[gimp] app: duplicate difference mode, new and legacy



commit b6be1b768e7bb3bb84df39f907451a08846e099e
Author: Øyvind Kolås <pippin gimp org>
Date:   Mon Jan 9 23:44:57 2017 +0100

    app: duplicate difference mode, new and legacy

 app/core/core-enums.c                              |    4 +-
 app/core/core-enums.h                              |    5 +-
 app/gegl/gimp-gegl-nodes.c                         |    7 +-
 app/operations/Makefile.am                         |    2 -
 app/operations/layer-modes-legacy/Makefile.am      |    4 +-
 .../gimpoperationdifferencelegacy.c}               |   62 +++++-----
 .../gimpoperationdifferencelegacy.h                |   62 +++++++++
 app/operations/layer-modes/Makefile.am             |    4 +-
 .../layer-modes/gimpoperationdifference.c          |  136 ++++++++++++++++++++
 .../gimpoperationdifference.h}                     |   35 +++---
 app/widgets/gimpwidgets-constructors.c             |    3 +-
 11 files changed, 267 insertions(+), 57 deletions(-)
---
diff --git a/app/core/core-enums.c b/app/core/core-enums.c
index d7d03cd..06a153e 100644
--- a/app/core/core-enums.c
+++ b/app/core/core-enums.c
@@ -322,6 +322,7 @@ gimp_layer_mode_get_type (void)
     { GIMP_LAYER_MODE_MULTIPLY_LINEAR, "GIMP_LAYER_MODE_MULTIPLY_LINEAR", "multiply-linear" },
     { GIMP_LAYER_MODE_DODGE, "GIMP_LAYER_MODE_DODGE", "dodge" },
     { GIMP_LAYER_MODE_SCREEN, "GIMP_LAYER_MODE_SCREEN", "screen" },
+    { GIMP_LAYER_MODE_DIFFERENCE, "GIMP_LAYER_MODE_DIFFERENCE", "difference" },
     { GIMP_LAYER_MODE_ERASE, "GIMP_LAYER_MODE_ERASE", "erase" },
     { GIMP_LAYER_MODE_REPLACE, "GIMP_LAYER_MODE_REPLACE", "replace" },
     { GIMP_LAYER_MODE_ANTI_ERASE, "GIMP_LAYER_MODE_ANTI_ERASE", "anti-erase" },
@@ -336,7 +337,7 @@ gimp_layer_mode_get_type (void)
     { GIMP_LAYER_MODE_MULTIPLY_LEGACY, NC_("layer-mode", "Multiply (legacy)"), NULL },
     { GIMP_LAYER_MODE_SCREEN_LEGACY, NC_("layer-mode", "Screen (legacy)"), NULL },
     { GIMP_LAYER_MODE_OVERLAY_LEGACY, NC_("layer-mode", "Old broken Overlay"), NULL },
-    { GIMP_LAYER_MODE_DIFFERENCE_LEGACY, NC_("layer-mode", "Difference"), NULL },
+    { GIMP_LAYER_MODE_DIFFERENCE_LEGACY, NC_("layer-mode", "Difference (legacy)"), NULL },
     { GIMP_LAYER_MODE_ADDITION_LEGACY, NC_("layer-mode", "Addition"), NULL },
     { GIMP_LAYER_MODE_SUBTRACT_LEGACY, NC_("layer-mode", "Subtract"), NULL },
     { GIMP_LAYER_MODE_DARKEN_ONLY_LEGACY, NC_("layer-mode", "Darken only"), NULL },
@@ -363,6 +364,7 @@ gimp_layer_mode_get_type (void)
     { GIMP_LAYER_MODE_MULTIPLY_LINEAR, NC_("layer-mode", "Multiply (linear)"), NULL },
     { GIMP_LAYER_MODE_DODGE, NC_("layer-mode", "Dodge"), NULL },
     { GIMP_LAYER_MODE_SCREEN, NC_("layer-mode", "Screen"), NULL },
+    { GIMP_LAYER_MODE_DIFFERENCE, NC_("layer-mode", "Difference"), NULL },
     { GIMP_LAYER_MODE_ERASE, NC_("layer-mode", "Erase"), NULL },
     { GIMP_LAYER_MODE_REPLACE, NC_("layer-mode", "Replace"), NULL },
     { GIMP_LAYER_MODE_ANTI_ERASE, NC_("layer-mode", "Anti erase"), NULL },
diff --git a/app/core/core-enums.h b/app/core/core-enums.h
index 7df91fa..ef1395d 100644
--- a/app/core/core-enums.h
+++ b/app/core/core-enums.h
@@ -158,9 +158,9 @@ typedef enum
   GIMP_LAYER_MODE_DISSOLVE,               /*< desc="Dissolve"             >*/
   GIMP_LAYER_MODE_BEHIND,                 /*< desc="Behind"               >*/
   GIMP_LAYER_MODE_MULTIPLY_LEGACY,        /*< desc="Multiply (legacy)"    >*/
-  GIMP_LAYER_MODE_SCREEN_LEGACY,          /*< desc="Screen (legacyy)"     >*/
+  GIMP_LAYER_MODE_SCREEN_LEGACY,          /*< desc="Screen (legacy)"      >*/
   GIMP_LAYER_MODE_OVERLAY_LEGACY,         /*< desc="Old broken Overlay"   >*/
-  GIMP_LAYER_MODE_DIFFERENCE_LEGACY,      /*< desc="Difference"           >*/
+  GIMP_LAYER_MODE_DIFFERENCE_LEGACY,      /*< desc="Difference (legacy)"  >*/
   GIMP_LAYER_MODE_ADDITION_LEGACY,        /*< desc="Addition"             >*/
   GIMP_LAYER_MODE_SUBTRACT_LEGACY,        /*< desc="Subtract"             >*/
   GIMP_LAYER_MODE_DARKEN_ONLY_LEGACY,     /*< desc="Darken only"          >*/
@@ -187,6 +187,7 @@ typedef enum
   GIMP_LAYER_MODE_MULTIPLY_LINEAR,        /*< desc="Multiply (linear)"    >*/
   GIMP_LAYER_MODE_DODGE,                  /*< desc="Dodge"                >*/
   GIMP_LAYER_MODE_SCREEN,                 /*< desc="Screen"               >*/
+  GIMP_LAYER_MODE_DIFFERENCE,             /*< desc="Difference"           >*/
 
   /* internal modes, not available to the PDB */
   GIMP_LAYER_MODE_ERASE      = 1000, /*< pdb-skip, desc="Erase"      >*/
diff --git a/app/gegl/gimp-gegl-nodes.c b/app/gegl/gimp-gegl-nodes.c
index 10adca8..4e370f5 100644
--- a/app/gegl/gimp-gegl-nodes.c
+++ b/app/gegl/gimp-gegl-nodes.c
@@ -183,8 +183,12 @@ gimp_gegl_mode_node_set_mode (GeglNode      *node,
       operation = "gimp:softlight-mode";
       break;
 
+    case GIMP_LAYER_MODE_DIFFERENCE:
+      operation = "gimp:difference";
+      break;
+
     case GIMP_LAYER_MODE_DIFFERENCE_LEGACY:
-      operation = "gimp:difference-mode";
+      operation = "gimp:difference-legacyy";
       break;
 
     case GIMP_LAYER_MODE_ADDITION_LEGACY:
@@ -323,6 +327,7 @@ gimp_gegl_mode_node_set_mode (GeglNode      *node,
     case GIMP_LAYER_MODE_NORMAL_NON_LINEAR:
     case GIMP_LAYER_MODE_OVERLAY_LEGACY:
     case GIMP_LAYER_MODE_DIFFERENCE_LEGACY:
+    case GIMP_LAYER_MODE_DIFFERENCE:
     case GIMP_LAYER_MODE_HSV_HUE_LEGACY:
     case GIMP_LAYER_MODE_HSV_SATURATION_LEGACY:
     case GIMP_LAYER_MODE_HSV_COLOR_LEGACY:
diff --git a/app/operations/Makefile.am b/app/operations/Makefile.am
index 9a39e8f..e76b21c 100644
--- a/app/operations/Makefile.am
+++ b/app/operations/Makefile.am
@@ -103,8 +103,6 @@ libappoperations_a_SOURCES = \
        gimpoperationbehindmode.h               \
        gimpoperationoverlaymode.c              \
        gimpoperationoverlaymode.h              \
-       gimpoperationdifferencemode.c           \
-       gimpoperationdifferencemode.h           \
        gimpoperationadditionmode.c             \
        gimpoperationadditionmode.h             \
        gimpoperationsubtractmode.c             \
diff --git a/app/operations/layer-modes-legacy/Makefile.am b/app/operations/layer-modes-legacy/Makefile.am
index f9cccf0..e3e2d7a 100644
--- a/app/operations/layer-modes-legacy/Makefile.am
+++ b/app/operations/layer-modes-legacy/Makefile.am
@@ -20,4 +20,6 @@ libapplayermodeslegacy_a_SOURCES = \
        gimpoperationdodgelegacy.c      \
        gimpoperationdodgelegacy.h      \
        gimpoperationscreenlegacy.c     \
-       gimpoperationscreenlegacy.h
+       gimpoperationscreenlegacy.h     \
+       gimpoperationdifferencelegacy.c \
+       gimpoperationdifferencelegacy.h
diff --git a/app/operations/gimpoperationdifferencemode.c 
b/app/operations/layer-modes-legacy/gimpoperationdifferencelegacy.c
similarity index 51%
rename from app/operations/gimpoperationdifferencemode.c
rename to app/operations/layer-modes-legacy/gimpoperationdifferencelegacy.c
index 64cdfbc..7b35542 100644
--- a/app/operations/gimpoperationdifferencemode.c
+++ b/app/operations/layer-modes-legacy/gimpoperationdifferencelegacy.c
@@ -23,27 +23,27 @@
 
 #include <gegl-plugin.h>
 
-#include "operations-types.h"
+#include "../operations-types.h"
 
-#include "gimpoperationdifferencemode.h"
+#include "gimpoperationdifferencelegacy.h"
 
 
-static gboolean gimp_operation_difference_mode_process (GeglOperation       *operation,
-                                                        void                *in_buf,
-                                                        void                *aux_buf,
-                                                        void                *aux2_buf,
-                                                        void                *out_buf,
-                                                        glong                samples,
-                                                        const GeglRectangle *roi,
-                                                        gint                 level);
+static gboolean gimp_operation_difference_legacy_process (GeglOperation       *operation,
+                                                          void                *in_buf,
+                                                          void                *aux_buf,
+                                                          void                *aux2_buf,
+                                                          void                *out_buf,
+                                                          glong                samples,
+                                                          const GeglRectangle *roi,
+                                                          gint                 level);
 
 
-G_DEFINE_TYPE (GimpOperationDifferenceMode, gimp_operation_difference_mode,
+G_DEFINE_TYPE (GimpOperationDifferenceLegacy, gimp_operation_difference_legacy,
                GIMP_TYPE_OPERATION_POINT_LAYER_MODE)
 
 
 static void
-gimp_operation_difference_mode_class_init (GimpOperationDifferenceModeClass *klass)
+gimp_operation_difference_legacy_class_init (GimpOperationDifferenceLegacyClass *klass)
 {
   GeglOperationClass               *operation_class;
   GeglOperationPointComposer3Class *point_class;
@@ -56,38 +56,38 @@ gimp_operation_difference_mode_class_init (GimpOperationDifferenceModeClass *kla
                                  "description", "GIMP difference mode operation",
                                  NULL);
 
-  point_class->process = gimp_operation_difference_mode_process;
+  point_class->process = gimp_operation_difference_legacy_process;
 }
 
 static void
-gimp_operation_difference_mode_init (GimpOperationDifferenceMode *self)
+gimp_operation_difference_legacy_init (GimpOperationDifferenceLegacy *self)
 {
 }
 
 static gboolean
-gimp_operation_difference_mode_process (GeglOperation       *operation,
-                                        void                *in_buf,
-                                        void                *aux_buf,
-                                        void                *aux2_buf,
-                                        void                *out_buf,
-                                        glong                samples,
-                                        const GeglRectangle *roi,
-                                        gint                 level)
+gimp_operation_difference_legacy_process (GeglOperation       *operation,
+                                          void                *in_buf,
+                                          void                *aux_buf,
+                                          void                *aux2_buf,
+                                          void                *out_buf,
+                                          glong                samples,
+                                          const GeglRectangle *roi,
+                                          gint                 level)
 {
   gfloat opacity = GIMP_OPERATION_POINT_LAYER_MODE (operation)->opacity;
 
-  return gimp_operation_difference_mode_process_pixels (in_buf, aux_buf, aux2_buf, out_buf, opacity, 
samples, roi, level);
+  return gimp_operation_difference_legacy_process_pixels (in_buf, aux_buf, aux2_buf, out_buf, opacity, 
samples, roi, level);
 }
 
 gboolean
-gimp_operation_difference_mode_process_pixels (gfloat              *in,
-                                               gfloat              *layer,
-                                               gfloat              *mask,
-                                               gfloat              *out,
-                                               gfloat               opacity,
-                                               glong                samples,
-                                               const GeglRectangle *roi,
-                                               gint                 level)
+gimp_operation_difference_legacy_process_pixels (gfloat              *in,
+                                                 gfloat              *layer,
+                                                 gfloat              *mask,
+                                                 gfloat              *out,
+                                                 gfloat               opacity,
+                                                 glong                samples,
+                                                 const GeglRectangle *roi,
+                                                 gint                 level)
 {
   const gboolean has_mask = mask != NULL;
 
diff --git a/app/operations/layer-modes-legacy/gimpoperationdifferencelegacy.h 
b/app/operations/layer-modes-legacy/gimpoperationdifferencelegacy.h
new file mode 100644
index 0000000..3d56b7f
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationdifferencelegacy.h
@@ -0,0 +1,62 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationdifferencemode.h
+ * Copyright (C) 2008 Michael Natterer <mitch gimp org>
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_DIFFERENCE_LEGACY_H__
+#define __GIMP_OPERATION_DIFFERENCE_LEGACY_H__
+
+
+#include "../gimpoperationpointlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_DIFFERENCE_LEGACY            (gimp_operation_difference_legacy_get_type ())
+#define GIMP_OPERATION_DIFFERENCE_LEGACY(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), 
GIMP_TYPE_OPERATION_DIFFERENCE_LEGACY, GimpOperationDifferenceLegacy))
+#define GIMP_OPERATION_DIFFERENCE_LEGACY_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  
GIMP_TYPE_OPERATION_DIFFERENCE_LEGACY, GimpOperationDifferenceLegacyClass))
+#define GIMP_IS_OPERATION_DIFFERENCE_LEGACY(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), 
GIMP_TYPE_OPERATION_DIFFERENCE_LEGACY))
+#define GIMP_IS_OPERATION_DIFFERENCE_LEGACY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  
GIMP_TYPE_OPERATION_DIFFERENCE_LEGACY))
+#define GIMP_OPERATION_DIFFERENCE_LEGACY_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  
GIMP_TYPE_OPERATION_DIFFERENCE_LEGACY, GimpOperationDifferenceLegacyClass))
+
+
+typedef struct _GimpOperationDifferenceLegacy      GimpOperationDifferenceLegacy;
+typedef struct _GimpOperationDifferenceLegacyClass GimpOperationDifferenceLegacyClass;
+
+struct _GimpOperationDifferenceLegacy
+{
+  GimpOperationPointLayerMode  parent_instance;
+};
+
+struct _GimpOperationDifferenceLegacyClass
+{
+  GimpOperationPointLayerModeClass  parent_class;
+};
+
+
+GType   gimp_operation_difference_legacy_get_type (void) G_GNUC_CONST;
+
+
+gboolean gimp_operation_difference_legacy_process_pixels (gfloat              *in,
+                                                          gfloat              *layer,
+                                                          gfloat              *mask,
+                                                          gfloat              *out,
+                                                          gfloat               opacity,
+                                                          glong                samples,
+                                                          const GeglRectangle *roi,
+                                                          gint                 level);
+
+#endif /* __GIMP_OPERATION_DIFFERENCE_LEGACY_H__ */
diff --git a/app/operations/layer-modes/Makefile.am b/app/operations/layer-modes/Makefile.am
index 1a49775..e1cbcd1 100644
--- a/app/operations/layer-modes/Makefile.am
+++ b/app/operations/layer-modes/Makefile.am
@@ -25,7 +25,9 @@ libapplayermodes_generic_a_sources = \
        gimpoperationmultiply.c         \
        gimpoperationmultiply.h         \
        gimpoperationscreen.c           \
-       gimpoperationscreen.h
+       gimpoperationscreen.h           \
+       gimpoperationdifference.c       \
+       gimpoperationdifference.h
 
 libapplayermodes_sse2_a_sources = \
        gimpoperationnormal-sse2.c
diff --git a/app/operations/layer-modes/gimpoperationdifference.c 
b/app/operations/layer-modes/gimpoperationdifference.c
new file mode 100644
index 0000000..fc52ca9
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationdifference.c
@@ -0,0 +1,136 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationdifferencemode.c
+ * Copyright (C) 2008 Michael Natterer <mitch gimp org>
+ *               2012 Ville Sokk <ville sokk gmail com>
+ *               2017 Øyvind Kolås <pippin gimp org>
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+
+#include "../operations-types.h"
+
+#include "gimpoperationdifference.h"
+
+
+static gboolean gimp_operation_difference_process (GeglOperation       *operation,
+                                                   void                *in_buf,
+                                                   void                *aux_buf,
+                                                   void                *aux2_buf,
+                                                   void                *out_buf,
+                                                   glong                samples,
+                                                   const GeglRectangle *roi,
+                                                   gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationDifference, gimp_operation_difference,
+               GIMP_TYPE_OPERATION_POINT_LAYER_MODE)
+
+
+static void
+gimp_operation_difference_class_init (GimpOperationDifferenceClass *klass)
+{
+  GeglOperationClass               *operation_class;
+  GeglOperationPointComposer3Class *point_class;
+
+  operation_class = GEGL_OPERATION_CLASS (klass);
+  point_class     = GEGL_OPERATION_POINT_COMPOSER3_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:difference",
+                                 "description", "GIMP difference mode operation",
+                                 NULL);
+
+  point_class->process = gimp_operation_difference_process;
+}
+
+static void
+gimp_operation_difference_init (GimpOperationDifference *self)
+{
+}
+
+static gboolean
+gimp_operation_difference_process (GeglOperation       *operation,
+                                   void                *in_buf,
+                                   void                *aux_buf,
+                                   void                *aux2_buf,
+                                   void                *out_buf,
+                                   glong                samples,
+                                   const GeglRectangle *roi,
+                                   gint                 level)
+{
+  gfloat opacity = GIMP_OPERATION_POINT_LAYER_MODE (operation)->opacity;
+
+  return gimp_operation_difference_process_pixels (in_buf, aux_buf, aux2_buf, out_buf, opacity, samples, 
roi, level);
+}
+
+gboolean
+gimp_operation_difference_process_pixels (gfloat              *in,
+                                          gfloat              *layer,
+                                          gfloat              *mask,
+                                          gfloat              *out,
+                                          gfloat               opacity,
+                                          glong                samples,
+                                          const GeglRectangle *roi,
+                                          gint                 level)
+{
+  const gboolean has_mask = mask != NULL;
+
+  while (samples--)
+    {
+      gfloat comp_alpha;
+
+      comp_alpha = layer[ALPHA] * opacity;
+      if (has_mask)
+        comp_alpha *= *mask;
+
+      if (comp_alpha != 0.0f)
+        {
+          gint   b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              gfloat comp = in[b] - layer[b];
+              comp = (comp < 0) ? -comp : comp;
+
+              out[b] = comp * comp_alpha + in[b] * (1.0 - comp_alpha);
+            }
+        }
+      else
+        {
+          gint b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = in[b];
+            }
+        }
+
+      out[ALPHA] = in[ALPHA];
+
+      in    += 4;
+      layer += 4;
+      out   += 4;
+
+      if (has_mask)
+        mask++;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/gimpoperationdifferencemode.h 
b/app/operations/layer-modes/gimpoperationdifference.h
similarity index 51%
rename from app/operations/gimpoperationdifferencemode.h
rename to app/operations/layer-modes/gimpoperationdifference.h
index 53ed098..3a3f0d6 100644
--- a/app/operations/gimpoperationdifferencemode.h
+++ b/app/operations/layer-modes/gimpoperationdifference.h
@@ -1,8 +1,9 @@
 /* GIMP - The GNU Image Manipulation Program
  * Copyright (C) 1995 Spencer Kimball and Peter Mattis
  *
- * gimpoperationdifferencemode.h
+ * gimpoperationdifference.h
  * Copyright (C) 2008 Michael Natterer <mitch gimp org>
+ *               2017 Øyvind Kolås <pippin gimp org>
  *
  * 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
@@ -18,39 +19,39 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef __GIMP_OPERATION_DIFFERENCE_MODE_H__
-#define __GIMP_OPERATION_DIFFERENCE_MODE_H__
+#ifndef __GIMP_OPERATION_DIFFERENCE_H__
+#define __GIMP_OPERATION_DIFFERENCE_H__
 
 
-#include "gimpoperationpointlayermode.h"
+#include "../gimpoperationpointlayermode.h"
 
 
-#define GIMP_TYPE_OPERATION_DIFFERENCE_MODE            (gimp_operation_difference_mode_get_type ())
-#define GIMP_OPERATION_DIFFERENCE_MODE(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), 
GIMP_TYPE_OPERATION_DIFFERENCE_MODE, GimpOperationDifferenceMode))
-#define GIMP_OPERATION_DIFFERENCE_MODE_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  
GIMP_TYPE_OPERATION_DIFFERENCE_MODE, GimpOperationDifferenceModeClass))
-#define GIMP_IS_OPERATION_DIFFERENCE_MODE(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), 
GIMP_TYPE_OPERATION_DIFFERENCE_MODE))
-#define GIMP_IS_OPERATION_DIFFERENCE_MODE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  
GIMP_TYPE_OPERATION_DIFFERENCE_MODE))
-#define GIMP_OPERATION_DIFFERENCE_MODE_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  
GIMP_TYPE_OPERATION_DIFFERENCE_MODE, GimpOperationDifferenceModeClass))
+#define GIMP_TYPE_OPERATION_DIFFERENCE            (gimp_operation_difference_get_type ())
+#define GIMP_OPERATION_DIFFERENCE(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), 
GIMP_TYPE_OPERATION_DIFFERENCE, GimpOperationDifference))
+#define GIMP_OPERATION_DIFFERENCE_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  
GIMP_TYPE_OPERATION_DIFFERENCE, GimpOperationDifferenceClass))
+#define GIMP_IS_OPERATION_DIFFERENCE(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), 
GIMP_TYPE_OPERATION_DIFFERENCE))
+#define GIMP_IS_OPERATION_DIFFERENCE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  
GIMP_TYPE_OPERATION_DIFFERENCE))
+#define GIMP_OPERATION_DIFFERENCE_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  
GIMP_TYPE_OPERATION_DIFFERENCE, GimpOperationDifferenceClass))
 
 
-typedef struct _GimpOperationDifferenceMode      GimpOperationDifferenceMode;
-typedef struct _GimpOperationDifferenceModeClass GimpOperationDifferenceModeClass;
+typedef struct _GimpOperationDifference      GimpOperationDifference;
+typedef struct _GimpOperationDifferenceClass GimpOperationDifferenceClass;
 
-struct _GimpOperationDifferenceMode
+struct _GimpOperationDifference
 {
   GimpOperationPointLayerMode  parent_instance;
 };
 
-struct _GimpOperationDifferenceModeClass
+struct _GimpOperationDifferenceClass
 {
   GimpOperationPointLayerModeClass  parent_class;
 };
 
 
-GType   gimp_operation_difference_mode_get_type (void) G_GNUC_CONST;
+GType   gimp_operation_difference_get_type (void) G_GNUC_CONST;
 
 
-gboolean gimp_operation_difference_mode_process_pixels (gfloat              *in,
+gboolean gimp_operation_difference_process_pixels (gfloat              *in,
                                                         gfloat              *layer,
                                                         gfloat              *mask,
                                                         gfloat              *out,
@@ -59,4 +60,4 @@ gboolean gimp_operation_difference_mode_process_pixels (gfloat              *in,
                                                         const GeglRectangle *roi,
                                                         gint                 level);
 
-#endif /* __GIMP_OPERATION_DIFFERENCE_MODE_H__ */
+#endif /* __GIMP_OPERATION_DIFFERENCE_H__ */
diff --git a/app/widgets/gimpwidgets-constructors.c b/app/widgets/gimpwidgets-constructors.c
index 69a4f04..77f8b14 100644
--- a/app/widgets/gimpwidgets-constructors.c
+++ b/app/widgets/gimpwidgets-constructors.c
@@ -104,7 +104,7 @@ gimp_paint_mode_menu_new (gboolean with_behind_mode,
   GtkWidget    *combo;
 
   store = gimp_enum_store_new_with_values (GIMP_TYPE_LAYER_MODE,
-                                           30,
+                                           31,
                                            GIMP_LAYER_MODE_NORMAL,
                                            GIMP_LAYER_MODE_NORMAL_NON_LINEAR,
                                            GIMP_LAYER_MODE_DISSOLVE,
@@ -126,6 +126,7 @@ gimp_paint_mode_menu_new (gboolean with_behind_mode,
                                            GIMP_LAYER_MODE_SOFTLIGHT_LEGACY,
                                            GIMP_LAYER_MODE_HARDLIGHT_LEGACY,
 
+                                           GIMP_LAYER_MODE_DIFFERENCE,
                                            GIMP_LAYER_MODE_DIFFERENCE_LEGACY,
                                            GIMP_LAYER_MODE_SUBTRACT_LEGACY,
                                            GIMP_LAYER_MODE_GRAIN_EXTRACT_LEGACY,


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