ui: add the infrastructure to support MT events

Add the required infrastructure to support generating multitouch events.

Signed-off-by: Sergio Lopez <slp@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20230526112925.38794-3-slp@redhat.com>

include/ui/input.h

@@ -8,9 +8,12 @@
 #define INPUT_EVENT_MASK_BTN   (1<<INPUT_EVENT_KIND_BTN)
 #define INPUT_EVENT_MASK_REL   (1<<INPUT_EVENT_KIND_REL)
 #define INPUT_EVENT_MASK_ABS   (1<<INPUT_EVENT_KIND_ABS)
+#define INPUT_EVENT_MASK_MTT   (1<<INPUT_EVENT_KIND_MTT)
 
 #define INPUT_EVENT_ABS_MIN    0x0000
 #define INPUT_EVENT_ABS_MAX    0x7FFF
+#define INPUT_EVENT_SLOTS_MIN  0x0
+#define INPUT_EVENT_SLOTS_MAX  0xa
 
 typedef struct QemuInputHandler QemuInputHandler;
 typedef struct QemuInputHandlerState QemuInputHandlerState;

qapi/ui.json

@@ -1055,11 +1055,13 @@
 #
 # @extra: rear side button of a 5-button mouse (since 2.9)
 #
+# @touch: screen contact on a multi-touch device (since 8.1)
+#
 # Since: 2.0
 ##
 { 'enum'  : 'InputButton',
   'data'  : [ 'left', 'middle', 'right', 'wheel-up', 'wheel-down', 'side',
-  'extra', 'wheel-left', 'wheel-right' ] }
+  'extra', 'wheel-left', 'wheel-right', 'touch' ] }
 
 ##
 # @InputAxis:
@@ -1071,6 +1073,17 @@
 { 'enum'  : 'InputAxis',
   'data'  : [ 'x', 'y' ] }
 
+##
+# @InputMultiTouchType:
+#
+# Type of a multi-touch event.
+#
+# Since: 8.1
+##
+{ 'enum'  : 'InputMultiTouchType',
+  'data'  : [ 'begin', 'update', 'end', 'cancel', 'data' ] }
+
+
 ##
 # @InputKeyEvent:
 #
@@ -1117,13 +1130,46 @@
   'data'  : { 'axis'    : 'InputAxis',
               'value'   : 'int' } }
 
+##
+# @InputMultiTouchEvent:
+#
+# MultiTouch input event.
+#
+# @slot: Which slot has generated the event.
+#
+# @tracking-id: ID to correlate this event with previously generated
+#     events.
+#
+# @axis: Which axis is referenced by @value.
+#
+# @value: Contact position.
+#
+# Since: 8.1
+##
+{ 'struct'  : 'InputMultiTouchEvent',
+  'data'  : { 'type'       : 'InputMultiTouchType',
+              'slot'       : 'int',
+              'tracking-id': 'int',
+              'axis'       : 'InputAxis',
+              'value'      : 'int' } }
+
 ##
 # @InputEventKind:
 #
+# @key: a keyboard input event
+#
+# @btn: a pointer button input event
+#
+# @rel: a relative pointer motion input event
+#
+# @abs: an absolute pointer motion input event
+#
+# @mtt: a multi-touch input event
+#
 # Since: 2.0
 ##
 { 'enum': 'InputEventKind',
-  'data': [ 'key', 'btn', 'rel', 'abs' ] }
+  'data': [ 'key', 'btn', 'rel', 'abs', 'mtt' ] }
 
 ##
 # @InputKeyEventWrapper:
@@ -1149,17 +1195,20 @@
 { 'struct': 'InputMoveEventWrapper',
   'data': { 'data': 'InputMoveEvent' } }
 
+##
+# @InputMultiTouchEventWrapper:
+#
+# Since: 8.1
+##
+{ 'struct': 'InputMultiTouchEventWrapper',
+  'data': { 'data': 'InputMultiTouchEvent' } }
+
 ##
 # @InputEvent:
 #
 # Input event union.
 #
-# @type: the input type, one of:
-#
-#     - 'key': Input event of Keyboard
-#     - 'btn': Input event of pointer buttons
-#     - 'rel': Input event of relative pointer motion
-#     - 'abs': Input event of absolute pointer motion
+# @type: the type of input event
 #
 # Since: 2.0
 ##
@@ -1169,7 +1218,8 @@
   'data'  : { 'key'     : 'InputKeyEventWrapper',
               'btn'     : 'InputBtnEventWrapper',
               'rel'     : 'InputMoveEventWrapper',
-              'abs'     : 'InputMoveEventWrapper' } }
+              'abs'     : 'InputMoveEventWrapper',
+              'mtt'     : 'InputMultiTouchEventWrapper' } }
 
 ##
 # @input-send-event:

replay/replay-input.c

@@ -22,6 +22,7 @@ void replay_save_input_event(InputEvent *evt)
     InputKeyEvent *key;
     InputBtnEvent *btn;
     InputMoveEvent *move;
+    InputMultiTouchEvent *mtt;
     replay_put_dword(evt->type);
 
     switch (evt->type) {
@@ -58,6 +59,14 @@ void replay_save_input_event(InputEvent *evt)
         replay_put_dword(move->axis);
         replay_put_qword(move->value);
         break;
+    case INPUT_EVENT_KIND_MTT:
+        mtt = evt->u.mtt.data;
+        replay_put_dword(mtt->type);
+        replay_put_qword(mtt->slot);
+        replay_put_qword(mtt->tracking_id);
+        replay_put_dword(mtt->axis);
+        replay_put_qword(mtt->value);
+        break;
     case INPUT_EVENT_KIND__MAX:
         /* keep gcc happy */
         break;
@@ -73,6 +82,7 @@ InputEvent *replay_read_input_event(void)
     InputBtnEvent btn;
     InputMoveEvent rel;
     InputMoveEvent abs;
+    InputMultiTouchEvent mtt;
 
     evt.type = replay_get_dword();
     switch (evt.type) {
@@ -109,6 +119,14 @@ InputEvent *replay_read_input_event(void)
         evt.u.abs.data->axis = (InputAxis)replay_get_dword();
         evt.u.abs.data->value = replay_get_qword();
         break;
+    case INPUT_EVENT_KIND_MTT:
+        evt.u.mtt.data = &mtt;
+        evt.u.mtt.data->type = (InputMultiTouchType)replay_get_dword();
+        evt.u.mtt.data->slot = replay_get_qword();
+        evt.u.mtt.data->tracking_id = replay_get_qword();
+        evt.u.mtt.data->axis = (InputAxis)replay_get_dword();
+        evt.u.mtt.data->value = replay_get_qword();
+        break;
     case INPUT_EVENT_KIND__MAX:
         /* keep gcc happy */
         break;

ui/input.c

@@ -212,6 +212,7 @@ static void qemu_input_event_trace(QemuConsole *src, InputEvent *evt)
     InputKeyEvent *key;
     InputBtnEvent *btn;
     InputMoveEvent *move;
+    InputMultiTouchEvent *mtt;
 
     if (src) {
         idx = qemu_console_get_index(src);
@@ -250,6 +251,11 @@ static void qemu_input_event_trace(QemuConsole *src, InputEvent *evt)
         name = InputAxis_str(move->axis);
         trace_input_event_abs(idx, name, move->value);
         break;
+    case INPUT_EVENT_KIND_MTT:
+        mtt = evt->u.mtt.data;
+        name = InputAxis_str(mtt->axis);
+        trace_input_event_mtt(idx, name, mtt->value);
+        break;
     case INPUT_EVENT_KIND__MAX:
         /* keep gcc happy */
         break;

ui/trace-events

@@ -90,6 +90,7 @@ input_event_key_qcode(int conidx, const char *qcode, bool down) "con %d, key qco
 input_event_btn(int conidx, const char *btn, bool down) "con %d, button %s, down %d"
 input_event_rel(int conidx, const char *axis, int value) "con %d, axis %s, value %d"
 input_event_abs(int conidx, const char *axis, int value) "con %d, axis %s, value 0x%x"
+input_event_mtt(int conidx, const char *axis, int value) "con %d, axis %s, value 0x%x"
 input_event_sync(void) ""
 input_mouse_mode(int absolute) "absolute %d"