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78fd84c0b5
We've run this on laptops in postmarketOS for a very long while, without remarkable issues. This greatly helps in performance with slow devices (e.g: SoCs and phones), and wont get accepted upstream due to it being in feature freeze, and requiring more extensive changes to input to not be "just a hack". This seems, however, a sensible patch downstream for an old version of the project
79 lines
2.7 KiB
Diff
79 lines
2.7 KiB
Diff
From: Alexander Mikhaylenko <alexm@gnome.org>
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Date: Thu, 3 Dec 2020 14:42:23 +0500
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Subject: events: Compress touch update events
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GTK3 often moves child windows around in response to touch gestures, such
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as scrolling or swipes. This leads to a problem when a frame has multiple
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events whose coordinates are relative to the window: the first event moves
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the window, then the second event has wrong coordinates. This leads to a
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severe jumping when scrolling or swiping when the system slows down.
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GTK4 fixes this by getting rid of child windows completely, but for GTK3
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we have to work around this by compressing touch update events. This isn't
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really suitable for upstream, but wouldn't be the worst patch we have
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downstream.
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See https://source.puri.sm/Librem5/debs/gtk/-/issues/8
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---
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Pablo Correa Gomez comment: we've run this on laptops in postmarketOS for
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a very long while, without remarkable issues. This greatly helps in performance
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with slow devices (e.g: SoCs and phones), and wont get accepted upstream
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due to it being in feature freeze, and requiring more extensive changes to
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input to not be "just a hack". This seems, however, a sensible patch downstream
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for an old version of the project
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gdk/gdkevents.c | 18 ++++++++++++------
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1 file changed, 12 insertions(+), 6 deletions(-)
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--- a/gdk/gdkevents.c
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+++ b/gdk/gdkevents.c
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@@ -268,30 +268,36 @@
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while (tmp_list)
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{
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GdkEventPrivate *event = tmp_list->data;
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+ GdkWindow *window;
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+ GdkDevice *device;
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if (event->flags & GDK_EVENT_PENDING)
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break;
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- if (event->event.type != GDK_MOTION_NOTIFY)
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+ if (event->event.type != GDK_MOTION_NOTIFY &&
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+ event->event.type != GDK_TOUCH_UPDATE)
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break;
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+ window = gdk_event_get_window (&event->event);
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+ device = gdk_event_get_device (&event->event);
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+
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if (pending_motion_window != NULL &&
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- pending_motion_window != event->event.motion.window)
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+ pending_motion_window != window)
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break;
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if (pending_motion_device != NULL &&
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- pending_motion_device != event->event.motion.device)
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+ pending_motion_device != device)
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break;
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- pending_motion_window = event->event.motion.window;
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+ pending_motion_window = window;
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- if (!event->event.motion.window->event_compression)
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+ if (!window->event_compression)
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{
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uncompressed_motion = TRUE;
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break;
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}
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- pending_motion_device = event->event.motion.device;
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+ pending_motion_device = device;
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pending_motions = tmp_list;
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tmp_list = tmp_list->prev;
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@@ -2578,4 +2584,4 @@
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private = (GdkEventPrivate *) event;
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return private->key_scancode;
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-}
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\ No newline at end of file
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+}
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