Sequencer: 2D cursor for the preview & transform

- Use 2D cursor in the preview space using shortcuts
  matching the UV editor and 3D view.
- Add Cursor tool, cursor transform.
- Support for cursor and bound-box pivot.
- Add pivot pie menu.

5 files changed, 81 insertions, 0 deletions

diff --git a/source/blender/editors/space_sequencer/CMakeLists.txt b/source/blender/editors/space_sequencer/CMakeLists.txt
index 1471929defb..bf8cf89699d 100644
--- a/source/blender/editors/space_sequencer/CMakeLists.txt
+++ b/source/blender/editors/space_sequencer/CMakeLists.txt
@@ -22,6 +22,7 @@ set(INC
   ../../blenlib
   ../../blentranslation
   ../../depsgraph
+  ../../draw
   ../../gpu
   ../../imbuf
   ../../makesdna
diff --git a/source/blender/editors/space_sequencer/sequencer_edit.c b/source/blender/editors/space_sequencer/sequencer_edit.c
index 655cfb9375c..50a74d9e636 100644
--- a/source/blender/editors/space_sequencer/sequencer_edit.c
+++ b/source/blender/editors/space_sequencer/sequencer_edit.c
@@ -3397,3 +3397,64 @@ void SEQUENCER_OT_strip_color_tag_set(struct wmOperatorType *ot)
 }
 
 /** \} */
+
+/* -------------------------------------------------------------------- */
+/** \name Set 2D Cursor Operator
+ * \{ */
+
+static int sequencer_set_2d_cursor_exec(bContext *C, wmOperator *op)
+{
+  Scene *scene = CTX_data_scene(C);
+  SpaceSeq *sseq = CTX_wm_space_seq(C);
+
+  float cursor_pixel[2];
+  RNA_float_get_array(op->ptr, "location", cursor_pixel);
+
+  SEQ_image_preview_unit_from_px(scene, cursor_pixel, sseq->cursor);
+
+  WM_event_add_notifier(C, NC_SPACE | ND_SPACE_SEQUENCER, NULL);
+
+  return OPERATOR_FINISHED;
+}
+
+static int sequencer_set_2d_cursor_invoke(bContext *C, wmOperator *op, const wmEvent *event)
+{
+  ARegion *region = CTX_wm_region(C);
+  float cursor_pixel[2];
+  UI_view2d_region_to_view(
+      &region->v2d, event->mval[0], event->mval[1], &cursor_pixel[0], &cursor_pixel[1]);
+
+  RNA_float_set_array(op->ptr, "location", cursor_pixel);
+
+  return sequencer_set_2d_cursor_exec(C, op);
+}
+
+void SEQUENCER_OT_cursor_set(wmOperatorType *ot)
+{
+  /* identifiers */
+  ot->name = "Set 2D Cursor";
+  ot->description = "Set 2D cursor location";
+  ot->idname = "SEQUENCER_OT_cursor_set";
+
+  /* api callbacks */
+  ot->exec = sequencer_set_2d_cursor_exec;
+  ot->invoke = sequencer_set_2d_cursor_invoke;
+  ot->poll = sequencer_view_preview_poll;
+
+  /* flags */
+  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+  /* properties */
+  RNA_def_float_vector(ot->srna,
+                       "location",
+                       2,
+                       NULL,
+                       -FLT_MAX,
+                       FLT_MAX,
+                       "Location",
+                       "Cursor location in normalized preview coordinates",
+                       -10.0f,
+                       10.0f);
+}
+
+/** \} */
diff --git a/source/blender/editors/space_sequencer/sequencer_intern.h b/source/blender/editors/space_sequencer/sequencer_intern.h
index 730d4d11e78..5982a0a8993 100644
--- a/source/blender/editors/space_sequencer/sequencer_intern.h
+++ b/source/blender/editors/space_sequencer/sequencer_intern.h
@@ -165,6 +165,7 @@ void SEQUENCER_OT_strip_transform_clear(struct wmOperatorType *ot);
 void SEQUENCER_OT_strip_transform_fit(struct wmOperatorType *ot);
 
 void SEQUENCER_OT_strip_color_tag_set(struct wmOperatorType *ot);
+void SEQUENCER_OT_cursor_set(struct wmOperatorType *ot);
 
 /* sequencer_select.c */
 void SEQUENCER_OT_select_all(struct wmOperatorType *ot);
diff --git a/source/blender/editors/space_sequencer/sequencer_ops.c b/source/blender/editors/space_sequencer/sequencer_ops.c
index 95f7b44264c..2c5f211b0e4 100644
--- a/source/blender/editors/space_sequencer/sequencer_ops.c
+++ b/source/blender/editors/space_sequencer/sequencer_ops.c
@@ -80,6 +80,7 @@ void sequencer_operatortypes(void)
   WM_operatortype_append(SEQUENCER_OT_strip_transform_fit);
 
   WM_operatortype_append(SEQUENCER_OT_strip_color_tag_set);
+  WM_operatortype_append(SEQUENCER_OT_cursor_set);
 
   /* sequencer_select.c */
   WM_operatortype_append(SEQUENCER_OT_select_all);
diff --git a/source/blender/editors/space_sequencer/space_sequencer.c b/source/blender/editors/space_sequencer/space_sequencer.c
index ad0ceb82709..c1f853270e9 100644
--- a/source/blender/editors/space_sequencer/space_sequencer.c
+++ b/source/blender/editors/space_sequencer/space_sequencer.c
@@ -41,6 +41,8 @@
 #include "BKE_screen.h"
 #include "BKE_sequencer_offscreen.h"
 
+#include "GPU_state.h"
+
 #include "ED_screen.h"
 #include "ED_space_api.h"
 #include "ED_transform.h"
@@ -53,6 +55,7 @@
 
 #include "RNA_access.h"
 
+#include "SEQ_transform.h"
 #include "SEQ_utils.h"
 
 #include "UI_interface.h"
@@ -61,6 +64,9 @@
 
 #include "IMB_imbuf.h"
 
+/* Only for cursor drawing. */
+#include "DRW_engine.h"
+
 /* Own include. */
 #include "sequencer_intern.h"
 
@@ -803,6 +809,17 @@ static void sequencer_preview_region_draw(const bContext *C, ARegion *region)
     }
   }
 
+  {
+    GPU_color_mask(true, true, true, true);
+    GPU_depth_mask(false);
+    GPU_depth_test(GPU_DEPTH_NONE);
+
+    float cursor_pixel[2];
+    SEQ_image_preview_unit_to_px(scene, sseq->cursor, cursor_pixel);
+
+    DRW_draw_cursor_2d_ex(region, cursor_pixel);
+  }
+
   WM_gizmomap_draw(region->gizmo_map, C, WM_GIZMOMAP_DRAWSTEP_2D);
 
   if ((U.uiflag & USER_SHOW_FPS) && ED_screen_animation_no_scrub(wm)) {