Cleanup: Rename & refactor several F-curve functions

Rename and refactor several F-curve key manipulation functions, and move
them from `editors` to `blenkernel`.

The functions formerly known as `delete_fcurve_key`,
`delete_fcurve_keys`, and `clear_fcurve_keys` have been moved from
`ED_keyframes_edit.h` to `BKE_fcurve.h` and have been renamed according
to hierarchical naming rules.

Below is a table of the naming changes.

| From | To |
| -- | -- |
| `delete_fcurve_key(fcu, index, do_recalc)` | `BKE_fcurve_delete_key(fcu, index)` |
| `delete_fcurve_keys(fcu)` | `BKE_fcurve_delete_keys_selected(fcu)` |
| `clear_fcurve_keys(fcu)` | `BKE_fcurve_delete_keys_all(fcu)` |
| `calchandles_fcurve()` | `BKE_fcurve_handles_recalc()` |
| `calchandles_fcurve_ex()`| `BKE_fcurve_handles_recalc_ex()` |

The function formerly known as `delete_fcurve_key` no longer takes a
`do_fast` parameter, which determined whether or not to call
`calchandles_fcurve`. Now, the responsibility is on the caller to run
the new `BKE_fcurve_handles_recalc` function if they have want to
recalculate the handles.

In addition, there is now a new static private function called
`fcurve_bezt_free` which sets the key count to zero and frees the key
array. This function is now used in couple of instances of functionally
equivalent code. Note that `BKE_fcurve_delete_keys_all` is just a
wrapper around `fcurve_bezt_free`.

This change was initially spurred by the fact that `delete_fcurve_keys`
was improperly named; this was a good opportunity to fix the location
and naming of a few of these functions.

Reviewed By: sybren

Differential Revision: https://developer.blender.org/D15282

2 files changed, 3 insertions, 3 deletions

diff --git a/source/blender/io/collada/AnimationImporter.cpp b/source/blender/io/collada/AnimationImporter.cpp
index 923a392dbde..cc91c3eeac9 100644
--- a/source/blender/io/collada/AnimationImporter.cpp
+++ b/source/blender/io/collada/AnimationImporter.cpp
@@ -64,7 +64,7 @@ void AnimationImporter::add_bezt(FCurve *fcu,
   bez.f1 = bez.f2 = bez.f3 = SELECT;
   bez.h1 = bez.h2 = HD_AUTO;
   insert_bezt_fcurve(fcu, &bez, INSERTKEY_NOFLAGS);
-  calchandles_fcurve(fcu);
+  BKE_fcurve_handles_recalc(fcu);
 }
 
 void AnimationImporter::animation_to_fcurves(COLLADAFW::AnimationCurve *curve)
@@ -132,7 +132,7 @@ void AnimationImporter::animation_to_fcurves(COLLADAFW::AnimationCurve *curve)
           insert_bezt_fcurve(fcu, &bez, INSERTKEY_NOFLAGS);
         }
 
-        calchandles_fcurve(fcu);
+        BKE_fcurve_handles_recalc(fcu);
 
         fcurves.push_back(fcu);
         unused_curves.push_back(fcu);
diff --git a/source/blender/io/collada/BCAnimationCurve.cpp b/source/blender/io/collada/BCAnimationCurve.cpp
index fbb2ba499a5..04a7a81c0a6 100644
--- a/source/blender/io/collada/BCAnimationCurve.cpp
+++ b/source/blender/io/collada/BCAnimationCurve.cpp
@@ -96,7 +96,7 @@ void BCAnimationCurve::create_bezt(float frame, float output)
   bez.f1 = bez.f2 = bez.f3 = SELECT;
   bez.h1 = bez.h2 = HD_AUTO;
   insert_bezt_fcurve(fcu, &bez, INSERTKEY_NOFLAGS);
-  calchandles_fcurve(fcu);
+  BKE_fcurve_handles_recalc(fcu);
 }
 
 BCAnimationCurve::~BCAnimationCurve()