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MetaBackgroundActor: allow creating multiple instances
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
parent
a75c4d2cc9
commit
c630046858
@ -125,8 +125,7 @@ process_property_notify (MetaCompositor *compositor,
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MetaScreen *screen = l->data;
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if (event->window == meta_screen_get_xroot (screen))
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{
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MetaCompScreen *info = meta_screen_get_compositor_data (screen);
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meta_background_actor_update (META_BACKGROUND_ACTOR (info->background_actor));
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meta_background_actor_update (screen);
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return;
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}
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}
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@ -1087,7 +1086,7 @@ meta_compositor_sync_screen_size (MetaCompositor *compositor,
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clutter_actor_set_size (info->stage, width, height);
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meta_background_actor_screen_size_changed (META_BACKGROUND_ACTOR (info->background_actor));
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meta_background_actor_screen_size_changed (screen);
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meta_verbose ("Changed size for stage on screen %d to %dx%d\n",
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meta_screen_get_screen_number (screen),
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@ -35,6 +35,28 @@
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#include <meta/errors.h>
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#include "meta-background-actor.h"
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/* We allow creating multiple MetaBackgroundActors for the same MetaScreen to
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* allow different rendering options to be set for different copies.
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* But we want to share the same underlying CoglTexture for efficiency and
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* to avoid driver bugs that might occur if we created multiple CoglTexturePixmaps
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* for the same pixmap.
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*
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* This structure holds common information.
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*/
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typedef struct _MetaScreenBackground MetaScreenBackground;
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struct _MetaScreenBackground
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{
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MetaScreen *screen;
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GSList *actors;
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float texture_width;
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float texture_height;
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CoglHandle texture;
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CoglMaterialWrapMode wrap_mode;
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guint have_pixmap : 1;
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};
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struct _MetaBackgroundActorClass
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{
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ClutterActorClass parent_class;
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@ -44,60 +66,139 @@ struct _MetaBackgroundActor
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{
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ClutterActor parent;
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MetaScreenBackground *background;
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CoglHandle material;
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MetaScreen *screen;
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cairo_region_t *visible_region;
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float texture_width;
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float texture_height;
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guint have_pixmap : 1;
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};
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G_DEFINE_TYPE (MetaBackgroundActor, meta_background_actor, CLUTTER_TYPE_ACTOR);
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static void
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update_wrap_mode (MetaBackgroundActor *self)
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{
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int width, height;
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CoglMaterialWrapMode wrap_mode;
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static void set_texture (MetaScreenBackground *background,
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CoglHandle texture);
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static void set_texture_to_stage_color (MetaScreenBackground *background);
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meta_screen_get_size (self->screen, &width, &height);
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static void
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on_notify_stage_color (GObject *stage,
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GParamSpec *pspec,
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MetaScreenBackground *background)
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{
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if (!background->have_pixmap)
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set_texture_to_stage_color (background);
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}
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static void
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free_screen_background (MetaScreenBackground *background)
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{
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set_texture (background, COGL_INVALID_HANDLE);
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if (background->screen != NULL)
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{
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ClutterActor *stage = meta_get_stage_for_screen (background->screen);
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g_signal_handlers_disconnect_by_func (stage,
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(gpointer) on_notify_stage_color,
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background);
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background->screen = NULL;
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}
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}
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static MetaScreenBackground *
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meta_screen_background_get (MetaScreen *screen)
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{
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MetaScreenBackground *background;
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background = g_object_get_data (G_OBJECT (screen), "meta-screen-background");
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if (background == NULL)
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{
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ClutterActor *stage;
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background = g_new0 (MetaScreenBackground, 1);
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background->screen = screen;
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g_object_set_data_full (G_OBJECT (screen), "meta-screen-background",
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background, (GDestroyNotify) free_screen_background);
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stage = meta_get_stage_for_screen (screen);
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g_signal_connect (stage, "notify::color",
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G_CALLBACK (on_notify_stage_color), background);
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meta_background_actor_update (screen);
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}
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return background;
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}
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static void
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update_wrap_mode_of_actor (MetaBackgroundActor *self)
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{
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cogl_material_set_layer_wrap_mode (self->material, 0, self->background->wrap_mode);
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}
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static void
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update_wrap_mode (MetaScreenBackground *background)
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{
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GSList *l;
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int width, height;
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meta_screen_get_size (background->screen, &width, &height);
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/* We turn off repeating when we have a full-screen pixmap to keep from
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* getting artifacts from one side of the image sneaking into the other
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* side of the image via bilinear filtering.
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*/
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if (width == self->texture_width && height == self->texture_height)
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wrap_mode = COGL_MATERIAL_WRAP_MODE_CLAMP_TO_EDGE;
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if (width == background->texture_width && height == background->texture_height)
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background->wrap_mode = COGL_MATERIAL_WRAP_MODE_CLAMP_TO_EDGE;
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else
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wrap_mode = COGL_MATERIAL_WRAP_MODE_REPEAT;
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background->wrap_mode = COGL_MATERIAL_WRAP_MODE_REPEAT;
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cogl_material_set_layer_wrap_mode (self->material, 0, wrap_mode);
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for (l = background->actors; l; l = l->next)
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update_wrap_mode_of_actor (l->data);
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}
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static void
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set_texture (MetaBackgroundActor *self,
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CoglHandle texture)
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set_texture_on_actor (MetaBackgroundActor *self)
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{
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MetaDisplay *display;
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display = meta_screen_get_display (self->screen);
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MetaDisplay *display = meta_screen_get_display (self->background->screen);
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/* This may trigger destruction of an old texture pixmap, which, if
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* the underlying X pixmap is already gone has the tendency to trigger
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* X errors inside DRI. For safety, trap errors */
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meta_error_trap_push (display);
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cogl_material_set_layer (self->material, 0, texture);
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cogl_material_set_layer (self->material, 0, self->background->texture);
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meta_error_trap_pop (display);
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self->texture_width = cogl_texture_get_width (texture);
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self->texture_height = cogl_texture_get_height (texture);
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update_wrap_mode (self);
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clutter_actor_queue_redraw (CLUTTER_ACTOR (self));
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}
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static void
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set_texture (MetaScreenBackground *background,
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CoglHandle texture)
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{
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MetaDisplay *display = meta_screen_get_display (background->screen);
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GSList *l;
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/* This may trigger destruction of an old texture pixmap, which, if
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* the underlying X pixmap is already gone has the tendency to trigger
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* X errors inside DRI. For safety, trap errors */
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meta_error_trap_push (display);
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if (background->texture != COGL_INVALID_HANDLE)
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{
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cogl_handle_unref (background->texture);
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background->texture = COGL_INVALID_HANDLE;
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}
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meta_error_trap_pop (display);
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if (texture != COGL_INVALID_HANDLE)
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background->texture = cogl_handle_ref (texture);
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background->texture_width = cogl_texture_get_width (background->texture);
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background->texture_height = cogl_texture_get_height (background->texture);
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for (l = background->actors; l; l = l->next)
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set_texture_on_actor (l->data);
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update_wrap_mode (background);
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}
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/* Sets our material to paint with a 1x1 texture of the stage's background
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* color; doing this when we have no pixmap allows the application to turn
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* off painting the stage. There might be a performance benefit to
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@ -106,9 +207,9 @@ set_texture (MetaBackgroundActor *self,
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* actually pick up the (small?) performance win. This is just a fallback.
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*/
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static void
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set_texture_to_stage_color (MetaBackgroundActor *self)
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set_texture_to_stage_color (MetaScreenBackground *background)
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{
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ClutterActor *stage = meta_get_stage_for_screen (self->screen);
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ClutterActor *stage = meta_get_stage_for_screen (background->screen);
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ClutterColor color;
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CoglHandle texture;
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@ -120,19 +221,10 @@ set_texture_to_stage_color (MetaBackgroundActor *self)
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texture = meta_create_color_texture_4ub (color.red, color.green,
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color.blue, 0xff,
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COGL_TEXTURE_NO_SLICING);
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set_texture (self, texture);
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set_texture (background, texture);
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cogl_handle_unref (texture);
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}
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static void
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on_notify_stage_color (GObject *stage,
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GParamSpec *pspec,
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MetaBackgroundActor *self)
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{
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if (!self->have_pixmap)
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set_texture_to_stage_color (self);
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}
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static void
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meta_background_actor_dispose (GObject *object)
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{
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@ -140,20 +232,17 @@ meta_background_actor_dispose (GObject *object)
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meta_background_actor_set_visible_region (self, NULL);
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if (self->background != NULL)
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{
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self->background->actors = g_slist_remove (self->background->actors, self);
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self->background = NULL;
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}
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if (self->material != COGL_INVALID_HANDLE)
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{
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cogl_handle_unref (self->material);
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self->material = COGL_INVALID_HANDLE;
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}
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if (self->screen != NULL)
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{
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ClutterActor *stage = meta_get_stage_for_screen (self->screen);
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g_signal_handlers_disconnect_by_func (stage,
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(gpointer) on_notify_stage_color,
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self);
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self->screen = NULL;
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}
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}
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static void
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@ -165,7 +254,7 @@ meta_background_actor_get_preferred_width (ClutterActor *actor,
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MetaBackgroundActor *self = META_BACKGROUND_ACTOR (actor);
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int width, height;
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meta_screen_get_size (self->screen, &width, &height);
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meta_screen_get_size (self->background->screen, &width, &height);
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if (min_width_p)
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*min_width_p = width;
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@ -183,7 +272,7 @@ meta_background_actor_get_preferred_height (ClutterActor *actor,
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MetaBackgroundActor *self = META_BACKGROUND_ACTOR (actor);
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int width, height;
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meta_screen_get_size (self->screen, &width, &height);
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meta_screen_get_size (self->background->screen, &width, &height);
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if (min_height_p)
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*min_height_p = height;
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@ -198,7 +287,7 @@ meta_background_actor_paint (ClutterActor *actor)
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guchar opacity = clutter_actor_get_paint_opacity (actor);
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int width, height;
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meta_screen_get_size (self->screen, &width, &height);
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meta_screen_get_size (self->background->screen, &width, &height);
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cogl_material_set_color4ub (self->material,
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opacity, opacity, opacity, opacity);
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@ -217,10 +306,10 @@ meta_background_actor_paint (ClutterActor *actor)
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cogl_rectangle_with_texture_coords (rect.x, rect.y,
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rect.x + rect.width, rect.y + rect.height,
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rect.x / self->texture_width,
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rect.y / self->texture_height,
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(rect.x + rect.width) / self->texture_width,
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(rect.y + rect.height) / self->texture_height);
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rect.x / self->background->texture_width,
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rect.y / self->background->texture_height,
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(rect.x + rect.width) / self->background->texture_width,
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(rect.y + rect.height) / self->background->texture_height);
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}
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}
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else
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@ -228,8 +317,8 @@ meta_background_actor_paint (ClutterActor *actor)
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cogl_rectangle_with_texture_coords (0.0f, 0.0f,
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width, height,
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0.0f, 0.0f,
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width / self->texture_width,
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height / self->texture_height);
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width / self->background->texture_width,
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height / self->background->texture_height);
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}
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}
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@ -240,7 +329,7 @@ meta_background_actor_get_paint_volume (ClutterActor *actor,
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MetaBackgroundActor *self = META_BACKGROUND_ACTOR (actor);
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int width, height;
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meta_screen_get_size (self->screen, &width, &height);
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meta_screen_get_size (self->background->screen, &width, &height);
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clutter_paint_volume_set_width (volume, width);
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clutter_paint_volume_set_height (volume, height);
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@ -279,30 +368,25 @@ ClutterActor *
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meta_background_actor_new (MetaScreen *screen)
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{
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MetaBackgroundActor *self;
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ClutterActor *stage;
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g_return_val_if_fail (META_IS_SCREEN (screen), NULL);
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self = g_object_new (META_TYPE_BACKGROUND_ACTOR, NULL);
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self->screen = screen;
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self->background = meta_screen_background_get (screen);
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self->background->actors = g_slist_prepend (self->background->actors, self);
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self->material = meta_create_texture_material (NULL);
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cogl_material_set_layer_wrap_mode (self->material, 0,
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COGL_MATERIAL_WRAP_MODE_REPEAT);
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stage = meta_get_stage_for_screen (self->screen);
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g_signal_connect (stage, "notify::color",
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G_CALLBACK (on_notify_stage_color), self);
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meta_background_actor_update (self);
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set_texture_on_actor (self);
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update_wrap_mode_of_actor (self);
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return CLUTTER_ACTOR (self);
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}
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/**
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* meta_background_actor_update:
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* @self: a #MetaBackgroundActor
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* @screen: a #MetaScreen
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*
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* Refetches the _XROOTPMAP_ID property for the root window and updates
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* the contents of the background actor based on that. There's no attempt
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@ -312,8 +396,9 @@ meta_background_actor_new (MetaScreen *screen)
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* a PropertyNotify event for the property.
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*/
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void
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meta_background_actor_update (MetaBackgroundActor *self)
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meta_background_actor_update (MetaScreen *screen)
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{
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MetaScreenBackground *background;
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MetaDisplay *display;
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MetaCompositor *compositor;
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Atom type;
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@ -323,14 +408,13 @@ meta_background_actor_update (MetaBackgroundActor *self)
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guchar *data;
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Pixmap root_pixmap_id;
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g_return_if_fail (META_IS_BACKGROUND_ACTOR (self));
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display = meta_screen_get_display (self->screen);
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background = meta_screen_background_get (screen);
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display = meta_screen_get_display (screen);
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compositor = meta_display_get_compositor (display);
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root_pixmap_id = None;
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if (!XGetWindowProperty (meta_display_get_xdisplay (display),
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meta_screen_get_xroot (self->screen),
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meta_screen_get_xroot (screen),
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compositor->atom_x_root_pixmap,
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0, LONG_MAX,
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False,
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@ -358,16 +442,16 @@ meta_background_actor_update (MetaBackgroundActor *self)
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if (texture != COGL_INVALID_HANDLE)
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{
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set_texture (self, texture);
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set_texture (background, texture);
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cogl_handle_unref (texture);
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self->have_pixmap = True;
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background->have_pixmap = True;
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return;
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}
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}
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self->have_pixmap = False;
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set_texture_to_stage_color (self);
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background->have_pixmap = False;
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set_texture_to_stage_color (background);
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}
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/**
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@ -394,7 +478,7 @@ meta_background_actor_set_visible_region (MetaBackgroundActor *self,
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if (visible_region)
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{
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cairo_rectangle_int_t screen_rect = { 0 };
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meta_screen_get_size (self->screen, &screen_rect.width, &screen_rect.height);
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meta_screen_get_size (self->background->screen, &screen_rect.width, &screen_rect.height);
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/* Doing the intersection here is probably unnecessary - MetaWindowGroup
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* should never compute a visible area that's larger than the root screen!
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@ -407,13 +491,18 @@ meta_background_actor_set_visible_region (MetaBackgroundActor *self,
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/**
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* meta_background_actor_screen_size_changed:
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* @self: a #MetaBackgroundActor
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* @screen: a #MetaScreen
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*
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* Called by the compositor when the size of the #MetaScreen changes
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*/
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void
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meta_background_actor_screen_size_changed (MetaBackgroundActor *self)
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meta_background_actor_screen_size_changed (MetaScreen *screen)
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{
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update_wrap_mode (self);
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clutter_actor_queue_relayout (CLUTTER_ACTOR (self));
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MetaScreenBackground *background = meta_screen_background_get (screen);
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GSList *l;
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update_wrap_mode (background);
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for (l = background->actors; l; l = l->next)
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clutter_actor_queue_relayout (l->data);
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}
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@ -50,9 +50,10 @@ GType meta_background_actor_get_type (void);
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ClutterActor *meta_background_actor_new (MetaScreen *screen);
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void meta_background_actor_update (MetaBackgroundActor *actor);
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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 */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user