objective c - Huge memory usage despite ARC -



i have following function opens image, scales , saves file.

-(void)writefiletoicon:(nsstring *)fullpath :(nsstring *)finalpath :(nssize)outputsize {     nsdata *datatowrite;     nsbitmapimagerep *rep;      rep = [nsbitmapimagerep imagerepwithdata:[[self scaleimage:[[nsimage alloc]initwithcontentsoffile:fullpath] tosize:outputsize] tiffrepresentation]];     datatowrite = [rep representationusingtype:nspngfiletype properties:nil];     [datatowrite writetofile:finalpath atomically:yes]; }  - (nsimage *)scaleimage:(nsimage *)image tosize:(nssize)targetsize {     if ([image isvalid])     {         nssize imagesize = [image size];         float width  = imagesize.width;         float height = imagesize.height;         float targetwidth  = targetsize.width;         float targetheight = targetsize.height;         float scalefactor  = 0.0;         float scaledwidth  = targetwidth;         float scaledheight = targetheight;          nspoint thumbnailpoint = nszeropoint;          if (!nsequalsizes(imagesize, targetsize))         {             float widthfactor  = targetwidth / width;             float heightfactor = targetheight / height;              if (widthfactor < heightfactor)             {                 scalefactor = widthfactor;             }             else             {                 scalefactor = heightfactor;             }              scaledwidth  = width  * scalefactor;             scaledheight = height * scalefactor;              if (widthfactor < heightfactor)             {                 thumbnailpoint.y = (targetheight - scaledheight) * 0.5;             }              else if (widthfactor > heightfactor)             {                 thumbnailpoint.x = (targetwidth - scaledwidth) * 0.5;             }              nsimage *newimage = [[nsimage alloc] initwithsize:nsmakesize(scaledwidth, scaledheight)];              [newimage lockfocus];              nsrect thumbnailrect;             thumbnailrect.origin = nszeropoint;             thumbnailrect.size.width = scaledwidth;             thumbnailrect.size.height = scaledheight;              [image drawinrect:thumbnailrect                      fromrect:nszerorect                     operation:nscompositesourceover                      fraction:1.0];              [newimage unlockfocus];             return newimage;         }         return nil;     }     return nil; }

however each time function called, memory usage getting higher (up 5 gb 1000 calls).
issue drawrect function seems take lot of memory (according analyser) not release it.
how can "ask" arc release ?

thanks.

one may need @ whole code find problem. 1 idea follows, though: under arc cannot call "release" on objects, if set pointer object "nil", object released (unless other strong references object exist somewhere).

i suggest track code , make sure don't hold objects don't need anymore. if code encapsulated , structured, shouldn't happen.

if code designed, though, there chance amount of memory needed (unlikely, don't know without more details). if case, let system manage memory, release objects when appropriate. this, , try make optimizations somewhere if memory usage concern.

off-topic: these long nested if's multiple return points within method not idea; suggest reestructure code slightly. if write clearer code, you'll have more control on it, , find solutions problems faster.


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