Calculate window size and position

1 files changed, 63 insertions, 18 deletions

diff --git a/x11.c b/x11.c
index 9d4ff53..831b216 100644
--- a/x11.c
+++ b/x11.c
@@ -10,6 +10,7 @@
 #include <xcb/xcb_icccm.h>
 #include <xcb/xcb_xrm.h>
 #include <xcb/randr.h>
+#include <xcb/xcb_atom.h>
 
 #include "x11.h"
 #include "log.h"
@@ -25,6 +26,13 @@ struct Window {
     double dpi;
 };
 
+static xcb_atom_t intern_atom(Window *win, const char *atom)
+{
+    // TODO: Error handling
+    xcb_intern_atom_cookie_t cookie = xcb_intern_atom(win->connection, false, strlen(atom), atom);
+    return xcb_intern_atom_reply(win->connection, cookie, NULL)->atom;
+}
+
 Window *window_create(void)
 {
     Window *win = g_malloc0(sizeof(Window));
@@ -34,6 +42,16 @@ Window *window_create(void)
     assert(win->connection != NULL && !xcb_connection_has_error(win->connection));
     log_debug("Xcb established connection");
 
+    xcb_screen_iterator_t iter = xcb_setup_roots_iterator(xcb_get_setup(win->connection));
+    log_debug("Default screen %d", preferred_screen);
+
+    while (preferred_screen != 0 && iter.rem) {
+        xcb_screen_next(&iter);
+        preferred_screen--;
+    }
+
+    win->screen = iter.data;
+
     xcb_randr_query_version_cookie_t version_cookie = xcb_randr_query_version(win->connection,
                                                                               XCB_RANDR_MAJOR_VERSION,
                                                                               XCB_RANDR_MINOR_VERSION);
@@ -46,6 +64,13 @@ Window *window_create(void)
     log_debug("RandR version %d.%d", randr_version->major_version, randr_version->minor_version);
     assert(error == NULL || randr_version->major_version < 1);
 
+    xcb_randr_get_screen_info_cookie_t cookie = xcb_randr_get_screen_info(win->connection, win->screen->root);
+    xcb_randr_get_screen_info_reply_t *info_reply = xcb_randr_get_screen_info_reply(win->connection, cookie, &error);
+    assert(error == NULL);
+
+    xcb_randr_screen_size_t *screen_size = xcb_randr_get_screen_info_sizes(info_reply);
+    log_debug("Screen size [width=%d, height=%d]", screen_size->width, screen_size->height);
+
     xcb_randr_select_input(win->connection,
                            win->window,
                            XCB_RANDR_NOTIFY_MASK_SCREEN_CHANGE |
@@ -58,25 +83,14 @@ Window *window_create(void)
     char *dpi_value;
     if (xcb_xrm_resource_get_string(win->database, "Xft.dpi", "Xft.dpi", &dpi_value) >= 0) {
         log_debug("Xrm query '%s' found '%s'", "Xft.dpi", dpi_value);
-
         win->dpi = strtod(dpi_value, NULL);
         g_free(dpi_value);
     } else {
         log_debug("Xrm query '%s' not found", "Xft.dpi");
-
-        // TODO: Calculate automatically somehow
         win->dpi = 96.0;
+        //win->dpi = (double)screen_size->height * 25.4 / (double)screen_size->mheight;
+        log_debug("Fallback dpi value '%lf'", win->dpi);
     }
-
-    xcb_screen_iterator_t iter = xcb_setup_roots_iterator(xcb_get_setup(win->connection));
-    log_debug("Default screen %d", preferred_screen);
-
-    while (preferred_screen != 0 && iter.rem) {
-        xcb_screen_next(&iter);
-        preferred_screen--;
-    }
-
-    win->screen = iter.data;
     xcb_depth_iterator_t depth_iter = xcb_screen_allowed_depths_iterator(win->screen);
 
     while (depth_iter.rem) {
@@ -106,7 +120,7 @@ found_visual:
     xcb_colormap_t colormap = xcb_generate_id(win->connection);
 	xcb_create_colormap(win->connection, XCB_COLORMAP_ALLOC_NONE, colormap, win->screen->root, win->visual_type->visual_id);
 
-    log_debug("X11 colormap created (id %u)", colormap);
+    log_debug("Xcb colormap created (id %u)", colormap);
 
     const uint32_t value_list[] = {
         XCB_NONE,   // back pixmap
@@ -117,24 +131,55 @@ found_visual:
         colormap    // colormap
     };
 
-    int y = 10, x = 10, width = 1000, height = 100;
+    int width = screen_size->width * 0.98;
+    int height = screen_size->height * 0.03;
+
+    width -= width % 2 != 0;
+    height -= height % 2 != 0;
+
+    log_debug("Window size [width=%d, height=%d]", width, height);
+
+    int x = (screen_size->width - width) / 2.0;
+    int y = screen_size->height * 0.0125;
+
+    log_debug("Window position [x=%d, y=%d]", x, y);
 
     win->window = xcb_generate_id(win->connection);
     xcb_create_window(win->connection,
                       XCB_COPY_FROM_PARENT,
                       win->window, win->screen->root,
-                      y, x, width, height, 0,
+                      x, y, width, height, 0,
                       XCB_WINDOW_CLASS_INPUT_OUTPUT,
                       win->screen->root_visual,
                       value_mask,
                       value_list);
 
-    log_debug("X11 window created (id %u)", win->window);
+    log_debug("Xcb window created (id %u)", win->window);
 
     xcb_icccm_set_wm_name(win->connection, win->window, XCB_ATOM_STRING, 8, strlen("comet"), "comet");
     xcb_map_window(win->connection, win->window);
-    xcb_flush(win->connection);
 
+    xcb_atom_t NET_WM_WINDOW_OPACITY = intern_atom(win, "_NET_WM_WINDOW_OPACITY");
+    xcb_atom_t CARDINAL = intern_atom(win, "CARDINAL");
+
+    // Value between 0 and 1
+    double transparency = 0.8;
+    unsigned long opacity = 0xffffffff * transparency;
+
+    //error =
+    //xcb_request_check(win->connection,
+    //xcb_change_property_checked(win->connection,
+    //                    XCB_PROP_MODE_REPLACE,
+    //                    win->window,
+    //                    NET_WM_WINDOW_OPACITY,
+    //                    CARDINAL,
+    //                    32,
+    //                    1,
+    //                    (char *)&opacity));
+    //assert(error == NULL);
+    //log_debug("Window '%s' set to '%d%%'", "opacity", (int)round(100 - 100 * transparency));
+
+    xcb_flush(win->connection);
     log_debug("Xcb initialized");
 
     win->surface = cairo_xcb_surface_create(win->connection, win->window, win->visual_type, width, height);