DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (1aeaa33a64f9)

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Release 1.6.4 (2008-04-11 Carl Worth <cworth@cworth.org>)
=========================================================
The cairo community is wildly embarrassed to announce the 1.6.4
release of the cairo graphics library. This release reverts the xlib
locking change introduced in 1.6.4, (and the application crashes that
it caused).  The community would be glad to sack its current release
manager and is accepting applications for someone who could do the job
with more discipline.

Revert 'add missing locking in cairo-xlib'
------------------------------------------
This change was introduced in cairo 1.6.2, but also introduced a bug
which causes many cairo-xlib applications to crash, (with a
segmentation fault inside of XSetClipMask). Instead of attempting
another fix for the broken fix, the change in 1.6.2 has been
reverted. The original bug which the change was addressing has been
present since at least cairo 1.4, so it is not expected that leaving
this bug unfixed will cause any new problems for applications moving
from cairo 1.4 to cairo 1.6.

At this point, the code of cairo 1.6.4 differs from cairo 1.6.0 only
in the fix for the PostScript-printer crashes.

Tweak build to avoid linking with g++
-------------------------------------
Cairo 1.6.4 avoids a quirk in automake that was causing the cairo
library to be linked with g++ and linked against libstdc++ even when
only C source files were compiled for the library.

Release 1.6.2 (2008-04-11 Carl Worth <cworth@cworth.org>)
=========================================================
The cairo community is pleased (but somewhat sheepish) to announce the
1.6.2 release of the cairo graphics library. This is an update to
yesterday's 1.6.0 release with an important fix to prevent cairo's
PostScript output from crashing some printers. This release also
includes a locking fix for cairo's xlib backend to improve thread
safety. There are no changes beyond these two fixes.

Fix for PostScript printer crash
--------------------------------
Adrian Johnson discovered that cairo 1.6.0 was being a bit hard on
PostScript printers, by changing the font matrix very frequently. This
causes some PostScript interpreters to allocate new font objects every
few glyphs, eventually exhausting available resources. The fix
involves leaving translational components of the font matrix as zero,
so that the PostScript interpreter sees an identical font matrix
repeatedly, and can more easily share internal font object resources.

This fix has been tested to resolve the bugs posted here, (for both
Xerox and Dell printers):

	Printing some PDFs from evince is crashing our Xerox printer
	http://bugs.freedesktop.org/show_bug.cgi?id=15348

	Cairo-generated postscript blocks Dell 5100cn
	http://bugs.freedesktop.org/show_bug.cgi?id=15445

Add missing locking in cairo-xlib
---------------------------------
Chris Wilson noticed that cairo 1.6.0 was manipulating an internal
cache of GC object within cairo's Xlib backend without proper
locking. The missing locking could cause failures for multi-threaded
applications. He fixed this in 1.6.2 by adding the missing locks.

Release 1.6.0 (2008-04-10 Carl Worth <cworth@cworth.org>)
=========================================================
The cairo community is quite pleased to announce the 1.6.0 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 cairo 1.4, 1.2, or 1.0. We recommend that
anybody using a previous version of cairo upgrade to cairo 1.6.0.

The most significant new features in this release are dramatically
improved PDF and PostScript[*] output, support for arbitrary X server
visuals (including PseudoColor), a new Quartz backend, and and a new
"win32 printing" backend. See below for more details on these and
other new features.

New dependency on external pixman library (Thanks, Søren!)
----------------------------------------------------------
As of cairo 1.6, cairo now depends on the pixman library, for which
the latest release can be obtained alongside cairo:

	http://cairographics.org/releases/pixman-0.10.0.tar.gz

This library provides all software rendering for cairo, (the
implementation of the image backend as well as any image fallbacks
required for other backends). This is the same code that was
previously included as part of cairo itself, but is now an external
library so that it can be shared by both cairo and by the X server,
(which is where the code originated).

Improved PDF, PostScript, and SVG output (Thanks, Adrian!)
----------------------------------------------------------
Users of the cairo-pdf, cairo-ps, and cairo-svg should see a dramatic
improvement from cairo 1.2/1.4 to 1.6. With this release there are now
almost no operations that will result in unnecessary rasterization in
the PDF and PostScript. Rasterized "image fallbacks" are restricted
only to minimal portions of the document where something is being
drawn with cairo that is beyond the native capabilities of the
document, (this is rare for PDF or SVG, but occurs when blending
translucent objects for PostScript).

This means that the final output will be of higher quality, and will
also be much smaller, and therefore will print more quickly. The
machinery for doing analysis and minimal fallbacks also benefits the
win32-printing surface described below.

In addition to doing less rasterization, the PostScript and PDF output
also has several other improvements to make the output more efficient
and more compatible with specifications.

[*] Note: Just before this release, a bug has been reported that the
PostScript output from cairo can crash some printers, (so far the
following models have been reported as problematic Xerox Workcentre
7228 or 7328 and Dell 5100cn). We will implement a workaround as soon
as we can learn exactly what in cairo's output these printers object
to, (and we could use help from users that have access to misbehaving
printers). This bug is being tracked here:

	Printing some PDFs from evince is crashing our Xerox printer
	http://bugs.freedesktop.org/show_bug.cgi?id=15348

New support for arbitrary X server visuals (Thanks, Keith and Behdad!)
----------------------------------------------------------------------
As of cairo 1.6, cairo should now work with an arbitrary TrueColor or
8-bit PseudoColor X server visual. Previous versions of cairo did not
support these X servers and refused to draw anything. We're pleased to
announce that this limitation has been lifted and people stuck with
ancient display systems need no longer be stuck with ancient software
just because of cairo.

New, supported Quartz backend for Mac OS X (Thanks, Brian and Vladimir!)
------------------------------------------------------------------------
As of cairo 1.6, the cairo-quartz backend is now marked as "supported"
rather than "experimental" as in previous cairo releases. Its API now
has guarantees of API stability into future cairo releases, and its
output quality is comparable to other backends. There have been
significant improvements to cairo-quartz since 1.4. It now uses many
fewer image fallbacks, (meaning better performance), and has greatly
improved text rendering.

New, "win32 printing" backend (Thanks, Adrian and Vladimir!)
------------------------------------------------------------
A new win32-printing surface has been added with an interface very
similar to the original win32 surface, (both accept an HDC
parameter). But this new surface should only be called with a printing
DC, and will result in all drawing commands being stored into a
meta-surface and emitted after each page is complete. This allows
cairo to analyze the contents, (as it does with PDF, PostScript, and
SVG backends), and to do minimal image-based fallbacks as
necessary. The analysis keeps things as efficient as possible, while
the presence of fallbacks, (when necessary), ensure the consistent,
high-quality output expected from cairo.

Robustness fixes (Thanks, Chris!)
---------------------------------
There has been a tremendous number of improvements to cairo's
robustness. Areas that have been improved include:

	* Proper reporting of errors

	* Responding correctly to invalid input

	* Avoiding integer overflows

	* Avoiding memory leaks on error-recovery paths

	* Making reference counting thread safe

	* Exhaustive testing of memory allocation points

Other fixes (Thanks, everybody!)
--------------------------------
Cairo's internal fixed-point representation has been changed from
16.16 to 24.8. This has a direct impact on applications as it allows
much larger objects to be drawn before internal limits in cairo make
the drawing not work.

The CAIRO_EXTEND_PAD mode is now fully supported by surface
patterns. This mode allows applications to use cairo_rectangle and
cairo_fill to draw scaled images with high-quality bilinear filtering
for the internal of the image, but without any objectionably blurry
edges, (as would happen with the default EXTEND_NONE and cairo_paint).

Rendering with CAIRO_ANTIALIAS_NONE has been fixed to be more
predictable, (previously image rendering and geometry rendering would
be slightly misaligned with respect to each other).

The reference manual at http://cairographics.org/manual now documents
100% of the functions and types in cairo's public API.

API additions
-------------
Several small features have been added to cairo with new API functions:

cairo_format_stride_for_width

    Must be called to compute a properly aligned stride value before
    calling cairo_image_surface_create_for_data.

cairo_has_current_point

    Allows querying if there is a current point defined for the
    current path.

cairo_path_extents

    Allows querying for path extents, (independent of any fill or
    stroke parameters).

cairo_surface_copy_page
cairo_surface_show_page

    Allow beginning a new document page without requiring a cairo_t
    object.

cairo_ps_surface_restrict_to_level
cairo_ps_get_levels
cairo_ps_level_to_string
cairo_ps_surface_set_eps

    Allow controlling the Post PostScript level, (2 or 3), to
    target, as well as to generate Encapsulated PostScript (EPS).

cairo_quartz_font_face_create_for_cgfont

    Create a quartz-specific cairo_font_face_t from a CGFontRef.

cairo_win32_font_face_create_for_logfontw_hfont

    Create a win32-specific cairo_font_face from a LOGFONTW and an
    HFONT together.

Thanks, Everyone!
-----------------
I've accounted for 32 distinct people with attributed code added to
cairo between 1.4.14 and 1.6.0, (their names are below). That's an
impressive number, but there are certainly dozens more that
contributed with testing, suggestions, clarifying questions, and
encouragement. I'm grateful for the friendships that have developed as
we have worked on cairo together. Thanks to everyone for making this
all so much fun!

Adrian Johnson, Alp Toker, Antoine Azar, Behdad Esfahbod,
Benjamin Otte, Bernardo Innocenti, Bertram Felgenhauer,
Boying Lu, Brian Ewins, Carl Worth, Chris Heath, Chris Wilson,
Claudio Ciccani, Emmanuel Pacaud, Jeff Muizelaar, Jeremy Huddleston,
Jim Meyering, Jinghua Luo, Jody Goldberg, Jonathan Gramain,
Keith Packard, Ken Herron, Kouhei Sutou, Kristian Høgsberg,
Larry Ewing, Martin Ejdestig, Nis Martensen, Peter Weilbacher,
Richard Hult, Shailendra Jain, Søren Sandmann Pedersen,
Vladimir Vukicevic

Snapshot 1.5.20 (2008-04-04 Carl Worth <cworth@cworth.org>)
===========================================================
This is the tenth snapshot in cairo's unstable 1.5 series. It comes
just two days (and only one working day) after the 1.5.18
snapshot. The quick snapshot is due to two embarrassing bugs (both
affecting cairo-xlib) that had been introduced in the 1.5.18
snapshot. The fixes for these are described below along with a few
other fixes, (which hopefully aren't introducing new bugs this time).

cairo-xlib
----------
Revert fix from 1.5.18 to allow pattern expansion based on the filter
mode. This fix seemed so boring, (the use case it addresses is almost
never used in practice), that it didn't even get mentioned in the
1.5.18 release notes. However, the "fix" happened to break rendering
that is always used resulting in corrupt image rendering in mozilla,
evolution, and probably everything else that uses cairo.

Fix to avoid BadMatch errors in cairo_surface_create_similar. These
were introduced, (inadvertently, of course), as part of the fix in
1.5.18 for creating similar surfaces without the Render
extension. Again, thanks to mozilla, (and Vladimir Vukicevic in
particular), for noticing our mistake.

general
-------
Correctly handle an in-error surface in
cairo_surface_write_to_png. Previously this function would cause an
assertion failure if you gave it a finished surface. Now it cleanly
returns a CAIRO_STATUS_SURFACE_FINISHED result instead.

Avoid potentially infinite wandering through memory inside
_cairo_hull_prev_valid. Thanks to Jonathan Watt for noticing this
problem:

	https://bugzilla.mozilla.org/show_bug.cgi?id=306649#c21

cairo-pdf
---------
Fix generation of "soft" masks made by drawing to a similar surface
and then calling cairo_mask_surface() with it.

cairo-svg
---------
Fix for code that uses cairo_mask() on an intermediate surface which
is later passed to cairo_mask_surface().

Snapshot 1.5.18 (2008-04-05 Carl Worth <cworth@cworth.org>)
===========================================================
This is the ninth snapshot in cairo's unstable 1.5 series. It comes
just 4 days after the 1.5.16 snapshot. We had hoped to not need
another snapshot before the final 1.6.0 release, but several critical
bugs were found and fixed in the last few days, so we thought it
important to let people test the fixes with this snapshot. See below
for details.

documentation
-------------
The README now lists necessary dependencies.

Various graphics state defaults are now documented, (source pattern is
opaque black, line width is 2.0, line join is miter, line cap is butt,
miter limit is 10.0, etc.).

general
-------
Several cleanups have been made along many error-path returns,
(carefully propagating up the original error status values, cleaning
up memory leaks during error recovery, etc.). This is yet another in
Chris "ickle" Wilson's long series of error-handling cleanups during
the 1.5 series.

Avoid undesired clipping when drawing scaled surface patterns with
bilinear filtering.

cairo-pdf
---------
Fix emission of 1-bit alpha masks in PDF output.

Fix a bug that would cause glyphs to be misplaced along the Y axis:

    http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=%23474136

    Originally, an issue about a crash, but later leading to the
    misplaced glyphs issue being discovered.

cairo-ps
--------
Fix misplaced glyphs in cairo's PostScript output.

    This issue occurs when consecutive glyphs are placed far
    apart. This case is exercised by the new ft-show-glyphs-table test
    case, which was originally inspired by the Debian bug #23474136
    mentioned above.

Fix more misplaced glyphs in cairo's PostScript output:

    The issue here showed up under very particular circumstance, (when
    converting a PDF file with a CFF font with CID Identity-H encoding
    and using glyph 0, (defined by the CFF specification as .notdef)
    as a space instead). More concretely, this problem appeared when
    converting the UbuntuDesktop.pdf file mentioned in this bug
    report:

	https://bugs.freedesktop.org/show_bug.cgi?id=15348#c3

    As usual with arcane font-encoding-specific bugs like this, many
    thanks to Adrian Johnson for his magical ability to dive into
    specifications and emerge almost instantaneously with fixes. And
    thanks to Sebastien Bacher for bringing the bug to our attention.

cairo-xlib
----------
Fix serious failure on X servers without the Render extension.

    Since the 1.5.14 snapshot (with support for PseudoColor visuals),
    any application attempting to create a "similar" xlib surface would
    fail on an X server without the Render extension. Thanks to
    Frederic Crozat for pointing out that cairo's test suite was
    entirely failing when run against Xvfb.

Avoid crashing cairo-xlib applications for too-large glyphs

    Naively sending glyphs of any size to the X server will eventually
    violate the X limit on maximum request sizes. We now properly
    detect when a glyph would be too large and use existing fallbacks
    to render the glyph rather than trying to send it to the X server.

Enable the buggy_repeat workaround for Xorg servers < 1.4

    We have determined that Xorg 1.3.0 (as packaged in Fedora 8 at
    least) has a bug that can result in an X server crash when cairo
    uses certain X Render repeat operations, (as exercised by cairo's
    extend-reflect test). We avoid this crash by using fallbacks
    whenever a repeating surface is needed for any Xorg server with a
    version less than 1.4. This is slower, but should prevent the
    crash.

    (Meanwhile, there appears to be a separate bug where some X
    servers or specific X-server drivers will use random pixmap data
    when asked to draw a repeating surface. The buggy_repeat
    workaround would also avoid those problems, but we have not yet
    characterized whether the new "version < 1.4" is a good
    characterization of those problems or not.)

cairo-quartz-font
-----------------
Implement cairo_font_extents for this backend.

The cairo-quartz-font implementation added in the 1.5.14 snapshot was
entirely missing support for the cairo_font_extents function. Thanks to
Richard Hult for pointing out this obvious shortcoming, (and obvious
lack of coverage in our test suite):

	CGFont backend returns 0 font extents
	https://bugs.freedesktop.org/show_bug.cgi?id=15319

Snapshot 1.5.16 (2008-04-01 Carl Worth <cworth@cworth.org>)
===========================================================
This is the eighth snapshot in cairo's unstable 1.5 series. It comes
less than two weeks after the 1.5.14 snapshot and it really is a
legitimate snapshot, (in spite of sharing this date with that of many
bogus announcements). The major change in this snapshot is that the
cairo-quartz backend is now officially "supported", including new API
to construct a font face from a CGFontRef . Also several bug fixes
have been fixed in many backends. See below for details.

general
-------
Cairo now depends on pixman 0.10.0 which was recently released. The
latest pixman release can always be found alongside cairo releases at:

   http://cairographics.org/releases

Increase the precision of color stops for gradients. This fixes a
regression in gradient rendering that had been present since the
1.5.12 snapshot.

paginated (all of ps, pdf, svg, and win32-printing)
---------------------------------------------------
Fix assertion failure when some drawing elements are outside the page
boundaries, (this bug was noticed when using Inkscape to print a
drawing with landscape orientation to a portrait-oriented piece of
paper).

cairo-ps
--------
Fix of bug causing incorrect glyph positioning.

Fix handling of CAIRO_OPERATOR_SOURCE.

cairo-pdf
---------
More reduction of unnecessary digits of precision in PDF output.

Fix handling of CAIRO_OPERATOR_SOURCE.

cairo-svg
---------
Fix bug in usage of libpng that was preventing cairo_mask from working
with the svg backend.

Fix transformation of source pattern for cairo_stroke().

cairo-win32-printing
--------------------
Fix fallback resolution, (thanks again to inkscape users/developers
for helping us find this one).

cairo-quartz
------------
Mark the cairo-quartz backend as "supported" rather than
"experimental". This means the following:

    * The backend will now be built by default (if possible).

    * We are committing that the backend-specific API (as published in
      cairo-quartz.h) are stable and will be supported in all future
      cairo 1.x releases.

    * We are committing that the output quality of this backend
      compares favorably with other cairo backends, (and that quality
      is ensured by good results from the cairo test suite).

    * We recommend that distributions build and distribute this
      backend when possible.

Note that the cairo_quartz_image API (in cairo-quartz-image.h) is
still experimental, will not build by default, (pass
--enable-quartz-image to configure to build it), and may see API
changes before it is marked as "supported" in a future release.

Put the CAIRO_FONT_TYPE_ATSUI name back into
cairo-deprecated.h. Without this, the cairo 1.5.14 snapshot broke all
builds for applications using the C++ cairomm bindings (and perhaps
others) which have the CAIRO_FONT_TYPE_ATSUI name in their header
files. This breakage happened even for applications not using
cairo-quartz at all.

    Note: Even though the CAIRO_FONT_TYPE_ATSUI name is provided to
    avoid this build breakage, we still recommend that bindings and
    applications move to the new, and more accurate,
    CAIRO_FONT_TYPE_QUARTZ name.

Replace the implementation of cairo-quartz-font to use CFFont instead
of ATSUI. The CGFont API is a better fit than ATSUI, and this new
implementation is also more correct than the old one as well.

This also adds the following new API call:

	cairo_public cairo_font_face_t *
	cairo_quartz_font_face_create_for_cgfont (CGFontRef font);

The previous cairo_quartz_font_face_create_for_atsu_font_id function
continues to exist and is part of the supported API going
forward. (However, the old name of that same function, which was
cairo_atsui_font_face_create_for_atsu_font_id is officially
deprecated. Any source code using the old name should be updated to
use the new name.)

Fix transformation of source pattern for cairo_stroke().

cairo-win32
-----------
Avoid crash in create_similar is cairo_win32_surface_create fails.

Snapshot 1.5.14 (2008-03-20 Carl Worth <cworth@cworth.org>)
===========================================================
This is the seventh snapshot in cairo's unstable 1.5 series. It comes
3 weeks after the 1.5.12 snapshot. This snapshot includes support for
arbitrary X server visuals, (including PseudoColor), which was the
final remaining cairo-specific item on the cairo 1.6 roadmap. It also
includes a huge number of improvements to the cairo-quartz backend. So
this is effectively a cairo 1.6 release candidate. We expect very few
changes from now until 1.6 and only for specific bug fixes.

API Change
----------
Rename ATSUI font backend to Quartz font backend. This affects the
following usage:

	--enable-atsui		-> --enable-quartz-font
	CAIRO_HAS_ATSUI_FONT 	-> CAIRO_HAS_QUARTZ_FONT
	CAIRO_FONT_TYPE_ATSUI	-> CAIRO_FONT_TYPE_QUARTZ

	cairo_atsui_font_face_create_for_atsu_font_id ->
	cairo_quartz_font_font_create_for_atsu_font_id

This API change is justified by the cairo-quartz backend still be
marked as "experimental" rather than "supported", (though this is one
step toward making the change to "supported" before 1.6). Cairo will
still provide ABI compatibility with the old symbol name, however.

paginated (all of ps, pdf, svg, and win32-printing)
---------------------------------------------------
Optimize by not analyzing an image surface for transparency more than
once, (previously all images were analyzed twice).

cairo-ps and cairo-pdf
----------------------
Avoiding emitting a matrix into the stroke output when unnecessary,
(making output size more efficient).

Reduce rounding error of path shapes by factoring large scale factors
out of the path matrix, (ensuring that a fixed-number of printed
digits for path coordinates contains as much information as possible).

Reduce excess digits for text position coordinates. This makes the
output file size much smaller without making the result any less
correct.

cairo-ps
--------
Eliminate bug causing extraneous text repetition on Linux PostScript
output in some cases.

	See: Mozilla Bug 419917 – Printed page contents are reflected
	inside bordered tables (Linux-only)

	https://bugzilla.mozilla.org/show_bug.cgi?id=419917

Optimize output when EXTEND_PAD is used.

cairo-pdf
---------
Fix to not use fill-stroke operator with transparent fill, (else PDF
output doesn't match the cairo-defined correct result). See:

	https://bugs.launchpad.net/inkscape/+bug/202096

cairo-svg
---------
Fix stroke of path with a non-solid-color source pattern:

	http://bugs.freedesktop.org/show_bug.cgi?id=14556

cairo-quartz
------------
Fix text rendering with gradient or image source pattern.

Handling antialiasing correctly for cairo_stroke(), cairo_clip(), and
cairo_show_text()/cairo_show_glyphs().

Correctly handle gradients with non-identity transformations:

	Fixes http://bugs.freedesktop.org/show_bug.cgi?id=14248

Add native implementation of REPEAT and REFLECT extend modes for
gradients.

Fix implementation for the "unbounded" operators, (CAIRO_OPERATOR_OUT,
_IN, _DEST_IN, and _DEST_ATOP).

Correctly handle endiannees in multi-architecture compiles on Mac OS
X.

Avoid behavior which would cause Core Graphics to print warnings to
the console in some cases.

cairo-win32
-----------
Fix handling of miter limit.

cairo-win32-printing
--------------------
Fix to not use a 1bpp temporary surface in some cases while printing,
(so grayscale data is preserved rather than just becoming black and
white).

cairo-xlib
----------
Add support for rendering to arbitrary TrueColor X server
visuals. This fixes at least the following bugs:

	cairo doesn't support 8-bit truecolor visuals
	https://bugs.freedesktop.org/show_bug.cgi?id=7735

	cairo doesn't support 655 xlib format
	https://bugs.freedesktop.org/show_bug.cgi?id=9719

Add support for rendering to 8-bit PseudoColor X server visuals. This
fixes the following bug:

	Cairo doesn't support 8-bit pseudocolor visuals
	https://bugs.freedesktop.org/show_bug.cgi?id=4945

Snapshot 1.5.12 (2008-02-28 Carl Worth <cworth@cworth.org>)
===========================================================
This is the sixth snapshot in cairo's unstable 1.5 series. It comes 1
week after the 1.5.10 snapshot. This snapshot includes the
long-awaited change from 16.16 to 24.8 fixed-point values, (see below
for why you should care).  It also includes several backend-specific
bug fixes.

24.8 fixed-point format
-----------------------
Cairo has always converted path coordinates to a fixed-point
representation very early in its processing. Historically, this has
been a 32-bit representation with 16 bits of integer for the
device-pixel grid and 16 bits of sub-pixel positioning. The choice of
16 bits for the integer coordinate space was based on the 16-bit limit
for X Window drawables.

This 16-bit limit has proven problematic for many applications. It's
an especially vexing problem when targeting non-X backends that don't
have any 16-bit restriction. But even when targeting cairo-xlib, it's
often desirable to draw a large shape, (say a background rectangle),
that extends beyond the surface bounds and expect it to fill the
surface completely, (rather than overflowing and triggering random
behavior).

Meanwhile, nobody has ever really needed 16 bits of sub-pixel
precision.

With this snapshot, the fixed-point system is still in place and is
still using a 32-bit representation, (future versions of cairo might
move entirely to floating-point when targeting PDF output for
example). But the representation now provides 24 bits of pixel
addressing and only 8 bits of sub-pixel positioning. This should give
a much less stifling space to many applications.

However, the underlying pixman library still has 16-bit limitations in
many places, (it has its roots in the X server as well). Until those
are also fixed, applications targeting cairo image surfaces, or
hitting software fallbacks when targeting other surfaces will still
encounter problems with device-space values needing more than 16
integer bits.

generic fixes
-------------
Add a few tests to the test suite to increase coverage.

Cleanup a few error-handling paths, (propagate error correctly).

cairo-ft
--------
Fix handling of font sizes smaller than 1 device pixel.

cairo-pdf
---------
Fix to properly save/restore clip when analyzing meta-surface
patterns, (fixing a couple of test-suite failures).

Implement native support for CAIRO_OPERATOR_SOURCE when the source
pattern is opaque.

Emit rectangles as PDF rectangles ("re" operator) rather than as
general paths.

cairo-ps
--------
Fix to work properly with the 16.16->24.8 change.

cairo-svg
---------
Fix CAIRO_EXTEND_REFLECT by using an image fallback, (there's no
direct SVG support for reflected patterns).

Fix the use of alpha-only masks, (such as CAIRO_FORMAT_A8).

cairo-quartz
------------
Add new API for efficiently using image data as a source:

	cairo_surface_t *
	cairo_quartz_image_surface_create (cairo_surface_t *image_surface);

	cairo_surface_t *
	cairo_quartz_image_surface_get_image (cairo_surface_t *surface);

For full documentation, see:

	http://cairographics.org/manual/cairo-Quartz-Surfaces.html#cairo-quartz-image-surface-create

Several fixes for cairo_mask().

cairo-atsui
-----------
Change default from from Monaco to Helvetica to be more consistent
with other font backends.

Snapshot 1.5.10 (2008-02-20 Carl Worth <cworth@cworth.org>)
===========================================================
This is the fifth snapshot in cairo's unstable 1.5 series. It comes 3
weeks after the 1.5.8 snapshot. This snapshot adds one new API
function, (cairo_has_current_point), and the usual mix of
improvements, (more efficient PostScript/PDF output, optimized
stroking), and fixes (more robust error-handling, etc.). See below for
details.

New API
-------
Add a new function to query if there is a current point:

	cairo_bool_t
	cairo_has_current_point (cairo_t *cr);

There is no current point immediately after cairo_create(), nor after
cairo_new_path() or cairo_new_sub_path(). There is a current point
after any of the path-creation functions, (cairo_move_to,
cairo_line_to, cairo_curve_to, etc.).

With this new function, we also revert the change of the return type
of cairo_get_current_point from cairo 1.5.8, (it's now a void function
again).

Optimizations
-------------
Optimize stroking code to avoid repeated calculation of redundant
values, (particularly significant for very large, offscreen paths).

General fixes
-------------
Patch a few more potential buffer overruns, (due to integer
overflow).

Many fixes and improvements to cairo's error-handling, (ensure that
correct error values are returned, clean up memory leaks on
error-handling paths, etc.).

Fix a potential infinite loop when stroking a spline with a pen that
has been transformed to a line segment.

Remove treating NULL as a synonym for a valid cairo_font_options_t*
with default values, (a change that had been introduced as of cairo
1.5.8).

Remove the altered handling of tolerance and fallback-resolution that
had been introduced as of cairo 1.5.4.

cairo-xlib
----------
Pass the original Drawable, (as opposed to the root window), to
XCreatePixmap when creating a similar surface. This gives the X server
more information so that it can be clever and efficient.

cairo-pdf
---------
Fix the rendering of repeating and reflecting patterns.

Ensure miter limit is always >= 1, (smaller limits are not meaningful,
but they can cause some PDF viewers to fail to display pages).

Generate more efficient output when the same path is used for both
fill and stroke.

cairo-ps
--------
Start sharing much of the cairo-pdf code rather than implementing very
similar code in cairo-ps.

Implement native support for repeating and reflecting linear
gradients.

Implement reflected surface patterns.

Ensure miter limit is always >= 1, (smaller limits are not meaningful,
but they can cause some PostScript viewers to crash).

Generate PostScript that will perform more efficiently and use less
memory on printers, (use currentfile instead of a giant string array
for image data, and avoid using PostScript patterns for paint() and
fill() when possible).

cairo-svg
---------
Avoid unnecessary rasterization when copying a "similar" surface to
another svg surface, (allow the SOURCE operator to be implemented with
all-vector operations if there are no underlying objects).

cairo-atsui
-----------
Eliminate infinite loop when attempting to render an empty string.

Snapshot 1.5.8 (2008-01-30 Carl Worth <cworth@cworth.org>)
==========================================================
This is the fourth snapshot in cairo's unstable 1.5 series. It comes 2
weeks after the 1.5.6 snapshot. It adds a few new API functions. Most
notably all callers of cairo_image_surface_create_for_data should now
be calling cairo_format_stride_for_width to compute a legal stride
value. See below for more details.

New API in cairo 1.5.8
----------------------
We've added a new function that should be called to compute a legal
stride value before allocating data to be used with
cairo_image_surface_create_for_data:

	int
	cairo_format_stride_for_width (cairo_format_t	format,
				       int		width);

We've also added a new cairo_path_extents function that can be used to
compute a bounding box for geometry such as a single line segment,
(contrast with cairo_path_extents and cairo_stroke_extents):

	void
	cairo_path_extents (cairo_t *cr,
			    double *x1, double *y1,
			    double *x2, double *y2);

And finally, we've added a function to allow for querying the
XRenderPictFormat of a cairo-xlib surface:

	XRenderPictFormat *
	cairo_xlib_surface_get_xrender_format (cairo_surface_t *surface);

API changes
-----------
Fix return types of cairo_surface_show_page and
cairo_surface_copy_page. This is an API change to functions that are
new in the 1.5 series, so not an API break compared to any stable
cairo release, (1.0.x, 1.2.x, 1.4.x).

Change the return type of cairo_get_current_point() from void to
cairo_status_t. This allows the caller to receive a
CAIRO_STATUS_NO_CURRENT_POINT value to distinguish the a current point
at the origin from no current point existing.

Performance improvement
-----------------------
Improve performance of clipping by using an optimized code path
internally, (with the ADD operator instead of IN).

General bug fixes
-----------------
Fix various cairo_*_extents functions to initialize the return-value
variables even in the case of a cairo_t in error.

Treat NULL as a legitimate value for cairo_font_options_t*. [NOTE:
On discussion afterwards, we decided against this change so it has
been removed as of cairo 1.5.10.]

Fix rendering with CAIRO_ANTIALIAS_NONE to be more predictable, (that
is, to avoid seams appearing when geometry and imagery share an
identical edge). Portions of this fix are in the pixman library and
will appear in a future release of that library.

Avoid triggering an error for a font size of 0.

Miscellaneous changes
---------------------
Require pixman >= 0.9.6.

There has been a tremendous amount improvement to cairo's
documentation. We're delighted that 100% of the public API has at
least some documentation in the API reference manual. Many thanks to
Behdad Esfahbod and Nis Martensen for leading this effort.

cairo-pdf and cairo-ps
----------------------
Eliminate failure when a Type 1 font is embedded with an explicit
glyph 0.

cairo-pdf
---------
Implement a more correct and more efficient approach for patterns with
an extend mode of CAIRO_EXTEND_REFLECT.

cairo-ps
--------
Fix image masks to properly pack and pad mask bits.

cairo-quartz
------------
Take care to only use DrawTiledImage for integer-aligned images, (and
use slower paths to get the correct result in other cases).

cairo-win32
-----------
Fix for older versions of mingw.

Improve the handling of the clipping with the win32 and win32-printing
surfaces.

Fix rendering of non black/white text.

Snapshot 1.5.6 (2008-01-15 Carl Worth <cworth@cworth.org>)
==========================================================
This is the third snapshot in cairo's unstable 1.5 series. It comes
about 6 weeks after the 1.5.4 snapshot. The only API addition compared
to 1.5.4 is very minor, (a new value CAIRO_STATUS_TEMP_FILE_ERROR).
The remainder of the changes are the usual accumulation of bug fixes
and improvements. See below for details.

General bug fixes
-----------------
Fix handling of fonts that contain a mixture of outline and bitmapped
glyphs. There was a change in this handling in 1.5.4 that improved
some cases and also regressed other cases. Now, all cases should be
handled quite well.

Fix alignment issues that were causing SIGBUS failures on SPARC.

Fix a regression (which first appeared in 1.5.2) where stroking under
a large scale would sometimes incorrectly replace a miter join with a
bevel join. (Thanks to Keith Packard.)

Fix reporting of zero-sized extents to be {0,0} rather than
{INT_MAX,INT_MIN}. This avoids several integer overflow and
allocations of massive regions in some cases.

Fix failures of gradients with no stops, (quartz, ps, and pdf).

Fix handling of Type 1 fonts on Windows platforms.

Fix handling of Type 1 fonts with no specific family name in the font
itself, (generate a CairoFont-x-y name).

Handle NULL string values in cairo_show_text, cairo_show_glyphs, and
friends.

Many robustness improvements along error-handling paths, (thanks as
always, to Chris "ickle" Wilson).

Various other minor fixes.

Paginated backends (PDF/PostScript/win32-printing)
--------------------------------------------------
Avoid unnecessary rasterization when using a paginated surface as a
source, (such as drawing from one pdf surface to another).

Fix replaying of paginated surface with more than one level of push/pop
group.

cairo-xlib
----------
Fix xlib backend to not consider recent X server release as having a
buggy repeat implementation in the Render extension.

cairo-pdf
---------
Fix PDF output to avoid triggering very slow rendering in PDF viewers,
(avoid starting and stopping the content stream for each pattern
emission).

Support CAIRO_OPERATOR_SOURCE in cases where there is nothing below
the object being drawn.

Fix to avoid seams appearing between multiple fallback regions.

cairo-ps (PostScript)
---------------------
Use correct bounding box in Type 3 fonts.

Fix several bugs in cairo's PostScript output. These include making
the PostScript output more compatible with recent versions of
ghostscript that are more strict about Type 3 fonts, for
example.

Fix for win32 to not attempt to create temporary files in the root
directory, (where the user may not have write permission).

Avoid generating Level 3 PostScript if Level 2 is sufficient. Also,
add code in output documents to alert the user if Level 3 PostScript
is handed to a device that cannot handle PostScript beyond Level
2.

cairo-directfb
--------------
Various performance optimizations.

Fixed support for small surfaces (less than 8x8).

Provide support for environment variables CAIRO_DIRECTFB_NO_ACCEL to
disable acceleration and CAIRO_DIRECTFB_ARGB_FONT to enable ARGB fonts
instead of A8.

cairo-os2
---------
Allow OS/2 APIs instead of C library allocation functions.

Snapshot 1.5.4 (2007-12-05 Carl Worth <cworth@cworth.org>)
==========================================================
This is the second snapshot in cairo's unstable 1.5 series. It comes
just over 1 month after the 1.5.2 snapshot. There are no API changes
or additions in 1.5.4 compared to 1.5.2, but there are several bug
fixes, and some optimizations. Most of these apply to particular
backends. See below for details.

General improvements
--------------------
Use less memory for spline approximation calculations.

Change how the tolerance value is interpreted with regard to
fallback-resolution. [Note: On further discussion, we decided against
this change for now. It is removed as of cairo 1.5.10.]

Fix precision of floating-point values in vector-output backends to
avoid rounding errors with very small numbers.

Xlib improvements
-----------------
Fix bug in glyph rendering with xlib, (due to everything being clipped
out). This was a regression in the 1.5.2 snapshot that was visible in
the GIMP, for example. See:

	cairo 1.5.2 causes font problems in GIMP 2.4 status bar and evolution 2.12.1
	https://bugs.freedesktop.org/show_bug.cgi?id=13084

PostScript improvements
-----------------------
Fix bug leading to invalid PostScript files when rendering
text, (need "0 0 xyshow" instead of "0 xyshow").

Fix many issues with Type 3 fonts, including making the resulting text
extractable.

Quartz improvements
-------------------
Fix font metrics height value for ATSUI, (helps webkit on GTK+ OS X
layout nicely).

Fix gradients.

Fix EXTEND_NONE mode for patterns.

Fix cairo_quartz_surface_create to properly clear the new surface
in cairo_quartz_surface_create.

Fix to correctly handle 0x0 sized surfaces.

Optimize drawing of ExtendMode::REPEAT patterns for OS X 10.5.

Snapshot 1.5.2 (2007-10-30 Carl Worth <cworth@cworth.org>)
==========================================================
This is the first snapshot in cairo's unstable 1.5 series. It comes 4
months after the 1.4.10 release. This snapshot includes significant
improvements to PDF and PostScript output, which is one of the things
in which we're most interested in getting feedback. There are a couple
of minor API additions, and several optimizations, (primarily in the
"print/vector" backends). And there are dozens of bug fixes and
robustness improvements.

New dependency on external pixman library
-----------------------------------------
A significant change in this snapshot compared to all previous cairo
releases is that cairo now depends on an external "pixman" library for
its software rendering. Previously this same code was compiled
internally as part of cairo, but now the code is separate so that both
cairo and the X server can now share common code, (thanks very much to
Søren Sandmann for his work on separating pixman and maintaining it).

So users will need to acquire and build pixman before being able to
build cairo. The current release is 0.9.6 and can be obtained from
here:

	http://cairographics.org/releases/pixman-0.9.6.tar.gz

 which can be verified with:

	http://cairographics.org/releases/pixman-0.9.6.tar.gz.sha1
	66f01a682c64403a3d7a855ba5aa609ed93bcb9e  pixman-0.9.6.tar.gz

	http://cairographics.org/releases/pixman-0.9.6.tar.gz.sha1.asc
	(signed by Carl Worth)

Major PDF/PostScript improvements
---------------------------------
Adrian Johnson has done some long-awaited work to make cairo's PDF and
PostScript output more interesting than ever before. First, many
operations that previously triggered image fallbacks will now be
rendered as native vectors. These operations include:

	PDF: cairo_push_group, cairo_surface_create_similar,
	cairo_mask, A8/A1 surface sources, repeating/reflecting linear
	gradients.

	PostScript: cairo_push_group, cairo_surface_create_similar,
	gradients, bilevel alpha masks, (for example, all values either 0 or
	255 for an A8 mask).

Not only that, but when an image fallback is required, it will now be
limited to only the necessary region. For example, a tiny translucent
image overlaying a small portion of text would previously caused an
entire PostScript page to be rendered as a giant image. Now, the
majority of that page will be nice text, and there will only be a tiny
image in the output.

Additionally, the PostScript output now carefully encodes text so that
if it is subsequently converted to PDF, the text will be
selectable.

This is very exciting progress, and we're hoping to hear from users
during the 1.5 series about how things have improved, (for example,
inkscape users doing cairo-based PDF export: please let us know how
things look). And feel free to pass your thanks along to Adrian for his excellent work.

NOTE: This much improved PDF output makes more sophisticated use of
functionality in the PDF specification. This means that cairo's output
will sometimes expose bugs in some free software PDF viewers, (evince,
poppler, and xpdf, for example), that are not yet ready for such PDF
files. We're working with the poppler maintainers to get these bugs
fixed as quickly as possible. In the meantime, please double-check
with other PDF viewers if cairo-generated PDF files are not being
rendered correctly. It may be due to a bug in the viewer rather than
in the PDF file that cairo has created.

Robustness improvements
-----------------------
Chris Wilson has made the largest contribution by far to cairo 1.5.2,
(in number of commits). His more than 150 commits include a huge
number of fixes to increase cairo's robustness. These fixes make cairo
more robust against invalid and degenerate input, (NaN, empty path,
etc.), against size-0 malloc calls, against memory leaks on
error-recovery paths, and against other failures during error
handling. He also implemented atomic operations to cairo, and used
them to fix cairo's previously non-thread-safe reference counting,
again improving robustness.

Chris has put a tremendous amount of time and effort into writing
analysis tools for this work, and in running those tools and fixing
the problems they report. We're very grateful for this work, and hope
that all cairo users appreciate the more robust implementation that
results from it.

This work is largely thankless, so it might make sense to notice
sometime that cairo has been running quite smoothly for you, and when
you do, send a quick "thank you" off to Chris Wilson, since it
is all definitely running smoother thanks to his work.

New API
-------
There are no major additions to cairo's core API. The only new,
generic functions are:

	void
	cairo_surface_copy_page (cairo_surface_t *surface);

	void
	cairo_surface_show_page (cairo_surface_t *surface);

which can now be used much more conveniently than the existing
cairo_copy_page and cairo_show_page functions in some
situations. These functions act identically, but require only a
cairo_surface_t* and not a cairo_t*.

All other API additions are specific to particular backends.

New cairo-win32 API (new font face function and "win32 printing" surface)
-------------------------------------------------------------------------
There is a new function for creating a win32 font face for both a
logfontw and an hfont together. This complements the existing
functions for creating a font face from one or the other:

	cairo_font_face_t *
	cairo_win32_font_face_create_for_logfontw_hfont (LOGFONTW *logfont,
							 HFONT font);

There is also a new "win32 printing" surface:

	cairo_surface_t *
	cairo_win32_printing_surface_create (HDC hdc);

This interface looks identical to the original
cairo_win32_surface_create, (both accept and HDC), but the behavior of
this new surface is very different. It should only be called with a
printing DC, and will result in all drawing commands being stored into
a meta-surface and emitted after each page is complete, with analysis
to do as minimal image-based fallbacks as necessary. The behavior and
implementation shares much with the PDF and PostScript backends.

New cairo-ps API (EPS and PostScript level control)
---------------------------------------------------
An often requested feature has been the ability to generate
Encapsulated PostScript (EPS) with cairo. We have that now with the
following very simple API. Just do cairo_ps_surface_create as usual
then call this function with a true value:

	void
	cairo_ps_surface_set_eps (cairo_surface_t       *surface,
				  cairo_bool_t           eps);

[NOTE: As always with snapshots, it's possible---though not very
likely---that the API could still be modified before a final
release. For example, this is the first public cairo function that
accepts a Boolean parameter. I'm generally opposed to Boolean
parameters, but this is probably the one case where I'm willing to
accept one, (namely a "set" function that accepts a single Boolean).]

Also, it is now possible to control what PostScript level to target,
(either level 2 or level 3), with the following new API:

	typedef enum _cairo_ps_level {
	    CAIRO_PS_LEVEL_2,
	    CAIRO_PS_LEVEL_3
	} cairo_ps_level_t;

	void
	cairo_ps_surface_restrict_to_level (cairo_surface_t    *surface,
					    cairo_ps_level_t    level);

	void
	cairo_ps_get_levels (cairo_ps_level_t const  **levels,
			     int                      *num_levels);

	const char *
	cairo_ps_level_to_string (cairo_ps_level_t level);

Improvement for cairo-quartz
----------------------------
Brian Ewins had contributed several improvements to cairo-quartz. These
include an implementation of EXTEND_NONE for linear and radial
gradients, (so this extend mode will no longer trigger image fallbacks
for these gradients), as well as native surface-mask clipping, (only
on OS X 10.4+ where the CGContextClipToMask function is available).

He also fixed a semantic mismatch between cairo and quartz for dashing
with an odd number of entries in the dash array.

We're grateful for Brian since not many quartz-specific improvements
to cairo would be happening without him.

Optimizations
-------------
Optimize SVG output for when the same path is both filled and stroked,
and avoid unnecessary identity matrix in SVG output. (Emmanuel Pacaud).

Optimize PS output to take less space (Ken Herron).

Make PS output more compliant with DSC recommendations (avoid initclip
and copy_page) (Adrian Johnson).

Make PDF output more compact (Adrian Johnson).

Release glyph surfaces after uploading them to the X server, (should
save some memory for many xlib-using cairo application). (Behdad
Esfahbod).

Optimize cairo-win32 to use fewer GDI objects (Vladimir Vukicevic).

win32-printing: Avoid falling back to images when alpha == 255
everywhere. (Adrian Johnson).

win32-printing: Avoid falling back for cairo_push_group and
cairo_surface_create_similar. (Adrian Johnson)

Bug fixes
---------
Avoid potential integer overflows when allocating large buffers
(Vladimir Vukicevic).

Preparations to allow the 16.16 fixed-point format to change to
24.8 (Vladimir Vukicevic).

Fix bugs for unsupported X server visuals (rgb565, rgb555, bgr888, and
abgr8888). (Carl Worth and Vladimir Vukicevic)

Fix bugs in PDF gradients (Adrian Johnson).

Fix cairo-xlib to build without requiring Xrender header
files (Behdad Esfahbod).

Make cairo more resilient in the case of glyphs not being available in
the current font. (Behdad Esfahbod)

Prevent crashes when both atsui and ft font backends are compiled in
(Brian Ewins).

Make font subsetting code more robust against fonts that don't include
optional tables (Adrian Johnson).

Fix CFF subsetting bug, (which manifested by generating PDF files that
Apple's Preview viewer could not read) (Adrian Johnson).

Fixed error handling for quartz and ATSUI backends (Brian Ewins).

Avoid rounding problems by pre-transforming to avoid integer-only
restrictions on transformation in GDI (Adrian Johnson).

Fixed an obscure bug (#7245) computing extents for some stroked
paths (Carl Worth).

Fix crashes due to extreme transformation of the pen, (seems to show
up in many .swf files for some reason) (Carl Worth).

Release 1.4.10 (2007-06-27 Carl Worth <cworth@cworth.org>)
==========================================================
This is the fifth update in cairo's stable 1.4 series. It comes
roughly three weeks after the 1.4.8 release. The most significant
change in this release is a fix to avoid an X error in certain cases,
(that were causing OpenOffice.org to crash in Fedora). There is also a
semantic change to include child window contents when using an xlib
surface as a source, an optimization when drawing many rectangles, and
several minor fixes.

Eliminate X errors that were killing OO.o (Chris Wilson)
--------------------------------------------------------
Cairo is fixed to avoid the X errors propagated when cleaning up
Render Pictures after the application had already destroyed the
Drawable they reference. (It would be nice if the X server wouldn't
complain that some cleanup work is already done, but there you have
it.) This fixes the bug causing OpenOffice.org to crash as described
here:

        XError on right click menus in OOo.
        https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=243811

Use IncludeInferiors when using xlib surface as a source (Ryan Lortie)
----------------------------------------------------------------------
When an xlib surface is used as the source of a draw operation the
contents of child windows are now included in the source data. The
semantics of drawing to xlib surfaces are unchanged (ie: draws are
still clipped by child windows overlapping the destination window).

Optimize drawing of many rectangles (Vladimir Vukicevic)
--------------------------------------------------------
Avoid O(N*N) loop when filling many axis-aligned rectangles, (either
many rectangles as separate sub-paths or due to dashing).

Miscellaneous fixes
-------------------
Fix cairo-perf on Solaris by linking to librt. (Behdad Esfahbod)

Fix make check for systems that require executable files to have a
particular extension. (Behdad Esfahbod)

Eliminate some warnings in cairo-quartz. (Brian Ewins)

Fix build-breaking typo for cairo-directfb. (Chris Wilson)

Release 1.4.8 (2007-06-07 Carl Worth <cworth@cworth.org>)
=========================================================
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 improves performance
dramatically. For example, this reduces the volume of X requests
during text rendering to the same level as Xft.

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
------------------------------
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)

Quartz: fixed 'extend' behaviour for patterns, improved pattern performance,
and a few smaller correctness fixes. (Brian Ewins, Vladimir Vukicevic)

Release 1.4.6 (2007-05-01 Carl Worth <cworth@cworth.org>)
=========================================================
This is the third update in cairo's stable 1.4 series. It comes a
little less than three weeks since the 1.4.4 release. This release
fixes the broken mutex initialization that made cairo 1.4.4 unusable
on win32, OS/2, and BeOS systems. This release also adds significant
improvements to cairo's PDF backend, (native gradients!), and a couple
of performance optimizations, (one of which is very significant for
users of the xlib backend). See below for more details.

Repaired mutex initialization
-----------------------------
We apologize that cairo 1.4.4 did little more than crash on many
platforms which are less-frequently used by the most regular cairo
maintainers, (win32, OS/2, and BeOS). The mutex initialization
problems that caused those crashes should be fixed now. And to avoid
similar problems in the future, we've now started posting pre-release
snapshots to get better testing, (subscribe to cairo@cairographics.org
if you're interested in getting notified of those and testing them).

PDF Improvements
----------------
Thanks to Adrian Johnson, (cairo PDF hacker extraordinaire), we have
several improvements to cairo's PDF backend to announce:

Native gradients:

  As of cairo 1.4.6, cairo will now generate native PDF gradients in
  many cases, (previously, the presence of a gradient on any page
  would force rasterized output for that page). Currently, only
  gradients with extend types of PAD (the default) or NONE will
  generate native PDF gradients---others will still trigger
  rasterization, (but look for support for other extend modes in a
  future release). Many thanks to Miklós Erdélyi as well, who did the
  initial work for this support.

Better compatibility with PDF viewers:

  The PDF output from cairo should now be displayed correctly by a
  wider range of PDF viewers. Adrian tested cairo's PDF output against
  many PDF viewers, identified a common bug in many of those viewers
  (ignoring the CTM matrix in some cases), and modified cairo's output
  to avoid triggering that bugs (pre-transforming coordinates and
  using an identity matrix).

Better OpenType/CFF subsetting:

  Cairo will now embed CFF and TrueType fonts as CID fonts.

Performance optimizations
-------------------------
Faster cairo_paint_with_alpha:

  The cairo_paint_with_alpha call is used to apply a uniform alpha
  mask to a pattern. For example, it can be used to gradually fade an
  image out or in. Jeff Muizelaar fixed some missing/broken
  optimizations within the implementation of this function resulting
  in cairo_paint_with_alpha being up to 4 times faster when using
  cairo's image backend.

Optimize rendering of "off-screen" geometry:

  Something that applications often do is to ask cairo to render
  things that are either partially or wholly outside the current clip
  region. Since 1.4.0 the image backend has been fixed to not waste
  too much time in this case. But other backends have still been
  suffering.

  In particular, the xlib backend has often performed quite badly in
  this situation. This is due to a bug in the implementation of
  trapezoid rasterization in many X servers.

  Now, in cairo 1.4.6 there is a higher-level fix for this
  situation. Cairo now eliminates or clips trapezoids that are wholly
  or partially outside the clip region before handing the trapezoids
  to the backend. This means that the X server's performance bug is
  avoided in almost all cases.

  The net result is that doing an extreme zoom-in of vector-based
  objects drawn with cairo might have previously brought the X server
  to its knees as it allocated buffers large enough to fit all of the
  geometry, (whether visible or not). But now the memory usage should
  be bounded and performance should be dramatically better.

Miscellaneous
-------------
Behdad contributed an impressively long series of changes that
organizes cairo's internals in several ways that will be very
beneficial to cairo developers. Thanks, Behdad!

Behdad has also provided a utility for generating malloc statistics,
(which was used during the great malloc purges of 1.4.2 and
1.4.4). This utility isn't specific to cairo so may be of benefit to
others. It is found in cairo/util/malloc-stats.c and here are Behdad's
notes on using it:

    To build, do:

        make malloc-stats.so

    inside util/, and to use, run:

        LD_PRELOAD=malloc-stats.so some-program

    For binaries managed by libtool, eg, cairo-perf, do:

        ../libtool --mode=execute /bin/true ./cairo-perf
        LD_PRELOAD="../util/malloc-stats.so" .libs/lt-cairo-perf

Finally, the cairo-perf-diff-files utility was enhanced to allow for
generating performance reports from several runs of the same backend
while some system variables were changed. For example, this is now
being used to allow cairo-perf to measure the performance of various
different acceleration architectures and configuration options of the
X.org X server.

Release 1.4.4 (2007-04-13 Carl Worth <cworth@cworth.org>)
=========================================================
This is the second update release in cairo's stable 1.4 series. It
comes just less than a month after 1.4.2. The changes since 1.4.2
consist primarily of bug fixes, but also include at least one
optimization. See below for details.

Of all the work that went into the 1.4.4 release

There have been lots of individuals doing lots of great work on cairo,
but two efforts during the 1.4.4 series deserve particular mention:

Internal cleanup of error handling, (Chris Wilson)
--------------------------------------------------
Chris contributed a tremendous series of patches (74 patches!) to
improve cairo's handling of out-of-memory and other errors. He began
by adding gcc's warn_unused_attribute to as many functions as
possible, and then launched into the ambitious efforts of adding
correct code to quiet the dozens of resulting warnings.

Chris also wrote a custom valgrind skin to systematically inject
malloc failures into cairo, and did all the work necessary to verify
that cairo's performance test suite runs to completion without
crashing.

The end result is a much more robust implementation. Previously, many
error conditions would have gone unnoticed and would have led to
assertion failures, segmentation faults, or other harder-to-diagnose
problems. Now, more than ever, cairo should cleanly let the user know
of problems through cairo_status and other similar status
functions. Well done, Chris!

More malloc reduction, (Mathias Hasselmann)
-------------------------------------------
After 1.4.0, Behdad launched an effort to chase down excessive calls
to malloc within the implementation of cairo. He fixed a lot of
malloc-happy objects for 1.4.2, but one of the worst offenders,
(pixman regions), was left around. Mathias contributed an excellent
series of 15 patches to finish off this effort.

The end result is a cairo that calls malloc much less often than it
did before. Compared to 1.4.2, 55% of the calls to malloc have been
eliminate, (and 60% have been eliminated compared to 1.4.0). Well
done, Mathias!

Other improvements since 1.4.2
------------------------------
• Centralize mutex declarations (will reduce future build breaks),
  (Mathias Hasselmann)

• Reduce malloc by caching recently freed pattern objects (Chris
  Wilson)

• Fix some broken composite operations (David Reveman)
	https://bugs.freedesktop.org/show_bug.cgi?id=5777

Backend-specific fixes
----------------------
PDF:
 • Use TJ operator for more compact representation of glyphs (Adrian
   Johnson)

 • Fix glyph positioning bug when glyphs are not horizontal
	http://lists.freedesktop.org/archives/cairo/2007-April/010337.html

win32:
 • Fix crash when rendering with bitmap fonts (Carl Worth)
	https://bugzilla.mozilla.org/show_bug.cgi?id=376498

xlib:
 • Turn metrics-hinting on by default (Behdad Esfahbod)

 • Fix edge-effect problem with transformed images drawn to xlib
   (Behdad Esfahbod)
	https://bugs.freedesktop.org/show_bug.cgi?id=10508

 • Avoid dereferencing a NULL screen. (Chris Wilson)
	https://bugs.freedesktop.org/show_bug.cgi?id=10517

Quartz/ATSUI:
 • Fix scaling of glyph surfaces
   (Brian Ewins)
	https://bugs.freedesktop.org/show_bug.cgi?id=9568

 • Fix compilation failure when both xlib and quartz enabled
   (Brian Ewins)

 • Fix rounding bug leading to incorrectly positioned glyphs
   (Robert O'Callahan)
	https://bugs.freedesktop.org/show_bug.cgi?id=10531

Release 1.4.2 (2007-03-19 Carl Worth <cworth@cworth.org>)
=========================================================
This is the first update release in cairo's stable 1.4 series. It
comes just less than 2 weeks after 1.4.0. We hadn't anticipated an
update this early, but we've managed to collect some important fixes
that we wanted to get out to cairo users as soon as possible, (6 fixes
for crashes, 1 case where graphical elements would not be drawn at
all, a handful of backend-specific bugs, and several important build
fixes).

There's almost nothing but bug fixes in this release, (see below one
optimization that Behdad did sneak in), so we recommend that everyone
upgrade to this release when possible.

Thanks to the many people that worked to fix these bugs, and those
that did the work to report them and to test the fixes, (wherever
possible both names are credited below).

Critical fixes
--------------
• Fix a crash due to a LOCK vs. UNLOCK typo (M. Drochner fixing Carl
  Worth's embarrassing typo).

  http://bugs.freedesktop.org/show_bug.cgi?id=10235

• Fix potential buffer overflow, which on some systems with a checking
  variant of snprintf would lead to a crash (Adrian Johnson, Stanislav
  Brabec, and sangu).

  https://bugs.freedesktop.org/show_bug.cgi?id=10267
  https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=232576

• Fix a crash in cairo_stroke_extents or cairo_in_stroke when line
  width is 0.0. (Carl Worth and Sebastien Bacher)

  https://bugs.freedesktop.org/show_bug.cgi?id=10231

• Fix a crash on certain combinations of X server/video drivers (Carl
  Worth and Tomas Carnecky).

  https://bugs.freedesktop.org/show_bug.cgi?id=10250

• Fix a crash due to mishandling of invalid user input (Carl Worth and
  Alexander Darovsky).

  https://bugs.freedesktop.org/show_bug.cgi?id=9844

• xlib: Cleanup server-side glyph caches on XCloseDisplay. This
  eliminated a crash detected by the perf suite, (and that
  applications could have run into as well). (Chris Wilson)

Other bug fixes
---------------
• Fix for some geometry which simply disappeared under some
  transformations---a stroked line with an extreme skew in X, for
  example (Carl Worth and Jonathan Watt).

  https://bugzilla.mozilla.org/show_bug.cgi?id=373632

• SVG: Fix radial gradients for CAIRO_EXTEND_REFLECT and when r0 > r1
  (Emmanuel Pacaud).

• PDF: Set page group color space to DeviceRGB.

  This fixes incorrect (muddy) transparent colors when rendering cairo
  PDF output in some viewers. (Adrian Johnson, Adam Goode, and
  MenTaLguY).

  http://lists.freedesktop.org/archives/cairo/2006-November/008551.html

• win32: Return correct metrics when hinting is off, and fix font
  descent computation (Behdad Esfahbod).

• quartz: Fix glyph interfaces to correctly return user-space rather
  than device-space coordinates (Brian Ewins).

  https://bugs.freedesktop.org/show_bug.cgi?id=9568

• xcb: Fix parameter-order confusion with xcb_create_pixmap, which now
  makes all tests that pass with xlib now pass with xcb (Carl Worth,
  Jamey Sharp).

• Fix some memory leaks in the perf suite (Chris Wilson).

• Fix perf suite to consider changes in pixman/src (Mathias
  Hasselmann).

Build fixes
-----------
• Don't include pre-generated cairo-features.h file. This was causing
  build failures when building with the directfb backend enabled
  (Behdad Esfahbod).

  https://bugs.freedesktop.org/show_bug.cgi?id=10189

• Eliminate use of maintainer mode from cairo's automake/configure
  script. This means that updates to files such as Makefile.am will
  take effect, (by rerunning automake and friends as necessary) when
  invoking make rather than being silently ignored.  (Behdad Esfahbod)

• Don't compile cairo-deflate-stream.c, which depends on zlib, unless
  building the pdf backend which requires it. (Carl Worth, Tor
  Lillqvist)

  https://bugs.freedesktop.org/show_bug.cgi?id=10202

• Don't make the ps backend link against zlib anymore, since it
  doesn't require it (Carl Worth).

• Use "find !" rather than "find -not" for better portability (Thomas
  Klausner).

  https://bugs.freedesktop.org/show_bug.cgi?id=10226

• Don't use unsupported visibility attribute "hidden" on Solaris
  (Gilles Dauphin, Thomas Klausner).

  https://bugs.freedesktop.org/show_bug.cgi?id=10227

Optimization
------------
• It was Behdad that suggested we focus strictly on bug fixes now that
  we shipped so many performance improvements in 1.4.0, but it was
  also Behdad that got distracted by the chance to remove a lot of
  mallocs from cairo. Paths, gstates, trapezoids, splines, polygons,
  and gradient color stops will now use small, stack-allocated buffers
  in the most common cases rather than calling malloc as
  often. (Behdad Esfahbod). And look for more from Mathias Hasselmann
  soon.

Release 1.4.0 (2007-03-06 Carl Worth <cworth@cworth.org>)
=========================================================
The many people[*] who have been working hard on cairo are very
pleased to announce the long-awaited release of cairo 1.4. This
release comes 4 months after the last stable update release (1.2.6)
and 9 months since the initial release of 1.2.0.

The release notes below are intended to capture the highlights of the
changes that have occurred from the 1.2 series to the new 1.4.0
release.

Performance improvements
------------------------
Within the cairo project, the last 6 months or so has seen an intense
effort focusing on the performance of cairo itself. That effort has
paid off considerably, as can be seen in the following highlights of
some of the performance differences from cairo 1.2.6 to cairo 1.4.0.

(Note: The performance results reported here were measured on an x86
laptop. Many of the improvements in 1.4---particular those involving
text rendering---are even more dramatic on embedded platforms without
hardware floating-point units. Such devices played an important part
of many of the optimizations that found their way into cairo over the
last few months.)

• Dramatic improvement when drawing objects that are mostly off-screen
  with the image backend (with the xlib backend this case is still
  slow due to an X server bug):

  image-rgba       long-lines-uncropped-100  479.64 ->  4.98: 96.24x speedup
  ███████████████████████████████████████████████▋

• Dramatic improvement when copying a small fraction of an image
  surface to an xlib surface:

   xlib-rgba              subimage_copy-512    3.93 ->  0.07: 54.52x speedup
  ██████████████████████████▊

• Dramatic improvement to tessellation speed for complex objects:

  image-rgb              tessellate-256-100  874.16 -> 34.79: 25.13x speedup
  ████████████▏
   xlib-rgba        zrusin_another_fill-415  148.40 -> 13.85: 10.72x speedup
  ████▉
   xlib-rgb                  world_map-800  680.20 -> 345.54:  1.97x speedup

• Dramatic improvement to the speed of stroking rectilinear shapes,
  (such as the outline of a rectangle or "box"):

  image-rgb          box-outline-stroke-100    0.18 ->  0.01: 24.22x speedup
  ███████████▋
   xlib-rgb          box-outline-stroke-100    0.46 ->  0.06:  8.05x speedup
  ███▌


• Dramatic improvements to text rendering speeds:

   xlib-rgba       text_image_rgba_over-256   63.12 ->  9.61:  6.57x speedup
  ██▊

• 3x improvements to floating-point to fixed-point conversion speeds:

  image-rgba      pattern_create_radial-16     9.29 ->  3.44:  2.70x speedup

• 2x improvements to linear gradient computation:

  image-rgb     paint_linear_rgb_source-512   26.22 -> 11.61:  2.26x speedup

• 2x improvement to a case common in PDF rendering:

  image-rgb              unaligned_clip-100    0.10 ->  0.06:  1.81x speedup

• 1.3x improvement to rectangle filling speed (note: this improvement
  is new since 1.3.16---previously this test case was a 1.3x slowdown
  compared to 1.2.6):

  image-rgba                 rectangles-512    6.19 ->  4.37:  1.42x speedup
  xlib-rgba                  rectangles-512    7.48 ->  5.58:  1.34x speedup

NOTE: In spite of our best efforts, there are some measurable
performance regressions in 1.4 compared to 1.2. It appears that the
primary problem is the increased overhead of the new tessellator when
drawing many, very simple shapes. The following test cases capture
some of that slowdown:

  image-rgba    m