Hi Tresa,
This isn't enough information to tell what might be going wrong.
Please file a bug, and give steps to reproduce in your app. (Or a
reduction, but it sounds like you don't know how to make a reduction here.)
I'm not aware of any problem that would cause this.
You might try replacing your image drawing with NSRectFill of a color to
make sure the drawing is targeted where you think it is.
-ken
On Wed, Sep 9, 2009 at 10:51 AM, <tr...@atheeva.com> wrote:
> Hello,
> I seem to be running into an issue on Snow Leopard with NSImage.
> Basically , I have a thumbnail kind of view , shown as a sheet , to
> which I render the images read from the disk. The problem is that on
> Snow Leopard the image shows up as blank whereas it renders fine on
> Leopard and Tiger. My app is a Cocoa universal app running on an Intel
> MacMini.The code goes like this ..
>
> - (void)drawRect:(NSRect)rect {
>
> [_timg drawInRect:imageRect fromRect:NSZeroRect
> operation:NSCompositeSourceOver fraction:1.0f]; // _timg is an NSImage
> /* Debug Code to see if the data in _timg is ok */
> NSData* tiffData = [_timg TIFFRepresentation];
> [tiffData writeToFile:[NSString stringWithFormat:@"Debug.tiff"]
> atomically:NO];
> }
>
> What I have noticed :
> - If I comment the drawInRect call... the debug code to write to a file
> generates a properly rendered image on disk.This implies that the data is
> not messed up due to any program issues
> - If the call to drawInRect is included , the file rendered as well as the
> rendered image on screen is white..so the source image seems to be getting
> modified.
> - Similar calls to drawInRect elsewhere in the app does not seem to have
> this issue. The only noticeable difference seems to be that the code which
> is not working is invoked as a sheet.
> - Changing the "operation" arguments to NSCompositeCopy etc does not make
> any difference.
>
> Please let me know any workarounds or possible solutions for this problem.
> Thanks in advance,
> Tresa
>
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