Transfer Data: add main core code and operators.

This add code needed to map a CD data layout from source mesh towards destination one,
and code needed to actually transfer data, using BKE's mesh remap generated data.

This allows to transfer most CD layers (vgroups, vcols, uvs...) as well as fake, boolean ones
(like smooth/sharp edges/faces, etc.). Some types are not yet transferable, mainly
shape keys, this is known TODO.

Data transfer can also use some advanced mixing in some cases (mostly, vgroups and vcols).

Notes:
* New transfer operators transfer data from active object towards selected ones.
* Modifier will be committed separately.
* Old weight transfer code (for vgroups) is kept for now, mostly because it is the only
  usable one in weightpaint mode (it transfers from selected object to active one,
  this is not sensible in Object mode, but needed in WeightPaint one). This will be addressed soon.

Again, heavily reviewed and enhanced by Campbell, thanks!

1 files changed, 60 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/data_transfer_intern.h b/source/blender/blenkernel/intern/data_transfer_intern.h
new file mode 100644
index 00000000000..913325afce0
--- /dev/null
+++ b/source/blender/blenkernel/intern/data_transfer_intern.h
@@ -0,0 +1,60 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version. 
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2014 Blender Foundation.
+ * All rights reserved.
+ *
+ * 
+ * Contributor(s): Bastien Montagne
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file blender/blenkernel/intern/data_transfer_intern.h
+ *  \ingroup bke
+ */
+
+#ifndef __DATA_TRANSFER_INTERN_H__
+#define __DATA_TRANSFER_INTERN_H__
+
+struct CustomDataTransferLayerMap;
+struct CustomData;
+struct ListBase;
+
+float data_transfer_interp_float_do(
+        const int mix_mode, const float val_dst, const float val_src, const float mix_factor);
+
+/* Copied from BKE_customdata.h :( */
+typedef void (*cd_datatransfer_interp)(const struct CustomDataTransferLayerMap *laymap, void *dest,
+                                       void **sources, const float *weights, const int count, const float mix_factor);
+
+void data_transfer_layersmapping_add_item(
+        struct ListBase *r_map, const int data_type, const int mix_mode,
+        const float mix_factor, const float *mix_weights,
+        void *data_src, void *data_dst, const int data_src_n, const int data_dst_n,
+        const size_t elem_size, const size_t data_size, const size_t data_offset, const uint64_t data_flag,
+        cd_datatransfer_interp interp);
+
+/* Type-specific. */
+
+bool data_transfer_layersmapping_vgroups(
+        struct ListBase *r_map, const int mix_mode, const float mix_factor, const float *mix_weights,
+        const int num_elem_dst, const bool use_create, const bool use_delete,
+        struct Object *ob_src, struct Object *ob_dst, struct CustomData *cd_src, struct CustomData *cd_dst,
+        const bool use_dupref_dst, const int fromlayers, const int tolayers);
+
+#endif  /* __DATA_TRANSFER_INTERN_H__ */