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Throttle cursor redrawing in outputStream.cpp (#10394)

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Try to throttle the cursor redrawing in the conhost world.

The motivation of this is the high CPU usage of `TriggerRedrawCursor` (#10393).

This can be seen as the conhost version of #2960.

This saves 5%~8% of the CPU time.

Supports #10462.
This commit is contained in:
Chester Liu 2021-06-29 05:08:22 +08:00 committed by GitHub
parent 51e1ae3e8a
commit 4fc283f8b6
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1 changed files with 9 additions and 1 deletions
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10
src/host/outputStream.cpp
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@ -76,8 +76,15 @@ void WriteBuffer::_DefaultStringCase(const std::wstring_view string)
{
size_t dwNumBytes = string.size() * sizeof(wchar_t);
_io.GetActiveOutputBuffer().GetTextBuffer().GetCursor().SetIsOn(true);
Cursor& cursor = _io.GetActiveOutputBuffer().GetTextBuffer().GetCursor();
if (!cursor.IsOn())
{
cursor.SetIsOn(true);
}
// Defer the cursor drawing while we are iterating the string, for a better performance.
// We can not waste time displaying a cursor event when we know more text is coming right behind it.
cursor.StartDeferDrawing();
_ntstatus = WriteCharsLegacy(_io.GetActiveOutputBuffer(),
string.data(),
string.data(),
@ -87,6 +94,7 @@ void WriteBuffer::_DefaultStringCase(const std::wstring_view string)
_io.GetActiveOutputBuffer().GetTextBuffer().GetCursor().GetPosition().X,
WC_LIMIT_BACKSPACE | WC_DELAY_EOL_WRAP,
nullptr);
cursor.EndDeferDrawing();
}
ConhostInternalGetSet::ConhostInternalGetSet(_In_ IIoProvider& io) :