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[bug #25943] Error trying to lock focus in offscreen window

From: Doug Simons
Subject: [bug #25943] Error trying to lock focus in offscreen window
Date: Fri, 20 Mar 2009 18:31:29 +0000
User-agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_4_11; en) AppleWebKit/525.27.1 (KHTML, like Gecko) Version/3.2.1 Safari/525.27.1 
URL:
  <http://savannah.gnu.org/bugs/?25943>

                 Summary: Error trying to lock focus in offscreen window
                 Project: GNUstep
            Submitted by: theeggcamefirst
            Submitted on: Fri 20 Mar 2009 06:31:27 PM GMT
                Category: Gui/AppKit
                Severity: 3 - Normal
              Item Group: Bug
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any

    _______________________________________________________

Details:

I have the following two lines in my code. The lockFocus causes an exception
inserting nil into an array.

NSWindow *simpleWindow = [[[NSWindow alloc]
       
initWithContentRect:NSMakeRect(0,0,stringSize.width,stringSize.height)
        styleMask:NSBorderlessWindowMask 
        backing:NSBackingStoreNonretained
        defer:NO] autorelease];
[[simpleWindow contentView] lockFocus];

The following gdb transcript may be helpful. The window's frame gets set to
some odd values which looks suspicious but I'm guessing may be an unrelated
problem. I am executing this code in a background thread as you can see below.
I wonder if the fact this is a borderless window or is nonretained has
anything to do with it. This same code works fine in Cocoa.

688             NSWindow *simpleWindow = [[[NSWindow alloc]
initWithContentRect:NSMakeRect(0,0,stringSize.width,stringSize.height)
689                                                     
styleMask:NSBorderlessWindowMask 
690                                                     
backing:NSBackingStoreNonretained
691                                                     defer:NO] autorelease];
(gdb) p stringSize
$22 = {width = 54, height = 17}
(gdb) n
693             [[simpleWindow contentView] lockFocus];
(gdb) p [simpleWindow frame]
$23 = {origin = {x = -1.38111977e-41, y = 0}, size = {width = 53.9999847,
height = 16.9999981}}
(gdb) s
-[NSWindow contentView] (self=0x857e660, _cmd=0x81dde30) at NSWindow.m:1103
1103      return _contentView;
(gdb) 
1104    }
(gdb) 
-[NSView lockFocus] (self=0x896e5d8, _cmd=0x81dde38) at NSView.m:2178
2178      [self lockFocusInRect: [self visibleRect]];
(gdb) s
-[NSView visibleRect] (self=0x896e5d8, _cmd=0xb7f392e0) at NSView.m:2505
2505      if ([self isHiddenOrHasHiddenAncestor])
(gdb) fin
Run till exit from #0  -[NSView visibleRect] (self=0x896e5d8,
_cmd=0xb7f392e0) at NSView.m:2505
0xb7dd806a in -[NSView lockFocus] (self=0x896e5d8, _cmd=0x81dde38) at
NSView.m:2178
2178      [self lockFocusInRect: [self visibleRect]];
Value returned is $24 = 
    {origin = {x = 0, y = 2.86850845e-05}, size = {width = 53.9999847, height
= 16.9999981}}
(gdb) s
-[NSView lockFocusInRect:] (self=0x896e5d8, _cmd=0xb7f39648, rect=
        {origin = {x = 0, y = 2.86850845e-05}, size = {width = 53.9999847,
height = 16.9999981}})
    at NSView.m:2173
2173      [self _lockFocusInContext: nil inRect: rect];
(gdb) 
-[NSView _lockFocusInContext:inRect:] (self=0x896e5d8, _cmd=0xb7f39640,
ctxt=0x0, rect=
        {origin = {x = 0, y = 2.86850845e-05}, size = {width = 53.9999847,
height = 16.9999981}})
    at NSView.m:1917
1917      int window_gstate = 0;
(gdb) 
1919      if (viewIsPrinting == nil)
(gdb) 
1921          NSAssert(_window != nil, NSInternalInconsistencyException);
(gdb) 
1923          if ((window_gstate = [_window gState]) == 0)
(gdb) n
1929      if (ctxt == nil)
(gdb) 
1931          if (viewIsPrinting != nil)
(gdb) 
1939              ctxt = [_window graphicsContext];
(gdb) 
1944      [NSGraphicsContext saveGraphicsState];
(gdb) po ctxt
<ARTContext: 0x898f720>
(gdb) s
+[NSGraphicsContext saveGraphicsState] (self=0xb7ede300, _cmd=0xb7f395b0) at
NSGraphicsContext.m:253
253       NSMutableDictionary *dict = [[NSThread currentThread]
threadDictionary];
(gdb) n
254       NSMutableArray *stack = [dict objectForKey:
NSGraphicsContextStackKey];
(gdb) po dict
{}
(gdb) info thread
* 11 Thread 0xb5fffb90 (LWP 4377)  +[NSGraphicsContext saveGraphicsState]
(self=0xb7ede300, _cmd=0xb7f395b0)
    at NSGraphicsContext.m:254
  10 Thread 0xb6a51b90 (LWP 4376)  0xb7f7c410 in __kernel_vsyscall ()
  1 Thread 0xb71f08c0 (LWP 4367)  0xb7f7c410 in __kernel_vsyscall ()
(gdb) n
255       if (stack == nil)
(gdb) 
257           stack = [[NSMutableArray allocWithZone: _globalGSZone] init];
(gdb) 
258           [dict setObject: stack forKey: NSGraphicsContextStackKey];
(gdb) 
260       ctxt = GSCurrentContext();
(gdb) 
261       [ctxt saveGraphicsState];
(gdb) po ctxt
Cannot access memory at address 0x0
(gdb) n
262       [stack addObject: ctxt];
(gdb) 

688             NSWindow *simpleWindow = [[[NSWindow alloc]
initWithContentRect:NSMakeRect(0,0,stringSize.width,stringSize.height)
689                                                     
styleMask:NSBorderlessWindowMask 
690                                                     
backing:NSBackingStoreNonretained
691                                                     defer:NO] autorelease];
(gdb) p stringSize
$22 = {width = 54, height = 17}
(gdb) n
693             [[simpleWindow contentView] lockFocus];
(gdb) p [simpleWindow frame]
$23 = {origin = {x = -1.38111977e-41, y = 0}, size = {width = 53.9999847,
height = 16.9999981}}
(gdb) s
-[NSWindow contentView] (self=0x857e660, _cmd=0x81dde30) at NSWindow.m:1103
1103      return _contentView;
(gdb) 
1104    }
(gdb) 
-[NSView lockFocus] (self=0x896e5d8, _cmd=0x81dde38) at NSView.m:2178
2178      [self lockFocusInRect: [self visibleRect]];
(gdb) s
-[NSView visibleRect] (self=0x896e5d8, _cmd=0xb7f392e0) at NSView.m:2505
2505      if ([self isHiddenOrHasHiddenAncestor])
(gdb) fin
Run till exit from #0  -[NSView visibleRect] (self=0x896e5d8,
_cmd=0xb7f392e0) at NSView.m:2505
0xb7dd806a in -[NSView lockFocus] (self=0x896e5d8, _cmd=0x81dde38) at
NSView.m:2178
2178      [self lockFocusInRect: [self visibleRect]];
Value returned is $24 = 
    {origin = {x = 0, y = 2.86850845e-05}, size = {width = 53.9999847, height
= 16.9999981}}
(gdb) s
-[NSView lockFocusInRect:] (self=0x896e5d8, _cmd=0xb7f39648, rect=
        {origin = {x = 0, y = 2.86850845e-05}, size = {width = 53.9999847,
height = 16.9999981}})
    at NSView.m:2173
2173      [self _lockFocusInContext: nil inRect: rect];
(gdb) 
-[NSView _lockFocusInContext:inRect:] (self=0x896e5d8, _cmd=0xb7f39640,
ctxt=0x0, rect=
        {origin = {x = 0, y = 2.86850845e-05}, size = {width = 53.9999847,
height = 16.9999981}})
    at NSView.m:1917
1917      int window_gstate = 0;
(gdb) 
1919      if (viewIsPrinting == nil)
(gdb) 
1921          NSAssert(_window != nil, NSInternalInconsistencyException);
(gdb) 
1923          if ((window_gstate = [_window gState]) == 0)
(gdb) n
1929      if (ctxt == nil)
(gdb) 
1931          if (viewIsPrinting != nil)
(gdb) 
1939              ctxt = [_window graphicsContext];
(gdb) 
1944      [NSGraphicsContext saveGraphicsState];
(gdb) po ctxt
<ARTContext: 0x898f720>
(gdb) s
+[NSGraphicsContext saveGraphicsState] (self=0xb7ede300, _cmd=0xb7f395b0) at
NSGraphicsContext.m:253
253       NSMutableDictionary *dict = [[NSThread currentThread]
threadDictionary];
(gdb) n
254       NSMutableArray *stack = [dict objectForKey:
NSGraphicsContextStackKey];
(gdb) po dict
{}
(gdb) info thread
* 11 Thread 0xb5fffb90 (LWP 4377)  +[NSGraphicsContext saveGraphicsState]
(self=0xb7ede300, _cmd=0xb7f395b0)
    at NSGraphicsContext.m:254
  10 Thread 0xb6a51b90 (LWP 4376)  0xb7f7c410 in __kernel_vsyscall ()
  1 Thread 0xb71f08c0 (LWP 4367)  0xb7f7c410 in __kernel_vsyscall ()
(gdb) n
255       if (stack == nil)
(gdb) 
257           stack = [[NSMutableArray allocWithZone: _globalGSZone] init];
(gdb) 
258           [dict setObject: stack forKey: NSGraphicsContextStackKey];
(gdb) 
260       ctxt = GSCurrentContext();
(gdb) 
261       [ctxt saveGraphicsState];
(gdb) po ctxt
Cannot access memory at address 0x0
(gdb) n
262       [stack addObject: ctxt];
(gdb) 






    _______________________________________________________

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