macos: fix scale on macOS 12 beta

This is a port of the fix in the quartz backend to the new macOS backend.

From the original commit:

In macOS-12.sdk CGContextConverSizeToDeviceSpace returns a negative
height and passing that to CGContextScaleCTM in turn causes the cairo
surface to draw outside the window where it can't be seen. Passing the
absolute values of the scale factors fixes the display on macOS 12 without
affecting earlier macOS versions.

diff --git a/gdk/macos/gdkmacossurface.c b/gdk/macos/gdkmacossurface.c
index f94eaa2eca2be2e483820f7a6ae56fda456a5b8c..60f6fe238902258d15b6fa9b4879642958ce965b 100644 (file)
--- a/gdk/macos/gdkmacossurface.c
+++ b/gdk/macos/gdkmacossurface.c
@@ -809,7 +809,7 @@ _gdk_macos_surface_acquire_context (GdkMacosSurface *self,
       scale = CGSizeMake (1.0, 1.0);
       scale = CGContextConvertSizeToDeviceSpace (cg_context, scale);
 
-      CGContextScaleCTM (cg_context, 1.0 / scale.width, 1.0 / scale.height);
+      CGContextScaleCTM (cg_context, 1.0 / fabs (scale.width), 1.0 / fabs (scale.height));
     }
 
   return cg_context;