创建每个屏幕对应的信息条窗口

src/CMakeLists.txt

@@ -35,7 +35,8 @@ pkg_check_modules(XCB REQUIRED
     xcb-xinerama
     xcb-xrm
 )
-pkg_check_modules(RENDERER REQUIRED imlib2)
+pkg_check_modules(RENDERER REQUIRED cairo pango pangocairo imlib2)
+pkg_check_modules(CAIRO_XCB REQUIRED cairo-xcb)
 
 add_subdirectory(xcb)
 add_subdirectory(renderer)
@@ -48,6 +49,7 @@ configure_file(
 
 target_include_directories(${APP_NAME} SYSTEM
     PRIVATE ${GLIB_INCLUDE_DIRS}
+    PRIVATE ${CAIRO_XCB_INCLUDE_DIRS}
 )
 target_include_directories(${APP_NAME}
     PRIVATE "${SOURCE_DIR}/include"
@@ -57,6 +59,7 @@ target_include_directories(${APP_NAME}
 
 target_link_libraries(${APP_NAME}
     PRIVATE ${GLIB_LIBRARIES}
+    PRIVATE ${CAIRO_XCB_LIBRARIES}
     PRIVATE ${LIB_XCB_NAME}
     PRIVATE ${LIB_RENDERER_NAME}
 )

src/config.h

@@ -68,3 +68,10 @@ const char *const active_client_name_color = "#005577";
 const char *const status_color = "#bbbbbb";
 const char *const border_color = "#444444";
 const char *const active_border_color = "#005577";
+
+const char *const default_font_family = "sans-serif, monospace";
+const uint32_t default_font_size = 10;
+const uint32_t dpi_fallback = 96;
+
+const uint32_t bar_y_padding = 1;
+const uint32_t tag_x_padding = 10;

src/include/renderer.h

@@ -8,3 +8,7 @@ uint32_t *generate_wallpaper(const wallpaper_config_t *wallpaper_config,
                              const monitor_t *monitors, const uint32_t index,
                              const uint32_t screen_width,
                              const uint32_t screen_height);
+
+uint32_t get_font_height(const char *font_family, const uint32_t font_size,
+                         const uint32_t dpi);
+void clean_pango_context(void);

src/include/types.h

@@ -24,7 +24,6 @@ struct monitor_t {
 
   /* 为了避免引入 cairo 相关头文件，这里用 void *
    * 指针代替实际的指针类型，使用时强转为相应指针类型使用即可 */
-  void *surface; /* cairo_surface_t */
   void *cr;      /* cairo_t */
 
   const layout_t *layout;

src/include/xcb.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <X11/cursorfont.h>
 #include <stdbool.h>
 #include <stdint.h>
 #include <xcb/xproto.h>
@@ -7,6 +8,28 @@
 bool has_other_wm_running(void);
 int get_xcb_connection_fd(void);
 
+typedef enum cursor_t {
+  cursor_normal = XC_left_ptr,
+  cursor_resize = XC_bottom_right_corner,
+  cursor_move = XC_fleur,
+} cursor_t;
+void change_window_cursor(xcb_window_t window, cursor_t cursor);
+void set_root_cursor(cursor_t cursor);
+
+typedef struct bar_cairo_params_t {
+  xcb_connection_t *conn;
+  xcb_window_t window;
+  xcb_visualtype_t *visual;
+} bar_cairo_params_t;
+/**
+ * @brief 创建每个屏幕的 bar 窗口
+ * @returns 返回创建 cairo surface 需要的参数，使用完记得使用 free 释放内存
+ */
+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);
+void destroy_window(xcb_window_t window);
+
 typedef struct monitor_rect_t monitor_rect_t;
 struct monitor_rect_t {
   int32_t x;

src/main.c

@@ -1,3 +1,5 @@
+#include <cairo-xcb.h>
+#include <cairo.h>
 #include <glib.h>
 #include <glibconfig.h>
 #include <stdbool.h>
@@ -23,6 +25,8 @@ static wallpaper_config_t *parse_wallpaper_config(void);
 static void free_wallpaper_config(wallpaper_config_t *wallpaper_config);
 static void init_color_set(void);
 static void parse_color(const char *hex, color_t *color);
+static void init_monitor_bar(void);
+static void get_xresource_config(void);
 static void init_xcb_event_loop(void);
 static gboolean handle_xcb_event(GIOChannel *channel, GIOCondition condition,
                                  gpointer userdata);
@@ -32,6 +36,12 @@ static monitor_t *monitors = NULL;
 static wallpaper_config_t *wallpaper_config = NULL;
 static color_set_t *color_set = NULL;
 static GMainLoop *loop = NULL;
+static char *font_family = NULL;
+static uint32_t font_size = default_font_size;
+static uint32_t dpi = dpi_fallback;
+static uint32_t bar_y_pad = bar_y_padding;
+static uint32_t tag_x_pad = tag_x_padding;
+static uint32_t bar_height = 0;
 
 /* 调试函数，开发完成后删除 */
 static void print_monitor_list_info(monitor_t *monitor_list) {
@@ -278,6 +288,48 @@ void parse_color(const char *hex, color_t *color) {
                         &color->alpha);
 }
 
+void init_monitor_bar(void) {
+  get_xresource_config();
+  uint32_t font_height = get_font_height(font_family, font_size, dpi);
+  bar_height = font_height + bar_y_pad * 2;
+  for (monitor_t *m = monitors; m; m = m->next) {
+    bar_cairo_params_t *p =
+      create_bar_window(m->monitor_x, m->monitor_y, m->monitor_width,
+                        bar_height, color_set->bar_bg.argb, cursor_normal);
+    m->window_x = m->monitor_x;
+    m->window_width = m->monitor_width;
+    m->window_y = m->monitor_y + bar_height;
+    m->window_height = m->monitor_height - bar_height;
+    m->bar_window = p->window;
+
+    cairo_surface_t *surface = cairo_xcb_surface_create(
+      p->conn, p->window, p->visual, m->monitor_width, bar_height);
+    cairo_t *cr = cairo_create(surface);
+    cairo_surface_destroy(surface);
+    free(p);
+
+    cairo_status_t status = cairo_status(cr);
+    if (status != CAIRO_STATUS_SUCCESS) {
+      die("cannot create cairo context: %s\n", cairo_status_to_string(status));
+    }
+
+    m->cr = cr;
+  }
+  printf("font height: %u, bar height: %u\n", font_height, bar_height);
+}
+
+void get_xresource_config(void) {
+  get_xresource_uint32("Xft.dpi", &dpi);
+  get_xresource_string("zswm.font_family", &font_family, default_font_family);
+  get_xresource_uint32("zswm.font_size", &font_size);
+  get_xresource_uint32("zswm.bar_y_padding", &bar_y_pad);
+  get_xresource_uint32("zswm.tag_x_padding", &tag_x_pad);
+
+  printf("dpi: %u, font family: %s, font  size: %u\n", dpi, font_family,
+         font_size);
+  clean_xresource();
+}
+
 void init_xcb_event_loop(void) {
   GIOChannel *channel = g_io_channel_unix_new(get_xcb_connection_fd());
   g_io_channel_set_encoding(channel, NULL, NULL);
@@ -298,7 +350,7 @@ gboolean handle_xcb_event(GIOChannel *channel, GIOCondition condition,
 }
 
 void cleanup(void) {
-  clean_xcb();
+  clean_pango_context();
 
   free_wallpaper_config(wallpaper_config);
   wallpaper_config = NULL;
@@ -306,6 +358,9 @@ void cleanup(void) {
   free(color_set);
   color_set = NULL;
 
+  free(font_family);
+  font_family = NULL;
+
   monitor_t *m = monitors;
   client_t *c = m->clients;
   while (m) {
@@ -315,11 +370,15 @@ void cleanup(void) {
       c = tc;
     }
     monitor_t *next_monitor = m->next;
+    if (m->cr) cairo_destroy(m->cr);
+    destroy_window(m->bar_window);
     g_strfreev(m->tags);
     free(m);
     m = next_monitor;
   }
   monitors = NULL;
+
+  clean_xcb();
 }
 
 int main(int argc, char *argv[]) {
@@ -329,6 +388,8 @@ int main(int argc, char *argv[]) {
 
   init_monitors();
   init_color_set();
+  init_monitor_bar();
+  set_root_cursor(cursor_normal);
   init_wallpaper();
 
   window_list_t *window_list = scan_window_list();

src/renderer/CMakeLists.txt

@@ -1,7 +1,7 @@
 set(LIB_RENDERER "zswm-renderer")
 set(LIB_RENDERER_NAME ${LIB_RENDERER} PARENT_SCOPE)
 
-add_library(${LIB_RENDERER} STATIC image.c)
+add_library(${LIB_RENDERER} STATIC image.c text.c)
 target_include_directories(${LIB_RENDERER} SYSTEM
     PRIVATE ${RENDERER_INCLUDE_DIRS}
 )

src/renderer/text.c

@@ -0,0 +1,51 @@
+#include <glib-object.h>
+#include <pango/pango-attributes.h>
+#include <pango/pango-context.h>
+#include <pango/pango-font.h>
+#include <pango/pango-fontmap.h>
+#include <pango/pango-layout.h>
+#include <pango/pango-types.h>
+#include <pango/pangocairo.h>
+#include <stdint.h>
+#include <stdio.h>
+
+#include "renderer.h"
+
+static PangoContext *context = NULL;
+
+uint32_t get_font_height(const char *font_family, const uint32_t font_size,
+                         const uint32_t dpi) {
+  clean_pango_context();
+
+  PangoFontMap *fontmap = pango_cairo_font_map_new();
+  context = pango_font_map_create_context(fontmap);
+
+  pango_cairo_context_set_resolution(context, dpi);
+  PangoLanguage *lang = pango_context_get_language(context);
+  PangoAttrList *attr_list = pango_attr_list_new();
+
+  PangoFontDescription *desc = pango_font_description_from_string(font_family);
+  pango_font_description_set_size(desc, font_size * PANGO_SCALE);
+
+  PangoAttribute *attr = pango_attr_font_desc_new(desc);
+  pango_attr_list_insert(attr_list, attr);
+  pango_attr_list_unref(attr_list);
+
+  PangoFontMetrics *metrics = pango_context_get_metrics(context, desc, lang);
+  int ascent = pango_font_metrics_get_ascent(metrics);
+  int descent = pango_font_metrics_get_descent(metrics);
+  uint32_t font_height = PANGO_PIXELS(ascent + descent);
+
+  pango_font_metrics_unref(metrics);
+  pango_font_description_free(desc);
+  g_object_unref(fontmap);
+
+  return font_height;
+}
+
+void clean_pango_context(void) {
+  if (!context) return;
+
+  g_object_unref(context);
+  context = NULL;
+}

src/xcb/CMakeLists.txt

@@ -1,7 +1,7 @@
 set(LIB_XCB "zswm-xcb")
 set(LIB_XCB_NAME ${LIB_XCB} PARENT_SCOPE)
 
-add_library(${LIB_XCB} STATIC xcb.c window.c res.c)
+add_library(${LIB_XCB} STATIC xcb.c window.c res.c cursor.c)
 
 target_include_directories(${LIB_XCB} SYSTEM
     PRIVATE ${XCB_INCLUDE_DIRS}

src/xcb/cursor.c

@@ -0,0 +1,116 @@
+#include <X11/cursorfont.h>
+#include <xcb/xcb_cursor.h>
+
+#include "utils.h"
+#include "xcb-private.h"
+#include "xcb.h"
+
+static const char *const xcursor_font[] = {
+  [XC_X_cursor] = "X_cursor",
+  [XC_arrow] = "arrow",
+  [XC_based_arrow_down] = "based_arrow_down",
+  [XC_based_arrow_up] = "based_arrow_up",
+  [XC_boat] = "boat",
+  [XC_bogosity] = "bogosity",
+  [XC_bottom_left_corner] = "bottom_left_corner",
+  [XC_bottom_right_corner] = "bottom_right_corner",
+  [XC_bottom_side] = "bottom_side",
+  [XC_bottom_tee] = "bottom_tee",
+  [XC_box_spiral] = "box_spiral",
+  [XC_center_ptr] = "center_ptr",
+  [XC_circle] = "circle",
+  [XC_clock] = "clock",
+  [XC_coffee_mug] = "coffee_mug",
+  [XC_cross] = "cross",
+  [XC_cross_reverse] = "cross_reverse",
+  [XC_crosshair] = "crosshair",
+  [XC_diamond_cross] = "diamond_cross",
+  [XC_dot] = "dot",
+  [XC_dotbox] = "dotbox",
+  [XC_double_arrow] = "double_arrow",
+  [XC_draft_large] = "draft_large",
+  [XC_draft_small] = "draft_small",
+  [XC_draped_box] = "draped_box",
+  [XC_exchange] = "exchange",
+  [XC_fleur] = "fleur",
+  [XC_gobbler] = "gobbler",
+  [XC_gumby] = "gumby",
+  [XC_hand1] = "hand1",
+  [XC_hand2] = "hand2",
+  [XC_heart] = "heart",
+  [XC_icon] = "icon",
+  [XC_iron_cross] = "iron_cross",
+  [XC_left_ptr] = "left_ptr",
+  [XC_left_side] = "left_side",
+  [XC_left_tee] = "left_tee",
+  [XC_leftbutton] = "leftbutton",
+  [XC_ll_angle] = "ll_angle",
+  [XC_lr_angle] = "lr_angle",
+  [XC_man] = "man",
+  [XC_middlebutton] = "middlebutton",
+  [XC_mouse] = "mouse",
+  [XC_pencil] = "pencil",
+  [XC_pirate] = "pirate",
+  [XC_plus] = "plus",
+  [XC_question_arrow] = "question_arrow",
+  [XC_right_ptr] = "right_ptr",
+  [XC_right_side] = "right_side",
+  [XC_right_tee] = "right_tee",
+  [XC_rightbutton] = "rightbutton",
+  [XC_rtl_logo] = "rtl_logo",
+  [XC_sailboat] = "sailboat",
+  [XC_sb_down_arrow] = "sb_down_arrow",
+  [XC_sb_h_double_arrow] = "sb_h_double_arrow",
+  [XC_sb_left_arrow] = "sb_left_arrow",
+  [XC_sb_right_arrow] = "sb_right_arrow",
+  [XC_sb_up_arrow] = "sb_up_arrow",
+  [XC_sb_v_double_arrow] = "sb_v_double_arrow",
+  [XC_shuttle] = "shuttle",
+  [XC_sizing] = "sizing",
+  [XC_spider] = "spider",
+  [XC_spraycan] = "spraycan",
+  [XC_star] = "star",
+  [XC_target] = "target",
+  [XC_tcross] = "tcross",
+  [XC_top_left_arrow] = "top_left_arrow",
+  [XC_top_left_corner] = "top_left_corner",
+  [XC_top_right_corner] = "top_right_corner",
+  [XC_top_side] = "top_side",
+  [XC_top_tee] = "top_tee",
+  [XC_trek] = "trek",
+  [XC_ul_angle] = "ul_angle",
+  [XC_umbrella] = "umbrella",
+  [XC_ur_angle] = "ur_angle",
+  [XC_watch] = "watch",
+  [XC_xterm] = "xterm",
+};
+
+static xcb_cursor_context_t *get_xcb_cursor_context(void) {
+  static xcb_cursor_context_t *ctx = NULL;
+  if (ctx) return ctx;
+
+  if (xcb_cursor_context_new(conn, screen, &ctx) < 0) {
+    return NULL;
+  }
+
+  return ctx;
+}
+
+static const char *xcursor_font_tostr(uint16_t c) {
+  if (c < LENGTH(xcursor_font)) {
+    return xcursor_font[c];
+  }
+  return NULL;
+}
+
+xcb_cursor_t get_xcb_cursor(cursor_t cursor) {
+  xcb_cursor_context_t *ctx = get_xcb_cursor_context();
+  if (!ctx) die("cannot get cursor:");
+
+  static xcb_cursor_t cursor_list[LENGTH(xcursor_font)];
+  if (!cursor_list[cursor]) {
+    const char *name = xcursor_font_tostr(cursor);
+    cursor_list[cursor] = xcb_cursor_load_cursor(ctx, name);
+  }
+  return cursor_list[cursor];
+}

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);
+}

src/xcb/xcb-private.h

@@ -1,6 +1,8 @@
 #pragma once
 
-#include <xcb/xcb.h>
+#include "xcb.h"
 
 extern xcb_connection_t *conn;
 extern xcb_screen_t *screen;
+
+xcb_cursor_t get_xcb_cursor(cursor_t cursor);