Add an API to start or stop continually updating the frame clock.
This is a slight convenience for applcations and avoids the problem
of getting one more frame run after an animation stops, but the
primary motivation for this is because it looks like we might have
to use timeBeginPeriod()/timeEndPeriod() on Windows to get reasonably
accurate timing, and for that we'll need to know if there is an
animation running.
https://bugzilla.gnome.org/show_bug.cgi?id=693934
* remove gdk_frame_clock_get_frame_time_val(); a convenience
function that would rarely be used.
* remove gdk_frame_clock_get_requested() and
::frame-requested signal; while we might want to eventually
be able to track the requested phases for a clock, we don't
have a current use case.
* Make gdk_frame_clock_freeze/thaw() private: they are only
used within GTK+ and have complex semantics.
* Remove gdk_frame_clock_get_last_complete(). Another convenience
function that I don't have a current use case for.
* Rename:
gdk_frame_clock_get_start() => gdk_frame_clock_get_history_start()
gdk_frame_clocK_get_current_frame_timings() => gdk_frame_clock_get_timings()
Now that GdkFrameClock is a class, not interface, there's no real advantage
to splitting the frame history into an aggregate object, so directly
merge it into GdkFrameClock.
Add a very simple GtkWidget function for an "tick" callback, which
is connected to the ::update signal of GdkFrameClock.
Remove:
- GtkTimeline. The consensus is that it is too complex.
- GdkPaintClockTarget. In the rare cases where tick callbacks
aren't sufficient, it's possible to track the
paint clock with ::realize/::unrealize/::hierarchy-changed.
GtkTimeline is kept using ::update directly to allow using a GtkTimeline
with a paint clock but no widget.
The first version of the video-timer simply played back the video
according to the wall clock, and showed each frame at the neareste
presentatin time. But an alternative strategy for playing back
video is that if the frame-rate is an integer-divisor of the
display refresh rate, or very close to that, is to change the playback
speed to complete avoid frame drops and changes in latency.
(This would require resampling audio if present.)
Demonstrate this technique by adding a --pll option to the
video-timer demo.
https://bugzilla.gnome.org/show_bug.cgi?id=685460
Add a test case that simulates the timing operaton that goes on
when showing a constant frame rate stream like a video - each
frame is shown at the VBlank interval that is closest to when it
would ideally be timed.
https://bugzilla.gnome.org/show_bug.cgi?id=685460
Show the average and standard deviation of the latency in addition to
the frame rate. Add options to print the output in machine-readable form,
and to control the frequency and total number of statistics that will be
output.
https://bugzilla.gnome.org/show_bug.cgi?id=685460
When we have pending motion events, instead of delivering them
directly, request the new FLUSH_EVENTS phase of the frame clock.
This allows us to compress repeated motion events sent to the
same window.
In the FLUSH_EVENTS phase, which occur at priority GDK_PRIORITY_EVENTS + 1,
we deliver any pending motion events then turn off event delivery
until the end of the next frame. Turning off event delivery means
that we'll reliably paint the compressed motion events even if more
have arrived.
Add a motion-compression test case which demonstrates behavior when
an application takes too long handle motion events. It is unusable
without this patch but behaves fine with the patch.
https://bugzilla.gnome.org/show_bug.cgi?id=685460
Add a test of a window with an animated size and contents. The
test accepts load factor command line argument to see how things
work as the drawing of the content requires more GPU resources.
https://bugzilla.gnome.org/show_bug.cgi?id=685460
width-chars and max-width chars should (and do) only change the
requested sizes, not the allocated size of the label.
This came out of an IRC discussion, so no bug.
This is a trivial example. Just check that we can derive
from GtkButtonAccessible, and have a GtkButton subclass
use the derived accessible implementation.
The new css tree may change the order of selectors (keeping the
same semantics). This affects how the selectors are printed later,
which causes some css parsing tests to not match the references.
Fortunately the order is consistent between runs given the same
css, so we just have to switch around the order in some of the
.ref.css files.
Make it so that the repeating vs normal test only uses sharp color
cutoffs instead of real gradients. That removes rounding errors and
makes the test pass.
Expose GtkEntry icons as child accessibles of a GtkEntry, and provide
actions to simulate clicking them. Also, refactor the a11y children test
slightly to add a test.
https://bugzilla.gnome.org/show_bug.cgi?id=686347
