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Changelog:
GEGL-0.4.30 2021-03-27
----------------------
Build:
~~~~~~
libjpeg and libpng are now required.
Reduce babl requirement to 0.1.78, it is *highly* recommended to build with
a newer babl though despite it being what wants to increase the meson
version requirement. Improved gir build options, fixes for cross compilation.
Large improvements of integration of tests with meson. XML tests are now
outputting in TAP format. As well as many related cleanups of tests that have
been in a state of slight bitrot since the migration to meson.
Upload meson logs as artifcats, use release and debugoptimized build types.
Pin glibc package in arch CI build to a version before it hard depends on linux
4.4.
New Operations:
~~~~~~~~~~~~~~~
negative-darkroom: This operation is for artists who use hybrid workflow
technique of analog photography. After scanning a developed negative, this
operation is used to invert the scan to create a positive image by simulating
the light behaviour of darkroom enlarger and common photographic papers.
Operations:
~~~~~~~~~~~
jpg-load,png-load,tiff-load: show ICC relatd problems as warnings.
rgbe-load : fix handling of exponent=0 in RLE encoded files.
color-reduction : Added blue-noise modes, the patents are expired for some
years already, also added fix to levels parameters; enabling bi-level.
fattal02 : ensure gaussian pyramid has at least one level.
paint-select (in workshop): multi-level banded graphcut, sub-region rather
than full buffer rcomputations and other improvements.
GEGL-0.4.28 2020-12-20
----------------------
Core:
~~~~~
Infrastructure to opt out of listing ops with unmet runtime dependencies.
Build:
~~~~~~
Set vapi metadata better under meson. Make graphviz' dot library is a run-time
not build time dependency.
Operations:
~~~~~~~~~~~
gegl:convert-space and gegl:cast-space operations fixed, and added to build.
icc:load new operation that treats .icc files as images, permitting loading a
space into the graph from file.
Workshop:
~~~~~~~~~
New operation paint-select for an foreground select tool in development.
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Changelog:
GEGL-0.4.26 2020-08-02
----------------------
Core:
~~~~~
Allow unsetting of property keys on paramspecs.
Operations:
~~~~~~~~~~~
perlin-noise: use a local random generator, avoiding resetting the global one.
transform: decrease epsilon for affine-detection, and round some affine matrices to be exact.
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Changelog:
GEGL-0.4.24 2020-06-07
Build:
~~~~~~
CI creation and caching of container images for build. Force support for 64bit
file offsets on win32, re-enabling >2GB tile swap, fallout from migration to
meson. Operations in workshop are now built as a bundle.
Core:
~~~~~
cppcheck liniting fixes. Report pixel-formats as part of graphviz debug. New
meta-data API, that permit handling non-exif metadata in different file loaders
and savers in a generic manner. Use g_ascii_strtod to avoid being tripped up
by ',' expected through locale.
Buffer:
~~~~~~~
Fixed integer overflow in u32 bilinear blit scaler.
Changed cubic interpolation to be a bit softer, reducing induced moire seen in
issue #167. Speeded up cubic sampler with custom inlinable fabsf.
Gracefully fail when running out of swap space. issue #229 Avoid
possible deadlock in file monitoring, working around upstream issue. Reduced
contention on tile allocation. Allow creating buffers with uninitialized data,
and tracking of empty tiles in tile backends. Sleep on tile lock contention,
reducing contention when hyperthreading. Cppcheck liniting fixes.
Operations:
~~~~~~~~~~~
Meta-operations now have an additional vfunc, update(), which gets invoked on
property changes, all meta ops have been refactored to use the new cleaner API.
gegl_operation_meta_watch_node(s) were already effectively nops, they are
marked as deprecated and left as stubs for thid party ops still calling them.
We now provide our own inlined versions of some basic single precision floats
ops, this enables inlining of performance critical code also with lower
optimization levels.
crop: with no parameters set, infer rectangle to crop from graph.
crop: cropping rectangle can be implied from graph.
hue-chroma: avoid modifying hue/chroma of neutrals
dropshadow: added option for shadow growing
median-blur: accept negative radius values
rgb-clip: add parameters for specifying clipping ranges
vignette: new shapes, horizontal and vertical.
imgcmp: make max-diff property conform to gobject standard.
save-pixbuf: use a GObject for consumer read instead of pointer property.
gegl-graph: add a gegl-chain tutorial as default script.
New Ops:
border-align: place a buffer within the borders of another one.
pack: joins two buffers into one, with optional gap.
bloom: adds a glow around highlights.
piecewise-blend: uses a grayscale map as index into array of buffers used as LUT.
variable-blur: uses piecewise-blend piecewise-blend and gaussian blur to approximate blurs with per-pixel blur radius.
focus-blur: a vignetting blur, using variable-blur.
reset-origin: moves upper left of extent to 0,0
band-tune: parametric band equalizer for tuning frequency bands of image.
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recursive bump for the dependency change
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On Darwin, gegl v0.4.22 links against Apple's OpenCL (see gegl/meson.build).
Presumably the hacks in hacks.mk are no longer necessary. In any case,
the package builds and can be used by gimp without it.
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gegl v0.4.22 now uses .dylib as the extension for modules on Darwin.
Consequently, it is no longer necessary to rename the files post-install.
It is, however, necessary to use different extensions for more of PLIST.
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GEGL-0.4.22 2020-02-18
----------------------
Build
~~~~~
Updates to python gobject introspection tests, and made them able to look up
babl typelib.
Build pdf:load again; missing since meson migration.
Fix OpenCL include file generation to work in non-utf8 locales.
Operations
~~~~~~~~~~
matting-{global,levin}: fix crash when bounding boxes of input and aux differ.
Contributors to this release
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Anders Jonsson, band-a-prend, Ell, Félix Piédallu and Øyvind Kolås.
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Darwin uses a different extension (.dylib) than other Unixes (.so) for
shared libraries that applications must link against. However, Gnome
applications expect plugins to use the same extension (.so) on all platforms,
including Darwin. Consequently, on Darwin some shared libraries must be
renamed, both on the filesystem and internally, and others must use the
correct extension in PLIST. This is partially mentioned in PR #54824, but
that missed the need for internal renaming of the libraries. It also
introduced a dependency on the Apple OpenCL framework, which does not seem
to be necessary.
Finally, all the references to Apple-specific OpenCL code must be removed;
previously only some of them were.
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from upstream
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GEGL-0.4.18 2019-10-27
----------------------
Build
~~~~~
Drop autotools, GEGL is now using meson, most things are working again now -
documentation/website build is a work in progress, many issues have been
fixed, more a sure to surface with this first meson only release following the
babl one.
Core
~~~~
Support ui labels and descriptions for aux pads of ops.
Guard against uint32_t overflows in memory computations, improved memory
usage stat on FreeBSD.
Added support for hygon dhyana architecture.
Added gegl_try_malloc and use it to allocate storage for tiles.
gegl-stats gained active- and assigned-threads members.
Buffer
~~~~~~
New API for aligning to regular tile grid, gegl_rectangle_align[_to_buffer]
added gegl_rectangle_xor
gegl_buffer_create_sub_bufer now always returns a new object.
Improved tile compression, more accurate accounting and avoidiance when it is
determinetal.
gegl_buffer_save : store BablSpace
take into consideration concurrent use of different tile sizes in
gegl_tile_alloc
Fast path for gegl_buffer_copy is entirely in abyss.
Improved api misuse handling in gegl_buffer_set|get
Improved consistency of results when doing COW of abyss.
Improved Gobject Intospection annotations.
Use a binary tree for tile swap, improving tile removal speed.
Avoid gegl_buffer_set avoid set_pixel fast path if level>0
Operations
~~~~~~~~~~
Dynamic computation of per-operation thread cost, making GEGL fully use available cores on more operations.
new operations:
bayer-matrix, linear-sinusoid, color-assimilation-grid, normal-map.
new operations in workshop:
boxblur, alpha-inpaint
pass-through for infinite planes for:
apply-lens, polar-coordinates, whirl-pinch, convolution-matrix, maze,
cartoon, waterpixels, tile, distance-transform, spherize, tile-paper, dither,
mantiuk06, reinhard05, fattal02, fractal-trace, motion-blur-zoom,
motion-blur-circular, wind, little-planet, mirrors, cubism and long-shdow.
improved property ranges/meta-data or copyright for:
motion-blur-zoom, edge-neon, cartoon, photocopy, softglow, oilify, bump-map, remap,
convolution:
fix source-buffer offsets of filtered-out components,
avoiding excessive shifting.
jpg-save:
force grayscale if incoming buffer is grayscale
sdl-display:
port to SDL2
gamma:
handle negative input values
apply-lens;
enable auto threading
matting-global:
disable auto threading, allocate less temporay memory.
maze:
reimplemented without recursion
newsprint:
added black pullout and per colorant pattern and period parameters, enable threading.
saturation:
add a colormodel property which permits operating in RGB instead
of CIE Lab, enabling hue preserving saturation changes.
exr-load/exr-save:
only use associated alpha with EXR files
ff-load:
fix audio track decoding for pure audio files
c2g:
fixed initialization data race and out of bounds array access when threaded.
color-enhance:
fixed a buffer leak
perlin-noise:
fix initialization race
domain-transform:
faster nop for edge-preservation=1.0, support BablSpace
oilify:
support specifying mask-radius with aux buffer
linear-gradient, readial-gradient:
use colors in correct order.
pixelize:
avoid potential glitches
weighted-blend:
harmonize opencl implementation with C
edge-neon:
performane improvements
GEGL UI
~~~~~~~
gcut video editor ui has been removed, all its functionality is latent in
the new media browser/manipulator/viewer UI.
Permit start/end times for playlist items, enabling use of folder as EDL.
Add ability loop currently shown media element.
Nearest neighbor decoding; for realtime playback of HD video content.
Frame-cache for rendered video frames (with associated PCM data)
Drag and drop from file-managers to collection view.
Contributors to this release:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Abderrahim Kitouni, Alexandre Prokoudine, Asier Sarasua Garmendia, Bruce
Cowan, Debarshi Ray, Dimitris Spingos, Ell, fanjinke, Félix Piédallu,
Jan Vesely, Jordi Mas, Marco Ciampa, Martin Srebotnjak, Michael Natterer,
Michael Schumacher, Niels De Graef, Øyvind Kolås, Pawan Chitrakar,
Piotr Drąg, Rodrigo Lledó, Sabri Ünal, Schwan Carl, Shlomi Fish, Stefan Brüns,
Thomas Manni and Ting-Wei Lan.
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Re-enable it with the 'jasper' option.
Part of the process of trying to minimize the potential impact of a
vulnerable jasper.
Bump PKGREVISION
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Changelog:
GEGL-0.4.16
Not available
GEGL-0.4.15
Build
Added gitlab continuous integration.
Core
Platform specific build fixes for both win32 and OSX.
Avoid in-place processing for cached nodes.
Indentation consitency improvements.
Permit more detailed specifying/overriding of OpenCL device through the
GEGL_USE_OPENCL environment variable.
New call gegl_update_anim_time for applying the animation curves of
properties.
Buffer
Swapped behavior of cubic interpolation from cubic to mithcell
coefficients, leading to crisper results in all uses of the cubic
sampler.
Permit tiles to be unreffed after GEGL shut-down without crash, which
is likely when using bindings to dynamic languages.
Use malloc_trim when compiled with glibc to possibly decrease the
resident size of progress when buffers are destroyed.
Improved deadlock prevention in gegl_buffer_copy() when using copy on
write.
Operations
Use indirect buffer inputs on main thread during multi-processed
processing for point-filters/composers and tranform base classes.
Smaller required/invalided ROI for map-absolute/relative when using
nearest neighbor.
tiff-save and jpg-save fixed dimensions when buffer saved has non-zero
origin
Added missing descriptions of properties for cubism, mosaic,
tile-paper, color, mantiuk06 and vignette operations.
ff-load fix some of the deprecation warnings.
ff-save avoid crashing if audio or video codec fails to initialize.
cache, parent class changed - it is no longer a point operations, also
speed up processing and permit copy on write handling of tiles.
opacity and invert - crash for 8bpc buffers, reimplemented logic for
(non-)associated alpha OpenCL kernel selection.
Tools
Drop direct dependency on exiv2 - we now only transiently depend on it
through the gexiv2 abstraction.
commandline tool/gui
Store per image editing chains in .gegl folder instead of sidecars.
Set window title, permit interaction with opened .lui documents, fixed
playback of audio for opened videos - it now works; if the video is
decoding, scaling and display is fast enough to leave spare cycles.
Support for nearest neighbor scaling of imagry; aiding video playback
without dropping audio frames.
Support for custom collection order and per-file key-value metadata.
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Changelog:
GEGL-0.4.14 2019-03-xx
Core
New Scratch allocator for short lived buffers.
Removed unneeded buffer copies in some processing code paths in
GeglNode and GeglProcessor.
Add gegl_babl_variant API for getting variations on an existin
pixel-format/encoding.
Expose gegl_node_is_graph()
GeglBuffer
Compression of tile data.
Handle dynamically changing swap dir.
Improvements to mipmap damage propagation.
Fixes to threading race conditions.
Low-level tile handling more adapted to buffers creating from existing
linear data.
New iterator API is now the default, GEGL_BUFFER_ITERATOR2_API is no
longer needed.
CMYK/grayscale handling for scaled blits, code paths in samplers,
serialization.
New default tile-cache size, 50% of RAM.
Initialize the first OpenCL device with IMAGE support.
Added gegl_parallell_ from gimp_parallell_ API to distribute processing
for multiple cores.
Operations
crop, added aux-pad - if connected the incoming bounding box determines
the crop size.
Input-format specific processing for performance in watershed-transform
and invert ops. CMYK handling in jpg-load/save, tiff-load/save,
gaussian-blur, opacity, most composing and blending operations, text,
vector-stroke, path, and transform operations.
Improved or fixed mipmap preview rendering of emboss, linear-gradient
and radial-gradient.
Better ui strings/range/defaults for: distort/waves and dropshadow,
value-propagate.
gaussian-blur: fix mistake in implementation of IIR Young blur 1d,
which caused non circular halos.
New operation: pdf-load with build dependency on poppler-glib
Added offset properties to pixelize filter.
new ops in workshop: voroni diagram, Grey Color Removal, spyrograph.
Handle mipmap rendering for linear-gradient and radial-gradient.
UI
The existing microraptor-gui (immediate mode touch UI+CSS with cairo)
image viewer that can be built as part of the gegl binary has been
revisted, a graph/property editor has been added, and migration/
extension to lua has begun for parts of the code.
many parts of the UI is of exploratory proof of concept/alpha
Warning quality but released since it is part of the GEGL repository
and useful development tools both for creating and testing new
GEGL operations as well as GEGL itself.
Some screenshots showing some the process towards the state and
capabilties of the UI in this release can be seen at https://
www.patreon.com/posts/24123574
To build with this UI the following dependencies also need to be
satisifed, for now this is not intended to be packaged by distributions
yet.
libluajit-dev
lua-lgi (debian package name) upstream:
mmm https://github.com/hodefoting/mmm
mrg https://github.com/hodefoting/mrg
Features: folder view resolution independent UI touch oriented
navigation GIF / video playback PDF pagination goats that expose
performance and capabilty issues in GEGL efficient (though not
sandboxed) thumbnailing embedded simple commandline graph editor
zoomable automatic, consistent graph layout autogenerated
property-inspector ui visualization of color model/bitdepth through
styling of edges live-extendable with lua code for per-operation canvas
UI
Contributors to this release:
Alan Mortensen, Alexandre Prokoudine, Anders Jonsson, Andre Klapper,
Debarshi Ray, elad, Ell, Jehan, Marco Ciampa, Michael Natterer, Øyvind
Kolås, Piotr Drąg, Richard B. Kreckel, Rodrigo Lledó, sabri ünal,
thetoastcaper, Thomas Manni and woob.
This release depends on the new features of babl-0.1.62 which has the
following change summary for the last release:
Continuous integration with gitlab. Initial CMYK spaces with lcms2
based ICC support, much room for optimization. Improved custom space
support for palette formats. scRGB space, works like sRGB but always
with linear TRCs. Model introspection API permitting low overhead
checks whether a format/model is RGB, CMYK type of alpha and similar.
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Changelog:
GEGL-0.4.12 2018-10-23
GeglBuffer
~~~~~~~~~~
Fix fix of scaled blitting, the fix from last release introduced scaling
artifacts for all formats that are non-8bit.
Contributions to this relase
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Ell, Øyvind Kolås and Rodrigo Lledó
GEGL-0.4.10 2018-10-16
----------------------
GeglBuffer
~~~~~~~~~~
Fix integer overflow issues for u32 blit scaling code paths.
Reduced memory clearing overhead for temporary buffers during blit.
Round alpha component during u8 bilinear/box filtering (this caused artifacts
on OSX through interaction without unknown platform differences in
libc/compilter/graphics stack)
gegl_buffer_dup now matches source buffer abyss, shift and tile-size more
closely.
Added GEGL_TILE_COPY command for backends, for more efficient buffer
duplication/copies.
New GeglBufferIterator API.
Move type-generic scaling algorithms to GeglBuffer folder, move opencl
integration bits out of buffer.
Operations
~~~~~~~~~~
gif-load: new operation for decoding GIF images/animations, with frame delay
exposed as an out-property.
exr-save: do not hard-code a version name space
long-shadow: add 'Fading (fixed length)' style with a new user-defined
'Midpoint' parameter
maniuk06: use double precision, permitting to work on larger images.
watershed-transform: improved description
unsharp-mask: permit std-dev radius of up to 1500px (from 300).
Updated all operations to use new iterator API
Contributors to this release
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Alexandre Prokoudine, Anders Jonsson, Debarshi Ray, Ell, Hussam Al-Tayeb, Marco
Ciampa, Massimo Valentini, Øyvind Kolås, Piotr Drąg, Rodrigo Lledó and Tim
Sabsch.
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Changelog:
GEGL-0.4.8 2018-08-17
---------------------
Core/GeglBuffer
~~~~~~~~~~~~~~~
Fixes to races during buffer/tile storage destruction, improve swap usage for
stored empty tiles.
Operations
~~~~~~~~~~
motion-blur-circular - improve/clarify property ui
median-blur - added abyss-policy property
long-shadow - new operation
little-planet - adapt reference composition
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* Fix gcut conflict, PR pkg/53236
Changelog:
GEGL-0.4.4 2018-06-02
Core
Point filters with need for format conversion of input are now
parallel. Added swap-reading, swap-writing, swap-read-total and
swap-write-total properties to GeglStats.
Buffer
Trim tile-cache when shrinking. Add reading locks to tiles further
improving concurrent access tolerance of GeglBuffer.
Operations
threshold: operating format changed from linear to perceptual
unsharp-mask: add rename standard-deviation and scale properties to
Radius and Amount, add Threshold property. recursive-transform now
supports applying multiple transformations simultanously. Fix integer
overflow due to logic error in pixelize. new operation: gegl:abs which
negates negative values. new operation in workshop:
selective-hye-saturation.
Contributors
Alan Mortensen, Alexandre Prokoudine, Daniel Korostil, Debarshi Ray,
Dimitris Spingos (Δημήτρης Σπίγγος), Ell, Marco Ciampa, Michael
Schumacher, Miroslav Talasek, orbea, Øyvind Kolås, Øyvind "pippin"
Kolås, Piotr Drąg, Rūdolfs Mazurs, and Tobias.
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GEGL-0.4.2 2018-05-15
Build
Abort early if autoreconf fails, remove unused bits, default to -Ofast
as CFLAGS.
GeglBuffer
Improve concurrency for trimming and destruction of tile caches.
Improve cache invalidation during partial mipmap regeneration.
Do new cheap clones of buffers with new internal gegl-buffer backed
tile-backend.
Do not keep cached sampler in buffer it makes cache invalidation hard,
and for performance/threading it is better to create ones own samplers
anyways. The old API still exists, though parts of it is now
deprecated. The single special case where gegl_buffer_sample remains
somewhat performant is with the NEAREST sampler, for all other samplers
creating a caching sampler is better.
Operations
operation: add GeglOperationAreaFilter::get_abyss_policy() vfunc
Copyright notice improvements to spherize, color-overlay. ff-save:
implement defines handling compilation with ffmpeg 2.3-2.7, 4.0 compat.
Improved multi-threaded performance of panorama-projection and other
transformation operations through optimizations in buffer and
base-classes.
Contributors
code improvements and translations from: Daniel Korostil, Debarshi Ray,
Dimitris Spingos (Δημήτρης Σπίγγος), Ell, Franz Brausse, Jehan, Jordi
Mas, Marco Ciampa, Øyvind Kolås, and Sebastian Pipping.
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Changelog:
GEGL-0.4.0 2018-04-26
GEGL 0.4.x is a stable release series of GEGL to have a stable API
and ABI to go with GIMP-2.10. When the need arises to break API or
ABI compatibility the 0.4.x series will get its own branch and
unstable API experiments and development, 0.5.x will happen in
master. For now though master will track the 0.4.x series. Core
Change GeglParamSpecSeed from int to uint to match the value range
of GeglRandom's seed. Operations
ripple fixed remaining issues needed to remove legacy GIMP plug-in
in GIMP. spherize, requrise transform and color-overlay moved out
of workshop. ppm-load ported to GIO.
Contributors to this release: Ell, Piotr Drąg, Anders Mortensen,
Anders Jonsson, Marco Ciampa, Daniel Korostil, Øyvind Kolås, Jon
Nordby and Simon Budig.
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⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺
• build: do not install examples in path
• ff-save fully store all in-flight codec contexts before closing files
• ff-load improvements to seeking accuracy
• transform: make fast paths skip pixel format conversions
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Problems found with existing digests:
Package fotoxx distfile fotoxx-14.03.1.tar.gz
ac2033f87de2c23941261f7c50160cddf872c110 [recorded]
118e98a8cc0414676b3c4d37b8df407c28a1407c [calculated]
Package ploticus-examples distfile ploticus-2.00/plnode200.tar.gz
34274a03d0c41fae5690633663e3d4114b9d7a6d [recorded]
da39a3ee5e6b4b0d3255bfef95601890afd80709 [calculated]
Problems found locating distfiles:
Package AfterShotPro: missing distfile AfterShotPro-1.1.0.30/AfterShotPro_i386.deb
Package pgraf: missing distfile pgraf-20010131.tar.gz
Package qvplay: missing distfile qvplay-0.95.tar.gz
Otherwise, existing SHA1 digests verified and found to be the same on
the machine holding the existing distfiles (morden). All existing
SHA1 digests retained for now as an audit trail.
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Header location and library names changed, so bump API version.
No users in pkgsrc (yet).
Changes in GEGL 0.3.0
---------------------
• Improvements to thread safety and parallelism.
• Lower overhead graph travesal due from rewrite of visitors
• OpenCL support now enabled by default when detected.
• Experimental multithreading, enable by setting
GEGL_THREADS=<number of threads> in the environment.
• Experimental mipmap rendering, which permits transparent rendering of
previews on smaller sized versions, enable by setting
GEGL_MIPMAP_RENDERING=true in the environment.
• Operations:
• new operations: alien-map, antialias, apply-lens, bilateral-filter,
bump.map, cartoon, channel-mixer, color-enhance, color-exchange,
color-reduction, color-rotate, convolution-matrix, copy-buffer, cubism,
deinterlace, diffraction-patterns, distance-transform, displace, edge,
emboss, engrave, exposure, fractal-trace, high-pass, image-compare,
illusion, invert-gamma, lens-flare, linear, linear-gradient, mosaic,
motion-blur-circular, motion-blur-zoom, noise-cell noise-cie-lch,
noise-hsv, noise-hurl, noise-pick, noise-rgb, noise-simplex, noise-spread,
n-point deformation ops, oilify, panorama-projection, photocopy, plasma,
radial-gradient, red-eye-removal, scale-size-keep-aspect, softglow,
stretch-contrast, texturize-canvas, tile-glass, tile-seamless, tile-paper,
tile, warp, whirl-pinch, wind, cache, cast-format, lcms-from-profile,
npy-save, webp-load, webp-save, scale-ratio, scale-size, seamless-clone,
sinus, supernova, value-propagate, video-degradation
• reimplementation of gaussian-blur faster and more accurate
• support for using URIs in image loaders
• Buffer:
• New default tile backend, doing disk writes in a separate thread.
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GEGL tries to use OpenCL in a really weird way. It has (and installs!)
a local copy of OpenCL headers and then tries to find implementation
by dlopen'ing "libOpenCL.so". The problem is that it fails to compile
on Darwin < 10 by trying to include non-existent native OpenCL headers
too, which is in fact only optional.
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