1 files changed, 35 insertions, 0 deletions
diff --git a/libgamma_quartz_cg_crtc_get_gamma_rampsf.c b/libgamma_quartz_cg_crtc_get_gamma_rampsf.c
new file mode 100644
index 0000000..a2e8056
--- /dev/null
+++ b/libgamma_quartz_cg_crtc_get_gamma_rampsf.c
@@ -0,0 +1,35 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+/**
+ * Get the current gamma ramps for a CRTC, `float` version
+ * 
+ * @param   this   The CRTC state
+ * @param   ramps  The gamma ramps to fill with the current values
+ * @return         Zero on success, otherwise (negative) the value of an
+ *                 error identifier provided by this library
+ */
+int
+libgamma_quartz_cg_crtc_get_gamma_rampsf(libgamma_crtc_state_t *restrict this, libgamma_gamma_rampsf_t *restrict ramps)
+{
+	CGDirectDisplayID *restrict crtcs = this->partition->data;
+	CGDirectDisplayID crtc_id = crtcs[this->crtc];
+	uint32_t gamma_size_out;
+	CGError r;
+#ifdef DEBUG
+	/* Gamma ramps sizes are identical but not fixed */
+	if (ramps->red_size != ramps->green_size || ramps->red_size != ramps->blue_size)
+		return LIBGAMMA_MIXED_GAMMA_RAMP_SIZE;
+#endif
+	/* Read current gamma ramps */
+	r = CGGetDisplayTransferByTable(crtc_id, (uint32_t)ramps->red_size, ramps->red, ramps->green, ramps->blue, &gamma_size_out);
+	if (r != kCGErrorSuccess)
+		return LIBGAMMA_GAMMA_RAMP_READ_FAILED;
+	/* I hope that it will not actually ever change,
+	   but it does return the the gamma ramp size despite
+	   that it can be queried without querying for more */
+	if (gamma_size_out != ramps->red_size)
+		return LIBGAMMA_GAMMA_RAMP_SIZE_CHANGED;
+	return 0;
+}