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Update release notes for 1.4.8

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Carl Worth 2007-06-07 15:03:43 -07:00
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NEWS
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Release 1.4.x
Release 1.4.8 (2007-06-07 Carl Worth <cworth@cworth.org>)
=========================================================
«Preamble»
This is the fourth update in cairo's stable 1.4 series. It comes just
over five weeks after the 1.4.6 release. This release includes a
thread-safe surface-cache for solid patterns which significantly
improves text rendering with the xlib backend. Also, dozens of error
paths in cairo have been fixed thanks to extensive fault-injection
testing by Chris Wilson.
Surface cache for solid patterns
--------------------------------
Originally written by Jorn Baayen, the introduction of a small cache
for surfaces created for solid patterns dramatically reduced the amount
the number of required surface allocations and backend traffic. For
example, this reduces the volume of X requests during text rendering
to the same level as Xft. Unfortunately, the cache had to be removed
when complications arose with threaded applications, like Evince,
which were designed to only make lockless X requests from a single
thread, but Cairo violated this design when it ejected cached surfaces,
with corresponding X traffic, from auxiliary threads. A solution was
proposed by Behdad Esfahbod, and implemented by Chris Wilson, to
introduce work queues for the xlib backend that deferred the
destruction of the X resources until the next time the application
directly operated on a xlib surface.
for surfaces created for solid patterns improves performance
dramatically. For example, this reduces the volume of X requests
during text rendering to the same level as Xft.
Improved error handling patchs
This cache first made its appearance in a 1.3.x snapshot, but was
removed before appearing in any previous major release due to
complications with multi-threaded programs. For example, programs like
evince that would carefully restrict usage of cairo-xlib to a single
thread were unpleasantly surprised to find that using cairo-image in a
separate thread could trigger X requests.
Behdad Esfahbod designed a fix which was implemented by Chris
Wilson. Now, the necessary X requests are queued up until the next
time the application directly operates on an xlib surface.
Improved error handling paths
------------------------------
Cairo has a fairly unique error-handling scheme that retains error
status with objects infected. This requires lots of internal paths
dealing with error returns and directing the error to the right
object and releasing resources correctly (like all good libraries do).
Chris Wilson previsouly stressed the memory allocation paths by
injecting memory allocations faults into cairo's performance test suite
and fixed all found issues. In this release he has done the same, plus
applying other static and dynamic stress tests on the main cairo test
suite and fixed a whole lot of other error-handling errors. We were
pleased to find that his work fixed a highly-dupped crasher in
gnome-about: http://bugzilla.gnome.org/show_bug.cgi?id=431990
Chris Wilson continued the excellent work he started in cairo 1.4.4 to
make cairo much more robust against out-of-memory and other errors. He
applied his memory allocation fault injection cairo's main test suite,
(previously he had applied it to cairo's performance suite).
Chris's testing found dozens of bugs which he fixed. Many of these
bugs had perhaps never been hit by any users. But at least one was
hit by the gnome-about program which resulted in dozens of duplicated
bug reports against that program:
http://bugzilla.gnome.org/show_bug.cgi?id=431990
We were very pleasantly surprised to see this bug get fixed as a
side-effect of Chris's work. Well done, Chris!
Other fixes
-----------
Cleanup of mutex declarations (Behdad Esfahbod)
Remove unnecessary clip region from SVG output (Emmanuel Pacaud)
Remove Xsun from the buggy_repeat blacklist (Elaine Xiong)
ATSUI: Fix glyph measurement: faster and more correct (Brian Ewins)
Release 1.4.6 (2007-05-01 Carl Worth <cworth@cworth.org>)
=========================================================
@ -3720,3 +3739,5 @@ server.
Carl Worth <cworth@isi.edu> wrote the first lines of Xr, after Keith
Packard <keithp@keithp.com> proposed the plan for a stateful drawing
library in C providing a PostScript-like rendering model.
LocalWords: mutex BeOS extraordinaire