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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:24:48 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:24:48 +0000 |
commit | cca66b9ec4e494c1d919bff0f71a820d8afab1fa (patch) | |
tree | 146f39ded1c938019e1ed42d30923c2ac9e86789 /src/debug/gdk-event-latency-tracker.cpp | |
parent | Initial commit. (diff) | |
download | inkscape-cca66b9ec4e494c1d919bff0f71a820d8afab1fa.tar.xz inkscape-cca66b9ec4e494c1d919bff0f71a820d8afab1fa.zip |
Adding upstream version 1.2.2.upstream/1.2.2upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/debug/gdk-event-latency-tracker.cpp | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/src/debug/gdk-event-latency-tracker.cpp b/src/debug/gdk-event-latency-tracker.cpp new file mode 100644 index 0000000..db93912 --- /dev/null +++ b/src/debug/gdk-event-latency-tracker.cpp @@ -0,0 +1,81 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Inkscape::Debug::GdkEventLatencyTracker - tracks backlog of GDK events + * + * Authors: + * MenTaLguY <mental@rydia.net> + * + * Copyright (C) 2008 MenTaLguY + * + * Released under GNU GPL v2+, read the file 'COPYING' for more information. + */ + +#include <gdk/gdk.h> + +#include "debug/gdk-event-latency-tracker.h" +#include "preferences.h" + +namespace Inkscape { +namespace Debug { + +GdkEventLatencyTracker::GdkEventLatencyTracker() + : start_seconds(0.0), max_latency(0.0), skew(1.0), last_elapsed(0.0), last_seconds(0.0) +{ + elapsed.stop(); + elapsed.reset(); +} + +std::optional<double> GdkEventLatencyTracker::process(GdkEvent const *event) { + guint32 const timestamp=gdk_event_get_time(const_cast<GdkEvent *>(event)); + if (timestamp == GDK_CURRENT_TIME) { + return std::optional<double>(); + } + double const timestamp_seconds = timestamp / 1000.0; + + if (start_seconds == 0.0) { + elapsed.start(); + start_seconds = timestamp_seconds; + Inkscape::Preferences *prefs = Inkscape::Preferences::get(); + skew = prefs->getDoubleLimited("/debug/latency/skew", 1.0, 0.5, 2.0); + return std::optional<double>(0.0); + } else { + last_elapsed = elapsed.elapsed(); + last_seconds = timestamp_seconds; + double const current_seconds = (last_elapsed * skew) + start_seconds; + double delta = current_seconds - timestamp_seconds; + if (delta < 0.0) { + start_seconds += -delta; + delta = 0.0; + } else if (delta > max_latency) { + max_latency = delta; + } + return std::optional<double>(delta); + } +} + +double GdkEventLatencyTracker::getSkew() { + double val = 0.0; + if ((last_elapsed > 0.0) && (last_seconds > 0.0)) { + val = (last_seconds - start_seconds) / last_elapsed; + } + return val; +} + +GdkEventLatencyTracker &GdkEventLatencyTracker::default_tracker() { + static GdkEventLatencyTracker tracker; + return tracker; +} + +} +} + +/* + Local Variables: + mode:c++ + c-file-style:"stroustrup" + c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +)) + indent-tabs-mode:nil + fill-column:99 + End: +*/ +// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 : |