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

[Doug Simons]

Follow-up Comment #3, bug #25943 (project gnustep):

That gets me past my call to lockFocus, but it seems something is still
missing. I now crash a few lines later in a call to [NSBitmapImageRep
initWithFocusedViewRect:]. Here is the relevant portion of the gdb
transcript:

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb692ab90 (LWP 27413)]
0xb6f8f6a8 in -[ARTGState(ReadRect) GSReadRect:] (self=0x954fe98,
_cmd=0xb6f9ab58, r=
        {origin = {x = 0, y = 0}, size = {width = 54, height = 17}}) at
ReadRect.m:79
79        if (x0 > wi->sx) x0 = wi->sx;
(gdb) bt
#0  0xb6f8f6a8 in -[ARTGState(ReadRect) GSReadRect:] (self=0x954fe98,
_cmd=0xb6f9ab58, r=
        {origin = {x = 0, y = 0}, size = {width = 54, height = 17}}) at
ReadRect.m:79
#1  0xb6f29e7e in -[GSContext(NSGraphics) GSReadRect:] (self=0x86848c0,
_cmd=0xb7eadc88, rect=
        {origin = {x = 0, y = 0}, size = {width = 54, height = 17}}) at
GSContext.m:878
#2  0xb7c6e3ee in -[NSBitmapImageRep initWithFocusedViewRect:]
(self=0x9120698, _cmd=0x81def58, rect=
        {origin = {x = 0, y = 0}, size = {width = 54, height = 17}}) at
NSBitmapImageRep.m:354
#3  0x080e8e8b in +[TestScriptImage generateTextImageWithAttributes:]
(self=0x81de760, _cmd=0x81dec30, 
    attributes=0x92ee388) at TestScriptImage.m:698
#4  0x080e383d in +[TestScriptImage
makeTestScriptTextImageForFullAttributes:usingPlatform:] (
    self=0x81de760, _cmd=0x81ce070, fullAttributes=0x92ee388,
textPlatformDict=0x955aeb8)
    at TestScriptImage.m:215
(gdb) p wi
$3 = (class XWindowBuffer *) 0x0
(gdb) f 3
#3  0x080e8e8b in +[TestScriptImage generateTextImageWithAttributes:]
(self=0x81de760, _cmd=0x81dec30, 
    attributes=0x92ee388) at TestScriptImage.m:698
698                     textBitmapImage = [[[NSBitmapImageRep alloc]
initWithFocusedViewRect:NSMakeRect(0,0,stringSize.width,stringSize.height)]
autorelease];
(gdb) l
693             [[simpleWindow contentView] lockFocus];
694             NS_DURING {
695                     [bgColor set];
696                     [NSBezierPath
fillRect:NSMakeRect(0,0,stringSize.width,stringSize.height)]; 
697                     [generatedString drawAtPoint:NSMakePoint(1,0)];
698                     textBitmapImage = [[[NSBitmapImageRep alloc]
initWithFocusedViewRect:NSMakeRect(0,0,stringSize.width,stringSize.height)]
autorelease];
699             }
700             NS_HANDLER {
701                     NSLog(@"Exception trying to generate text image: %@", 
localException);
702                     [[simpleWindow contentView] unlockFocus];

The lockFocus at line 693 works fine now, but I'm still not able to draw into
the new context and extract the drawn image.



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