to address issues with NetBSD-6(and earlier)'s fontconfig not being
new enough for pango.
While doing that, also bump freetype2 dependency to current pkgsrc
version.
Suggested by tron in PR 47882
Release 1.12.14 (2013-02-10 Chris Wilson <chris@chris-wilson.co.uk>)
====================================================================
In the last week we had a few more bugs reported and promptly resolved.
As these are a combination of regressions and stability issues, it is
time for a prompt update and release. Many thanks to everyone for
testing and reporting issues, and helping to make Cairo better.
Bug fixes
---------
Prevent user callbacks accessing user-data during destroy to prevent
use-after-free bugs.
https://bugzilla.mozilla.org/show_bug.cgi?id=722975
Use standard names for glyphs in subset fonts (PDF).
https://bugs.freedesktop.org/show_bug.cgi?id=60248
Fix detection of Win98. The logic for detecting Win98 (and its broken
AlphaBlend()) was inverted, disabling AlphaBlend() for everyone.
Prevent numeric overflow from extrapolating polygon edges to the clip
boundary and causing severe render artifacts.
https://bugs.freedesktop.org/show_bug.cgi?id=60489
Fix computation of glyph string coordinates when breaking up runs
for xlib.
Fix an assertion in the win32 backend for failing to clear its
similar-images.
https://bugs.freedesktop.org/show_bug.cgi?id=60519
Release 1.12.12 (2013-01-31 Chris Wilson <chris@chris-wilson.co.uk>)
===================================================================
The goal of this release is to fix the synchronisation problems that
were exhibited in the SHM transport for cairo-xlib. This cropped up
any place that tried to rapidly push fresh pixel data to the X server
through an ordinary image surface, such as gimp-2.9 and evince.
Bug fixes
---------
Avoid replacing the entire image when uploading subimages
https://bugs.freedesktop.org/show_bug.cgi?id=59635
Force synchronisation for scratch SHM image buffers, so that we do
not overwrite data as it is being read by X.
https://bugs.freedesktop.org/show_bug.cgi?id=59635 (also)
Fix typos in detecting multisampling for the GL (MSAA) backend.
Fix a memory leak in the GL (MSAA) backend.
Fix a reference counting bug when mapping a GL surface to an image.
Release 1.12.10 (2013-01-16 Chris Wilson <chris@chris-wilson.co.uk>)
===================================================================
A heap of bug fixes everywhere, and the gradual completion of the MSAA
backend for cairo-gl. Perhaps the most noteworthy set of the bugfixes
was the crusage lead by Behdad Eshfabod to make font handling by
pango/cairo/fontconfig fully threadsafe. This testing revealed a couple
of races that needed fixing in Cairo's scaled-font and glyph cache.
Bug fixes
---------
Append coincident elements to the recording's surface bbtree so that
the list is not corrupted and the overlapping elements lost.
Fix cairo-trace to correctly record map-to-image/unmap-image and then
replay them.
Ignore MappingNotifies when running the XCB testsuite as they are sent
to all clients when the keyboard changes. The testsuite would detect
the unexpected event and complain.
Handle very large large images in the XCB backend.
Fix a memory leak in the xlib/shm layer, and prevent use of the SHM
surfaces after the display is closed.
https://bugs.freedesktop.org/show_bug.cgi
Handle resizing of bitmap fonts, in preparation for a fix to
fontconfig to correctly pass on the user request for scaling.
Always include subroutine 4 (hint replacement idion) when subsetting
type 1 fonts in order to prevent a crash in cgpdftops on Mac OS/X
Fix a couple of typos in the cairo-gobject.h header files for
introspection.
Prevent a mutex deadlock when freeing a scaled-glyph containing a
recording-surface that itself references another scaled-glyph.
https://bugs.freedesktop.org/show_bug.cgi?id=54950
Make scaled-font cache actually thread-safe and prevent
use-after-frees.
Restore support for older versions of XRender. A couple of typos and a
few forgotten chunks prevented the xlib compositor from running
correctly with XRender < 0.10. Note that there are still a few
regressions remaining.
Release 1.12.8 (2012-11-24 Chris Wilson <chris@chris-wilson.co.uk>)
===================================================================
Another couple of weeks and a few more bugs have been found and fixed,
it is time to push the next point release. Many thanks to everyone who
reported their issues and helped us track down the bugs and helped
testing the fixes.
Bug fixes
---------
Expand the sanity checking for broken combinations of XSendEvent and
ShmCompletionEvent.
Notice that "The X.Org Foundation" sometimes also identifies itself
as "The Xorg Foundation".
Handle various ages of libXext and its Shm headers.
Fix the invalid clipping of the source drawable when using SHM
transport to upload images.
https://bugs.freedesktop.org/show_bug.cgi?id=56547
Handle all Type1 postscript operators for better font compatibility.
https://bugs.freedesktop.org/show_bug.cgi?id=56265
Fix a couple of memory leaks in Type1 font subsetting
https://bugs.freedesktop.org/show_bug.cgi?id=56566
Tighten the evaluation of the start/stop pen vertices, and catch a few
instances where we would use a fan instead of a bevel.
https://bugs.freedesktop.org/show_bug.cgi?id=56432
Fix assumption that geometric clipping always succeeds with the
span-compositor.
https://bugs.freedesktop.org/show_bug.cgi?id=56574
Fix call to spline intersection when evaluating whether a stoke is
visible.
Remember to copy inferior sources when using SHM to readback the
surface for use as a source.
build on NetBSD-5 with native Xorg.
Additionally, disable GL support since NetBSD-5's MesaLib is too old and,
according to upstream, cairo-gl "is only really being experimented
with currently by toy applications".
Bump PKGREVISION.
Tested by Andreas Gustafsson and David Brownlee.
that libXext/bl3.mk doesn't include xextproto/bl3.mk.
Since the supposed gains for this are minimal and the annoyances are high,
do include xextproto/bl3.mk in libXext/bl3.mk.
Release 1.12.6 (2012-10-22 Chris Wilson <chris@chris-wilson.co.uk>)
===================================================================
Thanks to everyone who download cairo-1.12.4 and gave us their feedback.
It truly was invaluable and has helped us to fix many portability issues
that crept in with some of the new features. This release aims to fix
those stability issues and run on a wider range of systems.
Bug fixes
---------
Fix the recording surface to actually snapshot the source and so fix
PDF drawing.
Calling XSendEvent with an XShmCompletionEvent is incompatabile with
older Xorg servers.
Reorder CloseDisplay chain so that XShm is not reinstantiated after
shutdown, causing a potential crash if the Display was immediately
recreated using the same memory address.
Make sure that the Xserver has attached to the SHM segment before
deleting it from the global namespace on systems that do not support
deferred deletion.
Type1 subsetting support for PDF (and PS) was once again improved to
work with a larger number of PDF readers.
GLESv2 build fixes and improved support for embedded GPUs.
Tweak the invisible pen detection for applications that are currently
using too large values for geometric tolerance.
A build fix for older freetype libraries.
Configuration script correctly detects that libdl is not needed
for dlsym(3) but ignores the result for not yet identified reason.
Noticed on FreeBSD 9.0.
1.12.4 causes SHM problems on OS X and NetBSD.
E.g. for firefox, during startup, on 6.99.12/amd64:
###!!! ABORT: X_ShmAttach: BadAccess (attempt to access private resource denied); 11 requests ago: file /scratch/devel/xulrunner/work/mozilla-release/toolkit/xre/nsX11ErrorHandler.cpp, line 157
###!!! ABORT: X_ShmAttach: BadAccess (attempt to access private resource denied); 11 requests ago: file /scratch/devel/xulrunner/work/mozilla-release/toolkit/xre/nsX11ErrorHandler.cpp, line 157
zsh: segmentation fault (core dumped) firefox
Or for xchat on OS X Lion:
The program 'xchat' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadAccess (attempt to access private resource denied)'.
(Details: serial 5738 error_code 10 request_code 133 minor_code 1)
(Note to programmers: normally, X errors are reported asynchronously;
that is, you will receive the error a while after causing it.
To debug your program, run it with the --sync command line
option to change this behavior. You can then get a meaningful
backtrace from your debugger if you break on the gdk_x_error() function.)
Release 1.12.4 (2012-10-05 Chris Wilson <chris@chris-wilson.co.uk>)
===================================================================
More bugs, and more importantly, more fixes. On the cairo-gl side, we
have refinements to the MSAA compositor which enables hardware
acceleration of comparitively low-quality antialiasing - which is useful
in animations and on very high density screens. For cairo-xlib, we have
finally enabled SHM transport for image transfers to and from the X
server. A long standing required feature, SHM transport offers a notable
reduction in rendering latency by reducing the number of copies
required to upload image data - given hardware and driver support,
cairo-xlib can now perform zero copy uploads onto the GPU. And as usual
Adrian Johnson has been very busy fixing many different corner cases in
cairo-pdf, impoving opacity groups and font subsetting. Last, but not
least, for cairo-image Søren Sandmann Pedersen added support for
rendering glyphs to pixman and using that from within cairo. The new
glyph rendering facility reduces the overhead for setting up the
compositing operation, improving glyph thoughput for the image backend
by a factor of about 4. And before he did so, he also fixed up a few
bugs in the existing glyph rendering code. So many thanks to Andrea
Canciani, Adrian Johnson, Chuanbo Weng, Dongyeon Kim, Henry Song, Martin
Robinson, Søren Sandmann Pedersen and Uli Schlachter for their
contributions, finding and fixing bugs.
Bug fixes
---------
Interior boxes were being dropped when amalgamating regions during
tesselation.
https://bugs.freedesktop.org/show_bug.cgi?id=49446
Allow building without gtk-doc installed
Invalid edge generation whilst reducing complex polygons.
https://bugs.freedesktop.org/show_bug.cgi?id=50852
Stroking around tight cusps
Use locale correct formats for reading font subsetting and valid
buffers.
https://bugs.freedesktop.org/show_bug.cgi?id=51443
Ensure that the type1 subset includes all the glyph encodings
https://bugs.freedesktop.org/show_bug.cgi?id=53040
Upload the whole source for a repeating pattern.
https://bugs.freedesktop.org/show_bug.cgi?id=51910
Fix damage tracking to handle continuation chunks corectly and so
prevent crashes on win32.
https://bugs.freedesktop.org/show_bug.cgi?id=53384
Avoid emitting miter joins for degenerate line segments
https://bugzilla.mozilla.org/show_bug.cgi?id=407107
Convert the relative path semgents into the backend coordinates
and then back again to user coordinates (cairo_copy_path,
cairo_append_path)
https://bugs.freedesktop.org/show_bug.cgi?id=54732
Fix extents computations for a degenerate path consisting only of a
move-to
https://bugs.freedesktop.org/show_bug.cgi?id=54549
Prevent crashing on a degenerate project edge after polygon
intersection
https://bugs.freedesktop.org/show_bug.cgi?id=54822
Set the minimum version accordingly. The package now uses "libxcb" from
"pkgsrc" under Mac OS X Snow Leopard which fixes the build.
Bump package revision because of the dependence change.
After such a long gestation period for the release of Cairo 1.12, we
inevitably accumulated a few bugs that were flushed out by broadening the
test base. Thanks to everybody who tried the release, apologies to any one
unfortunate enough to encounter a bug and many thanks for reporting it.
The problem is the following: When checking the CFLAGS / LIBS for
including pthread support, any warning on stdout is counted as a no.
However, the test does not use CFLAGS on the command line, which
produces a harmless debug warning. This workaround has the consequence
of adding the default CFLAGS twice on the command line but this is not
a problem.
Release 1.10.2 (2010-12-25 Chris Wilson <chris@chris-wilson.co.uk>)
===================================================================
The cairo community is pleased to announce the 1.10.2 release of the
cairo graphics library. This is the first update to cairo's stable 1.10
series and contains a large number of bug fixes.
While many people have contributed and have help to test the release,
2 people deserve special recognition for their efforts in tracking down
and fixing bugs, Andrea Canciani and Adrian Johnson. Thanks to their
tremendous efforts, and of all cairo contributors, it is much
appreciated.
We recommend everyone upgrade to cairo 1.10.2 and hope that everyone
will continue to have lots of fun with cairo!
-Chris
Bug fixes
---------
Fix embedding of grayscale jpegs in PS.
https://bugs.freedesktop.org/show_bug.cgi?id=31632
Fix the reported path of extents containing a curve.
Fix the compositing of unaligned boxes.
Reset the clipper in PDF upon finish.
Fix degenerates arcs to become a degenerate line.
Build support for autoconf 2.67
Fix painting of transformed patterns in PS
Fix the EPS bounding box for PS
https://bugs.freedesktop.org/show_bug.cgi?id=24688
Fix the missing content for EPS
https://bugs.freedesktop.org/show_bug.cgi?id=24688
Fix regression upon changing page size in PS/PDF
https://bugs.freedesktop.org/show_bug.cgi?id=24691
Only use ActualText with PDF-1.5 documents
Fix the bbox for type1 fallbacks.
Reset the color after ending the context in PDF
https://bugs.freedesktop.org/show_bug.cgi?id=31140
Fix the advance of subsetted type1 fonts
https://bugs.freedesktop.org/show_bug.cgi?id=31062
Fix handling of EXTEND_NONE gradients for PDF
Restrict in-place optimisation for a8 image masks with SOURCE
Release 1.10.0 (2010-09-06 Chris Wilson <chris@chris-wilson.co.uk>)
===================================================================
The cairo community is astounded (and flabbergast) to finally announce
the 1.10.0 release of the cairo graphics library. This is a major update
to cairo, with new features and enhanced functionality which maintains
compatibility for applications written using any previous major cairo
release, (1.8, 1.6, 1.4, 1.2, or 1.0). We recommend that anybody using
a previous version of cairo upgrade to cairo 1.10.0.
One of the more interesting departures for cairo for this release is the
inclusion of a tracing utility, cairo-trace. cairo-trace generates a
human-readable, replayable, compact representation of the sequences of
drawing commands made by an application. This can be used to inspecting
applications to understand issues and as a means for profiling
real-world usage of cairo.
The traces generated by cairo-trace have been collected in
git://git.cairographics.org/git/cairo-traces
and have driven the performance tuning of cairo over the last couple of
years. In particular, the image backend is much faster with a new
polygon rasterisation and a complete overhaul of the tessellator. Not
only is this faster, but also eliminates visual artifacts from
self-intersecting strokes. Not only has cairo-trace been driving
performance improvements within cairo, but as a repeatable means of
driving complex graphics it has been used to tune OpenGL, DDX, and
pixman.
Cairo's API has been extended to better support printing, notably
through the ability to include a single compressed representation of an
image for patterns used throughout a document, leading to dramatic file
size reductions. Also the meta-surface used to record the vector
commands compromising a drawing sequence is now exposed as a
CAIRO_SURFACE_TYPE_RECORDING, along with a new surface that is a child of a
larger surface, CAIRO_SURFACE_TYPE_SUBSURFACE. One typical usage of a
subsurface would be as a source glyph in a texture atlas, or as a
restricted subwindow within a canvas.
Cairo's API has also resurrected the RGB16 format from the past as
the prevalence of 16-bit framebuffers has not diminished and is a
fore-taste of the extended format support we anticipate in the future.
Increasing cairo's utility, we introduce the cairo_region_t for handling
sets of pixel aligned rectangles commonly used in graphics applications.
This is a merger of the GdkRegion and the pixman_region_t, hopefully
providing the utility of the former with the speed of the latter.
Furthermore cairo has been reworked to interoperate more closely with
various acceleration architectures, gaining the ability to share
those hardware resources through the new cairo_device_t. For instance,
with the new OpenGL backend that supersedes the Glitz backend, hardware
and rendering operations can be shared between a classic OpenGL
application mixing libVA for the hardware assisted video decode with
cairo for high quality overlays all within the same OpenGL canvas.
Many thanks for the hard work of Adrian Johnson, Andrea Canciani, Behdad
Esfahbod, Benjamin Otte, Carl Worth, Carlos Garcia Campos, Chris Wilson,
Eric Anholt, Jeff Muizelaar, Karl Tomlinson, M Joonas Pihlaja, Søren
Sandmann Pedersen and many others that have contributed over the last
couple of years to cairo. Thank you all!
Snapshot 1.9.14 (2010-07-26)
============================
A quiet couple of weeks, hopefully Cairo is seeing widescale deployment and
we are being to see the results of the stabilisation effort. Clipping bugs
seems to have been the order of the last couple of weeks, with a couple
reported and duly fixed. Thank you Igor Nikitin and Karl Tomlinsion for
finding those regressions. At this point all that seems to remain to do is
to fix the outstanding regressions in the PDF backend...
Bugs fixes
----------
Clip doesn't work for text on the image backend
https://bugs.freedesktop.org/show_bug.cgi?id=29008
Add explicit dependency for cxx
https://bugs.freedesktop.org/show_bug.cgi?id=29114
Fix regressions in reporting clip extents
https://bugs.freedesktop.org/show_bug.cgi?id=29120https://bugs.freedesktop.org/show_bug.cgi?id=29121https://bugs.freedesktop.org/show_bug.cgi?id=29122https://bugs.freedesktop.org/show_bug.cgi?id=29124https://bugs.freedesktop.org/show_bug.cgi?id=29125
Snapshot 1.9.12 (2010-07-12)
============================
A couple of weeks spent fixing those annoying bugs and cleaning up the build
system; the list of outstanding tasks to complete for the stable release is
finally shrinking. The chief bug fixer has been Benjamin Otte who not only
made sure that the public API is consistent and being tested for its
consistency, but also ensured that the documentation was up-to-date and
spent time clarifying cases where even the Cairo developers have come
unstuck in the past. Many thanks, Benjamin. However, he was not alone,
as Andrea Canciani continued his fine work in isolating broken corner cases
and proceeding to fix them, and tidying up the quartz backend. And last, but
definitely not least, M Joonas Pihlaja tried building Cairo across a
perverse range of systems and fixed up all the loose bits of code that came
unravelled. Thanks everybody!
API Changes
-----------
cairo_surface_set_mime_data, cairo_surface_get_mime_data:
The length parameter is now an unsigned long (as opposed to an unsigned
int). The parameter is intended to be an equivalent to a size_t without
requiring POSIX types and be large enough to store the size of the
largest possible allocation.
cairo_gl_surface_create_for_texture:
This a new surface constructor for cairo-gl that explicitly enables
render-to-texture for foreign, i.e. application, textures.
cairo_region_xor, cairo_region_xor_rectangle
A couple of utility routines add to the region handling interface for
the purpose of replacing existing GdkRegion functionality.
Bugs fixes
----------
https://bugs.launchpad.net/ubuntu/+source/cairo/+bug/600622
Inkscape was caught in the act of attempting to modify a finished surface.
Unfortunately, we had the ordering of our guards and assertions wrong and
so an ordinary application error was triggering an assert in Cairo. This
lead Benjamin to add a test case to ensure that the entire public API
could handle erroneous input and then proceeded to fix a whole slew of
uncovered bugs.
https://bugs.freedesktop.org/show_bug.cgi?id=28888
A regression introduced by the special casing of uploading images to an
xlib surface in-place which was ignoring the translation applied to the
image.
Snapshot 1.9.10 (2010-06-26)
============================
The first "quick" snapshot in the run up to the stable release. The
last snapshot was picked up by the bleeding edge distributions and so the
bug reports have to started to roll in. The most frequent of these are the
introduction of rendering errors by applications that modify a surface
without subsequently calling cairo_surface_mark_dirty(). Make sure the
application developers are aware of increased reliance on strict use of the
Cairo API before 1.10 is released!
The usual slew of bugs reported and we would like to thank Zoxc for
contributing the WGL interface for cairo-gl, and finding more build
failures on win32. And it just wouldn't be a 1.9 snapshot unless
Benjamin Otte improved the error handling within cairo-gl, as well as
isolating and fixing some more errors in the test suite. The biggest bug of
the snapshot turned out to be a major sign extension issue that had lain
hidden for many years and was suddenly exposed by incorrectly rounding
rectangles when performing non-antialiased rendering. Also to the relief
of many we have included the downstream patch to honour the user's LCD
filtering preferences for subpixel rendering of fonts. The interface
remains private for the time being, whilst the proposed public API is
finalized.
API changes
-----------
None.
Snapshot 1.9.8 (2010-06-12)
===========================
One major API changes since the last snapshot, and a whole slew of bugs
fixed and inconsistencies eliminated. Far too many bugs fixed to
individually identify. We need to thank Benjamin Otte for his fantastic
work on the cairo-gl backend making it faster and more robust, Andrea
Canciani for finding so many bugs and developing test cases for them, as
well fixing them. And last but not least we must all thank Adrian Johnson for
continuing to eliminate bugs and improving the PostScript and PDF backends.
This snapshot represents almost 4 months of bug fixing, bringing Cairo to
a point where we consider it almost ready to be a candidate for release.
There are a few known bugs left to be fixed, being tracked in
https://bugs.freedesktop.org/show_bug.cgi?id=24384, so please give Cairo a
whirl and report any regressions. The plan is to release a new snapshot
every other week leading to a 1.10 release with a target date of
2010-08-16.
API additions
-------------
CAIRO_FORMAT_RGB16_565
16 bit devices still remain popular, and so with great demand,
CAIRO_FORMAT_RGB16_565 has been restored enabling applications to create
and use 16 bit images as sources and render targets.
cairo_surface_create_for_rectangle()
It is common practice to cut an image up into many smaller pieces and use
each of those as a source - a technique called texture atlasing.
cairo_surface_create_for_rectangle() extends Cairo to directly support use
of these subregions of another cairo_surface_t both as a source and as a
render target.
cairo_region_create()
cairo_region_create_rectangle()
cairo_region_create_rectangles()
cairo_region_copy()
cairo_region_reference()
cairo_region_destroy()
cairo_region_equal()
cairo_region_status()
cairo_region_get_extents()
cairo_region_num_rectangles()
cairo_region_get_rectangle()
cairo_region_is_empty()
cairo_region_contains_rectangle()
cairo_region_contains_point()
cairo_region_translate()
cairo_region_subtract()
cairo_region_subtract_rectangle()
cairo_region_intersect()
cairo_region_intersect_rectangle()
cairo_region_union()
cairo_region_union_rectangle()
The Cairo region API was actually added a couple of snapshots ago, but we
forgot to mention it at the time. A simple API for the handling of
rectangular pixel-aligned regions by Soeren Sandmann.
Backend-specific improvements
-----------------------------
cairo-gl
Benjamin Otte made more than 200 commits in which he refactored the cairo-gl
backend, reducing a lot of code duplication and enabled him to begin working
on improving performance by reducing state changes and associated overhead.
cairo-xlib
Access to the underlying connection to the Display is now thread-safe
enabling cairo-xlib to be used in a multi-threaded application without fear
of random corruption. Thanks Benjamin Otte!
cairo-xlib will now attempt to use PolyModeImprecise when compositing
trapezoids (i.e. a fill or a stroke operation with a non-trivial path) which
should allow hardware drivers more scope for accelerating the operation at
the cost of potentially incurring minute rendering errors. The mode can be
forced back to PolyModePrecise by setting the antialias parameter to
CAIRO_ANTIALIAS_SUBPIXEL.
cairo-svg
A notable improvement was contributed by Alexander Shulgin to enable SVG to
reference external image through the use an extended MIME data type.
Snapshot 1.9.6 (2010-02-19)
===========================
API additions
-------------
Add cairo_device_t
The device is a generic method for accessing the underlying interface
with the native graphics subsystem, typically the X connection or
perhaps the GL context. By exposing a cairo_device_t on a surface and
its various methods we enable finer control over interoperability with
external interactions of the device by applications. The use case in
mind is, for example, a multi-threaded gstreamer which needs to serialise
its own direct access to the device along with Cairo's across many
threads.
Secondly, the cairo_device_t is a unifying API for the mismash of
backend specific methods for controlling creation of surfaces with
explicit devices and a convenient hook for debugging and introspection.
The principal components of the API are the memory management of:
cairo_device_reference(),
cairo_device_finish() and
cairo_device_destroy();
along with a pair of routines for serialising interaction:
cairo_device_acquire() and
cairo_device_release()
and a method to flush any outstanding accesses:
cairo_device_flush().
The device for a particular surface may be retrieved using:
cairo_surface_get_device().
The device returned is owned by the surface.
API changes (to API new in the cairo 1.9.x series)
--------------------------------------------------
cairo_recording_surface_create()
cairo_recording_surface_ink_extents()
These are the replacement names for the functions previously named
cairo_meta_surface_create and cairo_meta_surface_ink_extents.
cairo_surface_set_mime_data
This interface is now changed such that the MIME data will be
detached if the surface is modified at all. This guarantees that
the MIME data will not become out of synch due to surface
modifications, and also means that for the MIME data to be useful,
it must be set after all modifications to the surface are
complete.
API removal (of experiment API)
-------------------------------
The cairo-glitz backend is removed entirely, (in favor of the new
cairo-gl backend). See below for more on cairo-gl.
Generic fixes
-------------
Many improvements for drawing of dashed strokes
Fix incorrect handling of negative offset
Faster computation of first dash (avoids near-infinite looping)
Approximate extremely fine dash patterns with appropriate alpha value
Optimize spans-based renderers for repeated rows, (such as in a rounded rectangle)
Backend-specific improvements
-----------------------------
cairo-drm
This is a new, direct-rendering backend that supports Intel graphics
chipsets in the i915 and i965 families. It's still experimental and
will likely remain that way for a while. It's already got extremely
good performance on the hardware it supports, so if nothing else
provides a working proof and performance target for the cairo-gl
work for Intel graphics.
cairo-gl
Start using GLSL to accelerate many operations. Many thanks to Eric
Anholt and T. Zachary Laine for this work. For the first time, we
have what looks like what will be a very compelling OpenGL-based
backend for cairo (in terms of both quality and performance).
See this writeup from Eric for more details on recent progress of
cairo-gl (which he presented at FOSDEM 2010):
http://anholt.livejournal.com/42146.html
cairo-image
The image backend is made dramatically faster (3-5 times faster for
benchmarks consisting primarily of glyph rendering).
cairo-quartz fixes:
Many fixes from Robert O'Callahan and Andrea Canciani including:
Fixed gradient pattern painting
Improved A8 image handling
Fixes for "unbounded" and other compositing operators
cairo-pdf fixes:
Improvements to embedding of JPEG and JPEG2000 data.
cairo-ps fixes:
Fix printing of rotated user fonts.
Snapshot 1.9.4 (2009-10-15)
===========================
API additions:
cairo_meta_surface_create()
cairo_meta_surface_ink_extents()
Finally exporting the internal meta-surface so that applications
have a method to record and replay a sequence of drawing commands.
cairo_in_clip()
Determines whether a given point is inside the current clip.
??? Should this be called cairo_in_paint() instead? in-clip is the test
that is performed, but in-paint would be similar to in-fill and in-stroke.
New utilities:
cairo-test-trace
A companion to cairo-perf-trace, this utility replays a trace against
multiple targets in parallel and looks for differences in the output,
and then records any drawing commands that cause a failure.
Future plans:
Further minimisation of the fail trace using "delta debugging".
More control over test/reference targets.
Backend improvements:
xlib
Server-side gradients. The theory is that we can offload computation
of gradients to the GPU and avoid pushing large images over the
connection. Even if the driver has to fallback and use pixman to render
a temporary source, it should be able to do so in a more efficient manner
than Cairo itself. However, cairo-perf suggests otherwise:
On tiny, Celeron/i915:
before: firefox-20090601 211.585
after: firefox-20090601 270.939
and on tiger, CoreDuo/nvidia:
before: firefox-20090601 70.143
after: firefox-20090601 87.326
In particular, looking at tiny:
xlib-rgba paint-with-alpha_linear-rgba_over-512 47.11 (47.16 0.05%) -> 123.42 (123.72 0.13%): 2.62x slowdown
█▋
xlib-rgba paint-with-alpha_linear3-rgba_over-512 47.27 (47.32 0.04%) -> 123.78 (124.04 0.13%): 2.62x slowdown
█▋
New experimental backends:
QT
OpenVG - The initial work was done by Øyvind Kolås, and made ready for
inclusion by Pierre Tardy.
OpenGL - An advanced OpenGL compositor. The aim is to write a integrate
directed rendering using OpenGL at a high-level into Cairo. In
contrast to the previous attempt using Glitz which tried to
implement the RENDER protocol on top of OpenGL, using the
high-level interface should permit greater flexibility and
more offloading onto the GPU.
The initial work on the backend was performed by Eric Anholt.
Long standing bugs fixed:
Self-intersecting strokes.
A long standing bug where the coverage from overlapping semi-opaque
strokes (including neighbouring edges) was simply summed in lieu of
a costly global calculation has been fixed (by performing the costly
global calculation!) In order to mitigate the extra cost, the
tessellator has been overhauled and tune, which handles the fallback
for when we are unable to use the new span rasteriser on the stroke
(e.g. when using the current RENDER protocol). The large number of
pixel artefacts that implementing self-intersection elimination
removes is ample justification for the potential performance
regression. If you unfortunately do suffer a substantial performance
regression in your application, please consider obtaining a
cairo-trace and submitting it to us for analysis and inclusion into
our performance suite.
Special thanks:
To the AuroraUX team for providing access to one of their OpenSolaris
machines for cairo and pixman development. http://www.auroraux.org/
Snapshot 1.9.2 (2009-06-12)
===========================
API additions:
cairo_surface_set_mime_data()
cairo_surface_get_mime_data()
Should this take unsigned int, unsigned long or size_t for the length
parameter? (Some datasets may be >4GiB in size.)
Associate an alternate, compressed, representation for a surface.
Currently:
"image/jp2" (JPEG2000) is understood by PDF >= 1.5
"image/jpeg" is understood by PDF,PS,SVG,win32-printing.
"image/png" is understood by SVG.
cairo_pdf_version_t
cairo_pdf_surface_restrict_to_version()
cairo_pdf_get_versions()
cairo_pdf_version_to_string()
Similar to restrict to version and level found in SVG and PS,
these limit the features used in the output to comply with the PDF
specification for that version.
CAIRO_STATUS_INVALID_SIZE
Indicates that the request surface size is not supported by the
backend. This generally indicates that the request is too large.
CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED
Indicates that a required callback for a user-font was not implemented.
CAIRO_STATUS_LAST_STATUS
This is a special value to indicate the number of status values enumerated
at compile time. (This may differ to the number known at run-time.)
The built-in twin font is now called "@cairo:" and supports a limited set
of options like "@cairo:mono". Where are these specified?
cairo_in_fill() now uses HTML Canvas semantics, all edges are inside.
New experimental backends:
CairoScript
New utility:
cairo-trace and cairo-perf-trace
cairo-trace generates a human-readable, replayable, compact(-ish!)
representation of the sequences of drawing commands made by an
application.
Under the util/cairo-script directory is a library to replay traces.
perf/cairo-perf-trace replays traces against multiple backends
and makes useful benchmark reports. This is integrated with
'make perf'. You may collect your own traces or take advantage
of traces collected by the community:
git://git.cairographics.org/git/cairo-traces
(Put this into perf/cairo-traces to run these as part of "make perf".)
There is additional WIP in building a debugging tool for cairo applications
based on CairoScript (currently very preliminary, mostly serves to show
that GtkSourceView is too slow) :
people.freedesktop.org:~ickle/sphinx
Test suite overhaul:
The test suite is undergoing an overhaul, primarily to improve its speed
and utility. (Expect more changes in the near future to improve XFAIL
handling.)
Optimisations:
polygon rasterisation! Joonas implemented the Tor polygon scan converter,
on typical geometry is about 30% faster for the image backend.
Bovine Polaroids! For those not in on the joke, this is the long
awaited "copy-on-write snapshot" or "COW snapshot" support. The
user-visible feature is that including the same image multiple times
into a PDF file should result in only a single instance of that
image in the final output. This is unlike previous versions of cairo
which would generate very large PDF files with multiple copies of
the same image. Adrian says that the PDF is not quite working as
well as it should yet, so we hope for futher improvements before
cairo 1.10.
Bug fixes:
EXTEND_PAD.
Better handling of large scale-factors on image patterns.
Emit /Interpolate for PS,PDF images.
Global glyph cache - cap on the total number of inactive glyphs,
should prove fairer for fonts with larger glyph sets.
Compilation without fontconfig
Improved handling of low-bitdepth sources (e.g. copying the contents
of 16-bit xserver windows)
Regressions:
cairo_traps_extract_region >10x slower. Fix pending.
Still to come:
Region tracking API (ssp) for damage tracking, hit testing etc
mime-surface
An expiremental OpenGL backend?
Tweaks to tessellator, allocations of patterns, delayed
initialisation of the xlib backend (reduce the cairo overhead of
render_bench by ~80%).
