1 files changed, 71 insertions, 0 deletions
diff --git a/app/core/gimpdrawable-equalize.c b/app/core/gimpdrawable-equalize.c
new file mode 100644
index 0000000..202dc7f
--- /dev/null
+++ b/app/core/gimpdrawable-equalize.c
@@ -0,0 +1,71 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * 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 <gdk-pixbuf/gdk-pixbuf.h>
+#include <gegl.h>
+
+#include "core-types.h"
+
+#include "gimpdrawable.h"
+#include "gimpdrawable-equalize.h"
+#include "gimpdrawable-histogram.h"
+#include "gimpdrawable-operation.h"
+#include "gimphistogram.h"
+#include "gimpimage.h"
+#include "gimpselection.h"
+
+#include "gimp-intl.h"
+
+
+void
+gimp_drawable_equalize (GimpDrawable *drawable,
+                        gboolean      mask_only)
+{
+  GimpImage     *image;
+  GimpChannel   *selection;
+  GimpHistogram *histogram;
+  GeglNode      *equalize;
+
+  g_return_if_fail (GIMP_IS_DRAWABLE (drawable));
+  g_return_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)));
+
+  image = gimp_item_get_image (GIMP_ITEM (drawable));
+  selection = gimp_image_get_mask (image);
+
+  histogram = gimp_histogram_new (FALSE);
+  gimp_drawable_calculate_histogram (drawable, histogram, FALSE);
+
+  equalize = gegl_node_new_child (NULL,
+                                  "operation", "gimp:equalize",
+                                  "histogram", histogram,
+                                  NULL);
+
+  if (! mask_only)
+    gimp_selection_suspend (GIMP_SELECTION (selection));
+
+  gimp_drawable_apply_operation (drawable, NULL,
+                                 C_("undo-type", "Equalize"),
+                                 equalize);
+
+  if (! mask_only)
+    gimp_selection_resume (GIMP_SELECTION (selection));
+
+  g_object_unref (equalize);
+  g_object_unref (histogram);
+}