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Bug 1511901 - Fix device name comparison in TouchDeviceNeedsPanGestureConversion(). r=cmartin

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Differential Revision: https://phabricator.services.mozilla.com/D45113

--HG--
extra : moz-landing-system : lando
This commit is contained in:
Botond Ballo 2019-09-30 19:43:35 +00:00
parent 9651ff76cf
commit 619c1645b2
1 changed files with 8 additions and 1 deletions
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9
widget/windows/nsWindow.cpp
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@ -6724,7 +6724,14 @@ bool TouchDeviceNeedsPanGestureConversion(PTOUCHINPUT aOSEvent,
}
// The affected device name is "\\?\VIRTUAL_DIGITIZER", but each backslash
// needs to be escaped with another one.
if (deviceName != "\\\\?\\VIRTUAL_DIGITIZER") {
std::string expectedDeviceName = "\\\\?\\VIRTUAL_DIGITIZER";
// For some reason, the dataSize returned by the first call is double the
// actual length of the device name (as if it were returning the size of a
// wide-character string in bytes) even though we are using the narrow
// version of the API. For the comparison against the expected device name
// to pass, we truncate the buffer to be no longer tha the expected device
// name.
if (deviceName.substr(0, expectedDeviceName.length()) != expectedDeviceName) {
return false;
}