I have an issue where using NSLayoutManager's
setDefaultAttachmentScaling:NSImageScaleProportionallyDown doesn't seem to work
if I setup my own NSGraphicsContext + CGPDFContext.
The problem is that large inline images are not scaled down when drawn like
they would be in an NSTextView. Text after the image is positioned as if it
was scaled though, so I end up with text that is drawn over an image.
Here's the abbreviated code for what I'm doing:
.. make a CGPDFContext "ctx", wrap it up in a flipped NSGraphicsContext
.. load an NSTextStorage "contents" up with my RTFD file
NSLayoutManager *layoutManager = [[[NSLayoutManager alloc] init] autorelease];
[contents addLayoutManager:layoutManager];
[layoutManager setDefaultAttachmentScaling:NSImageScaleProportionallyDown];
BOOL clipped = NO;
do {
CGContextBeginPage(ctx, &box);
CGContextTranslateCTM( ctx, 0, box.size.height);
CGContextScaleCTM(ctx, 1.0, -1.0 );
NSTextContainer *textContainer = [[[NSTextContainer alloc]
initWithContainerSize:box.size] autorelease];
[layoutManager addTextContainer:textContainer];
[layoutManager ensureLayoutForTextContainer:textContainer];
NSRange glyphRange = [layoutManager
glyphRangeForTextContainer:textContainer];
NSRange charRange = [layoutManager characterRangeForGlyphRange:glyphRange
actualGlyphRange:nil];
[layoutManager drawGlyphsForGlyphRange:glyphRange atPoint:NSZeroPoint];
clipped = (NSMaxRange(charRange) < [contents length]);
CGContextEndPage(ctx);
}
while (clipped);
.. cleanup
I've got some very simple sample code which reproduces the behavior here:
http://gusmueller.com/stuff/NSLayoutImageScalingPDFProblem.zip
Can anyone shed some light on what I'm doing wrong?
This is on 10.7.2 btw.
thanks,
-gus
--
August 'Gus' Mueller
Flying Meat Inc.
http://flyingmeat.com/
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