
priv->is_cursor_visible = TRUE;
priv->throttle_motion_events = TRUE;
priv->min_size_changed = FALSE;
priv->sync_delay = -1;
priv->motion_events_enabled = TRUE;
clutter_actor_set_background_color (CLUTTER_ACTOR (self),
&default_stage_color);
priv->pending_relayouts = g_hash_table_new_full (NULL,
NULL,
g_object_unref,
NULL);
clutter_stage_queue_actor_relayout (self, CLUTTER_ACTOR (self));
clutter_actor_set_reactive (CLUTTER_ACTOR (self), TRUE);
clutter_stage_set_title (self, g_get_prgname ());
clutter_stage_set_key_focus (self, NULL);
g_signal_connect (self, "notify::min-width",
G_CALLBACK (clutter_stage_notify_min_size), NULL);
g_signal_connect (self, "notify::min-height",
G_CALLBACK (clutter_stage_notify_min_size), NULL);
_clutter_stage_set_viewport (self,
0, 0,
geom.width,
geom.height);
priv->paint_volume_stack =
g_array_new (FALSE, FALSE, sizeof (ClutterPaintVolume));
priv->pick_stack = g_array_new (FALSE, FALSE, sizeof (PickRecord));
priv->pick_clip_stack = g_array_new (FALSE, FALSE, sizeof (PickClipRecord));
priv->pick_clip_stack_top = -1;
priv->cached_pick_mode = CLUTTER_PICK_NONE;
}
/**
* clutter_stage_get_default:
*
* Retrieves a #ClutterStage singleton.
*
* This function is not as useful as it sounds, and will most likely
* by deprecated in the future. Application code should only create
* a #ClutterStage instance using clutter_stage_new(), and manage the
* lifetime of the stage manually.
*
* The default stage singleton has a platform-specific behaviour: on
* platforms without the %CLUTTER_FEATURE_STAGE_MULTIPLE feature flag
* set, the first #ClutterStage instance will also be set to be the
* default stage instance, and this function will always return a
* pointer to it.
*
* On platforms with the %CLUTTER_FEATURE_STAGE_MULTIPLE feature flag
* set, the default stage will be created by the first call to this
* function, and every following call will return the same pointer to
* it.
*
* Return value: (transfer none) (type Clutter.Stage): the main
* #ClutterStage. You should never destroy or unref the returned
* actor.
*
* Deprecated: 1.10: Use clutter_stage_new() instead.
*/
ClutterActor *
clutter_stage_get_default (void)
{
ClutterStageManager *stage_manager = clutter_stage_manager_get_default ();
ClutterStage *stage;
stage = clutter_stage_manager_get_default_stage (stage_manager);
if (G_UNLIKELY (stage == NULL))
{
/* This will take care of automatically adding the stage to the
* stage manager and setting it as the default. Its floating
* reference will be claimed by the stage manager.
*/
stage = g_object_new (CLUTTER_TYPE_STAGE, NULL);
_clutter_stage_manager_set_default_stage (stage_manager, stage);
/* the default stage is realized by default */
clutter_actor_realize (CLUTTER_ACTOR (stage));
}
return CLUTTER_ACTOR (stage);
}
/**
* clutter_stage_set_color:
* @stage: A #ClutterStage
* @color: A #ClutterColor
*
* Sets the stage color.
*
* Deprecated: 1.10: Use clutter_actor_set_background_color() instead.
*/
void
clutter_stage_set_color (ClutterStage *stage,
const ClutterColor *color)
{
clutter_actor_set_background_color (CLUTTER_ACTOR (stage), color);
g_object_notify_by_pspec (G_OBJECT (stage), obj_props[PROP_COLOR]);
}
/**
* clutter_stage_get_color:
* @stage: A #ClutterStage
* @color: (out caller-allocates): return location for a #ClutterColor
*
* Retrieves the stage color.
*
* Deprecated: 1.10: Use clutter_actor_get_background_color() instead.
*/
void
clutter_stage_get_color (ClutterStage *stage,
ClutterColor *color)
{
clutter_actor_get_background_color (CLUTTER_ACTOR (stage), color);
}
static void
clutter_stage_set_perspective_internal (ClutterStage *stage,
ClutterPerspective *perspective)
{
ClutterStagePrivate *priv = stage->priv;
if (priv->perspective.fovy == perspective->fovy &&
priv->perspective.aspect == perspective->aspect &&
priv->perspective.z_near == perspective->z_near &&
priv->perspective.z_far == perspective->z_far)
return;
priv->perspective = *perspective;
cogl_matrix_init_identity (&priv->projection);
cogl_matrix_perspective (&priv->projection,
priv->perspective.fovy,
priv->perspective.aspect,
priv->perspective.z_near,
priv->perspective.z_far);
cogl_matrix_get_inverse (&priv->projection,
&priv->inverse_projection);
_clutter_stage_dirty_projection (stage);
clutter_actor_queue_redraw (CLUTTER_ACTOR (stage));
}
/**
* clutter_stage_set_perspective:
* @stage: A #ClutterStage
* @perspective: A #ClutterPerspective
*
* Sets the stage perspective. Using this function is not recommended
* because it will disable Clutter's attempts to generate an
* appropriate perspective based on the size of the stage.
*/
void
clutter_stage_set_perspective (ClutterStage *stage,
ClutterPerspective *perspective)
{
ClutterStagePrivate *priv;
g_return_if_fail (CLUTTER_IS_STAGE (stage));
g_return_if_fail (perspective != NULL);
g_return_if_fail (perspective->z_far - perspective->z_near != 0);
priv = stage->priv;
/* If the application ever calls this function then we'll stop
automatically updating the perspective when the stage changes
size */
priv->has_custom_perspective = TRUE;
clutter_stage_set_perspective_internal (stage, perspective);
clutter_stage_update_view_perspective (stage);
}
/**
* clutter_stage_get_perspective:
* @stage: A #ClutterStage
* @perspective: (out caller-allocates) (allow-none): return location for a
* #ClutterPerspective
*
* Retrieves the stage perspective.
*/
void
clutter_stage_get_perspective (ClutterStage *stage,
ClutterPerspective *perspective)
{
g_return_if_fail (CLUTTER_IS_STAGE (stage));
g_return_if_fail (perspective != NULL);
*perspective = stage->priv->perspective;
}
/*
* clutter_stage_get_projection_matrix:
* @stage: A #ClutterStage
* @projection: return location for a #CoglMatrix representing the
* perspective projection applied to actors on the given
* @stage.
*
* Retrieves the @stage's projection matrix. This is derived from the
* current perspective set using clutter_stage_set_perspective().
*
* Since: 1.6
*/
void
_clutter_stage_get_projection_matrix (ClutterStage *stage,
CoglMatrix *projection)
{
g_return_if_fail (CLUTTER_IS_STAGE (stage));
g_return_if_fail (projection != NULL);
*projection = stage->priv->projection;
}
/* This simply provides a simple mechanism for us to ensure that
* the projection matrix gets re-asserted before painting.
*
* This is used when switching between multiple stages */
void
_clutter_stage_dirty_projection (ClutterStage *stage)
{
ClutterStagePrivate *priv;
GList *l;
g_return_if_fail (CLUTTER_IS_STAGE (stage));
priv = stage->priv;
for (l = _clutter_stage_window_get_views (priv->impl); l; l = l->next)
{
ClutterStageView *view = l->data;
clutter_stage_view_set_dirty_projection (view, TRUE);
}
}
/*
* clutter_stage_set_viewport:
* @stage: A #ClutterStage
* @x: The X postition to render the stage at, in window coordinates
* @y: The Y position to render the stage at, in window coordinates
* @width: The width to render the stage at, in window coordinates
* @height: The height to render the stage at, in window coordinates
*
* Sets the stage viewport. The viewport defines a final scale and
* translation of your rendered stage and actors. This lets you render
* your stage into a subregion of the stage window or you could use it to
* pan a subregion of the stage if your stage window is smaller then
* the stage. (XXX: currently this isn't possible)
*
* Unlike a scale and translation done using the modelview matrix this
* is done after everything has had perspective projection applied, so
* for example if you were to pan across a subregion of the stage using
* the viewport then you would not see a change in perspective for the
* actors on the stage.
*
* Normally the stage viewport will automatically track the size of the
* stage window with no offset so the stage will fill your window. This
* behaviour can be changed with the "viewport-mimics-window" property
* which will automatically be set to FALSE if you use this API. If
* you want to revert to the original behaviour then you should set
* this property back to %TRUE using
* clutter_stage_set_viewport_mimics_window().
* (XXX: If we were to make this API public then we might want to do
* add that property.)
*
* Note: currently this interface only support integer precision
* offsets and sizes for viewports but the interface takes floats because
* OpenGL 4.0 has introduced floating point viewports which we might
* want to expose via this API eventually.
*
* Since: 1.6
*/
void
_clutter_stage_set_viewport (ClutterStage *stage,
float x,
float y,
float width,
float height)
{
ClutterStagePrivate *priv;
g_return_if_fail (CLUTTER_IS_STAGE (stage));
priv = stage->priv;
if (x == priv->viewport[0] &&
y == priv->viewport[1] &&
width == priv->viewport[2] &&
height == priv->viewport[3])
return;
priv->viewport[0] = x;
priv->viewport[1] = y;
priv->viewport[2] = width;
priv->viewport[3] = height;
clutter_stage_update_view_perspective (stage);
_clutter_stage_dirty_viewport (stage);
queue_full_redraw (stage);
}
/* This simply provides a simple mechanism for us to ensure that
* the viewport gets re-asserted before next painting.
*
* This is used when switching between multiple stages */
void
_clutter_stage_dirty_viewport (ClutterStage *stage)
{
ClutterStagePrivate *priv;
GList *l;
g_return_if_fail (CLUTTER_IS_STAGE (stage));
priv = stage->priv;
for (l = _clutter_stage_window_get_views (priv->impl); l; l = l->next)
{
ClutterStageView *view = l->data;
clutter_stage_view_set_dirty_viewport (view, TRUE);
}
}
/*
* clutter_stage_get_viewport:
* @stage: A #ClutterStage
* @x: A location for the X position where the stage is rendered,
* in window coordinates.
* @y: A location for the Y position where the stage is rendered,
* in window coordinates.
* @width: A location for the width the stage is rendered at,
* in window coordinates.
* @height: A location for the height the stage is rendered at,
* in window coordinates.
*
* Returns the viewport offset and size set using
* clutter_stage_set_viewport() or if the "viewport-mimics-window" property
* is TRUE then @x and @y will be set to 0 and @width and @height will equal
* the width if the stage window.
*
* Since: 1.6
*/
void
_clutter_stage_get_viewport (ClutterStage *stage,
float *x,
float *y,
float *width,
float *height)
{
ClutterStagePrivate *priv;
g_return_if_fail (CLUTTER_IS_STAGE (stage));
priv = stage->priv;
*x = priv->viewport[0];
*y = priv->viewport[1];
*width = priv->viewport[2];
*height = priv->viewport[3];
}
/**
* 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)
{
ClutterStageWindow *impl = CLUTTER_STAGE_WINDOW (priv->impl);
ClutterStageWindowInterface *iface;
iface = CLUTTER_STAGE_WINDOW_GET_IFACE (impl);
if (iface->set_cursor_visible)
{
priv->is_cursor_visible = TRUE;
iface->set_cursor_visible (impl, TRUE);
g_object_notify_by_pspec (G_OBJECT (stage),
obj_props[PROP_CURSOR_VISIBLE]);
}
}
}
/**
* clutter_stage_hide_cursor:
* @stage: a #ClutterStage
*
* Makes the cursor invisible on the stage window
*
* Since: 0.4
*/
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)
{
ClutterStageWindow *impl = CLUTTER_STAGE_WINDOW (priv->impl);
ClutterStageWindowInterface *iface;
iface = CLUTTER_STAGE_WINDOW_GET_IFACE (impl);
if (iface->set_cursor_visible)
{
priv->is_cursor_visible = FALSE;
iface->set_cursor_visible (impl, FALSE);
g_object_notify_by_pspec (G_OBJECT (stage),
obj_props[PROP_CURSOR_VISIBLE]);
}
}
}
/**
* clutter_stage_read_pixels:
* @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
*
* Makes a screenshot of the stage in RGBA 8bit data, returns a
* linear buffer with @width * 4 as rowstride.
*
* The alpha data contained in the returned buffer is driver-dependent,
* and not guaranteed to hold any sensible value.
*
* Return value: (transfer full) (array): a pointer to newly allocated memory with the buffer
* or %NULL if the read failed. Use g_free() on the returned data
* to release the resources it has allocated.
*/
guchar *
clutter_stage_read_pixels (ClutterStage *stage,
gint x,
gint y,
gint width,
gint height)
{
ClutterStagePrivate *priv;
ClutterActorBox box;
GList *l;
ClutterStageView *view;
cairo_region_t *clip;
cairo_rectangle_int_t clip_rect;
CoglFramebuffer *framebuffer;
float view_scale;
float pixel_width;
float pixel_height;
uint8_t *pixels;
COGL_TRACE_BEGIN_SCOPED (ClutterStageReadPixels, "Read Pixels");
g_return_val_if_fail (CLUTTER_IS_STAGE (stage), NULL);
priv = stage->priv;
clutter_actor_get_allocation_box (CLUTTER_ACTOR (stage), &box);
if (width < 0)
width = ceilf (box.x2 - box.x1);
if (height < 0)
height = ceilf (box.y2 - box.y1);
l = _clutter_stage_window_get_views (priv->impl);
if (!l)
return NULL;
/* XXX: We only read the first view. Needs different API for multi view screen
* capture. */
view = l->data;
clutter_stage_view_get_layout (view, &clip_rect);
clip = cairo_region_create_rectangle (&clip_rect);
cairo_region_intersect_rectangle (clip,
&(cairo_rectangle_int_t) {
.x = x,
.y = y,
.width = width,
.height = height,
});
cairo_region_get_extents (clip, &clip_rect);
if (clip_rect.width == 0 || clip_rect.height == 0)
{
cairo_region_destroy (clip);
return NULL;
}
framebuffer = clutter_stage_view_get_framebuffer (view);
clutter_stage_do_paint_view (stage, view, clip);
cairo_region_destroy (clip);
view_scale = clutter_stage_view_get_scale (view);
pixel_width = roundf (clip_rect.width * view_scale);
pixel_height = roundf (clip_rect.height * view_scale);
pixels = g_malloc0 (pixel_width * pixel_height * 4);
cogl_framebuffer_read_pixels (framebuffer,
clip_rect.x * view_scale,
clip_rect.y * view_scale,
pixel_width, pixel_height,
COGL_PIXEL_FORMAT_RGBA_8888,
pixels);
return pixels;
}
/**
* clutter_stage_get_actor_at_pos:
* @stage: a #ClutterStage
* @pick_mode: how the scene graph should be painted
* @x: X coordinate to check
* @y: Y coordinate to check
*
* Checks the scene at the coordinates @x and @y and returns a pointer
* to the #ClutterActor at those coordinates. The result is the actor which
* would be at the specified location on the next redraw, and is not
* necessarily that which was there on the previous redraw. This allows the
* function to perform chronologically correctly after any queued changes to
* the scene, and even if nothing has been drawn.
*
* By using @pick_mode it is possible to control which actors will be
* painted and thus available.
*
* Return value: (transfer none): the actor at the specified coordinates,
* if any
*/
ClutterActor *
clutter_stage_get_actor_at_pos (ClutterStage *stage,
ClutterPickMode pick_mode,
float x,
float y)
{
g_return_val_if_fail (CLUTTER_IS_STAGE (stage), NULL);
return _clutter_stage_do_pick (stage, x, y, pick_mode);
}
/**
* clutter_stage_event:
* @stage: a #ClutterStage
* @event: a #ClutterEvent
*
* This function is used to emit an event on the main stage.
*
* You should rarely need to use this function, except for
* synthetised events.
*
* Return value: the return value from the signal emission
*
* Since: 0.4
*/
gboolean
clutter_stage_event (ClutterStage *stage,
ClutterEvent *event)
{
g_return_val_if_fail (CLUTTER_IS_STAGE (stage), FALSE);
g_return_val_if_fail (event != NULL, FALSE);
if (event->type == CLUTTER_DELETE)
{
gboolean retval = FALSE;
g_signal_emit_by_name (stage, "event", event, &retval);
if (!retval)
g_signal_emit_by_name (stage, "delete-event", event, &retval);
return retval;
}
if (event->type != CLUTTER_STAGE_STATE)
return FALSE;
/* emit raw event */
if (clutter_actor_event (CLUTTER_ACTOR (stage), event, FALSE))
return TRUE;
if (event->stage_state.changed_mask & CLUTTER_STAGE_STATE_ACTIVATED)
{
if (event->stage_state.new_state & CLUTTER_STAGE_STATE_ACTIVATED)
g_signal_emit (stage, stage_signals[ACTIVATE], 0);
else
g_signal_emit (stage, stage_signals[DEACTIVATE], 0);
}
return TRUE;
}
/**
* clutter_stage_set_title:
* @stage: A #ClutterStage
* @title: A utf8 string for the stage windows title.
*
* Sets the stage title.
*
* Since: 0.4
**/
void
clutter_stage_set_title (ClutterStage *stage,
const gchar *title)
{
ClutterStagePrivate *priv;
ClutterStageWindow *impl;
g_return_if_fail (CLUTTER_IS_STAGE (stage));
priv = stage->priv;
g_free (priv->title);
priv->title = g_strdup (title);
impl = CLUTTER_STAGE_WINDOW (priv->impl);
if (CLUTTER_STAGE_WINDOW_GET_IFACE(impl)->set_title != NULL)
CLUTTER_STAGE_WINDOW_GET_IFACE (impl)->set_title (impl, priv->title);
g_object_notify_by_pspec (G_OBJECT (stage), obj_props[PROP_TITLE]);
}
/**
* clutter_stage_get_title:
* @stage: A #ClutterStage
*
* Gets the stage title.
*
* Return value: pointer to the title string for the stage. The
* returned string is owned by the actor and should not
* be modified or freed.
*
* Since: 0.4
**/
const gchar *
clutter_stage_get_title (ClutterStage *stage)
{
g_return_val_if_fail (CLUTTER_IS_STAGE (stage), NULL);
return stage->priv->title;
}
/**
* clutter_stage_set_key_focus:
* @stage: the #ClutterStage
* @actor: (allow-none): the actor to set key focus to, or %NULL
*
* Sets the key focus on @actor. An actor with key focus will receive
* all the key events. If @actor is %NULL, the stage will receive
* focus.
*
* Since: 0.6
*/
void
clutter_stage_set_key_focus (ClutterStage *stage,
ClutterActor *actor)
{
ClutterStagePrivate *priv;
g_return_if_fail (CLUTTER_IS_STAGE (stage));
g_return_if_fail (actor == NULL || CLUTTER_IS_ACTOR (actor));
priv = stage->priv;
/* normalize the key focus. NULL == stage */
if (actor == CLUTTER_ACTOR (stage))
actor = NULL;
/* avoid emitting signals and notifications if we're setting the same
* actor as the key focus
*/
if (priv->key_focused_actor == actor)
return;
if (priv->key_focused_actor != NULL)
{
ClutterActor *old_focused_actor;
old_focused_actor = priv->key_focused_actor;
/* set key_focused_actor to NULL before emitting the signal or someone
* might hide the previously focused actor in the signal handler
*/
priv->key_focused_actor = NULL;
_clutter_actor_set_has_key_focus (old_focused_actor, FALSE);
}
else
_clutter_actor_set_has_key_focus (CLUTTER_ACTOR (stage), FALSE);
/* Note, if someone changes key focus in focus-out signal handler we'd be
* overriding the latter call below moving the focus where it was originally
* intended. The order of events would be:
* 1st focus-out, 2nd focus-out (on stage), 2nd focus-in, 1st focus-in
*/
if (actor != NULL)
{
priv->key_focused_actor = actor;
_clutter_actor_set_has_key_focus (actor, TRUE);
}
else
_clutter_actor_set_has_key_focus (CLUTTER_ACTOR (stage), TRUE);
g_object_notify_by_pspec (G_OBJECT (stage), obj_props[PROP_KEY_FOCUS]);
}
/**
* clutter_stage_get_key_focus:
* @stage: the #ClutterStage
*
* Retrieves the actor that is currently under key focus.
*
* Return value: (transfer none): the actor with key focus, or the stage
*
* Since: 0.6
*/
ClutterActor *
clutter_stage_get_key_focus (ClutterStage *stage)
{
g_return_val_if_fail (CLUTTER_IS_STAGE (stage), NULL);
if (stage->priv->key_focused_actor)
return stage->priv->key_focused_actor;
return CLUTTER_ACTOR (stage);
}
/*** Perspective boxed type ******/
static gpointer
clutter_perspective_copy (gpointer data)
{
if (G_LIKELY (data))
return g_slice_dup (ClutterPerspective, data);
return NULL;
}
static void
clutter_perspective_free (gpointer data)
{
if (G_LIKELY (data))
g_slice_free (ClutterPerspective, data);
}
G_DEFINE_BOXED_TYPE (ClutterPerspective, clutter_perspective,
clutter_perspective_copy,
clutter_perspective_free);
/**
* clutter_stage_new:
*
* Creates a new, non-default stage. A non-default stage is a new
* top-level actor which can be used as another container. It works
* exactly like the default stage, but while clutter_stage_get_default()
* will always return the same instance, you will have to keep a pointer
* to any #ClutterStage returned by clutter_stage_new().
*
* The ability to support multiple stages depends on the current
* backend. Use clutter_feature_available() and
* %CLUTTER_FEATURE_STAGE_MULTIPLE to check at runtime whether a
* backend supports multiple stages.
*
* Return value: a new stage, or %NULL if the default backend does
* not support multiple stages. Use clutter_actor_destroy() to
* programmatically close the returned stage.
*
* Since: 0.8
*/
ClutterActor *
clutter_stage_new (void)
{
return g_object_new (CLUTTER_TYPE_STAGE, NULL);
}
/**
* clutter_stage_ensure_current:
* @stage: the #ClutterStage
*
* This function essentially makes sure the right GL context is
* current for the passed stage. It is not intended to
* be used by applications.
*
* Since: 0.8
* Deprecated: mutter: This function does not do anything.
*/
void
clutter_stage_ensure_current (ClutterStage *stage)
{
g_return_if_fail (CLUTTER_IS_STAGE (stage));
}
/**
* clutter_stage_ensure_viewport:
* @stage: a #ClutterStage
*
* Ensures that the GL viewport is updated with the current
* stage window size.
*
* This function will queue a redraw of @stage.
*
* This function should not be called by applications; it is used
* when embedding a #ClutterStage into a toolkit with another
* windowing system, like GTK+.
*
* Since: 1.0
*/
void
clutter_stage_ensure_viewport (ClutterStage *stage)
{
g_return_if_fail (CLUTTER_IS_STAGE (stage));
_clutter_stage_dirty_viewport (stage);
clutter_actor_queue_redraw (CLUTTER_ACTOR (stage));
}
# define _DEG_TO_RAD(d) ((d) * ((float) G_PI / 180.0f))
/* This calculates a distance into the view frustum to position the
* stage so there is a decent amount of space to position geometry
* between the stage and the near clipping plane.
*
* Some awkward issues with this problem are:
* - It's not possible to have a gap as large as the stage size with
* a fov > 53° which is basically always the case since the default
* fov is 60°.
* - This can be deduced if you consider that this requires a
* triangle as wide as it is deep to fit in the frustum in front
* of the z_near plane. That triangle will always have an angle
* of 53.13° at the point sitting on the z_near plane, but if the
* frustum has a wider fov angle the left/right clipping planes
* can never converge with the two corners of our triangle no
* matter what size the triangle has.
* - With a fov > 53° there is a trade off between maximizing the gap
* size relative to the stage size but not loosing depth precision.
* - Perhaps ideally we wouldn't just consider the fov on the y-axis
* that is usually used to define a perspective, we would consider
* the fov of the axis with the largest stage size so the gap would
* accommodate that size best.
*
* After going around in circles a few times with how to handle these
* issues, we decided in the end to go for the simplest solution to
* start with instead of an elaborate function that handles arbitrary
* fov angles that we currently have no use-case for.
*
* The solution assumes a fovy of 60° and for that case gives a gap
* that's 85% of the stage height. We can consider more elaborate
* functions if necessary later.
*
* One guide we had to steer the gap size we support is the
* interactive test, test-texture-quality which expects to animate an
* actor to +400 on the z axis with a stage size of 640x480. A gap
* that's 85% of the stage height gives a gap of 408 in that case.
*/
static float
calculate_z_translation (float z_near)
{
/* This solution uses fairly basic trigonometry, but is seems worth
* clarifying the particular geometry we are looking at in-case
* anyone wants to develop this further later. Not sure how well an
* ascii diagram is going to work :-)
*
* |--- stage_height ---|
* | stage line |
* ╲━━━━━━━━━━━━━━━━━━━━━╱------------
* ╲. (2) │ .╱ | |
* C ╲ . │ . ╱ gap| |
* =0.5°╲ . a │ . ╱ | |
* b╲(1). D│ . ╱ | |
* ╲ B.│. ╱near plane | |
* A= ╲━━━━━━━━━╱------------- |
* 120° ╲ c │ ╱ | z_2d
* ╲ │ ╱ z_near |
* left ╲ │ ╱ | |
* clip 60°fovy | |
* plane ╳----------------------
* |
* |
* origin line
*
* The area of interest is the triangle labeled (1) at the top left
* marked with the ... line (a) from where the origin line crosses
* the near plane to the top left where the stage line cross the
* left clip plane.
*
* The sides of the triangle are a, b and c and the corresponding
* angles opposite those sides are A, B and C.
*
* The angle of C is what trades off the gap size we have relative
* to the stage size vs the depth precision we have.
*
* As mentioned above we arove at the angle for C is by working
* backwards from how much space we want for test-texture-quality.
* With a stage_height of 480 we want a gap > 400, ideally we also
* wanted a somewhat round number as a percentage of the height for
* documentation purposes. ~87% or a gap of ~416 is the limit
* because that's where we approach a C angle of 0° and effectively
* loose all depth precision.
*
* So for our test app with a stage_height of 480 if we aim for a
* gap of 408 (85% of 480) we can get the angle D as
* atan (stage_height/2/408) = 30.5°.
*
* That gives us the angle for B as 90° - 30.5° = 59.5°
*
* We can already determine that A has an angle of (fovy/2 + 90°) =
* 120°
*
* Therefore C = 180 - A - B = 0.5°
*
* The length of c = z_near * tan (30°)
*
* Now we can use the rule a/SinA = c/SinC to calculate the
* length of a. After some rearranging that gives us:
*
* a c
* ---------- = ----------
* sin (120°) sin (0.5°)
*
* c * sin (120°)
* a = --------------
* sin (0.5°)
*
* And with that we can determine z_2d = cos (D) * a =
* cos (30.5°) * a + z_near:
*
* c * sin (120°) * cos (30.5°)
* z_2d = --------------------------- + z_near
* sin (0.5°)
*/
/* We expect the compiler should boil this down to z_near * CONSTANT
* already, but just in case we use precomputed constants
*/
#if 0
# define A tanf (_DEG_TO_RAD (30.f))
# define B sinf (_DEG_TO_RAD (120.f))
# define C cosf (_DEG_TO_RAD (30.5f))
# define D sinf (_DEG_TO_RAD (.5f))
#else
# define A 0.57735025882720947265625f
# define B 0.866025388240814208984375f
# define C 0.86162912845611572265625f
# define D 0.00872653536498546600341796875f
#endif
return z_near
* A * B * C
/ D
+ z_near;
}
static void
clutter_stage_update_view_perspective (ClutterStage *stage)
{
ClutterStagePrivate *priv = stage->priv;
ClutterPerspective perspective;
float z_2d;
perspective = priv->perspective;
/* Ideally we want to regenerate the perspective matrix whenever
* the size changes but if the user has provided a custom matrix
* then we don't want to override it */
if (!priv->has_custom_perspective)
{
perspective.fovy = 60.0; /* 60 Degrees */
perspective.z_near = 0.1;
perspective.aspect = priv->viewport[2] / priv->viewport[3];
z_2d = calculate_z_translation (perspective.z_near);
/* NB: z_2d is only enough room for 85% of the stage_height between
* the stage and the z_near plane. For behind the stage plane we
* want a more consistent gap of 10 times the stage_height before
* hitting the far plane so we calculate that relative to the final
* height of the stage plane at the z_2d_distance we got... */
perspective.z_far = z_2d +
tanf (_DEG_TO_RAD (perspective.fovy / 2.0f)) * z_2d * 20.0f;
clutter_stage_set_perspective_internal (stage, &perspective);
}
else
{
z_2d = calculate_z_translation (perspective.z_near);
}
cogl_matrix_init_identity (&priv->view);
cogl_matrix_view_2d_in_perspective (&priv->view,
perspective.fovy,
perspective.aspect,
perspective.z_near,
z_2d,
priv->viewport[2],
priv->viewport[3]);
}
void
_clutter_stage_maybe_setup_viewport (ClutterStage *stage,
ClutterStageView *view)
{
ClutterStagePrivate *priv = stage->priv;
CoglFramebuffer *fb = clutter_stage_view_get_framebuffer (view);
if (clutter_stage_view_is_dirty_viewport (view))
{
cairo_rectangle_int_t view_layout;
float fb_scale;
float viewport_offset_x;
float viewport_offset_y;
float viewport_x;
float viewport_y;
float viewport_width;
float viewport_height;
CLUTTER_NOTE (PAINT,
"Setting up the viewport { w:%f, h:%f }",
priv->viewport[2],
priv->viewport[3]);
fb_scale = clutter_stage_view_get_scale (view);
clutter_stage_view_get_layout (view, &view_layout);
viewport_offset_x = view_layout.x * fb_scale;
viewport_offset_y = view_layout.y * fb_scale;
viewport_x = roundf (priv->viewport[0] * fb_scale - viewport_offset_x);
viewport_y = roundf (priv->viewport[1] * fb_scale - viewport_offset_y);
viewport_width = roundf (priv->viewport[2] * fb_scale);
viewport_height = roundf (priv->viewport[3] * fb_scale);
cogl_framebuffer_set_viewport (fb,
viewport_x, viewport_y,
viewport_width, viewport_height);
clutter_stage_view_set_dirty_viewport (view, FALSE);
}
if (clutter_stage_view_is_dirty_projection (view))
{
cogl_framebuffer_set_projection_matrix (fb, &priv->projection);
clutter_stage_view_set_dirty_projection (view, FALSE);
}
}
#undef _DEG_TO_RAD
/**
* clutter_stage_ensure_redraw:
* @stage: a #ClutterStage
*
* Ensures that @stage is redrawn
*
* This function should not be called by applications: it is
* used when embedding a #ClutterStage into a toolkit with
* another windowing system, like GTK+.
*
* Since: 1.0
*/
void
clutter_stage_ensure_redraw (ClutterStage *stage)
{
ClutterMasterClock *master_clock;
ClutterStagePrivate *priv;
g_return_if_fail (CLUTTER_IS_STAGE (stage));
priv = stage->priv;
if (!_clutter_stage_needs_update (stage))
_clutter_stage_schedule_update (stage);
priv->redraw_pending = TRUE;
master_clock = _clutter_master_clock_get_default ();
_clutter_master_clock_start_running (master_clock);
}
/**
* clutter_stage_is_redraw_queued: (skip)
*/
gboolean
clutter_stage_is_redraw_queued (ClutterStage *stage)
{
ClutterStagePrivate *priv = stage->priv;
return priv->redraw_pending;
}
/**
* clutter_stage_queue_redraw:
* @stage: the #ClutterStage
*
* Queues a redraw for the passed stage.
*
* Applications should call clutter_actor_queue_redraw() and not
* this function.
*
* Since: 0.8
*
* Deprecated: 1.10: Use clutter_actor_queue_redraw() instead.
*/
void
clutter_stage_queue_redraw (ClutterStage *stage)
{
g_return_if_fail (CLUTTER_IS_STAGE (stage));
clutter_actor_queue_redraw (CLUTTER_ACTOR (stage));
}
/**
* clutter_stage_is_default:
* @stage: a #ClutterStage
*
* Checks if @stage is the default stage, or an instance created using
* clutter_stage_new() but internally using the same implementation.
*
* Return value: %TRUE if the passed stage is the default one
*
* Since: 0.8
*
* Deprecated: 1.10: Track the stage pointer inside your application
* code, or use clutter_actor_get_stage() to retrieve the stage for
* a given actor.
*/
gboolean
clutter_stage_is_default (ClutterStage *stage)
{
g_return_val_if_fail (CLUTTER_IS_STAGE (stage), FALSE);
return stage_is_default (stage);
}
void
_clutter_stage_set_window (ClutterStage *stage,
ClutterStageWindow *stage_window)
{
g_return_if_fail (CLUTTER_IS_STAGE (stage));
g_return_if_fail (CLUTTER_IS_STAGE_WINDOW (stage_window));
if (stage->priv->impl != NULL)
g_object_unref (stage->priv->impl);
stage->priv->impl = stage_window;
}
ClutterStageWindow *
_clutter_stage_get_window (ClutterStage *stage)
{
g_return_val_if_fail (CLUTTER_IS_STAGE (stage), NULL);
return CLUTTER_STAGE_WINDOW (stage->priv->impl);
}
ClutterStageWindow *
_clutter_stage_get_default_window (void)
{
ClutterStageManager *manager = clutter_stage_manager_get_default ();
ClutterStage *stage;
stage = clutter_stage_manager_get_default_stage (manager);
if (stage == NULL)
return NULL;
return _clutter_stage_get_window (stage);
}
/**
* clutter_stage_set_throttle_motion_events:
* @stage: a #ClutterStage
* @throttle: %TRUE to throttle motion events
*
* Sets whether motion events received between redraws should
* be throttled or not. If motion events are throttled, those
* events received by the windowing system between redraws will
* be compressed so that only the last event will be propagated
* to the @stage and its actors.
*
* This function should only be used if you want to have all
* the motion events delivered to your application code.
*
* Since: 1.0
*/
void
clutter_stage_set_throttle_motion_events (ClutterStage *stage,
gboolean throttle)
{
ClutterStagePrivate *priv;
g_return_if_fail (CLUTTER_IS_STAGE (stage));
priv = stage->priv;
if (priv->throttle_motion_events != throttle)
priv->throttle_motion_events = throttle;
}
/**
* clutter_stage_get_throttle_motion_events:
* @stage: a #ClutterStage
*
* Retrieves the value set with clutter_stage_set_throttle_motion_events()
*
* Return value: %TRUE if the motion events are being throttled,
* and %FALSE otherwise
*
* Since: 1.0
*/
gboolean
clutter_stage_get_throttle_motion_events (ClutterStage *stage)
{
g_return_val_if_fail (CLUTTER_IS_STAGE (stage), FALSE);
return stage->priv->throttle_motion_events;
}
/**
* clutter_stage_set_use_alpha:
* @stage: a #ClutterStage
* @use_alpha: whether the stage should honour the opacity or the
* alpha channel of the stage color
*
* Sets whether the @stage should honour the #ClutterActor:opacity and
* the alpha channel of the #ClutterStage:color
*
* Since: 1.2
*/
void
clutter_stage_set_use_alpha (ClutterStage *stage,
gboolean use_alpha)
{
ClutterStagePrivate *priv;
g_return_if_fail (CLUTTER_IS_STAGE (stage));
priv = stage->priv;
if (priv->use_alpha != use_alpha)
{
priv->use_alpha = use_alpha;
clutter_actor_queue_redraw (CLUTTER_ACTOR (stage));
g_object_notify_by_pspec (G_OBJECT (stage), obj_props[PROP_USE_ALPHA]);
}
}
/**
* clutter_stage_get_use_alpha:
* @stage: a #ClutterStage
*
* Retrieves the value set using clutter_stage_set_use_alpha()
*
* Return value: %TRUE if the stage should honour the opacity and the
* alpha channel of the stage color
*
* Since: 1.2
*/
gboolean
clutter_stage_get_use_alpha (ClutterStage *stage)
{
g_return_val_if_fail (CLUTTER_IS_STAGE (stage), FALSE);
return stage->priv->use_alpha;
}
/**
* clutter_stage_set_minimum_size:
* @stage: a #ClutterStage
* @width: width, in pixels
* @height: height, in pixels
*
* Sets the minimum size for a stage window, if the default backend
* uses #ClutterStage inside a window
*
* This is a convenience function, and it is equivalent to setting the
* #ClutterActor:min-width and #ClutterActor:min-height on @stage
*
* If the current size of @stage is smaller than the minimum size, the
* @stage will be resized to the new @width and @height
*
* Since: 1.2
*/
void
clutter_stage_set_minimum_size (ClutterStage *stage,
guint width,
guint height)
{
g_return_if_fail (CLUTTER_IS_STAGE (stage));
g_return_if_fail ((width > 0) && (height > 0));
g_object_set (G_OBJECT (stage),
"min-width", (gfloat) width,
"min-height", (gfloat )height,
NULL);
}
/**
* clutter_stage_get_minimum_size:
* @stage: a #ClutterStage
* @width: (out): return location for the minimum width, in pixels,
* or %NULL
* @height: (out): return location for the minimum height, in pixels,
* or %NULL
*
* Retrieves the minimum size for a stage window as set using
* clutter_stage_set_minimum_size().
*
* The returned size may not correspond to the actual minimum size and
* it is specific to the #ClutterStage implementation inside the
* Clutter backend
*
* Since: 1.2
*/
void
clutter_stage_get_minimum_size (ClutterStage *stage,
guint *width_p,
guint *height_p)
{
gfloat width, height;
gboolean width_set, height_set;
g_return_if_fail (CLUTTER_IS_STAGE (stage));
g_object_get (G_OBJECT (stage),
"min-width", &width,
"min-width-set", &width_set,
"min-height", &height,
"min-height-set", &height_set,
NULL);
/* if not width or height have been set, then the Stage
* minimum size is defined to be 1x1
*/
if (!width_set)
width = 1;
if (!height_set)
height = 1;
if (width_p)
*width_p = (guint) width;
if (height_p)
*height_p = (guint) height;
}
/**
* _clutter_stage_schedule_update:
* @window: a #ClutterStage actor
*
* Schedules a redraw of the #ClutterStage at the next optimal timestamp.
*/
void
_clutter_stage_schedule_update (ClutterStage *stage)
{
ClutterStageWindow *stage_window;
if (CLUTTER_ACTOR_IN_DESTRUCTION (stage))
return;
stage_window = _clutter_stage_get_window (stage);
if (stage_window == NULL)
return;
return _clutter_stage_window_schedule_update (stage_window,
stage->priv->sync_delay);
}
/**
* _clutter_stage_get_update_time:
* @stage: a #ClutterStage actor
*
* Returns the earliest time in which the stage is ready to update. The update
* time is set when _clutter_stage_schedule_update() is called. This can then
* be used by e.g. the #ClutterMasterClock to know when the stage needs to be
* redrawn.
*
* Returns: -1 if no redraw is needed; 0 if the backend doesn't know, or the
* timestamp (in microseconds) otherwise.
*/
gint64
_clutter_stage_get_update_time (ClutterStage *stage)
{
ClutterStageWindow *stage_window;
if (CLUTTER_ACTOR_IN_DESTRUCTION (stage))
return 0;
stage_window = _clutter_stage_get_window (stage);
if (stage_window == NULL)
return 0;
return _clutter_stage_window_get_update_time (stage_window);
}
/**
* _clutter_stage_clear_update_time:
* @stage: a #ClutterStage actor
*
* Resets the update time. Call this after a redraw, so that the update time
* can again be updated.
*/
void
_clutter_stage_clear_update_time (ClutterStage *stage)
{
ClutterStageWindow *stage_window;
stage_window = _clutter_stage_get_window (stage);
if (stage_window)
_clutter_stage_window_clear_update_time (stage_window);
}
ClutterPaintVolume *
_clutter_stage_paint_volume_stack_allocate (ClutterStage *stage)
{
GArray *paint_volume_stack = stage->priv->paint_volume_stack;
g_array_set_size (paint_volume_stack,
paint_volume_stack->len+1);
return &g_array_index (paint_volume_stack,
ClutterPaintVolume,
paint_volume_stack->len - 1);
}
void
_clutter_stage_paint_volume_stack_free_all (ClutterStage *stage)
{
GArray *paint_volume_stack = stage->priv->paint_volume_stack;
int i;
for (i = 0; i < paint_volume_stack->len; i++)
{
ClutterPaintVolume *pv =
&g_array_index (paint_volume_stack, ClutterPaintVolume, i);
clutter_paint_volume_free (pv);
}
g_array_set_size (paint_volume_stack, 0);
}
/* The is an out-of-band paramater available while painting that
* can be used to cull actors. */
const ClutterPlane *
_clutter_stage_get_clip (ClutterStage *stage)
{
return stage->priv->current_clip_planes;
}
/* When an actor queues a redraw we add it to a list on the stage that
* gets processed once all updates to the stage have been finished.
*
* This deferred approach to processing queue_redraw requests means
* that we can avoid redundant transformations of clip volumes if
* something later triggers a full stage redraw anyway. It also means
* we can be more sure that all the referenced actors will have valid
* allocations improving the chance that we can determine the actors
* paint volume so we can clip the redraw request even if the user
* didn't explicitly do so.
*/
ClutterStageQueueRedrawEntry *
_clutter_stage_queue_actor_redraw (ClutterStage *stage,
ClutterStageQueueRedrawEntry *entry,
ClutterActor *actor,
const ClutterPaintVolume *clip)
{
ClutterStagePrivate *priv = stage->priv;
CLUTTER_NOTE (CLIPPING, "stage_queue_actor_redraw (actor=%s, clip=%p): ",
_clutter_actor_get_debug_name (actor), clip);
/* Queuing a redraw or clip change invalidates the pick cache, unless we're
* in the middle of building it. So we reset the cached flag but don't
* completely clear the pick stack...
*/
priv->cached_pick_mode = CLUTTER_PICK_NONE;
if (!priv->redraw_pending)
{
ClutterMasterClock *master_clock;
CLUTTER_NOTE (PAINT, "First redraw request");
_clutter_stage_schedule_update (stage);
priv->redraw_pending = TRUE;
master_clock = _clutter_master_clock_get_default ();
_clutter_master_clock_start_running (master_clock);
}
#ifdef CLUTTER_ENABLE_DEBUG
else
{
CLUTTER_NOTE (PAINT, "Redraw request number %lu",
priv->redraw_count + 1);
priv->redraw_count += 1;
}
#endif /* CLUTTER_ENABLE_DEBUG */
if (entry)
{
/* Ignore all requests to queue a redraw for an actor if a full
* (non-clipped) redraw of the actor has already been queued. */
if (!entry->has_clip)
{
CLUTTER_NOTE (CLIPPING, "Bail from stage_queue_actor_redraw (%s): "
"Unclipped redraw of actor already queued",
_clutter_actor_get_debug_name (actor));
return entry;
}
/* If queuing a clipped redraw and a clipped redraw has
* previously been queued for this actor then combine the latest
* clip together with the existing clip */
if (clip)
clutter_paint_volume_union (&entry->clip, clip);
else
{
clutter_paint_volume_free (&entry->clip);
entry->has_clip = FALSE;
}
return entry;
}
else
{
entry = g_slice_new (ClutterStageQueueRedrawEntry);
entry->actor = g_object_ref (actor);
if (clip)
{
entry->has_clip = TRUE;
_clutter_paint_volume_init_static (&entry->clip, actor);
_clutter_paint_volume_set_from_volume (&entry->clip, clip);
}
else
entry->has_clip = FALSE;
stage->priv->pending_queue_redraws =
g_list_prepend (stage->priv->pending_queue_redraws, entry);
return entry;
}
}
static void
free_queue_redraw_entry (ClutterStageQueueRedrawEntry *entry)
{
if (entry->actor)
g_object_unref (entry->actor);
if (entry->has_clip)
clutter_paint_volume_free (&entry->clip);
g_slice_free (ClutterStageQueueRedrawEntry, entry);
}
void
_clutter_stage_queue_redraw_entry_invalidate (ClutterStageQueueRedrawEntry *entry)
{
if (entry == NULL)
return;
if (entry->actor != NULL)
{
g_object_unref (entry->actor);
entry->actor = NULL;
}
if (entry->has_clip)
{
clutter_paint_volume_free (&entry->clip);
entry->has_clip = FALSE;
}
}
static void
clutter_stage_maybe_finish_queue_redraws (ClutterStage *stage)
{
/* Note: we have to repeat until the pending_queue_redraws list is
* empty because actors are allowed to queue redraws in response to
* the queue-redraw signal. For example Clone actors or
* texture_new_from_actor actors will have to queue a redraw if
* their source queues a redraw.
*/
while (stage->priv->pending_queue_redraws)
{
GList *l;
/* XXX: we need to allow stage->priv->pending_queue_redraws to
* be updated while we process the current entries in the list
* so we steal the list pointer and then reset it to an empty
* list before processing... */
GList *stolen_list = stage->priv->pending_queue_redraws;
stage->priv->pending_queue_redraws = NULL;
for (l = stolen_list; l; l = l->next)
{
ClutterStageQueueRedrawEntry *entry = l->data;
ClutterPaintVolume *clip;
/* NB: Entries may be invalidated if the actor gets destroyed */
if (G_LIKELY (entry->actor != NULL))
{
clip = entry->has_clip ? &entry->clip : NULL;
_clutter_actor_finish_queue_redraw (entry->actor, clip);
}
free_queue_redraw_entry (entry);
}
g_list_free (stolen_list);
}
}
/**
* clutter_stage_set_accept_focus:
* @stage: a #ClutterStage
* @accept_focus: %TRUE to accept focus on show
*
* Sets whether the @stage should accept the key focus when shown.
*
* This function should be called before showing @stage using
* clutter_actor_show().
*
* Since: 1.6
*/
void
clutter_stage_set_accept_focus (ClutterStage *stage,
gboolean accept_focus)
{
ClutterStagePrivate *priv;
g_return_if_fail (CLUTTER_IS_STAGE (stage));
accept_focus = !!accept_focus;
priv = stage->priv;
if (priv->accept_focus != accept_focus)
{
_clutter_stage_window_set_accept_focus (priv->impl, accept_focus);
g_object_notify_by_pspec (G_OBJECT (stage), obj_props[PROP_ACCEPT_FOCUS]);
}
}
/**
* clutter_stage_get_accept_focus:
* @stage: a #ClutterStage
*
* Retrieves the value set with clutter_stage_set_accept_focus().
*
* Return value: %TRUE if the #ClutterStage should accept focus, and %FALSE
* otherwise
*
* Since: 1.6
*/
gboolean
clutter_stage_get_accept_focus (ClutterStage *stage)
{
g_return_val_if_fail (CLUTTER_IS_STAGE (stage), TRUE);
return stage->priv->accept_focus;
}
/**
* clutter_stage_set_motion_events_enabled:
* @stage: a #ClutterStage
* @enabled: %TRUE to enable the motion events delivery, and %FALSE
* otherwise
*
* Sets whether per-actor motion events (and relative crossing
* events) should be disabled or not.
*
* The default is %TRUE.
*
* If @enable is %FALSE the following signals will not be emitted
* by the actors children of @stage:
*
* - #ClutterActor::motion-event
* - #ClutterActor::enter-event
* - #ClutterActor::leave-event
*
* The events will still be delivered to the #ClutterStage.
*
* The main side effect of this function is that disabling the motion
* events will disable picking to detect the #ClutterActor underneath
* the pointer for each motion event. This is useful, for instance,
* when dragging a #ClutterActor across the @stage: the actor underneath
* the pointer is not going to change, so it's meaningless to perform
* a pick.
*
* Since: 1.8
*/
void
clutter_stage_set_motion_events_enabled (ClutterStage *stage,
gboolean enabled)
{
ClutterStagePrivate *priv;
g_return_if_fail (CLUTTER_IS_STAGE (stage));
priv = stage->priv;
enabled = !!enabled;
if (priv->motion_events_enabled != enabled)
priv->motion_events_enabled = enabled;
}
/**
* clutter_stage_get_motion_events_enabled:
* @stage: a #ClutterStage
*
* Retrieves the value set using clutter_stage_set_motion_events_enabled().
*
* Return value: %TRUE if the per-actor motion event delivery is enabled
* and %FALSE otherwise
*
* Since: 1.8
*/
gboolean
clutter_stage_get_motion_events_enabled (ClutterStage *stage)
{
g_return_val_if_fail (CLUTTER_IS_STAGE (stage), FALSE);
return stage->priv->motion_events_enabled;
}
void
_clutter_stage_add_pointer_drag_actor (ClutterStage *stage,
ClutterInputDevice *device,
ClutterActor *actor)
{
GHashTable *drag_actors;
drag_actors = g_object_get_data (G_OBJECT (stage),
"__clutter_stage_pointer_drag_actors");
if (drag_actors == NULL)
{
drag_actors = g_hash_table_new (NULL, NULL);
g_object_set_data_full (G_OBJECT (stage),
"__clutter_stage_pointer_drag_actors",
drag_actors,
(GDestroyNotify) g_hash_table_destroy);
}
g_hash_table_replace (drag_actors, device, actor);
}
ClutterActor *
_clutter_stage_get_pointer_drag_actor (ClutterStage *stage,
ClutterInputDevice *device)
{
GHashTable *drag_actors;
drag_actors = g_object_get_data (G_OBJECT (stage),
"__clutter_stage_pointer_drag_actors");
if (drag_actors == NULL)
return NULL;
return g_hash_table_lookup (drag_actors, device);
}
void
_clutter_stage_remove_pointer_drag_actor (ClutterStage *stage,
ClutterInputDevice *device)
{
GHashTable *drag_actors;
drag_actors = g_object_get_data (G_OBJECT (stage),
"__clutter_stage_pointer_drag_actors");
if (drag_actors == NULL)
return;
g_hash_table_remove (drag_actors, device);
if (g_hash_table_size (drag_actors) == 0)
g_object_set_data (G_OBJECT (stage),
"__clutter_stage_pointer_drag_actors",
NULL);
}
void
_clutter_stage_add_touch_drag_actor (ClutterStage *stage,
ClutterEventSequence *sequence,
ClutterActor *actor)
{
GHashTable *drag_actors;
drag_actors = g_object_get_data (G_OBJECT (stage),
"__clutter_stage_touch_drag_actors");
if (drag_actors == NULL)
{
drag_actors = g_hash_table_new (NULL, NULL);
g_object_set_data_full (G_OBJECT (stage),
"__clutter_stage_touch_drag_actors",
drag_actors,
(GDestroyNotify) g_hash_table_destroy);
}
g_hash_table_replace (drag_actors, sequence, actor);
}
ClutterActor *
_clutter_stage_get_touch_drag_actor (ClutterStage *stage,
ClutterEventSequence *sequence)
{
GHashTable *drag_actors;
drag_actors = g_object_get_data (G_OBJECT (stage),
"__clutter_stage_touch_drag_actors");
if (drag_actors == NULL)
return NULL;
return g_hash_table_lookup (drag_actors, sequence);
}
void
_clutter_stage_remove_touch_drag_actor (ClutterStage *stage,
ClutterEventSequence *sequence)
{
GHashTable *drag_actors;
drag_actors = g_object_get_data (G_OBJECT (stage),
"__clutter_stage_touch_drag_actors");
if (drag_actors == NULL)
return;
g_hash_table_remove (drag_actors, sequence);
if (g_hash_table_size (drag_actors) == 0)
g_object_set_data (G_OBJECT (stage),
"__clutter_stage_touch_drag_actors",
NULL);
}
/*< private >
* _clutter_stage_get_state:
* @stage: a #ClutterStage
*
* Retrieves the current #ClutterStageState flags associated to the @stage.
*
* Return value: a bitwise OR of #ClutterStageState flags
*/
ClutterStageState
_clutter_stage_get_state (ClutterStage *stage)
{
return stage->priv->current_state;
}
/*< private >
* _clutter_stage_is_activated:
* @stage: a #ClutterStage
*
* Checks whether the @stage state includes %CLUTTER_STAGE_STATE_ACTIVATED.
*
* Return value: %TRUE if the @stage is active
*/
gboolean
_clutter_stage_is_activated (ClutterStage *stage)
{
return (stage->priv->current_state & CLUTTER_STAGE_STATE_ACTIVATED) != 0;
}
/*< private >
* _clutter_stage_update_state:
* @stage: a #ClutterStage
* @unset_flags: flags to unset
* @set_flags: flags to set
*
* Updates the state of @stage, by unsetting the @unset_flags and setting
* the @set_flags.
*
* If the stage state has been changed, this function will queue a
* #ClutterEvent of type %CLUTTER_STAGE_STATE.
*
* Return value: %TRUE if the state was updated, and %FALSE otherwise
*/
gboolean
_clutter_stage_update_state (ClutterStage *stage,
ClutterStageState unset_flags,
ClutterStageState set_flags)
{
ClutterStageState new_state;
ClutterEvent event;
new_state = stage->priv->current_state;
new_state |= set_flags;
new_state &= ~unset_flags;
if (new_state == stage->priv->current_state)
return FALSE;
memset (&event, 0, sizeof (event));
event.type = CLUTTER_STAGE_STATE;
clutter_event_set_stage (&event, stage);
event.stage_state.new_state = new_state;
event.stage_state.changed_mask = new_state ^ stage->priv->current_state;
stage->priv->current_state = new_state;
clutter_stage_event (stage, &event);
return TRUE;
}
/**
* clutter_stage_set_sync_delay:
* @stage: a #ClutterStage
* @sync_delay: number of milliseconds after frame presentation to wait
* before painting the next frame. If less than zero, restores the
* default behavior where redraw is throttled to the refresh rate but
* not synchronized to it.
*
* This function enables an alternate behavior where Clutter draws at
* a fixed point in time after the frame presentation time (also known
* as the VBlank time). This is most useful when the application
* wants to show incoming data with predictable latency. (The primary
* example of this would be a window system compositor.) By synchronizing
* to provide new data before Clutter redraws, an external source of
* updates (in the compositor, an application) can get a reliable latency.
*
* The appropriate value of @sync_delay depends on the complexity of
* drawing the stage's scene graph - in general a value of between 0
* and 8 ms (up to one-half of a typical 60hz frame rate) is appropriate.
* using a larger value will reduce latency but risks skipping a frame if
* drawing the stage takes too long.
*
* Since: 1.14
* Stability: unstable
*/
void
clutter_stage_set_sync_delay (ClutterStage *stage,
gint sync_delay)
{
g_return_if_fail (CLUTTER_IS_STAGE (stage));
stage->priv->sync_delay = sync_delay;
}
/**
* clutter_stage_skip_sync_delay:
* @stage: a #ClutterStage
*
* Causes the next frame for the stage to be drawn as quickly as
* possible, ignoring any delay that clutter_stage_set_sync_delay()
* would normally cause.
*
* Since: 1.14
* Stability: unstable
*/
void
clutter_stage_skip_sync_delay (ClutterStage *stage)
{
ClutterStageWindow *stage_window;
stage_window = _clutter_stage_get_window (stage);
if (stage_window)
_clutter_stage_window_schedule_update (stage_window, -1);
}
int64_t
clutter_stage_get_frame_counter (ClutterStage *stage)
{
ClutterStageWindow *stage_window;
stage_window = _clutter_stage_get_window (stage);
return _clutter_stage_window_get_frame_counter (stage_window);
}
void
_clutter_stage_presented (ClutterStage *stage,
CoglFrameEvent frame_event,
ClutterFrameInfo *frame_info)
{
g_signal_emit (stage, stage_signals[PRESENTED], 0,
(int) frame_event, frame_info);
}
static void
capture_view (ClutterStage *stage,
gboolean paint,
ClutterStageView *view,
ClutterCapture *capture)
{
cairo_surface_t *image;
uint8_t *data;
int stride;
cairo_rectangle_int_t *rect;
float view_scale;
float texture_width;
float texture_height;
rect = &capture->rect;
view_scale = clutter_stage_view_get_scale (view);
texture_width = roundf (rect->width * view_scale);
texture_height = roundf (rect->height * view_scale);
image = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
texture_width, texture_height);
cairo_surface_set_device_scale (image, view_scale, view_scale);
data = cairo_image_surface_get_data (image);
stride = cairo_image_surface_get_stride (image);
capture_view_into (stage, paint, view, rect, data, stride);
capture->image = image;
cairo_surface_mark_dirty (capture->image);
}
/**
* clutter_stage_capture:
* @stage: a #ClutterStage
* @paint: whether to pain the frame
* @rect: a #cairo_rectangle_int_t in stage coordinates
* @out_captures: (out) (array length=out_n_captures): an array of
* #ClutterCapture
* @out_n_captures: (out): the number of captures in @out_captures
*
* Captures the stage pixels of @rect into @captures. @rect is in stage
* coordinates.
*
* Returns: %TRUE if a #ClutterCapture has been created, %FALSE otherwise
*/
gboolean
clutter_stage_capture (ClutterStage *stage,
gboolean paint,
cairo_rectangle_int_t *rect,
ClutterCapture **out_captures,
int *out_n_captures)
{
ClutterStagePrivate *priv = stage->priv;
GList *views = _clutter_stage_window_get_views (priv->impl);
GList *l;
ClutterCapture *captures;
int n_captures;
g_return_val_if_fail (CLUTTER_IS_STAGE (stage), FALSE);
captures = g_new0 (ClutterCapture, g_list_length (views));
n_captures = 0;
for (l = views; l; l = l->next)
{
ClutterStageView *view = l->data;
ClutterCapture *capture;
cairo_rectangle_int_t view_layout;
cairo_region_t *region;
clutter_stage_view_get_layout (view, &view_layout);
region = cairo_region_create_rectangle (&view_layout);
cairo_region_intersect_rectangle (region, rect);
capture = &captures[n_captures];
cairo_region_get_extents (region, &capture->rect);
cairo_region_destroy (region);
if (capture->rect.width == 0 || capture->rect.height == 0)
continue;
capture_view (stage, paint, view, capture);
n_captures++;
}
if (n_captures == 0)
g_clear_pointer (&captures, g_free);
*out_captures = captures;
*out_n_captures = n_captures;
return n_captures > 0;
}
gboolean
clutter_stage_get_capture_final_size (ClutterStage *stage,
cairo_rectangle_int_t *rect,
int *out_width,
int *out_height,
float *out_scale)
{
float max_scale;
g_return_val_if_fail (CLUTTER_IS_STAGE (stage), FALSE);
if (rect)
{
graphene_rect_t capture_rect;
_clutter_util_rect_from_rectangle (rect, &capture_rect);
if (!_clutter_stage_get_max_view_scale_factor_for_rect (stage,
&capture_rect,
&max_scale))
return FALSE;
if (out_width)
*out_width = (gint) roundf (rect->width * max_scale);
if (out_height)
*out_height = (gint) roundf (rect->height * max_scale);
}
else
{
ClutterActorBox alloc;
float stage_width, stage_height;
clutter_actor_get_allocation_box (CLUTTER_ACTOR (stage), &alloc);
clutter_actor_box_get_size (&alloc, &stage_width, &stage_height);
if (!_clutter_actor_get_real_resource_scale (CLUTTER_ACTOR (stage),
&max_scale))
return FALSE;
if (out_width)
*out_width = (gint) roundf (stage_width * max_scale);
if (out_height)
*out_height = (gint) roundf (stage_height * max_scale);
}
if (out_scale)
*out_scale = max_scale;
return TRUE;
}
static void
capture_view_into (ClutterStage *stage,
gboolean paint,
ClutterStageView *view,
cairo_rectangle_int_t *rect,
uint8_t *data,
int stride)
{
CoglFramebuffer *framebuffer;
ClutterBackend *backend;
CoglContext *context;
CoglBitmap *bitmap;
cairo_rectangle_int_t view_layout;
float view_scale;
float texture_width;
float texture_height;
g_return_if_fail (CLUTTER_IS_STAGE (stage));
framebuffer = clutter_stage_view_get_framebuffer (view);
if (paint)
{
cairo_region_t *region;
_clutter_stage_maybe_setup_viewport (stage, view);
region = cairo_region_create_rectangle (rect);
clutter_stage_do_paint_view (stage, view, region);
cairo_region_destroy (region);
}
view_scale = clutter_stage_view_get_scale (view);
texture_width = roundf (rect->width * view_scale);
texture_height = roundf (rect->height * view_scale);
backend = clutter_get_default_backend ();
context = clutter_backend_get_cogl_context (backend);
bitmap = cogl_bitmap_new_for_data (context,
texture_width, texture_height,
CLUTTER_CAIRO_FORMAT_ARGB32,
stride,
data);
clutter_stage_view_get_layout (view, &view_layout);
cogl_framebuffer_read_pixels_into_bitmap (framebuffer,
roundf ((rect->x - view_layout.x) * view_scale),
roundf ((rect->y - view_layout.y) * view_scale),
COGL_READ_PIXELS_COLOR_BUFFER,
bitmap);
cogl_object_unref (bitmap);
}
void
clutter_stage_capture_into (ClutterStage *stage,
gboolean paint,
cairo_rectangle_int_t *rect,
uint8_t *data)
{
ClutterStagePrivate *priv = stage->priv;
GList *l;
int bpp = 4;
int stride;
stride = rect->width * 4;
for (l = _clutter_stage_window_get_views (priv->impl); l; l = l->next)
{
ClutterStageView *view = l->data;
cairo_rectangle_int_t view_layout;
cairo_region_t *region;
cairo_rectangle_int_t capture_rect;
int x_offset, y_offset;
clutter_stage_view_get_layout (view, &view_layout);
region = cairo_region_create_rectangle (&view_layout);
cairo_region_intersect_rectangle (region, rect);
cairo_region_get_extents (region, &capture_rect);
cairo_region_destroy (region);
x_offset = capture_rect.x - rect->x;
y_offset = capture_rect.y - rect->y;
capture_view_into (stage, paint, view,
&capture_rect,
data + (x_offset * bpp) + (y_offset * stride),
stride);
}
}
/**
* clutter_stage_freeze_updates:
*
* Freezing updates makes Clutter stop processing events,
* redrawing, and advancing timelines, by pausing the master clock. This is
* necessary when implementing a display server, to ensure that Clutter doesn't
* keep trying to page flip when DRM master has been dropped, e.g. when VT
* switched away.
*
* The master clock starts out running, so if you are VT switched away on
* startup, you need to call this immediately.
*
* To thaw updates, use clutter_stage_thaw_updates().
*/
void
clutter_stage_freeze_updates (ClutterStage *stage)
{
ClutterStagePrivate *priv = stage->priv;
priv->update_freeze_count++;
if (priv->update_freeze_count == 1)
{
ClutterMasterClock *master_clock;
master_clock = _clutter_master_clock_get_default ();
_clutter_master_clock_set_paused (master_clock, TRUE);
}
}
/**
* clutter_stage_thaw_updates:
*
* Resumes a master clock that has previously been frozen with
* clutter_stage_freeze_updates(), and start pumping the master clock
* again at the next iteration. Note that if you're switching back to your
* own VT, you should probably also queue a stage redraw with
* clutter_stage_ensure_redraw().
*/
void
clutter_stage_thaw_updates (ClutterStage *stage)
{
ClutterStagePrivate *priv = stage->priv;
g_assert (priv->update_freeze_count > 0);
priv->update_freeze_count--;
if (priv->update_freeze_count == 0)
{
ClutterMasterClock *master_clock;
master_clock = _clutter_master_clock_get_default ();
_clutter_master_clock_set_paused (master_clock, FALSE);
}
}
GList *
_clutter_stage_peek_stage_views (ClutterStage *stage)
{
ClutterStagePrivate *priv = stage->priv;
return _clutter_stage_window_get_views (priv->impl);
}
void
clutter_stage_update_resource_scales (ClutterStage *stage)
{
_clutter_actor_queue_update_resource_scale_recursive (CLUTTER_ACTOR (stage));
}
gboolean
_clutter_stage_get_max_view_scale_factor_for_rect (ClutterStage *stage,
graphene_rect_t *rect,
float *view_scale)
{
ClutterStagePrivate *priv = stage->priv;
float scale = 0.0f;
GList *l;
for (l = _clutter_stage_window_get_views (priv->impl); l; l = l->next)
{
ClutterStageView *view = l->data;
cairo_rectangle_int_t view_layout;
graphene_rect_t view_rect;
clutter_stage_view_get_layout (view, &view_layout);
_clutter_util_rect_from_rectangle (&view_layout, &view_rect);
if (graphene_rect_intersection (&view_rect, rect, NULL))
scale = MAX (clutter_stage_view_get_scale (view), scale);
}
if (scale == 0.0)
return FALSE;
*view_scale = scale;
return TRUE;
}
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