From c94fe5e2995873536cbdb180652b1aa027e4ef8d Mon Sep 17 00:00:00 2001
From: Sergey Sharybin <sergey.vfx@gmail.com>
Date: Tue, 6 Sep 2011 07:59:18 +0000
Subject: Grease pencil: non-blocking sketch sessions

- Implement own undo stack for grease pencil, so now there'll be no keymaps conflicts.
- Supported redo's during sketch session.
- Get rid of flag stored in Globals -- use undo stack to check if grease pencil session is active.
---
 source/blender/editors/gpencil/gpencil_undo.c | 168 ++++++++++++++++++++++++++
 1 file changed, 168 insertions(+)
 create mode 100644 source/blender/editors/gpencil/gpencil_undo.c

(limited to 'source/blender/editors/gpencil/gpencil_undo.c')

diff --git a/source/blender/editors/gpencil/gpencil_undo.c b/source/blender/editors/gpencil/gpencil_undo.c
new file mode 100644
index 00000000000..1154975e3cc
--- /dev/null
+++ b/source/blender/editors/gpencil/gpencil_undo.c
@@ -0,0 +1,168 @@
+/*
+ * $Id$
+ *
+ * ***** 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) 2011 Blender Foundation.
+ * All rights reserved.
+ *
+ *
+ * Contributor(s): Blender Foundation,
+ *                 Sergey Sharybin
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "MEM_guardedalloc.h"
+
+#include "DNA_gpencil_types.h"
+#include "DNA_listBase.h"
+#include "DNA_windowmanager_types.h"
+
+#include "BKE_context.h"
+#include "BKE_gpencil.h"
+
+#include "BLI_listbase.h"
+
+#include "ED_gpencil.h"
+
+#include "WM_api.h"
+#include "WM_types.h"
+
+#include "gpencil_intern.h"
+
+#define MAXUNDONAME	64
+
+typedef struct bGPundonode {
+	struct bGPundonode *next, *prev;
+
+	char name[MAXUNDONAME];
+	struct bGPdata *gpd;
+} bGPundonode;
+
+static ListBase undo_nodes = {NULL, NULL};
+static bGPundonode *cur_node = NULL;
+
+int ED_gpencil_session_active(void)
+{
+	return undo_nodes.first != NULL;
+}
+
+int ED_undo_gpencil_step(bContext *C, int step, const char *name)
+{
+	bGPdata **gpd_ptr= NULL, *new_gpd= NULL;
+
+	gpd_ptr= gpencil_data_get_pointers(C, NULL);
+
+	if(step==1) {	/* undo */
+		//printf("\t\tGP - undo step\n");
+		if(cur_node->prev) {
+			if(!name || strcmp(cur_node->name, name) == 0) {
+				cur_node= cur_node->prev;
+				new_gpd= cur_node->gpd;
+			}
+		}
+	}
+	else if (step==-1) {
+		//printf("\t\tGP - redo step\n");
+		if(cur_node->next) {
+			if(!name || strcmp(cur_node->name, name) == 0) {
+				cur_node= cur_node->next;
+				new_gpd= cur_node->gpd;
+			}
+		}
+	}
+
+	if(new_gpd) {
+		if(gpd_ptr) {
+			if(*gpd_ptr) {
+				bGPdata *gpd= *gpd_ptr;
+				bGPDlayer *gpl, *gpld;
+
+				free_gpencil_layers(&gpd->layers);
+
+				/* copy layers */
+				gpd->layers.first= gpd->layers.last= NULL;
+
+				for (gpl= new_gpd->layers.first; gpl; gpl= gpl->next) {
+					/* make a copy of source layer and its data */
+					gpld= gpencil_layer_duplicate(gpl);
+					BLI_addtail(&gpd->layers, gpld);
+				}
+			}
+		}
+	}
+
+	WM_event_add_notifier(C, NC_SCREEN|ND_GPENCIL|NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void gpencil_undo_init(bGPdata *gpd)
+{
+	gpencil_undo_push(gpd);
+}
+
+void gpencil_undo_push(bGPdata *gpd)
+{
+	bGPundonode *undo_node;
+
+	//printf("\t\tGP - undo push\n");
+
+	if(cur_node) {
+		/* remove all un-done nodes from stack */
+		undo_node= cur_node->next;
+
+		while(undo_node) {
+			bGPundonode *next_node= undo_node->next;
+
+			free_gpencil_data(undo_node->gpd);
+			MEM_freeN(undo_node->gpd);
+
+			BLI_freelinkN(&undo_nodes, undo_node);
+
+			undo_node= next_node;
+		}
+	}
+
+	/* create new undo node */
+	undo_node= MEM_callocN(sizeof(bGPundonode), "gpencil undo node");
+	undo_node->gpd= gpencil_data_duplicate(gpd);
+
+	cur_node= undo_node;
+
+	BLI_addtail(&undo_nodes, undo_node);
+}
+
+void gpencil_undo_finish(void)
+{
+	bGPundonode *undo_node= undo_nodes.first;
+
+	while(undo_node) {
+		free_gpencil_data(undo_node->gpd);
+		MEM_freeN(undo_node->gpd);
+
+		undo_node= undo_node->next;
+	}
+
+	BLI_freelistN(&undo_nodes);
+
+	cur_node= NULL;
+}
-- 
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