[gimp] app: add new function gimp_filter_tool_get_drawable_area()

[Michael Natterer <mitch src gnome org>]

commit a2c331011dd6c70f426667bab400b2040c931572
Author: Michael Natterer <mitch gimp org>
Date:   Mon Jul 3 00:24:09 2017 +0200

    app: add new function gimp_filter_tool_get_drawable_area()
    
    which return's the used drawable's offsets and a GeglRectangle
    where the filter is applied according to GimpFilterOptions::region
    (either the selection or the whole drawable).

 app/tools/gimpfiltertool.c |   52 ++++++++++++++++++++++++++++++++++++++++++++
 app/tools/gimpfiltertool.h |    7 ++++++
 2 files changed, 59 insertions(+), 0 deletions(-)
---
diff --git a/app/tools/gimpfiltertool.c b/app/tools/gimpfiltertool.c
index 6dd7dd5..837879c 100644
--- a/app/tools/gimpfiltertool.c
+++ b/app/tools/gimpfiltertool.c
@@ -1779,3 +1779,55 @@ gimp_filter_tool_set_widget (GimpFilterTool *filter_tool,
                               GIMP_TOOL (filter_tool)->display);
     }
 }
+
+gboolean
+gimp_filter_tool_get_drawable_area (GimpFilterTool *filter_tool,
+                                    gint           *drawable_offset_x,
+                                    gint           *drawable_offset_y,
+                                    GeglRectangle  *drawable_area)
+{
+  GimpDrawable *drawable;
+
+  g_return_val_if_fail (GIMP_IS_FILTER_TOOL (filter_tool), FALSE);
+  g_return_val_if_fail (drawable_offset_x != NULL, FALSE);
+  g_return_val_if_fail (drawable_offset_y != NULL, FALSE);
+  g_return_val_if_fail (drawable_area != NULL, FALSE);
+
+  *drawable_offset_x = 0;
+  *drawable_offset_y = 0;
+
+  drawable_area->x      = 0;
+  drawable_area->y      = 0;
+  drawable_area->width  = 1;
+  drawable_area->height = 1;
+
+  drawable = filter_tool->drawable;
+
+  if (drawable)
+    {
+      GimpFilterOptions *options = GIMP_FILTER_TOOL_GET_OPTIONS (filter_tool);
+
+      gimp_item_get_offset (GIMP_ITEM (drawable),
+                            drawable_offset_x, drawable_offset_y);
+
+      switch (options->region)
+        {
+        case GIMP_FILTER_REGION_SELECTION:
+          gimp_item_mask_intersect (GIMP_ITEM (drawable),
+                                    &drawable_area->x,
+                                    &drawable_area->y,
+                                    &drawable_area->width,
+                                    &drawable_area->height);
+          break;
+
+        case GIMP_FILTER_REGION_DRAWABLE:
+          drawable_area->width  = gimp_item_get_width  (GIMP_ITEM (drawable));
+          drawable_area->height = gimp_item_get_height (GIMP_ITEM (drawable));
+          break;
+        }
+
+      return TRUE;
+    }
+
+  return FALSE;
+}
diff --git a/app/tools/gimpfiltertool.h b/app/tools/gimpfiltertool.h
index b3671a0..37f0720 100644
--- a/app/tools/gimpfiltertool.h
+++ b/app/tools/gimpfiltertool.h
@@ -136,13 +136,20 @@ void        gimp_filter_tool_enable_color_picking  (GimpFilterTool   *filter_too
                                                     gpointer          identifier,
                                                     gboolean          pick_abyss);
 void        gimp_filter_tool_disable_color_picking (GimpFilterTool   *filter_tool);
+
 GtkWidget * gimp_filter_tool_add_color_picker      (GimpFilterTool   *filter_tool,
                                                     gpointer          identifier,
                                                     const gchar      *icon_name,
                                                     const gchar      *tooltip,
                                                     gboolean          pick_abyss);
+
 void        gimp_filter_tool_set_widget            (GimpFilterTool   *filter_tool,
                                                     GimpToolWidget   *widget);
 
+gboolean    gimp_filter_tool_get_drawable_area     (GimpFilterTool   *filter_tool,
+                                                    gint             *drawable_offset_x,
+                                                    gint             *drawable_offset_y,
+                                                    GeglRectangle    *drawable_area);
+
 
 #endif /* __GIMP_FILTER_TOOL_H__ */