[gegl] variable-blur: new op in common-cxx
- From: Ell <ell src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gegl] variable-blur: new op in common-cxx
- Date: Thu, 14 May 2020 21:50:50 +0000 (UTC)
commit 5f9a19c433752af5a0bf63d4ebee454f8b2618ba
Author: Ell <ell_se yahoo com>
Date: Thu May 14 21:50:46 2020 +0300
variable-blur: new op in common-cxx
Add a new gegl:varaible-blur op, which takes an input and a mask,
and uses the mask as a per-pixel blur factor for the input. This
is currently implemened by applying a series of Gaussian blurs to
the input with increasing radii, and using gegl:piecewise-blend to
interpolate them using the mask.
The is a C op, but it lives in common-cxx so that it only gets
built if the rest of the C++ ops are built, since
gegl:piecewise-blend is one.
operations/common-cxx/meson.build | 1 +
operations/common-cxx/variable-blur.c | 190 ++++++++++++++++++++++++++++++++++
po/POTFILES.in | 1 +
3 files changed, 192 insertions(+)
---
diff --git a/operations/common-cxx/meson.build b/operations/common-cxx/meson.build
index 0a6ca2cb9..02b63ee8b 100644
--- a/operations/common-cxx/meson.build
+++ b/operations/common-cxx/meson.build
@@ -2,6 +2,7 @@
gegl_common_cxx_sources = files(
'distance-transform.cc',
'piecewise-blend.cc',
+ 'variable-blur.c',
'warp.cc',
)
diff --git a/operations/common-cxx/variable-blur.c b/operations/common-cxx/variable-blur.c
new file mode 100644
index 000000000..42f8ce23e
--- /dev/null
+++ b/operations/common-cxx/variable-blur.c
@@ -0,0 +1,190 @@
+/* This file is an image processing operation for GEGL
+ *
+ * GEGL is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * GEGL 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with GEGL; if not, see <https://www.gnu.org/licenses/>.
+ *
+ * Copyright 2020 Ell
+ */
+
+#include "config.h"
+#include <glib/gi18n-lib.h>
+#include <math.h>
+#include <stdio.h>
+
+#define MAX_LEVELS 16
+
+#ifdef GEGL_PROPERTIES
+
+property_double (radius, _("Radius"), 10.0)
+ description (_("Maximal blur radius"))
+ value_range (0.0, 1500.0)
+ ui_range (0.0, 100.0)
+ ui_gamma (2.0)
+ ui_meta ("unit", "pixel-distance")
+
+property_int (levels, _("Levels"), 8)
+ description (_("Number of blur levels"))
+ value_range (2, MAX_LEVELS)
+
+property_boolean (linear_mask, _("Linear mask"), FALSE)
+ description (_("Use linear mask values"))
+
+#else
+
+#define GEGL_OP_META
+#define GEGL_OP_NAME variable_blur
+#define GEGL_OP_C_SOURCE variable-blur.c
+
+#include "gegl-op.h"
+
+typedef struct
+{
+ GeglNode *input;
+ GeglNode *aux;
+ GeglNode *output;
+
+ GeglNode *gaussian_blur[MAX_LEVELS];
+
+ GeglNode *piecewise_blend;
+} Nodes;
+
+static void
+update (GeglOperation *operation)
+{
+ GeglProperties *o = GEGL_PROPERTIES (operation);
+ Nodes *nodes = o->user_data;
+
+ if (nodes)
+ {
+ gint i;
+
+ for (i = 1; i < o->levels; i++)
+ {
+ gegl_node_link (nodes->input, nodes->gaussian_blur[i]);
+
+ gegl_node_set (nodes->gaussian_blur[i],
+ "std-dev-x", i * o->radius / (o->levels - 1),
+ "std-dev-y", i * o->radius / (o->levels - 1),
+ NULL);
+ }
+
+ for (; i < MAX_LEVELS; i++)
+ gegl_node_disconnect (nodes->gaussian_blur[i], "input");
+ }
+}
+
+static void
+attach (GeglOperation *operation)
+{
+ GeglProperties *o = GEGL_PROPERTIES (operation);
+ Nodes *nodes;
+ gint i;
+
+ if (! o->user_data)
+ o->user_data = g_slice_new (Nodes);
+
+ nodes = o->user_data;
+
+ nodes->input = gegl_node_get_input_proxy (operation->node, "input");
+ nodes->aux = gegl_node_get_input_proxy (operation->node, "aux");
+ nodes->output = gegl_node_get_output_proxy (operation->node, "output");
+
+ nodes->piecewise_blend = gegl_node_new_child (
+ operation->node,
+ "operation", "gegl:piecewise-blend",
+ NULL);
+
+ gegl_operation_meta_redirect (operation, "levels",
+ nodes->piecewise_blend, "levels");
+ gegl_operation_meta_redirect (operation, "linear-mask",
+ nodes->piecewise_blend, "linear-mask");
+
+ gegl_operation_meta_watch_node (operation, nodes->piecewise_blend);
+
+ gegl_node_connect_to (nodes->input, "output",
+ nodes->piecewise_blend, "aux1");
+
+ for (i = 1; i < MAX_LEVELS; i++)
+ {
+ gchar aux_name[32];
+
+ nodes->gaussian_blur[i] = gegl_node_new_child (
+ operation->node,
+ "operation", "gegl:gaussian-blur",
+ NULL);
+
+ gegl_operation_meta_watch_node (operation, nodes->gaussian_blur[i]);
+
+ sprintf (aux_name, "aux%d", i + 1);
+
+ gegl_node_connect_to (nodes->gaussian_blur[i], "output",
+ nodes->piecewise_blend, aux_name);
+ }
+
+ gegl_node_link_many (nodes->aux,
+ nodes->piecewise_blend,
+ nodes->output,
+ NULL);
+
+ update (operation);
+}
+
+static void
+my_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ set_property (object, property_id, value, pspec);
+
+ update (GEGL_OPERATION (object));
+}
+
+static void
+dispose (GObject *object)
+{
+ GeglProperties *o = GEGL_PROPERTIES (object);
+
+ if (o->user_data)
+ {
+ g_slice_free (Nodes, o->user_data);
+
+ o->user_data = NULL;
+ }
+
+ G_OBJECT_CLASS (gegl_op_parent_class)->dispose (object);
+}
+
+static void
+gegl_op_class_init (GeglOpClass *klass)
+{
+ GObjectClass *object_class;
+ GeglOperationClass *operation_class;
+
+ object_class = G_OBJECT_CLASS (klass);
+ operation_class = GEGL_OPERATION_CLASS (klass);
+
+ object_class->dispose = dispose;
+ object_class->set_property = my_set_property;
+
+ operation_class->attach = attach;
+
+ gegl_operation_class_set_keys (operation_class,
+ "name", "gegl:variable-blur",
+ "title", _("Variable Blur"),
+ "categories", "blur",
+ "description", _("Blur the image by a varying amount using a mask"),
+ NULL);
+}
+
+#endif
diff --git a/po/POTFILES.in b/po/POTFILES.in
index fe0b95a2c..14653c249 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -127,6 +127,7 @@ operations/common/weighted-blend.c
operations/common/write-buffer.c
operations/common-cxx/distance-transform.cc
operations/common-cxx/piecewise-blend.cc
+operations/common-cxx/variable-blur.c
operations/common-cxx/warp.cc
operations/common-gpl3+/antialias.c
operations/common-gpl3+/apply-lens.c
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