Sequencer: per-sequence modifier stack for color grading

This implements basic color grading modifiers in sequencer, supporting
color balance, RGB curves and HUE corrections.

Implementation is close to object modifiers, some details are there:

http://wiki.blender.org/index.php/User:Nazg-gul/SequencerModifiers

Modifiers supports multi-threaded calculation, masks and instant
parameter changes.

Also added cache for pre-processed image buffers for current frame,
so changing sequence properties does not require rendering of original
sequence (like rendering scene, loading file from disk and so)

1 files changed, 50 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_sequencer.h b/source/blender/blenkernel/BKE_sequencer.h
index 823b1dd14da..d05e065ac15 100644
--- a/source/blender/blenkernel/BKE_sequencer.h
+++ b/source/blender/blenkernel/BKE_sequencer.h
@@ -31,11 +31,14 @@
  */
 
 struct bContext;
+struct StripColorBalance;
 struct Editing;
 struct ImBuf;
 struct Main;
+struct Mask;
 struct Scene;
 struct Sequence;
+struct SequenceModifierData;
 struct Strip;
 struct StripElem;
 struct bSound;
@@ -241,6 +244,10 @@ void BKE_sequencer_cache_put(SeqRenderData context, struct Sequence *seq, float
 
 void BKE_sequencer_cache_cleanup_sequence(struct Sequence *seq);
 
+struct ImBuf *BKE_sequencer_preprocessed_cache_get(SeqRenderData context, struct Sequence *seq, float cfra, seq_stripelem_ibuf_t type);
+void BKE_sequencer_preprocessed_cache_put(SeqRenderData context, struct Sequence *seq, float cfra, seq_stripelem_ibuf_t type, struct ImBuf *ibuf);
+void BKE_sequencer_preprocessed_cache_cleanup_sequence(struct Sequence *seq);
+
 /* **********************************************************************
  * seqeffects.c
  *
@@ -289,6 +296,7 @@ int BKE_sequence_swap(struct Sequence *seq_a, struct Sequence *seq_b, const char
 
 int BKE_sequence_check_depend(struct Sequence *seq, struct Sequence *cur);
 void BKE_sequence_invalidate_cache(struct Scene *scene, struct Sequence *seq);
+void BKE_sequence_invalidate_cache_for_modifier(struct Scene *scene, struct Sequence *seq);
 
 void BKE_sequencer_update_sound_bounds_all(struct Scene *scene);
 void BKE_sequencer_update_sound_bounds(struct Scene *scene, struct Sequence *seq);
@@ -347,4 +355,46 @@ extern SequencerDrawView sequencer_view3d_cb;
 extern ListBase seqbase_clipboard;
 extern int seqbase_clipboard_frame;
 
+/* modifiers */
+typedef struct SequenceModifierTypeInfo {
+	/* default name for the modifier */
+	char name[64];  /* MAX_NAME */
+
+	/* DNA structure name used on load/save filed */
+	char struct_name[64];  /* MAX_NAME */
+
+	/* size of modifier data structure, used by allocation */
+	int struct_size;
+
+	/* data initialization */
+	void (*init_data) (struct SequenceModifierData *smd);
+
+	/* free data used by modifier,
+	 * only modifier-specific data should be freed, modifier descriptor would
+	 * be freed outside of this callback
+	 */
+	void (*free_data) (struct SequenceModifierData *smd);
+
+	/* copy data from one modifier to another */
+	void (*copy_data) (struct SequenceModifierData *smd, struct SequenceModifierData *target);
+
+	/* apply modifier on a given image buffer */
+	struct ImBuf* (*apply) (struct SequenceModifierData *smd, struct ImBuf *ibuf, struct ImBuf *mask);
+} SequenceModifierTypeInfo;
+
+struct SequenceModifierTypeInfo *BKE_sequence_modifier_type_info_get(int type);
+
+void BKE_sequence_modifier_new(struct Sequence *seq, int type);
+void BKE_sequence_modifier_free(struct SequenceModifierData *smd);
+void BKE_sequence_modifier_unique_name(struct Sequence *seq, struct SequenceModifierData *smd);
+struct SequenceModifierData *BKE_sequence_modifier_find_by_name(struct Sequence *seq, char *name);
+struct ImBuf *BKE_sequence_modifier_apply_stack(SeqRenderData context, struct Sequence *seq, struct ImBuf *ibuf, int cfra);
+void BKE_sequence_modifier_list_copy(struct Sequence *seqn, struct Sequence *seq);
+
+int BKE_sequence_supports_modifiers(struct Sequence *seq);
+
+/* internal filters */
+struct ImBuf *BKE_sequencer_render_mask_input(SeqRenderData context, int mask_input_type, struct Sequence *mask_sequence, struct Mask *mask_id, int cfra, int make_float);
+void BKE_sequencer_color_balance_apply(struct StripColorBalance *cb, struct ImBuf *ibuf, float mul, short make_float, struct ImBuf *mask_input);
+
 #endif /* __BKE_SEQUENCER_H__ */