Cleanup: Remove scene frame macros (`CFRA` et al.)

Removes the following macros for scene/render frame values:
- `CFRA`
- `SUBFRA`
- `SFRA`
- `EFRA`

These macros don't add much, other than saving a few characters when typing.
It's not immediately clear what they refer to, they just hide what they
actually access. Just be explicit and clear about that.
Plus these macros gave read and write access to the variables, so eyesores like
this would be done (eyesore because it looks like assigning to a constant):
```
CFRA = some_frame_nbr;
```

Reviewed By: sergey

Differential Revision: https://developer.blender.org/D15311

1 files changed, 4 insertions, 4 deletions

diff --git a/source/blender/editors/gpencil/gpencil_convert.c b/source/blender/editors/gpencil/gpencil_convert.c
index 0601d009bf7..25b5466e260 100644
--- a/source/blender/editors/gpencil/gpencil_convert.c
+++ b/source/blender/editors/gpencil/gpencil_convert.c
@@ -1271,7 +1271,7 @@ static void gpencil_layer_to_curve(bContext *C,
   Collection *collection = CTX_data_collection(C);
   Scene *scene = CTX_data_scene(C);
 
-  bGPDframe *gpf = BKE_gpencil_layer_frame_get(gpl, CFRA, GP_GETFRAME_USE_PREV);
+  bGPDframe *gpf = BKE_gpencil_layer_frame_get(gpl, scene->r.cfra, GP_GETFRAME_USE_PREV);
   bGPDstroke *prev_gps = NULL;
   Object *ob;
   Curve *cu;
@@ -1414,7 +1414,7 @@ static bool gpencil_convert_check_has_valid_timing(bContext *C, bGPDlayer *gpl,
   int i;
   bool valid = true;
 
-  if (!gpl || !(gpf = BKE_gpencil_layer_frame_get(gpl, CFRA, GP_GETFRAME_USE_PREV)) ||
+  if (!gpl || !(gpf = BKE_gpencil_layer_frame_get(gpl, scene->r.cfra, GP_GETFRAME_USE_PREV)) ||
       !(gps = gpf->strokes.first)) {
     return false;
   }
@@ -1481,7 +1481,7 @@ static bool gpencil_convert_poll(bContext *C)
    * and if we are not in edit mode!
    */
   return ((area && area->spacetype == SPACE_VIEW3D) && (gpl = BKE_gpencil_layer_active_get(gpd)) &&
-          (gpf = BKE_gpencil_layer_frame_get(gpl, CFRA, GP_GETFRAME_USE_PREV)) &&
+          (gpf = BKE_gpencil_layer_frame_get(gpl, scene->r.cfra, GP_GETFRAME_USE_PREV)) &&
           (gpf->strokes.first) && (!GPENCIL_ANY_EDIT_MODE(gpd)));
 }
 
@@ -1811,7 +1811,7 @@ static int image_to_gpencil_exec(bContext *C, wmOperator *op)
   /* Add layer and frame. */
   bGPdata *gpd = (bGPdata *)ob->data;
   bGPDlayer *gpl = BKE_gpencil_layer_addnew(gpd, "Image Layer", true, false);
-  bGPDframe *gpf = BKE_gpencil_frame_addnew(gpl, CFRA);
+  bGPDframe *gpf = BKE_gpencil_frame_addnew(gpl, scene->r.cfra);
   done = BKE_gpencil_from_image(sima, gpd, gpf, size, is_mask);
 
   if (done) {