Recording damage from other operations (e.g. creating a client damage record)
may confuse the migration code resulting in corruption.
Option "EXAOptimizeMigration" appears safe now, so enable it by default. Also
remove it from the manpage, as it should only be necessary on request in the
course of bug report diagnostics anymore.
Add a function to composite multiple independent rectangles
from the same source to the same destination in a single
operation: this is useful for building a glyph mask.
Add back exaGlyphs(); the new version copies the glyph images
onto a single large glyph pixmap and draws from their to the
destination surface. This reduces the management of small
offscreen areas and will allow us to avoid texture unit setup
between each glyph.
Replace the current score keeping algorithm with a rolling counter that's
incremented in ExaOffscreenMarkUsed, with the previous value being stored
in the area. exaOffscreenAlloc uses the difference between the counter
value and the value in the area when deciding which area to evict.
It now also takes the size of the areas into account, and favors evicting
smaller areas.
The credit for these ideas goes to Michel Dänzer.
This was an attempt to avoid scratch gc creation and validation for paintwin
because that was expensive. This is not the case in current servers, and the
danger of failure to implement it correctly (as seen in all previous
implementations) is high enough to justify removing it. No performance
difference detected with x11perf -create -move -resize -circulate on Xvfb.
Leave the screen hooks for PaintWindow* in for now to avoid ABI change.
Improve exaShmPutImage performance and reuse its core in exaPutImage as it
seems faster than the previous code when the driver doesn't provide an
UploadToScreen hook.
Make sure all damage records are notified of the damage incurred by actual
ShmPutImage calls.
Remove superfluous manual damage tracking for actual PutImage calls.
Exclude bits that will be overwritten from migration.
Use exaGlyphs even when Composite can't be accelerated, to avoid PolyFillRect
roundtrip via offscreen memory.
Initialize mask pixmap in exaGlyphs in FB in addition to system if the driver
provides Composite hooks to avoid migration overhead.
Remove manual damage tracking where superfluous.
Only migrate once in exaTrapezoids/Triangles instead of every time in
exaRasterizeTrapezoid/AddTriangles. Adapt manual damage tracking to new
infrastructure.
Also move definition of NeedsComponent() closer to where it's used.
We finally want to catch all cases where the pixmap pointer is dereferenced
outside of exaPrepare/FinishAccess.
Also fix a couple of such cases exposed by this change.
The initiator of migration can pass in a region that defines the relevant area
of each source pixmap or the irrelevant area of the destination pixmap. By
default, the pending damage region is assumed relevant for the destination
pixmap, and everything for source pixmaps.
Thanks to Jarno Manninen for reassuring me that my own ideas for this were
feasible and for providing additional ideas.
over to new system.
Need to update documentation and address some remaining vestiges of
old system such as CursorRec structure, fb "offman" structure, and
FontRec privates.
Composite's automatic redirection is a more general mechanism than the
ad-hoc BS machinery, so it's much prettier to implement the one in terms
of the other. Composite now wraps ChangeWindowAttributes and activates
automatic redirection for windows with backing store requested. The old
backing store infrastructure is completely gutted: ABI-visible structures
retain the function pointers, but they never get called, and all the
open-coded conditionals throughout the DIX layer to implement BS are gone.
Note that this is still not a strictly complete implementation of backing
store, since Composite will throw the bits away on unmap and therefore
WhenMapped and Always hints are equivalent.
miTrapezoids creates an alpha pixmap and initializes the contents
using PolyFillRect, which causes the pixmap to be moved in for
acceleration. The subsequent call to RasterizeTrapezoid won't be
accelerated by EXA, which causing the pixmap to be moved back out
again.
By wrapping Trapezoids and using ExaCheckPolyFillRect instead of
PolyFillRect to initialize the pixmap, we avoid this roundtrip.
Instead of system-memory data which prevents accelerated
compositing of glyphs, (at least without forcing an upload
of the glyph data before compositing).
* Support planemasks, different ALUs and arbitrary tile origin.
* Leave damage tracking and non-trivial fallbacks to callers.
* Always migrate for fallbacks.
This is in preparation for using these from more other functions.
This is a new behavior for version 2.1 of EXA, and only takes effect if the
driver has requested that. Otherwise, the previous behavior remains the same.
Mostly due to exaDrawableDirty() now calculating the backing pixmap coordinates
internally, for cases where they aren't trivially known. There's a new
exaPixmapDirty() function for the other cases.
one behaves somewhat between Greedy and Always. It moves in if we can
accelerate, unless the destination is clean and shouldn't be kept in
framebuffer according to the score, in which case we migrate out (and
force-migrate anything where migration is free). This should help fix
lack of acceleration for drivers without UTS since removing
exaAsyncPixmapGCOps, and has removed one performance trap with Radeon
I'd noticed. It is the new default.
implementation to avoid unprepared access to the tile. Also, relocate
the fbGetDrawable to avoid using a stale dest pointer after
exaSolidBoxClipped() may have migrated it. Revealed by xtest.
devPrivate.ptr when pointing at offscreen memory, outside of
exaPrepare/FinishAccess(). This was used with fakexa to find (by NULL
dereference) many instances of un-Prepared CPU access to the
framebuffer:
- GC tiles used in several ops when fillStyle == FillTiled were never
Prepared.
- Migration could lead to un-Prepared access to mask data in render's
Trapezoids and Triangles
- PutImage's UploadToScreen failure fallback failed to Prepare.
plug in the accelerated one, even if the destination pixmap is
currently offscreen. This was a leftover from when kaa originally got
accelerated offscreen pixmap support, and its only concievable use was
to avoid a little overhead on ops to in-system pixmaps that weren't
going to get migrated. At this point, we probably care more about just
getting everything accelerated that we easily can, which should happen
with the new migration support.
