zswm/src/xcb/window.c

#include "window.h"

#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <xcb/xcb.h>
#include <xcb/xcb_aux.h>
#include <xcb/xcb_ewmh.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) {
  size_t class_length = strlen(class) + 1;
  size_t instance_length = strlen(instance) + 1;
  size_t length = class_length + instance_length;

  char *str = malloc(length * sizeof(char));
  for (size_t i = 0; i < length; i++) {
    if (i < class_length) {
      str[i] = class[i];
    } else {
      str[i] = instance[i - class_length];
    }
  }

  xcb_icccm_set_wm_class(conn, window, length, str);
  free(str);
}

static char broken[] = "broken";

void get_window_class_instance(xcb_window_t window,
                               window_class_instance_t *class_instance) {
  xcb_get_property_cookie_t cookie = xcb_icccm_get_wm_class(conn, window);
  xcb_icccm_get_wm_class_reply_t prop;
  const char *class = NULL;
  const char *instance = NULL;
  if (xcb_icccm_get_wm_class_reply(conn, cookie, &prop, NULL)) {
    class = prop.class_name;
    instance = prop.instance_name;
  } else {
    class = broken;
    instance = broken;
  }

  strncpy(class_instance->class, class, LENGTH(class_instance->class));
  strncpy(class_instance->instance, instance, LENGTH(class_instance->instance));

  xcb_icccm_get_wm_class_reply_wipe(&prop);
}

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 configure_window(xcb_window_t window, int32_t x, int32_t y, uint32_t width,
                      uint32_t height, uint32_t border_width) {
  xcb_config_window_t config_mask =
    XCB_CONFIG_WINDOW_X | XCB_CONFIG_WINDOW_Y | XCB_CONFIG_WINDOW_WIDTH |
    XCB_CONFIG_WINDOW_HEIGHT | XCB_CONFIG_WINDOW_BORDER_WIDTH;
  xcb_params_configure_window_t window_config = {
    .x = x,
    .y = y,
    .width = width,
    .height = height,
    .border_width = border_width,
  };
  xcb_aux_configure_window(conn, window, config_mask, &window_config);
}

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);
}

xcb_window_t get_root_window(void) { return screen->root; }

bool get_window_visible(xcb_window_t window) {
  xcb_get_window_attributes_cookie_t cookie =
    xcb_get_window_attributes(conn, window);
  xcb_get_window_attributes_reply_t *reply =
    xcb_get_window_attributes_reply(conn, cookie, NULL);
  bool visible =
    !reply->override_redirect && reply->map_state != XCB_MAP_STATE_UNVIEWABLE;
  free(reply);

  return visible;
}

xcb_window_t get_transient_window_for(xcb_window_t window) {
  xcb_window_t transient_for = WINDOW_NONE;
  xcb_get_property_cookie_t cookie =
    xcb_icccm_get_wm_transient_for(conn, window);
  if (xcb_icccm_get_wm_transient_for_reply(conn, cookie, &transient_for,
                                           NULL)) {
    return transient_for;
  }
  return WINDOW_NONE;
}

window_geometry_t *get_window_geometry(xcb_window_t window) {
  xcb_get_geometry_cookie_t cookie = xcb_get_geometry(conn, window);
  xcb_get_geometry_reply_t *reply = xcb_get_geometry_reply(conn, cookie, NULL);

  window_geometry_t *geometry = ecalloc(1, sizeof(window_geometry_t));
  geometry->x = reply->x;
  geometry->y = reply->y;
  geometry->width = reply->width;
  geometry->height = reply->height;
  geometry->border_width = reply->border_width;

  free(reply);
  return geometry;
}

void map_window(xcb_window_t window) {
  xcb_map_window(conn, window);
  xcb_map_subwindows(conn, window);
}

char *get_window_name(xcb_window_t window) {
  xcb_get_property_cookie_t cookie = xcb_ewmh_get_wm_name(ewmh, window);
  xcb_ewmh_get_utf8_strings_reply_t reply;
  if (xcb_ewmh_get_wm_name_reply(ewmh, cookie, &reply, NULL)) {
    char *name = ecalloc(reply.strings_len + 1, sizeof(char));
    strncpy(name, reply.strings, reply.strings_len);
    xcb_ewmh_get_utf8_strings_reply_wipe(&reply);
    return name;
  }

  cookie = xcb_icccm_get_wm_name(conn, window);
  xcb_icccm_get_text_property_reply_t prop;
  if (xcb_icccm_get_wm_name_reply(conn, cookie, &prop, NULL)) {
    char *name = ecalloc(prop.name_len + 1, sizeof(char));
    strncpy(name, prop.name, prop.name_len);
    xcb_icccm_get_text_property_reply_wipe(&prop);
    return name;
  }

  {
    char *name = ecalloc(LENGTH(broken), sizeof(char));
    strncpy(name, broken, LENGTH(broken));
    return name;
  }
}

void set_window_event_mask(xcb_window_t window, bool clear) {
  xcb_cw_t change_mask = XCB_CW_EVENT_MASK;
  uint32_t event_mask = clear ? XCB_EVENT_MASK_NO_EVENT
                              : XCB_EVENT_MASK_ENTER_WINDOW |
                                  XCB_EVENT_MASK_FOCUS_CHANGE |
                                  XCB_EVENT_MASK_PROPERTY_CHANGE |
                                  XCB_EVENT_MASK_SUBSTRUCTURE_NOTIFY;
  xcb_params_cw_t params = {.event_mask = event_mask};
  xcb_aux_change_window_attributes(conn, window, change_mask, &params);
}

void change_window_border_color(xcb_window_t window, uint32_t argb) {
  xcb_params_cw_t params = {.border_pixel = argb};
  xcb_aux_change_window_attributes(conn, window, XCB_CW_BORDER_PIXEL, &params);
}

void focus_window(xcb_window_t window) {
  xcb_window_t root = screen->root;
  if (window == WINDOW_NONE) {
    xcb_set_input_focus(conn, XCB_INPUT_FOCUS_POINTER_ROOT, root,
                        XCB_CURRENT_TIME);
    xcb_delete_property(conn, root, ewmh->_NET_ACTIVE_WINDOW);
  } else {
    xcb_set_input_focus(conn, XCB_INPUT_FOCUS_POINTER_ROOT, window,
                        XCB_CURRENT_TIME);
    xcb_change_property(conn, XCB_PROP_MODE_REPLACE, root,
                        ewmh->_NET_ACTIVE_WINDOW, XCB_ATOM_WINDOW, 32, 1,
                        &window);
    send_event(window, atom_wm_take_focus);
  }
}