From [the spec](https://www.w3.org/TR/css-backgrounds-3/#shadow-blur):
> the resulting shadow must approximate (with each pixel being within 5%
> of its expected value) the image that would be generated by applying to
> the shadow a Gaussian blur with a standard deviation [sigma] equal to
> half the blur radius
This does not change the value of `sigma`, it only corrects the value of
`sampling_radius` used to size the shadow texture. Since the texture is
no longer being slightly oversized it won't get scaled down when rendered
according to the dimensions provided by `st_shadow_get_box` in
`_st_paint_shadow_with_opacity`.
Fixes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/4409
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1897>
What the blur shader does is going n_steps in each direction (e.g. in case
we're in the horizontal pass that means left and right direction), sampling
the adjacent texels of the texel we're currently blurring. That means
n_steps actually is the amount of texels we're sampling in one direction,
not in both directions.
Make n_steps match what the blur shader does, and rename it to sampling_radius
to match what it really means. Do that for both st-theme-node-drawing.c and
st-private.c
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1542>
The framebuffer we use for rendering shadows is scaled by the resource
scale, that means we also need to offset coordinates when translating
them to the framebuffers coordinate system.
So far we forgot to do that when translating the framebuffer using the
position of the actor, which lead to small rendering bugs of
text-shadows for actors allocated at non-zero origins. To fix that,
simply multiply those positions with the actors resource scale.
https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1390
This is documented as a value between 1 and 65536. However we were passing
a 0 value for 100% transparent colors, which is interpreted as "system
inherited" in pango_renderer_get_alpha() docs.
Ensure we respect this range by specifying the minimum allowed alpha (1)
if the color is fully transparent. If someone notices this 1/65535th change
I'll ask him how many pleiades can he count.
Closes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/2504
(yes, again).
Rely on the Pango renderer handling this properly, instead of tinting
the full ClutterText in the color specified through css.
Also set the caret color explicitly, since it used to be set as a side
effect of clutter_text_set_color(), but no longer is.
Closes: https://gitlab.gnome.org/GNOME/gnome-shell/issues/850
Mutter and Clutter was changed to pass around the current target
framebuffer via the paint context instead of via the deprecated Cogl
framebuffer stack.
The framebuffer stack has also been removed from Cogl so change to use
the one in the paint context instead.
https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/827
While still leaving them unused, pass around ClutterPaintContext and
ClutterPickContext when painting and picking.
The reason for splitting this change up in two is to make it possible to
bisect easier in between the API change and the change to using the
framebuffer passed around with the temporary contexts.
https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/827
Create the surfaces for background shadows at scaled sizes and then draw on them
using logical coordinates, by setting the surface device scale accordingly.
Use the said surface scale when generating the actual shadow cairo pattern
but in such case, to reduce the number of code changes, is better to work in
absolute coordinates, and to do so:
1) Create a temporary shadow-spec copy with scaled values to absolute sizes
2) Invert the scaling on the shadow matrix
3) Do the actual painting in absolute coordinates
4) Set the shadow matrix scaling back to the logical coordinates.
Finally scale down the created shadow pattern surface size when painting it,
applying again a reverse scale to the matrix.
https://bugzilla.gnome.org/show_bug.cgi?id=765011https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/5
A fractional resource scale would mean we never use the fast path for
creating the shadow, because we'd cast the int to a float before
comparing, which would never match.
Instead compare the expected texture size with the source texture, to
actually potentially trigger the fast path.
https://bugzilla.gnome.org/show_bug.cgi?id=765011
_st_create_shadow_pipeline_from_actor creates shadow pipelines
from actors. This function special-cases ClutterTexture as a
small performance improvement, since we can have access to the
CoglTexture easily with it. However, recent commits removed all
usage of ClutterTexture from GNOME Shell, rendering this optimization
useless. Instead, actors now may have a ClutterImage set as
their content, that can be used instead.
Replace the check for ClutterTexture with a check for ClutterImage,
and use the texture of the image when it is available.
https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/371
Same case of the previous patch; _st_paint_shadow_with_opacity()
uses cogl_get_draw_framebuffer(), and this patch makes it receive
a CoglFramebuffer as a parameter instead.
The cautious reader might notice that this commit apparently goes
against the long-term goal, for it introduces more instances of
cogl_get_draw_framebuffer(). This is not wrong, but these introduced
ones will be removed later on, when ClutterActor.paint() receives
a CoglFramebuffer as a parameter instead.
https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/283
cogl_texture_new() is used in a few places in GNOME Shell, but
it's a deprecated Cogl function. The replacement is the less
verbose cogl_texture_2d_new_with_size(), that is very much a
straightforward replacement.
Remove the few places where this function is used, replacing
it by the CoglTexture2d counterpart.
https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/287
If an actor is pending a relayout when get_allocation_box() is called,
the method forces an allocation update. In case of StWidget, this might
then result in a style update and a consecutive invalidation of the
shadow spec.
A helper method that invalidates one of its parameters as a side effect
(and by extension its return value as well) is most unexpected, so cur-
rently _st_create_shadow_pipeline_from_actor() poses an easy trap to
callers to run into.
Remove that trap by calling get_size()/get_position() instead, which
don't have the unintended side effect - it is still a good idea to fix
callers who were running into this to not waste resources on creating
shadows that are invalidated before the next paint, but throwing un-
defined behavior at them is harsh ...
https://bugzilla.gnome.org/show_bug.cgi?id=788908
When creating a shadow for a ClutterTexture, we currently use the
underlying CoglTexture directly instead of rendering the actor to
an offscreen buffer. This assumes that the CoglTexture is directly
suitable as shadow source, which isn't necessarily the case - it
may have a very different size than what is shown and scaled up or
down by the hardware. In that case we end up with a scaled shadow
texture as well, which messes up the desired blur effect - the
result will be too light when scaling up, or too sharp when scaling
down. To fix this, only take the shortcut when a ClutterTexture's
underlying texture has the correct size and fall back to offscreen
rendering otherwise.
https://bugzilla.gnome.org/show_bug.cgi?id=788039
Even though the API documentation doesn't say so, the underlying
Cogl texture of a ClutterTexture may be unset, so check for that
case to avoid a runtime warning.
https://bugzilla.gnome.org/show_bug.cgi?id=784353
While CoglError is a define to GError, it doesn't follow the convention
of ignoring errors when NULL is passed, but rather treats the error as
fatal :-(
That's clearly unwanted for a compositor, so make sure to always pass
an error parameter where a runtime error is possible
https://bugzilla.gnome.org/show_bug.cgi?id=765061
If cogl_framebuffer_allocate fails in _st_create_shadow_pipeline_from_actor, the
CoglOffscreen* that was allocated earlier in the function is leaked.
https://bugzilla.gnome.org/show_bug.cgi?id=735705
Signed-off-by: Aaron Plattner <aplattner@nvidia.com>
There are quite a few crashes in retrace.fedoraproject.org that are a result of
of cairo_pattern_get_surface() failing, then a subsequent call to
cairo_image_surface_get_width() crashing because no surface was returned to the
out parameter. Knowing what causes these is hard - my best guess is widgets getting
allocated at ridiculous sizes - but avoiding the crash makes sense in any case.
See https://bugzilla.redhat.com/show_bug.cgi?id=1206754https://bugzilla.gnome.org/show_bug.cgi?id=756983
Commit 1c1f63a7d7 changed the shadow
pipeline to use cogl_framebuffer_ortographic() instead of cogl_ortho(),
but the two functions take their arguments in a different order.
Fixes graphical corruption for text shadows in the login screen.
https://bugzilla.gnome.org/show_bug.cgi?id=745061
Use ClutterActor.allocate_align_fill() so we don't have to do
this math ourselves. At the same time, clean up the RTL handling
so that it's easier to follow.
https://bugzilla.gnome.org/show_bug.cgi?id=702539
The shadows are currently rendered by painting the actor we want to
apply shadow on, in an offscreen buffer. The problem is that when this
actor has an allocation padding (ie allocation that isn't at 0x0
relatively to its parent), this padding is added within the offscreen
buffer and as a result the shadow rendering is truncated because the
offscreen buffer size is the size of the allocation box, not the
allocation box + padding.
This patch reposition the actor at 0x0 with rendering it by changing
the initial transformation matrix when rendering the actor offscreen.
https://bugzilla.gnome.org/show_bug.cgi?id=698301
Decorations are fairly uncommon in gnome-shell, so it's
worthwhile to avoid effort creating empty attr lists. This
can also help prevent a relayout.
https://bugzilla.gnome.org/show_bug.cgi?id=689400
Reroute setting those properties to a GIcon. API users are expected
to create GIcon directly now.
The advantage is that from a StIcon you can now create a similar one
by accessing :gicon.
https://bugzilla.gnome.org/show_bug.cgi?id=682540
