Mac Retina fix:

Mouse coordinates were not mapped correctly for code that allows to use
multiple windows efficiently (mouse over not-active windows).

Apple's high-density display mode works a bit strange, requiring some hacks :/

- Desktop coordinate system (mouse pos and for windows) is as usual
  (set by display resolution settings)
- However, the available pixels in a window is always on 'retina' level.
  (full screen - 2880 wide, but window can be 1440 or 1920 wide)

In order to get this to work for opengl and Blender, we use internally the
coordinates on pixel level. That means that window positions and sizes have
to mappend in our code.

Once all issues for retinas have been tackled, I'll check on clean API for 
it, so you can also use it in future for other high density screens.

1 files changed, 13 insertions, 8 deletions

diff --git a/source/blender/windowmanager/intern/wm_event_system.c b/source/blender/windowmanager/intern/wm_event_system.c
index d8dd0ac04c4..e462e21d9f4 100644
--- a/source/blender/windowmanager/intern/wm_event_system.c
+++ b/source/blender/windowmanager/intern/wm_event_system.c
@@ -2689,8 +2689,10 @@ static wmWindow *wm_event_cursor_other_windows(wmWindowManager *wm, wmWindow *wi
 	if (wm->windows.first == wm->windows.last)
 		return NULL;
 	
-	/* top window bar... */
-	if (mx < 0 || my < 0 || mx > win->sizex || my > win->sizey + 30) {
+	/* in order to use window size and mouse position (pixels), we have to use a WM function */
+	
+	/* check if outside, include top window bar... */
+	if (mx < 0 || my < 0 || mx > WM_window_pixels_x(win) || my > WM_window_pixels_y(win) + 30) {
 		wmWindow *owin;
 		wmEventHandler *handler;
 		
@@ -2701,18 +2703,21 @@ static wmWindow *wm_event_cursor_other_windows(wmWindowManager *wm, wmWindow *wi
 				return NULL;
 		
 		/* to desktop space */
-		mx += (int)win->posx;
-		my += (int)win->posy;
+		mx += (int) (U.pixelsize * win->posx);
+		my += (int) (U.pixelsize * win->posy);
 		
 		/* check other windows to see if it has mouse inside */
 		for (owin = wm->windows.first; owin; owin = owin->next) {
 			
 			if (owin != win) {
-				if (mx - owin->posx >= 0 && my - owin->posy >= 0 &&
-				    mx - owin->posx <= owin->sizex && my - owin->posy <= owin->sizey)
+				int posx = (int) (U.pixelsize * owin->posx);
+				int posy = (int) (U.pixelsize * owin->posy);
+				
+				if (mx - posx >= 0 && owin->posy >= 0 &&
+				    mx - posx <= WM_window_pixels_x(owin) && my - posy <= WM_window_pixels_y(owin))
 				{
-					evt->x = mx - (int)owin->posx;
-					evt->y = my - (int)owin->posy;
+					evt->x = mx - (int)(U.pixelsize * owin->posx);
+					evt->y = my - (int)(U.pixelsize * owin->posy);
 					
 					return owin;
 				}