From c311d1c5a3e555ebac575de45f635c326fce5822 Mon Sep 17 00:00:00 2001 From: Michael Stapelberg Date: Sat, 18 Nov 2017 10:44:58 +0100 Subject: [PATCH] Use RandR for learning about attached monitors MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit The code now tries the following options, in order: • obtain monitors via RandR 1.5 • obtain outputs via RandR ≤ 1.4 • obtain screens via Xinerama fixes #159 related to #101 related to #148 related to #149 --- Makefile | 4 +- README.md | 1 + i3lock.c | 18 ++-- xinerama.c | 235 +++++++++++++++++++++++++++++++++++++++++++++++++---- xinerama.h | 4 +- 5 files changed, 239 insertions(+), 23 deletions(-) diff --git a/Makefile b/Makefile index e1b6e43..c59ad0e 100644 --- a/Makefile +++ b/Makefile @@ -15,8 +15,8 @@ CFLAGS += -std=c99 CFLAGS += -pipe CFLAGS += -Wall CPPFLAGS += -D_GNU_SOURCE -CFLAGS += $(shell $(PKG_CONFIG) --cflags cairo xcb-xinerama xcb-atom xcb-image xcb-xkb xkbcommon xkbcommon-x11) -LIBS += $(shell $(PKG_CONFIG) --libs cairo xcb-xinerama xcb-atom xcb-image xcb-xkb xkbcommon xkbcommon-x11) +CFLAGS += $(shell $(PKG_CONFIG) --cflags cairo xcb-xinerama xcb-randr xcb-atom xcb-image xcb-xkb xkbcommon xkbcommon-x11) +LIBS += $(shell $(PKG_CONFIG) --libs cairo xcb-xinerama xcb-randr xcb-atom xcb-image xcb-xkb xkbcommon xkbcommon-x11) LIBS += -lev LIBS += -lm diff --git a/README.md b/README.md index 352f460..61f64d4 100644 --- a/README.md +++ b/README.md @@ -26,6 +26,7 @@ Requirements - libpam-dev - libcairo-dev - libxcb-xinerama +- libxcb-randr - libev - libx11-dev - libx11-xcb-dev diff --git a/i3lock.c b/i3lock.c index 1bb7b0c..702c6b3 100644 --- a/i3lock.c +++ b/i3lock.c @@ -36,6 +36,7 @@ #include /* explicit_bzero(3) */ #endif #include +#include #include "i3lock.h" #include "xcb.h" @@ -85,6 +86,7 @@ static struct xkb_compose_table *xkb_compose_table; static struct xkb_compose_state *xkb_compose_state; static uint8_t xkb_base_event; static uint8_t xkb_base_error; +static int randr_base = -1; cairo_surface_t *img = NULL; bool tile = false; @@ -620,7 +622,7 @@ void handle_screen_resize(void) { xcb_configure_window(conn, win, mask, last_resolution); xcb_flush(conn); - xinerama_query_screens(); + randr_query(screen->root); redraw_screen(); } @@ -743,8 +745,14 @@ static void xcb_check_cb(EV_P_ ev_check *w, int revents) { break; default: - if (type == xkb_base_event) + if (type == xkb_base_event) { process_xkb_event(event); + } + if (randr_base > -1 && + type == randr_base + XCB_RANDR_SCREEN_CHANGE_NOTIFY) { + randr_query(screen->root); + handle_screen_resize(); + } } free(event); @@ -987,11 +995,11 @@ int main(int argc, char *argv[]) { load_compose_table(locale); - xinerama_init(); - xinerama_query_screens(); - screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data; + randr_init(&randr_base, screen->root); + randr_query(screen->root); + last_resolution[0] = screen->width_in_pixels; last_resolution[1] = screen->height_in_pixels; diff --git a/xinerama.c b/xinerama.c index 3a1c756..1aceac8 100644 --- a/xinerama.c +++ b/xinerama.c @@ -12,6 +12,7 @@ #include #include #include +#include #include "i3lock.h" #include "xcb.h" @@ -21,12 +22,55 @@ int xr_screens = 0; /* The resolutions of the currently present Xinerama screens. */ -Rect *xr_resolutions; +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 _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; @@ -49,19 +93,168 @@ void xinerama_init(void) { free(reply); } -void xinerama_query_screens(void) { - if (!xinerama_active) +/* + * 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, NULL); + reply = xcb_xinerama_query_screens_reply(conn, cookie, &err); if (!reply) { - if (debug_mode) - fprintf(stderr, "Couldn't get Xinerama screens\n"); + 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); @@ -73,18 +266,32 @@ void xinerama_query_screens(void) { free(reply); return; } - xr_resolutions = resolutions; - xr_screens = screens; for (int screen = 0; screen < xr_screens; screen++) { - xr_resolutions[screen].x = screen_info[screen].x_org; - xr_resolutions[screen].y = screen_info[screen].y_org; - xr_resolutions[screen].width = screen_info[screen].width; - xr_resolutions[screen].height = screen_info[screen].height; + 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(); +} diff --git a/xinerama.h b/xinerama.h index a0de3c1..510a7cb 100644 --- a/xinerama.h +++ b/xinerama.h @@ -11,7 +11,7 @@ typedef struct Rect { extern int xr_screens; extern Rect *xr_resolutions; -void xinerama_init(void); -void xinerama_query_screens(void); +void randr_init(int *event_base, xcb_window_t root); +void randr_query(xcb_window_t root); #endif -- 2.39.2