1 files changed, 140 insertions, 0 deletions
diff --git a/app/propgui/gimppropgui-color-to-alpha.c b/app/propgui/gimppropgui-color-to-alpha.c
new file mode 100644
index 0000000..0918bf9
--- /dev/null
+++ b/app/propgui/gimppropgui-color-to-alpha.c
@@ -0,0 +1,140 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-color-to-alpha.c
+ * Copyright (C) 2017 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-color-to-alpha.h"
+#include "gimppropgui-generic.h"
+
+#include "gimp-intl.h"
+
+
+static void
+threshold_picked (GObject       *config,
+                  gpointer       identifier,
+                  gdouble        x,
+                  gdouble        y,
+                  const Babl    *sample_format,
+                  const GimpRGB *picked_color)
+{
+  GimpRGB *color;
+  gdouble  threshold = 0.0;
+
+  g_object_get (config,
+                "color", &color,
+                NULL);
+
+  threshold = MAX (threshold, fabs (picked_color->r - color->r));
+  threshold = MAX (threshold, fabs (picked_color->g - color->g));
+  threshold = MAX (threshold, fabs (picked_color->b - color->b));
+
+  g_object_set (config,
+                identifier, threshold,
+                NULL);
+
+  g_free (color);
+}
+
+GtkWidget *
+_gimp_prop_gui_new_color_to_alpha (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;
+  GtkWidget   *button;
+  GtkWidget   *hbox;
+  GtkWidget   *scale;
+  const gchar *label;
+
+  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 = gtk_box_new (GTK_ORIENTATION_VERTICAL, 4);
+
+  button = _gimp_prop_gui_new_generic (config, param_specs, 1,
+                                       area, context, create_picker_func, NULL,
+                                       creator);
+  gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
+  gtk_widget_show (button);
+
+  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
+  gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
+  gtk_widget_show (hbox);
+
+  scale = gimp_prop_widget_new (config, "transparency-threshold",
+                                area, context, NULL, NULL, NULL, &label);
+  gtk_box_pack_start (GTK_BOX (hbox), scale, TRUE, TRUE, 0);
+  gtk_widget_show (scale);
+
+  if (create_picker_func)
+    {
+      button = create_picker_func (creator,
+                                   "transparency-threshold",
+                                   GIMP_ICON_COLOR_PICKER_GRAY,
+                                   _("Pick farthest full-transparency color"),
+                                   /* pick_abyss = */ FALSE,
+                                   (GimpPickerCallback) threshold_picked,
+                                   config);
+      gtk_box_pack_start (GTK_BOX (hbox), button, FALSE, FALSE, 0);
+      gtk_widget_show (button);
+    }
+
+  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
+  gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
+  gtk_widget_show (hbox);
+
+  scale = gimp_prop_widget_new (config, "opacity-threshold",
+                                area, context, NULL, NULL, NULL, &label);
+  gtk_box_pack_start (GTK_BOX (hbox), scale, TRUE, TRUE, 0);
+  gtk_widget_show (scale);
+
+  if (create_picker_func)
+    {
+      button = create_picker_func (creator,
+                                   "opacity-threshold",
+                                   GIMP_ICON_COLOR_PICKER_GRAY,
+                                   _("Pick nearest full-opacity color"),
+                                   /* pick_abyss = */ FALSE,
+                                   (GimpPickerCallback) threshold_picked,
+                                   config);
+      gtk_box_pack_start (GTK_BOX (hbox), button, FALSE, FALSE, 0);
+      gtk_widget_show (button);
+    }
+
+  return vbox;
+}