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Wayland monitor size and position
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| // gcc -o main main.c -std=gnu23 -lwayland-client | |
| #include <assert.h> | |
| #include <stdio.h> | |
| #include <string.h> | |
| #include <stdlib.h> | |
| #include <wayland-client-protocol.h> | |
| #define MAX_NAME_SIZE 512 | |
| #define MAX_MONITORS 42 | |
| typedef struct { | |
| int x, y, w, h; | |
| int scale; | |
| char name[MAX_NAME_SIZE]; | |
| struct wl_output *wl_output; | |
| } monitor_t; | |
| monitor_t monitors[MAX_MONITORS]; | |
| size_t monitor_count = 0; | |
| static void geometry(void *data, struct wl_output *wl_output, int32_t x, int32_t y, int32_t physical_width, int32_t physical_height, int32_t subpixel, const char *make, const char *model, int32_t transform) { | |
| monitors[monitor_count].x = x; | |
| monitors[monitor_count].y = y; | |
| } | |
| static void pixel_contexts(void *data, struct wl_output *wl_output, uint32_t flags, int32_t width, int32_t height, int32_t refresh) { | |
| monitors[monitor_count].w = width; | |
| monitors[monitor_count].h = height; | |
| } | |
| static void done(void *data, struct wl_output *wl_output) { | |
| monitors[monitor_count].wl_output = wl_output; | |
| monitor_count++; | |
| assert(monitor_count < MAX_MONITORS); | |
| } | |
| static void scale(void *data, struct wl_output *wl_output, int32_t factor) { | |
| monitors[monitor_count].scale = factor; | |
| } | |
| static void name(void *data, struct wl_output *wl_output, const char *name) { | |
| strncpy(monitors[monitor_count].name, name, MAX_NAME_SIZE); | |
| } | |
| static void description(void *data, struct wl_output *wl_output, const char *description) { | |
| // nop | |
| } | |
| const struct wl_output_listener listener = { | |
| geometry, | |
| pixel_contexts, | |
| done, | |
| scale, | |
| name, | |
| description | |
| }; | |
| static void interface_added(void *data, struct wl_registry *registry, uint32_t name, const char *interface, uint32_t version) { | |
| if (strcmp(interface, wl_output_interface.name) == 0) { | |
| struct wl_output *wl_output = wl_registry_bind(registry, name, &wl_output_interface, version); | |
| wl_output_add_listener(wl_output, &listener, NULL); | |
| } | |
| } | |
| static const struct wl_registry_listener registry_listener = { | |
| interface_added, | |
| }; | |
| int moncmp(const void *a, const void *b) { | |
| const monitor_t *ma = a, *mb = b; | |
| return strcmp(ma->name, mb->name); | |
| } | |
| int main(void) { | |
| struct wl_display *display = wl_display_connect(NULL); | |
| struct wl_registry *registry = wl_display_get_registry(display); | |
| wl_registry_add_listener(registry, ®istry_listener, nullptr); | |
| wl_display_roundtrip(display); | |
| while (wl_display_dispatch(display) == -1) {} | |
| for (size_t i = 0; i < monitor_count; i++) { | |
| wl_output_release(monitors[i].wl_output); | |
| } | |
| wl_registry_destroy(registry); | |
| wl_display_disconnect(display); | |
| printf("Monitor count: %zu\n", monitor_count); | |
| qsort(monitors, monitor_count, sizeof(monitors[0]), moncmp); | |
| for (size_t i = 0; i < monitor_count; i++) { | |
| monitor_t m = monitors[i]; | |
| printf("\"%s\": %dx%d at (%d,%d) (scaled by %d)\n", m.name, m.w / m.scale, m.h / m.scale, m.x, m.y, m.scale); | |
| } | |
| return 0; | |
| } |
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