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randr.c
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randr.c
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/*
* vim:ts=4:sw=4:expandtab
*
* © 2010 Michael Stapelberg
*
* See LICENSE for licensing information
*
*/
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <xcb/xcb.h>
#include <xcb/xinerama.h>
#include <xcb/randr.h>
#include "i3lock.h"
#include "xcb.h"
#include "randr.h"
/* Number of Xinerama screens which are currently present. */
int xr_screens = 0;
/* The resolutions of the currently present Xinerama screens. */
Rect *xr_resolutions = NULL;
static bool xinerama_active;
static bool has_randr = false;
static bool has_randr_1_5 = false;
extern bool debug_mode;
void _xinerama_init(void);
void randr_init(int *event_base, xcb_window_t root) {
const xcb_query_extension_reply_t *extreply;
extreply = xcb_get_extension_data(conn, &xcb_randr_id);
if (!extreply->present) {
DEBUG("RandR is not present, falling back to Xinerama.\n");
_xinerama_init();
return;
}
xcb_generic_error_t *err;
xcb_randr_query_version_reply_t *randr_version =
xcb_randr_query_version_reply(
conn, xcb_randr_query_version(conn, XCB_RANDR_MAJOR_VERSION, XCB_RANDR_MINOR_VERSION), &err);
if (err != NULL) {
DEBUG("Could not query RandR version: X11 error code %d\n", err->error_code);
_xinerama_init();
return;
}
has_randr = true;
has_randr_1_5 = (randr_version->major_version >= 1) &&
(randr_version->minor_version >= 5);
free(randr_version);
if (event_base != NULL)
*event_base = extreply->first_event;
xcb_randr_select_input(conn, root,
XCB_RANDR_NOTIFY_MASK_SCREEN_CHANGE |
XCB_RANDR_NOTIFY_MASK_OUTPUT_CHANGE |
XCB_RANDR_NOTIFY_MASK_CRTC_CHANGE |
XCB_RANDR_NOTIFY_MASK_OUTPUT_PROPERTY);
xcb_flush(conn);
}
void _xinerama_init(void) {
if (!xcb_get_extension_data(conn, &xcb_xinerama_id)->present) {
DEBUG("Xinerama extension not found, disabling.\n");
return;
}
xcb_xinerama_is_active_cookie_t cookie;
xcb_xinerama_is_active_reply_t *reply;
cookie = xcb_xinerama_is_active(conn);
reply = xcb_xinerama_is_active_reply(conn, cookie, NULL);
if (!reply)
return;
if (!reply->state) {
free(reply);
return;
}
xinerama_active = true;
free(reply);
}
/*
* randr_query_outputs_15 uses RandR ≥ 1.5 to update outputs.
*
*/
static bool _randr_query_monitors_15(xcb_window_t root) {
#if XCB_RANDR_MINOR_VERSION < 5
return false;
#else
/* RandR 1.5 available at compile-time, i.e. libxcb is new enough */
if (!has_randr_1_5) {
return false;
}
/* RandR 1.5 available at run-time (supported by the server) */
DEBUG("Querying monitors using RandR 1.5\n");
xcb_generic_error_t *err;
xcb_randr_get_monitors_reply_t *monitors =
xcb_randr_get_monitors_reply(
conn, xcb_randr_get_monitors(conn, root, true), &err);
if (err != NULL) {
DEBUG("Could not get RandR monitors: X11 error code %d\n", err->error_code);
free(err);
/* Fall back to RandR ≤ 1.4 */
return false;
}
int screens = xcb_randr_get_monitors_monitors_length(monitors);
DEBUG("%d RandR monitors found (timestamp %d)\n",
screens, monitors->timestamp);
Rect *resolutions = malloc(screens * sizeof(Rect));
/* No memory? Just keep on using the old information. */
if (!resolutions) {
free(monitors);
return true;
}
xcb_randr_monitor_info_iterator_t iter;
int screen;
for (iter = xcb_randr_get_monitors_monitors_iterator(monitors), screen = 0;
iter.rem;
xcb_randr_monitor_info_next(&iter), screen++) {
const xcb_randr_monitor_info_t *monitor_info = iter.data;
resolutions[screen].x = monitor_info->x;
resolutions[screen].y = monitor_info->y;
resolutions[screen].width = monitor_info->width;
resolutions[screen].height = monitor_info->height;
DEBUG("found RandR monitor: %d x %d at %d x %d\n",
monitor_info->width, monitor_info->height,
monitor_info->x, monitor_info->y);
}
free(xr_resolutions);
xr_resolutions = resolutions;
xr_screens = screens;
free(monitors);
return true;
#endif
}
/*
* randr_query_outputs_14 uses RandR ≤ 1.4 to update outputs.
*
*/
static bool _randr_query_outputs_14(xcb_window_t root) {
if (!has_randr) {
return false;
}
DEBUG("Querying outputs using RandR ≤ 1.4\n");
/* Get screen resources (primary output, crtcs, outputs, modes) */
xcb_randr_get_screen_resources_current_cookie_t rcookie;
rcookie = xcb_randr_get_screen_resources_current(conn, root);
xcb_randr_get_screen_resources_current_reply_t *res =
xcb_randr_get_screen_resources_current_reply(conn, rcookie, NULL);
if (res == NULL) {
DEBUG("Could not query screen resources.\n");
return false;
}
/* timestamp of the configuration so that we get consistent replies to all
* requests (if the configuration changes between our different calls) */
const xcb_timestamp_t cts = res->config_timestamp;
const int len = xcb_randr_get_screen_resources_current_outputs_length(res);
/* an output is VGA-1, LVDS-1, etc. (usually physical video outputs) */
xcb_randr_output_t *randr_outputs = xcb_randr_get_screen_resources_current_outputs(res);
/* Request information for each output */
xcb_randr_get_output_info_cookie_t ocookie[len];
for (int i = 0; i < len; i++) {
ocookie[i] = xcb_randr_get_output_info(conn, randr_outputs[i], cts);
}
Rect *resolutions = malloc(len * sizeof(Rect));
/* No memory? Just keep on using the old information. */
if (!resolutions) {
free(res);
return true;
}
/* Loop through all outputs available for this X11 screen */
int screen = 0;
for (int i = 0; i < len; i++) {
xcb_randr_get_output_info_reply_t *output;
if ((output = xcb_randr_get_output_info_reply(conn, ocookie[i], NULL)) == NULL) {
continue;
}
if (output->crtc == XCB_NONE) {
free(output);
continue;
}
xcb_randr_get_crtc_info_cookie_t icookie;
xcb_randr_get_crtc_info_reply_t *crtc;
icookie = xcb_randr_get_crtc_info(conn, output->crtc, cts);
if ((crtc = xcb_randr_get_crtc_info_reply(conn, icookie, NULL)) == NULL) {
DEBUG("Skipping output: could not get CRTC (0x%08x)\n", output->crtc);
free(output);
continue;
}
resolutions[screen].x = crtc->x;
resolutions[screen].y = crtc->y;
resolutions[screen].width = crtc->width;
resolutions[screen].height = crtc->height;
DEBUG("found RandR output: %d x %d at %d x %d\n",
crtc->width, crtc->height,
crtc->x, crtc->y);
screen++;
free(crtc);
free(output);
}
free(xr_resolutions);
xr_resolutions = resolutions;
xr_screens = screen;
free(res);
return true;
}
void _xinerama_query_screens(void) {
if (!xinerama_active) {
return;
}
xcb_xinerama_query_screens_cookie_t cookie;
xcb_xinerama_query_screens_reply_t *reply;
xcb_xinerama_screen_info_t *screen_info;
xcb_generic_error_t *err;
cookie = xcb_xinerama_query_screens_unchecked(conn);
reply = xcb_xinerama_query_screens_reply(conn, cookie, &err);
if (!reply) {
DEBUG("Couldn't get Xinerama screens: X11 error code %d\n", err->error_code);
free(err);
return;
}
screen_info = xcb_xinerama_query_screens_screen_info(reply);
int screens = xcb_xinerama_query_screens_screen_info_length(reply);
Rect *resolutions = malloc(screens * sizeof(Rect));
/* No memory? Just keep on using the old information. */
if (!resolutions) {
free(reply);
return;
}
for (int screen = 0; screen < xr_screens; screen++) {
resolutions[screen].x = screen_info[screen].x_org;
resolutions[screen].y = screen_info[screen].y_org;
resolutions[screen].width = screen_info[screen].width;
resolutions[screen].height = screen_info[screen].height;
DEBUG("found Xinerama screen: %d x %d at %d x %d\n",
screen_info[screen].width, screen_info[screen].height,
screen_info[screen].x_org, screen_info[screen].y_org);
}
free(xr_resolutions);
xr_resolutions = resolutions;
xr_screens = screens;
free(reply);
}
void randr_query(xcb_window_t root) {
if (_randr_query_monitors_15(root)) {
return;
}
if (_randr_query_outputs_14(root)) {
return;
}
_xinerama_query_screens();
}