1 files changed, 28 insertions, 0 deletions
diff --git a/libgamma_gamma_ramps16_initialise.c b/libgamma_gamma_ramps16_initialise.c
new file mode 100644
index 0000000..c1c55cb
--- /dev/null
+++ b/libgamma_gamma_ramps16_initialise.c
@@ -0,0 +1,28 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+/**
+ * Initialise a gamma ramp in the proper way that allows all adjustment
+ * methods to read from and write to it without causing segmentation violation
+ * 
+ * The input must have `red_size`, `green_size`, and `blue_size` set to the
+ * sizes of the gamma ramps that should be allocated
+ * 
+ * @param   this  The gamma ramps
+ * @return        Zero on success, -1 on allocation error, `errno` will be set accordingly
+ */
+int
+libgamma_gamma_ramps16_initialise(libgamma_gamma_ramps16_t *restrict this)
+{
+	size_t n = this->red_size + this->green_size + this->blue_size;
+#ifdef HAVE_LIBGAMMA_METHOD_LINUX_DRM
+	/* Valgrind complains about us reading uninitialize memory if we just use malloc */
+	this->red = calloc(n, sizeof(uint16_t));
+#else
+	this->red = malloc(n * sizeof(uint16_t));
+#endif
+	this->green = &this->  red[this->  red_size];
+	this->blue  = &this->green[this->green_size];
+	return this->red ? 0 : -1;
+}