[gimp] app: add gimp_babl_is_bounded()

[Ell <ell src gnome org>]

commit d7f12c9d26ea4be506d6d512ebab3bb30786d7ee
Author: Ell <ell_se yahoo com>
Date:   Wed Mar 20 09:14:40 2019 -0400

    app: add gimp_babl_is_bounded()
    
    ... which takes a GimpPrecision, and determines if its values are
    bounded to the [0,1] range (which is currently only true for
    integer precisions).

 app/gegl/gimp-babl.c | 19 +++++++++++++++++++
 app/gegl/gimp-babl.h |  1 +
 2 files changed, 20 insertions(+)
---
diff --git a/app/gegl/gimp-babl.c b/app/gegl/gimp-babl.c
index 503e61bc7e..e18484e726 100644
--- a/app/gegl/gimp-babl.c
+++ b/app/gegl/gimp-babl.c
@@ -824,6 +824,25 @@ gimp_babl_is_valid (GimpImageBaseType base_type,
   g_return_val_if_reached (FALSE);
 }
 
+GimpComponentType
+gimp_babl_is_bounded (GimpPrecision precision)
+{
+  switch (gimp_babl_component_type (precision))
+    {
+    case GIMP_COMPONENT_TYPE_U8:
+    case GIMP_COMPONENT_TYPE_U16:
+    case GIMP_COMPONENT_TYPE_U32:
+      return TRUE;
+
+    case GIMP_COMPONENT_TYPE_HALF:
+    case GIMP_COMPONENT_TYPE_FLOAT:
+    case GIMP_COMPONENT_TYPE_DOUBLE:
+      return FALSE;
+    }
+
+  g_return_val_if_reached (FALSE);
+}
+
 const Babl *
 gimp_babl_format (GimpImageBaseType  base_type,
                   GimpPrecision      precision,
diff --git a/app/gegl/gimp-babl.h b/app/gegl/gimp-babl.h
index 8dfd10445a..209eea0e19 100644
--- a/app/gegl/gimp-babl.h
+++ b/app/gegl/gimp-babl.h
@@ -48,6 +48,7 @@ GimpPrecision       gimp_babl_precision        (GimpComponentType  component,
 
 gboolean            gimp_babl_is_valid         (GimpImageBaseType  base_type,
                                                 GimpPrecision      precision);
+GimpComponentType   gimp_babl_is_bounded       (GimpPrecision      precision);
 
 const Babl        * gimp_babl_format           (GimpImageBaseType  base_type,
                                                 GimpPrecision      precision,