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OpenImageIO 3.0 Deprecations

For minor or patch releases, we try very hard to never fully remove functionality that will force downstream applications using OpenImageIO to change their source code. However, for major releases (e.g., 2.x -> 3.0), which only occur once every several years, we allow removal of functionality.

OpenImageIO v3.0 is a major release that includes removal of many long-deprecated API facets. This document lists the deprecations and removals.

NOTE: This is an in-progress document. Some things currently only warning about being deprecated will be removed in the final 3.0 release.

Glossary

  • "Marked as deprecated" means that we consider an API facet to be obsolete, and document it as such in the comments or documentation (or remove it from the documentation).

  • "Deprecation warning" means that a deprecated function is tagged with attributes that should cause a compiler warning if the function is used. The warning can be disabled by the downstream project, but it is recommended that you fix the code to use the new API before it is permanently removed.

  • "Removed" means that the deprecated API facet has been removed from the library completely.

argparse.h

  • Several long-deprecated old method names now will give deprecation warnings if used. Most notable are parse() (you should use parse_args() instead) and usage() (use print_help() instead).

array_view.h

  • This header has been eliminated. It originally had the template array_view, which many years ago was renamed span<> and lives in span.h, and since then the array_view.h header has merely made an alias.

bit.h

  • The bit_cast template, which was deprecated and warned since 2.5, has been removed. It was confusing because C++23 has a std::bit_cast that used the reverse order of arguments. Users should instead use std::bit_cast (if C++23) or the equivalent OIIO::bitcast.
  • The rotl32 and rotl64 functions which have been marked as deprecated since 2.1 now have deprecation warnings. Use rotl instead.

benchmark.h

  • The full time_trial() function now has deprecation warnings. Users should generally use the Benchmrker class instead.
  • The abbreviated time_trial() function (that lacks a repeats parameter has been removed.

color.h

  • ColorConfig::error() now has a deprecation warning. Use ColorConfig::has_error() instead.
  • The versions of createDisplayTransform() that lack an inverse parameter now have deprecation warnings. Use the version that takes an inverse bool.

dassert.h

  • Poorly named ASSERT, DASSERT, and ASSERTMSG macros have been removed. They were deprecated since 2.1, since they could easily clash with macros from other projects. Please instead use the OIIO_ASSERT, OIIO_DASSERT, and OIIO_ASSERT_MSG macros.

errorhandler.h

  • All of the old methods that did printf-style formatting have been deprecated (info/infof, warning/warningf, error/errorf, severe/severef, message/messagef, debug/debugf). Instead, use infofmt, warningfmt, errorfmt, severefmt, messagefmt, debugfmt, respectively, which all use the std::format notation.

imagebuf.h

  • Add deprecation warnings to the varieties of ImageBuf constructor and reset() that don't take subimage and miplevel parameters, which have been marked as deprecated since OIIO 2.2. The equivalent is to just pass 0 for both of those parameters.
  • The misspelled ImageBuf::make_writeable() has been given deprecation warnings. Since OIIO 2.2, we have used the correct spelling, make_writable.
  • The ImageBuf::error() method that uses printf-style formatting conventions now has deprecation warnings. Use ImageBuf::errorfmt() instead.
  • The ImageBuf::interppixel_NDC_full() method, which has been marked as deprecated since OIIO 1.5, now has deprecation warnings. Use interppixel_NDC() instead.

imageio.h

  • The global OIIO::attribute query "opencv_version" has been removed. The libOpenImageIO library itself no longer has OpenCV as a dependency or links against it. (However, the IBA functions involving OpenCV still exist and are defined in imagebufalgo_opencv.h as inline functions, so it is up to the application calling these API functions to find and link against OpenCV.)
  • The old varieties of ImageInput::read_scanlines, read_tiles, and read_image that did not take subimage and miplevel parameters, and were not thread-safe, have been removed. These have been marked as deprecated since OIIO 2.0.
  • The type aliases ImageIOParameter and ImageIOParameterList, which have been marked as deprecated since OIIO 2.0, have been removed. Use ParamValue and ParamValueList instead.
  • The utility functions convert_image and parallel_convert_image (the variety that took alpha_channel and z_channel arguments) that have been deprecated since OIIO 2.0 have been removed.

imagebuf.h

  • The style of ImageBuf constructor that "wraps" a caller-owned memory buffer now has a new, preferred, version that takes a span<> or cspan<> instead of a raw pointer. The old versions is considered deprecated.
  • New span-based versions of get_pixels, set_pixels, setpixel, getpixel, interppixel, interppixel_NDC, interppixel_bicubic, interppixel_bicubic_NDC. These are preferred over the old versions that took raw pointers.

imagebufalgo.h

  • The old versions (deprecated since 2.0) of IBA::compare() and computePixelStats() that took a reference to the CompareResults or PixelStats structure now have deprecation warnings. Use the versions that return the structure instead.
  • The deprecated (often since as far back as 2.0) versions of functions that took raw pointers to color values now have deprecations warnings. Use the versions that take span<> or cspan<> instead. These include versions of: isConstantColor, isConstantChannel, isMonochrome, isConstantChannel, colorconvert, fill, checker, add, sub, absdiff, mul, div, mad, pow, channel_sum, channels, clamp, color_count, color_range_check, render_text.
  • The histogram() function that takes a reference to a result vector (deprecated since 2.0 and previously warned) has been removed. Use the version that returns the vector instead. The histogram_draw() (deprecated since 2.0 and previously warned) has been removed and has no replacement since it was always silly.
  • The versions of ociodisplay that lacked an inverse parameter, which were marked as deprecated since 2.5, now have deprecation warnings. Use the version that takes an inverse bool.
  • The OpenCV-related functions that take old-style IplImage pointers (deprecated since 2.0) have been removed. Use the modern ones that use cv::Mat.
  • The pre-KWArgs versions of resize, warp, and fit now have deprecation warnings. Use the versions that take KWArgs instead.
  • The OpenCV-related functions to_OpenCV(), from_OpenCV(), and capture_image() have moved to the imagebufalgo_opencv.h header.

imagebufalgo_util.h

  • IBA::type_merge, deprecated since 2.3, now has a deprecation warning. Instead, use TypeDesc::basetype_merge().

imagecache.h

  • ImageCache::create() now returns a std::shared_ptr<ImageCache> instead of a raw pointer.

missingmath.h

  • This header has been removed entirely. It has was originally needed for pre-C++11 MSVS, but has been unused since OIIO 2.0 (other than transitively including fmath.h).

paramlist.h

  • Removed some ParamValue constructor variants that have been deprecated since OIIO 2.4. The removed variants took an optional bool parameter indicating whether the value was copied. If you need to override the usual copy behavior, please use the newer variety of constructors that instead use a "strong" type where you pass ParamValue:Copy(bool).

parallel.h

  • Removed several varieties of parallel_for functions where the task functions took a thread ID argument in addition to the range, which have been considered deprecated since OIIO 2.3. Please use task functions that do not take a thread ID parameter.

platform.h

  • Removed macros OIIO_CONSTEXPR, OIIO_CONSTEXPR14, and OIIO_CONSTEXPR_OR_CONST and deprecated OIIO_CONSTEXPR17 (use regular C++ constexpr in place of all of these). Removed macro OIIO_NOEXCEPT (use C++ noexcept).
  • Removed macro OIIO_UNUSED_OK, which had been deprecated since 2.0. Marked OIIO_MAYBE_UNUSED as deprecated as well, now that C++17 is the minimum, there's no reason not to directly use the C++ attribute [[maybe_unused]].

simd.h

  • The old (OIIO 1.x) type names float3, float4, float8, int4, int8, mask4, bool4, bool8 have been removed. Use the new vbool4, vint4, vfloat4, etc.
  • The old rotl32 functions have been removed. They had been deprecated since OIIO 2.1. Please use rotl() intead.
  • The old floori functions have been removed. They had been deprecated since OIIO 1.8. Please use ifloor() instead.
  • The old OIIO_SIMD_HAS_FLOAT8 macro has been removed. It was deprecated since OIIO 1.8.

string_view.h

  • The string_view::c_str() method has been marked as deprecated, since it is not present in C++17 std::string_view. If you must use this functionality (with caution about when it is safe), then use the freestanding OIIO::c_str(string_view) function instead.

strutil.h

  • The default behavior of Strutil::format() has been changed to use the std::format conventions. If you want the old behavior, use Strutil::old::format() instead.
  • Added deprecation warnings to all the old (printf-convention) string format() function.

texture.h

  • TextureSystem::create() now returns a std::shared_ptr<TextureSystem> instead of a raw pointer.
  • Removed stochastic-related tokens from the MipMode and InterpMode enums. These were originally experimental but never removed.
  • Removed the bias field from the TextureOpt structure. This was originally there for the sake of shadow maps, but was never used because we never implemented shadow maps in OIIO's TextureSystem.
  • Removed the TextureOptions, which hasn't been used since OIIO 1.x. We switched to the alternate TextureOpt structure in OIIO 2.0.
  • Fully removed the long-deprecated methods of TextureSystem that operated on batches using the VaryingRef class. These were replaced by alternatives a long time ago.

thread.h

  • OIIO::yield() now has a deprecation warning, having been marked as deprecatd since OIIO 2.4. Use std::this_thread::yield().

tiffutils.h

  • Removed the version of decode_exif that takes a pointer and length (deprecated since 1.8). Use the version that takes a string_view, or the one that takes a cspan<uint8_t>.

type_traits.h

  • Removed the OIIO::void_t template, which now should be replaced with std::void_t.

ustring.h

  • Removed old ustringHash (which was just an alias for std::hash<ustring>, which should be used instead).

varyingref.h

  • This header has been removed completely, since we no longer use the classes it defines.

python bindings

  • The ImageBufAlgo.capture_image() function has been removed from the Python bindings. Python scripts that wish to capture images from live cameras should use OpenCV or other capture APIs of choice and then pass the results to OIIO to construct an ImageBuf.
  • Static type names within the TypeDesc class (such as TypeDesc.TypeFloat) have been removed after being considered deprecated since OIIO 1.8. Use the names in the overall OpenImageIO namespace instead.
  • Older versions of ImageBufAlgo.fit() have been removed. Use the newer function signatures.
  • Older versions of ImageInput::read_native_deep_scanlines() and read_native_deep_tiles() have been removed. They had been deprecated since OIIO 2.0.

maketx

  • The --noresize option has been removed. It was deprecated since OIIO 2.0, when it became the default behavior.
  • The --stats option has been removed. It was deprecated since OIIO 1.6, when it was renamed --runstats.