Re: cutting an image into multiple images

FROM : douglas a. welton
DATE : Sat Jun 21 23:41:54 2008

Depending on what you are going to do with the "sub-images" once you 
create them, you might want to consider using a CIImage with the 
CICrop core image filter.

On Jun 21, 2008, at 9:41 AM, Dharmendra wrote:

> Hi,
> I am trying to get a user-defined image in specific format (m x nm) 
> and want
> to generate an array with count n containing m x m sized images. I 
> have
> written the following code, but would like to know if there is 
> better way to
> do the same:
>
> m=...;
>
> NSImage *userImage=[[NSImage alloc] 
> initWithContentsOfFile:@"xxx.gif"];
>
> unsigned int n=[userImage size].width/m;
>
> NSMutableArray *images = [NSMutableArray arrayWithCapacity:n];
>
> for(i=0;i<n;i++) {
>
> NSImage *testImage=[[NSImage alloc] initWithSize:NSMakeSize(m,m)];
>
> [testImage lockFocus];
>
> [userImage drawInRect:NSMakeRect(0,0,m,m) fromRect:NSMakeRect(m*i,
> 0,m,m)
> operation:NSCompositeSourceOver fraction:1.0];
>
> [testImage unlockFocus];
>
> [images addObject:testImage];
>
> }
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