libcolord: Add cd_spectrum_set_value()

Sometimes we just want to overwrite the spectral data without duplicating.

3 files changed, 25 insertions, 0 deletions

diff --git a/lib/colord/cd-spectrum.c b/lib/colord/cd-spectrum.c
index 5623c2a..2865e3e 100644
--- a/lib/colord/cd-spectrum.c
+++ b/lib/colord/cd-spectrum.c
@@ -110,6 +110,24 @@ cd_spectrum_get_value (const CdSpectrum *spectrum, guint idx)
 }
 
 /**
+ * cd_spectrum_set_value:
+ * @spectrum: a #CdSpectrum instance.
+ * @idx: an index into the data
+ * @data: a data value
+ *
+ * Overwrites the spectrum data at a specified index.
+ *
+ * Since: 1.2.6
+ **/
+void
+cd_spectrum_set_value (CdSpectrum *spectrum, guint idx, gdouble data)
+{
+	g_return_if_fail (spectrum != NULL);
+	g_return_if_fail (idx < spectrum->data->len);
+	g_array_index (spectrum->data, gdouble, idx) = data / spectrum->norm;
+}
+
+/**
  * cd_spectrum_get_value_raw:
  * @spectrum: a #CdSpectrum instance.
  * @idx: an index into the data
diff --git a/lib/colord/cd-spectrum.h b/lib/colord/cd-spectrum.h
index f9a7308..1885d62 100644
--- a/lib/colord/cd-spectrum.h
+++ b/lib/colord/cd-spectrum.h
@@ -72,6 +72,9 @@ void		 cd_spectrum_set_end		(CdSpectrum		*spectrum,
 						 gdouble		 end);
 void		 cd_spectrum_set_norm		(CdSpectrum		*spectrum,
 						 gdouble		 norm);
+void		 cd_spectrum_set_value		(CdSpectrum		*spectrum,
+						 guint			 idx,
+						 gdouble		 data);
 void		 cd_spectrum_add_value		(CdSpectrum		*spectrum,
 						 gdouble		 data);
 CdSpectrum	*cd_spectrum_multiply		(CdSpectrum		*s1,
diff --git a/lib/colord/cd-test-private.c b/lib/colord/cd-test-private.c
index ac3c08b..337aed2 100644
--- a/lib/colord/cd-test-private.c
+++ b/lib/colord/cd-test-private.c
@@ -249,6 +249,10 @@ colord_spectrum_func (void)
 	g_assert_cmpfloat (ABS (cd_spectrum_get_value_raw (s, 1) - 0.75f), <, 0.001f);
 	g_assert_cmpfloat (ABS (cd_spectrum_get_value_raw (s, 2) - 1.f), <, 0.001f);
 
+	/* test setting of data */
+	cd_spectrum_set_value (s, 0, 10.f);
+	g_assert_cmpfloat (ABS (cd_spectrum_get_value (s, 0) - 10.0f), <, 0.001f);
+
 	cd_spectrum_free (s);
 }