[gimp] app: add functions to switch preview side and orientation to GimpFilterOptions

[Michael Natterer <mitch src gnome org>]

commit f56df8d7dce2b930cca53cfbae5e0b32cd1a733a
Author: Michael Natterer <mitch gimp org>
Date:   Sat Mar 25 14:50:19 2017 +0100

    app: add functions to switch preview side and orientation to GimpFilterOptions

 app/tools/gimpfilteroptions.c |   59 +++++++++++++++++++++++++++++++++++++++++
 app/tools/gimpfilteroptions.h |    7 ++++-
 2 files changed, 65 insertions(+), 1 deletions(-)
---
diff --git a/app/tools/gimpfilteroptions.c b/app/tools/gimpfilteroptions.c
index ef6933a..95e025f 100644
--- a/app/tools/gimpfilteroptions.c
+++ b/app/tools/gimpfilteroptions.c
@@ -247,3 +247,62 @@ gimp_filter_options_get_property (GObject    *object,
       break;
     }
 }
+
+
+/*  public functions  */
+
+void
+gimp_filter_options_switch_preview_side (GimpFilterOptions *options)
+{
+  GimpAlignmentType alignment;
+
+  g_return_if_fail (GIMP_IS_FILTER_OPTIONS (options));
+
+  switch (options->preview_alignment)
+    {
+    case GIMP_ALIGN_LEFT:   alignment = GIMP_ALIGN_RIGHT;  break;
+    case GIMP_ALIGN_RIGHT:  alignment = GIMP_ALIGN_LEFT;   break;
+    case GIMP_ALIGN_TOP:    alignment = GIMP_ALIGN_BOTTOM; break;
+    case GIMP_ALIGN_BOTTOM: alignment = GIMP_ALIGN_TOP;    break;
+    default:
+      g_return_if_reached ();
+    }
+
+  g_object_set (options, "preview-alignment", alignment, NULL);
+}
+
+void
+gimp_filter_options_switch_preview_orientation (GimpFilterOptions *options,
+                                                gdouble            position_x,
+                                                gdouble            position_y)
+{
+  GimpAlignmentType alignment;
+  gdouble           position;
+
+  g_return_if_fail (GIMP_IS_FILTER_OPTIONS (options));
+
+  switch (options->preview_alignment)
+    {
+    case GIMP_ALIGN_LEFT:   alignment = GIMP_ALIGN_TOP;    break;
+    case GIMP_ALIGN_RIGHT:  alignment = GIMP_ALIGN_BOTTOM; break;
+    case GIMP_ALIGN_TOP:    alignment = GIMP_ALIGN_LEFT;   break;
+    case GIMP_ALIGN_BOTTOM: alignment = GIMP_ALIGN_RIGHT;  break;
+    default:
+      g_return_if_reached ();
+    }
+
+  if (alignment == GIMP_ALIGN_LEFT ||
+      alignment == GIMP_ALIGN_RIGHT)
+    {
+      position = position_x;
+    }
+  else
+    {
+      position = position_y;
+    }
+
+  g_object_set (options,
+                "preview-alignment", alignment,
+                "preview-position",  CLAMP (position, 0.0, 1.0),
+                NULL);
+}
diff --git a/app/tools/gimpfilteroptions.h b/app/tools/gimpfilteroptions.h
index 758d646..e28f420 100644
--- a/app/tools/gimpfilteroptions.h
+++ b/app/tools/gimpfilteroptions.h
@@ -53,7 +53,12 @@ struct _GimpFilterOptionsClass
 };
 
 
-GType   gimp_filter_options_get_type (void) G_GNUC_CONST;
+GType   gimp_filter_options_get_type                   (void) G_GNUC_CONST;
+
+void    gimp_filter_options_switch_preview_side        (GimpFilterOptions *options);
+void    gimp_filter_options_switch_preview_orientation (GimpFilterOptions *options,
+                                                        gdouble            position_x,
+                                                        gdouble            position_y);
 
 
 #endif /* __GIMP_FILTER_OPTIONS_H__ */