Hello,
I modified my previous patch that adds the necessary functions for controlling
the backlight levels. I fixed an small inconsistency in the function returning
the backlight level. Since my previous patch is not already applied, could one
you consider this modified version instead.
I should point out that these two functions are already defined in the API of
Ecore 1.0.0 but there are not implemented. So it might be a good idea to add
the functions in Ecore 1.0.0 since there is not API break.
For the ChangeLog
09-02-2011 Mathieu Taillefumier
Add the functions for controlling the backlight level in Ecore. They
are implemented using the xrandr extension.
Mathieu
Index: src/lib/ecore_x/xlib/ecore_x_randr_12.c
===================================================================
--- src/lib/ecore_x/xlib/ecore_x_randr_12.c (revision 56841)
+++ src/lib/ecore_x/xlib/ecore_x_randr_12.c (working copy)
@@ -36,6 +36,7 @@
Window
window);
extern int _randr_version;
+static Ecore_X_Atom _backlight;
#endif
/**
@@ -82,7 +83,7 @@
int i;
Eina_Bool ret = EINA_FALSE;
- if ((crtc == Ecore_X_Randr_None) ||
+ if ((crtc == Ecore_X_Randr_None) ||
(crtc == Ecore_X_Randr_Unset))
return ret;
@@ -837,7 +838,7 @@
}
if (crtc_info)
XRRFreeCrtcInfo(crtc_info);
-
+
if (res)
XRRFreeScreenResources(res);
@@ -867,10 +868,10 @@
}
if (crtc_info)
XRRFreeCrtcInfo(crtc_info);
-
+
if (res)
XRRFreeScreenResources(res);
-
+
return ret;
#else
return Ecore_X_Randr_None;
@@ -1904,3 +1905,162 @@
Ecore_X_Randr_Unset);
#endif
}
+
+/**
+ * @brief set up the backlight level to the given level.
+ * @param root the window's screen which will be set.
+ * @param level of the backlight between 0 and 100
+ */
+
+EAPI void
+ecore_x_randr_screen_backlight_level_set(Ecore_X_Window root, double level)
+{
+#ifdef ECORE_XRANDR
+ RANDR_CHECK_1_2_RET();
+ /*
+ * maybe move this should be in the init part the module.
+ * Initialize it if not already initialized
+ */
+
+ if((level < 0)||(level > 100))
+ {
+ ERR("Wrong value for the backlight level. It should be between 0 and 100.");
+ return;
+ }
+
+ if(_backlight == None)
+ _backlight = XInternAtom (_ecore_x_disp, RANDR_PROPERTY_BACKLIGHT, True);
+
+ /* Clearly the server does not support it. */
+ if(_backlight == None)
+ {
+ ERR("Backlight property is not suppported on this server or driver");
+ return;
+ }
+
+ /* get the ressources */
+ XRRScreenResources *resources = _ecore_x_randr_get_screen_resources (_ecore_x_disp, root);
+
+ if (!resources) return;
+ int o;
+ for (o = 0; o < resources->noutput; o++)
+ {
+ Ecore_X_Randr_Output output = resources->outputs[o];
+ if (ecore_x_randr_output_backlight_level_get(root, output) >= 0)
+ {
+ ecore_x_randr_output_backlight_level_set(root, output, level);
+ }
+ }
+ XRRFreeScreenResources (resources);
+#endif
+}
+
+/*
+ * @brief get the backlight level of the given output
+ * @param root window which's screen should be queried
+ * @param output from which the backlight level should be retrieved
+ * @return the backlight level
+ */
+
+EAPI double
+ecore_x_randr_output_backlight_level_get(Ecore_X_Window root,
+ Ecore_X_Randr_Output output)
+{
+#ifdef ECORE_XRANDR
+ RANDR_CHECK_1_2_RET(-1);
+ unsigned long nitems;
+ unsigned long bytes_after;
+ unsigned char *prop;
+ Atom actual_type;
+ int actual_format;
+ long value;
+
+ /* set backlight variable if not already done */
+ if(_backlight == None)
+ _backlight = XInternAtom (_ecore_x_disp, RANDR_PROPERTY_BACKLIGHT, True);
+ if(_backlight == None)
+ {
+ ERR("Backlight property is not suppported on this server or driver");
+ return -1;
+ }
+
+ if(!_ecore_x_randr_output_validate(root, output)) {
+ ERR("Invalid output\n");
+ return -1;
+ }
+
+ if (XRRGetOutputProperty (_ecore_x_disp, output, _backlight,
+ 0, 4, False, False, None,
+ &actual_type, &actual_format,
+ &nitems, &bytes_after, &prop) != Success) {
+ WRN("Backlight not supported on this output");
+ return -1;
+ }
+
+ if (actual_type != XA_INTEGER || nitems != 1 || actual_format != 32)
+ value = -1;
+ else
+ value = *((long *) prop);
+ free (prop);
+
+ /* I have the current value of the backlight */
+ /* Now retrieve the min and max intensities of the output */
+ XRRPropertyInfo *info = XRRQueryOutputProperty (_ecore_x_disp, output, _backlight);
+ if (info)
+ {
+ if (info->range && info->num_values == 2)
+ {
+ /* finally convert the current value in percent to be user friendly */
+ long min = info->values[0];
+ long max = info->values[1];
+ value = (value-min)*100/(max-min);
+ }
+ free(info);
+ }
+ return ((double)value);
+#else
+ return -1;
+#endif
+}
+
+/*
+ * @brief set the backlight level of a given output
+ * @param root window which's screen should be queried
+ * @param output that should be set
+ * @param level for which the backlight should be set
+ * @return EINA_TRUE in case of success
+ */
+
+EAPI Eina_Bool
+ecore_x_randr_output_backlight_level_set(Ecore_X_Window root,
+ Ecore_X_Randr_Output output,
+ double level)
+{
+#ifdef ECORE_XRANDR
+ RANDR_CHECK_1_2_RET(EINA_FALSE);
+ if(!_ecore_x_randr_output_validate(root, output))
+ return EINA_FALSE;
+
+ XRRPropertyInfo *info = XRRQueryOutputProperty (_ecore_x_disp, output, _backlight);
+ if (info)
+ {
+ if (info->range && info->num_values == 2)
+ {
+ double min = info->values[0];
+ double max = info->values[1];
+ double tmp = (level * (max - min) / 100) + min;
+ long new = tmp;
+ if (new > max) new = max;
+ if (new < min) new = min;
+ XRRChangeOutputProperty (_ecore_x_disp, output, _backlight, XA_INTEGER, 32,
+ PropModeReplace, (unsigned char *) &new, 1);
+ XFlush (_ecore_x_disp);
+ }
+ free(info);
+ return EINA_TRUE;
+ }
+ return EINA_FALSE;
+#else
+ return EINA_FALSE;
+#endif
+}
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