[gnome-control-center/wip/garnacho/wayland-tablet: 14/31] wacom: Add display mapping API to CcWacomDevice

[Carlos Garnacho <carlosg src gnome org>]

commit e30dec7417f0765b88cc1b83303c71864cdc1d07
Author: Carlos Garnacho <carlosg gnome org>
Date:   Mon Jun 6 14:41:16 2016 +0200

    wacom: Add display mapping API to CcWacomDevice
    
    This can only be used for tablets that are not display nor system
    integrated (eg. intuos models). The mapping of tablets with a builtin
    display remain in g-s-d/GsdDeviceMapper.

 panels/wacom/cc-wacom-device.c |  133 ++++++++++++++++++++++++++++++++++++++++
 panels/wacom/cc-wacom-device.h |    8 +++
 2 files changed, 141 insertions(+), 0 deletions(-)
---
diff --git a/panels/wacom/cc-wacom-device.c b/panels/wacom/cc-wacom-device.c
index ed1936c..3d91632 100644
--- a/panels/wacom/cc-wacom-device.c
+++ b/panels/wacom/cc-wacom-device.c
@@ -233,3 +233,136 @@ cc_wacom_device_get_supported_tools (CcWacomDevice *device,
 
        return libwacom_get_supported_styli (device->wdevice, n_tools);
 }
+
+static GnomeRROutput *
+find_output_by_edid (GnomeRRScreen *rr_screen,
+                    const gchar   *vendor,
+                    const gchar   *product,
+                    const gchar   *serial)
+{
+       GnomeRROutput **rr_outputs;
+       GnomeRROutput *retval = NULL;
+       guint i;
+
+       rr_outputs = gnome_rr_screen_list_outputs (rr_screen);
+
+       for (i = 0; rr_outputs[i] != NULL; i++) {
+               gchar *o_vendor, *o_product, *o_serial;
+               gboolean match;
+
+               gnome_rr_output_get_ids_from_edid (rr_outputs[i],
+                                                  &o_vendor,
+                                                  &o_product,
+                                                  &o_serial);
+
+               g_debug ("Checking for match between '%s','%s','%s' and '%s','%s','%s'", \
+                        vendor, product, serial, o_vendor, o_product, o_serial);
+
+               match = (vendor  == NULL || g_strcmp0 (vendor,  o_vendor)  == 0) && \
+                       (product == NULL || g_strcmp0 (product, o_product) == 0) && \
+                       (serial  == NULL || g_strcmp0 (serial,  o_serial)  == 0);
+
+               g_free (o_vendor);
+               g_free (o_product);
+               g_free (o_serial);
+
+               if (match) {
+                       retval = rr_outputs[i];
+                       break;
+               }
+       }
+
+       if (retval == NULL)
+               g_debug ("Did not find a matching output for EDID '%s,%s,%s'",
+                        vendor, product, serial);
+
+       return retval;
+}
+
+static GnomeRROutput *
+find_output (GnomeRRScreen *rr_screen,
+            CcWacomDevice *device)
+{
+       GSettings *settings;
+       GVariant *variant;
+       const gchar **edid;
+       GnomeRROutput *ret = NULL;
+       gsize n;
+
+       settings = cc_wacom_device_get_settings (device);
+       variant = g_settings_get_value (settings, "display");
+       edid = g_variant_get_strv (variant, &n);
+
+       if (n != 3) {
+               g_critical ("Expected 'display' key to store %d values; got %"G_GSIZE_FORMAT".", 3, n);
+               goto out;
+       }
+
+       if (strlen (edid[0]) == 0 || strlen (edid[1]) == 0 || strlen (edid[2]) == 0)
+               goto out;
+
+       ret = find_output_by_edid (rr_screen, edid[0], edid[1], edid[2]);
+
+out:
+       g_free (edid);
+       g_variant_unref (variant);
+       g_object_unref (settings);
+
+       return ret;
+}
+
+GnomeRROutput *
+cc_wacom_device_get_output (CcWacomDevice *device,
+                           GnomeRRScreen *rr_screen)
+{
+       GnomeRROutput *rr_output;
+       GnomeRRCrtc *crtc;
+
+        g_return_val_if_fail (CC_IS_WACOM_DEVICE (device), NULL);
+        g_return_val_if_fail (GNOME_IS_RR_SCREEN (rr_screen), NULL);
+
+       rr_output = find_output (rr_screen, device);
+       if (rr_output == NULL) {
+               return NULL;
+       }
+
+       crtc = gnome_rr_output_get_crtc (rr_output);
+
+       if (!crtc || gnome_rr_crtc_get_current_mode (crtc) == NULL) {
+               g_debug ("Output is not active.");
+               return NULL;
+       }
+
+       return rr_output;
+}
+
+void
+cc_wacom_device_set_output (CcWacomDevice *device,
+                           GnomeRROutput *output)
+{
+       GSettings *settings;
+       gchar *vendor, *product, *serial;
+       const gchar *values[] = { "", "", "", NULL };
+
+        g_return_if_fail (CC_IS_WACOM_DEVICE (device));
+
+       vendor = product = serial = NULL;
+       settings = cc_wacom_device_get_settings (device);
+
+       if (output != NULL) {
+               gnome_rr_output_get_ids_from_edid (output,
+                                                  &vendor,
+                                                  &product,
+                                                  &serial);
+               values[0] = vendor;
+               values[1] = product;
+               values[2] = serial;
+       }
+
+       g_settings_set_strv (settings, "display", values);
+
+       g_free (vendor);
+       g_free (product);
+       g_free (serial);
+       g_object_unref (settings);
+}
diff --git a/panels/wacom/cc-wacom-device.h b/panels/wacom/cc-wacom-device.h
index 1fb721b..e2f76a7 100644
--- a/panels/wacom/cc-wacom-device.h
+++ b/panels/wacom/cc-wacom-device.h
@@ -26,6 +26,9 @@
 
 #include "gsd-device-manager.h"
 
+#define GNOME_DESKTOP_USE_UNSTABLE_API
+#include <libgnome-desktop/gnome-rr.h>
+
 #define CC_TYPE_WACOM_DEVICE (cc_wacom_device_get_type ())
 
 G_DECLARE_FINAL_TYPE (CcWacomDevice, cc_wacom_device, CC, WACOM_DEVICE, GObject)
@@ -49,4 +52,9 @@ GSettings     * cc_wacom_device_get_settings    (CcWacomDevice *device);
 const gint    * cc_wacom_device_get_supported_tools (CcWacomDevice *device,
                                                     gint          *n_tools);
 
+GnomeRROutput * cc_wacom_device_get_output      (CcWacomDevice *device,
+                                                GnomeRRScreen *screen);
+void            cc_wacom_device_set_output      (CcWacomDevice *wacom_device,
+                                                GnomeRROutput *monitor);
+
 #endif /* __CC_WACOM_DEVICE_H__ */