NSATSTypeSetter exception
NSATSTypeSetter exception
- Subject: NSATSTypeSetter exception
- From: "Adam R. Maxwell" <email@hidden>
- Date: Fri, 18 Jan 2008 09:53:12 -0800
I'm seeing the following exception occasionally in my console log, and I suspect it may be due to a quicklook plugin that I'm at least partly responsible for. It uses NSLayoutManager to draw an attributed string. The string drawing code is appended as well, since presumably that's relevant. The attributed string has a mix of fonts and NSTextAttachmentCells, if that matters. Any suggestions would be appreciated.
thanks,
adam
01/18/08 09:21:36 quicklookd[128] <NSATSTypesetter: 0x149580>: Exception *** Collection <NSCFSet: 0x1d6f30> was mutated while being enumerated. raised during typesetting layout manager <NSLayoutManager: 0x1b8150>
1 containers, text backing has 2656 characters
selected character range {1082253312, 0} affinity: upstream granularity: character
marked character range {1082253312, 0}
Currently holding 2656 glyphs.
Glyph tree contents: 2656 characters, 2656 glyphs, 1 nodes, 32 node bytes, 4096 storage bytes, 4128 total bytes, 1.55 bytes per character, 1.55 bytes per glyph
Layout tree contents: 2656 characters, 2656 glyphs, 0 laid glyphs, 0 laid line fragments, 1 nodes, 32 node bytes, 0 storage bytes, 32 total bytes, 0.01 bytes per character, 0.01 bytes per glyph, 0.00 laid glyphs per laid line fragment, 0.00 bytes per laid line fragment
, glyph range {0 21}. Ignoring...
// creates a new NSTextStorage/NSLayoutManager/NSTextContainer system suitable for drawing in a thread
static NSTextStorage *createTextStorage()
{
NSTextStorage *textStorage = [[NSTextStorage alloc] init];
NSLayoutManager *lm = [[NSLayoutManager alloc] init];
NSTextContainer *tc = [[NSTextContainer alloc] init];
[tc setContainerSize:_containerSize];
[lm addTextContainer:tc];
// don't let the layout manager use its threaded layout (see header)
[lm setBackgroundLayoutEnabled:NO];
[textStorage addLayoutManager:lm];
// retained by layout manager
[tc release];
// retained by text storage
[lm release];
// see header; the CircleView example sets it to NO
[lm setUsesScreenFonts:YES];
return textStorage;
}
// assumes that the current NSGraphicsContext is the destination
static void drawAttributedStringInCurrentContext(NSAttributedString *attrString)
{
CGContextRef ctxt = [[NSGraphicsContext currentContext] graphicsPort];
NSTextStorage *textStorage = createTextStorage();
[textStorage beginEditing];
[textStorage setAttributedString:attrString];
[textStorage endEditing];
NSRect stringRect = NSZeroRect;
stringRect.size = _paperSize;
CGContextSaveGState(ctxt);
CGAffineTransform t1 = CGAffineTransformMakeTranslation(_horizontalMargin, _paperSize.height - _verticalMargin);
CGAffineTransform t2 = CGAffineTransformMakeScale(1, -1);
CGAffineTransform pageTransform = CGAffineTransformConcat(t2, t1);
CGContextConcatCTM(ctxt, pageTransform);
// objectAtIndex:0 is safe, since we added these to the text storage (so there's at least one)
NSLayoutManager *lm = [[textStorage layoutManagers] objectAtIndex:0];
NSTextContainer *tc = [[lm textContainers] objectAtIndex:0];
NSRange glyphRange;
// we now have a properly flipped graphics context, so force layout and then draw the text
glyphRange = [lm glyphRangeForBoundingRect:stringRect inTextContainer:tc];
NSRect usedRect = [lm usedRectForTextContainer:tc];
// NSRunStorage raises if we try drawing a zero length range (happens if you have an empty text file)
if (glyphRange.length > 0) {
[lm drawBackgroundForGlyphRange:glyphRange atPoint:usedRect.origin];
[lm drawGlyphsForGlyphRange:glyphRange atPoint:usedRect.origin];
}
CGContextRestoreGState(ctxt);
[textStorage release];
}
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