Issue #3164: HEIC doesnt have color profile.

Since this requires libheif 1.4.0, released end of February 2019, this
commit should not go into the gimp-2-10 branch right now.

configure.ac

@@ -65,7 +65,7 @@ m4_define([harfbuzz_required_version], [0.9.19])
 m4_define([intltool_required_version], [0.40.1])
 m4_define([lcms_required_version], [2.8])
 m4_define([libgudev_required_version], [167])
-m4_define([libheif_required_version], [1.1.0])
+m4_define([libheif_required_version], [1.4.0])
 m4_define([liblzma_required_version], [5.0.0])
 m4_define([libmypaint_required_version], [1.3.0])
 m4_define([libpng_required_version], [1.6.25])

plug-ins/common/file-heif.c

@@ -337,6 +337,7 @@ load_image (GFile     *file,
   struct heif_error         err;
   struct heif_image_handle *handle = NULL;
   struct heif_image        *img = NULL;
+  GimpColorProfile         *profile = NULL;
   gint                      n_images;
   heif_item_id              primary;
   heif_item_id              selected_image;
@@ -478,6 +479,42 @@ load_image (GFile     *file,
      return -1;
     }
 
+  switch (heif_image_handle_get_color_profile_type (handle))
+    {
+    case heif_color_profile_type_not_present:
+      break;
+    case heif_color_profile_type_rICC:
+    case heif_color_profile_type_prof:
+      /* I am unsure, but it looks like both these types represent an
+       * ICC color profile. XXX
+       */
+        {
+          void   *profile_data;
+          size_t  profile_size;
+
+          profile_size = heif_image_handle_get_raw_color_profile_size (handle);
+          profile_data = g_malloc0 (profile_size);
+          err = heif_image_handle_get_raw_color_profile (handle, profile_data);
+
+          if (err.code)
+            g_warning ("%s: color profile loading failed and discarded.",
+                       G_STRFUNC);
+          else
+            profile = gimp_color_profile_new_from_icc_profile ((guint8 *) profile_data,
+                                                               profile_size, NULL);
+
+          g_free (profile_data);
+        }
+      break;
+    default:
+      /* heif_color_profile_type_nclx (what is that?) and any future
+       * profile type which we don't support in GIMP (yet).
+       */
+      g_warning ("%s: unknown color profile type has been discarded.",
+                 G_STRFUNC);
+      break;
+    }
+
   gimp_progress_update (0.75);
 
   width  = heif_image_get_width  (img, heif_channel_interleaved);
@@ -490,6 +527,12 @@ load_image (GFile     *file,
   image_ID = gimp_image_new (width, height, GIMP_RGB);
   gimp_image_set_filename (image_ID, g_file_get_uri (file));
 
+  if (profile)
+    {
+      gimp_image_set_color_profile (image_ID, profile);
+      g_object_unref (profile);
+    }
+
   layer_ID = gimp_layer_new (image_ID,
                              _("image content"),
                              width, height,
@@ -622,6 +665,7 @@ save_image (GFile             *file,
   struct heif_image_handle *handle;
   struct heif_writer        writer;
   struct heif_error         err;
+  GimpColorProfile         *profile = NULL;
   GOutputStream            *output;
   GeglBuffer               *buffer;
   const Babl               *format;
@@ -634,6 +678,7 @@ save_image (GFile             *file,
   gimp_progress_init_printf (_("Exporting '%s'"),
                              g_file_get_parse_name (file));
 
+  profile = gimp_image_get_effective_color_profile (image_ID);
   width   = gimp_drawable_width  (drawable_ID);
   height  = gimp_drawable_height (drawable_ID);
 
@@ -646,6 +691,16 @@ save_image (GFile             *file,
                            heif_chroma_interleaved_24bit,
                            &image);
 
+  if (profile)
+    {
+      const guint8 *icc_data;
+      gsize         icc_length;
+
+      icc_data = gimp_color_profile_get_icc_profile (profile, &icc_length);
+      heif_image_set_raw_color_profile (image, "prof", icc_data, icc_length);
+      g_object_unref (profile);
+    }
+
   heif_image_add_plane (image, heif_channel_interleaved,
                         width, height, has_alpha ? 32 : 24);