Fix for iOS touch input coordinates being halved on Retina displays

libsdl-org · Jul 26, 2012 · 58b0ae530181e892fba64b127c83377d616502e1 · 58b0ae5
1 parent 08817dd
commit 58b0ae530181e892fba64b127c83377d616502e1
Unified Split

Showing with 12 additions and 0 deletions.

+12 −0 src/video/uikit/SDL_uikitview.m
diff --git a/src/video/uikit/SDL_uikitview.m b/src/video/uikit/SDL_uikitview.m
@@ -94,6 +94,12 @@ - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
 
     if (touch) {
         CGPoint locationInView = [touch locationInView: self];
+
+        /* Make sure UIView points are converted to screen pixels: */
+        if ([self respondsToSelector:@selector(contentScaleFactor)]) {
+            locationInView.x *= self.contentScaleFactor;
+            locationInView.y *= self.contentScaleFactor;
+        }
 
         /* send moved event */
         SDL_SendMouseMotion(NULL, 0, locationInView.x, locationInView.y);
@@ -184,6 +190,12 @@ - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
 
     if (touch) {
         CGPoint locationInView = [touch locationInView: self];
+
+        /* Make sure UIView points are converted to screen pixels: */
+        if ([self respondsToSelector:@selector(contentScaleFactor)]) {
+            locationInView.x *= self.contentScaleFactor;
+            locationInView.y *= self.contentScaleFactor;
+        }
 
         /* send moved event */
         SDL_SendMouseMotion(NULL, 0, locationInView.x, locationInView.y);