62 lines
2.2 KiB
C
62 lines
2.2 KiB
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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#ifdef __cplusplus
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extern "C" {
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#endif
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struct Heap;
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struct MemArena;
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/**
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* The intention is that this calculates the output of #BLI_polyfill_calc
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* \note assumes the \a coords form a boundary,
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* so any edges running along contiguous (wrapped) indices,
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* are ignored since the edges won't share 2 faces.
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*/
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void BLI_polyfill_beautify(const float (*coords)[2],
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unsigned int coords_num,
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unsigned int (*tris)[3],
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/* structs for reuse */
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struct MemArena *arena,
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struct Heap *eheap);
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/**
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* Assuming we have 2 triangles sharing an edge (2 - 4),
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* check if the edge running from (1 - 3) gives better results.
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*
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* \param lock_degenerate: Use to avoid rotating out of a degenerate state:
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* - When true, an existing zero area face on either side of the (2 - 4
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* split will return a positive value.
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* - When false, the check must be non-biased towards either split direction.
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* \param r_area: Return the area of the quad,
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* This can be useful when comparing the return value with near zero epsilons.
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* In this case the epsilon can be scaled by the area to avoid the return value
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* of very large faces not having a reliable way to detect near-zero output.
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*
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* \return (negative number means the edge can be rotated, lager == better).
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*/
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float BLI_polyfill_beautify_quad_rotate_calc_ex(const float v1[2],
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const float v2[2],
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const float v3[2],
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const float v4[2],
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bool lock_degenerate,
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float *r_area);
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#define BLI_polyfill_beautify_quad_rotate_calc(v1, v2, v3, v4) \
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BLI_polyfill_beautify_quad_rotate_calc_ex(v1, v2, v3, v4, false, NULL)
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/* avoid realloc's when creating new structures for polyfill ngons */
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#define BLI_POLYFILL_ALLOC_NGON_RESERVE 64
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#ifdef __cplusplus
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}
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#endif
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