[gimp/wip/gradient-edit: 38/43] app, libgimpbase: implement blend tool gui for gradient midpoints



commit 96d32e111bfcc140ce63ca10bdcb9d0bc7464f74
Author: Ell <ell_se yahoo com>
Date:   Thu Aug 3 13:42:09 2017 -0400

    app, libgimpbase: implement blend tool gui for gradient midpoints
    
    Allows setting the midpoint's position, blending function, and
    coloring type.
    
    The midpoint can be converted to a stop, and centered, through
    editor buttons.

 app/tools/gimpblendtool-editor.c |  352 ++++++++++++++++++++++++++++++++++++--
 app/tools/gimpblendtool.h        |    6 +
 libgimpbase/gimpbaseenums.c      |   16 +-
 libgimpbase/gimpbaseenums.h      |   16 +-
 4 files changed, 363 insertions(+), 27 deletions(-)
---
diff --git a/app/tools/gimpblendtool-editor.c b/app/tools/gimpblendtool-editor.c
index 647ed1f..83f1307 100644
--- a/app/tools/gimpblendtool-editor.c
+++ b/app/tools/gimpblendtool-editor.c
@@ -103,6 +103,20 @@ static void                  gimp_blend_tool_editor_stop_se_value_changed
 static void                  gimp_blend_tool_editor_stop_delete_clicked           (GtkWidget            
*button,
                                                                                    GimpBlendTool        
*blend_tool);
 
+static void                  gimp_blend_tool_editor_midpoint_se_value_changed     (GimpSizeEntry        *se,
+                                                                                   GimpBlendTool        
*blend_tool);
+
+static void                  gimp_blend_tool_editor_midpoint_type_changed         (GtkComboBox          
*combo,
+                                                                                   GimpBlendTool        
*blend_tool);
+
+static void                  gimp_blend_tool_editor_midpoint_color_changed        (GtkComboBox          
*combo,
+                                                                                   GimpBlendTool        
*blend_tool);
+
+static void                  gimp_blend_tool_editor_midpoint_new_stop_clicked     (GtkWidget            
*button,
+                                                                                   GimpBlendTool        
*blend_tool);
+static void                  gimp_blend_tool_editor_midpoint_center_clicked       (GtkWidget            
*button,
+                                                                                   GimpBlendTool        
*blend_tool);
+
 static gboolean              gimp_blend_tool_editor_is_gradient_editable          (GimpBlendTool        
*blend_tool);
 
 static gboolean              gimp_blend_tool_editor_handle_is_endpoint            (GimpBlendTool        
*blend_tool,
@@ -125,6 +139,8 @@ static gint                  gimp_blend_tool_editor_add_stop
                                                                                    gdouble               
value);
 static void                  gimp_blend_tool_editor_delete_stop                   (GimpBlendTool        
*blend_tool,
                                                                                    gint                  
slider);
+static gint                  gimp_blend_tool_editor_midpoint_to_stop              (GimpBlendTool        
*blend_tool,
+                                                                                   gint                  
slider);
 
 static void                  gimp_blend_tool_editor_update_sliders                (GimpBlendTool        
*blend_tool);
 
@@ -136,10 +152,13 @@ static GtkWidget           * gimp_blend_tool_editor_color_entry_new
                                                                                    GtkWidget           
**type_combo);
 static void                  gimp_blend_tool_editor_init_endpoint_gui             (GimpBlendTool        
*blend_tool);
 static void                  gimp_blend_tool_editor_init_stop_gui                 (GimpBlendTool        
*blend_tool);
+static void                  gimp_blend_tool_editor_init_midpoint_gui             (GimpBlendTool        
*blend_tool);
 static void                  gimp_blend_tool_editor_update_endpoint_gui           (GimpBlendTool        
*blend_tool,
                                                                                    gint                  
selection);
 static void                  gimp_blend_tool_editor_update_stop_gui               (GimpBlendTool        
*blend_tool,
                                                                                    gint                  
selection);
+static void                  gimp_blend_tool_editor_update_midpoint_gui           (GimpBlendTool        
*blend_tool,
+                                                                                   gint                  
selection);
 static void                  gimp_blend_tool_editor_update_gui                    (GimpBlendTool        
*blend_tool);
 
 
@@ -277,19 +296,11 @@ gimp_blend_tool_editor_line_handle_clicked (GimpToolLine        *line,
       if (press_type == GIMP_BUTTON_PRESS_DOUBLE &&
           gimp_blend_tool_editor_is_gradient_editable (blend_tool))
         {
-          const GimpControllerSlider *sliders;
-          gint                        stop;
-
-          sliders = gimp_tool_line_get_sliders (line, NULL);
+          gint stop;
 
-          if (sliders[handle].value > sliders[handle].min + EPSILON &&
-              sliders[handle].value < sliders[handle].max - EPSILON)
-            {
-              stop = gimp_blend_tool_editor_add_stop (blend_tool,
-                                                      sliders[handle].value);
+          stop = gimp_blend_tool_editor_midpoint_to_stop (blend_tool, handle);
 
-              gimp_tool_line_set_selection (line, stop);
-            }
+          gimp_tool_line_set_selection (line, stop);
 
           /* return FALSE, so that the new slider can be dragged immediately */
           return FALSE;
@@ -554,6 +565,120 @@ gimp_blend_tool_editor_stop_delete_clicked (GtkWidget     *button,
   gimp_blend_tool_editor_delete_stop (blend_tool, selection);
 }
 
+static void
+gimp_blend_tool_editor_midpoint_se_value_changed (GimpSizeEntry *se,
+                                                  GimpBlendTool *blend_tool)
+{
+  gint                 selection;
+  gdouble              value;
+  GimpGradientSegment *seg;
+
+  if (gimp_blend_tool_editor_are_handlers_blocked (blend_tool))
+    return;
+
+  selection =
+    gimp_tool_line_get_selection (GIMP_TOOL_LINE (blend_tool->widget));
+
+  if (selection == GIMP_TOOL_LINE_HANDLE_NONE)
+    return;
+
+  value = gimp_size_entry_get_refval (se, 0) / 100.0;
+
+  gimp_blend_tool_editor_freeze_gradient (blend_tool);
+
+  seg = gimp_blend_tool_editor_handle_get_segment (blend_tool, selection);
+
+  seg->middle = value;
+
+  gimp_blend_tool_editor_thaw_gradient (blend_tool);
+}
+
+static void
+gimp_blend_tool_editor_midpoint_type_changed (GtkComboBox   *combo,
+                                              GimpBlendTool *blend_tool)
+{
+  gint                 selection;
+  gint                 type;
+  GimpGradientSegment *seg;
+
+  if (gimp_blend_tool_editor_are_handlers_blocked (blend_tool))
+    return;
+
+  selection =
+    gimp_tool_line_get_selection (GIMP_TOOL_LINE (blend_tool->widget));
+
+  if (! gimp_int_combo_box_get_active (GIMP_INT_COMBO_BOX (combo), &type))
+    return;
+
+  gimp_blend_tool_editor_freeze_gradient (blend_tool);
+
+  seg = gimp_blend_tool_editor_handle_get_segment (blend_tool, selection);
+
+  seg->type = type;
+
+  gimp_blend_tool_editor_thaw_gradient (blend_tool);
+}
+
+static void
+gimp_blend_tool_editor_midpoint_color_changed (GtkComboBox   *combo,
+                                               GimpBlendTool *blend_tool)
+{
+  gint                 selection;
+  gint                 color;
+  GimpGradientSegment *seg;
+
+  if (gimp_blend_tool_editor_are_handlers_blocked (blend_tool))
+    return;
+
+  selection =
+    gimp_tool_line_get_selection (GIMP_TOOL_LINE (blend_tool->widget));
+
+  if (! gimp_int_combo_box_get_active (GIMP_INT_COMBO_BOX (combo), &color))
+    return;
+
+  gimp_blend_tool_editor_freeze_gradient (blend_tool);
+
+  seg = gimp_blend_tool_editor_handle_get_segment (blend_tool, selection);
+
+  seg->color = color;
+
+  gimp_blend_tool_editor_thaw_gradient (blend_tool);
+}
+
+static void
+gimp_blend_tool_editor_midpoint_new_stop_clicked (GtkWidget     *button,
+                                                  GimpBlendTool *blend_tool)
+{
+  gint selection;
+  gint stop;
+
+  selection =
+    gimp_tool_line_get_selection (GIMP_TOOL_LINE (blend_tool->widget));
+
+  stop = gimp_blend_tool_editor_midpoint_to_stop (blend_tool, selection);
+
+  gimp_tool_line_set_selection (GIMP_TOOL_LINE (blend_tool->widget), stop);
+}
+
+static void
+gimp_blend_tool_editor_midpoint_center_clicked (GtkWidget     *button,
+                                                GimpBlendTool *blend_tool)
+{
+  gint                 selection;
+  GimpGradientSegment *seg;
+
+  selection =
+    gimp_tool_line_get_selection (GIMP_TOOL_LINE (blend_tool->widget));
+
+  gimp_blend_tool_editor_freeze_gradient (blend_tool);
+
+  seg = gimp_blend_tool_editor_handle_get_segment (blend_tool, selection);
+
+  gimp_gradient_segment_range_recenter_handles (blend_tool->gradient, seg, seg);
+
+  gimp_blend_tool_editor_thaw_gradient (blend_tool);
+}
+
 static gboolean
 gimp_blend_tool_editor_is_gradient_editable (GimpBlendTool *blend_tool)
 {
@@ -726,6 +851,25 @@ gimp_blend_tool_editor_delete_stop (GimpBlendTool *blend_tool,
   gimp_blend_tool_editor_thaw_gradient (blend_tool);
 }
 
+static gint
+gimp_blend_tool_editor_midpoint_to_stop (GimpBlendTool *blend_tool,
+                                         gint           slider)
+{
+  const GimpControllerSlider *sliders;
+
+  sliders = gimp_tool_line_get_sliders (GIMP_TOOL_LINE (blend_tool->widget),
+                                        NULL);
+
+  if (sliders[slider].value > sliders[slider].min + EPSILON &&
+      sliders[slider].value < sliders[slider].max - EPSILON)
+    {
+      slider = gimp_blend_tool_editor_add_stop (blend_tool,
+                                                sliders[slider].value);
+    }
+
+  return slider;
+}
+
 static void
 gimp_blend_tool_editor_update_sliders (GimpBlendTool *blend_tool)
 {
@@ -1122,6 +1266,126 @@ gimp_blend_tool_editor_init_stop_gui (GimpBlendTool *blend_tool)
 }
 
 static void
+gimp_blend_tool_editor_init_midpoint_gui (GimpBlendTool *blend_tool)
+{
+  GtkWidget *editor;
+  GtkWidget *table;
+  GtkWidget *label;
+  GtkWidget *se;
+  GtkWidget *combo;
+  GtkWidget *separator;
+  gint       row = 0;
+
+  /* the stop editor */
+  blend_tool->midpoint_editor =
+  editor                      = gimp_editor_new ();
+  gtk_box_pack_start (GTK_BOX (gimp_tool_gui_get_vbox (blend_tool->gui)),
+                      editor, FALSE, TRUE, 0);
+
+  /* the main table */
+  table = gtk_table_new (1, 2, FALSE);
+  gtk_table_set_row_spacings (GTK_TABLE (table), 4);
+  gtk_table_set_col_spacings (GTK_TABLE (table), 4);
+  gtk_box_pack_start (GTK_BOX (editor), table, FALSE, TRUE, 0);
+  gtk_widget_show (table);
+
+  /* the position label */
+  label = gtk_label_new (_("Position:"));
+  gtk_label_set_xalign (GTK_LABEL (label), 0.0);
+  gtk_table_attach (GTK_TABLE (table), label, 0, 1, row, row + 1,
+                    GTK_SHRINK | GTK_FILL, GTK_SHRINK, 0, 0);
+  gtk_widget_show (label);
+
+  /* the position size entry */
+  blend_tool->midpoint_se =
+  se                      = gimp_size_entry_new (1, GIMP_UNIT_PERCENT, "%a",
+                                                 FALSE, TRUE, FALSE, 6,
+                                                 GIMP_SIZE_ENTRY_UPDATE_SIZE);
+  gimp_size_entry_show_unit_menu (GIMP_SIZE_ENTRY (se), FALSE);
+  gtk_table_attach (GTK_TABLE (table), se, 1, 2, row, row + 1,
+                    GTK_SHRINK | GTK_FILL | GTK_EXPAND,
+                    GTK_SHRINK | GTK_FILL,
+                    0, 0);
+  gtk_widget_show (se);
+
+  g_signal_connect (se, "value-changed",
+                    G_CALLBACK (gimp_blend_tool_editor_midpoint_se_value_changed),
+                    blend_tool);
+
+  row++;
+
+  /* the type label */
+  label = gtk_label_new (_("Blending:"));
+  gtk_label_set_xalign (GTK_LABEL (label), 0.0);
+  gtk_table_attach (GTK_TABLE (table), label, 0, 1, row, row + 1,
+                    GTK_SHRINK | GTK_FILL, GTK_SHRINK, 0, 0);
+  gtk_widget_show (label);
+
+  /* the type combo */
+  blend_tool->midpoint_type_combo =
+  combo                           = gimp_enum_combo_box_new (GIMP_TYPE_GRADIENT_SEGMENT_TYPE);
+  gtk_table_attach (GTK_TABLE (table), combo, 1, 2, row, row + 1,
+                    GTK_SHRINK | GTK_FILL | GTK_EXPAND,
+                    GTK_SHRINK | GTK_FILL,
+                    0, 0);
+  gtk_widget_show (combo);
+
+  g_signal_connect (combo, "changed",
+                    G_CALLBACK (gimp_blend_tool_editor_midpoint_type_changed),
+                    blend_tool);
+
+  row++;
+
+  /* the color label */
+  label = gtk_label_new (_("Coloring:"));
+  gtk_label_set_xalign (GTK_LABEL (label), 0.0);
+  gtk_table_attach (GTK_TABLE (table), label, 0, 1, row, row + 1,
+                    GTK_SHRINK | GTK_FILL, GTK_SHRINK, 0, 0);
+  gtk_widget_show (label);
+
+  /* the color combo */
+  blend_tool->midpoint_color_combo =
+  combo                           = gimp_enum_combo_box_new (GIMP_TYPE_GRADIENT_SEGMENT_COLOR);
+  gtk_table_attach (GTK_TABLE (table), combo, 1, 2, row, row + 1,
+                    GTK_SHRINK | GTK_FILL | GTK_EXPAND,
+                    GTK_SHRINK | GTK_FILL,
+                    0, 0);
+  gtk_widget_show (combo);
+
+  g_signal_connect (combo, "changed",
+                    G_CALLBACK (gimp_blend_tool_editor_midpoint_color_changed),
+                    blend_tool);
+
+  row++;
+
+  /* the action buttons separator */
+  separator = gtk_hseparator_new ();
+  gtk_table_attach (GTK_TABLE (table), separator, 0, 2, row, row + 1,
+                    GTK_SHRINK | GTK_FILL | GTK_EXPAND,
+                    GTK_SHRINK | GTK_FILL,
+                    0, 0);
+  gtk_widget_show (separator);
+
+  row++;
+
+  /* the new stop button */
+  blend_tool->midpoint_new_stop_button =
+    gimp_editor_add_button (GIMP_EDITOR (editor),
+                            GIMP_ICON_DOCUMENT_NEW, _("New stop at midpoint"),
+                            NULL,
+                            G_CALLBACK (gimp_blend_tool_editor_midpoint_new_stop_clicked),
+                            NULL, blend_tool);
+
+  /* the center button */
+  blend_tool->midpoint_center_button =
+    gimp_editor_add_button (GIMP_EDITOR (editor),
+                            GIMP_ICON_CENTER_HORIZONTAL, _("Center midpoint"),
+                            NULL,
+                            G_CALLBACK (gimp_blend_tool_editor_midpoint_center_clicked),
+                            NULL, blend_tool);
+}
+
+static void
 gimp_blend_tool_editor_update_endpoint_gui (GimpBlendTool *blend_tool,
                                             gint           selection)
 {
@@ -1286,6 +1550,66 @@ gimp_blend_tool_editor_update_stop_gui (GimpBlendTool *blend_tool,
 }
 
 static void
+gimp_blend_tool_editor_update_midpoint_gui (GimpBlendTool *blend_tool,
+                                            gint           selection)
+{
+  gboolean                    editable;
+  const GimpGradientSegment  *seg;
+  gint                        index;
+  gchar                      *title;
+  gdouble                     min;
+  gdouble                     max;
+  gdouble                     value;
+  GimpGradientSegmentType     type;
+  GimpGradientSegmentColor    color;
+
+  editable = gimp_blend_tool_editor_is_gradient_editable (blend_tool);
+
+  seg = gimp_blend_tool_editor_handle_get_segment (blend_tool, selection);
+
+  index = GPOINTER_TO_INT (
+    gimp_tool_line_get_sliders (GIMP_TOOL_LINE (blend_tool->widget),
+                                NULL)[selection].data);
+
+  title = g_strdup_printf (_("Midpoint %d"), index + 1);
+
+  min   = seg->left;
+  max   = seg->right;
+  value = seg->middle;
+  type  = seg->type;
+  color = seg->color;
+
+  gimp_tool_gui_set_title (blend_tool->gui, title);
+
+  gimp_size_entry_set_refval_boundaries (GIMP_SIZE_ENTRY (blend_tool->midpoint_se),
+                                         0, 100.0 * min, 100.0 * max);
+  gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (blend_tool->midpoint_se),
+                              0, 100.0 * value);
+
+  gimp_int_combo_box_set_active (
+    GIMP_INT_COMBO_BOX (blend_tool->midpoint_type_combo), type);
+
+  gimp_int_combo_box_set_active (
+    GIMP_INT_COMBO_BOX (blend_tool->midpoint_color_combo), color);
+
+  gtk_widget_set_sensitive (blend_tool->midpoint_new_stop_button,
+                            value > min + EPSILON && value < max - EPSILON);
+  gtk_widget_set_sensitive (blend_tool->midpoint_center_button,
+                            fabs (value - (min + max) / 2.0) > EPSILON);
+
+  gtk_widget_set_sensitive (blend_tool->midpoint_se,          editable);
+  gtk_widget_set_sensitive (blend_tool->midpoint_type_combo,  editable);
+  gtk_widget_set_sensitive (blend_tool->midpoint_color_combo, editable);
+  gtk_widget_set_sensitive (
+    GTK_WIDGET (gimp_editor_get_button_box (GIMP_EDITOR (blend_tool->midpoint_editor))),
+    editable);
+
+  g_free (title);
+
+  gtk_widget_show (blend_tool->midpoint_editor);
+}
+
+static void
 gimp_blend_tool_editor_update_gui (GimpBlendTool *blend_tool)
 {
   GimpBlendOptions *options = GIMP_BLEND_TOOL_GET_OPTIONS (blend_tool);
@@ -1327,6 +1651,7 @@ gimp_blend_tool_editor_update_gui (GimpBlendTool *blend_tool)
 
               gimp_blend_tool_editor_init_endpoint_gui (blend_tool);
               gimp_blend_tool_editor_init_stop_gui     (blend_tool);
+              gimp_blend_tool_editor_init_midpoint_gui (blend_tool);
             }
 
           gimp_blend_tool_editor_block_handlers (blend_tool);
@@ -1341,6 +1666,11 @@ gimp_blend_tool_editor_update_gui (GimpBlendTool *blend_tool)
           else
             gtk_widget_hide (blend_tool->stop_editor);
 
+          if (gimp_blend_tool_editor_handle_is_midpoint (blend_tool, selection))
+            gimp_blend_tool_editor_update_midpoint_gui (blend_tool, selection);
+          else
+            gtk_widget_hide (blend_tool->midpoint_editor);
+
           gimp_blend_tool_editor_unblock_handlers (blend_tool);
 
           gimp_tool_gui_show (blend_tool->gui);
diff --git a/app/tools/gimpblendtool.h b/app/tools/gimpblendtool.h
index 1665dc3..da82eb8 100644
--- a/app/tools/gimpblendtool.h
+++ b/app/tools/gimpblendtool.h
@@ -79,6 +79,12 @@ struct _GimpBlendTool
   GtkWidget          *stop_right_color_panel;
   GtkWidget          *stop_right_type_combo;
   GtkWidget          *stop_chain_button;
+  GtkWidget          *midpoint_editor;
+  GtkWidget          *midpoint_se;
+  GtkWidget          *midpoint_type_combo;
+  GtkWidget          *midpoint_color_combo;
+  GtkWidget          *midpoint_new_stop_button;
+  GtkWidget          *midpoint_center_button;
 };
 
 struct _GimpBlendToolClass
diff --git a/libgimpbase/gimpbaseenums.c b/libgimpbase/gimpbaseenums.c
index 73ebfb6..0c12b93 100644
--- a/libgimpbase/gimpbaseenums.c
+++ b/libgimpbase/gimpbaseenums.c
@@ -641,9 +641,9 @@ gimp_gradient_segment_color_get_type (void)
 
   static const GimpEnumDesc descs[] =
   {
-    { GIMP_GRADIENT_SEGMENT_RGB, "GIMP_GRADIENT_SEGMENT_RGB", NULL },
-    { GIMP_GRADIENT_SEGMENT_HSV_CCW, "GIMP_GRADIENT_SEGMENT_HSV_CCW", NULL },
-    { GIMP_GRADIENT_SEGMENT_HSV_CW, "GIMP_GRADIENT_SEGMENT_HSV_CW", NULL },
+    { GIMP_GRADIENT_SEGMENT_RGB, NC_("gradient-segment-color", "RGB"), NULL },
+    { GIMP_GRADIENT_SEGMENT_HSV_CCW, NC_("gradient-segment-color", "HSV (ccw)"), NULL },
+    { GIMP_GRADIENT_SEGMENT_HSV_CW, NC_("gradient-segment-color", "HSV (cw)"), NULL },
     { 0, NULL, NULL }
   };
 
@@ -675,11 +675,11 @@ gimp_gradient_segment_type_get_type (void)
 
   static const GimpEnumDesc descs[] =
   {
-    { GIMP_GRADIENT_SEGMENT_LINEAR, "GIMP_GRADIENT_SEGMENT_LINEAR", NULL },
-    { GIMP_GRADIENT_SEGMENT_CURVED, "GIMP_GRADIENT_SEGMENT_CURVED", NULL },
-    { GIMP_GRADIENT_SEGMENT_SINE, "GIMP_GRADIENT_SEGMENT_SINE", NULL },
-    { GIMP_GRADIENT_SEGMENT_SPHERE_INCREASING, "GIMP_GRADIENT_SEGMENT_SPHERE_INCREASING", NULL },
-    { GIMP_GRADIENT_SEGMENT_SPHERE_DECREASING, "GIMP_GRADIENT_SEGMENT_SPHERE_DECREASING", NULL },
+    { GIMP_GRADIENT_SEGMENT_LINEAR, NC_("gradient-segment-type", "Linear"), NULL },
+    { GIMP_GRADIENT_SEGMENT_CURVED, NC_("gradient-segment-type", "Curved"), NULL },
+    { GIMP_GRADIENT_SEGMENT_SINE, NC_("gradient-segment-type", "Sinusoidal"), NULL },
+    { GIMP_GRADIENT_SEGMENT_SPHERE_INCREASING, NC_("gradient-segment-type", "Spherical (inc)"), NULL },
+    { GIMP_GRADIENT_SEGMENT_SPHERE_DECREASING, NC_("gradient-segment-type", "Spherical (dec)"), NULL },
     { 0, NULL, NULL }
   };
 
diff --git a/libgimpbase/gimpbaseenums.h b/libgimpbase/gimpbaseenums.h
index c6f5dfd..3886e2b 100644
--- a/libgimpbase/gimpbaseenums.h
+++ b/libgimpbase/gimpbaseenums.h
@@ -346,9 +346,9 @@ GType gimp_gradient_segment_color_get_type (void) G_GNUC_CONST;
 
 typedef enum
 {
-  GIMP_GRADIENT_SEGMENT_RGB,      /* normal RGB           */
-  GIMP_GRADIENT_SEGMENT_HSV_CCW,  /* counterclockwise hue */
-  GIMP_GRADIENT_SEGMENT_HSV_CW    /* clockwise hue        */
+  GIMP_GRADIENT_SEGMENT_RGB,      /*< desc="RGB"       >*/
+  GIMP_GRADIENT_SEGMENT_HSV_CCW,  /*< desc="HSV (ccw)" >*/
+  GIMP_GRADIENT_SEGMENT_HSV_CW    /*< desc="HSV (cw)"  >*/
 } GimpGradientSegmentColor;
 
 
@@ -358,11 +358,11 @@ GType gimp_gradient_segment_type_get_type (void) G_GNUC_CONST;
 
 typedef enum
 {
-  GIMP_GRADIENT_SEGMENT_LINEAR,
-  GIMP_GRADIENT_SEGMENT_CURVED,
-  GIMP_GRADIENT_SEGMENT_SINE,
-  GIMP_GRADIENT_SEGMENT_SPHERE_INCREASING,
-  GIMP_GRADIENT_SEGMENT_SPHERE_DECREASING
+  GIMP_GRADIENT_SEGMENT_LINEAR,             /*< desc="Linear"          >*/
+  GIMP_GRADIENT_SEGMENT_CURVED,             /*< desc="Curved"          >*/
+  GIMP_GRADIENT_SEGMENT_SINE,               /*< desc="Sinusoidal"      >*/
+  GIMP_GRADIENT_SEGMENT_SPHERE_INCREASING,  /*< desc="Spherical (inc)" >*/
+  GIMP_GRADIENT_SEGMENT_SPHERE_DECREASING   /*< desc="Spherical (dec)" >*/
 } GimpGradientSegmentType;
 
 


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