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, 164 insertions, 0 deletions

diff --git a/source/blender/editors/space_sequencer/sequencer_modifier.c b/source/blender/editors/space_sequencer/sequencer_modifier.c
new file mode 100644
index 00000000000..4ae4b995c11
--- /dev/null
+++ b/source/blender/editors/space_sequencer/sequencer_modifier.c
@@ -0,0 +1,164 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2012 Blender Foundation.
+ * All rights reserved.
+ *
+ * Contributor(s): Blender Foundation,
+ *                 Sergey Sharybin
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+
+/** \file blender/editors/space_sequencer/sequencer_modifier.c
+ *  \ingroup spseq
+ */
+
+#include "MEM_guardedalloc.h"
+
+#include "BLI_blenlib.h"
+#include "BLI_math.h"
+#include "BLI_utildefines.h"
+
+#include "DNA_scene_types.h"
+#include "DNA_mask_types.h"
+#include "DNA_userdef_types.h"
+
+#include "BKE_context.h"
+#include "BKE_global.h"
+#include "BKE_library.h"
+#include "BKE_main.h"
+#include "BKE_sequencer.h"
+#include "BKE_movieclip.h"
+#include "BKE_sequencer.h"
+#include "BKE_mask.h"
+#include "BKE_report.h"
+
+#include "WM_api.h"
+#include "WM_types.h"
+
+#include "RNA_define.h"
+#include "RNA_enum_types.h"
+
+#include "UI_interface.h"
+#include "UI_resources.h"
+
+/* own include */
+#include "sequencer_intern.h"
+
+/*********************** Add modifier operator *************************/
+
+static int strip_modifier_active_poll(bContext *C)
+{
+	Scene *scene = CTX_data_scene(C);
+	Editing *ed = BKE_sequencer_editing_get(scene, FALSE);
+
+	if (ed) {
+		Sequence *seq = BKE_sequencer_active_get(scene);
+
+		if (seq)
+			return BKE_sequence_supports_modifiers(seq);
+	}
+
+	return FALSE;
+}
+
+static int strip_modifier_add_exec(bContext *C, wmOperator *op)
+{
+	Scene *scene = CTX_data_scene(C);
+	Sequence *seq = BKE_sequencer_active_get(scene);
+	int type = RNA_enum_get(op->ptr, "type");
+
+	BKE_sequence_modifier_new(seq, type);
+
+	BKE_sequence_invalidate_cache(scene, seq);
+	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);
+
+	return OPERATOR_FINISHED;
+}
+
+void SEQUENCER_OT_strip_modifier_add(wmOperatorType *ot)
+{
+	PropertyRNA *prop;
+
+	/* TODO: de-duplicate from RNA */
+	static EnumPropertyItem sequence_modifier_type_items[] = {
+		{seqModifierType_ColorBalance, "COLOR_BALANCE", ICON_NONE, "Color Balance", ""},
+		{seqModifierType_Curves, "CURVES", ICON_NONE, "Curves", ""},
+		{seqModifierType_HueCorrect,"HUE_CORRECT", ICON_NONE, "Hue Correct", ""},
+		{0, NULL, 0, NULL, NULL}
+	};
+
+	/* identifiers */
+	ot->name = "Add Strip Modifier";
+	ot->idname = "SEQUENCER_OT_strip_modifier_add";
+	ot->description = "Add a modifier to strip";
+
+	/* api callbacks */
+	ot->exec = strip_modifier_add_exec;
+	ot->poll = strip_modifier_active_poll;
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+	/* properties */
+	prop = RNA_def_enum(ot->srna, "type", sequence_modifier_type_items, seqModifierType_ColorBalance, "Type", "");
+	ot->prop = prop;
+}
+
+/*********************** Remove modifier operator *************************/
+
+static int strip_modifier_remove_exec(bContext *C, wmOperator *op)
+{
+	Scene *scene = CTX_data_scene(C);
+	Sequence *seq = BKE_sequencer_active_get(scene);
+	char name[MAX_NAME];
+	SequenceModifierData *smd;
+
+	RNA_string_get(op->ptr, "name", name);
+
+	smd = BKE_sequence_modifier_find_by_name(seq, name);
+	if (!smd)
+		return OPERATOR_CANCELLED;
+
+	BLI_remlink(&seq->modifiers, smd);
+	BKE_sequence_modifier_free(smd);
+
+	BKE_sequence_invalidate_cache(scene, seq);
+	WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);
+
+	return OPERATOR_FINISHED;
+}
+
+void SEQUENCER_OT_strip_modifier_remove(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Remove Strip Modifier";
+	ot->idname = "SEQUENCER_OT_strip_modifier_remove";
+	ot->description = "Add a modifier to strip";
+
+	/* api callbacks */
+	ot->exec = strip_modifier_remove_exec;
+	ot->poll = strip_modifier_active_poll;
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+	/* properties */
+	RNA_def_string(ot->srna, "name", "Name", MAX_NAME, "Name", "Name of modifier to remove");
+}