project for a (works on my devices) demo

headers/input/touch/touch_data.h

@@ -0,0 +1,30 @@
+#pragma once
+
+#include <stdint.h>
+
+typedef struct {
+	int64_t x;	/* touch horizontal center */
+	int64_t y;	/* touch vertical center */
+} touch_coordinates;
+
+/* using ultrawide ints (narrowing later) */
+typedef struct {
+	uint64_t slot_number;
+	uint64_t tracking_id;	/* this increases with each new touch */
+	touch_coordinates position;
+	/* ignoring ABS_MT_TOUCH_MAJOR 
+		and ABS_MT_WIDTH_MAJOR 
+	*/
+} touch_event;
+
+touch_event* touch_event_new();
+
+void touch_event_copy( touch_event *dst, touch_event *src);
+
+touch_coordinates* new_touch_coordinates_buffer( uint8_t count);
+
+void free_touch_coordinates_buffer( touch_coordinates* buffer);
+
+void touch_events_array_copy( touch_event ***dst, touch_event **src, uint8_t count);
+
+void free_touch_events_array( touch_event **buffer, uint8_t count);