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tests/clutter/frame-clock-timeline: Loosen duration testing

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The final tick of a timeline is >= its duration, but when using ticks that
are slightly in the future ("next presentation time") this means the final
tick will execute and complete the timeline up to one frame interval before
the timestamp of that final tick.

For the single clock test we now just check if the overall duration is
within one frame of the expected timeline duration.

The dual clock (switching) test needs a threshold of two frames because
starting each new clock creates a phase shift (error) of up to one frame.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2161>
This commit is contained in:
Daniel van Vugt 2021-12-15 15:51:12 +08:00 committed by Marge Bot
parent db0d7202c3
commit f5498950d3
1 changed files with 16 additions and 6 deletions
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22
src/tests/clutter/conform/frame-clock-timeline.c
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@ -2,6 +2,7 @@
#include "tests/clutter-test-utils.h"
static const float refresh_rate = 60.0;
static const int64_t refresh_interval_us = G_USEC_PER_SEC / refresh_rate;
static ClutterFrameResult
timeline_frame_clock_frame (ClutterFrameClock *frame_clock,
@ -61,6 +62,8 @@ frame_clock_timeline_basic (void)
int frame_counter;
int64_t before_us;
int64_t after_us;
int64_t duration_us;
int64_t lateness_us;
main_loop = g_main_loop_new (NULL, FALSE);
frame_clock = clutter_frame_clock_new (refresh_rate,
@ -97,10 +100,10 @@ frame_clock_timeline_basic (void)
g_main_loop_run (main_loop);
after_us = g_get_monotonic_time ();
duration_us = after_us - before_us;
lateness_us = duration_us - ms2us (clutter_timeline_get_duration (timeline));
g_assert_cmpint (after_us - before_us,
>=,
ms2us (clutter_timeline_get_duration (timeline)));
g_assert_cmpint (lateness_us, >, -refresh_interval_us);
g_assert_true (marker1_reached);
@ -140,6 +143,8 @@ frame_clock_timeline_switch (void)
int frame_counter;
int64_t before_us;
int64_t after_us;
int64_t duration_us;
int64_t lateness_us;
main_loop = g_main_loop_new (NULL, FALSE);
@ -181,10 +186,15 @@ frame_clock_timeline_switch (void)
g_main_loop_run (main_loop);
after_us = g_get_monotonic_time ();
duration_us = after_us - before_us;
lateness_us = duration_us - ms2us (clutter_timeline_get_duration (timeline));
g_assert_cmpint (after_us - before_us,
>=,
ms2us (clutter_timeline_get_duration (timeline)));
/* Our threshold is two frames. This is because switching a timeline to a
* new clock of the same frequency shifts the phase up to one frame. And
* this timeline has seen two different clocks so its overall duration may
* be out by almost two frames. But more than two frames is a bug.
*/
g_assert_cmpint (lateness_us, >, -2 * refresh_interval_us);
g_assert (clutter_timeline_get_frame_clock (timeline) == frame_clock2);