This makes clutter_actor_queue_redraw simply bail out early if the actor
isn't a descendant of a ClutterStage since the request isn't meaningful
and it avoids a crash when trying to queue a clipped redraw against the
stage to clear the actors old location.
This splits out all the clutter_paint_volume code from clutter-actor.c
into clutter-paint-volume.c. Since clutter-actor.c and
clutter-paint-volume.c both needed the functionality of
_fully_transform_vertices, this function has now been moved to
clutter-utils.c as _clutter_util_fully_transform_vertices.
There are too many examples where the default assumption that an actor
paints inside its allocation isn't true, so we now return FALSE in the
base implementation instead. This means that by default we are saying
"we don't know the paint volume of the actor", so developers need to
implement the get_paint_volume virtual to take advantage of culling and
clipped redraws with their actors.
This patch provides very conservative get_paint_volume implementations
for ClutterTexture, ClutterCairoTexture, ClutterRectangle and
ClutterText which all explicitly check the actor's object type to avoid
making any assumptions about subclasses.
We were always explicitly checking priv->needs_allocation in
_clutter_actor_queue_redraw_with_clip, but we only need to do that if
the CLUTTER_REDRAW_CLIPPED_TO_ALLOCATION flag is used.
This initializes priv->last_paint_box with a degenerate box, so a newly
allocated actor added to the scenegraph and made visible only needs to
trigger a redraw of its initial position. If we don't have a valid
last_paint_box though we would instead trigger a full stage redraw.
To make comparing the performance with culling/clipped redraws
enabled/disabled fairer we now avoid querying the paint box when they
are disabled, so that results should reflect how the cost of
transforming paint volumes into screen space etc gets offset against the
benefit of culling.
In clutter_stage_allocate at the end we were always querying the latest
allocation set and using the geometry to assert the viewport and then
kicking a full redraw. These only need to be done when the allocation
really changes, so we now read the previous allocation at the start of
the function and compare at the end. This was stopping clipped redraws
from being used in a lot of cases.
To consider that we've see a number of drivers that can struggle to get
going and may produce a bad first frame we now force the first 2 frames
to be full redraws. This became a serious issue after we started using
clipped redraws more aggressively because we assumed that after the
first frame the full framebuffer was valid and we only redraw the
content that changes. With buggy drivers though, applications would be
left with junk covering a lot of the stage until some event triggered a
full redraw.
This is a workaround for a race condition when resizing windows while
there are in-flight glXCopySubBuffer blits happening.
The problem stems from the fact that rectangles for the blits are
described relative to the bottom left of the window and because we can't
guarantee control over the X window gravity used when resizing so the
gravity is typically NorthWest not SouthWest.
This means if you grow a window vertically the server will make sure to
place the old contents of the window at the top-left/north-west of your
new larger window, but that may happen asynchronous to GLX preparing to
do a blit specified relative to the bottom-left/south-west of the window
(based on the old smaller window geometry).
When the GLX issued blit finally happens relative to the new bottom of
your window, the destination will have shifted relative to the top-left
where all the pixels you care about are so it will result in a nasty
artefact making resizing look very ugly!
We can't currently fix this completely, in-part because the window
manager tends to trample any gravity we might set. This workaround
instead simply disables blits for a while if we are notified of any
resizes happening so if the user is resizing a window via the window
manager then they may see an artefact for one frame but then we will
fallback to redrawing the full stage until the cooling off period is
over.
Instead of triggering a full stage redraw for Expose events we use the
geometry of the exposed region given in the event to queue a clipped
redraw of the stage.
Clutter has now taken responsibility for managing its viewport,
projection matrix and view transform as part of ClutterStage so
_cogl_setup_viewport is no longer used by anything, and since it's quite
an obscure API anyway it's we've taken the opportunity to remove the
function.
Since clutter_actor_queue_redraw now automatically clips redraws
according to the paint volume of the actor we have to be careful to
ensure we really force a full redraw when the stage is allocated a new
size or the stage viewport changes.
We have bent the originally documented semantics a bit so now where we
say "Queueing a new layout automatically queues a redraw as well" it
might be clearer to say "Queuing a new layout implicitly queues a redraw
as well if anything in the layout changes".
This should be close enough to the original semantics to not cause any
problems.
Without this change then we we fail to take advantage of clipped redraws
in a lot of cases because queuing a redraw with priv->needs_allocation
== TRUE will automatically be promoted to a full stage redraw since it's
not possible to determine a valid paint-volume.
Also queuing a redraw here will end up registering a redundant clipped
redraw for the current location, doing quite a lot of redundant
transforms, and then later when re-allocated during layouting another
queue redraw would happen with the correct paint-volume.
This uses actor paint volumes to perform culling during
clutter_actor_paint.
When performing a clipped redraw (because only a few localized actors
changed) then as we traverse the scenegraph painting the actors we can
now ignore actors that don't intersect the clip region. Early testing
shows this can have a big performance benefit; e.g. 100% fps improvement
for test-state with culling enabled and we hope that there are even much
more compelling examples than that in the real world,
Most Clutter applications are 2Dish interfaces and have quite a lot of
actors that get continuously painted when anything is animated. The
dynamic actors are often localized to an area of user focus though so
with culling we can completely avoid painting any of the static actors
outside the current clip region.
Obviously the cost of culling has to be offset against the cost of
painting to determine if it's a win, but our (limited) testing suggests
it should be a win for most applications.
Note: we hope we will be able to also bring another performance bump
from culling with another iteration - hopefully in the 1.6 cycle - to
avoid doing the culling in screen space and instead do it in the stage's
model space. This will hopefully let us minimize the cost of
transforming the actor volumes for culling.
This makes clutter_actor_queue_redraw transparently use an actor's paint
volume to queue a clipped redraw.
We save the actors paint box each time it is painted so that when
clutter_actor_queue_redraw is called we can determine the old and new
location of the actor so we know the full bounds of what must be redrawn
to clear its old view and show the new.
This makes _clutter_actor_transform_and_project_box a static function
and removes the prototype from clutter-private.h since it is no longer
used outside clutter-actor.c
The base implementation for the actor queue_relayout method was queuing
an implicit redraw, but there shouldn't be anything implied from the
mere process of queuing a redraw that should force us to queue a redraw.
If actors are moved as a part of relayouting later then they will queue
a redraw. Also clutter_actor_queue_relayout() still also explicitly
queues a redraw so I think this may have been doubly redundant.
If clutter_actor_allocate finds it necessary to update an actors
allocation then it now also queue a redraw of that actor. Currently we
queue redraws for actors very early on when queuing a relayout instead
of waiting to determine the final outcome of relayouting to determine if
a redraw is really required. With this in place we can move away from
preemptive queuing of redraws.
clutter_actor_queue_relayout currently queues a relayout and a redraw,
but the plan is to change it to only queue a relayout and honour the
documentation by assuming that the process of relayouting will
result queuing redraws for any actors whos allocation changes.
This doesn't make that change it just adds an internal
_clutter_actor_queue_only_relayout function which
clutter_actor_queue_relayout now uses as well as calling
clutter_actor_queue_redraw.
This adds a private ->relayout_pending boolean similar in spirit to
redraw_pending. This will allow us to queue a relayout without
implicitly queueing a redraw; instead we can depend on the actions
of a relayout to queue any necessary redraw.
When clutter_texture_new_from_actor is use we need to track when the
source actor queues a redraw or a relayout so we can also queue a redraw
or relayout for the texture actor.
There is an internal _clutter_actor_queue_redraw_with_clip API that gets
used for texture-from-pixmap to minimize what we redraw in response to
Damage events. It was previously working in terms of a ClutterActorBox
but it has now been changed so an actor can queue a redraw of volume
instead.
The plan is that clutter_actor_queue_redraw will start to transparently
use _clutter_actor_queue_redraw_with_clip when it can determine a paint
volume for the actor.
For the blur effect we use a BLUR_PADDING constant to pad out the volume
of the source actor on the x and y axis. Previously we were offsetting
the origin negatively using BLUR_PADDING and then adding BLUR_PADDING
to the width and height, but we should have been adding 2*BLUR_PADDING
instead.
This ensures that clipped redraws are disabled when using
CLUTTER_PAINT=redraws. This may seem unintuitive given that this option
is for debugging clipped redraws, but we can't draw an outline outside
the clip region and anything we draw inside the clip region is liable to
leave a trailing mess on the screen since it won't be cleared up by
later clipped redraws.
This adds a debug option to visualize the paint volumes of all actors.
When CLUTTER_PAINT=paint-volumes is exported in the environment before
running a Clutter application then all actors will have their bounding
volume drawn in green with a label corresponding to the actors type.
This is a fairly extensive second pass at exposing paint volumes for
actors.
The API has changed to allow clutter_actor_get_paint_volume to fail
since there are times - such as when an actor isn't a descendent of the
stage - when the volume can't be determined. Another example is when
something has connected to the "paint" signal of the actor and we simply
have no way of knowing what might be drawn in that handler.
The API has also be changed to return a const ClutterPaintVolume pointer
(transfer none) so we can avoid having to dynamically allocate the
volumes in the most common/performance critical code paths. Profiling was
showing the slice allocation of volumes taking about 1% of an apps time,
for some fairly basic tests. Most volumes can now simply be allocated on
the stack; for clutter_actor_get_paint_volume we return a pointer to
&priv->paint_volume and if we need a more dynamic allocation there is
now a _clutter_stage_paint_volume_stack_allocate() mechanism which lets
us allocate data which expires at the start of the next frame.
The API has been extended to make it easier to implement
get_paint_volume for containers by using
clutter_actor_get_transformed_paint_volume and
clutter_paint_volume_union. The first allows you to query the paint
volume of a child but transformed into parent actor coordinates. The
second lets you combine volumes together so you can union all the
volumes for a container's children and report that as the container's
own volume.
The representation of paint volumes has been updated to consider that
2D actors are the most common.
The effect apis, clutter-texture and clutter-group have been update
accordingly.
Previously we used the transformed allocation but that doesn't take
into account actors with depth which may be projected outside the
area covered by the transformed allocation.
The blur effect will sample pixels on the edges of the offscreen buffer,
so we want to add a padding to avoid clamping the blur.
We do this by creating a larger target texture, and updating the paint
volume of the actor during paint to take that padding into account.
We should be using the real, on-screen, transformed size of the actor to
size and position the offscreen buffer we use to paint the actor for an
effect.
An Effect implementation might override the paint volume of the actor to
which it is applied to. The get_paint_volume() virtual function should
be added to the Effect class vtable so that any effect can get the
current paint volume and update it.
The clutter_actor_get_paint_volume() function becomes context aware, and
does the right thing if called from within a ClutterEffect pre_paint()
or post_paint() implementation, by allowing all effects in the chain up
to the caller to modify the paint volume.
An actor has an implicit "paint volume", that is the volume in 3D space
occupied when painting itself.
The paint volume is defined as a cuboid with the origin placed at the
top-left corner of the actor; the size of the cuboid is given by three
vectors: width, height and depth.
ClutterActor provides API to convert the paint volume into a 2D box in
screen coordinates, to compute the on-screen area that an actor will
occupy when painted.
Actors can override the default implementation of the get_paint_volume()
virtual function to provide a different volume.
*** WARNING: THIS COMMIT CHANGES THE BUILD ***
Do not recurse into the backend directories to build private, internal
libraries.
We only recurse from clutter/ into the cogl sub-directory; from there,
we don't recurse any further. All the backend-specific code in Cogl and
Clutter is compiled conditionally depending on the macros defined by the
configure script.
We still recurse from the top-level directory into doc, clutter and
tests, because gtk-doc and tests do not deal nicely with non-recursive
layouts.
This change makes Clutter compile slightly faster, and cleans up the
build system, especially when dealing with introspection data.
Ideally, we also want to make Cogl part of the top-level build, so that
we can finally drop the sed trick to change the shared library from the
GIR before compiling it.
Currently disabled:
‣ OSX backend
‣ Fruity backend
Currently enabled but untested:
‣ EGL backend
‣ Windows backend
ClutterAnimator currently has a number of bugs related to its
referencing of its internal timeline.
1) The default timeline created in _init is not unreffed (it appears the
programmer has wrongly thought ClutterTimeline has a floating reference
based on the use of g_object_ref_sink in _set_timeline)
2) The timeline and slave_timeline vars are unreffed in finalize instead
of dispose
3) The signal handlers set up in _set_timeline are not disconnected when
the animator is disposed
http://bugzilla.clutter-project.org/show_bug.cgi?id=2347
Signed-off-by: Emmanuele Bassi <ebassi@linux.intel.com>
This reorganizes the loop for clutter_actor_contains so that it is a
for loop rather than a while loop. Although this is mostly just
nitpicking, I think this change could make the loop slightly faster if
not optimized because it doesn't perform the self == descendant check
twice and it is clearer.
The documentation for clutter_actor_contains didn't specify what
happens when self==descendant. A strict reading of it might lead you
to think that it would return FALSE because in that case the
descendant isn't an immediate child or a deeper descendant. The code
actually would return TRUE. I think this is more useful so this patch
fixes the docs rather than the code.
When removing all keys in a ClutterAnimator, the hash table with
object/property name pairs went out of sync. This change makes
the animator always clear this hash table upon key-removal; and
refreshing it if the animator's timeline is running.
Fixes bug #2335
Each time a material property changes we look to see if any of its
ancestry has become redundant and if so we prune that redundant
ancestry.
There was a problem with the logic that handles this though because we
weren't considering that a material which is a layer state authority may
still defer to ancestors to define the state of individual layers.
For example a material that derives from a parent with 5 layers can
become a STATE_LAYERS authority by simply changing it's ->n_layers count
to 4 and in that case it can still defer to its ancestors to define the
state of those 4 layers.
This patch checks first if a material is a layer state authority and if
so only tries to prune its ancestry if it also *owns* all the individual
layers it depends on. (I.e. if g_list_length
(material->layer_differences) != material->n_layers then it's not safe
to try pruning its ancestry!)
http://bugzilla-attachments.gnome.org/attachment.cgi?id=170907
There is GL_INVALID_ENUM error for GL_DEPTH_STENCIL when call
glRenderbufferStorage() with OpenGL ES backend. So enable this
only for OpenGL backend.
Signed-off-by: Robert Bragg <robert@linux.intel.com>
This is all internal, so we shouldn't need it; unfortunately, it seems
we're passing invalid data internally, so for the time being catching
inconsistencies should at least emit a warning for us to backtrace.
This adds a check in clutter_actor_real_queue_redraw after calling
_clutter_actor_get_stage_internal to check in case the actor doesn't yet
have an associated stage so we can avoid passing a NULL stage pointer to
_clutter_stage_set_pick_buffer_valid which could cause a crash.
*** This is an API change ***
The general pattern for axis-aligned arguments is:
x argument
y argument
If we consider columns an x-aligned argument, and row a y-aligned
argument, then we need to update the TableLayout functions to be:
column
row
and not:
row
column
We have an optimization to track when there are multiple picks per
frame so we can do a full render of the pick buffer to reduce the
number of pick renders for a static scene.
There was a problem though in that we were tracking this information in
the ClutterMainContext, but conceptually this doesn't really make sense
because the pick buffer is associated with a stage framebuffer and there
can be multiple stages for one context.
This patch moves the state tracking to ClutterStage.
This reverts commit d7e86e2696.
This was a half baked patch that was pushed a bit early since it broke
test-texture-pick-with-alpha + the commit message refers to a change on
the wip/paint-box branch that hasn't happened yet.
We have an optimization to track when there are multiple picks per
frames so we can do a full render of the pick buffer to reduce the
number of pick renders for a static scene.
There were two problems with how we were tracking this state though.
Firstly we were tracking this information in the ClutterMainContext, but
conceptually this doesn't really make sense because the pick buffer is
associated with a stage framebuffer and there can be multiple stages for
one context. Secondly - since the change to how redraws are queued - we
weren't marking the pick buffer as invalid when a queuing a redraw, we
were only marking the buffer invalid when signaling/finishing the
queue-redraw process, which is now deferred until just before a paint.
This meant using clutter_stage_get_actor_at_pos after a scenegraph
change could give a wrong result if it just read from an existing (but
technically invalid) pick buffer.
This patch moves the state tracking to ClutterStage, and ensures the
buffer is invalidated in _clutter_stage_queue_actor_redraw.
http://bugzilla.clutter-project.org/show_bug.cgi?id=2283
Signed-off-by: Emmanuele Bassi <ebassi@linux.intel.com>
The request mode set by the box layout was previously width-for-height
in a vertical layout and height-for-width in a horizontal layout which
seems to be wrong. For example, if width-for-height is used in a
vertical layout then the width request will come second with the
for_height parameter set. However a vertical layout doesn't pass the
for_height parameter on to its children so doing the requests in that
order doesn't help. If the layout contains a ClutterText then both the
width and height request for it will have -1 for the for_width and
for_height parameters so the text would end up allocated too small.
http://bugzilla.clutter-project.org/show_bug.cgi?id=2328
If set_cogl_texture() is called after unsetting the Texture's material
then we really want to make a copy of the template.
Also, we should assert more often if the internal state goes horribly
wrong: at least, we'll have a backtrace.
The order of the row_span and column_span arguments was different in
the declaration from that in the definition. This was causing the
gtk-doc to also have the wrong order.
If COGL_OBJECT_DEBUG is defined then cogl-object-private.h will call
COGL_NOTE in the ref and unref macros. For this to work the debug
header needs to also be included or COGL_NOTE won't necessarily be
defined.
If the FlowLayout layout manager wasn't allocated the same size it
requested then it should blow its caches and recompute the layout
with the given allocation size.
Instead of using the fixed position and size API, use the newly added
update_allocation() virtual function in ClutterConstraint to change the
allocation of a ClutterActor. This allows using constraints inside
layout managers, and also allows Constraints to react to changes in the
size of an actor without causing relayout cycles.
http://bugzilla.clutter-project.org/show_bug.cgi?id=2319
The Constraint should plug directly into the allocation mechanism, and
modify the allocation of the actor to which they are applied to. This is
similar to the mechanism used by the Effect class to modify the paint
sequence of an actor.
In line with the changes made in f5f066df9c to clean up how Clutter
deals with transformations of actors this patch updates the code in
clutter-offscreen-effect.c. We now query the projection matrix from the
stage instead of the perspective and instead of duplicating the logic to
setup the stage view transform we now use
_clutter_actor_apply_modelview_transform for the stage instead.
cogl_util_next_p2 is declared in cogl-util.h which is a private header
so it shouldn't be possible for an application to use it. It's
probably not a function we'd like to export from Cogl so it seems
better to keep it private. This patch renames it to _cogl_util_next_p2
so that it won't be exported from the shared library.
The documentation for the function is also slightly wrong because it
stated that the function returned the next power greater than
'a'. However the code would actually return 'a' if it's already a
power of two. I think the actual behaviour is more useful so this
patch changes the documentation rather than the code.
Previously CoglVertexBuffer would always set the flush options flags
to at least contain COGL_MATERIAL_FLUSH_FALLBACK_MASK. The code then
later checks whether any flags are set before deciding whether to copy
the material to implement the overrides. This means that it would
always end up copying the material even if there are no fallback
layers. This patch changes it so that it only sets
COGL_MATERIAL_FLUSH_FALLBACK_MASK if fallback_layers != 0.
If a single arbfp program is being shared between multiple CoglMaterials
then we need to make sure we update all program.local params when
switching between materials. Previously we had a dirty flag to track
when combine_constant params were changed but didn't take in to account
that different materials sharing the same program may have different
combine constants.
Previously the backend private state was used to either link to an
authority material or provide authoritative program state. The mechanism
seemed overly complex and felt very fragile. I made a recent comment
which added a lot of documentation to make it easier to understand but
still it didn't feel very elegant.
This patch takes a slightly different approach; we now have a
ref-counted ArbfpProgramState object which encapsulates a single ARBfp
program and the backend private state now just has a single member which
is a pointer to one of these arbfp_program_state objects. We no longer
need to cache pointers to our arbfp-authority and so we can get rid of
a lot of awkward code that ensured these pointers were
updated/invalidated at the right times. The program state objects are
not tightly bound to a material so it will also allow us to later
implement a cache mechanism that lets us share state outside a materials
ancestry. This may help to optimize code not following the
recommendations of deriving materials from templates, avoiding one-shot
materials and not repeatedly modifying materials because even if a
material's ancestry doesn't naturally lead us to shareable state we can
fallback to searching for shareable state using central hash tables.
This adds a way to iterate the layer indices of the given material since
cogl_material_get_layers has been deprecated. The user provides a
callback to be called once for each layer.
Because modification of layers in the callback may potentially
invalidate any number of the internal CoglMaterialLayer structures and
invalidate the material's layer cache this should be more robust than
cogl_material_get_layers() which used to return a const GList *
pointing directly to internal state.
This fixes the material backends to declare their constant vtable in the
c file with a corresponding extern declaration in the header. This
should fix complaints about duplicate symbols seen on OSX.
Instead of lazily incorporating combine constants as arbfp PARAM
constants in the source directly we now use program.local parameters
instead so we can avoid repeating codegen if a material's combine
constant is updated. This should be a big win for applications animating
a constant used for example in an animated interpolation, such as
gnome-shell.
http://bugzilla.clutter-project.org/show_bug.cgi?id=2280
This makes it so we don't consider LAYER_STATE_TEXTURE changes to affect
the arbfp code. This should avoid a lot of unneeded passes of
code generation for applications modifying the texture for a layer.
This makes it so we only notify backends of either a single material
change or a single layer change. Previously all material STATE_LAYERS
changes would be followed by a more detailed layer change.
For backends that perform code generation for fragment processing they
typically need to understand the details of how layers get changed to
determine if they need to repeat codegen. It doesn't help them to report
a material STATE_LAYERS change for all layer changes since it's so
broad, they really need to wait for the layer change to be notified.
What does help though is to report a STATE_LAYERS change for a change in
material->n_layers because they typically do need to repeat codegen in
that case.
This fixes a number of issues relating to how we track the arbfp private
state associated with CoglMaterials. At the same time it adds much more
extensive code documentation to try and make it a bit more approachable.
When notifying a backend about a layer being modified we now pass the
layers current owner for reference. NB: Although a layer can indirectly
be referenced by multiple layers, a layer is considered immutable once
it has dependants, so there is only ever one material associated with a
layer being modified. Passing the material pointer to the backends
layer_pre_change callback can be useful for backends that associate
their private state with materials and may need to update that state in
response to layer changes.
This renames the get_arbfp_authority function to
get_arbfp_authority_no_check to clarify that the function doesn't
validate that the authority cache is still valid by looking at the age
of the referenced material. The function should only be used when we
*know* the cache has already been checked.
We now pass a boolean to _cogl_material_pre_change_notify to know when
a material change is as a result of a layer change. We plan to use this
information to avoid notifying the backends about material changes if
they are as a result of layer changes. This will simplify the handling
of state changes in the backends because they can assume that layer and
material changes are mutually exclusive.
This adds an internal _cogl_material_get_layer_combine_constant function
so we can query the current layer combine constant back. We should
probably make this a public property getter, but for now we just need
this so we can read the constant in the arbfp backend.
We are going to start tracking more per-texture unit state with arbfp
private state so this adds an internal UnitState type and we allocate an
array of these when setting up a new private state structure. The first
thing that has been moved into this is the sampled boolean to know when
a particular texture unit gets sampled from in the generated arbfp code.
This avoids the use of of gcc constructor and destructor attributes to
initialize the cogl uprof context and optionally print a cogl uprof
report at app exit. We now initialize the uprof context in
cogl_context_create instead.
When building with --enable-profile we now depend on the uprof-0.3
developer release which brings a few improvements:
» It lets us "fix" how we initialize uprof so that instead of using a shared
object constructor/destructor (which was a hack used when first adding
uprof support to Clutter) we can now initialize as part of clutter's
normal initialization code. As a side note though, I found that the way
Clutter initializes has some quite serious problems whenever it
involves GOptionGroups. It is not able to guarantee the initialization
of dependencies like uprof and Cogl. For this reason we still use the
contructor/destructor approach to initialize uprof in Cogl.
» uprof-0.3 provides a better API for adding custom columns when reporting
timer and counter statistics which lets us remove quite a lot of manual
report generation code in clutter-profile.c.
» uprof-0.3 provides a shared context for tracking mainloop timer
statistics. This means any mainloop based library following the same
"Mainloop" timer naming convention can use the shared context and no
matter who ends up owning the final mainloop the statistics will always
be in the same place. This allows profiling of Clutter with an
external mainloop such as with the Mutter compositor.
» uprof-0.3 can export statistics over dbus and comes with an ncurses
based ui to vizualize timer and counter stats live.
The latest version of uprof can be cloned from:
git://github.com/rib/UProf.git
When try_creating_fbo fails it deletes any intermediate render buffers
that were created. However it doesn't clear the list so I think if it
failed a second time it would try to delete the render buffers
again. This could potentially cause problems if a subsequent fbo is
created because the destructor for the original might delete the
renderbuffers of the new fbo.
Since a ClutterClone may be allocated a different size than its source
actor we need to apply a scale factor before painting the source actor.
We were manually using cogl_scale to do this in clutter_clone_paint but
really this kind of thing is best handled in an implementation of the
apply_transform virtual so Clutter can be aware of the transform for
other purposes, such as input transformations. Also we want to provide
an implementation of the get_paint_volume virtual where Clutter will
also expect to be able to use the apply_transform virtual to transform
the volume into its parent's coordinate space.
If a NULL clip is passed to clutter_stage_glx_add_redraw_clip then we
update the redraw clip to have width of 0, but we weren't setting
stage_glx->initialized_redraw_clip = TRUE. This could result in a full,
unclipped stage redraw being reduced to a clipped redraw.
This adds a verbose warning that will be displayed if
clutter_actor_allocate is passed an actor that isn't a descendent of a
ClutterStage. Layouting should always bubble up from a stage so this
condition is likely to indicate a buggy container that allocating a
child that it has already unparented.
