探测屏幕信息兼容 xinerama 扩展未激活情况

src/xcb/xcb.c

@@ -1,7 +1,10 @@
 #include "xcb.h"
 
+#include <stdbool.h>
 #include <stdint.h>
+#include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <xcb/xcb.h>
 #include <xcb/xcb_aux.h>
 #include <xcb/xcb_ewmh.h>
@@ -24,6 +27,7 @@ bool has_other_wm_running(void) {
   const xcb_setup_t *setup = xcb_get_setup(conn);
   xcb_screen_iterator_t iter = xcb_setup_roots_iterator(setup);
   screen = iter.data;
+  printf("screen number: %d\n", iter.rem);
   uint32_t mask = XCB_CW_EVENT_MASK;
   xcb_params_cw_t params = {
     .event_mask = XCB_EVENT_MASK_LEAVE_WINDOW | XCB_EVENT_MASK_ENTER_WINDOW |
@@ -42,15 +46,30 @@ bool has_other_wm_running(void) {
   return false;
 }
 
-/**
- * 使用 xinerama 扩展探测每个屏幕的配置信息
- *
- * @TODO: 后续考虑兼容无 xinerama 扩展或扩展未启用的情况
- * 当前仅需函数在自己环境下能正常工作即可，先不考虑其他环境
- *
- * @note: 返回值使用完后记得释放其内存
- */
-monitor_rect_t *detect_monitor_rect(void) {
+/* xinerama 扩展是否激活 */
+static bool xinerama_active(void) {
+  const char *name = "XINERAMA";
+  xcb_query_extension_cookie_t xinerama_cookie =
+    xcb_query_extension(conn, strlen(name), name);
+  xcb_query_extension_reply_t *xinerama_reply =
+    xcb_query_extension_reply(conn, xinerama_cookie, NULL);
+
+  /* 扩展不存在 */
+  if (!xinerama_reply || !xinerama_reply->present) {
+    free(xinerama_reply);
+    return false;
+  }
+
+  xcb_xinerama_is_active_cookie_t active_cookie = xcb_xinerama_is_active(conn);
+  xcb_xinerama_is_active_reply_t *active_reply =
+    xcb_xinerama_is_active_reply(conn, active_cookie, NULL);
+  bool active = active_reply && active_reply->state;
+  free(xinerama_reply);
+  free(active_reply);
+  return active;
+}
+
+static monitor_rect_t *detect_monitor_rect_by_xinerama(void) {
   monitor_rect_t *list, *prev;
   xcb_xinerama_query_screens_cookie_t cookie = xcb_xinerama_query_screens(conn);
   xcb_xinerama_query_screens_reply_t *reply =
@@ -83,6 +102,25 @@ monitor_rect_t *detect_monitor_rect(void) {
   return list;
 }
 
+/**
+ * 探测屏幕信息
+ * @note: 返回值使用完后记得释放其内存
+ */
+monitor_rect_t *detect_monitor_rect(void) {
+  if (xinerama_active()) {
+    return detect_monitor_rect_by_xinerama();
+  }
+
+  if (!screen) return NULL;
+
+  monitor_rect_t *rect = ecalloc(1, sizeof(monitor_rect_t));
+  rect->x = 0;
+  rect->y = 0;
+  rect->width = screen->width_in_pixels;
+  rect->height = screen->height_in_pixels;
+  return rect;
+}
+
 static xcb_ewmh_connection_t *ewmh = NULL;
 static void init_ewmh_extension(void) {
   if (ewmh) return;