Re: saving big image crashes
Re: saving big image crashes
- Subject: Re: saving big image crashes
- From: "John C. Randolph" <email@hidden>
- Date: Wed, 24 Nov 2004 04:13:41 -0800
It sounds like you're running into the limitations of NSBitmapImageRep.
You should file a bug on this, since we shouldn't crash just because
an image is very large.
For an image this big, you'll need to do your own memory management for
the image data. What I would do in this situation, is use an
NSCustomImageRep, which will ask its delegate to draw portions of the
image. Your custom image rep's delegate should handle the mapping of
your raw data to its visual representation.
-jcr
On Nov 23, 2004, at 9:30 PM, 김경옥 wrote:
Hi,
I'm implementing a cocoa application in Obj-C for editing images.
Users can resize image in pixels using the application.
When I resize 450 x 300(pixels) image to 9000 x 9000 and save it with
new size,
the new image is saved but the application crashes during reopening
the resized image with a message as follows:
----------------------------------------------------------
*** malloc:vm_allocate(size=24307324) fail (error code=3)
*** malloc[874]: error:Can't allocate region
Executable "application" has exited due to signal 10 (SIGBUS).
----------------------------------------------------------
The point the application crashes is the line as follows:
aImage = [[NSImage alloc] initWithData:[newImage TIFFRepresentation]];
And when I resize the same image to 10000 x 10000 and save it with new
size,
the application crashes during the new image is saved.
The program is abnoramlly exited at the line of code without any error
code as follows:
TiffRef = [[NSBitmapImageRep alloc] initWithData:[temp_image
TIFFRepresentation]];
the temp_image is resized image.
How can I solve momory problem with big images?
Any help is greatly appreciated.
John C. Randolph <email@hidden> (408) 974-8819
Sr. Cocoa Software Engineer,
Apple Worldwide Developer Relations
http://developer.apple.com/cocoa/index.html
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