3 files changed, 17 insertions, 9 deletions

diff --git a/src/mac.m b/src/mac.m
index f665210..19523b4 100644
--- a/src/mac.m
+++ b/src/mac.m
@@ -1058,17 +1058,21 @@ puglRealize(PuglView* view)
     CVDisplayLinkRelease(link);
   }
 
-  if (view->frame.width == 0.0 && view->frame.height == 0.0) {
+  // Set the size to the default if it has not already been set
+  if (view->frame.width <= 0.0 || view->frame.height <= 0.0) {
     const PuglViewSize defaultSize = view->sizeHints[PUGL_DEFAULT_SIZE];
     if (!defaultSize.width || !defaultSize.height) {
       return PUGL_BAD_CONFIGURATION;
     }
 
-    const double screenWidthPx  = [screen frame].size.width * scaleFactor;
-    const double screenHeightPx = [screen frame].size.height * scaleFactor;
-
     view->frame.width  = defaultSize.width;
     view->frame.height = defaultSize.height;
+  }
+
+  // Center top-level windows if a position has not been set
+  if (!view->parent && !view->frame.x && !view->frame.y) {
+    const double screenWidthPx  = [screen frame].size.width * scaleFactor;
+    const double screenHeightPx = [screen frame].size.height * scaleFactor;
 
     view->frame.x = (PuglCoord)((screenWidthPx - view->frame.width) / 2.0);
     view->frame.y = (PuglCoord)((screenHeightPx - view->frame.height) / 2.0);
diff --git a/src/win.c b/src/win.c
index 34ad4c3..c83c91d 100644
--- a/src/win.c
+++ b/src/win.c
@@ -1372,21 +1372,25 @@ puglWinCreateWindow(PuglView* const   view,
   const unsigned winFlags   = puglWinGetWindowFlags(view);
   const unsigned winExFlags = puglWinGetWindowExFlags(view);
 
-  if (view->frame.width <= 0.0 && view->frame.height <= 0.0) {
+  // Set the size to the default if it has not already been set
+  if (view->frame.width <= 0.0 || view->frame.height <= 0.0) {
     const PuglViewSize defaultSize = view->sizeHints[PUGL_DEFAULT_SIZE];
     if (!defaultSize.width || !defaultSize.height) {
       return PUGL_BAD_CONFIGURATION;
     }
 
+    view->frame.width  = defaultSize.width;
+    view->frame.height = defaultSize.height;
+  }
+
+  // Center top-level windows if a position has not been set
+  if (!view->parent && !view->frame.x && !view->frame.y) {
     RECT desktopRect;
     GetClientRect(GetDesktopWindow(), &desktopRect);
 
     const int screenWidth  = desktopRect.right - desktopRect.left;
     const int screenHeight = desktopRect.bottom - desktopRect.top;
 
-    view->frame.width  = defaultSize.width;
-    view->frame.height = defaultSize.height;
-
     view->frame.x = (PuglCoord)((screenWidth - view->frame.width) / 2);
     view->frame.y = (PuglCoord)((screenHeight - view->frame.height) / 2);
   }
diff --git a/src/x11.c b/src/x11.c
index 6affa9f..78cd48e 100644
--- a/src/x11.c
+++ b/src/x11.c
@@ -369,7 +369,7 @@ puglRealize(PuglView* const view)
   }
 
   // Set the size to the default if it has not already been set
-  if (view->frame.width <= 0.0 && view->frame.height <= 0.0) {
+  if (view->frame.width <= 0.0 || view->frame.height <= 0.0) {
     const PuglViewSize defaultSize = view->sizeHints[PUGL_DEFAULT_SIZE];
     if (!defaultSize.width || !defaultSize.height) {
       return PUGL_BAD_CONFIGURATION;