Re: altering an NSImage by access to pixels

2011-08-18 Thread James Walker
On 8/18/2011 4:23 PM, David Duncan wrote: On Aug 18, 2011, at 4:16 PM, James Walker wrote: Let's say I have an NSImage that contains some representation other than an NSBitmapImageRep, and I want to play with the pixel values. Create your NSBitmapImageRep Create a NSGraphicsContext from tha

Re: altering an NSImage by access to pixels

2011-08-18 Thread David Duncan
On Aug 18, 2011, at 4:31 PM, The Karl Adam wrote: > Hey David, > Why not just use the CGDataProviderCopyData(CGImageGetDataProvider(imageRef)) > to create a new NSBitmapImageRequest with the image's original data? Is > drawing it more performant or gives you a better more compact data > represe

Re: altering an NSImage by access to pixels

2011-08-18 Thread Kyle Sluder
On Thu, Aug 18, 2011 at 4:23 PM, David Duncan wrote: > On Aug 18, 2011, at 4:16 PM, James Walker wrote: > >> Let's say I have an NSImage that contains some representation other than an >> NSBitmapImageRep, and I want to play with the pixel values. > > > Create your NSBitmapImageRep > Create a NSG

Re: altering an NSImage by access to pixels

2011-08-18 Thread The Karl Adam
Hey David, Why not just use the CGDataProviderCopyData(CGImageGetDataProvider(imageRef)) to create a new NSBitmapImageRequest with the image's original data? Is drawing it more performant or gives you a better more compact data representation? _Karl On Thu, Aug 18, 2011 at 4:23 PM, David Duncan

Re: altering an NSImage by access to pixels

2011-08-18 Thread David Duncan
On Aug 18, 2011, at 4:26 PM, Kyle Sluder wrote: > I'd point you at the Snow Leopard AppKit release notes, which contain a very > long discussion about this topic (presumably written by David), but it seems > there are only the Lion and Leopard versions available online. :( I can't take credit

Re: altering an NSImage by access to pixels

2011-08-18 Thread David Duncan
On Aug 18, 2011, at 4:16 PM, James Walker wrote: > Let's say I have an NSImage that contains some representation other than an > NSBitmapImageRep, and I want to play with the pixel values. Create your NSBitmapImageRep Create a NSGraphicsContext from that rep and make it current Draw your NSImag

altering an NSImage by access to pixels

2011-08-18 Thread James Walker
Let's say I have an NSImage that contains some representation other than an NSBitmapImageRep, and I want to play with the pixel values. My plan was like this: Create a NSBitmapImageRep of the same size as my source image. Make a new NSImage and add my new representation to it. Lock focus on th