创建每个屏幕对应的信息条窗口

src/xcb/window.c

@@ -1,10 +1,17 @@
 #include "window.h"
 
+#include <stdbool.h>
+#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
+#include <xcb/xcb.h>
 #include <xcb/xcb_icccm.h>
+#include <xcb/xproto.h>
 
+#include "app.h"
+#include "utils.h"
 #include "xcb-private.h"
+#include "xcb.h"
 
 void set_window_class_instance(xcb_window_t window, const char *class,
                                const char *instance) {
@@ -24,3 +31,138 @@ void set_window_class_instance(xcb_window_t window, const char *class,
   xcb_icccm_set_wm_class(conn, window, length, str);
   free(str);
 }
+
+typedef struct visual_t {
+  uint8_t depth;
+  xcb_visualtype_t *visual;
+} visual_t;
+
+static visual_t *find_alpha_visual() {
+  xcb_depth_iterator_t depth_iter;
+  depth_iter = xcb_screen_allowed_depths_iterator(screen);
+  for (; depth_iter.rem; xcb_depth_next(&depth_iter)) {
+    if (depth_iter.data->depth != 32) continue;
+
+    xcb_visualtype_iterator_t visual_iter;
+    visual_iter = xcb_depth_visuals_iterator(depth_iter.data);
+    for (; visual_iter.rem; xcb_visualtype_next(&visual_iter)) {
+      if (visual_iter.data->_class == XCB_VISUAL_CLASS_TRUE_COLOR) {
+        visual_t *r = ecalloc(1, sizeof(visual_t));
+        r->visual = visual_iter.data;
+        r->depth = depth_iter.data->depth;
+        return r;
+      }
+    }
+  }
+
+  return NULL;
+}
+static visual_t *find_root_visual() {
+  xcb_depth_iterator_t depth_iter;
+  depth_iter = xcb_screen_allowed_depths_iterator(screen);
+  xcb_visualid_t vid = screen->root_visual;
+  for (; depth_iter.rem; xcb_depth_next(&depth_iter)) {
+    xcb_visualtype_iterator_t visual_iter;
+    visual_iter = xcb_depth_visuals_iterator(depth_iter.data);
+    for (; visual_iter.rem; xcb_visualtype_next(&visual_iter)) {
+      if (visual_iter.data->visual_id == vid) {
+        visual_t *r = ecalloc(1, sizeof(visual_t));
+        r->visual = visual_iter.data;
+        r->depth = depth_iter.data->depth;
+        return r;
+      }
+    }
+  }
+
+  return NULL;
+}
+
+/**
+ * @brief 获取 xcb 的 visual 及其对应的 depth
+ * @param prefer_alpha 支持 alpha 的 visual 优先
+ * @returns 返回的信息使用后记得使用 free 释放
+ */
+visual_t *get_xcb_visual(bool prefer_alpha) {
+  if (!prefer_alpha) return find_root_visual();
+
+  visual_t *visual = find_alpha_visual();
+  if (visual == NULL) visual = find_root_visual();
+
+  return visual;
+}
+
+typedef struct bar_window_param_t {
+  uint8_t depth;
+  xcb_colormap_t colormap;
+  xcb_visualid_t visual_id;
+  xcb_visualtype_t *visual;
+} bar_window_param_t;
+static bar_window_param_t *prepare_bar_window_params(void) {
+  static xcb_colormap_t colormap = XCB_NONE;
+  visual_t *visual = get_xcb_visual(true);
+  xcb_visualid_t visual_id = visual->visual->visual_id;
+  if (colormap == XCB_NONE) {
+    colormap = xcb_generate_id(conn);
+    uint8_t alloc = XCB_COLORMAP_ALLOC_NONE;
+    xcb_create_colormap(conn, alloc, colormap, screen->root, visual_id);
+  }
+
+  bar_window_param_t *params = ecalloc(1, sizeof(bar_window_param_t));
+  params->depth = visual->depth;
+  params->visual = visual->visual;
+  params->visual_id = visual_id;
+  params->colormap = colormap;
+  free(visual);
+  return params;
+}
+
+bar_cairo_params_t *create_bar_window(int16_t x, int16_t y, uint16_t width,
+                                      uint16_t height, uint32_t background_argb,
+                                      cursor_t cursor) {
+  bar_window_param_t *params = prepare_bar_window_params();
+  xcb_visualtype_t *visual = params->visual;
+  xcb_window_t window = xcb_generate_id(conn);
+  uint32_t value_mask = XCB_CW_OVERRIDE_REDIRECT | XCB_CW_BACK_PIXEL |
+                        XCB_CW_BORDER_PIXEL | XCB_CW_EVENT_MASK |
+                        XCB_CW_CURSOR | XCB_CW_COLORMAP;
+  const xcb_create_window_value_list_t value_list = {
+    .override_redirect = true,
+    .background_pixel = background_argb,
+    .border_pixel = 0,
+    .event_mask = XCB_EVENT_MASK_BUTTON_PRESS | XCB_EVENT_MASK_EXPOSURE,
+    .cursor = get_xcb_cursor(cursor),
+    .colormap = params->colormap,
+  };
+  xcb_void_cookie_t cookie;
+  cookie = xcb_create_window_aux_checked(
+    conn, params->depth, window, screen->root, x, y, width, height, 0,
+    XCB_WINDOW_CLASS_INPUT_OUTPUT, params->visual_id, value_mask, &value_list);
+  free(params);
+  if (xcb_request_check(conn, cookie)) die("create bar window:");
+
+  cookie = xcb_map_window(conn, window);
+  if (xcb_request_check(conn, cookie)) die("map bar window:");
+
+  set_window_class_instance(window, APP_NAME, APP_NAME);
+  xcb_flush(conn);
+
+  bar_cairo_params_t *p = ecalloc(1, sizeof(bar_cairo_params_t));
+  p->conn = conn;
+  p->visual = visual;
+  p->window = window;
+  return p;
+}
+
+void destroy_window(xcb_window_t window) { xcb_destroy_window(conn, window); }
+
+void change_window_cursor(xcb_window_t window, cursor_t cursor) {
+  xcb_change_window_attributes_value_list_t value_list = {
+    .cursor = get_xcb_cursor(cursor),
+  };
+  xcb_change_window_attributes_aux(conn, window, XCB_CW_CURSOR, &value_list);
+  xcb_flush(conn);
+}
+
+void set_root_cursor(cursor_t cursor) {
+  change_window_cursor(screen->root, cursor);
+}