Add Chromium-only Blender WebEngine parity work

blender-5.2.0/intern/dualcon/dualcon.h

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+/* SPDX-FileCopyrightText: 2011-2022 Blender Authors
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later */
+
+#ifndef __DUALCON_H__
+#define __DUALCON_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef float (*DualConCo)[3];
+
+typedef unsigned int (*DualConTri)[3];
+
+typedef unsigned int *DualConCornerVerts;
+
+typedef struct DualConInput {
+  DualConCornerVerts corner_verts;
+
+  DualConCo co;
+  int co_stride;
+  int totco;
+
+  DualConTri corner_tris;
+  int tri_stride;
+  int tottri;
+
+  int corner_verts_stride;
+
+  float min[3], max[3];
+} DualConInput;
+
+/* callback for allocating memory for output */
+typedef void *(*DualConAllocOutput)(int totvert, int totquad);
+/* callback for adding a new vertex to the output */
+typedef void (*DualConAddVert)(void *output, const float co[3]);
+/* callback for adding a new quad to the output */
+typedef void (*DualConAddQuad)(void *output, const int vert_indices[4]);
+
+typedef enum {
+  DUALCON_FLOOD_FILL = 1,
+} DualConFlags;
+
+typedef enum {
+  /* blocky */
+  DUALCON_CENTROID,
+  /* smooth */
+  DUALCON_MASS_POINT,
+  /* keeps sharp edges */
+  DUALCON_SHARP_FEATURES,
+} DualConMode;
+
+/* Usage:
+ *
+ * The three callback arguments are used for creating the output
+ * mesh. The alloc_output callback takes the total number of vertices
+ * and faces (quads) that will be in the output. It should allocate
+ * and return a structure to hold the output mesh. The add_vert and
+ * add_quad callbacks will then be called for each new vertex and
+ * quad, and the callback should add the new mesh elements to the
+ * structure.
+ */
+void *dualcon(const DualConInput *input_mesh,
+              /* callbacks for output */
+              DualConAllocOutput alloc_output,
+              DualConAddVert add_vert,
+              DualConAddQuad add_quad,
+
+              /* flags and settings to control the remeshing
+               * algorithm */
+              DualConFlags flags,
+              DualConMode mode,
+              float threshold,
+              float hermite_num,
+              float scale,
+              int depth);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __DUALCON_H__ */