[cairo] Planning for Cairo 1.16.0 (was Re: cairo snapshot 1.15.12 now available)

[Bryce Harrington]

Federico has some additional patches for improving the testsuite that
I've been looking at, but I think they need a bit more time to study so
opted to finish up this release first. I'll plan on another snapshot in
a month or two.

In looking at the aforementioned rendering patches, it's clear the
reference images have dependance on behavior of codebases external to
Cairo. I.e., same version of Cairo can give different renderings when
using old vs. new libpixman, font libraries, maybe more.

I think the simplest solution would be to designate a reference distro
image to baseline. We could then regen the reference images against
that specific image (at least, the ones that are clearly just fuzz, not
legitimate errors). Going forward, we would then use test runs on that
particular platform as "truth". Hopefully this approach would also
assist us in pinpointing where the variances are originating from,
and/or how to better control for that.

I've started working on this, but it'll take some time to manually
review the rendering discrepancies. I'm hoping to be done within the
next couple weeks, though.


When that is done, I'll do one more snapshot release, 1.15.14. I'm
going to make an effort to review and land patches in the meantime; if
there's anything I should give priority attention to, please feel free
to flag it for me.

Unless there's any major issues found with 1.15.14, I'd like to then do
1.16.0 pretty directly. We can think of 1.15.14 as effectively a beta
for that. I've been wanting to land a couple feature efforts I've got
under way before 1.16, but since those will be adding new APIs it's
probably wisest to land them at the start of a new development series in
case the APIs need refinement.


If anyone has concerns/comments about the above plan, please let me know.

Bryce

Bryce

http://cairographics.org/snapshots/cairo-1.15.12.tar.xz
http://cairographics.org/snapshots/cairo-1.15.12.tar.xz.sha1
4e64c6a48789edb4c60bc3fa95bd3992cc388b88 cairo-1.15.12.tar.xz
http://cairographics.org/snapshots/cairo-1.15.12.tar.xz.sha1.asc
(signed by Bryce Harrington)
git clone git://git.cairographics.org/git/cairo
7149686456ec3c481fa1d3dbe76a0dab1e42b519
git verify-tag 1.15.12
git checkout -b build 1.15.12
========================================================================
The main focus for this release is the addition of Variable Font
support. Variable fonts are single font files with various typography
characteristics, such as weight or slant, that users of the font can
adjust between two points. Effectively this enables a single font to
behave as multiple fonts.
The Skia backend is disabled in this release, due to severe bitrot, and
will be removed in future releases. Contact the cairo team if you have
a need of this backend.
For a complete log of changes, please see
http://cairographics.org/releases/ChangeLog.1.15.12
Features and Enhancements
-------------------------
* Variable font support
* Skia backend is disabled
API Changes
-----------
* cairo_font_options_get_variations() and
cairo_font_options_set_variations() are added.
Dependency Changes
------------------
None
Performance Optimizations
-------------------------
None
Bug Fixes
---------
* Fix errors in csi-trace --help and --version options
* Fix a 'memory leak' in the image compositor, with
pixman_glyph_cache_t.
* Fix access of uninitialized memory found by valgrind
(Bug #91271)
* Fix improper initialization of memory in
_cairo_ft_font_face_create_for_pattern()
(Bug #105084)
* Fix multi-monitor virtual desktop with negative coords on Win32
(Bug #100793)
* Fix issues occuring with older FreeType versions.
What is cairo
-------------
Cairo is a 2D graphics library with support for multiple output
devices. Currently supported output targets include the X Window
System (via both Xlib and XCB), quartz, win32, and image buffers,
as well as PDF, PostScript, and SVG file output. Experimental backends
include OpenGL, BeOS, OS/2, and DirectFB.
Cairo is designed to produce consistent output on all output media
while taking advantage of display hardware acceleration when available
(for example, through the X Render Extension).
The cairo API provides operations similar to the drawing operators of
PostScript and PDF. Operations in cairo include stroking and filling
cubic Bézier splines, transforming and compositing translucent images,
and antialiased text rendering. All drawing operations can be
transformed by any affine transformation (scale, rotation, shear,
etc.).
Cairo has been designed to let you draw anything you want in a modern
2D graphical user interface. At the same time, the cairo API has been
designed to be as fun and easy to learn as possible. If you're not
having fun while programming with cairo, then we have failed
somewhere---let us know and we'll try to fix it next time around.
Cairo is free software and is available to be redistributed and/or
modified under the terms of either the GNU Lesser General Public
License (LGPL) version 2.1 or the Mozilla Public License (MPL) version
1.1.
Where to get more information about cairo
-----------------------------------------
http://cairographics.org/
http://cairographics.org/download
http://cairographics.org/documentation
http://cairographics.org/FAQ
http://cairographics.org/lists
http://cairographics.org/roadmap
http://cairographics.org/todo
Changes since 1.15.10
---------------------
ps: fix compile warning
svg: fix compilation with MSVC which doesn't support C99 initializers
[variations] Towards fixing test
[variations] Fix test
[variations] Merge variations in cairo-ft font option merging
[varfonts] Use blend, not design, coordinates to check for non-base variation
[varfonts] Correctly (re)set variations of named instances
[ft] Use variations from ft_options, not scaled-font
[ft] When merging font options, order variations correctly
[ft] Fix warnings
[ft] Remember variations set on FT_Face and apply them
Merge branch 'font-variations'
Use FT_Done_MM_Var() if available
Fix compile with older FreeType without FT_Get_Var_Design_Coordinates
Fixup on previous commit
1.15.10 release
1.15.10 release
Bump version for new development tree, 1.15.9
svg: Label for cairo_svg_unit_t doxygen was incorrect
makefile: Fix sorting of source files
test: Fix compile with older FreeType without FT_Get_Var_Design_Coordinates
RELEASING: Refine devel version and tagging
Fix two type casting warnings in get_C_locale()
font: Check return value from _cairo_ft_unscaled_font_lock_face
xml: Typo in comment
win32: Whitespace cleanup
win32: Fix a few typos in comments
compiler-private: Define what PLT stands for
cairo-version: Fix version references in docs
Disable skia from configure
configure: Conditionalize color font feature for older freetype2
1.15.12 release
Bump version for new development tree, 1.15.13
win32: Fix multi-monitor virtual desktop with negative monitor coords
Add .gitlab-ci.yml to run the tests automatically
bfo#105084 - Initialize memory properly in _cairo_ft_font_face_create_for_pattern()
bfo#91271 - Fix access of uninitialized memory
Fix a logic error in color glyph compositing
Make _intern_string_hash safe for ""
Make _intern_string_hash non-static
Add font variations to font options
Load font variations from fontconfig too
Use strtod_l when available
Apply font variations when loading fonts
Add a test for font variations
Work around a freetype bug
Make the font-variations test pass
Apply font variation options consistently
Always save the origin face index
Trivial: code movement
Apply font variations when loading glyphs
fixup: remove a hack
fixup
Shortcut FT_Set_Var_Design_Coordinates
Fix a memory leak
Don't leak patterns when compositing color glyphs
Add a _cairo_font_options_fini function
Don't leak memory in font options
Revert "fix warning: variable X might be clobbered by 'longjmp'"
Add test for error handling with broken PNG streams
Fix warning: '*' in boolean context
fix warning: variable X might be clobbered by 'longjmp'
Fix a 'memory leak' in the image compositor
Skip font-variations test for missing fonts
pthread-same-source: Refresh reference images
Cairo trivial typos
csi-trace does not show help
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