render: load cursor theme from XCURSOR_THEME and XCURSOR_SIZE

main.c

@@ -13,6 +13,7 @@
 //#include <termios.h>
 
 #include <wayland-client.h>
+#include <wayland-cursor.h>
 #include <xdg-shell.h>
 
 #define LOG_MODULE "main"
@@ -367,6 +368,40 @@ main(int argc, char *const *argv)
         goto out;
     }
 
+    /* Cursor */
+    term.wl.pointer.surface = wl_compositor_create_surface(term.wl.compositor);
+    if (term.wl.pointer.surface == NULL) {
+        LOG_ERR("failed to create cursor surface");
+        goto out;
+    }
+
+    unsigned cursor_size = 24;
+    const char *cursor_theme = getenv("XCURSOR_THEME");
+
+    {
+        const char *env_cursor_size = getenv("XCURSOR_SIZE");
+        if (env_cursor_size != NULL) {
+            unsigned size;
+            if (sscanf(env_cursor_size, "%u", &size) == 1)
+                cursor_size = size;
+        }
+    }
+
+    LOG_INFO("cursor theme: %s, size: %u", cursor_theme, cursor_size);
+
+    term.wl.pointer.theme = wl_cursor_theme_load(
+        cursor_theme, cursor_size * 1 /* backend->monitor->scale */,
+        term.wl.shm);
+    if (term.wl.pointer.theme == NULL) {
+        LOG_ERR("failed to load cursor theme");
+        return false;
+    }
+
+    term.wl.pointer.cursor = wl_cursor_theme_get_cursor(
+        term.wl.pointer.theme, "left_ptr");
+    assert(term.wl.pointer.cursor != NULL);
+    render_update_cursor_surface(&term);
+
     term.wl.surface = wl_compositor_create_surface(term.wl.compositor);
     if (term.wl.surface == NULL) {
         LOG_ERR("failed to create wayland surface");
@@ -537,6 +572,12 @@ out:
         xdg_toplevel_destroy(term.wl.xdg_toplevel);
     if (term.wl.xdg_surface != NULL)
         xdg_surface_destroy(term.wl.xdg_surface);
+    if (term.wl.pointer.theme != NULL)
+        wl_cursor_theme_destroy(term.wl.pointer.theme);
+    if (term.wl.pointer.pointer != NULL)
+        wl_pointer_destroy(term.wl.pointer.pointer);
+    if (term.wl.pointer.surface != NULL)
+        wl_surface_destroy(term.wl.pointer.surface);
     if (term.wl.surface != NULL)
         wl_surface_destroy(term.wl.surface);
     if (term.wl.shell != NULL)

render.c

@@ -3,6 +3,7 @@
 #include <string.h>
 #include <sys/ioctl.h>
 
+#include <wayland-cursor.h>
 #include <xdg-shell.h>
 
 #define LOG_MODULE "render"
@@ -530,3 +531,31 @@ render_set_title(struct terminal *term, const char *title)
 {
     xdg_toplevel_set_title(term->wl.xdg_toplevel, title);
 }
+
+void
+render_update_cursor_surface(struct terminal *term)
+{
+    if (term->wl.pointer.cursor == NULL)
+        return;
+
+    //const int scale = backend->monitor->scale;
+    const int scale = 1;
+
+    struct wl_cursor_image *image = term->wl.pointer.cursor->images[0];
+
+    wl_surface_set_buffer_scale(term->wl.pointer.surface, scale);
+
+    wl_surface_attach(
+        term->wl.pointer.surface, wl_cursor_image_get_buffer(image), 0, 0);
+
+    wl_pointer_set_cursor(
+        term->wl.pointer.pointer, term->wl.pointer.serial,
+        term->wl.pointer.surface,
+        image->hotspot_x / scale, image->hotspot_y / scale);
+
+
+    wl_surface_damage_buffer(
+        term->wl.pointer.surface, 0, 0, INT32_MAX, INT32_MAX);
+
+    wl_surface_commit(term->wl.pointer.surface);
+}

render.h

@@ -8,3 +8,4 @@ cairo_scaled_font_t *attrs_to_font(
 void grid_render(struct terminal *term);
 void render_resize(struct terminal *term, int width, int height);
 void render_set_title(struct terminal *term, const char *title);
+void render_update_cursor_surface(struct terminal *term);

terminal.h

@@ -20,6 +20,14 @@ struct wayland {
     struct wl_shm *shm;
     struct wl_seat *seat;
     struct wl_keyboard *keyboard;
+    struct {
+        struct wl_pointer *pointer;
+        uint32_t serial;
+
+        struct wl_surface *surface;
+        struct wl_cursor_theme *theme;
+        struct wl_cursor *cursor;
+    } pointer;
     struct xdg_wm_base *shell;
     struct xdg_surface *xdg_surface;
     struct xdg_toplevel *xdg_toplevel;