Only report touch coordinates if there's a touch

Duh. This prevents screen-pointers from jumping into a corner on screen
after releasing the touchscreen.

Also remove one instance of hidScanInput() that would mess with the
readings of hidCollectData() (keys up/down could not be read).

Author: phijor

3DS/source/main.c

@@ -110,7 +110,6 @@ int main(int argc, char **argv)
     while (aptMainLoop()) {
 
         if (isHomebrew) {
-            hidScanInput();
             if (hidKeysHeld() == EXIT_KEYS) {
                 res = RL_SUCCESS;
                 break;

linux/src/devices/touchscreen.c

@@ -80,22 +80,29 @@ int touchscreen_write(int uinputfd, struct hidinfo *hid)
     int res;
     static struct input_event events[NUMEVENTS];
 
-    size_t i       = 0;
-    events[i].type = EV_KEY;
-    events[i].code = keys[i];
-    events[i].value =
-        HID_HAS_KEY(hid->keys.held | hid->keys.down, HID_KEY_TOUCH);
-    i++;
+    size_t i  = 0;
+    int touch = HID_HAS_KEY(hid->keys.held, HID_KEY_TOUCH);
 
-    events[i].type  = EV_ABS;
-    events[i].code  = ABS_X;
-    events[i].value = hid->touchscreen.px;
+    events[i].type  = EV_KEY;
+    events[i].code  = keys[i];
+    events[i].value = touch;
     i++;
 
-    events[i].type  = EV_ABS;
-    events[i].code  = ABS_Y;
-    events[i].value = hid->touchscreen.py;
-    i++;
+    // Only report coordinates if a touch is registered, as the touchscreen will
+    // always report to be at (0, 0) otherwise . This prevents screen-pointers,
+    // such as your mouse, to suddenly jump into a corner once lift your stylus
+    // or finger off the touchscreen.
+    if (touch) {
+        events[i].type  = EV_ABS;
+        events[i].code  = ABS_X;
+        events[i].value = hid->touchscreen.px;
+        i++;
+
+        events[i].type  = EV_ABS;
+        events[i].code  = ABS_Y;
+        events[i].value = hid->touchscreen.py;
+        i++;
+    }
 
     events[i].type  = EV_SYN;
     events[i].code  = SYN_REPORT;