Emscripten: fixed incorrect conversion of touch motion events to mouse motion events

src/video/emscripten/SDL_emscriptenevents.c

@@ -437,6 +437,7 @@ Emscripten_HandleTouch(int eventType, const EmscriptenTouchEvent *touchEvent, vo
     for (i = 0; i < touchEvent->numTouches; i++) {
         SDL_FingerID id;
         float x, y;
+        int mx, my;
 
         if (!touchEvent->touches[i].isChanged)
             continue;
@@ -445,11 +446,14 @@ Emscripten_HandleTouch(int eventType, const EmscriptenTouchEvent *touchEvent, vo
         x = touchEvent->touches[i].canvasX / client_w;
         y = touchEvent->touches[i].canvasY / client_h;
 
+        mx = x * window_data->window->w;
+        my = y * window_data->window->h;
+
         if (eventType == EMSCRIPTEN_EVENT_TOUCHSTART) {
             if (!window_data->finger_touching) {
                 window_data->finger_touching = SDL_TRUE;
                 window_data->first_finger = id;
-                SDL_SendMouseMotion(window_data->window, SDL_TOUCH_MOUSEID, 0, x, y);
+                SDL_SendMouseMotion(window_data->window, SDL_TOUCH_MOUSEID, 0, mx, my);
                 SDL_SendMouseButton(window_data->window, SDL_TOUCH_MOUSEID, SDL_PRESSED, SDL_BUTTON_LEFT);
             }
             SDL_SendTouch(deviceId, id, SDL_TRUE, x, y, 1.0f);
@@ -459,7 +463,7 @@ Emscripten_HandleTouch(int eventType, const EmscriptenTouchEvent *touchEvent, vo
             }
         } else if (eventType == EMSCRIPTEN_EVENT_TOUCHMOVE) {
             if ((window_data->finger_touching) && (window_data->first_finger == id)) {
-                SDL_SendMouseMotion(window_data->window, SDL_TOUCH_MOUSEID, 0, x, y);
+                SDL_SendMouseMotion(window_data->window, SDL_TOUCH_MOUSEID, 0, mx, my);
             }
             SDL_SendTouchMotion(deviceId, id, x, y, 1.0f);