[mahrz]

I want to draw two (or more) NSBitmapImageRep (initialized with jpegs) into another NSBitmapImageRep which is created on the fly using the "initWithBitmapDataPlanes" method. One possibility to do this is creating a core graphics context, core graphics image references and draw them into the context. But I don't like pure c code in my app and would like to know if there's any way to get a NSGraphicsContext from a NSImageRep ? Then I could use the NSImageReps draw method ....

Any ideas ?

[ 05-25-2002: Message edited by: mahrz ]

[smeger]

Create a new NSImage, send it a lockFocus, draw your two NSBitmapImageReps into it, and unlock focus. Now, you've got an NSImage that contains a private subclass of NSImageRep (it's a cached representation). You can get this into an NSBitmapImageRep by again locking focus on your NSImage and initing an NSBitmapImageRep using the initWithFocusedRect method.

Use TIFFRepresentation to get jpg data back out again.

(disclaimer - this is all from memory, I may have gotten names totally freakin' wrong)

[mahrz]

Originally posted by smeger:
<STRONG>Create a new NSImage, send it a lockFocus, draw your two NSBitmapImageReps into it, and unlock focus. Now, you've got an NSImage that contains a private subclass of NSImageRep (it's a cached representation). You can get this into an NSBitmapImageRep by again locking focus on your NSImage and initing an NSBitmapImageRep using the initWithFocusedRect method.

Use TIFFRepresentation to get jpg data back out again.

(disclaimer - this is all from memory, I may have gotten names totally freakin' wrong)</STRONG>

Is the current graphics context the context of the image when I call lockFocus ?