File Implement-hotplugging-on-Xlib.patch of Package kcm_tablet

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File Implement-hotplugging-on-Xlib.patch of Package kcm_tablet (Revision dea759414b01512b2e2af5cd66149539)

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From 17d5878d56da3384b29cc5aa13f11af8576776dc Mon Sep 17 00:00:00 2001
From: Fabian Vogt <fabian@ritter-vogt.de>
Date: Sun, 31 Dec 2017 14:54:25 +0100
Subject: Implement hotplugging on Xlib

Summary:
Register for events using Xlib and read them using Xcb.
This is a mixture of the method used in
qtbase/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
and plasma-desktop's ca7618dd6173db8a8f0e36d91a38a1d4ac7d0706

BUG: 361743

Test Plan:
Restarted kded after make install, plugging and unplugging
causes notifications.

Reviewers: valeriymalov

Reviewed By: valeriymalov

Subscribers: valeriymalov

Differential Revision: https://phabricator.kde.org/D9576
---
 CMakeLists.txt                     |   2 +-
 src/kded/x11eventnotifier-xlib.cpp | 102 +++++++++++++++++++++++++++----------
 2 files changed, 76 insertions(+), 28 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 19ba8ee..dc75e8f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -31,7 +31,7 @@ if(XCB_XINPUT_FOUND)
     set(USING_X_LIBRARIES XCB::XINPUT XCB::RANDR ${X11_Xrandr_LIB} ${X11_Xinput_LIB})
     add_definitions(-DHAVE_XCB_XINPUT)
 else()
-    message(STATUS "Falling back to X11_XINPUT.  (Daemon will be unable to monitor hotplugging.)")
+    message(STATUS "Falling back to X11_XINPUT.")
     set(USING_X_LIBRARIES XCB::RANDR ${X11_LIBRARIES} ${X11_Xinput_LIB} ${X11_Xrandr_LIB})
 endif()
 
diff --git a/src/kded/x11eventnotifier-xlib.cpp b/src/kded/x11eventnotifier-xlib.cpp
index 82c1da7..705e2f0 100644
--- a/src/kded/x11eventnotifier-xlib.cpp
+++ b/src/kded/x11eventnotifier-xlib.cpp
@@ -22,21 +22,53 @@
 #include <QCoreApplication>
 #include <QX11Info>
 
-
 #include "x11eventnotifier.h"
 
 #include "x11input.h"
 #include "x11inputdevice.h"
 
 #include <xcb/xcb.h>
-#include <xcb/randr.h>
-
-#include <X11/X.h>
-#include <X11/Xlib.h>
-#include <X11/Xatom.h>
-#include <X11/extensions/XInput.h>
 #include <X11/extensions/XInput2.h>
 
+/* XCB events have a slightly different layout, so they can't be directly
+ * treated as XIGenericDeviceEvent. Instead of doing a memmove like
+ * Qt does in qtbase/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp,
+ * we pull in the correct struct definition here. */
+
+typedef enum xcb_input_hierarchy_mask_t {
+    XCB_INPUT_HIERARCHY_MASK_MASTER_ADDED = 1,
+    XCB_INPUT_HIERARCHY_MASK_MASTER_REMOVED = 2,
+    XCB_INPUT_HIERARCHY_MASK_SLAVE_ADDED = 4,
+    XCB_INPUT_HIERARCHY_MASK_SLAVE_REMOVED = 8,
+    XCB_INPUT_HIERARCHY_MASK_SLAVE_ATTACHED = 16,
+    XCB_INPUT_HIERARCHY_MASK_SLAVE_DETACHED = 32,
+    XCB_INPUT_HIERARCHY_MASK_DEVICE_ENABLED = 64,
+    XCB_INPUT_HIERARCHY_MASK_DEVICE_DISABLED = 128
+} xcb_input_hierarchy_mask_t;
+
+typedef struct xcb_input_hierarchy_event_t {
+    uint8_t               response_type;
+    uint8_t               extension;
+    uint16_t              sequence;
+    uint32_t              length;
+    uint16_t              event_type;
+    uint8_t               deviceid;
+    xcb_timestamp_t       time;
+    uint32_t              flags;
+    uint16_t              num_infos;
+    uint8_t               pad0[10];
+    uint32_t              full_sequence;
+} xcb_input_hierarchy_event_t;
+
+typedef struct xcb_input_hierarchy_info_t {
+    uint8_t               deviceid;
+    uint8_t               attachment;
+    uint8_t               type;
+    uint8_t               enabled;
+    uint8_t               pad0[2];
+    uint32_t              flags;
+} xcb_input_hierarchy_info_t;
+
 namespace Wacom
 {
     class X11EventNotifierPrivate
@@ -101,19 +133,19 @@ void X11EventNotifier::stop()
 
 bool X11EventNotifier::nativeEventFilter(const QByteArray &eventType, void *message, long int *result)
 {
-    Q_UNUSED(eventType);
     Q_UNUSED(result);
 
+    if (eventType != "xcb_generic_event_t") {
+        return false;
+    }
+
     xcb_generic_event_t *event = static_cast<xcb_generic_event_t *>(message);
     xcb_ge_generic_event_t *cookie = reinterpret_cast<xcb_ge_generic_event_t *>(message);
 
     if (event->response_type == XCB_GE_GENERIC && cookie->event_type == XI_HierarchyChanged) {
-        // handleX11InputEvent(cookie);
-    } else {
-        // handleX11ScreenEvent(event);
+        handleX11InputEvent(cookie);
     }
 
-    // return QWidget::x11Event(event);
     return false;
 }
 
@@ -122,25 +154,41 @@ bool X11EventNotifier::nativeEventFilter(const QByteArray &eventType, void *mess
 // Handle plug/unplug events
 void X11EventNotifier::handleX11InputEvent(xcb_ge_generic_event_t* event)
 {
-    Q_UNUSED(event)
-    // Sadly there does not seem to be a way to use this functionality :(
+    xcb_input_hierarchy_event_t *hev = reinterpret_cast<xcb_input_hierarchy_event_t *>(event);
+    xcb_input_hierarchy_info_t *data = reinterpret_cast<xcb_input_hierarchy_info_t*>(hev + 1);
+
+    while(hev->num_infos--) {
+        if (data->flags & XCB_INPUT_HIERARCHY_MASK_SLAVE_REMOVED) {
+            dbgWacom << QString::fromLatin1("X11 device with id '%1' removed.").arg(data->deviceid);
+            emit tabletRemoved(data->deviceid);
+
+        } else if (data->flags & XCB_INPUT_HIERARCHY_MASK_SLAVE_ADDED) {
+            dbgWacom << QString::fromLatin1("X11 device with id '%1' added.").arg(data->deviceid);
+
+            X11InputDevice device (data->deviceid, QLatin1String("Unknown X11 Device"));
+
+            if (device.isOpen() && device.isTabletDevice()) {
+                dbgWacom << QString::fromLatin1("Wacom tablet device with X11 id '%1' added.").arg(data->deviceid);
+                emit tabletAdded(data->deviceid);
+            }
+        }
+        data++;
+    }
 }
 
 
 
-int X11EventNotifier::registerForNewDeviceEvent(xcb_connection_t* conn)
+int X11EventNotifier::registerForNewDeviceEvent(xcb_connection_t *conn)
 {
     Q_UNUSED(conn)
-    // This is already done by xcb plugin with more flags, doing this ourselves
-    // will break Qt's xrandr functionality because connection is shared with Qt.
-    // TODO: uncomment this again when we use our private connection.
-#if 0
-    //register RandR events
-    int rrmask = XCB_RANDR_NOTIFY_MASK_SCREEN_CHANGE;
-
-    xcb_randr_select_input(conn, QX11Info::appRootWindow(), 0);
-    xcb_randr_select_input(conn, QX11Info::appRootWindow(), rrmask);
-#endif
-
-    return 0;
+
+    Display *display = QX11Info::display();
+
+    unsigned int bitmask = XI_HierarchyChangedMask;
+
+    XIEventMask mask;
+    mask.mask_len = sizeof(bitmask);
+    mask.mask = reinterpret_cast<unsigned char *>(&bitmask);
+    int status = XISelectEvents(display, DefaultRootWindow(display), &mask, 1);
+    return status == Success ? 0 : 1;
 }
-- 
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File Implement-hotplugging-on-Xlib.patch of Package kcm_tablet (Revision dea759414b01512b2e2af5cd66149539)

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