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gdk: x11: Fill GdkMonitor manufacturer with PNP id from EDID

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Previously, the manufacturer property of the GdkMonitor was NULL,
and having at least PNP id at GdkMonitor.manufacturer makes it
possible to distinguish between different monitors programmatically.
This commit is contained in:
Priit Laes 2019-08-06 09:16:01 +03:00
parent a3609c3f6d
commit f43d344aa3
2 changed files with 53 additions and 1 deletions
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7
gdk/gdkmonitor.c
View File

@ -401,7 +401,12 @@ gdk_monitor_get_connector (GdkMonitor *monitor)
* gdk_monitor_get_manufacturer:
* @monitor: a #GdkMonitor
*
* Gets the name of the monitor's manufacturer, if available.
* Gets the name or PNP ID of the monitor's manufacturer, if available.
*
* Note that this value might also vary depending on actual
* display backend.
*
* PNP ID registry is located at https://uefi.org/pnp_id_list
*
* Returns: (transfer none) (nullable): the name of the manufacturer, or %NULL
*/

47
gdk/x11/gdkscreen-x11.c
View File

@ -354,6 +354,7 @@ init_randr15 (GdkX11Screen *x11_screen, gboolean *changed)
GdkRectangle geometry;
GdkRectangle newgeo;
char *name;
char *manufacturer = NULL;
int refresh_rate = 0;
gdk_x11_display_error_trap_push (display);
@ -405,6 +406,50 @@ init_randr15 (GdkX11Screen *x11_screen, gboolean *changed)
g_ptr_array_add (x11_display->monitors, monitor);
}
/* Fetch minimal manufacturer information (PNP ID) from EDID */
{
#define EDID_LENGTH 128
Atom actual_type, edid_atom;
char tmp[3];
int actual_format;
unsigned char *prop;
unsigned long nbytes, bytes_left;
Display *disp = GDK_DISPLAY_XDISPLAY (x11_display);
edid_atom = XInternAtom (disp, RR_PROPERTY_RANDR_EDID, FALSE);
XRRGetOutputProperty (disp, output,
edid_atom,
0,
EDID_LENGTH,
FALSE,
FALSE,
AnyPropertyType,
&actual_type,
&actual_format,
&nbytes,
&bytes_left,
&prop);
// Check partial EDID header (whole header: 00 ff ff ff ff ff ff 00)
if (nbytes >= EDID_LENGTH && prop[0] == 0x00 && prop[1] == 0xff)
{
/* decode the Vendor ID from three 5 bit words packed into 2 bytes
* /--08--\/--09--\
* 7654321076543210
* |\---/\---/\---/
* R C1 C2 C3 */
tmp[0] = 'A' + ((prop[8] & 0x7c) / 4) - 1;
tmp[1] = 'A' + ((prop[8] & 0x3) * 8) + ((prop[9] & 0xe0) / 32) - 1;
tmp[2] = 'A' + (prop[9] & 0x1f) - 1;
manufacturer = g_strndup (tmp, sizeof (tmp));
}
XFree(prop);
#undef EDID_LENGTH
}
gdk_monitor_get_geometry (GDK_MONITOR (monitor), &geometry);
name = g_strndup (output_info->name, output_info->nameLen);
@ -433,6 +478,8 @@ init_randr15 (GdkX11Screen *x11_screen, gboolean *changed)
gdk_monitor_set_scale_factor (GDK_MONITOR (monitor), x11_screen->surface_scale);
gdk_monitor_set_model (GDK_MONITOR (monitor), name);
gdk_monitor_set_connector (GDK_MONITOR (monitor), name);
gdk_monitor_set_manufacturer (GDK_MONITOR (monitor), manufacturer);
g_free (manufacturer);
g_free (name);
if (rr_monitors[i].primary)