From 6224130cc821b0ef0dbdda80837e872c7996b916 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pasi=20Pet=C3=A4j=C3=A4j=C3=A4rvi?= <pasi.petajajarvi@qt.io>
Date: Thu, 19 Dec 2019 13:01:21 +0200
Subject: Add touch input device mapping support via QT_QPA_EGLFS_KMS_CONFIG

To be feature parity with evdev touch which already supports this

Change-Id: Ie7f9c868ea888725b24c3855106e1c0c0ba943a9
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
---
 .../input/libinput/qlibinputtouch.cpp              | 40 +++++++++++++++++++---
 .../input/libinput/qlibinputtouch_p.h              |  7 +++-
 2 files changed, 41 insertions(+), 6 deletions(-)

(limited to 'src/platformsupport/input')

diff --git a/src/platformsupport/input/libinput/qlibinputtouch.cpp b/src/platformsupport/input/libinput/qlibinputtouch.cpp
index ad85360b0e..e1abd44eb5 100644
--- a/src/platformsupport/input/libinput/qlibinputtouch.cpp
+++ b/src/platformsupport/input/libinput/qlibinputtouch.cpp
@@ -38,6 +38,7 @@
 ****************************************************************************/
 
 #include "qlibinputtouch_p.h"
+#include "qtouchoutputmapping_p.h"
 #include <libinput.h>
 #include <QtGui/QGuiApplication>
 #include <QtGui/QScreen>
@@ -45,6 +46,8 @@
 
 QT_BEGIN_NAMESPACE
 
+Q_DECLARE_LOGGING_CATEGORY(qLcLibInput)
+
 QWindowSystemInterface::TouchPoint *QLibInputTouch::DeviceState::point(int32_t slot)
 {
     const int id = qMax(0, slot);
@@ -62,12 +65,23 @@ QLibInputTouch::DeviceState *QLibInputTouch::deviceState(libinput_event_touch *e
     return &m_devState[dev];
 }
 
-static inline QPointF getPos(libinput_event_touch *e)
+QPointF QLibInputTouch::getPos(libinput_event_touch *e)
 {
-    // TODO Map to correct screen using QTouchOutputMapping.
-    // Perhaps investigate libinput_device_get_output_name as well.
-    // For now just use the primary screen.
+    DeviceState *state = deviceState(e);
     QScreen *screen = QGuiApplication::primaryScreen();
+    if (!state->m_screenName.isEmpty()) {
+        if (!m_screen) {
+            const QList<QScreen *> screens = QGuiApplication::screens();
+            for (QScreen *s : screens) {
+                if (s->name() == state->m_screenName) {
+                    m_screen = s;
+                    break;
+                }
+            }
+        }
+        if (m_screen)
+            screen = m_screen;
+    }
     const QRect geom = QHighDpi::toNativePixels(screen->geometry(), screen);
     const double x = libinput_event_touch_get_x_transformed(e, geom.width());
     const double y = libinput_event_touch_get_y_transformed(e, geom.height());
@@ -76,9 +90,25 @@ static inline QPointF getPos(libinput_event_touch *e)
 
 void QLibInputTouch::registerDevice(libinput_device *dev)
 {
+    struct udev_device *udev_device;
+    udev_device = libinput_device_get_udev_device(dev);
+    QString devNode = QString::fromUtf8(udev_device_get_devnode(udev_device));
+    QString devName = QString::fromUtf8(libinput_device_get_name(dev));
+
+    qCDebug(qLcLibInput, "libinput: registerDevice %s - %s",
+            qPrintable(devNode), qPrintable(devName));
+
+    QTouchOutputMapping mapping;
+    if (mapping.load()) {
+        m_devState[dev].m_screenName = mapping.screenNameForDeviceNode(devNode);
+        if (!m_devState[dev].m_screenName.isEmpty())
+            qCDebug(qLcLibInput, "libinput: Mapping device %s to screen %s",
+                    qPrintable(devNode), qPrintable(m_devState[dev].m_screenName));
+    }
+
     QTouchDevice *&td = m_devState[dev].m_touchDevice;
     td = new QTouchDevice;
-    td->setName(QString::fromUtf8(libinput_device_get_name(dev)));
+    td->setName(devName);
     td->setType(QTouchDevice::TouchScreen);
     td->setCapabilities(QTouchDevice::Position | QTouchDevice::Area);
     QWindowSystemInterface::registerTouchDevice(td);
diff --git a/src/platformsupport/input/libinput/qlibinputtouch_p.h b/src/platformsupport/input/libinput/qlibinputtouch_p.h
index 51304e6a21..2682b83b26 100644
--- a/src/platformsupport/input/libinput/qlibinputtouch_p.h
+++ b/src/platformsupport/input/libinput/qlibinputtouch_p.h
@@ -42,6 +42,7 @@
 
 #include <QtCore/QHash>
 #include <QtCore/QList>
+#include <QtCore/QPointer>
 #include <qpa/qwindowsysteminterface.h>
 
 //
@@ -60,6 +61,7 @@ struct libinput_device;
 
 QT_BEGIN_NAMESPACE
 
+class QScreen;
 class QLibInputTouch
 {
 public:
@@ -73,15 +75,18 @@ public:
 
 private:
     struct DeviceState {
-        DeviceState() : m_touchDevice(nullptr) { }
+        DeviceState() : m_touchDevice(nullptr), m_screenName() { }
         QWindowSystemInterface::TouchPoint *point(int32_t slot);
         QList<QWindowSystemInterface::TouchPoint> m_points;
         QTouchDevice *m_touchDevice;
+        QString m_screenName;
     };
 
     DeviceState *deviceState(libinput_event_touch *e);
+    QPointF getPos(libinput_event_touch *e);
 
     QHash<libinput_device *, DeviceState> m_devState;
+    mutable QPointer<QScreen> m_screen;
 };
 
 QT_END_NAMESPACE
-- 
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