Commit Graph

9 Commits

Author SHA1 Message Date
Emmanuele Bassi
264c67c2aa canvas: Allow invalidating the content along with the size
Currently, clutter_canvas_set_size() causes invalidation of the canvas
contents only if the newly set size is different. There are cases when
we want to invalidate the content regardless of the size set, but we
cannot do that right now without possibly causing two invalidations,
for instance:

  clutter_canvas_set_size (canvas, new_width, new_height);
  clutter_content_invalidate (canvas);

will cause two invalidations if the newly set size is different than
the existing one. One way to work around it is to check the current
size of the canvas and either call set_size() or invalidate() depending
on whether the size differs or not, respectively:

  g_object_get (canvas, "width", &width, "height", &height, NULL);
  if (width != new_width || height != new_height)
    clutter_canvas_set_size (canvas, new_width, new_height);
  else
    clutter_content_invalidate (canvas);

this, howevere, implies knowledge of the internals of ClutterCanvas,
and of its optimizations — and encodes a certain behaviour in third
party code, which makes changes further down the line harder.

We could remove the optimization, and just issue an invalidation
regardless of the surface size, but it's not something I'd be happy to
do. Instead, we can add a new function specifically for ClutterCanvas
that causes a forced invalidation regardless of the size change. If we
ever decide to remove the optimization further down the road, we can
simply deprecate the function, and make it an alias of invalidate()
or set_size().
2013-05-06 10:03:54 -07:00
Emmanuele Bassi
725f4a07f3 canvas: Propagate Cairo errors when diagnostic mode is enabled
It can be a useful debugging tool to report the eventual error state of
the cairo_t after the ::draw signal emission ended.
2012-06-14 14:57:28 +01:00
Emmanuele Bassi
c6e1d02fed canvas: Use the actor's content repeat policy
Similarly to what ClutterImage does.
2012-06-08 14:33:00 +01:00
Emmanuele Bassi
07c95ebf0c Move examples from tests/interactive to a new top-level
The example code that is meant to be XIncluded into the API reference
should not be part of the interactive test suite: it's code that it is
meant to be used as a reference implementation - whereas the interactive
test suite should be allowed to be lean and test behaviour even in nasty
ways. In short: the test suite should not be the place where we show off
idiomatic code for educational purposes.
2012-05-01 19:00:35 +01:00
Emmanuele Bassi
e2564dd265 Deprecate ClutterCairoTexture
The ClutterCanvas content implementation should be used instead, to
avoid stringing along the ClutterTexture API and implementation.

This change requires some minor surgery, as the deprecated section
already contains an header for the previously deprecated methods; plus,
we don't want to deprecate clutter_cairo_set_source_color(). This means
creating a new header to be used for Cairo-related API.
2012-04-27 12:28:49 +01:00
Stefano Facchini
2c46baf30c canvas: avoid emission of "draw" signal when the size is zero
This also avoids the warning

  Cogl-WARNING **: ./cogl-buffer.c:215: GL error (1285): Out of memory

generated by cogl_buffer_map when the CoglBuffer has zero length.
2012-03-29 15:14:29 +02:00
Emmanuele Bassi
fb106ece05 Use the content scaling filters
Both ClutterCanvas and ClutterImage should use the minification and
magnification filters set on the actor, just like the use the content
box and the paint opacity.
2012-03-16 12:33:38 +00:00
Emmanuele Bassi
0eeb61f3a8 canvas: Add canvas size to the ::draw signal
Instead of requiring a call to clutter_content_get_preferred_size(), we
can simply pass the canvas size to the Canvas::draw signal.
2012-03-16 12:33:37 +00:00
Emmanuele Bassi
07bb35bbe3 Add ClutterCanvas, a drawing content 2012-03-16 12:33:37 +00:00