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b248941af5
New experimental API is added to allow changing the way that redraws are timed for a stage to include a "sync delay" - a period after the vertical blanking period where Clutter simply waits for updates. In detail, the algorithm is that when the master clock is restarted after drawing a frame (in the case where there are timelines running) or started fresh in response to a queued redraw or relayout, the start is scheduled at the next sync point (sync_delay ms after the predicted vblank period) rather than done immediately. https://bugzilla.gnome.org/show_bug.cgi?id=692901
74 lines
2.1 KiB
C
74 lines
2.1 KiB
C
#ifndef __CLUTTER_STAGE_COGL_H__
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#define __CLUTTER_STAGE_COGL_H__
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#include <cairo.h>
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#include <clutter/clutter-backend.h>
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#include <clutter/clutter-stage.h>
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#ifdef COGL_HAS_X11_SUPPORT
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#include <X11/Xlib.h>
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#include <X11/Xatom.h>
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#include <X11/Xutil.h>
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#endif
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G_BEGIN_DECLS
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#define CLUTTER_TYPE_STAGE_COGL (_clutter_stage_cogl_get_type ())
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#define CLUTTER_STAGE_COGL(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_STAGE_COGL, ClutterStageCogl))
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#define CLUTTER_IS_STAGE_COGL(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CLUTTER_TYPE_STAGE_COGL))
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#define CLUTTER_STAGE_COGL_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), CLUTTER_TYPE_STAGE_COGL, ClutterStageCoglClass))
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#define CLUTTER_IS_STAGE_COGL_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), CLUTTER_TYPE_STAGE_COGL))
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#define CLUTTER_STAGE_COGL_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), CLUTTER_TYPE_STAGE_COGL, ClutterStageCoglClass))
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typedef struct _ClutterStageCogl ClutterStageCogl;
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typedef struct _ClutterStageCoglClass ClutterStageCoglClass;
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struct _ClutterStageCogl
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{
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GObject parent_instance;
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/* the stage wrapper */
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ClutterStage *wrapper;
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/* back pointer to the backend */
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ClutterBackend *backend;
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CoglOnscreen *onscreen;
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gint64 last_presentation_time;
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float refresh_rate;
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gint64 update_time;
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gint pending_swaps;
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CoglFrameClosure *frame_closure;
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/* We only enable clipped redraws after 2 frames, since we've seen
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* a lot of drivers can struggle to get going and may output some
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* junk frames to start with. */
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unsigned long frame_count;
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cairo_rectangle_int_t bounding_redraw_clip;
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guint initialized_redraw_clip : 1;
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/* TRUE if the current paint cycle has a clipped redraw. In that
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case bounding_redraw_clip specifies the the bounds. */
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guint using_clipped_redraw : 1;
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guint dirty_backbuffer : 1;
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/* Stores a list of previous damaged areas */
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GSList *damage_history;
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};
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struct _ClutterStageCoglClass
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{
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GObjectClass parent_class;
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};
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GType _clutter_stage_cogl_get_type (void) G_GNUC_CONST;
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G_END_DECLS
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#endif /* __CLUTTER_STAGE_COGL_H__ */
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