If the driver isn't compatible to the server, all bets are off anyway wrt
the contents of the fields that we're validating, which can lead to bogus
error messages.
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.
Initialize system and FB copy in exaFillRegionSolid and adapt
exaGetPixmapFirstPixel to the new migration infrastructure.
This should mostly eliminate migration overhead for these, whether they are
used for acceleration or fallbacks.
As we can't actually accelerate anything interesting here, just migrate out
once and call fbSolidBoxClipped instead of taking a round trip via offscreen
memory with exaSolidBoxClipped.
Reuse pending damage region for extents and to prevent any actual migration of
pixmap contents when we're overwriting the whole pending damage region.
Remove superfluous manual damage tracking.
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.
The fb pointer would be left uninitialized when exaPixmapIsOffscreen
returned false. When it returned true and the pixmap was damaged,
fb would be initialized from the pixmap's devPrivate.ptr before the
exaDoMigration and exaPrepareAccess calls, at which point
devPrivate.ptr would still be pointing at offscreen memory.
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.
If the pixel in framebuffer memory isn't modified since we uploaded it, we
can just read from the system memory copy, wihch avoids both a readback and
an accelerator stall.
In principle this function is still wrong, and all the framebuffer pixel
access should be going through (w)fb so we can get pixel layout corrections.
This is mainly to avoid wasting effort for XSync(), but just reading a single
pixel directly is probably faster than DownloadFromScreen anyway. Though in
light of the latter, even larger thresholds might be useful.
Also move the swappedOut check before the migration checks because migration
can't actually occur when swapped out.
Only migrate when appropriate. In particular, don't migrate to offscreen in the
no-fallback case as copying from system memory should usually be as fast if not
faster than DownloadFromScreen, in particular if the bits need to be uploaded
to offscreen first.
