Re: Very confused with pixbufs, pixmaps, images, rgbs and drawables

[Rick <graham rick gmail com>]

Thanks for clearing that up, I was vague on this too.  Now I have a
small app that loads an image then messes with it directly.

Fun, and removes a hurdle for me.

On 8/8/05, John Cupitt <jcupitt gmail com> wrote:
> A lot of the names come from Xlib and ancient history.
> 
> On 8/8/05, Chris Seaton <chris chrisseaton com> wrote:
> > GdkPixmap - server side pixel map
> > GdkBitmap - server side pixel map, 1bpp
> 
> Bingo! Exactly right. Names from X history. Bitmap was the original,
> pixmap was added later when the first colour displays appeared. They
> are close to the hardware, so they have a bunch of extra stuff like
> visuals and colormaps associated with them.
> 
> > GdkPixbuf - client side pixel map
> 
> The big thing here is that pixbuf is not so close to the hardware.
> It's just a 24 bit RGB buffer (they have some hooks for other colour
> spaces, but I don't know if there are plans to add them).
> 
> Pixbuf is a nice clean (fairly) high level API added by the gtk team
> that hides client-side complexity from you.
> 
> > GdkImage - not really sure, but it says it's redundant to GdkRGB
> 
> XImage is what used to be used for client-side images. It is close to
> the hardware and changes annoying between different displays. Just
> awful to work with, avoid it if you possibly can.
> 
> > GdkRGB - seems to render raw pixel data from a simple pointer
> 
> This is (sort of) the thing GdkPixbuf uses to hide the insides of
> GdkImage from you. You can (sometimes) get a little speed by using it
> directly, but usually you should go through GdkPixbuf.
> 
> > Is that right? Please set me straight. What are they all for? And which
> > do I want to solve my problem in the first paragraph?
> 
> Summary: use GdkPixbuf client-side and GdkPixmap server-side.
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-- 
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Cheers!
Rick