What's Changed

• Install gtl/unaligned.h by @jmr in #482
• s1angle: Fix typo in comment by @jmr in #484

Full Changelog: v0.13.0...v0.13.1

Interface Changes

• Bump required versions
  • abseil-cpp: LTS 20250814
  • clang: 14
  • CMake: 3.22
  • OpenSSL: 1.1
• Require C++17

Fixes/enhancements

• New function: S2DensityTree::Dilate
• S2CellId: Make lookup tables constexpr, removing runtime init
• New S2Cell::IsDistanceLess and related predicates
• Do not use #pragma STDC FP_CONTRACT off for gcc to try to
  prevent warnings. gcc has its own pragma (which was always
  used)
• Switch some ABSL_LOG(ERROR)s to DFATAL
• New functions
  • MutableS2ShapeIndex::Remove()
  • S2EdgeVectorShape::set_dimension()
  • S2Polygon::MakeFull()
• Modernize ExactFloat interface
  • Replace exactfloat::is_nan() with isnan(const ExactFloat&)
  • Replace ToDouble() with explicit operator double()
  • Add fpclassify(const ExactFloat&)
• Fix S2ShapeNestingQuery when two chains share a vertex
• Fix S2Polygon bug when intersecting polyline
• Add S2ClosestEdgeQuery::VisitClosestShapes
• Delete deprecated S2Error::text(); use message() instead
• Ensure _fp_contract_off.h is included everywhere
• Add thread annotations to SpinLock
• Convert many const vector<>&s to Span<>s
• Add noexcept to move operators
• Make some comparisons stable for sorting
• Guard against overflow in Decode functions
• Remove S2_DEFINE_* flags macros and use ABSL_FLAG directly

What's Changed

• Fixed where cc_configure_extension comes from. by @vtsao-openai in #410
• S1Angle::SinCos: Disable sincos for glibc by @jmr in #414
• workflows: Disable macos and enable ubuntu-22 by @jmr in #412
• Fix some comments in s2builderutil_snap_functions by @rsned in #418
• Update s2builder.h comments by @rsned in #419
• CMakeLists: Make installation optional by @idevtm in #421
• CMakeLists: Work around clang sized dealloc bug by @jmr in #422
• dependabot.yml: Add daily github-actions update by @jmr in #424
• MODULE.bazel: Update by @rsned in #427
• test.yml: build with --parallel by @jmr in #429
• test.yml: Run with ctest --parallel by @jmr in #430
• GetCommonAncestorLevel: work around bit_width return type bug by @idevtm in #431
• Try to fix CMakeLists.txt by @MBkkt in #433
• Fix warnings by @MBkkt in #436
• Remove incorrect thread-safety annotation by @MBkkt in #437
• Update to 2025-07-09 google3 version by @jmr in #440
• README.md: Bump abseil-cpp and C++ version by @jmr in #444
• exactfloat: Replace port.h macros with absl::endian by @jmr in #445
• Publish smcallis's username by @jmr in #443
• Add design docs for S2ValidationQuery by @smcallis in #442
• Add tag_regex for dynamic version by @b4rdos in #451
• Update to 2025-09-24 google3 version by @jmr in #454
• Fix bazel build by @jmr in #455
• bazel.yml: Add Bazel workflow by @jmr in #459
• Update to 2025-10-24 google3 version by @jmr in #465
• Update to 2025-11-06 google3 version by @jmr in #472

New Contributors

• @vtsao-openai made their first contribution in #410
• @rsned made their first contribution in #418
• @idevtm made their first contribution in #421
• @smcallis made their first contribution in #442
• @dependabot[bot] made their first contribution in #447
• @b4rdos made their first contribution in #451

Full Changelog: v0.12.0...v0.13.0

Interface Changes

• Remove glog and gflags dependencies. Now abseil-cpp is used.
  • ABSL_LOG macros are used instead of S2_LOG
    • The indirection could be added back if requested
  • ABSL_CHECK macros are used instead of S2_CHECK
  • S2_DEFINE_ now forwards to ABSL_FLAG
• New files:
  • s2chain_interpolation_query
  • s2density_tree
  • s2gmock_matchers
  • s2fractal
  • s2shapeutil_count_vertices
  • s2shapeutil_edge_wrap
• New S2Shape functions:
  • Incoming
  • Outgoing
  • IncidentOn
• Remove S2Shape::id()
• New predicates in s2predicates.h
• S2Region::GetCellUnionBound is now pure virtual
• Replace S2Testing::Random, which was based on random(3), with
  new s2random:: namespace, based on abseil-cpp's random library.
  This removes the use of global state.
• Use int64_t instead of int64, etc.
• constexpr fixes
• Remove some old SWIG workarounds.
• Now requires abseil-cpp LTS 20240116
• S2Shape derived classes: Add decoding interface with S2Error
• S2Error: Interface is now similar to absl::Status, just with a
  different error code type. In the future, this will probably
  be replaced by absl::Status.
• S2CellId: Made some functions constexpr
• s2edge_crossings: Fix CompareEdges for a case that never happens
• S2Polygon uses new S2LegacyValidQuery to validate geometry.
• S2ValidationQuery: New class

What's Changed

• Avoid deprecated std::iterator by @pateldeev in #353
• abseil-cpp supports vlog by @pateldeev in #354
• Update to latest google3 version by @jmr in #360
• Remove unused variable by @MBkkt in #366
• Update to 2024-06-21 google3 version by @jmr in #367
• Fix big endian build by @rschu1ze in #372
• Fix build with libcxx16 by @rschu1ze in #373
• Create and install a cmake config version file by @benbovy in #377
• Fix typos by @mwtoews in #378
• A bazel build and regression harness for s2geometry by @spendres in #361
• apply PEP621 by @zacharyburnett in #388
• Update CMakeLists.txt for python bindings by @andyneff in #394
• s2loop_measures_test: Disable GetSignedArea on arm64 macOS by @jmr in #396
• README.md: Update macOS instructions by @jmr in #397
• Fix macos build error by @andyneff in #399
• #402 update googletest for bazel build by @spendres in #404
• Update to latest google3 version by @jmr in #403
• Suggested fix for linking by @andyneff in #405
• automatically build library with cmake and test with ctest by @zacharyburnett in #390
• Skip GetSignedArea.ErrorAccumulation test on macOS by @jmr in #407

New Contributors

• @pateldeev made their first contribution in #353
• @rschu1ze made their first contribution in #372
• @benbovy made their first contribution in #377
• @mwtoews made their first contribution in #378
• @spendres made their first contribution in #361
• @zacharyburnett made their first contribution in #388
• @andyneff made their first contribution in #394

Full Changelog: v0.11.1...v0.12.0

What's Changed

• Fix vs2019 & namespace for install targets by @jherico in #349

Full Changelog: v0.11.0...v0.11.1

Interface Changes

• Add new files:
  • s2hausdorff_distance_query: Computes "discrete" Hausdorff distance
  • s2shape_nesting_query: Allows shell/hole queries
• Add move constructors/assignment for many types
• Remove deprecated Interpolate(t, a, b) (use Interpolate(a, b, t))
• Add AbslHashValue for S2CellUnion
• Require C++14 instead of C++11 (abseil-cpp requires it now)
• Require googletest >= 1.10 (for gmock)
• Location is now specified with -DGOOGLETEST_ROOT
• New classes:
  • S2CellIterator
  • S2CellIteratorJoin
  • S2Coder
• New StableAngle function
• Delete many deprecated functions
• S2Point is now a different class from Vector3_d, not a typedef for it
• New edge/circle intersection ordering predicates
• New functions GetUVCoordOfEdge and GetIJCoordOfEdge
• Replace const char * with absl::string_view

What's Changed

• Update to 2022-04-08 google3 version by @jmr in #239
• Update to latest google3 version by @jmr in #254
• Fix build on big-endian architectures by @kgotlinux in #258
• Fix RemoveLast by @MBkkt in #267
• python: Named component accessors for S2Point by @podsvirov in #268
• Expose more functionality via the SWIG wrapper by @MikePlayle in #257
• Fix -DCMAKE_CXX_STANDARD ignored by CMakeLists by @LafeWessel in #273
• fix little typo problem in README.md by @MarkLai0317 in #274
• README.md: Add warning about API/ABI stability by @jmr in #281
• Fix undefined sanitizer issue in compact_array by @MBkkt in #284
• Allow already have abseil by @MBkkt in #285
• Remove trailing null from Python strings by @MikePlayle in #282
• Add missing comment by @MBkkt in #286
• Fix possible warning in header by @MBkkt in #287
• Fix missing include by @MBkkt in #291
• Remove unused variables by @MBkkt in #293
• Update to latest google3 version by @jmr in #297
• Fix address sanitizer issue in S2Loop move ctor/assign by @MBkkt in #298
• Add S2_USE_SYSTEM_INCLUDES cmake options to avoid s2 compile time warnings… by @MBkkt in #300
• Update to latest google3 version by @jmr in #312
• Add ability to create Python wheels by @selimnairb in #313
• value_lexicon: Fix build with abseil LTS 2023-08-02 by @acelyc111 in #334
• Add a CMake option BUILD_TESTS to decide whether to build S2 unit tests by @acelyc111 in #333
• Fix several MSVC build issues by @jherico in #338
• Add modern cmake config targets to s2geometry by @jherico in #339

New Contributors

• @kgotlinux made their first contribution in #258
• @MikePlayle made their first contribution in #257
• @LafeWessel made their first contribution in #273
• @MarkLai0317 made their first contribution in #274
• @selimnairb made their first contribution in #313
• @acelyc111 made their first contribution in #334
• @jherico made their first contribution in #338

Full Changelog: v0.10.0...v0.11.0

• Add new files
  • s2buffer_operation
  • s2builderutil_get_snapped_winding_delta
  • s2builderutil_lax_polyline_layer
  • s2memory_tracker
  • s2shapeutil_conversion
  • s2winding_operation
  • s2wrapped_shape
  • thread_testing
• Expose some new functions in pywraps2
• Remove internal absl; depend on released absl
• Require SWIG 4
• Remove internal files that are no longer needed
• Improved documentation of EncodedS2ShapeIndex
• Fix accidental dependence on gtest even when not enabled.

• Add new files
  • s2buffer_operation
  • s2builderutil_get_snapped_winding_delta
  • s2builderutil_lax_polyline_layer
  • s2memory_tracker
  • s2shapeutil_conversion
  • s2winding_operation
  • s2wrapped_shape
  • thread_testing
• Expose some new functions in pywraps2
• Remove internal absl; depend on released absl
• Require SWIG 4
• Remove internal files that are no longer needed
• Improved documentation of EncodedS2ShapeIndex

The same as v0.9.0-2019.03.04.00.

Fix gunit_prod dependency.

Changes since v0.9.0-2019.02.11.00:

New functionality:

• Add S2ShapeIndex Dump function
• Add Init to Graph nested classes
• S2Polygon::InitToOperation: Propagate S2Error

Bug fixes:

• Fix S2BooleanOperation empty/full handling
• Minor compilation fixes for nacl
• Fix LaxPolygonLayer bug
• Fix rare bug in S2BooleanOperation
• Fix rare bug in VisitCrossingEdgePairs
• Fix UB discovered by -D_GLIBCXX_DEBUG
• S2Cap::Add: Fix bug with empty other cap
• OwningShape: Fix potential memory leak
• S2Builder: Clear layer_is_full_polygon_predicates_
• S2EdgeTesselator: Improve error estimation