RELEASES.md

Release Notes

All notable changes to Boost.GIL project will be documented in this file. The format is based on Keep a Changelog.

[1.80.0] - 2022-08-10

NOTICE: We are planning BREAKING switch to C++17 as minimum required C++ language version in one or two releases after Boost 1.80 (Discussion #676)

Added

• GSoC 2020: Added Perona-Malik anisotropic diffusion algorithm [PR #500)
• GSoC 2020: Added histogram class and related functionality (PR #499)
• GSoC 2020: Added histogram equalization feature (PR #514)
• GSoC 2020: Added histogram matching algorithm (PR #515)
• GSoC 2020: Added ability to stack images either horizontally (hstack) or vertically (vstack) (PR #506)
• GSoC 2020: Added adaptive histogram equalization algorithm (PR #516)
• GSoC 2020: Added Standard Hough Transform and circle rasterization (PR #512)
• GSoC 2020: Added Bresenham's algorithm for line rasterization (PR #512)
• GSoC 2021: Added rotation of image by arbitrary angle around its center (PR #565)
• GSoC 2021: Added rasterization support for ellipse based on "An Efficient Ellipse-Drawing Algorithm" by Jerry Van Aken (PR #585)
• Added image constructor from compatible view (PR #520)
• Added inverse function for affine matrix3x2 (PR #527)
• Added standard morphological transformations (PR #541)
• Added for_each_pixel overload for any_image (PR #648)
• Added C++17 polymorphic memory resource typedefs for image class (PR #529)

Changed

• BREAKING: The required minimum C++ version is changed from from C++11 to C++14. Currently, large parts of GIL still compile with a C++11 compiler. However, there is no guarantee that it stays that way, and any compilers that do not support at least C++14 are considered unsupported as of now.
• BREAKING: any_color_converted_view() is deprecated and will be removed in the next release. Use color_converted_view() instead, which provides the same feature.
• BREAKING: apply_operation for any_image is deprecated and will be removed in the next release. Use variant2::visit instead, which provides the same feature. (PR #656)
• documentation: Display that GIL is a header-only library
• Moved numeric extension to core (PR #573)
• Added support for C++17's <filesystem> (PR #636) The availability of the std::filesystem is detected automatically, unless the BOOST_GIL_IO_USE_BOOST_FILESYSTEM macro is defined that forces the preference of the Boost.Filesystem.
• Renamed pixel_multiply_t to pixel_multiplies_t and pixel_divide_t to pixel_divides_t(PR #655)
• Renamed io/dynamic_io_new.hpp to io/detail/dynamic.hpp (PR #653)
• Moved function construct_matched into boost::gil::detail namespace as it was only used by other implementation details (PR #653)
• Made packed_pixel trivially copyable and assignable (PR #679)
• Replace deprecated libtiff v4.3 typedefs with C99 fixed-size integers (#685)

Removed

• BREAKING: Removed support for GCC 5 (PR #572)
• Removed deprecated.hpp (PR #627)

Fixed

• Fixed conversion from RGB to HSL (PR #505)
• Fixed conversion from RGB to signed CMYK (PR #522)
• Removed unnecessary numeric cast in hsv.hpp (PR #530)
• Fixed default constructor for homogeneous_color_base for reference pixel elements (PR #542)
• Fixed returning reference to local temporary object in subchroma_image_view (PR #556)
• Added missing header guards in diffusion.hpp (PR #568)
• Fixed any_image_view<>::const_t (PR #526)
• Fixed C++20 incompatibilities in I/O extensions (PR #617)
• Ensured all examples build without errors (PR #628)
• Fixed convolve_2d for images with float32_t channel model (PR #577)
• Fixed for_each_pixel for non-1d iterable views (PR #621)
• Fixed: is_equal_to_sixteen in PNG I/O was less-than test (PR #650)
• Re-allow devicen_t with two components (PR #654) It was unintentionally removed in Boost 1.72
• Fixed memory leak in image class for empty dimensions (PR #649)

Acknowledgements

Cypre55, Samuel Debionne, Mike-Devel, Edward Diener, Peter Dimov, Omar Emara, Dhruva Gole, Nicolas Herry, Eugene K, Avinal Kumar, Gaurav Kumar, Marco Langer, Pranam Lashkari, Mateusz Łoskot, Giovanni Mascellani, Debabrata Mandal, Gopi Krishna Menon, René Ferdinand Rivera Morell, Felix Morgner, Harshit Pant, Paul92, André Schröder, Scramjet911, Siddharth, Dirk Stolle, Prathamesh Tagore, theroyn, Olzhas Zhumabek

[1.75.0] - 2020-12-09

BREAKING: In next release, we are going to drop support for GCC 5. We may also change the required minimum C++ version from C++11 to C++14.

[1.74.0] - 2020-08-12

Added

• Added new constructor initializing any_image from r-value reference to any image (PR #486)
• Implemented mechanism to reverse kernel_2d (PR #489)

Changed

• BREAKING: Replace Boost.Variant with Boost.Variant2 (PR #474) which completes removal on uses of Boost.MPL (missing from Boost 1.72.0 change added PR #274).
• Use perfect forwarding from apply_operation to visit (PR #491)

Removed

• BREAKING: Removed dependency on Boost.Variant

Fixed

• Fixed invalid conversion from RGB8 to CMYK32 due to overflow (PR #470)
• Fixed image constructor from other image (PR #477)
• Fixed error plane_view_t is not a class or namespace name (PR #481)
• Fixed interleaved_view factory using point<std::ptrdiff_t> for dimension (PR #487)
• Fixed documentation replacing uses MPL with MP11 in tutorial (PR #494)
• Fixed missing header in numeric/kernel.hpp to make it self-contained (PR #502)

Acknowledgements

Samuel Debionne, Pranam Lashkari, Mateusz Loskot, Debabrata Mandal

[1.73.0] - 2020-04-22

Added

• Added move constructor and move assignment operator to image class (PR #457).
• New member function size() in any_image_view class (PR #456).
• Numerous new test cases for existing features.

Changed

• Replace Boost.Test with Boost.LightweightTest as the only test framework used in GIL (PR #459 and PR #464). This also restructured the test/extension/io/ sub-tree and targets in related Jamfile-s.
• Removed remaining uses of Boost.MPL (PR #441.
• Renamed all macros using BOOST_GIL_ prefix (PR #411).
• Renamed all CMake configuration options using BOOST_GIL_ prefix (PR #419).

Removed

• Removed extension/dynamic_image/reduce.hpp as unused and possibly unfinished (PR #466). An implementation attempt of techniques described in the paper Efficient Run-Time Dispatching in Generic Programming with Minimal Code Bloat by Lubomir Bourdev, Jaakko Jarvi.
• Removed direct dependency on Boost.MPL, Boost.System and Boost.Test.
• Started removing public macros for compile-time configuration of I/O extension tests, i.e. BOOST_GIL_IO_TEST_ALLOW_READING_IMAGES and BOOST_GIL_IO_TEST_ALLOW_WRITING_IMAGES. Instead, if a test target is built, it builds all its test cases unconditionally.

Fixed

• Avoid longjmp interaction during destruction of I/O extension objects (PR #433).
• Fixed missing alignment default value in constructor of image class (PR #429).
• Fixed segmentation fault when reading corrupted PNG file (PR #414).
• Fixed illegal initialization of return values in the old IOv1 interface of I/O extension (PR #409).

Acknowledgements

Samuel Debionne, Thiago Henrique Hüpner, Pranam Lashkari, Mateusz Loskot, Debabrata Mandal, Olzhas Zhumabek

[1.72.0] - 2019-12-11

Added

• GSoC 2019: Lanczos resampling for image down scaling (PR #309).
• GSoC 2019: Methods for binary thresholding, inverted binary thresholding and truncation thresholding (PR #313).
• GSoC 2019: Otsu thresholding method (PR #314).
• GSoC 2019: Adaptive thresholding using mean of the neighbourhood area (PR #341).
• GSoC 2019: Adaptive thresholding using gaussian-weighted sum of the neighbourhood area (PR #379).
• GSoC 2019: Harris response calculation (corner detector without non-maximum filtering) (PR #350).
• GSoC 2019: Hessian corner detector (PR #364).
• GSoC 2019: Types for defining 2D kernel, kernel_2d and kernel_2d_fixed, in Numeric extension (PR #361).
• GSoC 2019: Implementation of 2D convolution as new function convolve_2d (PR #367).
• GSoC 2019: Box filtering using the average filter (PR #383).
• GSoC 2019: Blur function based on normalized mean filter (PR #383).
• GSoC 2019: Sobel and Scharr operators (PR #392).
• GSoC 2019: Median filter to remove noise from image (PR #393).
• Continued adding new test cases and significantly improved overall test coverage.
• Documented purpose of cached_location_t (PR #287).
• Function convolve_1d in Numeric extension for convenient use of convolve_rows and convolve_cols (PR #347 and PR #367).
• Function extend_boundary in Numeric extension to perform image boundary extension (PR #386).
• Project release notes maintained in Markdown file RELEASES.md (PR #404).

Changed

• Move all tests, core features and extensions, inside test/ directory (PR #302).

Removed

• BREAKING: Replace Boost.MPL with Boost.MP11 (PR #274).
• Removed use of Boost.TypeTraits (PR #274).
• Dropped support for GCC <= 4.8 (PR #296).
• Remove include/boost/gil/version.hpp file as unused (PR #403).

Fixed

• Undetermined value of default-initialized channel and pixel objects (PR #273).
• Undefined behaviour due to std::is_trivially_default_constructible specializations (PR #284).
• Crash when reading PNG files with an invalid header (PR #385).
• Applied the Rule of Three for numerous types.
• Removed uses of deprecated implicit definition of defaulted copy assignment operator or copy constructor.

Acknowledgements

Samuel Debionne, Tyler Deuty, Jean-David Gadina, Jan Houska, Pranam Lashkari, Mateusz Loskot, Stefan Seefeld, Miral Shah, Olzhas Zhumabek

[1.70.0] - 2019-04-12

Added

• Numerous new test cases for existing features.
• C++11 requirements checks to Boost.Build Jamfiles (PR #260).

Changed

• Split single boost/gil/concepts.hpp into multiple boost/gil/concepts/*.hpp headers (PR #169).
• Removed uses of boost::enable_if with std::enable_if (PR #215).
• Replaced own implementation of variant type used for any_image with Boost.Variant (PR #231).
• Moved original all-in-one test suite to test/legacy/ (PR #239).
• Continued C++ modernization of the library source code.

Removed

• Remove uses of deprecated std::unary_function and std::binary_function (PR #191).
• Removed uses of Boost.StaticAssert (PR #207).
• Removed uses of BOOST_STATIC_CONSTANT (PR #211).
• Removed uses of Boost.Function (PR #213), Boost.Bind and Boost.Lambda (PR #212).

Fixed

• Fixed access to non-type results of metafunctions calls using ::value convention (PR #262).

Acknowledgements

Samuel Debionne, Mateusz Loskot, Nikita Kniazev, Stefan Seefeld

[1.69.0] - 2018-12-12

Changed

• Refactored library includes to #include <boost/gil/...> structure (PR #145).

Removed

• Header include/boost/gil_all.hpp file as deprecated (PR #145).
• Header include/boost/gil_concepts.hpp file as deprecated (PR #145).
• Header include/boost/gil_config.hpp file as unnecessary (PR #144).

Fixed

• Fixed point<T> divide and multiply to not to hardcode result as point<double> (PR #157).
• Fixed conflict between std::fill_n and boost::range::fill_n (PR #152).
• Fixed issue with re-assignment of functor from for_each_pixel (PR #139).
• Fixed missing template keyword prior to dependent name axis_iterator (PR #129).
• Fixed loading of grayscale PNG with alpha channel (tRNS chunks) (PR #118).

Acknowledgements

Mateusz Loskot, Marcel Metz, Stefan Seefeld

[1.68.0] - 2018-08-09

Added

• BREAKING: The library now requires a C++11-compliant compiler.
• New top-level all-in-one include/boost/gil.hpp header.
• Added Toolbox extension following the review and acceptance into Boost.

Changed

• The I/O extensions have been entirely rewritten as I/O v2, reviewed and accepted into Boost.
• Documentation has been reformatted and updated.

Removed

• The existing I/O v1 extension has been replaced with I/O v2.

Acknowledgements

Niklas Angare, Jan Beich, Edward Diener, Peter Dimov, Daniela Engert, Bill Gallafent, Christian Henning, Daniel James, Nikita Kniazev, Mateusz Loskot, Marcel Metz, Martin Osborne, Antony Polukhin, Stefan Seefeld

[1.53.0] - 2013-02-04

Fixed

• Fixed self-assignment warnings (Trac #4919).

Acknowledgements

Lubomir Bourdev, Marshall Clow, Beman Dawes, Daniela Engert, Bill Gallafent, Doug Gregor, Boris Gubenko, Christian Henning, Michael Jackson, Daniel James, Hailin Jin, Nikita Kniazev, Mateusz Loskot, John Maddock, Marcel Metz, Antony Polukhin, Stefan Seefeld

[1.35.0] - 2008-03-29

Added

• First Boost release of Generic Image Library developed by Lubomir Bourdev and Hailin Jin following the review and acceptance into Boost.

Acknowledgements

Lubomir Bourdev, Beman Dawes, Hailin Jin, John Maddock and all the reviewers of the library.

---

Pre-Boost History of the Generic Image Library (GIL) by Adobe

The log of changes prior the first release of GIL as part of Boost was collected from https://stlab.adobe.com/gil/news.html site and linked PDF documents with detailed changes.

---

[2.1.1] - 2007-09-15

Changed

• Swapped template arguments for color_element_type, color_element_reference_type and color_element_const_reference_type to take ColorBase first for consistency with the other similar metafunctions.

Fixed

• Minor bugs fixed.

[2.1.0] - 2007-06-17

Added

• Added support for accessing raw memory from image views by getting raw pointer to the beginning of the memory associated with a homogeneous image view using new functions interleaved_view_get_raw_data or planar_view_get_raw_data.
• Support for non-byte-aligned images (e.g. 6-bit RGB222, or 1-bit grayscale). To support bit distance, we are using the same classes that were providing byte distance (byte_addressible_step_iterator, byte_addressible_2d_locator, etc.) except that now they operate on memory units instead of bytes. A memory unit can currently be either a byte or a bit.
• New byte_to_memunit function required by the MemoryBasedIteratorConcept, which specifies the number of bits per memory unit (either 1 or 8).
• New classes for references and iterators over bit-aligned pixels: bit_aligned_pixel_reference, bit_aligned_pixel_iterator. The memory unit of bit aligned pixel iterators is a bit, i.e. byte_to_unit<bit_aligned_pixel_iterator<T> >::value == 8.
• The value_type of a bit-aligned image is a packed_pixel (new name, see below). A packed pixel is a pixel that is byte-aligned but whose channels may not be byte aligned. There is a strong analogy with the way interleaved and planar images are implemented, with packed_pixel corresponding to pixel, bit_aligned_pixel_reference corresponding to planar_pixel_reference and bit_aligned_pixel_iterator corresponding to planar_pixel_iterator.
• New metafunction bit_aligned_image_type for constructing bit-aligned images. A bit-aligned image is an image whose pixels may not be byte-aligned (such as an RGB222 image).
• New metafunction pixel_value_type for constructing homogenous pixel value from elements.
• New metafunction packed_pixel_type for constructing homogenous packed pixel from elements.
• New metafunction packed_image_type for constructing packed images with packed pixel as its value_type.

Changed

• Renamed heterogeneous_packed_pixel to packed_pixel.
• Renamed ByteAdvancableIteratorConcept to MemoryBasedIteratorConcept.
• Renamed byte_addressable_{step_iterator,2d_locator} to memory_based_{step_iterator,2d_locator}.
• Renamed byte_{advance,advanced,distance,step} to memunit_{advance,advanced,distance,step},
• Renamed locator::row_bytes() to locator::row_size() and locator::pix_bytestep() to locator::pixel_size().
• Simplified packed_channel_reference and packed_dynamic_channel_reference by removing the BitField parameter (it is now computed automatically).
• Improved channel_convert - it is faster by switching to floating-point math only if necessary.

Fixed

• Fixed a roundoff bug in the conversion (related to floating-point math switching).
• Fixed histogram regression tests.

[2.0.x] - 2007-03-27

Changed

• Minor bug fixes.
• Regression test improvements.

Removed

• Removed any external dependencies from the regression tests.

[2.0.0] - 2007-03-08

Added

• Further Boost integration:
  • Directories follow the Boost convention.
  • Different models are usually now split in separate files.
  • Renamed some files for better consistency.
  • Renamed classes, functions and template arguments with longer but clearer and more consistent names.
• New deprecated.hpp - a file that maps many of the deprecated names to current ones. Including it will help porting your code to GIL 2.0. After porting to GIL 2.0, however, make sure that your code works when this file is not included.
• New swap function required for reference proxies, since the std::swap default does not do the right thing.
• Metafunctions iterator_type_from_pixel and view_type_from_pixel to allow creating standard iterators and views associated with a pixel type.
• New scoped_channel_value, a channel adaptor that changes the operational range of a channel. bits32f is defined as a float with range 0.0 to 1.0.
• New packed_channel_value, packed_channel_reference and packed_dynamic_channel_reference which model channels operating on bit ranges.
• New heterogeneous_packed_pixel, a model of a pixel whose channels are bit ranges (e.g. 16-bit RGB pixel in the 565 format).
• Metafunctions to get the k-th element of a color base (or its reference): kth_semantic_element_type, kth_semantic_element_reference_type, kth_semantic_element_const_reference_type.
• Metafunctions to operate on pixel iterator: const_iterator_type, iterator_is_mutable, is_iterator_adaptor.
• New image view algorithms uninitialized_fill_pixels, uninitialized_copy_pixels and method is_1d_traversable.
• Added support for creating images with a new value to fill.

Changed

• Updated the design guide and tutorial, updated syntax of concepts to the latest concepts proposal.
• In image, image_view, any_image, any_image_view: There are no longer global functions get_width(), get_height(), get_dimensions(), num_channels(). Use methods width(), height(), dimensions() instead.
• In models of pixel, pixel iterator, pixel locator, image view and image: There used to be different ways of getting to a pixel, channel, color space, etc. of an image view, pixel, locator, iterator and image (e.g. traits, member typedefs). Now all pixel-based GIL constructs (pixels, pixel iterators, locators, image views and images) model PixelBasedConcept, which means they provide the following metafunctions: color_space_type, channel_mapping_type, is_planar, num_channels and for homogeneous constructs we also have: channel_type. To get the pixel type or pixel reference/const reference type of an image, image view, locator and pixel, use member typedefs value_type, reference and const_reference.
• In locator, image, image_view, any_image and any_image_view: Removed dynamic_x_step_t, dynamic_y_step_t, dynamic_xy_step_t and dynamic_xy_step_transposed_t as member typedefs of locators and image views. Instead, there are separate concepts HasDynamicXStepTypeConcept, HasDynamicYStepTypeConcept, HasTransposedTypeConcept which all GIL-provided locators, views and images model. Those concepts require a metafunction to get the corresponding type. Analogously, all GIL pixel iterators model HasDynamicXStepTypeConcept.
• In channel, the min and max value is now part of the channel traits. For all built-in types the channel range equals the physical range (as determined by std::numeric_traits<T>::max()).
• Provide channel_convert support to convert between any of the GIL-provided channel types. The operation is also consistent - conversion is done as a linear mapping that maps the min/max to the min/max.
• In pixel, major redesign of pixel-level constructs. Renamed color_base to homogeneous_color_base and defined it once, not for each color space. The color base is a first-class concept and allows to model any bundle of color elements. Work needed to define a new color space has been simplified a lot. All former pixel-level algorithms and accessors now operate on color bases. The elements of a color base can be accessed by physical or semantic index or by name (channel names can no longer be accessed as members of the pixel e.g. my_pixel.gray = 0), use get_color instead).
• In color base, algorithms now can take heterogeneous pixels (i.e. pixels each channel of which may have a different type). The color_convert can operate on heterogeneous pixels with the exception of to/from RGBA.
• In image, the class image is no longer templated over the image view. It is now templated over pixel value.
• In dynamic image, instead of removed cross_vector_image_types and cross_vector_image_view_types, create MPL vector to enumerate types.
• Renamed algorithms {copy,equal,fill,for_each,generate,max,min,transform}_channels to static_{copy,equal,fill,for_each,generate,max,min,transform}.
• Rename metafunctions channel to at_c, semantic_channel to semantic_at_c, get_nth_channel to dynamic_at_c.
• Renamed planar_{ptr,ref} to planar_pixel_{iterator,reference}.
• Renamed PixelConcept to HomogeneousPixelConcept.
• Renamed HeterogeneousPixelConcept to PixelConcept.
• Renamed pixel_image_iterator to iterator_from_2d.
• Renamed is_contiguous to is_1d_traversable.
• Renamed membased_2d_locator to byte_addressable_2d_locator.
• Renamed resize_clobber_image to image::recreate.

Fixed

• Now compiles with GCC 4.1.1.
• Fixed some bugs in defining reference proxies.

Removed

• Flattened the core directory as part of Boost integration.
• Got rid of channel accessors from pixel types.
• Got rid of pixel_traits. Use nested typedefs value_type, reference and const_reference or metafunctions implementing PixelBasedConcept.
• Got rid of pixel_iterator_traits. Use std::iterator_traits, PixelBasedConcept metafunctions or the new metafunctions for pixel iterators.
• Got rid of the ability to directly access pixels through image, only through views. The image no longer models STL's random access container concept.
• No more LAB and HSB color space, because there is no color conversion support implemented for these. New color spaces can be added with just a few lines of code.

[1.x] - 2007-01-03

Added

• Restored back the ability to assign a channel to a grayscale pixel.

Changed

• Fixed some minor issues with color converted views of dynamic images.

[1.x] - 2006-11-07

GIL accepted to Boost.

GIL's Boost review was successful and GIL will be part of the Boost libraries. It will most likely first appear in the 1.35 version of Boost. In the future our web page will continue to provide you with the latest improvements to GIL, as we have the flexibility to release more frequently than Boost.

[1.x] - 2006-10-20

Added

• New regression tests.
• Source code of usage examples is available to download from the website.

Changed

• Minor changes to GIL core.

[1.x] - 2006-10-02

Added

• First version of the Numeric extension. The extension provides some basic image processing algorithms, such as convolution and resampling.
• Introduction of pixel traits.

Changed

• Improved consistent use of MPL predicates and standardized template parameter names.

[1.x] - 2006-09-20

Added

• GIL now allows users to overload the default color conversion with one of their own.
• Section in the design guide describes how to overload default color conversion.

Changed

• Color conversion improvements.

[1.0] - 2006-08-29

Added

• Pixel dereference adaptors are introduced.
• Locator concepts/models are made more generic.
• Example of creating the Mandelbrot set is described in the tutorial.

Changed

• It is now easier to construct virtual image views.

[] - 2006-06-27

Added

• A GIL Flash presentation is posted (aka video lecture).

[] - 2006-06-14

Added

• GIL homepage goes live