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ChuckandClaude Opus 5
2622c15265
The hold applied in configure() never reached the panel. Plugins share one
display manager, and set_scrolling_state(False) -- fired whenever ANY other
plugin finishes its scroll -- reset the hold to 1. A hold set once at plugin
construction was therefore always gone by the time that plugin rendered.
The symptom was a log line that lied. ledmatrix-stocks reported
Scroll configured: 50.0 px/s (1px every 2 refreshes = 50.0 fps, smooth)
while the panel measured 100.0 fps, median 10.00ms. Config, resolution and
snapping were all correct; only the pacing silently was not applied.
set_scrolling_state(is_scrolling, frame_hold=1) now carries it, so the hold
lives exactly as long as the scroll that asked for it. configure() reports the
value as ScrollSettings.frame_hold instead of applying it -- applying it behind
the caller's back could never have been right on a shared display manager.
Existing callers are unaffected; the default keeps one frame per refresh.
Verified on hardware: stocks at 50 px/s now measures
50.0 fps over 251 frames | median 20.00ms p95 20.09ms | stalls 0 skips 0
20.00ms being exactly two refreshes, with the panel still refreshing at 100Hz
underneath so flicker is unchanged.
test_another_plugin_stopping_does_not_strand_a_hold pins the interaction that
broke this.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
315 lines
12 KiB
Python
315 lines
12 KiB
Python
"""Tests for update_display dirty tracking (src/display_manager.py).
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Runs against RGBMatrixEmulator (EMULATOR=true), exercising the REAL
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DisplayManager — not a mock — so the skip logic, its invalidation hooks,
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and the kill switch are verified off-Pi.
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The invariants:
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- identical frames are pushed exactly once (SwapOnVSync not re-called)
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- ANY pixel change pushes
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- clear() and set_brightness() invalidate (the two paths that alter panel
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state outside the digest's view)
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- the kill switch (display.dirty_tracking: false) restores always-push
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"""
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import os
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import sys
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import time
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os.environ["EMULATOR"] = "true"
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import pytest
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sys.path.insert(0, os.path.join(os.path.dirname(__file__), ".."))
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@pytest.fixture(scope="module")
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def dm():
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"""One real DisplayManager on the emulator (it's a process singleton)."""
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from src.display_manager import DisplayManager
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DisplayManager._instance = None
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DisplayManager._initialized = False
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manager = DisplayManager({
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"display": {
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"hardware": {"rows": 32, "cols": 64, "chain_length": 2,
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"parallel": 1, "brightness": 90},
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"runtime": {"gpio_slowdown": 0},
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},
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}, suppress_test_pattern=True)
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yield manager
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DisplayManager._instance = None
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DisplayManager._initialized = False
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class _SwapSpy:
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"""Counts SwapOnVSync calls through the real matrix object."""
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def __init__(self, matrix):
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self.matrix = matrix
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self.count = 0
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self.last_frame_hold = None
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self._orig = matrix.SwapOnVSync
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def __enter__(self):
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def counting(canvas, *args):
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# *args carries framerate_fraction, which display_manager passes so
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# a frame can be held for several refreshes. Signature must match
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# the real binding or the spy hides a TypeError as a failed push.
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self.count += 1
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self.last_frame_hold = args[0] if args else 1
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return self._orig(canvas, *args)
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self.matrix.SwapOnVSync = counting
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return self
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def __exit__(self, *exc):
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self.matrix.SwapOnVSync = self._orig
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class TestDirtyTracking:
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def test_identical_frames_push_once(self, dm):
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dm.draw.rectangle([0, 0, 10, 10], fill=(255, 0, 0))
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with _SwapSpy(dm.matrix) as spy:
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dm.update_display()
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dm.update_display()
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dm.update_display()
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assert spy.count == 1
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def test_pixel_change_pushes(self, dm):
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dm.update_display()
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with _SwapSpy(dm.matrix) as spy:
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dm.draw.point((5, 5), fill=(0, 255, 0))
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dm.update_display()
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dm.update_display() # unchanged again
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assert spy.count == 1
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def test_clear_invalidates(self, dm):
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dm.draw.rectangle([0, 0, 20, 20], fill=(0, 0, 255))
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dm.update_display()
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dm.clear() # writes to the matrix directly; digest must reset
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with _SwapSpy(dm.matrix) as spy:
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dm.update_display() # black frame after clear must still push
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assert spy.count == 1
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def test_brightness_change_forces_push(self, dm):
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dm.draw.rectangle([0, 0, 20, 20], fill=(200, 200, 200))
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dm.update_display()
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with _SwapSpy(dm.matrix) as spy:
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dm.update_display() # identical -> skipped
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assert spy.count == 0
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dm.set_brightness(40) # dim schedule scenario
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dm.update_display() # same image, new brightness -> push
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assert spy.count == 1
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dm.set_brightness(90)
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def test_snapshot_still_written_on_skip(self, dm, tmp_path):
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"""The web preview mirror must keep working through skipped panel
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pushes: _write_snapshot_if_due() still runs on the dirty-tracking
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skip path and applies its own write/touch policy rather than being
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bypassed entirely (see src/common/snapshot_policy.py — an unchanged
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frame is touched, not re-encoded, once TOUCH_INTERVAL elapses)."""
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dm._snapshot_path = str(tmp_path / "snap.png")
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dm._last_snapshot_ts = 0.0
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dm._last_snapshot_touch_ts = 0.0
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dm._last_snapshot_digest = None
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dm.draw.rectangle([0, 0, 30, 8], fill=(255, 255, 0))
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dm.update_display() # push + snapshot write (first frame)
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assert os.path.exists(dm._snapshot_path)
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# Backdate the file so the "was it bumped?" check below cannot be
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# defeated by filesystem mtime granularity -- on Windows two writes in
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# the same tick get identical timestamps, which made this test fail
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# roughly two runs in three regardless of the code under test.
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os.utime(dm._snapshot_path, (time.time() - 60, time.time() - 60))
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first_mtime = os.path.getmtime(dm._snapshot_path)
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# Age the write/touch bookkeeping past TOUCH_INTERVAL so the next
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# identical frame is due for a touch, then push it again: dirty
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# tracking must skip the panel write, but the snapshot mirror must
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# still get its mtime bumped so the health check doesn't go stale.
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from src.common import snapshot_policy
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stale_ts = time.time() - snapshot_policy.TOUCH_INTERVAL - 1.0
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dm._last_snapshot_ts = stale_ts
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dm._last_snapshot_touch_ts = stale_ts
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with _SwapSpy(dm.matrix) as spy:
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dm.update_display() # identical frame -> panel push skipped
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assert spy.count == 0
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assert os.path.getmtime(dm._snapshot_path) > first_mtime
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class TestScrollLock:
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"""Dirty tracking must not skip the panel push while a scroll is running.
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SwapOnVSync is what paces the render loop, so skipping it also skips the
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wait for the panel. A duplicate frame therefore returns early -- ~8ms
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instead of ~10ms on a 100Hz panel -- which advances the strip only 0.8px
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instead of 1.0px, which makes the NEXT frame more likely to be a duplicate
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too. That is self-sustaining: measured at ~20% duplicate frames mid-scroll
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on the odds ticker against essentially zero on a lighter plugin with
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identical scroll settings. Pushing an identical frame costs one canvas
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copy; falling out of vsync lock costs smooth motion.
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"""
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def test_identical_frames_still_push_while_scrolling(self, dm):
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dm.draw.rectangle([0, 0, 12, 12], fill=(0, 0, 255))
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dm.update_display()
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dm.set_scrolling_state(True)
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try:
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with _SwapSpy(dm.matrix) as spy:
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dm.update_display()
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dm.update_display()
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dm.update_display()
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assert spy.count == 3, "scrolling must stay locked to the panel"
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finally:
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dm.set_scrolling_state(False)
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def test_identical_frames_are_skipped_when_not_scrolling(self, dm):
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"""The optimisation still applies to static content."""
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dm.set_scrolling_state(False)
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dm.draw.rectangle([0, 0, 14, 14], fill=(255, 0, 255))
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dm.update_display()
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with _SwapSpy(dm.matrix) as spy:
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dm.update_display()
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dm.update_display()
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assert spy.count == 0
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def test_stale_scrolling_state_stops_forcing_pushes(self, dm):
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"""A plugin that stops scrolling without saying so must not pin the
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panel into always-push forever. is_currently_scrolling() expires on
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its own inactivity threshold, and the skip has to come back with it."""
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dm.draw.rectangle([0, 0, 16, 16], fill=(0, 255, 255))
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dm.update_display()
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dm.set_scrolling_state(True)
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try:
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# Backdate the activity marker past the inactivity threshold.
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dm._scrolling_state['last_scroll_activity'] = (
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time.time() - dm._scrolling_state['scroll_inactivity_threshold'] - 1.0)
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assert dm.is_currently_scrolling() is False
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with _SwapSpy(dm.matrix) as spy:
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dm.update_display()
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dm.update_display()
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assert spy.count == 0
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finally:
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dm.set_scrolling_state(False)
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class TestKillSwitch:
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def test_dirty_tracking_can_be_disabled(self, dm):
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dm._dirty_tracking_enabled = False
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try:
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dm.draw.rectangle([0, 0, 10, 10], fill=(1, 2, 3))
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with _SwapSpy(dm.matrix) as spy:
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dm.update_display()
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dm.update_display()
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dm.update_display()
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assert spy.count == 3 # always-push, exactly the old behavior
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finally:
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dm._dirty_tracking_enabled = True
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dm._last_pushed_digest = None
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def test_config_flag_wires_through(self):
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from src.display_manager import DisplayManager
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DisplayManager._instance = None
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DisplayManager._initialized = False
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try:
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manager = DisplayManager({
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"display": {
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"hardware": {"rows": 32, "cols": 64, "chain_length": 1,
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"parallel": 1},
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"runtime": {"gpio_slowdown": 0},
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"dirty_tracking": False,
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},
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}, suppress_test_pattern=True)
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assert manager._dirty_tracking_enabled is False
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finally:
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DisplayManager._instance = None
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DisplayManager._initialized = False
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if __name__ == "__main__":
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sys.exit(pytest.main([__file__, "-v"]))
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class TestFrameHold:
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"""Holding a frame for N refreshes is how a scroll runs slower than one
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pixel per refresh without fractional pixel positions."""
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def test_hold_reaches_swap_on_vsync(self, dm):
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dm.set_scrolling_state(True)
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dm.set_frame_hold(3)
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try:
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dm.draw.rectangle([0, 0, 9, 9], fill=(120, 0, 200))
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with _SwapSpy(dm.matrix) as spy:
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dm.update_display()
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assert spy.count == 1
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assert spy.last_frame_hold == 3
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finally:
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dm.set_scrolling_state(False)
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def test_default_is_every_refresh(self, dm):
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dm.set_scrolling_state(True)
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try:
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dm.draw.rectangle([0, 0, 11, 11], fill=(0, 120, 200))
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with _SwapSpy(dm.matrix) as spy:
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dm.update_display()
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assert spy.last_frame_hold == 1
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finally:
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dm.set_scrolling_state(False)
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def test_hold_resets_when_scrolling_stops(self, dm):
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"""One plugin's pacing must not leak into whatever is on screen next."""
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dm.set_scrolling_state(True)
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dm.set_frame_hold(5)
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dm.set_scrolling_state(False)
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dm.set_scrolling_state(True)
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try:
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dm.draw.rectangle([0, 0, 13, 13], fill=(200, 120, 0))
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with _SwapSpy(dm.matrix) as spy:
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dm.update_display()
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assert spy.last_frame_hold == 1
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finally:
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dm.set_scrolling_state(False)
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@pytest.mark.parametrize("bad,expected", [(0, 1), (-4, 1), (None, 1), ("x", 1)])
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def test_unusable_holds_are_ignored_or_floored(self, dm, bad, expected):
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dm.set_frame_hold(bad)
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assert dm._frame_hold == expected
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class TestFrameHoldLifetime:
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"""The hold must last exactly as long as the scroll that asked for it.
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Plugins share one display manager. A hold applied at plugin construction is
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wiped the moment any *other* plugin finishes scrolling, so by the time the
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first plugin renders it is back to one pixel per refresh -- the speed reads
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correct in the log and is wrong on the panel.
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"""
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def test_scrolling_state_carries_the_hold(self, dm):
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dm.set_scrolling_state(True, frame_hold=4)
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try:
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dm.draw.rectangle([0, 0, 7, 7], fill=(10, 200, 10))
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with _SwapSpy(dm.matrix) as spy:
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dm.update_display()
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assert spy.last_frame_hold == 4
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finally:
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dm.set_scrolling_state(False)
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def test_another_plugin_stopping_does_not_strand_a_hold(self, dm):
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dm.set_scrolling_state(True, frame_hold=3)
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dm.set_scrolling_state(False) # some other plugin finishes
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dm.set_scrolling_state(True) # a plugin that wants no hold
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try:
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dm.draw.rectangle([0, 0, 6, 6], fill=(200, 10, 10))
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with _SwapSpy(dm.matrix) as spy:
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dm.update_display()
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assert spy.last_frame_hold == 1
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finally:
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dm.set_scrolling_state(False)
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def test_default_keeps_previous_behaviour(self, dm):
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"""Callers that never heard of frame holds get one frame per refresh."""
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dm.set_scrolling_state(True)
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try:
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assert dm._frame_hold == 1
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finally:
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dm.set_scrolling_state(False)
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