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MetaBackgroundActor: allow creating multiple instances

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Instead of requiring a singleton MetaBackgroundActor for the screen,
allow creating multiple copies that internally share a single
CoglTexture behind the scenes. This will be useful for allowing
multiple views of the screen background with different rendering
options.

https://bugzilla.gnome.org/show_bug.cgi?id=656433
This commit is contained in:
Owen W. Taylor 2011-08-28 14:09:42 -04:00
parent a75c4d2cc9
commit c630046858
3 changed files with 175 additions and 86 deletions
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5
src/compositor/compositor.c
View File

@ -125,8 +125,7 @@ process_property_notify (MetaCompositor *compositor,
MetaScreen *screen = l->data;
if (event->window == meta_screen_get_xroot (screen))
{
MetaCompScreen *info = meta_screen_get_compositor_data (screen);
meta_background_actor_update (META_BACKGROUND_ACTOR (info->background_actor));
meta_background_actor_update (screen);
return;
}
}
@ -1087,7 +1086,7 @@ meta_compositor_sync_screen_size (MetaCompositor *compositor,
clutter_actor_set_size (info->stage, width, height);
meta_background_actor_screen_size_changed (META_BACKGROUND_ACTOR (info->background_actor));
meta_background_actor_screen_size_changed (screen);
meta_verbose ("Changed size for stage on screen %d to %dx%d\n",
meta_screen_get_screen_number (screen),

251
src/compositor/meta-background-actor.c
View File

@ -35,6 +35,28 @@
#include <meta/errors.h>
#include "meta-background-actor.h"
/* We allow creating multiple MetaBackgroundActors for the same MetaScreen to
* allow different rendering options to be set for different copies.
* But we want to share the same underlying CoglTexture for efficiency and
* to avoid driver bugs that might occur if we created multiple CoglTexturePixmaps
* for the same pixmap.
*
* This structure holds common information.
*/
typedef struct _MetaScreenBackground MetaScreenBackground;
struct _MetaScreenBackground
{
MetaScreen *screen;
GSList *actors;
float texture_width;
float texture_height;
CoglHandle texture;
CoglMaterialWrapMode wrap_mode;
guint have_pixmap : 1;
};
struct _MetaBackgroundActorClass
{
ClutterActorClass parent_class;
@ -44,60 +66,139 @@ struct _MetaBackgroundActor
{
ClutterActor parent;
MetaScreenBackground *background;
CoglHandle material;
MetaScreen *screen;
cairo_region_t *visible_region;
float texture_width;
float texture_height;
guint have_pixmap : 1;
};
G_DEFINE_TYPE (MetaBackgroundActor, meta_background_actor, CLUTTER_TYPE_ACTOR);
static void
update_wrap_mode (MetaBackgroundActor *self)
{
int width, height;
CoglMaterialWrapMode wrap_mode;
static void set_texture (MetaScreenBackground *background,
CoglHandle texture);
static void set_texture_to_stage_color (MetaScreenBackground *background);
meta_screen_get_size (self->screen, &width, &height);
static void
on_notify_stage_color (GObject *stage,
GParamSpec *pspec,
MetaScreenBackground *background)
{
if (!background->have_pixmap)
set_texture_to_stage_color (background);
}
static void
free_screen_background (MetaScreenBackground *background)
{
set_texture (background, COGL_INVALID_HANDLE);
if (background->screen != NULL)
{
ClutterActor *stage = meta_get_stage_for_screen (background->screen);
g_signal_handlers_disconnect_by_func (stage,
(gpointer) on_notify_stage_color,
background);
background->screen = NULL;
}
}
static MetaScreenBackground *
meta_screen_background_get (MetaScreen *screen)
{
MetaScreenBackground *background;
background = g_object_get_data (G_OBJECT (screen), "meta-screen-background");
if (background == NULL)
{
ClutterActor *stage;
background = g_new0 (MetaScreenBackground, 1);
background->screen = screen;
g_object_set_data_full (G_OBJECT (screen), "meta-screen-background",
background, (GDestroyNotify) free_screen_background);
stage = meta_get_stage_for_screen (screen);
g_signal_connect (stage, "notify::color",
G_CALLBACK (on_notify_stage_color), background);
meta_background_actor_update (screen);
}
return background;
}
static void
update_wrap_mode_of_actor (MetaBackgroundActor *self)
{
cogl_material_set_layer_wrap_mode (self->material, 0, self->background->wrap_mode);
}
static void
update_wrap_mode (MetaScreenBackground *background)
{
GSList *l;
int width, height;
meta_screen_get_size (background->screen, &width, &height);
/* We turn off repeating when we have a full-screen pixmap to keep from
* getting artifacts from one side of the image sneaking into the other
* side of the image via bilinear filtering.
*/
if (width == self->texture_width && height == self->texture_height)
wrap_mode = COGL_MATERIAL_WRAP_MODE_CLAMP_TO_EDGE;
if (width == background->texture_width && height == background->texture_height)
background->wrap_mode = COGL_MATERIAL_WRAP_MODE_CLAMP_TO_EDGE;
else
wrap_mode = COGL_MATERIAL_WRAP_MODE_REPEAT;
background->wrap_mode = COGL_MATERIAL_WRAP_MODE_REPEAT;
cogl_material_set_layer_wrap_mode (self->material, 0, wrap_mode);
for (l = background->actors; l; l = l->next)
update_wrap_mode_of_actor (l->data);
}
static void
set_texture (MetaBackgroundActor *self,
CoglHandle texture)
set_texture_on_actor (MetaBackgroundActor *self)
{
MetaDisplay *display;
display = meta_screen_get_display (self->screen);
MetaDisplay *display = meta_screen_get_display (self->background->screen);
/* This may trigger destruction of an old texture pixmap, which, if
* the underlying X pixmap is already gone has the tendency to trigger
* X errors inside DRI. For safety, trap errors */
meta_error_trap_push (display);
cogl_material_set_layer (self->material, 0, texture);
cogl_material_set_layer (self->material, 0, self->background->texture);
meta_error_trap_pop (display);
self->texture_width = cogl_texture_get_width (texture);
self->texture_height = cogl_texture_get_height (texture);
update_wrap_mode (self);
clutter_actor_queue_redraw (CLUTTER_ACTOR (self));
}
static void
set_texture (MetaScreenBackground *background,
CoglHandle texture)
{
MetaDisplay *display = meta_screen_get_display (background->screen);
GSList *l;
/* This may trigger destruction of an old texture pixmap, which, if
* the underlying X pixmap is already gone has the tendency to trigger
* X errors inside DRI. For safety, trap errors */
meta_error_trap_push (display);
if (background->texture != COGL_INVALID_HANDLE)
{
cogl_handle_unref (background->texture);
background->texture = COGL_INVALID_HANDLE;
}
meta_error_trap_pop (display);
if (texture != COGL_INVALID_HANDLE)
background->texture = cogl_handle_ref (texture);
background->texture_width = cogl_texture_get_width (background->texture);
background->texture_height = cogl_texture_get_height (background->texture);
for (l = background->actors; l; l = l->next)
set_texture_on_actor (l->data);
update_wrap_mode (background);
}
/* Sets our material to paint with a 1x1 texture of the stage's background
* color; doing this when we have no pixmap allows the application to turn
* off painting the stage. There might be a performance benefit to
@ -106,9 +207,9 @@ set_texture (MetaBackgroundActor *self,
* actually pick up the (small?) performance win. This is just a fallback.
*/
static void
set_texture_to_stage_color (MetaBackgroundActor *self)
set_texture_to_stage_color (MetaScreenBackground *background)
{
ClutterActor *stage = meta_get_stage_for_screen (self->screen);
ClutterActor *stage = meta_get_stage_for_screen (background->screen);
ClutterColor color;
CoglHandle texture;
@ -120,19 +221,10 @@ set_texture_to_stage_color (MetaBackgroundActor *self)
texture = meta_create_color_texture_4ub (color.red, color.green,
color.blue, 0xff,
COGL_TEXTURE_NO_SLICING);
set_texture (self, texture);
set_texture (background, texture);
cogl_handle_unref (texture);
}
static void
on_notify_stage_color (GObject *stage,
GParamSpec *pspec,
MetaBackgroundActor *self)
{
if (!self->have_pixmap)
set_texture_to_stage_color (self);
}
static void
meta_background_actor_dispose (GObject *object)
{
@ -140,20 +232,17 @@ meta_background_actor_dispose (GObject *object)
meta_background_actor_set_visible_region (self, NULL);
if (self->background != NULL)
{
self->background->actors = g_slist_remove (self->background->actors, self);
self->background = NULL;
}
if (self->material != COGL_INVALID_HANDLE)
{
cogl_handle_unref (self->material);
self->material = COGL_INVALID_HANDLE;
}
if (self->screen != NULL)
{
ClutterActor *stage = meta_get_stage_for_screen (self->screen);
g_signal_handlers_disconnect_by_func (stage,
(gpointer) on_notify_stage_color,
self);
self->screen = NULL;
}
}
static void
@ -165,7 +254,7 @@ meta_background_actor_get_preferred_width (ClutterActor *actor,
MetaBackgroundActor *self = META_BACKGROUND_ACTOR (actor);
int width, height;
meta_screen_get_size (self->screen, &width, &height);
meta_screen_get_size (self->background->screen, &width, &height);
if (min_width_p)
*min_width_p = width;
@ -183,7 +272,7 @@ meta_background_actor_get_preferred_height (ClutterActor *actor,
MetaBackgroundActor *self = META_BACKGROUND_ACTOR (actor);
int width, height;
meta_screen_get_size (self->screen, &width, &height);
meta_screen_get_size (self->background->screen, &width, &height);
if (min_height_p)
*min_height_p = height;
@ -198,7 +287,7 @@ meta_background_actor_paint (ClutterActor *actor)
guchar opacity = clutter_actor_get_paint_opacity (actor);
int width, height;
meta_screen_get_size (self->screen, &width, &height);
meta_screen_get_size (self->background->screen, &width, &height);
cogl_material_set_color4ub (self->material,
opacity, opacity, opacity, opacity);
@ -217,10 +306,10 @@ meta_background_actor_paint (ClutterActor *actor)
cogl_rectangle_with_texture_coords (rect.x, rect.y,
rect.x + rect.width, rect.y + rect.height,
rect.x / self->texture_width,
rect.y / self->texture_height,
(rect.x + rect.width) / self->texture_width,
(rect.y + rect.height) / self->texture_height);
rect.x / self->background->texture_width,
rect.y / self->background->texture_height,
(rect.x + rect.width) / self->background->texture_width,
(rect.y + rect.height) / self->background->texture_height);
}
}
else
@ -228,8 +317,8 @@ meta_background_actor_paint (ClutterActor *actor)
cogl_rectangle_with_texture_coords (0.0f, 0.0f,
width, height,
0.0f, 0.0f,
width / self->texture_width,
height / self->texture_height);
width / self->background->texture_width,
height / self->background->texture_height);
}
}
@ -240,7 +329,7 @@ meta_background_actor_get_paint_volume (ClutterActor *actor,
MetaBackgroundActor *self = META_BACKGROUND_ACTOR (actor);
int width, height;
meta_screen_get_size (self->screen, &width, &height);
meta_screen_get_size (self->background->screen, &width, &height);
clutter_paint_volume_set_width (volume, width);
clutter_paint_volume_set_height (volume, height);
@ -279,30 +368,25 @@ ClutterActor *
meta_background_actor_new (MetaScreen *screen)
{
MetaBackgroundActor *self;
ClutterActor *stage;
g_return_val_if_fail (META_IS_SCREEN (screen), NULL);
self = g_object_new (META_TYPE_BACKGROUND_ACTOR, NULL);
self->screen = screen;
self->background = meta_screen_background_get (screen);
self->background->actors = g_slist_prepend (self->background->actors, self);
self->material = meta_create_texture_material (NULL);
cogl_material_set_layer_wrap_mode (self->material, 0,
COGL_MATERIAL_WRAP_MODE_REPEAT);
stage = meta_get_stage_for_screen (self->screen);
g_signal_connect (stage, "notify::color",
G_CALLBACK (on_notify_stage_color), self);
meta_background_actor_update (self);
set_texture_on_actor (self);
update_wrap_mode_of_actor (self);
return CLUTTER_ACTOR (self);
}
/**
* meta_background_actor_update:
* @self: a #MetaBackgroundActor
* @screen: a #MetaScreen
*
* Refetches the _XROOTPMAP_ID property for the root window and updates
* the contents of the background actor based on that. There's no attempt
@ -312,8 +396,9 @@ meta_background_actor_new (MetaScreen *screen)
* a PropertyNotify event for the property.
*/
void
meta_background_actor_update (MetaBackgroundActor *self)
meta_background_actor_update (MetaScreen *screen)
{
MetaScreenBackground *background;
MetaDisplay *display;
MetaCompositor *compositor;
Atom type;
@ -323,14 +408,13 @@ meta_background_actor_update (MetaBackgroundActor *self)
guchar *data;
Pixmap root_pixmap_id;
g_return_if_fail (META_IS_BACKGROUND_ACTOR (self));
display = meta_screen_get_display (self->screen);
background = meta_screen_background_get (screen);
display = meta_screen_get_display (screen);
compositor = meta_display_get_compositor (display);
root_pixmap_id = None;
if (!XGetWindowProperty (meta_display_get_xdisplay (display),
meta_screen_get_xroot (self->screen),
meta_screen_get_xroot (screen),
compositor->atom_x_root_pixmap,
0, LONG_MAX,
False,
@ -358,16 +442,16 @@ meta_background_actor_update (MetaBackgroundActor *self)
if (texture != COGL_INVALID_HANDLE)
{
set_texture (self, texture);
set_texture (background, texture);
cogl_handle_unref (texture);
self->have_pixmap = True;
background->have_pixmap = True;
return;
}
}
self->have_pixmap = False;
set_texture_to_stage_color (self);
background->have_pixmap = False;
set_texture_to_stage_color (background);
}
/**
@ -394,7 +478,7 @@ meta_background_actor_set_visible_region (MetaBackgroundActor *self,
if (visible_region)
{
cairo_rectangle_int_t screen_rect = { 0 };
meta_screen_get_size (self->screen, &screen_rect.width, &screen_rect.height);
meta_screen_get_size (self->background->screen, &screen_rect.width, &screen_rect.height);
/* Doing the intersection here is probably unnecessary - MetaWindowGroup
* should never compute a visible area that's larger than the root screen!
@ -407,13 +491,18 @@ meta_background_actor_set_visible_region (MetaBackgroundActor *self,
/**
* meta_background_actor_screen_size_changed:
* @self: a #MetaBackgroundActor
* @screen: a #MetaScreen
*
* Called by the compositor when the size of the #MetaScreen changes
*/
void
meta_background_actor_screen_size_changed (MetaBackgroundActor *self)
meta_background_actor_screen_size_changed (MetaScreen *screen)
{
update_wrap_mode (self);
clutter_actor_queue_relayout (CLUTTER_ACTOR (self));
MetaScreenBackground *background = meta_screen_background_get (screen);
GSList *l;
update_wrap_mode (background);
for (l = background->actors; l; l = l->next)
clutter_actor_queue_relayout (l->data);
}

5
src/compositor/meta-background-actor.h
View File

@ -50,9 +50,10 @@ GType meta_background_actor_get_type (void);
ClutterActor *meta_background_actor_new (MetaScreen *screen);
void meta_background_actor_update (MetaBackgroundActor *actor);
void meta_background_actor_set_visible_region (MetaBackgroundActor *self,
cairo_region_t *visible_region);
void meta_background_actor_screen_size_changed (MetaBackgroundActor *self);
void meta_background_actor_update (MetaScreen *screen);
void meta_background_actor_screen_size_changed (MetaScreen *screen);
#endif /* META_BACKGROUND_ACTOR_H */