VSE: Improve motion-picture workflow

This commit resolves problem introduced in e1665c3d3190 - it was
difficult to import media at their original resolution.
This is done by using original resolution as reference for scale.

All crop and strip transform values and their animation is converted
form old files.

To make both workflows easy to use, sequencer tool settings have been
created with preset for preffered scaling method. This setting is in
sequencer timeline header and add image or movie strip operator
properties.

Two new operators have been added:
`sequencer.strip_transform_fit` operator with 3 options: Scale To Fit,
Scale to Fill and Stretch To Fill.
Operator can fail if strip image or video is not loaded currently, this
case should be either sanitized or data loaded on demand.

`sequencer.strip_transform_clear` operator with 4 options:
Clear position, scale, rotation and all (previous 3 options combined).

Reviewed By: sergey, fsiddi

Differential Revision: https://developer.blender.org/D9582

1 files changed, 27 insertions, 0 deletions

diff --git a/source/blender/sequencer/SEQ_sequencer.h b/source/blender/sequencer/SEQ_sequencer.h
index 8c4863d98ed..9b4c88520b4 100644
--- a/source/blender/sequencer/SEQ_sequencer.h
+++ b/source/blender/sequencer/SEQ_sequencer.h
@@ -23,6 +23,8 @@
  * \ingroup sequencer
  */
 
+#include "DNA_scene_types.h"
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -47,6 +49,10 @@ struct StripElem;
 struct TextVars;
 struct bContext;
 struct bSound;
+struct BlendWriter;
+struct BlendDataReader;
+struct BlendLibReader;
+struct SequencerToolSettings;
 
 /* Wipe effect */
 enum {
@@ -179,6 +185,12 @@ void SEQ_render_pixel_from_sequencer_space_v4(struct Scene *scene, float pixel[4
  * Sequencer scene functions
  * ********************************************************************** */
 
+struct SequencerToolSettings *SEQ_tool_settings_init(void);
+void SEQ_tool_settings_free(struct SequencerToolSettings *tool_settings);
+eSeqImageFitMethod SEQ_tool_settings_fit_method_get(struct Scene *scene);
+void SEQ_tool_settings_fit_method_set(struct Scene *scene, eSeqImageFitMethod fit_method);
+
+struct SequencerToolSettings *SEQ_tool_settings_copy(struct SequencerToolSettings *tool_settings);
 struct Editing *BKE_sequencer_editing_get(struct Scene *scene, bool alloc);
 struct Editing *BKE_sequencer_editing_ensure(struct Scene *scene);
 void BKE_sequencer_editing_free(struct Scene *scene, const bool do_id_user);
@@ -361,6 +373,20 @@ void BKE_sequence_invalidate_cache_in_range(struct Scene *scene,
 void BKE_sequencer_all_free_anim_ibufs(struct Scene *scene, int timeline_frame);
 
 /* **********************************************************************
+ * util.c
+ *
+ * Add strips
+ * **********************************************************************
+ */
+
+void SEQ_set_scale_to_fit(const struct Sequence *seq,
+                          const int image_width,
+                          const int image_height,
+                          const int preview_width,
+                          const int preview_height,
+                          const eSeqImageFitMethod fit_method);
+
+/* **********************************************************************
  * sequencer.c
  *
  * Add strips
@@ -376,6 +402,7 @@ typedef struct SeqLoadInfo {
   int type;
   int len;         /* only for image strips */
   char path[1024]; /* 1024 = FILE_MAX */
+  eSeqImageFitMethod fit_method;
 
   /* multiview */
   char views_format;