app: add gegl:focus-blur to Filters -> Blur

gegl:focus-blur blurs the image around a focal point.  It can be
used to create fake depth-of-field effects.

Add a prop-gui constructor which uses a FOCUS controller to control
the focus geometry.

app/actions/filters-actions.c

@@ -354,6 +354,11 @@ static const GimpStringActionEntry filters_interactive_actions[] =
     "gegl:fattal02",
     GIMP_HELP_FILTER_FATTAL_2002 },
 
+  { "filters-focus-blur", GIMP_ICON_GEGL,
+    NC_("filters-action", "_Focus Blur..."), NULL, NULL,
+    "gegl:focus-blur",
+    GIMP_HELP_FILTER_FOCUS_BLUR },
+
   { "filters-fractal-trace", GIMP_ICON_GEGL,
     NC_("filters-action", "_Fractal Trace..."), NULL, NULL,
     "gegl:fractal-trace",
@@ -928,6 +933,7 @@ filters_actions_update (GimpActionGroup *group,
   SET_SENSITIVE ("filters-erode",                   writable);
   SET_SENSITIVE ("filters-exposure",                writable);
   SET_SENSITIVE ("filters-fattal-2002",             writable);
+  SET_SENSITIVE ("filters-focus-blur",              writable);
   SET_SENSITIVE ("filters-fractal-trace",           writable);
   SET_SENSITIVE ("filters-gaussian-blur",           writable);
   SET_SENSITIVE ("filters-gaussian-blur-selective", writable);

app/propgui/Makefile.am

@@ -33,6 +33,8 @@ libapppropgui_a_SOURCES = \
 	gimppropgui-diffraction-patterns.h	\
 	gimppropgui-eval.c			\
 	gimppropgui-eval.h			\
+	gimppropgui-focus-blur.c		\
+	gimppropgui-focus-blur.h		\
 	gimppropgui-generic.c			\
 	gimppropgui-generic.h			\
 	gimppropgui-hue-saturation.c		\

app/propgui/gimppropgui-focus-blur.c

@@ -0,0 +1,163 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-focus-blur.c
+ * Copyright (C) 2020 Ell
+ *
+ * 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 3 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, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl.h>
+#include <gtk/gtk.h>
+
+#include "libgimpmath/gimpmath.h"
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "propgui-types.h"
+
+#include "core/gimpcontext.h"
+
+#include "gimppropgui.h"
+#include "gimppropgui-generic.h"
+#include "gimppropgui-focus-blur.h"
+
+#include "gimp-intl.h"
+
+
+static void
+focus_callback (GObject       *config,
+                GeglRectangle *area,
+                GimpLimitType  type,
+                gdouble        x,
+                gdouble        y,
+                gdouble        radius,
+                gdouble        aspect_ratio,
+                gdouble        angle,
+                gdouble        inner_limit,
+                gdouble        midpoint)
+{
+  g_object_set_data_full (G_OBJECT (config), "area",
+                          g_memdup (area, sizeof (GeglRectangle)),
+                          (GDestroyNotify) g_free);
+
+  g_object_set (config,
+                "shape",        type,
+                "x",            x / area->width,
+                "y",            y / area->height,
+                "radius",       2.0 * radius / area->width,
+                "focus",        inner_limit,
+                "midpoint",     midpoint,
+                "aspect-ratio", aspect_ratio,
+                "rotation",     fmod (
+                                  fmod (angle * 180.0 / G_PI + 180.0, 360.0) +
+                                  360.0,
+                                  360.0) - 180.0,
+                NULL);
+}
+
+static void
+config_notify (GObject          *config,
+               const GParamSpec *pspec,
+               gpointer          set_data)
+{
+  GimpControllerFocusCallback  set_func;
+  GeglRectangle               *area;
+  GimpLimitType                shape;
+  gdouble                      radius;
+  gdouble                      focus;
+  gdouble                      midpoint;
+  gdouble                      x, y;
+  gdouble                      aspect_ratio;
+  gdouble                      rotation;
+
+  set_func = g_object_get_data (G_OBJECT (config), "set-func");
+  area     = g_object_get_data (G_OBJECT (config), "area");
+
+  g_object_get (config,
+                "shape",        &shape,
+                "radius",       &radius,
+                "focus",        &focus,
+                "midpoint",     &midpoint,
+                "x",            &x,
+                "y",            &y,
+                "aspect-ratio", &aspect_ratio,
+                "rotation",     &rotation,
+                NULL);
+
+  set_func (set_data, area,
+            shape,
+            x * area->width,
+            y * area->height,
+            radius * area->width / 2.0,
+            aspect_ratio,
+            rotation / 180.0 * G_PI,
+            focus,
+            midpoint);
+}
+
+GtkWidget *
+_gimp_prop_gui_new_focus_blur (GObject                  *config,
+                               GParamSpec              **param_specs,
+                               guint                     n_param_specs,
+                               GeglRectangle            *area,
+                               GimpContext              *context,
+                               GimpCreatePickerFunc      create_picker_func,
+                               GimpCreateControllerFunc  create_controller_func,
+                               gpointer                  creator)
+{
+  GtkWidget *vbox;
+
+  g_return_val_if_fail (G_IS_OBJECT (config), NULL);
+  g_return_val_if_fail (param_specs != NULL, NULL);
+  g_return_val_if_fail (n_param_specs > 0, NULL);
+  g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
+
+  vbox = _gimp_prop_gui_new_generic (config,
+                                     param_specs, n_param_specs,
+                                     area, context,
+                                     create_picker_func,
+                                     create_controller_func,
+                                     creator);
+
+
+  if (create_controller_func)
+    {
+      GCallback set_func;
+      gpointer  set_data;
+
+      set_func = create_controller_func (creator,
+                                         GIMP_CONTROLLER_TYPE_FOCUS,
+                                         _("Focus Blur: "),
+                                         (GCallback) focus_callback,
+                                         config,
+                                         &set_data);
+
+      g_object_set_data (G_OBJECT (config), "set-func", set_func);
+
+      g_object_set_data_full (G_OBJECT (config), "area",
+                              g_memdup (area, sizeof (GeglRectangle)),
+                              (GDestroyNotify) g_free);
+
+      config_notify (config, NULL, set_data);
+
+      g_signal_connect (config, "notify",
+                        G_CALLBACK (config_notify),
+                        set_data);
+    }
+
+  return vbox;
+}
+

app/propgui/gimppropgui-focus-blur.h

@@ -0,0 +1,36 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-focus-blur.h
+ * Copyright (C) 2020 Ell
+ *
+ * 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 3 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, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_PROP_GUI_FOCUS_BLUR_H__
+#define __GIMP_PROP_GUI_FOCUS_BLUR_H__
+
+
+GtkWidget *
+_gimp_prop_gui_new_focus_blur (GObject                  *config,
+                               GParamSpec              **param_specs,
+                               guint                     n_param_specs,
+                               GeglRectangle            *area,
+                               GimpContext              *context,
+                               GimpCreatePickerFunc      create_picker_func,
+                               GimpCreateControllerFunc  create_controller_func,
+                               gpointer                  creator);
+
+
+#endif /* __GIMP_PROP_GUI_FOCUS_BLUR_H__ */

app/propgui/gimppropgui.c

@@ -52,6 +52,7 @@
 #include "gimppropgui-convolution-matrix.h"
 #include "gimppropgui-diffraction-patterns.h"
 #include "gimppropgui-eval.h"
+#include "gimppropgui-focus-blur.h"
 #include "gimppropgui-generic.h"
 #include "gimppropgui-hue-saturation.h"
 #include "gimppropgui-motion-blur-circular.h"
@@ -470,6 +471,8 @@ gui_new_funcs[] =
     _gimp_prop_gui_new_channel_mixer },
   { "GimpGegl-gegl-diffraction-patterns-config",
     _gimp_prop_gui_new_diffraction_patterns },
+  { "GimpGegl-gegl-focus-blur-config",
+    _gimp_prop_gui_new_focus_blur },
   { "GimpGegl-gegl-motion-blur-circular-config",
     _gimp_prop_gui_new_motion_blur_circular },
   { "GimpGegl-gegl-motion-blur-linear-config",

app/propgui/meson.build

@@ -6,6 +6,7 @@ libapppropgui_sources = [
   'gimppropgui-convolution-matrix.c',
   'gimppropgui-diffraction-patterns.c',
   'gimppropgui-eval.c',
+  'gimppropgui-focus-blur.c',
   'gimppropgui-generic.c',
   'gimppropgui-hue-saturation.c',
   'gimppropgui-motion-blur-circular.c',

app/sanity.c

@@ -640,6 +640,7 @@ sanity_check_gegl_ops (void)
     "gegl:engrave",
     "gegl:exposure",
     "gegl:fattal02",
+    "gegl:focus-blur",
     "gegl:fractal-trace",
     "gegl:gaussian-blur",
     "gegl:gaussian-blur-selective",

app/tools/gimpgegltool.c

@@ -180,6 +180,7 @@ gimp_gegl_tool_operation_blacklisted (const gchar *name,
     "gegl:engrave",
     "gegl:exposure",
     "gegl:fattal02",
+    "gegl:focus-blur",
     "gegl:fractal-trace",
     "gegl:gaussian-blur",
     "gegl:gaussian-blur-selective",

app/widgets/gimphelp-ids.h

@@ -379,6 +379,7 @@
 #define GIMP_HELP_FILTER_ERODE                    "gimp-filter-erode"
 #define GIMP_HELP_FILTER_EXPOSURE                 "gimp-filter-exposure"
 #define GIMP_HELP_FILTER_FATTAL_2002              "gimp-filter-fattal-2002"
+#define GIMP_HELP_FILTER_FOCUS_BLUR               "gimp-filter-focus-blur"
 #define GIMP_HELP_FILTER_FRACTAL_TRACE            "gimp-filter-fractal-trace"
 #define GIMP_HELP_FILTER_GAUSSIAN_BLUR            "gimp-filter-gaussian-blur"
 #define GIMP_HELP_FILTER_GAUSSIAN_BLUR_SELECTIVE  "gimp-filter-gaussian-blur-selective"

menus/image-menu.xml.in

@@ -700,6 +700,7 @@
       <menuitem action="plug-in-reset-all" />
       <separator />
       <menu action="filters-blur-menu" name="Blur">
+	<menuitem action="filters-focus-blur" />
 	<menuitem action="filters-gaussian-blur" />
 	<menuitem action="filters-mean-curvature-blur" />
 	<menuitem action="filters-median-blur" />

po/POTFILES.in

@@ -394,6 +394,7 @@ app/propgui/gimppropgui-color-rotate.c
 app/propgui/gimppropgui-color-to-alpha.c
 app/propgui/gimppropgui-convolution-matrix.c
 app/propgui/gimppropgui-diffraction-patterns.c
+app/propgui/gimppropgui-focus-blur.c
 app/propgui/gimppropgui-generic.c
 app/propgui/gimppropgui-hue-saturation.c
 app/propgui/gimppropgui-motion-blur-circular.c