Fixed bug 4581 - generate synthetic mouse events at window boundaries

when real touch events are actually outside the window.

src/events/SDL_touch.c

@@ -257,18 +257,16 @@ SDL_SendTouch(SDL_TouchID id, SDL_FingerID fingerid,
                         if (finger_touching == SDL_FALSE) {
                             int pos_x = (int)(x * (float)window->w);
                             int pos_y = (int)(y * (float)window->h);
-                            if (pos_x >= 0 && pos_y >= 0 && pos_x < window->w && pos_y < window->h) {
-                                SDL_SendMouseMotion(window, SDL_TOUCH_MOUSEID, 0, pos_x, pos_y);
-                                SDL_SendMouseButton(window, SDL_TOUCH_MOUSEID, SDL_PRESSED, SDL_BUTTON_LEFT);
-                            }
+                            if (pos_x < 0) pos_x = 0;
+                            if (pos_x > window->w - 1) pos_x = window->w - 1;
+                            if (pos_y < 0) pos_y = 0;
+                            if (pos_y > window->h - 1) pos_y = window->h - 1;
+                            SDL_SendMouseMotion(window, SDL_TOUCH_MOUSEID, 0, pos_x, pos_y);
+                            SDL_SendMouseButton(window, SDL_TOUCH_MOUSEID, SDL_PRESSED, SDL_BUTTON_LEFT);
                         }
                     } else {
                         if (finger_touching == SDL_TRUE && track_touchid == id && track_fingerid == fingerid) {
-                            int pos_x = (int)(x * (float)window->w);
-                            int pos_y = (int)(y * (float)window->h);
-                            if (pos_x >= 0 && pos_y >= 0 && pos_x < window->w && pos_y < window->h) {
-                                SDL_SendMouseButton(window, SDL_TOUCH_MOUSEID, SDL_RELEASED, SDL_BUTTON_LEFT);
-                            }
+                            SDL_SendMouseButton(window, SDL_TOUCH_MOUSEID, SDL_RELEASED, SDL_BUTTON_LEFT);
                         }
                     }
                 }
@@ -361,9 +359,11 @@ SDL_SendTouchMotion(SDL_TouchID id, SDL_FingerID fingerid,
                     if (finger_touching == SDL_TRUE && track_touchid == id && track_fingerid == fingerid) {
                         int pos_x = (int)(x * (float)window->w);
                         int pos_y = (int)(y * (float)window->h);
-                        if (pos_x >= 0 && pos_y >= 0 && pos_x < window->w && pos_y < window->h) {
-                            SDL_SendMouseMotion(window, SDL_TOUCH_MOUSEID, 0, pos_x, pos_y);
-                        }
+                        if (pos_x < 0) pos_x = 0;
+                        if (pos_x > window->w - 1) pos_x = window->w - 1;
+                        if (pos_y < 0) pos_y = 0;
+                        if (pos_y > window->h - 1) pos_y = window->h - 1;
+                        SDL_SendMouseMotion(window, SDL_TOUCH_MOUSEID, 0, pos_x, pos_y);
                     }
                 }
             }