Re: GWorkspace.app Feature Request-- Tabbed Shelf

[Enrico Sersale]

On 2003-06-25 09:10:51 +0300 Nicolas Roard <nicolas@roard.com> wrote:

> On 2003-06-24 22:55:28 +0000 Fred Kiefer <fredkiefer@gmx.de> wrote:
>
> > Hi Nicolas,
> >
> > this doesn't sound like an evil hack, rather like a very nice idea that should 
> > make it into NSWorkspace. Please clean up that code and commit it.
> >
> > Fred
>
> Hm I just looked back on my hard disk but I think I don't have it anymore
> (I changed of computer since I wrote that).
> It was really a matter of a few lines, as it only looked if a file existed, and
> tried to create a NSImage with it in order to return it (else the default 
> NSImage
> was returned).
> The idea was simply to construct a file's path by adding a .tiff extension on 
> it, and
> modify the provided path (iconForFile:) to add a .thumbnail/ before it.   
> NSWorkspace didn't had the responsability of creating the thumbnails, as I 
> thought
> it wasn't its duty at all (*bloat*). It should just return them if they exist.
> So for my test I created "by hand" the thumbnails.
> Ideally GWorkspace or other software could create automatically thoses 
> thumbnails.
> It should be good to use the freedesktop specs about thumbnails if possible.

Well, I'm writing the part that should create the thumbnails.
There are some problems:
We have two images, img1 read from the disk and img2 created with 
-initWithSize:.
To have a thumbnail sized image I do something like this (pratically it is a 
little more complex):

 [img1 setSize: newSize];
 [img2 lockFocus];
 [[NSColor clearColor] set];
 NSRectFill(NSMakeRect(0, 0, 48,48);
 [img1 drawInRect: targetRect];
 [img2 unlockFocus];

now img2 is a 48x48 copy of img1.
The problem is that this new image can be displayed but can't be saved, it has 
only a NSCacheImageRep, not a NSBitmapImageRep, and I've not access to its data 
(with -TIFFRepresentation, for example).
Theorically there is a NSBitmapImageRep method, -initWithFocusedViewRect:, that 
should let me do something like this:

 NSBitmapImageRep *rep;
 NSData *data;

 [img2 lockFocus];
 rep = [[NSBitmapImageRep alloc] initWithFocusedViewRect: NSMakeRect(0, 0, 48, 
48)];
 [img2 unlockFocus];
  data = [rep TIFFRepresentation];
 etc., etc., etc.

But -initWithFocusedViewRect: is not implemented in GNUstep.
Somebody can suggest an alternative?