diff options
Diffstat (limited to 'libgamma_x_vidmode_site_initialise.c')
-rw-r--r-- | libgamma_x_vidmode_site_initialise.c | 40 |
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; +} |