Fix [eafa029f3a]: blurry text on retina screens when using backing CALayer. Sets the layer.contentsScale to equal the backingScaleFactor of the screen where its view is being displayed.

1 files changed, 13 insertions, 0 deletions

diff --git a/macosx/tkMacOSXWindowEvent.c b/macosx/tkMacOSXWindowEvent.c
index f7a160a..c4b8c07 100644
--- a/macosx/tkMacOSXWindowEvent.c
+++ b/macosx/tkMacOSXWindowEvent.c
@@ -948,6 +948,19 @@ ConfigureRestrictProc(
     return NO;
 }
 
+- (void) viewDidChangeBackingProperties
+{
+
+    /*
+     * Make sure that the layer uses a contentScale that matches the
+     * backing scale factor of the screen.  This avoids blurry text whe
+     * the view is on a Retina display, as well as incorrect size when
+     * the view is on a normal display.
+     */
+    
+    self.layer.contentsScale = self.window.screen.backingScaleFactor;
+}
+
 - (void) addTkDirtyRect: (NSRect) rect
 {
     _tkNeedsDisplay = YES;