From 2497c1392b81e093f4de2541a98746aebd449a7f Mon Sep 17 00:00:00 2001
From: Peter Wu <lekensteyn@gmail.com>
Date: Wed, 26 Sep 2012 15:04:18 +0200
Subject: Initial commit

---
 xcbviewfs.c | 139 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 139 insertions(+)
 create mode 100644 xcbviewfs.c

(limited to 'xcbviewfs.c')

diff --git a/xcbviewfs.c b/xcbviewfs.c
new file mode 100644
index 0000000..79386dd
--- /dev/null
+++ b/xcbviewfs.c
@@ -0,0 +1,139 @@
+/*
+ * Attempt to implement picture viewer XCB with kbd and pointer grabbing, fullscreen
+ *
+ * Author: Peter Wu <lekensteyn@gmail.com>
+ * Date: 2012-09-24
+ * gcc -o xcbviewfs xcbviewfs.c -lxcb-image -lxcb-shm -lxcb
+ */
+
+#include <xcb/xcb.h>
+//#include <X11/Xlib.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+
+#define die(msg) do { \
+	fprintf(stderr, msg); \
+	exit(EXIT_FAILURE); \
+} while (0)
+
+#define bail(lbl, msg) do { \
+	fprintf(stderr, msg); \
+	goto lbl; \
+} while (0)
+
+static const char empty_cursor_data[32];
+
+int main(int argc, char **argv) {
+	xcb_connection_t *c;
+	xcb_screen_t *screen;
+	xcb_window_t win;
+	xcb_cursor_t cursor;
+	if (argc < 2) {
+		fprintf(stderr, "Usage: %s filename\n", *argv);
+		return 1;
+	}
+	c = xcb_connect(NULL, NULL);
+	if (!c) {
+		fprintf(stderr, "Cannot open display\n");
+		return 1;
+	}
+	screen = xcb_setup_roots_iterator(xcb_get_setup(c)).data;
+	win = xcb_generate_id(c);
+	xcb_create_window(c, 0, win, /* conn, depth, WinID */
+		screen->root, /* parent */
+		0, 0, /* x y */
+		100, 100, /* width height */
+		0, /* border_width */
+		XCB_WINDOW_CLASS_INPUT_OUTPUT, /* class */
+		screen->root_visual,
+		0, NULL);
+	xcb_map_window(c, win);
+	xcb_flush(c);
+
+	/* options */
+	int grab_pointer = 0;
+	int hide_cursor  = 0;
+	int grab_kbd     = 0;
+	int fullscreen   = 0;
+	grab_kbd = !(fullscreen = grab_pointer = hide_cursor = 0 );
+
+	if (grab_pointer) {
+		xcb_grab_pointer_cookie_t cookie;
+		xcb_grab_pointer_reply_t *reply;
+		cookie = xcb_grab_pointer(c, 1, screen->root, XCB_NONE,
+			XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC,
+			XCB_NONE, XCB_NONE,
+			XCB_CURRENT_TIME);
+		if (!(reply = xcb_grab_pointer_reply(c, cookie, NULL))) {
+			bail(disconnect, "No pointer grab reply\n");
+		}
+		if (reply->status != XCB_GRAB_STATUS_SUCCESS) {
+			bail(disconnect, "Grab pointer FAILED\n");
+		}
+		free(reply);
+	}
+	if (hide_cursor) {
+		xcb_pixmap_t cp = xcb_create_pixmap_from_bitmap_data(c, win,
+			empty_cursor_data, 16, 16, 1, 0, 0, 0);
+		xcb_pixmap_t mp = xcb_create_pixmap_from_bitmap_data(c, win,
+			empty_cursor_data, 16, 16, 1, 0, 0, 0);
+
+		cursor = xcb_generate_id(c);
+		xcb_create_cursor(c, cursor, cp, mp, 0, 0, 0, 0xFFFF, 0xFFFF, 0xFFFF, 8, 8);
+		xcb_free_pixmap(c, cp);
+		xcb_free_pixmap(c, mp);
+
+		xcb_change_window_attributes(c, win, XCB_CW_CURSOR, &cursor);
+		xcb_free_cursor(c, cursor);
+		xcb_flush(c);
+	}
+	if (grab_kbd) {
+		xcb_grab_keyboard_cookie_t cookie;
+		xcb_grab_keyboard_reply_t *reply;
+		cookie = xcb_grab_keyboard(c, 1, screen->root, XCB_CURRENT_TIME,
+			XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC);
+		if (!(reply = xcb_grab_keyboard_reply(c, cookie, NULL))) {
+			bail(ungrab_pointer, "No kbd grab reply\n");
+		}
+		if (reply->status != XCB_GRAB_STATUS_SUCCESS) {
+			bail(ungrab_pointer, "Grab kbd FAILED\n");
+		}
+		free(reply);
+	}
+	if (fullscreen) {
+		xcb_intern_atom_cookie_t cookie;
+		xcb_intern_atom_reply_t *reply;
+		xcb_atom_t property, data;
+
+		cookie = xcb_intern_atom(c, 0, 13, "_NET_WM_STATE");
+		if (!(reply = xcb_intern_atom_reply(c, cookie, 0))) {
+			bail(ungrab_kbd, "Failed to get _NET_WM_STATE atom\n");
+		}
+		property = reply->atom;
+		free(reply);
+
+		cookie = xcb_intern_atom(c, 0, 24, "_NET_WM_STATE_FULLSCREEN");
+		if (!(reply = xcb_intern_atom_reply(c, cookie, 0))) {
+			bail(ungrab_kbd, "Failed to get _NET_WM_STATE_FULLSCREEN atom\n");
+		}
+		data = reply->atom;
+		free(reply);
+
+		xcb_change_property(c, XCB_PROP_MODE_REPLACE, win,
+			property, XCB_ATOM_ATOM, 32, 1, &data);
+		xcb_flush(c);
+	}
+	xcb_generic_event_t *e;
+	while ((e = xcb_wait_for_event(c))) {
+		free(e);
+	}
+ungrab_kbd:
+	xcb_ungrab_keyboard(c, XCB_CURRENT_TIME);
+ungrab_pointer:
+	xcb_ungrab_pointer(c, XCB_CURRENT_TIME);
+disconnect:
+	xcb_disconnect(c);
+	return 0;
+}
-- 
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