Re: Problems with NSGraphicsContext
Re: Problems with NSGraphicsContext
- Subject: Re: Problems with NSGraphicsContext
- From: John Curtis <email@hidden>
- Date: Tue, 28 Feb 2006 22:50:33 +0000
Aki,
Upon investigation using this code:
//////////////////////////
NSBitmapImageRep* image = [[NSBitmapImageRep alloc] initWithData:
[NSData dataWithContentsOfFile:str]];
NSLog(@"Number of planes %d", [image numberOfPlanes]);
if([image isPlanar]){
NSLog(@"The image is planar");
}else{
NSLog(@"The image is non planar");
}
//////////////////////////
I find that the image is non planar and has 1 plane. I think that
CGBitmapContext coveres a JPEG format, which is the file that the
image has been instantiated with.
Is there anything else that might cause such a problem?
Thanks,
John
On 28 Feb 2006, at 22:40, Aki Inoue wrote:
John,
Currently the method supports only non-planar NSBitmapImageRep with
formats covered by CGBitmapContext.
See http://graphics.apple.com/Documents/CGBitmapContext.html for
supported formats.
Aki
Hello,
I am trying to instantiate a NSGraphicsContext with an
NSBitmapImageRep but the method:
[NSGraphicsContext graphicsContextWithBitmapImageRep:myImageRep]
keeps returning nil for no reason that I can see. The object
myImageRep works fine, I am sure of that. I use it in the
following context:
NSGraphicsContext* graphics = [[NSGraphicsContext
graphicsContextWithBitmapImageRep:myImageRep] retain];
Does anyone know under what reasons would this method return nil
if there is no problem with the NSBitmapImageRep?
Thanks
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