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

Bryce Harrington bryce at bryceharrington.org
Sat Jun 2 03:42:51 UTC 2018


On Wed, Apr 11, 2018 at 10:48:27PM -0700, Bryce Harrington wrote:
> 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
> 
> On Wed, Apr 11, 2018 at 07:56:12PM -0700, Bryce Harrington wrote:
> > A new cairo snapshot 1.15.12 is now available from:
> > 
> >   http://cairographics.org/snapshots/cairo-1.15.12.tar.xz
> > 
> >     which can be verified with:
> > 
> >     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)
> > 
> >   Additionally, a git clone of the source tree:
> > 
> >   git clone git://git.cairographics.org/git/cairo
> > 
> >     will include a signed 1.15.12 tag which points to a commit named:
> >     7149686456ec3c481fa1d3dbe76a0dab1e42b519
> > 
> >     which can be verified with:
> >     git verify-tag 1.15.12
> > 
> >     and can be checked out with a command such as:
> >     git checkout -b build 1.15.12
> > 
> > 
> > Release 1.15.12    (2018-04-04 Bryce Harrington <bryce at osg.samsung.com>)
> > ========================================================================
> > 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 B├ęzier 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
> > -----------------------------------------
> > The primary source of information about cairo is:
> > 
> > 	http://cairographics.org/
> > 
> > The latest versions of cairo can always be found at:
> > 
> > 	http://cairographics.org/download
> > 
> > Documentation on using cairo and frequently-asked questions:
> > 
> > 	http://cairographics.org/documentation
> > 	http://cairographics.org/FAQ
> > 
> > Mailing lists for contacting cairo users and developers:
> > 
> > 	http://cairographics.org/lists
> > 
> > Roadmap and unscheduled things to do, (please feel free to help out):
> > 
> > 	http://cairographics.org/roadmap
> > 	http://cairographics.org/todo
> > 
> > 
> > 
> > Changes since 1.15.10
> > ---------------------
> > 
> > Adrian Johnson (1):
> >       ps: fix compile warning
> > 
> > Antonio Ospite (1):
> >       svg: fix compilation with MSVC which doesn't support C99 initializers
> > 
> > Behdad Esfahbod (13):
> >       [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
> > 
> > Bryce Harrington (18):
> >       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
> > 
> > Eric Hoffman (1):
> >       win32: Fix multi-monitor virtual desktop with negative monitor coords
> > 
> > Federico Mena Quintero (2):
> >       Add .gitlab-ci.yml to run the tests automatically
> >       bfo#105084 - Initialize memory properly in _cairo_ft_font_face_create_for_pattern()
> > 
> > Massimo (1):
> >       bfo#91271 - Fix access of uninitialized memory
> > 
> > Matthias Clasen (21):
> >       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
> > 
> > Uli Schlachter (7):
> >       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
> > 
> > Unknown (1):
> >       Cairo trivial typos
> > 
> > suzuki toshiya (1):
> >       csi-trace does not show help
> > 
> > 
> 
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> 
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> 
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