[cairo] Program logic for interactive usage
cworth at cworth.org
Wed Mar 19 15:36:46 PDT 2008
On Wed, 19 Mar 2008 13:25:39 +0200, Hakki Dogusan wrote:
> - create a stationary context in program startup
> mastersurface = cairo_image_surface_create(CAIRO.FORMAT_ARGB32,
> width, height)
> mastercontext = cairo_create(mastersurface)
From your description it doesn't sound like you need mastersurface to
be an *image* surface. So your program may be more efficient if you
instead use cairo_surface_create_similar here, (and pass to it a
surface that's targeting your window system---perhaps by calling
cairo_get_target after your "create a context for paint DC").
> - HitTest in Mouse events
> for each master-shape's path:
> cairo_append_path(mastercontext, path)
> result = cairo_in_fill(mastercontext, x, y)
The cairo_in_fill call is correct, but fairly expensive. As an
optimization, you might want to add some bounding-box based bailouts
to avoid having to call cairo_in_fill when it will obviously return
> Is my logic reasonable?
Seems fine to me. Is everything working well for you?
I hope you're having fun with cairo,
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Size: 189 bytes
Desc: not available
Url : http://lists.cairographics.org/archives/cairo/attachments/20080319/06af90f2/attachment.pgp
More information about the cairo