From eddffdd3988af768e56243fdffd18813b31b1441 Mon Sep 17 00:00:00 2001
From: Aleksi Juvani <aleksijuvani>
Date: Tue, 29 Mar 2022 20:57:59 -0500
Subject: Cleanup: Move UV edit parameterize code to geometry module

This will allow reusing it elsewhere, such as in a geometry node.

Differential Revision: https://developer.blender.org/D14453
---
 source/blender/geometry/GEO_uv_parametrizer.h | 134 ++++++++++++++++++++++++++
 1 file changed, 134 insertions(+)
 create mode 100644 source/blender/geometry/GEO_uv_parametrizer.h

(limited to 'source/blender/geometry/GEO_uv_parametrizer.h')

diff --git a/source/blender/geometry/GEO_uv_parametrizer.h b/source/blender/geometry/GEO_uv_parametrizer.h
new file mode 100644
index 00000000000..e25889a0923
--- /dev/null
+++ b/source/blender/geometry/GEO_uv_parametrizer.h
@@ -0,0 +1,134 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#pragma once
+
+#include "BLI_sys_types.h" /* for intptr_t support */
+
+/** \file
+ * \ingroup geo
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef void ParamHandle;  /* handle to a set of charts */
+typedef intptr_t ParamKey; /* (hash) key for identifying verts and faces */
+typedef enum ParamBool {
+  PARAM_TRUE = 1,
+  PARAM_FALSE = 0,
+} ParamBool;
+
+/* -------------------------------------------------------------------- */
+/** \name Chart Construction:
+ *
+ * Faces and seams may only be added between #GEO_uv_parametrizer_construct_begin and
+ * #GEO_uv_parametrizer_construct_end.
+ *
+ * The pointers to `co` and `uv` are stored, rather than being copied. Vertices are implicitly
+ * created.
+ *
+ * In #GEO_uv_parametrizer_construct_end the mesh will be split up according to the seams. The
+ * resulting charts must be manifold, connected and open (at least one boundary loop). The output
+ * will be written to the `uv` pointers.
+ *
+ * \{ */
+
+ParamHandle *GEO_uv_parametrizer_construct_begin(void);
+
+void GEO_uv_parametrizer_aspect_ratio(ParamHandle *handle, float aspx, float aspy);
+
+void GEO_uv_parametrizer_face_add(ParamHandle *handle,
+                                  ParamKey key,
+                                  int nverts,
+                                  ParamKey *vkeys,
+                                  float *co[4],
+                                  float *uv[4],
+                                  ParamBool *pin,
+                                  ParamBool *select);
+
+void GEO_uv_parametrizer_edge_set_seam(ParamHandle *handle, ParamKey *vkeys);
+
+void GEO_uv_parametrizer_construct_end(ParamHandle *handle,
+                                       ParamBool fill,
+                                       ParamBool topology_from_uvs,
+                                       int *count_fail);
+void GEO_uv_parametrizer_delete(ParamHandle *handle);
+
+/** \} */
+
+/* -------------------------------------------------------------------- */
+/** \name Least Squares Conformal Maps:
+ *
+ * Charts with less than two pinned vertices are assigned two pins. LSCM is divided to three steps:
+ *
+ * 1. Begin: compute matrix and its factorization (expensive).
+ * 2. Solve using pinned coordinates (cheap).
+ * 3. End: clean up.
+ *
+ * UV coordinates are allowed to change within begin/end, for quick re-solving.
+ *
+ * \{ */
+
+void GEO_uv_parametrizer_lscm_begin(ParamHandle *handle, ParamBool live, ParamBool abf);
+void GEO_uv_parametrizer_lscm_solve(ParamHandle *handle, int *count_changed, int *count_failed);
+void GEO_uv_parametrizer_lscm_end(ParamHandle *handle);
+
+/** \} */
+
+/* -------------------------------------------------------------------- */
+/** \name Stretch
+ * \{ */
+
+void GEO_uv_parametrizer_stretch_begin(ParamHandle *handle);
+void GEO_uv_parametrizer_stretch_blend(ParamHandle *handle, float blend);
+void GEO_uv_parametrizer_stretch_iter(ParamHandle *handle);
+void GEO_uv_parametrizer_stretch_end(ParamHandle *handle);
+
+/** \} */
+
+/* -------------------------------------------------------------------- */
+/** \name Area Smooth
+ * \{ */
+
+void GEO_uv_parametrizer_smooth_area(ParamHandle *handle);
+
+/** \} */
+
+/* -------------------------------------------------------------------- */
+/** \name Packing
+ * \{ */
+
+void GEO_uv_parametrizer_pack(ParamHandle *handle,
+                              float margin,
+                              bool do_rotate,
+                              bool ignore_pinned);
+
+/** \} */
+
+/* -------------------------------------------------------------------- */
+/** \name Average area for all charts
+ * \{ */
+
+void GEO_uv_parametrizer_average(ParamHandle *handle, bool ignore_pinned);
+
+/** \} */
+
+/* -------------------------------------------------------------------- */
+/** \name Simple x,y scale
+ * \{ */
+
+void GEO_uv_parametrizer_scale(ParamHandle *handle, float x, float y);
+
+/* -------------------------------------------------------------------- */
+/** \name Flushing
+ * \{ */
+
+void GEO_uv_parametrizer_flush(ParamHandle *handle);
+void GEO_uv_parametrizer_flush_restore(ParamHandle *handle);
+
+/** \} */
+
+#ifdef __cplusplus
+}
+#endif
-- 
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