Use libgamma to determine available adjustment method configuration options

Signed-off-by: Mattias Andrée <m@maandree.se>

1 files changed, 22 insertions, 2 deletions

diff --git a/src/common.h b/src/common.h
index aa929ae..578a82d 100644
--- a/src/common.h
+++ b/src/common.h
@@ -1184,14 +1184,34 @@ extern int verbose;
 /**
  * Create an initialised state object for direct gamma adjustments
  * 
- * @param   state_out  Output parameter for the state object
- * @return             0 on success, -1 on failure
+ * @param   state_out    Output parameter for the state object
+ * @param   method       libgamma constant for the adjustment method
+ * @param   method_name  redshift's name for the adjustment method
+ * @return               0 on success, -1 on failure
  * 
  * `*state_out` is set (potentially to `NULL`) on failure
  */
 int direct_create(GAMMA_STATE **state_out, int method, const char *method_name);
 
 /**
+ * Print help on options for the adjustment method using direct gamma adjustments
+ * 
+ * @param  f       Output sink
+ * @param  method  libgamma constant for the adjustment method
+ */
+void direct_print_help(FILE *f, int method);
+
+/**
+ * Configure the adjustment method using direct gamma adjustments
+ * 
+ * @param   state  State object for the adjustment method
+ * @param   key    Option to configure
+ * @param   value  Option value to set
+ * @return         0 on success, -1 on failure
+ */
+int direct_set_option(GAMMA_STATE *state, const char *key, const char *value);
+
+/**
  * Select partitions to apply adjustments to using direct gamma adjustments
  * 
  * @param   state  State object for the adjustment method