[gimp/goat-invasion] app: add gimp_drawable_get_base_type()

[Michael Natterer <mitch src gnome org>]

commit f4693ed19e0a2987d9463a472a9fb3d4d4ac5770
Author: Michael Natterer <mitch gimp org>
Date:   Sat Apr 7 01:34:44 2012 +0200

    app: add gimp_drawable_get_base_type()

 app/core/gimpdrawable.c |   33 +++++++++++++++++++++++++++++++++
 app/core/gimpdrawable.h |    1 +
 2 files changed, 34 insertions(+), 0 deletions(-)
---
diff --git a/app/core/gimpdrawable.c b/app/core/gimpdrawable.c
index dfc590e..7b47a01 100644
--- a/app/core/gimpdrawable.c
+++ b/app/core/gimpdrawable.c
@@ -1665,6 +1665,39 @@ gimp_drawable_type_with_alpha (const GimpDrawable *drawable)
   return GIMP_IMAGE_TYPE_WITH_ALPHA (gimp_drawable_type (drawable));
 }
 
+GimpImageType
+gimp_drawable_get_base_type (const GimpDrawable *drawable)
+{
+  const Babl *format;
+
+  g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), -1);
+
+  format = gegl_buffer_get_format (drawable->private->buffer);
+
+  if (format == babl_format ("Y' u8") ||
+      format == babl_format ("Y'A u8"))
+    {
+      return GIMP_GRAY;
+    }
+  else if (format == babl_format ("R'G'B' u8") ||
+           format == babl_format ("R'G'B'A u8"))
+    {
+      return GIMP_RGB;
+    }
+  else
+    {
+      GimpImage *image = gimp_item_get_image (GIMP_ITEM (drawable));
+
+      if (format == gimp_image_get_format (image, GIMP_INDEXED_IMAGE) ||
+          format == gimp_image_get_format (image, GIMP_INDEXEDA_IMAGE))
+        {
+          return GIMP_INDEXED;
+        }
+    }
+
+  g_return_val_if_reached (-1);
+}
+
 gboolean
 gimp_drawable_is_rgb (const GimpDrawable *drawable)
 {
diff --git a/app/core/gimpdrawable.h b/app/core/gimpdrawable.h
index 40055c1..f79e5e0 100644
--- a/app/core/gimpdrawable.h
+++ b/app/core/gimpdrawable.h
@@ -226,6 +226,7 @@ const Babl    * gimp_drawable_get_format_without_alpha
 gboolean        gimp_drawable_has_alpha          (const GimpDrawable *drawable);
 GimpImageType   gimp_drawable_type               (const GimpDrawable *drawable);
 GimpImageType   gimp_drawable_type_with_alpha    (const GimpDrawable *drawable);
+GimpImageType   gimp_drawable_get_base_type      (const GimpDrawable *drawable);
 gboolean        gimp_drawable_is_rgb             (const GimpDrawable *drawable);
 gboolean        gimp_drawable_is_gray            (const GimpDrawable *drawable);
 gboolean        gimp_drawable_is_indexed         (const GimpDrawable *drawable);