GEGL-0.4.6 2018-07-23
---------------------

Up until now GEGL has been using a color space corresponding to scRGB as an
unbounded device independent/possibly scene-referred HDR color space - with a
similar approach to to how ACEScg works but with a worse set of RGB primaries.
babl formats, represented by a pointer and a corresponding encoding/format
string have been used to specify the specific encoding of pixel values. The
encoding including component order, data type and TRC encoding.  Where "RGBA
float" means 32bit float data and "R'G'B' u8" the ' indicates non-linear, and
thus this is sRGB.  "RaGaBaA half" gives premultiplied linear half data. Other
encodings and conversions are also provided through these formats including
"CIE Lab float" and "HSV float".

As a color management workflow for scene-referred imaging the above could be
sufficient, but GIMP needs data in the 0.0-1.0 range for some display referred
blending modes to work properly. As a consequence of this recognized
short-coming GIMP has been passing the pixels of for instance ProPhoto "R'G'B'A
float" off as "R'G'B'A float" and linear ProPhoto "RGBA float" as "RGBA float"
this works for single operations, but falls apart when the colors are converted
to CIE Lab. This is the good enough state where the other benefits of having a
stable release powered by GEGL outweighed not being entirely correct.

Since babl 0.1.32 of october 2017, all babl formats have an associated
unchangable space associated with them, and since then GeglBuffer has worked
correctly with it - since GeglBuffers use of babl API did not change.  GIMP is
already using these parts of babl for ICC matrix based conversions since using
babl for ICC profile transforms is an order of magnitude faster than using the
lcms2 library.  It took time to come up with the above scheme of integrating
arbitrary primaries and curves for spaces with babl in a maintainable manner,
and it has taken until the last month to come up with a full plan for the rest
of GEGL to be aware of and handling arbirary parametric ICC v2/v4 based color
spaces for operations; without limiting the ability to extend and use the code
for a wide range of scenarios.

A space can be constructed from a preferenced name/specification, loaded/saved
from ICC matrix profiles or constructed and serialized to whitepoint + rgb
chromaticities / xyz matrix. More recently an additional trc mark has been
added '~', giving this vocabulary for RGB formats, in addition to variants with
alpha and pre-multiplied alpha variants of the same:

 "RGB"     linear      primaries from space, linear data
 "R'G'B'"  non-linear  primaries from space, TRCs from space
 "R~G~B~"  perceptual  primaries from space, sRGB TRC

When creating device independent CIE based spaces they also get passed a space,
this means that we can convert CIE Lab to RGB float, keeping track of which
space / ICC profile the data correspond to.

GEGL operations now construct their desired encodings of formats by taking the
space of buffers on input pads into account. By default, for composers "input"
wins over "aux" to determine ops space. If an operation is not ported, data
will be converted to sRGB on input and sRGB will come out of the node.

Buffer loaders PNG, JPG, TIFF and EXR generate custom spaces based on ICC
profiles/primaries. The corresponding savers saves color space information.
A new save handler for the .icc extension, acts like an image storer but
only saves the ICC profile of the buffer it gets on input.

With no additional operations inserted, this now means that GEGL graphs operate
on linear / non-linear variants of the color space used in the input images
without conversion. The new operations gegl:cast-space and gegl:convert-space
provide means of overriding this behavior, see the new section about color
management in the gegl-chain syntax documentation at
http://gegl.org/gegl-chain.html

Initial work has started on making GIMP also use of and propagate color space
information along with encoding in babl formats, changes which also will be
integrated in the 2.10 branch.

Other changes to operations:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

vignette: fixes to gamma property

New operations:

  cast-space: assign/override color space
  convert-space: convert to a different color space
  litte-planet: stereographic-mapping split out of the panorama-projection

New operation in workshop:

  acrs-rrt: ACES RRT based HDR to SDR proof/preview point-filter tonemapping op.

Contributors to this release:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Alan Mortensen, Daniel Korostil, Daniel Mustieles, Ell, Francisco Mariano-Neto,
Marco Ciampa, Matej Urbančič, Michael Natterer, Michael Schumacher, Øyvind
Kolås, Piotr Drąg, Rodrigo and Snehalata B Shirude.


GEGL-0.4.4 2018-07-04
---------------------

Core
~~~~

Added swap-reading, swap-writing, swap-read-total and swap-write-total
properties to GeglStats.

Buffer
~~~~~~

Trim tile-cache when shrinking.
Added reading locks to tiles further improving concurrent access tolerance of
GeglBuffer.

Operations
~~~~~~~~~~

Point filters with need for format conversion of input are now parallel.

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.
Fixed integer overflow due to logic error in pixelize.
New operation: gegl:abs which negates negative values.
New operation in workshop: selective-hue-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.



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.


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.


GEGL-0.3.32 2018-04-16
----------------------

Core
~~~~

Change GeglParamSpecSeed from int to uint to match the value range of
GeglRandom's seed.

Operations
~~~~~~~~~~

Limit allocations in ppm-load to 2GB CVE-2018-10114

Contributors to this release: Piotr Drąg, Øyvind Kolås, Sebastian Rasmussen and
Michael Natterer.

GEGL-0.3.32 2018-04-13
----------------------

Operations
~~~~~~~~~~

panorama-projection: added reverse transform, which permits using GIMP for
retouching zenith, nadir or other arbitrary gaze directions in equirectangular,
also known as 360x180 panoramas.

Added abyss-policy to base class for scale ops, making it possible to achieve
hard edges on rescaled buffers.

GeglBuffer
~~~~~~~~~~

Improved performance and correctness, avoid incorrectly gamma/ungamma
correcting alpha in u8 formats, for a tiny 2-3% performance boost.

Keep track of valid/invalid areas on smaller granularity than tiles in mipmap.

Various micro-optimizations in display paths, with minuscle performance impact.


Contributors to this release: Alexandre Prokoudine, Ell, Jehan, Marco Ciampa,
Michael Natterer, Øyvind Kolås and Piotr Drąg.

GEGL-0.3.30 2018-03-19
----------------------

GeglBuffer:
~~~~~~~~~~~

gegl_buffer_get now treats the final argument, which used to control only abyss
behavior as a bit-field that also can have interpolation method to use when
scaling down from the next larger mipmap level, valid values are
GEGL_BUFFER_FILTER_NEAREST, GEGL_BUFFER_FILTER_BILINEAR,
GEGL_BUFFER_FILTER_BOXFILTER and GEGL_BUFFER_FILTER_AUTO.

All scaling is now done on linear data, making future results of mipmap
computations more valid as well as providing correct results for scaled down
thumbnails in user interfaces. Optimized code paths have been added for 8bit
buffers (using 12bit linear as processing space) and other formats like 16bit
float are now correctly handled by going through generic code paths.

The scaling code paths has also been instrumented and optimized for
performance. Improvements to pixel data fetching and setting functions leads to
performance boosts across many GEGL operations, as well as display code paths
in GEGL using applications. For some performance critical display cases
performance should have improved 2-3x over last release.

Improvements to logic switching to boxfiltering behavior and improve cubic
samplers box filtering by using a linear sampler and a nearest sampler for the
boxfiltering for the linear sampler. This slows down scaling down with the
cubic sampler by half, but is less prone to aliasing, while keeping the faster
code paths for the fast but not as bad as nearest - bilinear.

gegl_buffer_copy gegl_buffer_clear and gegl_buffer_set color now only
emit a single changed signal on the buffer.

Operations:
~~~~~~~~~~~

c2g and stress have gained the ability to toggle the influence of the shadow
neighborhood or not, the new default is to not improve shadow detail; yielding
a bit more natural renditions.

color-to-alpha now contains improvements from experiment in workshop which is
gone.

Fixed crahses in median-blur.

Transform ops:
~~~~~~~~~~~~~~

Only rasterize inside the transformed polygon, saving cpu. The optimizations
mentioned for GeglBuffer giving boosts and improved quality.

New ops:
~~~~~~~~

Mean-curvature blur.

News ops in workshop:

color-overlay, enlarge, inpaint, domain-transform, recursive=transform.

Contributors for this release were: Alan Mortensen, Alexandre Prokoudine,
Debarshi Ray, Dimitris Spingos, Ell, Felipeek, Inaki Larranaga Murgoitio,
Jehan, Jordi Mas, Mario Blättermann, Michael Natterer, Øyvind Kolås, Piotr
Drąg, Rūdolfs Mazurs, and Thomas Manni.


GEGL-0.3.28 2018-01-23
----------------------

Core
~~~~

A new GeglStats object, which provides realtime statistics/profiling for use
in UIs.  Automatically copy-on-write clone input buffers for auto-threading of
operations.

Buffer
~~~~~~

Many significant optimizations as well as a correctness improvement, mipmap
scaling and rendering is now done correctly in linear space, thus GIMP will not
only produce the right results but also avoid gamma errors in thumbnails and
viewport.

Among the signifcant performance boosters are per buffer-instance tile queues,
adaptive sampler pre-fetch caching and dedicated code paths for fetching
columns of pixels. Along with many multi-threadedness improvements due to more
significant testing.

Operations
~~~~~~~~~~

Mipmap tuning and performance improvements to gaussian blur
added dedicated code paths for nearest sampler in transform ops.
more generic RGBE file handling
ff-load: permit decoding audio files as well as video files.
various code cleanups


GEGL-0.3.28 2018-01-23
----------------------

Core
~~~~

A new GeglStats object, which provides realtime statistics/profiling for use
in UIs.  Automatically copy-on-write clone input buffers for auto-threading of
operations.

Buffer
~~~~~~

Many significant optimizations as well as a correctness improvement,
mipmap scaling and rendering is now done correctly in linear space,
thus GIMP will not only produce the right results but also avoid gamma
errors in thumbnails and viewport.

Among the signifcant performance boosters are per buffer-instance tile queues,
adaptive sampler pre-fetch caching and dedicated code paths for fetching
columns of pixels. Along with many multi-threadedness improvements due to
more significant testing.

Operations
~~~~~~~~~~

Mipmap tuning and performance improvements to gaussian blur
added dedicated code paths for nearest sampler in transform ops.
more generic RGBE file handling
ff-load: permit decoding audio files as well as video files.
various code cleanups



GEGL-0.3.26 2017-12-14
----------------------

Core
~~~~

Make gegl-chain parser more robust wrt parsing babl formats, and improved -
translatable - error handling.

Add capabilitity to use per thread input buffers for multi-threaded
filter/composer/composer3 ops, this reduces contention over the buffer tile
locks and improves multi-threaded performance in some cases without reducing it
for the majority of cases.

Buffer
~~~~~~

Threads no longer blocked while locking tiles, and fixes to gegL_buffer_copy.
Better clone accounting in tile cache.

Operations
~~~~~~~~~~

  exp-combine: code cleanup/simplification
  libraw: make bounding box handling consistent with rest of code.
  transform ops: re-enabled multi-threading, reduced some format
                 conversions and added wiggle-room in required/invalidated
                 calculations.

GEGL-0.3.24 2017-11-24
----------------------

Core
~~~~

Flush opencl side buffers before multi threaded iteration for point ops, making
multi threading + opencl work.

Add meta-op graph case to gegl_operation_get_source_node

Versioning of installed .mo files restored.

Enable multi-threaded processes by default.

Stop enabling opencl by default, performance with beignet is worse than
multi-threading, and with nvidia blank results are being observed in GIMP;
maybe improved opencl kernels would make it competetive with multi threaded
cpu?

Deprecate gegl_operation_context_get_source, replace usage with
gegl_operation_context_get_object.

Buffer
~~~~~~

More multi-thread proofing.

Operations
~~~~~~~~~~

median-blur: now op coming out of the GEGL workshop.

exposure: increase old lingering constant enabling larger range of valid inputs.

transform: turn off multi-threading, it was currently degrading overall
performance.

ppm-load: fix file-loader registration.

Contributors
~~~~~~~~~~~~

Debarshi Ray, Ell, Jordi Mas, Øyvind Kolås, Richard Kreckel, Thomas Manni,
Marco Ciampa, Alexandre Prokoudine and Piotr Drąg.

GEGL-0.3.22 2017-11-12
----------------------

Core
~~~~

Refactored graph traversals to use topological sorts.

Completely avoid loading plug-ins .so with -gpl3 in filename unless the
application using GEGL explicitly has enabled GPL3 operations.

Replace custom property redirection for meta-ops with GBinding.

Reduced temporary buffer allocation overhead in mipmap downscaling.

Do divide and conquer on higher level in point filter/composer op
base-classes.

Migrated from intltool to GNU gettext

Buffer
~~~~~~

Tweak nohalo and lohalo samplers to be orders of magnitude faster for scale
factors > ~3% while also removing possible hangs.

Operations
~~~~~~~~~~

Improved threading awareness/capabilities of gegl:copy-buffer, gegl:wind,
gegl:color-enhance, gegl:photocopy, gegl:matting-levin, npd, contrast-curve,
noise-spread, noise-pick, noise- slur, transform ops.

Use of more modern GLib APIs like g_clear_ and make use of the fact that g_free
is already NULL safe.

Fixed grayscale behavior of gegl:noise-hurl.
OpenCL vs CPU consistency fix for gegl:threshold, and optimization of
gegl:wavelet-blur by decomposing to two 1d passes.
median-blur, perform binning in a more perceptual space.
hue-chroma: added OpenCL support
threshold: make opencl match cpu
wavelet-blur: decompose for performance
illusion: performance improvement permitting partial result computation
grey: add fast path for alpha-less input buffers.

new ops in workshop: spherize, color-to-alpha-plus, shadows-highlights

With contributions from:
~~~~~~~~~~~~~~~~~~~~~~~~

Debarshi Ray, Ell, Jehan, Jordi Mas, Marco Ciampa, Massimo, Nicolas Robidoux,
Niels De Graef, Øyvind Kolås, Piotr Drąg and Thomas Manni.

GEGL-0.3.20 2017-08-15
----------------------

Core
~~~~

Increased max thread limit to 64 threads, and improvements to both buffer and
progress reporting thread safety, point sized buffers are handled better and
COW-tiles are now lock free. Serialization and parsing has been made more
robust.

Operations
~~~~~~~~~~

Improved property meta data for many opertions, two new operations gegl:spiral and gegl:mix.

ff-load/ff-save: make audio frame handling more generic.

c2g, avoid possible infinite loop on transparent areas.

Fixes to gaussian-blur and ops core for multi-threaded blurring.

New binary
~~~~~~~~~~

gcut, a video editing engine for GEGL has also been added to the repo. It
permits reusing image filters written as GEGL operations for video, and basic
motion graphics. The engines data model is currently fully functional for
text-file based input and offline rendering, an experimental user interface for
this video editing system is also currently being worked on.

Contributors
~~~~~~~~~~~~

Øyvind Kolås, Michael Natterer, Jehan, Dimitris Spingos, Piotr Drąg, Alexandre
Prokoudine, Eugene Hopkinson, Ell, Thomas Manni, Jordi Mas, Edward E, Jan
Vesely, Arfrever Frehtes Taifersar Arahesis.

GEGL-0.3.18 2017-05-31
----------------------

Operations
~~~~~~~~~~

warp: performance improvements
displace, map-absolute, map-relative: abyss handling and more 
buffer-source: improved invalidation signalling
text,path: use endian agnostic cairo pixel formats
opencl implementations of: noise-hsv, diffraction-patterns,
gaussian-blur-selective and motion-blur-linear.

Core
~~~~

rerrange connection handling for nodes when changing operation.
gegl-path: improvements for corner cases found in warp
add validation of roi in gegl_operation_get_bounding_box

Contributors
~~~~~~~~~~~~

Ell, Anton Gorenko, Øyvind Kolås, Piotr Drąg, Mario Blättermann 

GEGL-0.3.16 2017-05-15
----------------------

Core
~~~~

Improvements to gegl-chain serialization and documentation.
Remove remnants of deprecated gegl-graph syntactic sugar for C

Buffer
~~~~~~

Avoid choking on 0x0 rectangles, handle implicit mipmap generation for 15bpc
and half precision float pixelformate.

Operations
~~~~~~~~~~

Many operations have gotten an additiona meta-ui description layer sprinkled on
top. And The C source code of the operations is no longer kept as a meta-data
key on the binary, with a shrink of ~10mb it might even impact startup time.

New operations: newsprint/spachrotyzer.
Moved out of workshop: unpremultiply
New in workshop: spiral
drop-shadow: improve edge mode of blur, to work on tiny radiuses.
transform-ops: ported to the new chanting system
ff-load: readjust frame accurate mp4 seeking for newer ffmpeg.
file-loading ops: stop some crashes happening due to invalid/lacking properties.
npy-save, jpg-save, png-save: port to GIO.
raw-load: rotate bounding box based on image meta-data.

Tests
~~~~~

Improve testing by using hashes of autogenerated reference images for
regression testing, thus causing fewer manual steps to add an op with its
tests. Some XML based tests removed as they were fully superceded by new
automated tests.

Documentation
~~~~~~~~~~~~~

Replaced dynamic client side js content with static operation gallery,
incremental improvements to website content. This includes updates to the
meta-data in the .C files of operations.

Contributors
~~~~~~~~~~~~

Daniel Mustieles, Debarshi Ray, Dimitris Spingos (Δημήτρης Σπίγγος), Ell, Jan
Vesely, Jean-Baptiste Mayer, Marco Ciampa, Mario Blättermann, Martin Blanchard,
Michael Natterer, nick black, Øyvind Kolås, Piotr Drąg, Thomas Manni,

GEGL-0.3.14 2017-02-27
----------------------

Buffer
~~~~~~

- changed gegl_buffer_set to accept mipmap level scaled rectangles, similar to
  gegl_buffer_get and gegl_buffer_iterator_new/_add

Operations
~~~~~~~~~~

- made mipmap preview rendering capable: gblur-1d/gaussian blur, sinus,
  transform (rotate, scale, perspective etc), snn-mean
- noise-perlin: remove unused random seed property
- exposure: remove gamma property
- save-pixbuf: allocate less temporary memory
- load-pixbuf: fix rowstride related crasher

Translations
~~~~~~~~~~~~

Slovenian, Russian, Greek, Polish and Catalan translations updated.

Contributors
~~~~~~~~~~~~
Alexandre Prokoudine, Debarshi Ray, Dimitris Spingos (Δημήτρης Σπίγγος), Jordi
Mas, Martin Srebotnjak, Øyvind Kolås


GEGL-0.3.12 2017-02-13
----------------------

Operations
~~~~~~~~~~
- new ops: edge-neon, image-gradient, slic, wavelet-blur, waterpixels, watershed
- moved from workshop to common: color-warp, component-extract
- text: remove now unneeded work-around, ability to control vertical
   positioning, permit <1.0 font-sizes, handle text-color alpha, other
   improvements.
- lens-distortion: default to transparent background
- crop: bounding box computation simplifications
- noise-rgb: add gamma and distribution properties
- dither: renamed from color-reduction and improved ui/property controls.
- high-pass: do inversion, over and contrast in non-linear RGB
- noise-rgb: new linear and gaussian properties
- transform: added a clip-to-input property
- raw-load: improvements to handling of Sony's ARW files
- exposure: replaced offset with black-level
- moved from common to workshop: bilateral-filter-fast
- new workshop ops: bayer-matrix, linear-sinusoid,
 shadows-highlights, integral-image, segment-kmeans,
- removed ops: gaussian-blur-old

Core
~~~~

- less locale dependent serializations/parameters
- fix local raw file detection of ARW and CR2 files
- gegl_memset_pattern performance improvement
- clean up the way we drop references and free memory
- static caching of some frequently used babl formats/types.
- mipmap preview render code fixes for the following subset of operations: point
   operations (filter, and composer subclasses), integer translate, crop.

Translations
~~~~~~~~~~~~

Catalan, German, Greek, Italian, Polish, Portuguese, Slovenian, Swedish translations updated

Contributors
~~~~~~~~~~~~

Piotr Drąg, Marco Ciampa, Sergey "Shnatsel" Davidoff, Ell, Øyvind Kolås, Anders
Jonsson, Thomas Manni, Jordi Mas, Michael Natterer, Peter O'Regan, Jehan Pagès,
Sebastian Rasmussen, Debarshi Ray, Dimitris Spingos (Δημήτρης Σπίγγος), 
Martin Srebotnjak,Miroslav Talasek.


GEGL-0.3.10 2016-11-06
----------------------

buffer
~~~~~~

- stop caching tiles in a singly-linked list; use a hash table only
- adjust box filtering threshold of linear/cubic samplers
- add const qualifier to input rect parameter of gegl_tile_backend_set_extent()
- don't acquire tile storage lock in NN sampler when not using multithreading

operations
~~~~~~~~~~

- rgbe-load: add image/x-hdr mimetype
- map-relative: sample from the pixel centers for integer vectors
- warp: fix and rework the operation, now matches more closely the iWarp behaviour
- color-reduction: add arithmetic dithers; inline for loop for each different method

binary
~~~~~~

speed up some commands by not intializing opencl

json
~~~~

make bundleable

translations
~~~~~~~~~~~~

German, Greek, Italian, Occiatan, Polish, Portuguese, Russian, Serbian, Slovenian, Spanish updated

Contributors
~~~~~~~~~~~~

Simon Budig, Marco Ciampa, Piotr Drąg, Ell, Øyvind Kolås, Roman
Lebedev, Daniel Mustieles, Michael Natterer, Jehan Pagès, Martin
Pelikán, Yolanda Álvarez Pérez, Alexandre Prokoudine, Tiago Santos,
Dimitris Spingos, Martin Srebotnjak, Cédric Valmary, Милош Поповић.

GEGL-0.3.8 2016-06-14
---------------------

Buffer
~~~~~~
- add box filtering downsampling paths to linear and cubic resamplers to improve default results
- clear hot tile when removing a tile from the cache


operations
~~~~~~~~~~

- added: vhsfix (workshop), gegl-gegl (commandline syntax)
- exr-save: port from deprecated chanting system
- ff-save: increase max output packet size from 200kb to 1mb
- gegl-path: add ability to compute y coordinate for a given x
- transform: treat infinite and empty rectangles correctly
-  webp: port webp-save to GIO for URI handling
- ops progress:
    - add gegl_operation_progress function to report processing progress
    - use the new function in cartoon and distance-transform ops
- ops metadata:
    - remove custom multiline paramspec
    - set multiline ui_meta on more ops
    - add reference meta and use it in various ops

gegl-binary
~~~~~~~~~~~

    - add simple video filtering
    - encode audio with video
    - permit dragging and zooming in more ui states
    - deal correctly with integers in ui
    - show prop editor for operation if op chain passed at commmandline


core
~~~~

- gegl-chain
   - implement keyframing of strings
   - suggest possible ops in warninge/errors
- gegl-node: relay property change notifies from operation to node
- gegl-serialize:
    - improve error handling for parsing of properties
    - start handling relative coordinates
    - use path instead of curve
- json: misc improvements and fixes
- opencl: fix RGB luminance constants
- docs: fixes, update some info in directory overview
- handlers:
    - allow registration of operations by MIME type
    - register MIME types for loaders
    - guess file types by sniffing content
- build: fix luajit detection

Contributors
~~~~~~~~~~~~

Timm Bäder, Martin Blanchard, Mario Blättermann, Ell, Piotr Drąg,
Michael Henning, Øyvind Kolås, Hartmut Kuhse, Michael Natterer,
Nils Philippsen, Alexandre Prokoudine, Debarshi Ray, Kristian Rietveld,
Dimitris Spingos, Martin Srebotnjak, Pino Toscano, Cédric Valmary,
Jan Vesely


GEGL-0.3.6 2016-03-12
---------------------

buffer
~~~~~~

COW (Copy on Write) handling for gegl_buffer_clear.

operations
~~~~~~~~~~
    - added: saturation, gaussian-blur-selective
    - ff-load/ ff-save: updated to work with ffmpeg-3.0,configuration of
      codec/format.  misc code cleanup, and meta data improvements, gio
      (url loading) support in more loaders.
    - convolve-generic: optimized paths for common parameters and 3x3 size.
    - removed: dcraw-load
    - jp2, webp, svg::
        make use of GIO for URI handling
 - XML: permit serializing a segment/chain of the graph
 - gegl-binary:
    - permit setting properties of commandline passed ops, as well as
      connecting buffers to aux and other input pads.
    - zoom in/out at cursor position on scroll wheel events.
 - processing: improvements to meta-ops

Contributors
~~~~~~~~~~~~

Øyvind Kolås, Thomas Manni, Michael Natterer, Nils Philippsen, Debarshi
Ray, Martin Blanchard, Justin Lecher, Massimo Valentini, Jonathan Tait,
Mukund Sivaraman, Alexandre Prokoudine, Piotr Drąg, Nanley Chery, Colin
Waters


GEGL-0.3.4 2015-11-24
---------------------

 - 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

Contributors
~~~~~~~~~~~~

Øyvind Kolås, Debarshi Ray and Nils Philippsen

GEGL 0.3.2 2015-11-22
---------------------

Operations
~~~~~~~~~~

- new operations: libraw based raw loading op, tiff-save and tif-load, maze, sepia
- ff-load and ff-save revived, with support from thegrid.io
- apply-lens uses less memory, higher precision computation.
- disable automatic threading on many ops where it fails
- force more operations to prefer operating on linear RGB data for more
accurate/physical processing.

Buffer:
~~~~~~~
- implement abyss paremeter on gegl_buffer_copy and gegl_buffer_blit
- Added start of a microraptor gui based image viewer/non destructive editor.
- Optimizations to scaled blitting (speeds up most GEGL UIs a bit)

Contributiors
~~~~~~~~~~~~~

Alexandre Prokoudine, André Tupinambá, Claude Paroz, Daniel Mustieles,
Debarshi Ray, Dimitris Spingos, Elle Stone, Jehan, Jordi Mas, Marco Ciampa,
Martin Blanchard, Martin Srebotnjak, Massimo Valentini, Michael Henning,
Michael Natterer, Necdet Yücel, Pedro Albuquerque, Piotr Drąg, Roman Lebedev,
Sven Neummann, Thomas Manni, Vilson Vieira, akash akya and Øyvind Kolås.


GEGL-0.3.0 2015-06-03
---------------------

- 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.

Contributors
~~~~~~~~~~~~

Albert F, Alexandre Prokoudine, Alexia Death, Akash Akya, Anders Jonsson,
Andika Triwidada, Andreas Fischer, Angh, Awaw Fumin, Barak Itkin, Bruce
Cowan, Carlos Zubieta, Cédric Valmary, Chris Leonard, Christian Kirbach,
Clayton Walker, Daniel Mustieles, Daniel Nylander, Daniel Sabo, Debarshi Ray,
Denis Knoepfle, Dimitris Papavasiliou, Dimitris Spingos, Djavan Fagundes, Dov
Grobgeld, Elle Stone, Enrico Nicoletto, Felix Ulber, Florian Klemme,
Francisco Vila, Fran Diéguez, Georges Basile Stavracas Neto, Hans Lo, Harald
Korneliussen, Hartmut Kuhse, Inaki Larranaga Murgoitio, Isaac Wagner, Jan
Vesely, Jan Vesely, Jehan, Jon Nordby, Jordi Mas, Kalev Lember, Kristjan
Schmidt, Marco Ciampa, Marek Dvoroznak, Maria Mavridou, Martijn van Beers,
Martin Nordholts, Martin Srebotnjak, Massimo Valentini, Matej Urbančič,
Maxime Nicco, Michael Henning, Michael Muré, Michael Natterer, Mikael
Magnusson, Miroslav Talasek, Muhammet Kara, Mukund Sivaraman, Nana Chery,
Nick Black, Nicolas Robidoux, Nils Philippsen, Norm Murray, Pascal Giessler,
Piotr Drąg, Quentin Glidic, Rafael Ferreira, Rasmus, RPG, Rūdolfs Mazurs,
Samir Ribic, Samuel Pitoiset, sebul, Simon Budig, Sven Claussner, Téo Mazars,
Thomas Manni, Tim Lunn, Tim Mooney, Ting-Wei Lan, Tom Stellard, Ulf-D.
Ehlert, Vadim Rutkovsky, Victor Oliveira, Ville Sokk, Vincent Untz, Yongjia
Zhang, Yongjia Zhang, Øyvind Kolås and 周 周.


GEGL-0.2.0 2012-04-02
---------------------

- OpenCL support
- build improvements.
- High level API to apply ops directly to buffers with arguments.
- Final bits of translation infrastructure.
- Invalidate regions when disconnecting input pads.

Operations
~~~~~~~~~~

- New operation: global-matting
- Allow transform core to do perspective transforms.
- Added string based key/value pairs to operations.
- Added arguments for dealing with scaled down preview rendering.
- Added human interaction ranges and non-linear mapping to properties.

Buffer
~~~~~~

- Removed broken lanczos sampler.
- Add gegl_buffer_set_color and gegl_buffer_set_pattern
- Added ability to drop cached tiles.
- Added API for handling abyss policy (not implemented yet)
- Avoid iterating global tile cache when flushing/destroying buffers
  that have no tiles in the cache.

Contributors
~~~~~~~~~~~~

Øyvind Kolås, Martin Nordholts, Hans Petter Jansson, Mikael Magnusson, Victor
Oliveira, Nils Philippsen, Kevin Cozens, Michael Muré, Jan Rüegg, Michael
Natterer, Michael Henning, Massimo Valentini, Alexandre Prokoudine and
Jon Nordby.

GEGL-0.1.8 2011-11-18
---------------------

- New operations: spread, vignette, map-relative, noise-reduction, plasma,
fractal-trace, exr-save, lens-correct, emboss, cubism, ripple,
color-to-alpha, color-rotate, red-eye-removal, convolution-matrix,
deinterlace, polar-coordinates, lens-distortion, pixelise.

- Split GeglView GTK Widget into separate utility library

- build/test improvements.

Buffer
~~~~~~
- Added lohalo resampler
- API and infrastructure for doing non-affine resamplings.

Contributors
~~~~~~~~~~~~

Øyvind Kolås, Michael Natterer, Barak Itkin, Nils Philippsen, Mukund
Sivaraman, Jon Nordby, Emilio Pozuelo Monfort, Étienne Bersac, Martin
Nordholts, Victor Oliveira, Michael Muré, Michael Schumacher, Adam
Turcotte, Nicolas Robidoux, Robert Sasu, Massimo Valentini, Joao S. O.
Bueno, Hans Lo, Zbigniew Chyla, David Evans and Javier Jardón.


GEGL-0.1.6 2011-02-13
---------------------

- New operations: max-rgb, pixelise, motion blur.
- Fixed a bug in matting-levin that made GEGL halt due to errors
  detected by babl sanity code, this made 0.1.4 be unusable if you had
  all dependendencies when building.
- build/test improvements.

Buffer
~~~~~~

Added API to use external tile backends, allowing to plug-in alien
tilebackends, for GIMP/Krita/OSM or similar.

Contributors
~~~~~~~~~~~~

Tobias Ellinghaus, Øyvind Kolås, Barak Itkin and Martin Nordholts

GEGL-0.1.4 2011-01-20
---------------------

Operations
~~~~~~~~~~
- save (chooses delegate save op automatically)
- rgbe load/save
- jpeg200 load/save
- ppm load/save
- map-absolute (GIMP cage tool gsoc helper op)
- whirl and pinch
- mirrors
- grid render
- fixed imagemagick fallback load op
- fixed pipe based dcraw wrapper
- GSoC 2010 ops: exp-combine, reinhard05, fattal02, mantiuk06, matting-levin
- Various source and build improvements.
- improvements towards threaded rendering

Buffer
~~~~~~

- refactored away some constant overhead made GeglBufferIterator API
  public

Contributors
~~~~~~~~~~~~

Michael Natterer, Øyvind Kolås, Vincent Untz, Kaja Liiv, Nils
Philippsen, Étienne Bersac, Martin Nordholts, Debarshi Ray, Danny
Robson, Stuart Axon, Kao, Mukund Sivaraman, Ruben Vermeersch, Barak
Itkin, Michael Muré, Mikael Magnusson, Patrick Horgan and Andy Gill.

GEGL-0.1.2 2010-02-07
---------------------

- GeglLookup, configurable floating point lookup tables for lazy computation.
- Use GFileIOStream in GeglTileBackendFile.
- Optimizations: in-place processing for point filters/composers,
  SIMD version of gegl:opacity, avoid making unneccesary sub-buffers,
  removed some manual instrumentation from critical paths, improved
  speed of samplers.
- Added xml composition/reference image based regression tests.
- Added performance tracking framework.
- Syntactic sugar using varargs for constructing gegl graphs from C.
- Build fixes on cygwin,
- Gegl# fixes.
- Initial, but unstable code towards multithreading.
- Improvements to lua op in workshop.
- Added new resamplers upsize, upsharp, upsmooth, downsize, downsharp and
  downsmooth.
- Removed gegl:tonemap and gegl:normal ops.

Contributors
~~~~~~~~~~~~

  Martin Nordholts, Sven Neumann, Nils Philippsen, Adam Turcotte,
  Danny Robson, Michael Schumacher, Ruben Vermeersch, Øyvind Kolås,
  Javier Jardón, Yaakov Selkowitz and Michael Natterer, Kaja Liiv
  and Eric Daoust.

GEGL-0.1.0 2009-07-01
---------------------

- Renamed gegl:load-buffer to gegl:buffer-source and gegl:save-buffer
  to gegl:buffer-sink (but the old names still work)
- Represent colors using doubles instead of floats (this change is
  independent from internal processing)
- Removed the GTK+ UI parts of the gegl binary and turned gegl into a
  pure command line tool (which can still visualize stuff with help
  help the SDL based display operation)
- Consider {x=G_MININT/2, y=G_MININT/2, width=G_MAXINT, height=G_MAXINT}
   as the only valid region in which processing may occur. Processing
   outside of this region is undefined behaviour.
- Added support for storing allocation stack traces for GeglBuffers
  so that debugging buffer leaks becomes much easier
- Made small changes and cleanups of the public API, e.g.
   - Removed gegl_node_adapt_child()
   - Made GeglConfig an explicit object
   - Removed most of the ifdeffed stuff to mask away internal
     structures
   - Added gegl_rectangle_infinite_plane() and
     gegl_rectangle_is_infinite_plane()
- Added new sampler GeglSamplerSharp
- Added format property to gegl:buffer-sink
- Cleaned up and made gegl:introspect work again
- Add a bunch of test cases using the automake test system (make check)
  and also port buffer tests to automake
- General cleanups, bug fixes, increased robustness and improved
  documentation

Contributors
~~~~~~~~~~~~

Øyvind Kolås, Sven Neumann, Étienne Bersac, Hubert Figuiere, Martin
Nordholts, Nicolas Robidoux, Michael Natterer, Ruben Vermeersch,
Kevin Cozens, Manish Singh, Gary V. Vaughan, James Legg,
Henrik Åkesson, Fryderyk Dziarmagowski, Ozan Caglayan and
Tobias Mueller.


GEGL-0.0.22 2008-12-31
----------------------

GeglOperation
~~~~~~~~~~~~~
   - operation names are now prefixed, the ops in GEGL use 'gegl:' as prefix.
   - gegl:opacity - combine value and aux mask input when both are available.
   - gegl:src-in - deal correctly with extens.
   - gegl:path - new op covering the stroke/fill needs of SVG.
   - deprecated gegl:shift, the affine family of operations now
     uses the same fast code paths for integer translations.

GeglBuffer
~~~~~~~~~~

   - Profiling motivated speed ups in data reading/writing.
   - Remove left-over swapfiles from dead processes at startup.
 • GeglNode
   - made gegl_node_add_child and gegl_node_remove_child public API. (#507298)

GeglPath
~~~~~~~~

Vector path representation infrastructure, supporting poly lines and
beziers by default, the infrastructure allows extensions from
applications with other curve types (smooth curves, spiro curves and
others.).

Contributors:

Hubert Figuiere, Sven Neumann, Øyvind Kolås, Michael Natterer,
Kevin Cozens, Sam Hocevar, Martin Nordholts, Manish Singh,
Étienne Bersac and Michael Schumacher.

GEGL-0.0.20 2008-10-05
----------------------

 - Build and code clean ups and fixes.
 - RAW loader using libopenraw.

GeglBuffer
~~~~~~~~~~

- Linear buffer support, amongst other things enabling GeglBuffer API access
  to external linear buffers in memory.
- Reworked samplers using a shared caching neighbourhood infrastructure.
- YAFR - a new resampler contributed by Nicolas Robidoux.

GeglVector
~~~~~~~~~~

Added SVG parsing capability (no serialisation yet).

GeglOperations
~~~~~~~~~~~~~~

- Marked user visible strings for translation.
- Added a fill operation that renders a path.

Contributors
~~~~~~~~~~~~

Martin Nordholts, Øyvind Kolås, Sam Hocevar, Manish Singh, Hubert
Figuiere, Sven Neumann and yahvuu at gmail.com.

GEGL-0.0.18 2008-06-14
----------------------

 - Configuration both from commandline arguments and at runtime.

GeglBuffer
~~~~~~~~~~

- New raw tiled raster file format, used both as swap and stored buffers.
- Sharing between processes through synced swap.
- Babl powered scan iteration infrastructure for efficient access.
- Cubic and lanczos samplers re-enabled.

Operations
~~~~~~~~~~

- Use scan iterator for point-filter, point-composer and point-render base
  classes internally for minimal amount of copies.
- Optimized variants of some point and compositing operations reimplemented
  using a new data type /g4float/ that allows writing CPU agnostic vectorized
  code for GCC.
- New temporal filter base class, for operations operating on color values from
  neighbouring frames in a video stream.
- Autogenerated operation reference installed for use with devhelp.
- New operations: write-buffer, v4l, color-temperature.

Contributors
~~~~~~~~~~~~

Øyvind Kolås, Kevin Cozens, Sven Neumann, Manish Singh, Martin Nordholts,
Étienne Bersac, Hans Petter Jansson, Jan Heller, dmacks@netspace.org,
Sven Anders, Hubert Figuiere and Geert Jordaens.

GEGL-0.0.16 2008-02-29
----------------------

 - Install headers for development of external operation plug-ins.
 - Added rowstride argument to gegl_buffer_set ()
 - Made it possible for sink operations to do chunkwise processing
   through GeglProcessor.
   when processed using a GeglProcessor.
 - constification of GeglRectangles and babl formats.
 - Build and dist fixes, plugged annoying buffer leaks, GEGL now
   also works on OSX

Contributors
~~~~~~~~~~~~

Øyvind Kolås, Étienne Bersac, Kevin Cozens, Sven Neumann,
Manish Singh, Michael Natterer, Hans Brauer, Deji Akingunola,
Bradley Broom and Tor Lillqvist.

GEGL-0.0.14 2007-12-20
----------------------

 - Relicensed under LGPLv3+.
 - Per node caches (faster recomputation when properties of nodes in
   composition change)
 - Sampler framework for interpolation.
 - Modified API for retrieving scaled buffers gegl_node_blit / gegl_buffer_get.
 - Renamed XML serialization and parsing API to be descendants of GeglNode.
 - Progress monitoring for GeglProcessor
 - New operation base class GeglOperationAreaFilter
 - API reference installed and browsable using devhelp.
 - New operations: ff-load, mono-mixer, contrast-curve, save-pixbuf,
   compositing ops from SVG-1.2 draft, value-invert, convert-format,
   bilateral-filter, snn-mean

Contributors
~~~~~~~~~~~~

Étienne Bersac, Kevin Cozens, Manish Singh, Mark Probst, Martin Nordholts,
Michael Schumacher, Mukund Sivaraman, Shlomi Fish, Tor Lillqvist and
Øyvind Kolås


GEGL-0.0.12 2007-02-18
----------------------

 - Swapping out of image pyramid.
 - Speedups to text rendering.
 - GEGL compiles on win32
 - GEGL_SWAP now specifies swapdir location.
 - Small refactorings of public API.
 - Changed the XML parser/serializer to not use attributes for node properties.
 - Improvements to documentation.
 - Automagic build environment for operations simplified.
 - Internal API for saving/loading GeglBuffers to/from disk.
 - Ruby, C# and Python bindings added to version control system
   (not included in distributed tarball)

Contributors
~~~~~~~~~~~~

Kevin Cozens, Michael Schumacher. Sven Neumann and Øyvind Kolås,

GEGL-0.0.6 2007-01-07
---------------------

 - hit detection code
 - handling of relative/absolute path names for XML.
 - merged GeglNode and GeglGraph classes.
 - build fixes for Win32 and FreeBSD
 - temporarily disabled custom cairo in test application.
 - png and EXR improvements.

Contributors
~~~~~~~~~~~~

Dominik Ernst, Kevin Cozens, Øyvind Kolås and Michael Schumacher.


GEGL-0.0.4 2006-12-29
---------------------

This was the first public release of GEGL.

- 8bit, 16bit integer and 32bit floating point, RGB, CIE Lab, YCbCr
  and naive CMYK output.
- Extendable through plug-ins.
- XML, C and Python interfaces.
- Memory efficient evaluation of subregions.
- Tiled, sparse, pyramidial and larger than RAM buffers.

Operations
~~~~~~~~~~

- PNG, JPEG, SVG, EXR, RAW and other image sources.
- Arithmetic operations, porter duff compositing operations, SVG blend
  modes, other blend modes, apply mask.
- Gaussian blur.
- Basic color correction tools.
- Most processing done with High Dynamic Range routines.
- Text layouting using pango

Contributors
~~~~~~~~~~~~

Dominik Ernst, Kevin Cozens, Manish Singh, Martin Nordholts, Michael
Natterer.  Philip Lafleur, Sven Neumann and Øyvind Kolås.

GEGL-0.0.0
----------

Contributors:

Calvin Williamson, Caroline Dahloff Daniel Rogers, Garry R. Osgood, Jay
Cox and Sven Neumann

