From 805d9478109e76ca221f202ff152bae685f77ff4 Mon Sep 17 00:00:00 2001
From: Habib Gahbiche <zazizizou>
Date: Mon, 29 Mar 2021 07:44:27 +0200
Subject: Compositor: Add Anti-Aliasing node

This is an implementation of Enhanced Subpixel Morphological Antialiasing (SMAA)

The algorithm was proposed by:
  Jorge Jimenez, Jose I. Echevarria, Tiago Sousa, Diego Gutierrez

This node provides only SMAA 1x mode, so the operation will be done with no spatial
multisampling nor temporal supersampling. See Patch for comparisons.

The existing AA operation seems to be used only for binary images by some other nodes.
Using SMAA for binary images needs no important parameter such as "threshold", so we
perhaps can switch the operation to SMAA, though that changes existing behavior.

Notes:
1. The program code assumes the screen coordinates are DirectX style that the
   vertical direction is upside-down, so "top" and "bottom" actually represent bottom
   and top, respectively.

Thanks for Habib Gahbiche (zazizizou) to polish and finalize this patch.

Reviewed By: jbakker

Differential Revision: https://developer.blender.org/D2411
---
 .../composite/nodes/node_composite_antialiasing.c  | 65 ++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 source/blender/nodes/composite/nodes/node_composite_antialiasing.c

(limited to 'source/blender/nodes/composite')

diff --git a/source/blender/nodes/composite/nodes/node_composite_antialiasing.c b/source/blender/nodes/composite/nodes/node_composite_antialiasing.c
new file mode 100644
index 00000000000..7437496d878
--- /dev/null
+++ b/source/blender/nodes/composite/nodes/node_composite_antialiasing.c
@@ -0,0 +1,65 @@
+/*
+ * ***** 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) 2017 Blender Foundation.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): IRIE Shinsuke
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file blender/nodes/composite/nodes/node_composite_antialiasing.c
+ *  \ingroup cmpnodes
+ */
+
+#include "node_composite_util.h"
+
+/* **************** Anti-Aliasing (SMAA 1x) ******************** */
+
+static bNodeSocketTemplate cmp_node_antialiasing_in[] = {
+    {SOCK_RGBA, N_("Image"), 1.0f, 1.0f, 1.0f, 1.0f}, {-1, ""}};
+
+static bNodeSocketTemplate cmp_node_antialiasing_out[] = {{SOCK_RGBA, N_("Image")}, {-1, ""}};
+
+static void node_composit_init_antialiasing(bNodeTree *UNUSED(ntree), bNode *node)
+{
+  NodeAntiAliasingData *data = MEM_callocN(sizeof(NodeAntiAliasingData), "node antialiasing data");
+
+  data->threshold = 1.0f;
+  data->contrast_limit = 0.2f;
+  data->corner_rounding = 0.25f;
+
+  node->storage = data;
+}
+
+void register_node_type_cmp_antialiasing(void)
+{
+  static bNodeType ntype;
+
+  cmp_node_type_base(
+      &ntype, CMP_NODE_ANTIALIASING, "Anti-Aliasing", NODE_CLASS_OP_FILTER, NODE_PREVIEW);
+  node_type_socket_templates(&ntype, cmp_node_antialiasing_in, cmp_node_antialiasing_out);
+  node_type_size(&ntype, 170, 140, 200);
+  node_type_init(&ntype, node_composit_init_antialiasing);
+  node_type_storage(
+      &ntype, "NodeAntiAliasingData", node_free_standard_storage, node_copy_standard_storage);
+
+  nodeRegisterType(&ntype);
+}
-- 
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