Cleanup: Split transform conversion of edge and uv to their own files

5 files changed, 452 insertions, 376 deletions

diff --git a/source/blender/editors/transform/CMakeLists.txt b/source/blender/editors/transform/CMakeLists.txt
index afa7b02a1f6..f261fc2ac66 100644
--- a/source/blender/editors/transform/CMakeLists.txt
+++ b/source/blender/editors/transform/CMakeLists.txt
@@ -51,6 +51,8 @@ set(SRC
   transform_convert_mask.c
   transform_convert_mball.c
   transform_convert_mesh.c
+  transform_convert_mesh_edge.c
+  transform_convert_mesh_uv.c
   transform_convert_nla.c
   transform_convert_node.c
   transform_convert_object.c
diff --git a/source/blender/editors/transform/transform_convert.h b/source/blender/editors/transform/transform_convert.h
index 621c923675a..bbf6bfd7f55 100644
--- a/source/blender/editors/transform/transform_convert.h
+++ b/source/blender/editors/transform/transform_convert.h
@@ -74,10 +74,12 @@ void flushTransGraphData(TransInfo *t);
 void flushTransMasking(TransInfo *t);
 
 /* transform_convert_mesh.c */
-void flushTransUVs(TransInfo *t);
 void trans_mesh_customdata_correction_init(TransInfo *t);
 void trans_mesh_customdata_correction_apply(struct TransDataContainer *tc, bool is_final);
 
+/* transform_convert_mesh_uv.c */
+void flushTransUVs(TransInfo *t);
+
 /* transform_convert_node.c */
 void flushTransNodes(TransInfo *t);
 
@@ -141,7 +143,11 @@ void createTransMBallVerts(TransInfo *t);
 
 /* transform_convert_mesh.c */
 void createTransEditVerts(TransInfo *t);
+
+/* transform_convert_mesh_edge.c */
 void createTransEdge(TransInfo *t);
+
+/* transform_convert_mesh_uv.c */
 void createTransUVs(bContext *C, TransInfo *t);
 
 /* transform_convert_nla.c */
diff --git a/source/blender/editors/transform/transform_convert_mesh.c b/source/blender/editors/transform/transform_convert_mesh.c
index 07b2f07bf2c..cddb90cb167 100644
--- a/source/blender/editors/transform/transform_convert_mesh.c
+++ b/source/blender/editors/transform/transform_convert_mesh.c
@@ -23,7 +23,6 @@
 
 #include "DNA_mesh_types.h"
 #include "DNA_meshdata_types.h"
-#include "DNA_space_types.h"
 
 #include "MEM_guardedalloc.h"
 
@@ -37,25 +36,17 @@
 #include "BKE_crazyspace.h"
 #include "BKE_editmesh.h"
 #include "BKE_mesh.h"
-#include "BKE_mesh_mapping.h"
 #include "BKE_modifier.h"
 #include "BKE_scene.h"
 
-#include "ED_image.h"
 #include "ED_mesh.h"
-#include "ED_uvedit.h"
 
-#include "WM_api.h" /* for WM_event_add_notifier to deal with stabilization nodes */
-
-#include "DEG_depsgraph.h"
 #include "DEG_depsgraph_query.h"
 
 #include "transform.h"
 #include "transform_convert.h"
 #include "transform_snap.h"
 
-#include "bmesh.h"
-
 /* Used for both mirror epsilon and TD_MIRROR_EDGE_ */
 #define TRANSFORM_MAXDIST_MIRROR 0.00002f
 
@@ -1311,369 +1302,3 @@ void trans_mesh_customdata_correction_apply(struct TransDataContainer *tc, bool
 }
 
 /** \} */
-
-/* -------------------------------------------------------------------- */
-/** \name Edge (for crease) Transform Creation
- *
- * \{ */
-
-void createTransEdge(TransInfo *t)
-{
-  FOREACH_TRANS_DATA_CONTAINER (t, tc) {
-
-    BMEditMesh *em = BKE_editmesh_from_object(tc->obedit);
-    TransData *td = NULL;
-    BMEdge *eed;
-    BMIter iter;
-    float mtx[3][3], smtx[3][3];
-    int count = 0, countsel = 0;
-    const bool is_prop_edit = (t->flag & T_PROP_EDIT) != 0;
-    int cd_edge_float_offset;
-
-    BM_ITER_MESH (eed, &iter, em->bm, BM_EDGES_OF_MESH) {
-      if (!BM_elem_flag_test(eed, BM_ELEM_HIDDEN)) {
-        if (BM_elem_flag_test(eed, BM_ELEM_SELECT)) {
-          countsel++;
-        }
-        if (is_prop_edit) {
-          count++;
-        }
-      }
-    }
-
-    if (countsel == 0) {
-      tc->data_len = 0;
-      continue;
-    }
-
-    if (is_prop_edit) {
-      tc->data_len = count;
-    }
-    else {
-      tc->data_len = countsel;
-    }
-
-    td = tc->data = MEM_callocN(tc->data_len * sizeof(TransData), "TransCrease");
-
-    copy_m3_m4(mtx, tc->obedit->obmat);
-    pseudoinverse_m3_m3(smtx, mtx, PSEUDOINVERSE_EPSILON);
-
-    /* create data we need */
-    if (t->mode == TFM_BWEIGHT) {
-      BM_mesh_cd_flag_ensure(em->bm, BKE_mesh_from_object(tc->obedit), ME_CDFLAG_EDGE_BWEIGHT);
-      cd_edge_float_offset = CustomData_get_offset(&em->bm->edata, CD_BWEIGHT);
-    }
-    else {  // if (t->mode == TFM_CREASE) {
-      BLI_assert(t->mode == TFM_CREASE);
-      BM_mesh_cd_flag_ensure(em->bm, BKE_mesh_from_object(tc->obedit), ME_CDFLAG_EDGE_CREASE);
-      cd_edge_float_offset = CustomData_get_offset(&em->bm->edata, CD_CREASE);
-    }
-
-    BLI_assert(cd_edge_float_offset != -1);
-
-    BM_ITER_MESH (eed, &iter, em->bm, BM_EDGES_OF_MESH) {
-      if (!BM_elem_flag_test(eed, BM_ELEM_HIDDEN) &&
-          (BM_elem_flag_test(eed, BM_ELEM_SELECT) || is_prop_edit)) {
-        float *fl_ptr;
-        /* need to set center for center calculations */
-        mid_v3_v3v3(td->center, eed->v1->co, eed->v2->co);
-
-        td->loc = NULL;
-        if (BM_elem_flag_test(eed, BM_ELEM_SELECT)) {
-          td->flag = TD_SELECTED;
-        }
-        else {
-          td->flag = 0;
-        }
-
-        copy_m3_m3(td->smtx, smtx);
-        copy_m3_m3(td->mtx, mtx);
-
-        td->ext = NULL;
-
-        fl_ptr = BM_ELEM_CD_GET_VOID_P(eed, cd_edge_float_offset);
-        td->val = fl_ptr;
-        td->ival = *fl_ptr;
-
-        td++;
-      }
-    }
-  }
-}
-
-/** \} */
-
-/* -------------------------------------------------------------------- */
-/** \name UVs Transform Creation
- *
- * \{ */
-
-static void UVsToTransData(const float aspect[2],
-                           TransData *td,
-                           TransData2D *td2d,
-                           float *uv,
-                           const float *center,
-                           bool selected)
-{
-  /* uv coords are scaled by aspects. this is needed for rotations and
-   * proportional editing to be consistent with the stretched uv coords
-   * that are displayed. this also means that for display and numinput,
-   * and when the uv coords are flushed, these are converted each time */
-  td2d->loc[0] = uv[0] * aspect[0];
-  td2d->loc[1] = uv[1] * aspect[1];
-  td2d->loc[2] = 0.0f;
-  td2d->loc2d = uv;
-
-  td->flag = 0;
-  td->loc = td2d->loc;
-  copy_v2_v2(td->center, center ? center : td->loc);
-  td->center[2] = 0.0f;
-  copy_v3_v3(td->iloc, td->loc);
-
-  memset(td->axismtx, 0, sizeof(td->axismtx));
-  td->axismtx[2][2] = 1.0f;
-
-  td->ext = NULL;
-  td->val = NULL;
-
-  if (selected) {
-    td->flag |= TD_SELECTED;
-    td->dist = 0.0;
-  }
-  else {
-    td->dist = FLT_MAX;
-  }
-  unit_m3(td->mtx);
-  unit_m3(td->smtx);
-}
-
-void createTransUVs(bContext *C, TransInfo *t)
-{
-  SpaceImage *sima = CTX_wm_space_image(C);
-  Scene *scene = t->scene;
-  ToolSettings *ts = CTX_data_tool_settings(C);
-
-  const bool is_prop_edit = (t->flag & T_PROP_EDIT) != 0;
-  const bool is_prop_connected = (t->flag & T_PROP_CONNECTED) != 0;
-  const bool is_island_center = (t->around == V3D_AROUND_LOCAL_ORIGINS);
-
-  FOREACH_TRANS_DATA_CONTAINER (t, tc) {
-
-    TransData *td = NULL;
-    TransData2D *td2d = NULL;
-    BMEditMesh *em = BKE_editmesh_from_object(tc->obedit);
-    BMFace *efa;
-    BMIter iter, liter;
-    UvElementMap *elementmap = NULL;
-    BLI_bitmap *island_enabled = NULL;
-    struct {
-      float co[2];
-      int co_num;
-    } *island_center = NULL;
-    int count = 0, countsel = 0, count_rejected = 0;
-    const int cd_loop_uv_offset = CustomData_get_offset(&em->bm->ldata, CD_MLOOPUV);
-
-    if (!ED_space_image_show_uvedit(sima, tc->obedit)) {
-      continue;
-    }
-
-    /* count */
-    if (is_prop_connected || is_island_center) {
-      /* create element map with island information */
-      const bool use_facesel = (ts->uv_flag & UV_SYNC_SELECTION) == 0;
-      const bool use_uvsel = !is_prop_connected;
-      elementmap = BM_uv_element_map_create(em->bm, scene, use_facesel, use_uvsel, false, true);
-      if (elementmap == NULL) {
-        continue;
-      }
-
-      if (is_prop_connected) {
-        island_enabled = BLI_BITMAP_NEW(elementmap->totalIslands, "TransIslandData(UV Editing)");
-      }
-
-      if (is_island_center) {
-        island_center = MEM_callocN(sizeof(*island_center) * elementmap->totalIslands, __func__);
-      }
-    }
-
-    BM_ITER_MESH (efa, &iter, em->bm, BM_FACES_OF_MESH) {
-      BMLoop *l;
-
-      if (!uvedit_face_visible_test(scene, efa)) {
-        BM_elem_flag_disable(efa, BM_ELEM_TAG);
-        continue;
-      }
-
-      BM_elem_flag_enable(efa, BM_ELEM_TAG);
-      BM_ITER_ELEM (l, &liter, efa, BM_LOOPS_OF_FACE) {
-        if (uvedit_uv_select_test(scene, l, cd_loop_uv_offset)) {
-          countsel++;
-
-          if (is_prop_connected || island_center) {
-            UvElement *element = BM_uv_element_get(elementmap, efa, l);
-
-            if (is_prop_connected) {
-              BLI_BITMAP_ENABLE(island_enabled, element->island);
-            }
-
-            if (is_island_center) {
-              if (element->flag == false) {
-                MLoopUV *luv = BM_ELEM_CD_GET_VOID_P(l, cd_loop_uv_offset);
-                add_v2_v2(island_center[element->island].co, luv->uv);
-                island_center[element->island].co_num++;
-                element->flag = true;
-              }
-            }
-          }
-        }
-
-        if (is_prop_edit) {
-          count++;
-        }
-      }
-    }
-
-    /* note: in prop mode we need at least 1 selected */
-    if (countsel == 0) {
-      goto finally;
-    }
-
-    if (is_island_center) {
-      int i;
-
-      for (i = 0; i < elementmap->totalIslands; i++) {
-        mul_v2_fl(island_center[i].co, 1.0f / island_center[i].co_num);
-        mul_v2_v2(island_center[i].co, t->aspect);
-      }
-    }
-
-    tc->data_len = (is_prop_edit) ? count : countsel;
-    tc->data = MEM_callocN(tc->data_len * sizeof(TransData), "TransObData(UV Editing)");
-    /* for each 2d uv coord a 3d vector is allocated, so that they can be
-     * treated just as if they were 3d verts */
-    tc->data_2d = MEM_callocN(tc->data_len * sizeof(TransData2D), "TransObData2D(UV Editing)");
-
-    if (sima->flag & SI_CLIP_UV) {
-      t->flag |= T_CLIP_UV;
-    }
-
-    td = tc->data;
-    td2d = tc->data_2d;
-
-    BM_ITER_MESH (efa, &iter, em->bm, BM_FACES_OF_MESH) {
-      BMLoop *l;
-
-      if (!BM_elem_flag_test(efa, BM_ELEM_TAG)) {
-        continue;
-      }
-
-      BM_ITER_ELEM (l, &liter, efa, BM_LOOPS_OF_FACE) {
-        const bool selected = uvedit_uv_select_test(scene, l, cd_loop_uv_offset);
-        MLoopUV *luv;
-        const float *center = NULL;
-
-        if (!is_prop_edit && !selected) {
-          continue;
-        }
-
-        if (is_prop_connected || is_island_center) {
-          UvElement *element = BM_uv_element_get(elementmap, efa, l);
-          if (element) {
-            if (is_prop_connected) {
-              if (!BLI_BITMAP_TEST(island_enabled, element->island)) {
-                count_rejected++;
-                continue;
-              }
-            }
-
-            if (is_island_center) {
-              center = island_center[element->island].co;
-            }
-          }
-        }
-
-        BM_elem_flag_enable(l, BM_ELEM_TAG);
-        luv = BM_ELEM_CD_GET_VOID_P(l, cd_loop_uv_offset);
-        UVsToTransData(t->aspect, td++, td2d++, luv->uv, center, selected);
-      }
-    }
-
-    if (is_prop_connected) {
-      tc->data_len -= count_rejected;
-    }
-
-    if (sima->flag & SI_LIVE_UNWRAP) {
-      ED_uvedit_live_unwrap_begin(t->scene, tc->obedit);
-    }
-
-  finally:
-    if (is_prop_connected || is_island_center) {
-      BM_uv_element_map_free(elementmap);
-
-      if (is_prop_connected) {
-        MEM_freeN(island_enabled);
-      }
-
-      if (island_center) {
-        MEM_freeN(island_center);
-      }
-    }
-  }
-}
-
-/** \} */
-
-/* -------------------------------------------------------------------- */
-/** \name UVs Transform Flush
- *
- * \{ */
-
-void flushTransUVs(TransInfo *t)
-{
-  SpaceImage *sima = t->area->spacedata.first;
-  const bool use_pixel_snap = ((sima->pixel_snap_mode != SI_PIXEL_SNAP_DISABLED) &&
-                               (t->state != TRANS_CANCEL));
-
-  FOREACH_TRANS_DATA_CONTAINER (t, tc) {
-    TransData2D *td;
-    int a;
-    float aspect_inv[2], size[2];
-
-    aspect_inv[0] = 1.0f / t->aspect[0];
-    aspect_inv[1] = 1.0f / t->aspect[1];
-
-    if (use_pixel_snap) {
-      int size_i[2];
-      ED_space_image_get_size(sima, &size_i[0], &size_i[1]);
-      size[0] = size_i[0];
-      size[1] = size_i[1];
-    }
-
-    /* flush to 2d vector from internally used 3d vector */
-    for (a = 0, td = tc->data_2d; a < tc->data_len; a++, td++) {
-      td->loc2d[0] = td->loc[0] * aspect_inv[0];
-      td->loc2d[1] = td->loc[1] * aspect_inv[1];
-
-      if (use_pixel_snap) {
-        td->loc2d[0] *= size[0];
-        td->loc2d[1] *= size[1];
-
-        switch (sima->pixel_snap_mode) {
-          case SI_PIXEL_SNAP_CENTER:
-            td->loc2d[0] = roundf(td->loc2d[0] - 0.5f) + 0.5f;
-            td->loc2d[1] = roundf(td->loc2d[1] - 0.5f) + 0.5f;
-            break;
-          case SI_PIXEL_SNAP_CORNER:
-            td->loc2d[0] = roundf(td->loc2d[0]);
-            td->loc2d[1] = roundf(td->loc2d[1]);
-            break;
-        }
-
-        td->loc2d[0] /= size[0];
-        td->loc2d[1] /= size[1];
-      }
-    }
-  }
-}
-
-/** \} */
diff --git a/source/blender/editors/transform/transform_convert_mesh_edge.c b/source/blender/editors/transform/transform_convert_mesh_edge.c
new file mode 100644
index 00000000000..de90c515042
--- /dev/null
+++ b/source/blender/editors/transform/transform_convert_mesh_edge.c
@@ -0,0 +1,126 @@
+/*
+ * 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) 2001-2002 by NaN Holding BV.
+ * All rights reserved.
+ */
+
+/** \file
+ * \ingroup edtransform
+ */
+
+#include "DNA_mesh_types.h"
+
+#include "MEM_guardedalloc.h"
+
+#include "BLI_math.h"
+
+#include "BKE_context.h"
+#include "BKE_editmesh.h"
+#include "BKE_mesh.h"
+
+#include "transform.h"
+#include "transform_convert.h"
+
+/* -------------------------------------------------------------------- */
+/** \name Edge (for crease) Transform Creation
+ *
+ * \{ */
+
+void createTransEdge(TransInfo *t)
+{
+  FOREACH_TRANS_DATA_CONTAINER (t, tc) {
+
+    BMEditMesh *em = BKE_editmesh_from_object(tc->obedit);
+    TransData *td = NULL;
+    BMEdge *eed;
+    BMIter iter;
+    float mtx[3][3], smtx[3][3];
+    int count = 0, countsel = 0;
+    const bool is_prop_edit = (t->flag & T_PROP_EDIT) != 0;
+    int cd_edge_float_offset;
+
+    BM_ITER_MESH (eed, &iter, em->bm, BM_EDGES_OF_MESH) {
+      if (!BM_elem_flag_test(eed, BM_ELEM_HIDDEN)) {
+        if (BM_elem_flag_test(eed, BM_ELEM_SELECT)) {
+          countsel++;
+        }
+        if (is_prop_edit) {
+          count++;
+        }
+      }
+    }
+
+    if (countsel == 0) {
+      tc->data_len = 0;
+      continue;
+    }
+
+    if (is_prop_edit) {
+      tc->data_len = count;
+    }
+    else {
+      tc->data_len = countsel;
+    }
+
+    td = tc->data = MEM_callocN(tc->data_len * sizeof(TransData), "TransCrease");
+
+    copy_m3_m4(mtx, tc->obedit->obmat);
+    pseudoinverse_m3_m3(smtx, mtx, PSEUDOINVERSE_EPSILON);
+
+    /* create data we need */
+    if (t->mode == TFM_BWEIGHT) {
+      BM_mesh_cd_flag_ensure(em->bm, BKE_mesh_from_object(tc->obedit), ME_CDFLAG_EDGE_BWEIGHT);
+      cd_edge_float_offset = CustomData_get_offset(&em->bm->edata, CD_BWEIGHT);
+    }
+    else {  // if (t->mode == TFM_CREASE) {
+      BLI_assert(t->mode == TFM_CREASE);
+      BM_mesh_cd_flag_ensure(em->bm, BKE_mesh_from_object(tc->obedit), ME_CDFLAG_EDGE_CREASE);
+      cd_edge_float_offset = CustomData_get_offset(&em->bm->edata, CD_CREASE);
+    }
+
+    BLI_assert(cd_edge_float_offset != -1);
+
+    BM_ITER_MESH (eed, &iter, em->bm, BM_EDGES_OF_MESH) {
+      if (!BM_elem_flag_test(eed, BM_ELEM_HIDDEN) &&
+          (BM_elem_flag_test(eed, BM_ELEM_SELECT) || is_prop_edit)) {
+        float *fl_ptr;
+        /* need to set center for center calculations */
+        mid_v3_v3v3(td->center, eed->v1->co, eed->v2->co);
+
+        td->loc = NULL;
+        if (BM_elem_flag_test(eed, BM_ELEM_SELECT)) {
+          td->flag = TD_SELECTED;
+        }
+        else {
+          td->flag = 0;
+        }
+
+        copy_m3_m3(td->smtx, smtx);
+        copy_m3_m3(td->mtx, mtx);
+
+        td->ext = NULL;
+
+        fl_ptr = BM_ELEM_CD_GET_VOID_P(eed, cd_edge_float_offset);
+        td->val = fl_ptr;
+        td->ival = *fl_ptr;
+
+        td++;
+      }
+    }
+  }
+}
+
+/** \} */
diff --git a/source/blender/editors/transform/transform_convert_mesh_uv.c b/source/blender/editors/transform/transform_convert_mesh_uv.c
new file mode 100644
index 00000000000..5328bac7f79
--- /dev/null
+++ b/source/blender/editors/transform/transform_convert_mesh_uv.c
@@ -0,0 +1,317 @@
+/*
+ * 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) 2001-2002 by NaN Holding BV.
+ * All rights reserved.
+ */
+
+/** \file
+ * \ingroup edtransform
+ */
+
+#include "DNA_meshdata_types.h"
+
+#include "MEM_guardedalloc.h"
+
+#include "BLI_bitmap.h"
+#include "BLI_math.h"
+
+#include "BKE_context.h"
+#include "BKE_editmesh.h"
+#include "BKE_mesh_mapping.h"
+
+#include "ED_image.h"
+#include "ED_mesh.h"
+#include "ED_uvedit.h"
+
+#include "WM_api.h" /* for WM_event_add_notifier to deal with stabilization nodes */
+
+#include "transform.h"
+#include "transform_convert.h"
+
+/* -------------------------------------------------------------------- */
+/** \name UVs Transform Creation
+ *
+ * \{ */
+
+static void UVsToTransData(const float aspect[2],
+                           TransData *td,
+                           TransData2D *td2d,
+                           float *uv,
+                           const float *center,
+                           bool selected)
+{
+  /* uv coords are scaled by aspects. this is needed for rotations and
+   * proportional editing to be consistent with the stretched uv coords
+   * that are displayed. this also means that for display and numinput,
+   * and when the uv coords are flushed, these are converted each time */
+  td2d->loc[0] = uv[0] * aspect[0];
+  td2d->loc[1] = uv[1] * aspect[1];
+  td2d->loc[2] = 0.0f;
+  td2d->loc2d = uv;
+
+  td->flag = 0;
+  td->loc = td2d->loc;
+  copy_v2_v2(td->center, center ? center : td->loc);
+  td->center[2] = 0.0f;
+  copy_v3_v3(td->iloc, td->loc);
+
+  memset(td->axismtx, 0, sizeof(td->axismtx));
+  td->axismtx[2][2] = 1.0f;
+
+  td->ext = NULL;
+  td->val = NULL;
+
+  if (selected) {
+    td->flag |= TD_SELECTED;
+    td->dist = 0.0;
+  }
+  else {
+    td->dist = FLT_MAX;
+  }
+  unit_m3(td->mtx);
+  unit_m3(td->smtx);
+}
+
+void createTransUVs(bContext *C, TransInfo *t)
+{
+  SpaceImage *sima = CTX_wm_space_image(C);
+  Scene *scene = t->scene;
+  ToolSettings *ts = CTX_data_tool_settings(C);
+
+  const bool is_prop_edit = (t->flag & T_PROP_EDIT) != 0;
+  const bool is_prop_connected = (t->flag & T_PROP_CONNECTED) != 0;
+  const bool is_island_center = (t->around == V3D_AROUND_LOCAL_ORIGINS);
+
+  FOREACH_TRANS_DATA_CONTAINER (t, tc) {
+
+    TransData *td = NULL;
+    TransData2D *td2d = NULL;
+    BMEditMesh *em = BKE_editmesh_from_object(tc->obedit);
+    BMFace *efa;
+    BMIter iter, liter;
+    UvElementMap *elementmap = NULL;
+    BLI_bitmap *island_enabled = NULL;
+    struct {
+      float co[2];
+      int co_num;
+    } *island_center = NULL;
+    int count = 0, countsel = 0, count_rejected = 0;
+    const int cd_loop_uv_offset = CustomData_get_offset(&em->bm->ldata, CD_MLOOPUV);
+
+    if (!ED_space_image_show_uvedit(sima, tc->obedit)) {
+      continue;
+    }
+
+    /* count */
+    if (is_prop_connected || is_island_center) {
+      /* create element map with island information */
+      const bool use_facesel = (ts->uv_flag & UV_SYNC_SELECTION) == 0;
+      const bool use_uvsel = !is_prop_connected;
+      elementmap = BM_uv_element_map_create(em->bm, scene, use_facesel, use_uvsel, false, true);
+      if (elementmap == NULL) {
+        continue;
+      }
+
+      if (is_prop_connected) {
+        island_enabled = BLI_BITMAP_NEW(elementmap->totalIslands, "TransIslandData(UV Editing)");
+      }
+
+      if (is_island_center) {
+        island_center = MEM_callocN(sizeof(*island_center) * elementmap->totalIslands, __func__);
+      }
+    }
+
+    BM_ITER_MESH (efa, &iter, em->bm, BM_FACES_OF_MESH) {
+      BMLoop *l;
+
+      if (!uvedit_face_visible_test(scene, efa)) {
+        BM_elem_flag_disable(efa, BM_ELEM_TAG);
+        continue;
+      }
+
+      BM_elem_flag_enable(efa, BM_ELEM_TAG);
+      BM_ITER_ELEM (l, &liter, efa, BM_LOOPS_OF_FACE) {
+        if (uvedit_uv_select_test(scene, l, cd_loop_uv_offset)) {
+          countsel++;
+
+          if (is_prop_connected || island_center) {
+            UvElement *element = BM_uv_element_get(elementmap, efa, l);
+
+            if (is_prop_connected) {
+              BLI_BITMAP_ENABLE(island_enabled, element->island);
+            }
+
+            if (is_island_center) {
+              if (element->flag == false) {
+                MLoopUV *luv = BM_ELEM_CD_GET_VOID_P(l, cd_loop_uv_offset);
+                add_v2_v2(island_center[element->island].co, luv->uv);
+                island_center[element->island].co_num++;
+                element->flag = true;
+              }
+            }
+          }
+        }
+
+        if (is_prop_edit) {
+          count++;
+        }
+      }
+    }
+
+    /* note: in prop mode we need at least 1 selected */
+    if (countsel == 0) {
+      goto finally;
+    }
+
+    if (is_island_center) {
+      int i;
+
+      for (i = 0; i < elementmap->totalIslands; i++) {
+        mul_v2_fl(island_center[i].co, 1.0f / island_center[i].co_num);
+        mul_v2_v2(island_center[i].co, t->aspect);
+      }
+    }
+
+    tc->data_len = (is_prop_edit) ? count : countsel;
+    tc->data = MEM_callocN(tc->data_len * sizeof(TransData), "TransObData(UV Editing)");
+    /* for each 2d uv coord a 3d vector is allocated, so that they can be
+     * treated just as if they were 3d verts */
+    tc->data_2d = MEM_callocN(tc->data_len * sizeof(TransData2D), "TransObData2D(UV Editing)");
+
+    if (sima->flag & SI_CLIP_UV) {
+      t->flag |= T_CLIP_UV;
+    }
+
+    td = tc->data;
+    td2d = tc->data_2d;
+
+    BM_ITER_MESH (efa, &iter, em->bm, BM_FACES_OF_MESH) {
+      BMLoop *l;
+
+      if (!BM_elem_flag_test(efa, BM_ELEM_TAG)) {
+        continue;
+      }
+
+      BM_ITER_ELEM (l, &liter, efa, BM_LOOPS_OF_FACE) {
+        const bool selected = uvedit_uv_select_test(scene, l, cd_loop_uv_offset);
+        MLoopUV *luv;
+        const float *center = NULL;
+
+        if (!is_prop_edit && !selected) {
+          continue;
+        }
+
+        if (is_prop_connected || is_island_center) {
+          UvElement *element = BM_uv_element_get(elementmap, efa, l);
+          if (element) {
+            if (is_prop_connected) {
+              if (!BLI_BITMAP_TEST(island_enabled, element->island)) {
+                count_rejected++;
+                continue;
+              }
+            }
+
+            if (is_island_center) {
+              center = island_center[element->island].co;
+            }
+          }
+        }
+
+        BM_elem_flag_enable(l, BM_ELEM_TAG);
+        luv = BM_ELEM_CD_GET_VOID_P(l, cd_loop_uv_offset);
+        UVsToTransData(t->aspect, td++, td2d++, luv->uv, center, selected);
+      }
+    }
+
+    if (is_prop_connected) {
+      tc->data_len -= count_rejected;
+    }
+
+    if (sima->flag & SI_LIVE_UNWRAP) {
+      ED_uvedit_live_unwrap_begin(t->scene, tc->obedit);
+    }
+
+  finally:
+    if (is_prop_connected || is_island_center) {
+      BM_uv_element_map_free(elementmap);
+
+      if (is_prop_connected) {
+        MEM_freeN(island_enabled);
+      }
+
+      if (island_center) {
+        MEM_freeN(island_center);
+      }
+    }
+  }
+}
+
+/** \} */
+
+/* -------------------------------------------------------------------- */
+/** \name UVs Transform Flush
+ *
+ * \{ */
+
+void flushTransUVs(TransInfo *t)
+{
+  SpaceImage *sima = t->area->spacedata.first;
+  const bool use_pixel_snap = ((sima->pixel_snap_mode != SI_PIXEL_SNAP_DISABLED) &&
+                               (t->state != TRANS_CANCEL));
+
+  FOREACH_TRANS_DATA_CONTAINER (t, tc) {
+    TransData2D *td;
+    int a;
+    float aspect_inv[2], size[2];
+
+    aspect_inv[0] = 1.0f / t->aspect[0];
+    aspect_inv[1] = 1.0f / t->aspect[1];
+
+    if (use_pixel_snap) {
+      int size_i[2];
+      ED_space_image_get_size(sima, &size_i[0], &size_i[1]);
+      size[0] = size_i[0];
+      size[1] = size_i[1];
+    }
+
+    /* flush to 2d vector from internally used 3d vector */
+    for (a = 0, td = tc->data_2d; a < tc->data_len; a++, td++) {
+      td->loc2d[0] = td->loc[0] * aspect_inv[0];
+      td->loc2d[1] = td->loc[1] * aspect_inv[1];
+
+      if (use_pixel_snap) {
+        td->loc2d[0] *= size[0];
+        td->loc2d[1] *= size[1];
+
+        switch (sima->pixel_snap_mode) {
+          case SI_PIXEL_SNAP_CENTER:
+            td->loc2d[0] = roundf(td->loc2d[0] - 0.5f) + 0.5f;
+            td->loc2d[1] = roundf(td->loc2d[1] - 0.5f) + 0.5f;
+            break;
+          case SI_PIXEL_SNAP_CORNER:
+            td->loc2d[0] = roundf(td->loc2d[0]);
+            td->loc2d[1] = roundf(td->loc2d[1]);
+            break;
+        }
+
+        td->loc2d[0] /= size[0];
+        td->loc2d[1] /= size[1];
+      }
+    }
+  }
+}
+
+/** \} */