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Properly limit mouse moves to once every 17 ms

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Previous attempt in c958269 had a number of issues, this is a full
rewrite, complete with improved unit tests.

Fixes github issue #1402
This commit is contained in:
Samuel Mannehed
2020-05-09 20:03:06 +02:00
committed by Lauri Kasanen
parent 8a8fa1d906
commit 19c473f792
4 changed files with 165 additions and 125 deletions
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69
kasmweb/core/rfb.js
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@@ -40,6 +40,9 @@ const DEFAULT_BACKGROUND = 'rgb(40, 40, 40)';
var _videoQuality = 2;
var _enableWebP = false;
// Minimum wait (ms) between two mouse moves
const MOUSE_MOVE_DELAY = 17;
// Extended clipboard pseudo-encoding formats
const extendedClipboardFormatText = 1;
/*eslint-disable no-unused-vars */
@@ -138,6 +141,7 @@ export default class RFB extends EventTargetMixin {
// Timers
this._disconnTimer = null; // disconnection timer
this._resizeTimeout = null; // resize rate limiting
this._mouseMoveTimer = null;
// Decoder states
this._decoders = {};
@@ -152,7 +156,9 @@ export default class RFB extends EventTargetMixin {
};
// Mouse state
this._mousePos = {};
this._mouseButtonMask = 0;
this._mouseLastMoveTime = 0;
this._viewportDragging = false;
this._viewportDragPos = {};
this._viewportHasMoved = false;
@@ -564,6 +570,7 @@ export default class RFB extends EventTargetMixin {
}
}
clearTimeout(this._resizeTimeout);
clearTimeout(this._mouseMoveTimer);
Log.Debug("<< RFB.disconnect");
}
@@ -880,12 +887,6 @@ export default class RFB extends EventTargetMixin {
}
_handleMouseButton(x, y, down, bmask) {
if (down) {
this._mouseButtonMask |= bmask;
} else {
this._mouseButtonMask &= ~bmask;
}
if (this.dragViewport) {
if (down && !this._viewportDragging) {
this._viewportDragging = true;
@@ -903,24 +904,29 @@ export default class RFB extends EventTargetMixin {
return;
}
if (this._viewOnly) { return; }
// Otherwise we treat this as a mouse click event.
// Send the button down event here, as the button up
// event is sent at the end of this function.
this.sentEventsCounter+=1;
RFB.messages.pointerEvent(this._sock,
this._display.absX(x),
this._display.absY(y),
bmask);
this._sendMouse(x, y, bmask);
}
}
if (this._viewOnly) { return; } // View only, skip mouse events
if (this._rfbConnectionState !== 'connected') { return; }
this.sentEventsCounter+=1;
RFB.messages.pointerEvent(this._sock, this._display.absX(x), this._display.absY(y), this._mouseButtonMask);
// Flush waiting move event first
if (this._mouseMoveTimer !== null) {
clearTimeout(this._mouseMoveTimer);
this._mouseMoveTimer = null;
this._sendMouse(x, y, this._mouseButtonMask);
}
if (down) {
this._mouseButtonMask |= bmask;
} else {
this._mouseButtonMask &= ~bmask;
}
this._sendMouse(x, y, this._mouseButtonMask);
}
_handleMouseMove(x, y) {
@@ -940,10 +946,37 @@ export default class RFB extends EventTargetMixin {
return;
}
this._mousePos = { 'x': x, 'y': y };
// Limit many mouse move events to one every MOUSE_MOVE_DELAY ms
if (this._mouseMoveTimer == null) {
const timeSinceLastMove = Date.now() - this._mouseLastMoveTime;
if (timeSinceLastMove > MOUSE_MOVE_DELAY) {
this._sendMouse(x, y, this._mouseButtonMask);
this._mouseLastMoveTime = Date.now();
} else {
// Too soon since the latest move, wait the remaining time
this._mouseMoveTimer = setTimeout(() => {
this._handleDelayedMouseMove();
}, MOUSE_MOVE_DELAY - timeSinceLastMove);
}
}
}
_handleDelayedMouseMove() {
this._mouseMoveTimer = null;
this._sendMouse(this._mousePos.x, this._mousePos.y,
this._mouseButtonMask);
this._mouseLastMoveTime = Date.now();
}
_sendMouse(x, y, mask) {
if (this._rfbConnectionState !== 'connected') { return; }
if (this._viewOnly) { return; } // View only, skip mouse events
if (this._rfbConnectionState !== 'connected') { return; }
RFB.messages.pointerEvent(this._sock, this._display.absX(x), this._display.absY(y), this._mouseButtonMask);
RFB.messages.pointerEvent(this._sock, this._display.absX(x),
this._display.absY(y), mask);
}
// Message Handlers