Support high-resolution scroll
VirtualMouse currently supports -1f to 1f float scroll values,
but it worked for integer values only as input framework supported
only REL_HWHEEL and REL_WHEEL events. With the introduction of
high-res scroll event support (REL_HWHEEL_HI_RES and REL_WHEEL_HI_RES),
granular mouse scrolling can be done, and VirtualMouse scroll API
would work for all float values.
Flag: android.companion.virtualdevice.flags.high_resolution_scroll
Test: atest VirtualMouseTest
Bug: 335160780
Change-Id: I7b13ac1722b6fd31736fe1c0117d4de6e838261a
diff --git a/include/input/Input.h b/include/input/Input.h
index 456977b..17672d1 100644
--- a/include/input/Input.h
+++ b/include/input/Input.h
@@ -196,6 +196,13 @@
#define MAX_POINTER_ID 31
/*
+ * Number of high resolution mouse scroll units for one detent (mouse wheel click), as defined in
+ * evdev. This is relevant when an input device is emitting REL_WHEEL_HI_RES or REL_HWHEEL_HI_RES
+ * events.
+ */
+constexpr int32_t kEvdevMouseHighResScrollUnitsPerDetent = 120;
+
+/*
* Declare a concrete type for the NDK's input event forward declaration.
*/
struct AInputEvent {