misc

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

1 files changed, 40 insertions, 0 deletions

diff --git a/libgamma_x_vidmode_site_initialise.c b/libgamma_x_vidmode_site_initialise.c
new file mode 100644
index 0000000..fd4fa55
--- /dev/null
+++ b/libgamma_x_vidmode_site_initialise.c
@@ -0,0 +1,40 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+/**
+ * Initialise an allocated site state
+ * 
+ * @param   this    The site state to initialise
+ * @param   site    The site identifier, unless it is `NULL` it must a
+ *                  `free`:able. Once the state is destroyed the library
+ *                  will attempt to free it. There you should not free
+ *                  it yourself, and it must not be a string constant
+ *                  or allocate on the stack. Note however that it will
+ *                  not be free:d if this function fails.
+ * @return          Zero on success, otherwise (negative) the value of an
+ *                  error identifier provided by this library
+ */
+int
+libgamma_x_vidmode_site_initialise(libgamma_site_state_t *restrict this, char *restrict site)
+{
+	/* Connect to the display */
+	Display *restrict connection;
+	int _major, _minor, screens;
+	this->data = connection = XOpenDisplay(site);
+	if (!this->data)
+		return LIBGAMMA_OPEN_SITE_FAILED;
+	/* Query X VidMode extension protocol version */
+	if (!XF86VidModeQueryVersion(connection, &_major, &_minor)) {
+		XCloseDisplay(connection);
+		return LIBGAMMA_PROTOCOL_VERSION_QUERY_FAILED;
+	}
+	/* Query the number of available screens */
+	screens = ScreenCount(connection);
+	if (screens < 0) {
+		XCloseDisplay(connection);
+		return LIBGAMMA_NEGATIVE_PARTITION_COUNT;
+	}
+	this->partitions_available = (size_t)screens;
+	return 0;
+}