[PATCH] Port of xbacklight to XCB
Jon Lund Steffensen
jonlst at gmail.com
Sun Jan 29 06:02:30 PST 2012
I've ported xbacklight to XCB; patch below. I'm posting it here in
case anyone is interested.
Cheers,
Jon
---
configure.ac | 2 +-
xbacklight.c | 272 +++++++++++++++++++++++++++++++++++-----------------------
2 files changed, 165 insertions(+), 109 deletions(-)
diff --git a/configure.ac b/configure.ac
index 2c67604..87c7b26 100644
--- a/configure.ac
+++ b/configure.ac
@@ -37,7 +37,7 @@ XORG_DEFAULT_OPTIONS
AC_CONFIG_HEADERS([config.h])
# Checks for pkg-config packages
-PKG_CHECK_MODULES(XRANDR, xrandr >= 1.2.0 x11)
+PKG_CHECK_MODULES(XRANDR, [xcb-randr >= 1.2 xcb-atom xcb-aux xcb])
AC_CONFIG_FILES([
Makefile
diff --git a/xbacklight.c b/xbacklight.c
index 9b68ce8..942fa3f 100644
--- a/xbacklight.c
+++ b/xbacklight.c
@@ -21,9 +21,11 @@
*/
#include <stdio.h>
#include <stdlib.h>
-#include <X11/Xatom.h>
-#include <X11/Xlib.h>
-#include <X11/extensions/Xrandr.h>
+
+#include <xcb/xcb.h>
+#include <xcb/xcb_util.h>
+#include <xcb/xproto.h>
+#include <xcb/randr.h>
#include <ctype.h>
#include <string.h>
@@ -33,7 +35,7 @@ typedef enum { Get, Set, Inc, Dec } op_t;
static char *program_name;
-static Atom backlight, backlight_new, backlight_legacy;
+static xcb_atom_t backlight, backlight_new, backlight_legacy;
static void
usage (void)
@@ -53,58 +55,75 @@ usage (void)
}
static long
-backlight_get (Display *dpy, RROutput output)
+backlight_get (xcb_connection_t *conn, xcb_randr_output_t output)
{
- unsigned long nitems;
- unsigned long bytes_after;
- unsigned char *prop;
- Atom actual_type;
- int actual_format;
- long value;
-
+ xcb_generic_error_t *error;
+ xcb_randr_get_output_property_reply_t *prop_reply = NULL;
+ xcb_randr_get_output_property_cookie_t prop_cookie;
+ long value;
+
backlight = backlight_new;
- if (!backlight ||
- XRRGetOutputProperty (dpy, output, backlight,
- 0, 4, False, False, None,
- &actual_type, &actual_format,
- &nitems, &bytes_after, &prop) != Success) {
- backlight = backlight_legacy;
- if (!backlight ||
- XRRGetOutputProperty (dpy, output, backlight,
- 0, 4, False, False, None,
- &actual_type, &actual_format,
- &nitems, &bytes_after, &prop) != Success)
- return -1;
+ if (backlight != XCB_ATOM_NONE) {
+ prop_cookie = xcb_randr_get_output_property (conn, output,
+ backlight, XCB_ATOM_NONE,
+ 0, 4, 0, 0);
+ prop_reply = xcb_randr_get_output_property_reply (conn,
prop_cookie, &error);
+ if (error != NULL || prop_reply == NULL) {
+ backlight = backlight_legacy;
+ if (backlight != XCB_ATOM_NONE) {
+ prop_cookie = xcb_randr_get_output_property (conn, output,
+
backlight, XCB_ATOM_NONE,
+ 0, 4, 0, 0);
+ prop_reply = xcb_randr_get_output_property_reply
(conn, prop_cookie, &error);
+ if (error != NULL || prop_reply == NULL) {
+ return -1;
+ }
+ }
+ }
}
- if (actual_type != XA_INTEGER || nitems != 1 || actual_format != 32)
+ if (prop_reply == NULL ||
+ prop_reply->type != XCB_ATOM_INTEGER ||
+ prop_reply->num_items != 1 ||
+ prop_reply->format != 32) {
value = -1;
- else
- value = *((long *) prop);
- XFree (prop);
+ } else {
+ value = *((long *) xcb_randr_get_output_property_data (prop_reply));
+ }
+
+ free (prop_reply);
return value;
}
static void
-backlight_set (Display *dpy, RROutput output, long value)
+backlight_set (xcb_connection_t *conn, xcb_randr_output_t output, long value)
{
- XRRChangeOutputProperty (dpy, output, backlight, XA_INTEGER, 32,
- PropModeReplace, (unsigned char *) &value, 1);
+ xcb_randr_change_output_property (conn, output, backlight,
XCB_ATOM_INTEGER,
+ 32, XCB_PROP_MODE_REPLACE,
+ 1, (unsigned char *)&value);
}
int
main (int argc, char **argv)
{
char *dpy_name = NULL;
- Display *dpy;
- int screen;
- int major, minor;
op_t op = Get;
int value = 0;
int i;
int total_time = 200; /* ms */
int steps = 20;
+ xcb_connection_t *conn;
+ xcb_generic_error_t *error;
+
+ xcb_randr_query_version_cookie_t ver_cookie;
+ xcb_randr_query_version_reply_t *ver_reply;
+
+ xcb_intern_atom_cookie_t backlight_cookie[2];
+ xcb_intern_atom_reply_t *backlight_reply;
+
+ xcb_screen_iterator_t iter;
+
program_name = argv[0];
for (i = 1; i < argc; i++)
@@ -177,97 +196,134 @@ main (int argc, char **argv)
}
usage ();
}
- dpy = XOpenDisplay (dpy_name);
- if (!dpy)
- {
- fprintf (stderr, "Cannot open display \"%s\"\n",
- XDisplayName (dpy_name));
- exit (1);
+ conn = xcb_connect (dpy_name, NULL);
+ ver_cookie = xcb_randr_query_version (conn, 1, 2);
+ ver_reply = xcb_randr_query_version_reply (conn, ver_cookie, &error);
+ if (error != NULL || ver_reply == NULL) {
+ int ec = error ? error->error_code : -1;
+ fprintf (stderr, "RANDR Query Version returned error %d\n", ec);
+ exit (1);
}
- if (!XRRQueryVersion (dpy, &major, &minor))
- {
- fprintf (stderr, "RandR extension missing\n");
- exit (1);
+ if (ver_reply->major_version != 1 ||
+ ver_reply->minor_version < 2) {
+ fprintf (stderr, "RandR version %d.%d too old\n",
+ ver_reply->major_version, ver_reply->minor_version);
+ exit (1);
}
- if (major < 1 || (major == 1 && minor < 2))
- {
- fprintf (stderr, "RandR version %d.%d too old\n", major, minor);
- exit (1);
+ free (ver_reply);
+
+ backlight_cookie[0] = xcb_intern_atom (conn, 1,
strlen("Backlight"), "Backlight");
+ backlight_cookie[1] = xcb_intern_atom (conn, 1,
strlen("BACKLIGHT"), "BACKLIGHT");
+
+ backlight_reply = xcb_intern_atom_reply (conn,
backlight_cookie[0], &error);
+ if (error != NULL || backlight_reply == NULL) {
+ int ec = error ? error->error_code : -1;
+ fprintf (stderr, "Intern Atom returned error %d\n", ec);
+ exit (1);
}
- backlight_new = XInternAtom (dpy, "Backlight", True);
- backlight_legacy = XInternAtom (dpy, "BACKLIGHT", True);
- if (backlight_new == None && backlight_legacy == None)
- {
+ backlight_new = backlight_reply->atom;
+ free (backlight_reply);
+
+ backlight_reply = xcb_intern_atom_reply (conn,
backlight_cookie[1], &error);
+ if (error != NULL || backlight_reply == NULL) {
+ int ec = error ? error->error_code : -1;
+ fprintf (stderr, "Intern Atom returned error %d\n", ec);
+ exit (1);
+ }
+
+ backlight_legacy = backlight_reply->atom;
+ free (backlight_reply);
+
+ if (backlight_new == XCB_NONE && backlight_legacy == XCB_NONE) {
fprintf (stderr, "No outputs have backlight property\n");
exit (1);
}
- for (screen = 0; screen < ScreenCount (dpy); screen++)
- {
- Window root = RootWindow (dpy, screen);
- XRRScreenResources *resources = XRRGetScreenResources (dpy, root);
- int o;
-
- if (!resources) continue;
- for (o = 0; o < resources->noutput; o++)
+
+ iter = xcb_setup_roots_iterator (xcb_get_setup (conn));
+ while (iter.rem) {
+ xcb_screen_t *screen = iter.data;
+ xcb_window_t root = screen->root;
+ xcb_randr_output_t *outputs;
+
+ xcb_randr_get_screen_resources_cookie_t resources_cookie;
+ xcb_randr_get_screen_resources_reply_t *resources_reply;
+
+ resources_cookie = xcb_randr_get_screen_resources (conn, root);
+ resources_reply = xcb_randr_get_screen_resources_reply (conn,
resources_cookie, &error);
+ if (error != NULL || resources_reply == NULL) {
+ int ec = error ? error->error_code : -1;
+ fprintf (stderr, "RANDR Get Screen Resources returned
error %d\n", ec);
+ continue;
+ }
+
+ outputs = xcb_randr_get_screen_resources_outputs (resources_reply);
+ for (int o = 0; o < resources_reply->num_outputs; o++)
{
- RROutput output = resources->outputs[o];
- XRRPropertyInfo *info;
+ xcb_randr_output_t output = outputs[o];
double cur, new, step;
double min, max;
double set;
- cur = backlight_get (dpy, output);
+ cur = backlight_get (conn, output);
if (cur != -1)
{
- info = XRRQueryOutputProperty (dpy, output, backlight);
- if (info)
- {
- if (info->range && info->num_values == 2)
- {
- min = info->values[0];
- max = info->values[1];
- if (op == Get) {
- printf ("%f\n", (cur - min) * 100 / (max - min));
- } else {
- set = value * (max - min) / 100;
- switch (op) {
- case Set:
- new = min + set;
- break;
- case Inc:
- new = cur + set;
- break;
- case Dec:
- new = cur - set;
- break;
- default:
- XSync (dpy, False);
- return 1;
- }
- if (new > max) new = max;
- if (new < min) new = min;
- step = (new - cur) / steps;
- for (i = 0; i < steps && step != 0; i++)
- {
- if (i == steps - 1)
- cur = new;
- else
- cur += step;
- backlight_set (dpy, output, (long) cur);
- XFlush (dpy);
- usleep (total_time * 1000 / steps);
- }
- }
- }
- XFree (info);
- }
+ xcb_randr_query_output_property_cookie_t prop_cookie;
+ xcb_randr_query_output_property_reply_t *prop_reply;
+
+ prop_cookie = xcb_randr_query_output_property (conn,
output, backlight);
+ prop_reply = xcb_randr_query_output_property_reply
(conn, prop_cookie, &error);
+
+ if (error != NULL || prop_reply == NULL) continue;
+
+ if (prop_reply->range &&
+
xcb_randr_query_output_property_valid_values_length (prop_reply) == 2)
{
+ int32_t *values =
xcb_randr_query_output_property_valid_values (prop_reply);
+ min = values[0];
+ max = values[1];
+
+ if (op == Get) {
+ printf ("%f\n", (cur - min) * 100 / (max - min));
+ } else {
+ set = value * (max - min) / 100;
+ switch (op) {
+ case Set:
+ new = min + set;
+ break;
+ case Inc:
+ new = cur + set;
+ break;
+ case Dec:
+ new = cur - set;
+ break;
+ default:
+ xcb_aux_sync (conn);
+ return 1;
+ }
+ if (new > max) new = max;
+ if (new < min) new = min;
+ step = (new - cur) / steps;
+ for (i = 0; i < steps && step != 0; i++)
+ {
+ if (i == steps - 1)
+ cur = new;
+ else
+ cur += step;
+ backlight_set (conn, output, (long) cur);
+ xcb_flush (conn);
+ usleep (total_time * 1000 / steps);
+ }
+ }
+ }
+ free (prop_reply);
}
}
-
- XRRFreeScreenResources (resources);
+
+ free (resources_reply);
+ xcb_screen_next (&iter);
}
- XSync (dpy, False);
+
+ xcb_aux_sync (conn);
return 0;
}
--
1.7.5.4
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