Implement tilt support on Android

With a patch to Qt to interpret those axis values.

.github/scripts/build-qt.cmake

@@ -277,6 +277,7 @@ if(BASE)
 				patches/windows_clipboard_sadness.diff
 				patches/qt5androidsupport_params.diff
 				patches/android_backtrace.diff
+				patches/androidtilt-qt5.diff
 			6.7.2
 				patches/qtbug-113394.diff
 				patches/cancel_touch_on_pen.diff

.github/scripts/patches/androidtilt-qt5.diff

@@ -0,0 +1,72 @@
+Description: Tilt support for QTabletEvent on Android.
+
+--- a/src/android/jar/src/org/qtproject/qt5/android/QtNative.java
++++ b/src/android/jar/src/org/qtproject/qt5/android/QtNative.java
+@@ -563,8 +563,20 @@
+         if (event.getToolType(0) == MotionEvent.TOOL_TYPE_MOUSE) {
+             sendMouseEvent(event, id);
+         } else if (m_tabletEventSupported && pointerType != 0) {
++            int xtilt, ytilt;
++            double tilt = event.getAxisValue(MotionEvent.AXIS_TILT);
++            if (tilt == 0.0) {
++                xtilt = 0;
++                ytilt = 0;
++            } else {
++                double orientation = ((double)event.getOrientation()) - Math.PI / 2.0;
++                double tiltDegrees = Math.toDegrees(tilt);
++                xtilt = (int)Math.round(Math.cos(orientation) * tiltDegrees);
++                ytilt = (int)Math.round(-Math.sin(orientation) * tiltDegrees);
++            }
+             tabletEvent(id, event.getDeviceId(), event.getEventTime(), event.getAction(), pointerType,
+-                event.getButtonState(), event.getX(), event.getY(), event.getPressure());
++                event.getButtonState(), event.getX(), event.getY(), event.getPressure(),
++                xtilt, ytilt);
+         } else {
+             touchBegin(id);
+             for (int i = 0; i < event.getPointerCount(); ++i) {
+@@ -1219,7 +1231,7 @@
+
+     // tablet methods
+     public static native boolean isTabletEventSupported();
+-    public static native void tabletEvent(int winId, int deviceId, long time, int action, int pointerType, int buttonState, float x, float y, float pressure);
++    public static native void tabletEvent(int winId, int deviceId, long time, int action, int pointerType, int buttonState, float x, float y, float pressure, int xtilt, int ytilt);
+     // tablet methods
+
+     // keyboard methods
+--- a/src/plugins/platforms/android/androidjniinput.cpp
++++ b/src/plugins/platforms/android/androidjniinput.cpp
+@@ -327,7 +327,8 @@
+     }
+
+     static void tabletEvent(JNIEnv */*env*/, jobject /*thiz*/, jint /*winId*/, jint deviceId, jlong time, jint action,
+-        jint pointerType, jint buttonState, jfloat x, jfloat y, jfloat pressure)
++        jint pointerType, jint buttonState, jfloat x, jfloat y, jfloat pressure,
++        jint xtilt, jint ytilt)
+     {
+ #if QT_CONFIG(tabletevent)
+         QPointF globalPosF(x, y);
+@@ -365,12 +366,13 @@
+         }
+
+ #ifdef QT_DEBUG_ANDROID_STYLUS
+-        qDebug() << action << pointerType << buttonState << '@' << x << y << "pressure" << pressure << ": buttons" << buttons;
++        qDebug() << action << pointerType << buttonState << '@' << x << y << "pressure" << pressure << "tilt" << xtilt << ytilt << ": buttons" << buttons;
+ #endif
+
+         QWindowSystemInterface::handleTabletEvent(tlw, ulong(time),
+             localPos, globalPosF, QTabletEvent::Stylus, pointerType,
+-            buttons, pressure, 0, 0, 0., 0., 0, deviceId, Qt::NoModifier);
++            buttons, pressure, qBound(-60, xtilt, 60), qBound(-60, ytilt, 60),
++            0., 0., 0, deviceId, Qt::NoModifier);
+ #endif // QT_CONFIG(tabletevent)
+     }
+
+@@ -875,7 +877,7 @@
+         {"mouseWheel", "(IIIFF)V", (void *)mouseWheel},
+         {"longPress", "(III)V", (void *)longPress},
+         {"isTabletEventSupported", "()Z", (void *)isTabletEventSupported},
+-        {"tabletEvent", "(IIJIIIFFF)V", (void *)tabletEvent},
++        {"tabletEvent", "(IIJIIIFFFII)V", (void *)tabletEvent},
+         {"keyDown", "(IIIZ)V", (void *)keyDown},
+         {"keyUp", "(IIIZ)V", (void *)keyUp},
+         {"keyboardVisibilityChanged", "(Z)V", (void *)keyboardVisibilityChanged},

ChangeLog

@@ -25,6 +25,7 @@ Unreleased Version 2.2.2-pre
  * Feature: Replace "hold shift to arrange" with View > Docks > Arrange Docks, which doesn't require a keyboard. Thanks 3rd_EFNO for suggesting.
  * Feature: Allow configuring temporary tool switch hold time. Thanks 3rd_EFNO and pachuco for suggesting.
  * Fix: Properly pass tilt and barrel rotation values to MyPaint brushes. Thanks MorrowShore for reporting.
+ * Feature: Tilt support on Android. Thanks MorrowShore and Verdrusk for suggesting.
 
 2024-11-06 Version 2.2.2-beta.4
  * Fix: Solve rendering glitches with selection outlines that happen on some systems. Thanks xxxx for reporting.