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vdi-cloud/terminal/moonlight/patches/0005-vdi-native-linux-cursor.patch

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--- a/app/streaming/session.cpp
+++ b/app/streaming/session.cpp
@@ -1,3 +1,4 @@
+#include "vdi_native_cursor.h"
#include "session.h"
#include "settings/streamingpreferences.h"
#include "streaming/streamutils.h"
@@ -1968,8 +1969,10 @@
VdiInputTiming vdiInputTiming(qEnvironmentVariableIntValue("VDI_INPUT_TIMING") == 1);
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION, "VDI input priority: %s",
qEnvironmentVariableIntValue("VDI_INPUT_PRIORITY") == 1 ? "enabled" : "disabled");
+ VdiNativeCursor vdiNativeCursor(m_Window, m_InputHandler);
SDL_Event event;
for (;;) {
+ if (!vdiNativeCursor.tick()) goto DispatchDeferredCleanup;
if (!vdiInputPriority.takeDeferred(event, SDL_GetWindowID(m_Window))) {
#if SDL_VERSION_ATLEAST(2, 0, 18) && !defined(STEAM_LINK)
// SDL 2.0.18 has a proper wait event implementation that uses platform
@@ -1981,7 +1984,7 @@
// NB: This behavior was introduced in SDL 2.0.16, but had a few critical
// issues that could cause indefinite timeouts, delayed joystick detection,
// and other problems.
- if (!SDL_WaitEventTimeout(&event, 1000)) {
+ if (!SDL_WaitEventTimeout(&event, vdiNativeCursor.enabled() ? 4 : 1000)) {
presence.runCallbacks();
continue;
}
@@ -2006,6 +2009,7 @@
continue;
}
}
+ vdiNativeCursor.observe(event);
vdiInputTiming.observe(event, SDL_GetWindowID(m_Window));
switch (event.type) {
case SDL_QUIT:
@@ -2322,6 +2326,7 @@
}
DispatchDeferredCleanup:
+ vdiNativeCursor.shutdown();
vdiInputTiming.report(vdiInputPriority.prioritized());
// Switch back to synchronous logging mode
StreamUtils::exitAsyncLoggingMode();
--- a/app/streaming/input/input.h
+++ b/app/streaming/input/input.h
@@ -89,6 +89,12 @@
~SdlInputHandler();
void setWindow(SDL_Window* window);
+
+ bool isNativeCursorAbsoluteMode() const { return m_AbsoluteMouseMode; }
+ void enableNativeCursorVisibility() {
+ m_MouseCursorCapturedVisibilityState = SDL_ENABLE;
+ SDL_ShowCursor(SDL_ENABLE);
+ }
void handleKeyEvent(SDL_KeyboardEvent* event);
--- a/app/streaming/input/keyboard.cpp
+++ b/app/streaming/input/keyboard.cpp
@@ -68,6 +68,7 @@
break;
case KeyComboToggleMouseMode:
+ if (SDL_getenv("VDI_NATIVE_CURSOR_STATE")) break;
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
"Detected mouse mode toggle combo");
@@ -82,6 +83,7 @@
break;
case KeyComboToggleCursorHide:
+ if (SDL_getenv("VDI_NATIVE_CURSOR_STATE")) break;
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
"Detected show mouse combo");
--- /dev/null
+++ b/app/streaming/vdi_native_cursor.h
@@ -0,0 +1,158 @@
+#pragma once
+
+#include <QFile>
+#include <QImage>
+#include <QSaveFile>
+#include <QtEndian>
+#include <time.h>
+#include "input/input.h"
+#include "streamutils.h"
+
+// Linux X11 single-seat native cursor. Called only by the SDL main thread.
+// The producer starts cursor-free before this session's first captured frame.
+class VdiNativeCursor {
+public:
+ VdiNativeCursor(SDL_Window* window, SdlInputHandler* input) :
+ m_Window(window), m_Input(input), m_Path(qgetenv("VDI_NATIVE_CURSOR_STATE")),
+ m_Epoch(qgetenv("VDI_NATIVE_CURSOR_EPOCH").toULongLong()) {}
+
+ bool enabled() const { return !m_Path.isEmpty(); }
+
+ void observe(const SDL_Event& event) {
+ if (event.type == SDL_MOUSEMOTION || event.type == SDL_MOUSEBUTTONDOWN ||
+ event.type == SDL_MOUSEBUTTONUP) {
+ m_LastInput = nowNs();
+ ++m_InputSequence;
+ }
+ }
+
+ bool tick() {
+ if (!enabled()) return true;
+ if (QByteArray(SDL_GetCurrentVideoDriver()) != "x11") return fail("requires X11 cursor backend");
+ const quint64 pollTime = nowNs();
+ if (pollTime - m_LastPoll < 4000000) return true;
+ m_LastPoll = pollTime;
+ QFile f(QString::fromUtf8(m_Path));
+ if (!f.open(QIODevice::ReadOnly) || f.size() < 76 || f.size() > 65608)
+ return fail("missing or oversized state");
+ const QByteArray packet = f.readAll();
+ // The producer may atomically replace state after pollTime. Compare
+ // against a timestamp taken AFTER the read, never before opening it.
+ const quint64 now = nowNs();
+ const auto* p = reinterpret_cast<const uchar*>(packet.constData());
+ auto u32 = [p](int offset) { return qFromLittleEndian<quint32>(p + offset); };
+ auto u64 = [p](int offset) { return qFromLittleEndian<quint64>(p + offset); };
+ if (packet.left(8) != QByteArray("VDICUR1\0", 8) || u64(8) != m_Epoch ||
+ u64(16) < m_Sequence || u64(24) > now || now - u64(24) > 2000000000)
+ return fail("stale or mismatched lease");
+ const int w = u32(32), h = u32(36), hx = u32(40), hy = u32(44);
+ const int x = qint32(u32(48)), y = qint32(u32(52));
+ const int sw = u32(56), sh = u32(60);
+ if (w < 1 || w > 128 || h < 1 || h > 128 || hx < 0 || hx >= w ||
+ hy < 0 || hy >= h || sw != 2560 || sh != 1440 ||
+ x < 0 || x >= sw || y < 0 || y >= sh || packet.size() != 72 + w*h*4 ||
+ !m_Input->isNativeCursorAbsoluteMode())
+ return fail("unsupported shape, display or input mode");
+ m_Sequence = u64(16);
+ int ww, wh;
+ SDL_GetWindowSize(m_Window, &ww, &wh);
+ SDL_Rect src = {0, 0, sw, sh}, dst = {0, 0, ww, wh};
+ StreamUtils::scaleSourceToDestinationSurface(&src, &dst);
+ if (dst.w <= 0 || dst.h <= 0) return fail("empty viewport");
+ const int cw = qMax(1, qRound(double(w) * dst.w / sw));
+ const int ch = qMax(1, qRound(double(h) * dst.h / sh));
+ if (cw > 256 || ch > 256) return fail("oversized scaled cursor");
+ const quint64 acknowledged = u64(64 + w*h*4);
+ const QByteArray pixels = packet.mid(64, w*h*4);
+ if (pixels != m_Pixels || w != m_Width || h != m_Height || hx != m_HotX ||
+ hy != m_HotY || dst.w != m_ViewWidth || dst.h != m_ViewHeight) {
+ QImage image(reinterpret_cast<const uchar*>(pixels.constData()), w, h,
+ w * 4, QImage::Format_RGBA8888);
+ image = image.scaled(cw, ch, Qt::IgnoreAspectRatio, Qt::FastTransformation);
+ // SDL2's X11 Xcursor backend copies pixels without premultiplying.
+ // XRender requires premultiplied channels, including antialiased edges.
+ image = image.convertToFormat(QImage::Format_RGBA8888_Premultiplied);
+ SDL_Surface* surface = SDL_CreateRGBSurfaceWithFormatFrom(
+ image.bits(), cw, ch, 32, image.bytesPerLine(), SDL_PIXELFORMAT_RGBA32);
+ if (!surface) return fail("SDL surface failed");
+ SDL_Cursor* next = SDL_CreateColorCursor(surface,
+ qMin(cw - 1, qRound(double(hx) * dst.w / sw)),
+ qMin(ch - 1, qRound(double(hy) * dst.h / sh)));
+ SDL_FreeSurface(surface);
+ if (!next) return fail("SDL cursor failed");
+ SDL_SetCursor(next);
+ if (m_Cursor) SDL_FreeCursor(m_Cursor);
+ m_Cursor = next;
+ m_Pixels = pixels;
+ m_Width = w; m_Height = h; m_HotX = hx; m_HotY = hy;
+ m_ViewWidth = dst.w; m_ViewHeight = dst.h;
+ SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
+ "VDI native shape: %dx%d hotspot=%d,%d sequence=%llu",
+ w, h, hx, hy, (unsigned long long)m_Sequence);
+ }
+ int mx, my;
+ const auto buttons = SDL_GetMouseState(&mx, &my);
+ const bool inside = mx >= dst.x && my >= dst.y && mx < dst.x + dst.w && my < dst.y + dst.h;
+ const bool focused = SDL_GetKeyboardFocus() == m_Window;
+ if (m_PublishedInput != m_InputSequence) {
+ QByteArray message(16, '\0');
+ qToLittleEndian<quint64>(m_InputSequence, reinterpret_cast<uchar*>(message.data()));
+ qToLittleEndian<qint32>(qBound(0, (mx-dst.x)*sw/dst.w, sw-1),
+ reinterpret_cast<uchar*>(message.data()+8));
+ qToLittleEndian<qint32>(qBound(0, (my-dst.y)*sh/dst.h, sh-1),
+ reinterpret_cast<uchar*>(message.data()+12));
+ QSaveFile outgoing(QString::fromUtf8(m_Path)+".input");
+ if (!outgoing.open(QIODevice::WriteOnly) || outgoing.write(message) != 16 || !outgoing.commit())
+ return fail("input acknowledgement file failed");
+ m_PublishedInput = m_InputSequence;
+ }
+ m_Input->enableNativeCursorVisibility();
+ SDL_SetCursor(focused && inside ? m_Cursor : SDL_GetDefaultCursor());
+ // Initial alignment, and host-initiated warps only after local input has
+ // settled. Never pull the pointer back using delayed motion echoes.
+ if (focused && inside && !buttons && acknowledged == m_InputSequence &&
+ now - m_LastInput > 500000000) {
+ const int tx = dst.x + qRound(double(x) * dst.w / sw);
+ const int ty = dst.y + qRound(double(y) * dst.h / sh);
+ if (qAbs(tx - mx) > 2 || qAbs(ty - my) > 2) {
+ // SDL2's X11 in-window warp is a no-op with pointer barriers
+ // (used by fullscreen absolute mode). Global warp honors this
+ // in-viewport target while actually moving the native pointer.
+ int wx, wy;
+ SDL_GetWindowPosition(m_Window, &wx, &wy);
+ if (SDL_WarpMouseGlobal(wx+tx, wy+ty) < 0)
+ return fail("host cursor warp failed");
+ m_LastInput = now;
+ }
+ }
+ return true;
+ }
+
+ void shutdown() {
+ if (m_Cursor) {
+ SDL_SetCursor(SDL_GetDefaultCursor());
+ SDL_FreeCursor(m_Cursor);
+ m_Cursor = nullptr;
+ }
+ }
+
+private:
+ static quint64 nowNs() {
+ struct timespec t;
+ clock_gettime(CLOCK_MONOTONIC, &t);
+ return quint64(t.tv_sec)*1000000000 + t.tv_nsec;
+ }
+ bool fail(const char* reason) {
+ SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "VDI native cursor ended: %s", reason);
+ shutdown();
+ return false;
+ }
+ SDL_Window* m_Window;
+ SdlInputHandler* m_Input;
+ QByteArray m_Path, m_Pixels;
+ quint64 m_Epoch, m_Sequence = 0, m_LastPoll = 0, m_LastInput = nowNs();
+ quint64 m_InputSequence = 0, m_PublishedInput = 0;
+ SDL_Cursor* m_Cursor = nullptr;
+ int m_Width = 0, m_Height = 0, m_HotX = 0, m_HotY = 0;
+ int m_ViewWidth = 0, m_ViewHeight = 0;
+};
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