Campbell Barton
e955c94ed3
Listing the "Blender Foundation" as copyright holder implied the Blender Foundation holds copyright to files which may include work from many developers. While keeping copyright on headers makes sense for isolated libraries, Blender's own code may be refactored or moved between files in a way that makes the per file copyright holders less meaningful. Copyright references to the "Blender Foundation" have been replaced with "Blender Authors", with the exception of `./extern/` since these this contains libraries which are more isolated, any changed to license headers there can be handled on a case-by-case basis. Some directories in `./intern/` have also been excluded: - `./intern/cycles/` it's own `AUTHORS` file is planned. - `./intern/opensubdiv/`. An "AUTHORS" file has been added, using the chromium projects authors file as a template. Design task: #110784 Ref !110783.
32 lines
958 B
C
32 lines
958 B
C
/* SPDX-FileCopyrightText: 2023 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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#pragma once
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/** \file
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* \ingroup bli
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*
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* General looping helpers, use `BLI_FOREACH` prefix.
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*/
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/**
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* Even value distribution.
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*
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* \a src must be larger than \a dst,
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* \a dst defines the number of iterations, their values are evenly spaced.
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*
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* The following pairs represent (src, dst) arguments and the values they loop over.
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* <pre>
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* (19, 4) -> [2, 7, 11. 16]
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* (100, 5) -> [9, 29, 49, 69, 89]
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* (100, 3) -> [16, 49, 83]
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* (100, 100) -> [0..99]
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* </pre>
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* \note this is mainly useful for numbers that might not divide evenly into each other.
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*/
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#define BLI_FOREACH_SPARSE_RANGE(src, dst, i) \
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for (int _src = (src), _src2 = _src * 2, _dst2 = (dst)*2, _error = _dst2 - _src, i = 0, _delta; \
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((void)(_delta = divide_floor_i(_error, _dst2)), (void)(i -= _delta), (i < _src)); \
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_error -= (_delta * _dst2) + _src2)
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