[gtk/wip/chergert/for-main: 5/10] macos: add clamp helper for monitor workarea

[Christian Hergert <chergert src gnome org>]

commit 2e760e3b7dc0ed9f6bbdfe658ebd9616ef131b85
Author: Christian Hergert <christian hergert me>
Date:   Mon Feb 28 22:42:00 2022 -0800

    macos: add clamp helper for monitor workarea
    
    This adds a convenience wrapper we can use to clamp a surface rectangle to
    the workarea of a monitor.

 gdk/macos/gdkmacosmonitor-private.h |  2 ++
 gdk/macos/gdkmacosmonitor.c         | 26 ++++++++++++++++++++++++++
 2 files changed, 28 insertions(+)
---
diff --git a/gdk/macos/gdkmacosmonitor-private.h b/gdk/macos/gdkmacosmonitor-private.h
index dfde4142c0..1a4e197f76 100644
--- a/gdk/macos/gdkmacosmonitor-private.h
+++ b/gdk/macos/gdkmacosmonitor-private.h
@@ -41,6 +41,8 @@ void               _gdk_macos_monitor_add_frame_callback    (GdkMacosMonitor   *
                                                              GdkMacosSurface   *surface);
 void               _gdk_macos_monitor_remove_frame_callback (GdkMacosMonitor   *self,
                                                              GdkMacosSurface   *surface);
+void               _gdk_macos_monitor_clamp                 (GdkMacosMonitor   *self,
+                                                             GdkRectangle      *area);
 
 G_END_DECLS
 
diff --git a/gdk/macos/gdkmacosmonitor.c b/gdk/macos/gdkmacosmonitor.c
index bfec76b7ef..a9aba3634b 100644
--- a/gdk/macos/gdkmacosmonitor.c
+++ b/gdk/macos/gdkmacosmonitor.c
@@ -431,3 +431,29 @@ _gdk_macos_monitor_remove_frame_callback (GdkMacosMonitor *self,
         gdk_display_link_source_pause (self->display_link);
     }
 }
+
+void
+_gdk_macos_monitor_clamp (GdkMacosMonitor *self,
+                          GdkRectangle    *area)
+{
+  GdkRectangle workarea;
+  GdkRectangle geom;
+
+  g_return_if_fail (GDK_IS_MACOS_MONITOR (self));
+  g_return_if_fail (area != NULL);
+
+  gdk_macos_monitor_get_workarea (GDK_MONITOR (self), &workarea);
+  gdk_monitor_get_geometry (GDK_MONITOR (self), &geom);
+
+  if (area->x + area->width > workarea.x + workarea.width)
+    area->x = workarea.x + workarea.width - area->width;
+
+  if (area->x < workarea.x)
+    area->x = workarea.x;
+
+  if (area->y + area->height > workarea.y + workarea.height)
+    area->y = workarea.y + workarea.height - area->height;
+
+  if (area->y < workarea.y)
+    area->y = workarea.y;
+}