node_gizmo.c

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/*
 * 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.
 */
 
#include <math.h>
 
#include "BLI_math_matrix.h"
#include "BLI_math_vector.h"
#include "BLI_rect.h"
#include "BLI_utildefines.h"
 
#include "BKE_context.h"
#include "BKE_image.h"
#include "BKE_main.h"
 
#include "ED_gizmo_library.h"
#include "ED_screen.h"
 
#include "IMB_imbuf_types.h"
 
#include "MEM_guardedalloc.h"
 
#include "RNA_access.h"
 
#include "WM_api.h"
#include "WM_types.h"
 
#include "node_intern.h"
 
/* -------------------------------------------------------------------- */
static void node_gizmo_calc_matrix_space(const SpaceNode *snode,
                                         const ARegion *region,
                                         float matrix_space[4][4])
{
  unit_m4(matrix_space);
  mul_v3_fl(matrix_space[0], snode->zoom);
  mul_v3_fl(matrix_space[1], snode->zoom);
  matrix_space[3][0] = (region->winx / 2) + snode->xof;
  matrix_space[3][1] = (region->winy / 2) + snode->yof;
}
 
static void node_gizmo_calc_matrix_space_with_image_dims(const SpaceNode *snode,
                                                         const ARegion *region,
                                                         const float image_dims[2],
                                                         float matrix_space[4][4])
{
  unit_m4(matrix_space);
  mul_v3_fl(matrix_space[0], snode->zoom * image_dims[0]);
  mul_v3_fl(matrix_space[1], snode->zoom * image_dims[1]);
  matrix_space[3][0] = ((region->winx / 2) + snode->xof) - ((image_dims[0] / 2.0f) * snode->zoom);
  matrix_space[3][1] = ((region->winy / 2) + snode->yof) - ((image_dims[1] / 2.0f) * snode->zoom);
}
 
/* -------------------------------------------------------------------- */
static void gizmo_node_backdrop_prop_matrix_get(const wmGizmo *UNUSED(gz),
                                                wmGizmoProperty *gz_prop,
                                                void *value_p)
{
  float(*matrix)[4] = value_p;
  BLI_assert(gz_prop->type->array_length == 16);
  const SpaceNode *snode = gz_prop->custom_func.user_data;
  matrix[0][0] = snode->zoom;
  matrix[1][1] = snode->zoom;
  matrix[3][0] = snode->xof;
  matrix[3][1] = snode->yof;
}
 
static void gizmo_node_backdrop_prop_matrix_set(const wmGizmo *UNUSED(gz),
                                                wmGizmoProperty *gz_prop,
                                                const void *value_p)
{
  const float(*matrix)[4] = value_p;
  BLI_assert(gz_prop->type->array_length == 16);
  SpaceNode *snode = gz_prop->custom_func.user_data;
  snode->zoom = matrix[0][0];
  snode->zoom = matrix[1][1];
  snode->xof = matrix[3][0];
  snode->yof = matrix[3][1];
}
 
static bool WIDGETGROUP_node_transform_poll(const bContext *C, wmGizmoGroupType *UNUSED(gzgt))
{
  SpaceNode *snode = CTX_wm_space_node(C);
 
  if ((snode->flag & SNODE_BACKDRAW) == 0) {
    return false;
  }
 
  if (snode && snode->edittree && snode->edittree->type == NTREE_COMPOSIT) {
    bNode *node = nodeGetActive(snode->edittree);
 
    if (node && ELEM(node->type, CMP_NODE_VIEWER, CMP_NODE_SPLITVIEWER)) {
      return true;
    }
  }
 
  return false;
}
 
static void WIDGETGROUP_node_transform_setup(const bContext *UNUSED(C), wmGizmoGroup *gzgroup)
{
  wmGizmoWrapper *wwrapper = MEM_mallocN(sizeof(wmGizmoWrapper), __func__);
 
  wwrapper->gizmo = WM_gizmo_new("GIZMO_GT_cage_2d", gzgroup, NULL);
 
  RNA_enum_set(wwrapper->gizmo->ptr,
               "transform",
               ED_GIZMO_CAGE2D_XFORM_FLAG_TRANSLATE | ED_GIZMO_CAGE2D_XFORM_FLAG_SCALE_UNIFORM);
 
  gzgroup->customdata = wwrapper;
}
 
static void WIDGETGROUP_node_transform_refresh(const bContext *C, wmGizmoGroup *gzgroup)
{
  Main *bmain = CTX_data_main(C);
  wmGizmo *cage = ((wmGizmoWrapper *)gzgroup->customdata)->gizmo;
  const ARegion *region = CTX_wm_region(C);
  /* center is always at the origin */
  const float origin[3] = {region->winx / 2, region->winy / 2};
 
  void *lock;
  Image *ima = BKE_image_ensure_viewer(bmain, IMA_TYPE_COMPOSITE, "Viewer Node");
  ImBuf *ibuf = BKE_image_acquire_ibuf(ima, NULL, &lock);
 
  if (ibuf) {
    const float dims[2] = {
        (ibuf->x > 0) ? ibuf->x : 64.0f,
        (ibuf->y > 0) ? ibuf->y : 64.0f,
    };
 
    RNA_float_set_array(cage->ptr, "dimensions", dims);
    WM_gizmo_set_matrix_location(cage, origin);
    WM_gizmo_set_flag(cage, WM_GIZMO_HIDDEN, false);
 
    /* need to set property here for undo. TODO would prefer to do this in _init */
    SpaceNode *snode = CTX_wm_space_node(C);
#if 0
    PointerRNA nodeptr;
    RNA_pointer_create(snode->id, &RNA_SpaceNodeEditor, snode, &nodeptr);
    WM_gizmo_target_property_def_rna(cage, "offset", &nodeptr, "backdrop_offset", -1);
    WM_gizmo_target_property_def_rna(cage, "scale", &nodeptr, "backdrop_zoom", -1);
#endif
 
    WM_gizmo_target_property_def_func(cage,
                                      "matrix",
                                      &(const struct wmGizmoPropertyFnParams){
                                          .value_get_fn = gizmo_node_backdrop_prop_matrix_get,
                                          .value_set_fn = gizmo_node_backdrop_prop_matrix_set,
                                          .range_get_fn = NULL,
                                          .user_data = snode,
                                      });
  }
  else {
    WM_gizmo_set_flag(cage, WM_GIZMO_HIDDEN, true);
  }
 
  BKE_image_release_ibuf(ima, ibuf, lock);
}
 
void NODE_GGT_backdrop_transform(wmGizmoGroupType *gzgt)
{
  gzgt->name = "Backdrop Transform Widget";
  gzgt->idname = "NODE_GGT_backdrop_transform";
 
  gzgt->flag |= WM_GIZMOGROUPTYPE_PERSISTENT;
 
  gzgt->poll = WIDGETGROUP_node_transform_poll;
  gzgt->setup = WIDGETGROUP_node_transform_setup;
  gzgt->setup_keymap = WM_gizmogroup_setup_keymap_generic_maybe_drag;
  gzgt->refresh = WIDGETGROUP_node_transform_refresh;
}
 
/* -------------------------------------------------------------------- */
struct NodeCropWidgetGroup {
  wmGizmo *border;
 
  struct {
    float dims[2];
  } state;
 
  struct {
    PointerRNA ptr;
    PropertyRNA *prop;
    bContext *context;
  } update_data;
};
 
static void gizmo_node_crop_update(struct NodeCropWidgetGroup *crop_group)
{
  RNA_property_update(
      crop_group->update_data.context, &crop_group->update_data.ptr, crop_group->update_data.prop);
}
 
static void two_xy_to_rect(const NodeTwoXYs *nxy,
                           rctf *rect,
                           const float dims[2],
                           bool is_relative)
{
  if (is_relative) {
    rect->xmin = nxy->fac_x1;
    rect->xmax = nxy->fac_x2;
    rect->ymin = nxy->fac_y1;
    rect->ymax = nxy->fac_y2;
  }
  else {
    rect->xmin = nxy->x1 / dims[0];
    rect->xmax = nxy->x2 / dims[0];
    rect->ymin = nxy->y1 / dims[1];
    rect->ymax = nxy->y2 / dims[1];
  }
}
 
static void two_xy_from_rect(NodeTwoXYs *nxy,
                             const rctf *rect,
                             const float dims[2],
                             bool is_relative)
{
  if (is_relative) {
    nxy->fac_x1 = rect->xmin;
    nxy->fac_x2 = rect->xmax;
    nxy->fac_y1 = rect->ymin;
    nxy->fac_y2 = rect->ymax;
  }
  else {
    nxy->x1 = rect->xmin * dims[0];
    nxy->x2 = rect->xmax * dims[0];
    nxy->y1 = rect->ymin * dims[1];
    nxy->y2 = rect->ymax * dims[1];
  }
}
 
/* scale callbacks */
static void gizmo_node_crop_prop_matrix_get(const wmGizmo *gz,
                                            wmGizmoProperty *gz_prop,
                                            void *value_p)
{
  float(*matrix)[4] = value_p;
  BLI_assert(gz_prop->type->array_length == 16);
  struct NodeCropWidgetGroup *crop_group = gz->parent_gzgroup->customdata;
  const float *dims = crop_group->state.dims;
  const bNode *node = gz_prop->custom_func.user_data;
  const NodeTwoXYs *nxy = node->storage;
  bool is_relative = (bool)node->custom2;
  rctf rct;
  two_xy_to_rect(nxy, &rct, dims, is_relative);
  matrix[0][0] = fabsf(BLI_rctf_size_x(&rct));
  matrix[1][1] = fabsf(BLI_rctf_size_y(&rct));
  matrix[3][0] = (BLI_rctf_cent_x(&rct) - 0.5f) * dims[0];
  matrix[3][1] = (BLI_rctf_cent_y(&rct) - 0.5f) * dims[1];
}
 
static void gizmo_node_crop_prop_matrix_set(const wmGizmo *gz,
                                            wmGizmoProperty *gz_prop,
                                            const void *value_p)
{
  const float(*matrix)[4] = value_p;
  BLI_assert(gz_prop->type->array_length == 16);
  struct NodeCropWidgetGroup *crop_group = gz->parent_gzgroup->customdata;
  const float *dims = crop_group->state.dims;
  bNode *node = gz_prop->custom_func.user_data;
  NodeTwoXYs *nxy = node->storage;
  bool is_relative = (bool)node->custom2;
  rctf rct;
  two_xy_to_rect(nxy, &rct, dims, is_relative);
  const bool nx = rct.xmin > rct.xmax;
  const bool ny = rct.ymin > rct.ymax;
  BLI_rctf_resize(&rct, fabsf(matrix[0][0]), fabsf(matrix[1][1]));
  BLI_rctf_recenter(&rct, (matrix[3][0] / dims[0]) + 0.5f, (matrix[3][1] / dims[1]) + 0.5f);
  BLI_rctf_isect(
      &(rctf){
          .xmin = 0,
          .ymin = 0,
          .xmax = 1,
          .ymax = 1,
      },
      &rct,
      &rct);
  if (nx) {
    SWAP(float, rct.xmin, rct.xmax);
  }
  if (ny) {
    SWAP(float, rct.ymin, rct.ymax);
  }
  two_xy_from_rect(nxy, &rct, dims, is_relative);
  gizmo_node_crop_update(crop_group);
}
 
static bool WIDGETGROUP_node_crop_poll(const bContext *C, wmGizmoGroupType *UNUSED(gzgt))
{
  SpaceNode *snode = CTX_wm_space_node(C);
 
  if ((snode->flag & SNODE_BACKDRAW) == 0) {
    return false;
  }
 
  if (snode && snode->edittree && snode->edittree->type == NTREE_COMPOSIT) {
    bNode *node = nodeGetActive(snode->edittree);
 
    if (node && ELEM(node->type, CMP_NODE_CROP)) {
      /* ignore 'use_crop_size', we can't usefully edit the crop in this case. */
      if ((node->custom1 & (1 << 0)) == 0) {
        return true;
      }
    }
  }
 
  return false;
}
 
static void WIDGETGROUP_node_crop_setup(const bContext *UNUSED(C), wmGizmoGroup *gzgroup)
{
  struct NodeCropWidgetGroup *crop_group = MEM_mallocN(sizeof(struct NodeCropWidgetGroup),
                                                       __func__);
 
  crop_group->border = WM_gizmo_new("GIZMO_GT_cage_2d", gzgroup, NULL);
 
  RNA_enum_set(crop_group->border->ptr,
               "transform",
               ED_GIZMO_CAGE2D_XFORM_FLAG_TRANSLATE | ED_GIZMO_CAGE2D_XFORM_FLAG_SCALE);
 
  gzgroup->customdata = crop_group;
}
 
static void WIDGETGROUP_node_crop_draw_prepare(const bContext *C, wmGizmoGroup *gzgroup)
{
  ARegion *region = CTX_wm_region(C);
  wmGizmo *gz = gzgroup->gizmos.first;
 
  SpaceNode *snode = CTX_wm_space_node(C);
 
  node_gizmo_calc_matrix_space(snode, region, gz->matrix_space);
}
 
static void WIDGETGROUP_node_crop_refresh(const bContext *C, wmGizmoGroup *gzgroup)
{
  Main *bmain = CTX_data_main(C);
  struct NodeCropWidgetGroup *crop_group = gzgroup->customdata;
  wmGizmo *gz = crop_group->border;
 
  void *lock;
  Image *ima = BKE_image_ensure_viewer(bmain, IMA_TYPE_COMPOSITE, "Viewer Node");
  ImBuf *ibuf = BKE_image_acquire_ibuf(ima, NULL, &lock);
 
  if (ibuf) {
    crop_group->state.dims[0] = (ibuf->x > 0) ? ibuf->x : 64.0f;
    crop_group->state.dims[1] = (ibuf->y > 0) ? ibuf->y : 64.0f;
 
    RNA_float_set_array(gz->ptr, "dimensions", crop_group->state.dims);
    WM_gizmo_set_flag(gz, WM_GIZMO_HIDDEN, false);
 
    SpaceNode *snode = CTX_wm_space_node(C);
    bNode *node = nodeGetActive(snode->edittree);
 
    crop_group->update_data.context = (bContext *)C;
    RNA_pointer_create(
        (ID *)snode->edittree, &RNA_CompositorNodeCrop, node, &crop_group->update_data.ptr);
    crop_group->update_data.prop = RNA_struct_find_property(&crop_group->update_data.ptr,
                                                            "relative");
 
    WM_gizmo_target_property_def_func(gz,
                                      "matrix",
                                      &(const struct wmGizmoPropertyFnParams){
                                          .value_get_fn = gizmo_node_crop_prop_matrix_get,
                                          .value_set_fn = gizmo_node_crop_prop_matrix_set,
                                          .range_get_fn = NULL,
                                          .user_data = node,
                                      });
  }
  else {
    WM_gizmo_set_flag(gz, WM_GIZMO_HIDDEN, true);
  }
 
  BKE_image_release_ibuf(ima, ibuf, lock);
}
 
void NODE_GGT_backdrop_crop(wmGizmoGroupType *gzgt)
{
  gzgt->name = "Backdrop Crop Widget";
  gzgt->idname = "NODE_GGT_backdrop_crop";
 
  gzgt->flag |= WM_GIZMOGROUPTYPE_PERSISTENT;
 
  gzgt->poll = WIDGETGROUP_node_crop_poll;
  gzgt->setup = WIDGETGROUP_node_crop_setup;
  gzgt->setup_keymap = WM_gizmogroup_setup_keymap_generic_maybe_drag;
  gzgt->draw_prepare = WIDGETGROUP_node_crop_draw_prepare;
  gzgt->refresh = WIDGETGROUP_node_crop_refresh;
}
 
/* -------------------------------------------------------------------- */
struct NodeSunBeamsWidgetGroup {
  wmGizmo *gizmo;
 
  struct {
    float dims[2];
  } state;
};
 
static bool WIDGETGROUP_node_sbeam_poll(const bContext *C, wmGizmoGroupType *UNUSED(gzgt))
{
  SpaceNode *snode = CTX_wm_space_node(C);
 
  if ((snode->flag & SNODE_BACKDRAW) == 0) {
    return false;
  }
 
  if (snode && snode->edittree && snode->edittree->type == NTREE_COMPOSIT) {
    bNode *node = nodeGetActive(snode->edittree);
 
    if (node && ELEM(node->type, CMP_NODE_SUNBEAMS)) {
      return true;
    }
  }
 
  return false;
}
 
static void WIDGETGROUP_node_sbeam_setup(const bContext *UNUSED(C), wmGizmoGroup *gzgroup)
{
  struct NodeSunBeamsWidgetGroup *sbeam_group = MEM_mallocN(sizeof(struct NodeSunBeamsWidgetGroup),
                                                            __func__);
 
  sbeam_group->gizmo = WM_gizmo_new("GIZMO_GT_move_3d", gzgroup, NULL);
  wmGizmo *gz = sbeam_group->gizmo;
 
  RNA_enum_set(gz->ptr, "draw_style", ED_GIZMO_MOVE_STYLE_CROSS_2D);
 
  gz->scale_basis = 0.05f / 75.0f;
 
  gzgroup->customdata = sbeam_group;
}
 
static void WIDGETGROUP_node_sbeam_draw_prepare(const bContext *C, wmGizmoGroup *gzgroup)
{
  struct NodeSunBeamsWidgetGroup *sbeam_group = gzgroup->customdata;
  ARegion *region = CTX_wm_region(C);
  wmGizmo *gz = gzgroup->gizmos.first;
 
  SpaceNode *snode = CTX_wm_space_node(C);
 
  node_gizmo_calc_matrix_space_with_image_dims(
      snode, region, sbeam_group->state.dims, gz->matrix_space);
}
 
static void WIDGETGROUP_node_sbeam_refresh(const bContext *C, wmGizmoGroup *gzgroup)
{
  Main *bmain = CTX_data_main(C);
  struct NodeSunBeamsWidgetGroup *sbeam_group = gzgroup->customdata;
  wmGizmo *gz = sbeam_group->gizmo;
 
  void *lock;
  Image *ima = BKE_image_ensure_viewer(bmain, IMA_TYPE_COMPOSITE, "Viewer Node");
  ImBuf *ibuf = BKE_image_acquire_ibuf(ima, NULL, &lock);
 
  if (ibuf) {
    sbeam_group->state.dims[0] = (ibuf->x > 0) ? ibuf->x : 64.0f;
    sbeam_group->state.dims[1] = (ibuf->y > 0) ? ibuf->y : 64.0f;
 
    SpaceNode *snode = CTX_wm_space_node(C);
    bNode *node = nodeGetActive(snode->edittree);
 
    /* need to set property here for undo. TODO would prefer to do this in _init */
    PointerRNA nodeptr;
    RNA_pointer_create((ID *)snode->edittree, &RNA_CompositorNodeSunBeams, node, &nodeptr);
    WM_gizmo_target_property_def_rna(gz, "offset", &nodeptr, "source", -1);
 
    WM_gizmo_set_flag(gz, WM_GIZMO_DRAW_MODAL, true);
  }
  else {
    WM_gizmo_set_flag(gz, WM_GIZMO_HIDDEN, true);
  }
 
  BKE_image_release_ibuf(ima, ibuf, lock);
}
 
void NODE_GGT_backdrop_sun_beams(wmGizmoGroupType *gzgt)
{
  gzgt->name = "Sun Beams Widget";
  gzgt->idname = "NODE_GGT_sbeam";
 
  gzgt->flag |= WM_GIZMOGROUPTYPE_PERSISTENT;
 
  gzgt->poll = WIDGETGROUP_node_sbeam_poll;
  gzgt->setup = WIDGETGROUP_node_sbeam_setup;
  gzgt->setup_keymap = WM_gizmogroup_setup_keymap_generic_maybe_drag;
  gzgt->draw_prepare = WIDGETGROUP_node_sbeam_draw_prepare;
  gzgt->refresh = WIDGETGROUP_node_sbeam_refresh;
}
 
/* -------------------------------------------------------------------- */
struct NodeCornerPinWidgetGroup {
  wmGizmo *gizmos[4];
 
  struct {
    float dims[2];
  } state;
};
 
static bool WIDGETGROUP_node_corner_pin_poll(const bContext *C, wmGizmoGroupType *UNUSED(gzgt))
{
  SpaceNode *snode = CTX_wm_space_node(C);
 
  if ((snode->flag & SNODE_BACKDRAW) == 0) {
    return false;
  }
 
  if (snode && snode->edittree && snode->edittree->type == NTREE_COMPOSIT) {
    bNode *node = nodeGetActive(snode->edittree);
 
    if (node && ELEM(node->type, CMP_NODE_CORNERPIN)) {
      return true;
    }
  }
 
  return false;
}
 
static void WIDGETGROUP_node_corner_pin_setup(const bContext *UNUSED(C), wmGizmoGroup *gzgroup)
{
  struct NodeCornerPinWidgetGroup *cpin_group = MEM_mallocN(
      sizeof(struct NodeCornerPinWidgetGroup), __func__);
  const wmGizmoType *gzt_move_3d = WM_gizmotype_find("GIZMO_GT_move_3d", false);
 
  for (int i = 0; i < 4; i++) {
    cpin_group->gizmos[i] = WM_gizmo_new_ptr(gzt_move_3d, gzgroup, NULL);
    wmGizmo *gz = cpin_group->gizmos[i];
 
    RNA_enum_set(gz->ptr, "draw_style", ED_GIZMO_MOVE_STYLE_CROSS_2D);
 
    gz->scale_basis = 0.01f / 75.0;
  }
 
  gzgroup->customdata = cpin_group;
}
 
static void WIDGETGROUP_node_corner_pin_draw_prepare(const bContext *C, wmGizmoGroup *gzgroup)
{
  struct NodeCornerPinWidgetGroup *cpin_group = gzgroup->customdata;
  ARegion *region = CTX_wm_region(C);
 
  SpaceNode *snode = CTX_wm_space_node(C);
 
  float matrix_space[4][4];
  node_gizmo_calc_matrix_space_with_image_dims(
      snode, region, cpin_group->state.dims, matrix_space);
 
  for (int i = 0; i < 4; i++) {
    wmGizmo *gz = cpin_group->gizmos[i];
    copy_m4_m4(gz->matrix_space, matrix_space);
  }
}
 
static void WIDGETGROUP_node_corner_pin_refresh(const bContext *C, wmGizmoGroup *gzgroup)
{
  Main *bmain = CTX_data_main(C);
  struct NodeCornerPinWidgetGroup *cpin_group = gzgroup->customdata;
 
  void *lock;
  Image *ima = BKE_image_ensure_viewer(bmain, IMA_TYPE_COMPOSITE, "Viewer Node");
  ImBuf *ibuf = BKE_image_acquire_ibuf(ima, NULL, &lock);
 
  if (ibuf) {
    cpin_group->state.dims[0] = (ibuf->x > 0) ? ibuf->x : 64.0f;
    cpin_group->state.dims[1] = (ibuf->y > 0) ? ibuf->y : 64.0f;
 
    SpaceNode *snode = CTX_wm_space_node(C);
    bNode *node = nodeGetActive(snode->edittree);
 
    /* need to set property here for undo. TODO would prefer to do this in _init */
    int i = 0;
    for (bNodeSocket *sock = node->inputs.first; sock && i < 4; sock = sock->next) {
      if (sock->type == SOCK_VECTOR) {
        wmGizmo *gz = cpin_group->gizmos[i++];
 
        PointerRNA sockptr;
        RNA_pointer_create((ID *)snode->edittree, &RNA_NodeSocket, sock, &sockptr);
        WM_gizmo_target_property_def_rna(gz, "offset", &sockptr, "default_value", -1);
 
        WM_gizmo_set_flag(gz, WM_GIZMO_DRAW_MODAL, true);
      }
    }
  }
  else {
    for (int i = 0; i < 4; i++) {
      wmGizmo *gz = cpin_group->gizmos[i];
      WM_gizmo_set_flag(gz, WM_GIZMO_HIDDEN, true);
    }
  }
 
  BKE_image_release_ibuf(ima, ibuf, lock);
}
 
void NODE_GGT_backdrop_corner_pin(wmGizmoGroupType *gzgt)
{
  gzgt->name = "Corner Pin Widget";
  gzgt->idname = "NODE_GGT_backdrop_corner_pin";
 
  gzgt->flag |= WM_GIZMOGROUPTYPE_PERSISTENT;
 
  gzgt->poll = WIDGETGROUP_node_corner_pin_poll;
  gzgt->setup = WIDGETGROUP_node_corner_pin_setup;
  gzgt->setup_keymap = WM_gizmogroup_setup_keymap_generic_maybe_drag;
  gzgt->draw_prepare = WIDGETGROUP_node_corner_pin_draw_prepare;
  gzgt->refresh = WIDGETGROUP_node_corner_pin_refresh;
}