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38 lines
1.4 KiB
Diff
38 lines
1.4 KiB
Diff
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From 5ade494a9966c7a9675af86dc42aca62fb4d806d Mon Sep 17 00:00:00 2001
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From: Tom Anderson <thomasanderson@chromium.org>
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Date: Wed, 21 Oct 2020 22:02:35 +0000
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Subject: [PATCH] [XProto] Fix underflow in Fp1616ToDouble
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x11::Input::Fp1616 should be treated as a signed integer, otherwise
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-1 will underflow to 65535. When dragging a scrollbar, this would
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cause the scrollbar to snap to the bottom when the cursor is dragged
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above the window's y=0 coordinate. Verified that the issue is fixed
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after this CL.
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BUG=1139623,1136352
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R=sky
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Change-Id: Ie318006ceadde9b9ce3e267fb453ddeba0e81da0
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Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2485620
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Auto-Submit: Thomas Anderson <thomasanderson@chromium.org>
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Commit-Queue: Scott Violet <sky@chromium.org>
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Reviewed-by: Scott Violet <sky@chromium.org>
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Cr-Commit-Position: refs/heads/master@{#819538}
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---
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ui/events/x/events_x_utils.cc | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/ui/events/x/events_x_utils.cc b/ui/events/x/events_x_utils.cc
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index 3010db5f40c..856dfb221e7 100644
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--- a/ui/events/x/events_x_utils.cc
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+++ b/ui/events/x/events_x_utils.cc
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@@ -376,7 +376,7 @@ base::TimeTicks TimeTicksFromXEvent(const x11::Event& xev) {
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// This is ported from libxi's FP1616toDBL in XExtInt.c
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double Fp1616ToDouble(x11::Input::Fp1616 x) {
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- auto x32 = static_cast<uint32_t>(x);
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+ auto x32 = static_cast<int32_t>(x);
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return x32 * 1.0 / (1 << 16);
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}
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