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Part of a wider set of changes to migrate UV packing from
uv_parametrizer.cc to uvedit_islands.cc.
This allows UV packing improvements including margin calculation,
correctness fixes such as support for non-manifold geometry,
and new packing algorithms including speed and quality improvements.
See for example c2256bf7f714, T82637
This change migrates UV.unwrap and Live UV Unwrap.
Differential Revision: https://developer.blender.org/D16296
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Affects paint.add_simple_uvs
No user visible changes.
Differential Revision: https://developer.blender.org/D16231
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A refactor of the margin calculation of UV packing, in anticipation
of multiple packing methods soon becoming available.
Three margin scaling methods are now available:
* "Add", Simple method, just add the margin. [0]
(The default margin scale from Blender 2.8 and earlier.)
* "Scaled", Use scale of existing UVs to multiply margin.
(The default from Blender 3.3+)
* "Fraction", a new (slow) method to precisely specify
a fraction of the UV unit square for margin. [1]
The "fraction" code path implements a novel combined search / secant
root finding method which exploits domain knowledge to accelerate
convergence while remaining robust against bad input.
[0]: Resolves T85978
[1]: Resolves T90782
Differential Revision: https://developer.blender.org/D16121
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Also remove unnecessary struct keywords in C++ files.
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Refactor ahead of upcoming packing changes.
Differential Revision: https://developer.blender.org/D16096
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Some changes missed from f68cfd6bb078482c4a779a6e26a56e2734edb5b8.
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Does not compile on Windows.
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Differential Revision: https://developer.blender.org/D15870
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