Re: Problem with preview and the blocking print dialog

On Wed, 2006-05-10 at 17:52 -0500, Federico Mena Quintero wrote:
> On Wed, 2006-05-10 at 18:26 -0400, John (J5) Palmieri wrote:
> > One of the issues with cairo is that we would have to either run through
> > the drawing commands on every expose event or save out to a bitmaps
> > surface which would remove the ability to zoom.
> The canvas runs through the drawing commands on every expose event :)
> If you use canvas groups to take advantage of recursive bounding boxes,
> it can be quite efficient.

But is the canvas part of gtk+?

> For efficient exposures... I don't know how Cairo stores things
> internally, but it shouldn't be too hard to add bounding box info for
> those replay-able commands.
> In any case, you only need to replay on the first expose event; you can
> create a pixmap then that you use for further exposes.  You only need to
> replay to a new pixmap when you change the zoom factor --- isn't this
> essentially what Evince does?

Yes we can do this.  It was my first thought.  It is not off the table

John (J5) Palmieri <johnp redhat com>

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