presentation time feedback event More...
#include <wayland-client-protocol-extra.hpp>
Public Types | |
| enum | wrapper_type { wrapper_type::standard, wrapper_type::display, wrapper_type::foreign, wrapper_type::proxy_wrapper } |
Public Member Functions | |
| std::function< void(output_t)> & | on_sync_output () |
| presentation synchronized to this output More... | |
| std::function< void(uint32_t, uint32_t, uint32_t, uint32_t, uint32_t, uint32_t, presentation_feedback_kind)> & | on_presented () |
| the content update was displayed More... | |
| std::function< void()> & | on_discarded () |
| the content update was not displayed More... | |
| uint32_t | get_id () const |
| Get the id of a proxy object. More... | |
| std::string | get_class () const |
| Get the interface name (class) of a proxy object. More... | |
| uint32_t | get_version () const |
| Get the protocol object version of a proxy object. More... | |
| wrapper_type | get_wrapper_type () const |
| Get the type of a proxy object. More... | |
| void | set_queue (event_queue_t queue) |
| Assign a proxy to an event queue. More... | |
| wl_proxy * | c_ptr () const |
| Get a pointer to the underlying C struct. More... | |
| bool | proxy_has_object () const |
| Check whether this wrapper actually wraps an object. More... | |
| operator bool () const | |
| Check whether this wrapper actually wraps an object. More... | |
| bool | operator== (const proxy_t &right) const |
| Check whether two wrappers refer to the same object. More... | |
| bool | operator!= (const proxy_t &right) const |
| Check whether two wrappers refer to different objects. More... | |
| void | proxy_release () |
| Release the wrapped object (if any), making this an empty wrapper. More... | |
Detailed Description
presentation time feedback event
A presentation_feedback object returns an indication that a wl_surface content update has become visible to the user. One object corresponds to one content update submission (wl_surface.commit). There are two possible outcomes: the content update is presented to the user, and a presentation timestamp delivered; or, the user did not see the content update because it was superseded or its surface destroyed, and the content update is discarded.
Once a presentation_feedback object has delivered a 'presented' or 'discarded' event it is automatically destroyed.
Definition at line 186 of file wayland-client-protocol-extra.hpp.
Member Enumeration Documentation
◆ wrapper_type
|
stronginherited |
Underlying wl_proxy type and properties of a proxy_t that affect construction, destruction, and event handling
| Enumerator | |
|---|---|
| standard | C pointer is a standard type compatible with wl_proxy*. Events are dispatched and it is destructed when the proxy_t is destructed. User data is set. |
| display | C pointer is a wl_display*. No events are dispatched, wl_display_disconnect is called when the proxy_t is destructed. User data is set. |
| foreign | C pointer is a standard type compatible with wl_proxy*, but another library owns it and it should not be touched in a way that could affect the operation of the other library. No events are dispatched, wl_proxy_destroy is not called when the proxy_t is destructed, user data is not touched. Consequently, there is no reference counting for the proxy_t. Lifetime of such wrappers should preferably be short to minimize the chance that the owning library decides to destroy the wl_proxy. |
| proxy_wrapper | C pointer is a wl_proxy* that was constructed with wl_proxy_create_wrapper. No events are dispatched, wl_proxy_wrapper_destroy is called when the proxy_t is destroyed. Reference counting is active. A reference to the proxy_t creating this proxy wrapper is held to extend its lifetime until after the proxy wrapper is destroyed. |
Definition at line 105 of file wayland-client.hpp.
Member Function Documentation
◆ c_ptr()
|
inherited |
Get a pointer to the underlying C struct.
- Returns
- The underlying wl_proxy wrapped by this proxy_t if it exists, otherwise an exception is thrown
◆ get_class()
|
inherited |
Get the interface name (class) of a proxy object.
- Returns
- The interface name of the object associated with the proxy
◆ get_id()
|
inherited |
◆ get_version()
|
inherited |
Get the protocol object version of a proxy object.
Gets the protocol object version of a proxy object, or 0 if the proxy was created with unversioned API.
A returned value of 0 means that no version information is available, so the caller must make safe assumptions about the object's real version.
display_t will always return version 0.
- Returns
- The protocol object version of the proxy or 0
◆ get_wrapper_type()
|
inlineinherited |
Get the type of a proxy object.
Definition at line 288 of file wayland-client.hpp.
◆ on_discarded()
| std::function< void()> & presentation_feedback_t::on_discarded | ( | ) |
the content update was not displayed
The content update was never displayed to the user.
Definition at line 747 of file wayland-client-protocol-extra.cpp.
◆ on_presented()
| std::function< void(uint32_t, uint32_t, uint32_t, uint32_t, uint32_t, uint32_t, presentation_feedback_kind)> & presentation_feedback_t::on_presented | ( | ) |
the content update was displayed
- Parameters
-
tv_sec_hi high 32 bits of the seconds part of the presentation timestamp tv_sec_lo low 32 bits of the seconds part of the presentation timestamp tv_nsec nanoseconds part of the presentation timestamp refresh nanoseconds till next refresh seq_hi high 32 bits of refresh counter seq_lo low 32 bits of refresh counter flags combination of 'kind' values
The associated content update was displayed to the user at the indicated time (tv_sec_hi/lo, tv_nsec). For the interpretation of the timestamp, see presentation.clock_id event.
The timestamp corresponds to the time when the content update turned into light the first time on the surface's main output. Compositors may approximate this from the framebuffer flip completion events from the system, and the latency of the physical display path if known.
This event is preceded by all related sync_output events telling which output's refresh cycle the feedback corresponds to, i.e. the main output for the surface. Compositors are recommended to choose the output containing the largest part of the wl_surface, or keeping the output they previously chose. Having a stable presentation output association helps clients predict future output refreshes (vblank).
The 'refresh' argument gives the compositor's prediction of how many nanoseconds after tv_sec, tv_nsec the very next output refresh may occur. This is to further aid clients in predicting future refreshes, i.e., estimating the timestamps targeting the next few vblanks. If such prediction cannot usefully be done, the argument is zero.
If the output does not have a constant refresh rate, explicit video mode switches excluded, then the refresh argument must be zero.
The 64-bit value combined from seq_hi and seq_lo is the value of the output's vertical retrace counter when the content update was first scanned out to the display. This value must be compatible with the definition of MSC in GLX_OML_sync_control specification. Note, that if the display path has a non-zero latency, the time instant specified by this counter may differ from the timestamp's.
If the output does not have a concept of vertical retrace or a refresh cycle, or the output device is self-refreshing without a way to query the refresh count, then the arguments seq_hi and seq_lo must be zero.
Definition at line 742 of file wayland-client-protocol-extra.cpp.
◆ on_sync_output()
| std::function< void(output_t)> & presentation_feedback_t::on_sync_output | ( | ) |
presentation synchronized to this output
- Parameters
-
output presentation output
As presentation can be synchronized to only one output at a time, this event tells which output it was. This event is only sent prior to the presented event.
As clients may bind to the same global wl_output multiple times, this event is sent for each bound instance that matches the synchronized output. If a client has not bound to the right wl_output global at all, this event is not sent.
Definition at line 737 of file wayland-client-protocol-extra.cpp.
◆ operator bool()
|
inherited |
Check whether this wrapper actually wraps an object.
- Returns
- true if there is an underlying object, false if this wrapper is empty
◆ operator!=()
|
inherited |
Check whether two wrappers refer to different objects.
◆ operator==()
|
inherited |
Check whether two wrappers refer to the same object.
◆ proxy_has_object()
|
inherited |
Check whether this wrapper actually wraps an object.
- Returns
- true if there is an underlying object, false if this wrapper is empty
◆ proxy_release()
|
inherited |
Release the wrapped object (if any), making this an empty wrapper.
Note that display_t instances cannot be released this way. Attempts to do so are ignored.
- Examples
- foreign_display.cpp.
◆ set_queue()
|
inherited |
Assign a proxy to an event queue.
- Parameters
-
queue The event queue that will handle this proxy
Assign proxy to event queue. Events coming from proxy will be queued in queue instead of the display's main queue.
See also: display_t::dispatch_queue().
- Examples
- proxy_wrapper.cpp.
The documentation for this class was generated from the following files:
