OK, I made some progress. In the case of the CGLayer backing, I have
got the problem sorted - in fact passing YES for flipped when creating
the NSGraphicsContext was all that was needed.
I still have the same problem with my NSPDFImageRep though. In this
case I want to make a higher-quality cache than what I can get with
CGLayer (at very high zooms CGLayer's pixellation is unacceptably
obvious). While this cache doesn't gain me much performance over
drawing each object individually, it has some...
Anyhoo, I create this cache using a temporary view and -
dataWithPDFInsideRect:, then make the PDF rep using +imageRepWithData:
If I set the temporary view to return YES for isFlipped, the rep draws
the right way up but exhibits the text problem mentioned. If I set
isFlipped to NO, everything comes out flipped, though text is the
right way up relative to it (i.e. it's all upside down but the text
lines read OK). Again there's no way to set the flipped state of the
rep on its own, and wrapping it in an NSImage makes it draw pixellated
all over again, avoiding which is the whole point of trying to use a
"raw" PDF rep.
I guess that NSLayoutManager is sensing that it's drawing into a PDF
context and doesn't flip the lines in that case?
I guess I could try drawing it (un)flipped using a transform - I'll
give that a go.
G.
On 6 May 2008, at 11:21 am, Graham Cox wrote:
On 6 May 2008, at 11:09 am, Aki Inoue wrote:
NSLayoutManager expects that the coordinate system its rendering
into to be flipped and the current graphics context's -isFlipped to
return YES.
I thought that was the case.
How are you rendering into these contexts ?
The contexts are created in two ways, depending on the kind of cache
I use (though both have the same result). In the case of a CGLayer,
I use CGLayerCreateWithContext based on the current context (the
flipped view), then use the returned layer context to make an
NSGraphicsContext. At that point I set flipped to NO. Reason?
because if I set it to YES ALL of my other content comes out flipped
(because the original view is flipped, two flips would be wrong). If
there were a way to set it flipped *after* rendering the content
that might do it, but there is no setFlipped: method on
NSGraphicsContext, I only get one opportunity to set it, and that's
right up front before I can render into it.
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