Pepper API implementation for output protection.

chromeos/display/real_output_configurator_delegate.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chromeos/display/real_output_configurator_delegate.h"
 
 #include <X11/Xatom.h>
 #include <X11/Xlib.h>
 #include <X11/extensions/dpms.h>
 #include <X11/extensions/XInput.h>
 #include <X11/extensions/XInput2.h>
 #include <X11/extensions/Xrandr.h>
 
 #include <cmath>
 #include <set>
 #include <utility>
 
 #include "base/logging.h"
 #include "base/message_loop/message_pump_x11.h"
+#include "base/x11/x11_error_tracker.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "chromeos/dbus/power_manager_client.h"
 #include "chromeos/display/output_util.h"
 
 namespace chromeos {
 
 namespace {
 
 // DPI measurements.
 const float kMmInInch = 25.4;
 const float kDpi96 = 96.0;
 const float kPixelsToMmScale = kMmInInch / kDpi96;
 
+// Prefixes of output name
+const char kOutputName_VGA[] = "VGA";
+const char kOutputName_HDMI[] = "HDMI";
+const char kOutputName_DVI[] = "DVI";
+const char kOutputName_DisplayPort[] = "DP";
+
+const char kContentProtectionAtomName[] = "Content Protection";
+const char kProtectionUndesiredAtomName[] = "Undesired";
+const char kProtectionDesiredAtomName[] = "Desired";
+const char kProtectionEnabledAtomName[] = "Enabled";
+
 bool IsInternalOutput(const XRROutputInfo* output_info) {
   return IsInternalOutputName(std::string(output_info->name));
 }
 
 RRMode GetOutputNativeMode(const XRROutputInfo* output_info) {
   return output_info->nmode > 0 ? output_info->modes[0] : None;
 }
 
 }  // namespace
 
@@ skipping 253 matching lines @@
 
   for (int i = 0; i < info->nmode; ++i) {
     const RRMode mode = info->modes[i];
     OutputConfigurator::ModeInfo mode_info;
     if (InitModeInfo(mode, &mode_info))
       output.mode_infos.insert(std::make_pair(mode, mode_info));
     else
       LOG(WARNING) << "Unable to find XRRModeInfo for mode " << mode;
   }
 
+  std::string name(info->name);
+  if (output.is_internal) {
+    output.type = OUTPUT_TYPE_INTERNAL;
+  } else if (name.find(kOutputName_VGA) == 0) {
+    output.type = OUTPUT_TYPE_VGA;
+  } else if (name.find(kOutputName_HDMI) == 0) {
+    output.type = OUTPUT_TYPE_HDMI;
+  } else if (name.find(kOutputName_DVI) == 0) {
+    output.type = OUTPUT_TYPE_DVI;
+  } else if (name.find(kOutputName_DisplayPort) == 0) {
+    output.type = OUTPUT_TYPE_DISPLAYPORT;
+  } else {
+    LOG(ERROR) << "Unknown link type: " << name;
+    output.type = OUTPUT_TYPE_UNKNOWN;
+  }
+
   return output;
 }
 
+bool RealOutputConfiguratorDelegate::GetHDCPState(RROutput id,
+                                                  HDCPState* state) {
+  unsigned char* values = NULL;
+  int actual_format = 0;
+  unsigned long nitems = 0;
+  unsigned long bytes_after = 0;
+  Atom actual_type = None;
+  int success = 0;
+  Atom prop = XInternAtom(display_, kContentProtectionAtomName, False);

[Daniel Erat, 2013/09/23 19:31:43]

nit: please add a TODO to update all of this code to use X11AtomCache instead of
making a bunch of round trips to the server every time this is called

[kcwu, 2013/09/24 13:55:06]

Done.

+
+  bool ok = true;
+  // TODO(kcwu): Move this to x11_util (similar method calls in this file and
+  // output_util.cc)
+  success = XRRGetOutputProperty(display_, id, prop, 0, 100, False,
+                                 False, AnyPropertyType, &actual_type,
+                                 &actual_format, &nitems, &bytes_after,
+                                 &values);
+  if (actual_type == None) {
+    LOG(ERROR) << "Property '" << kContentProtectionAtomName <<
+        "' does not exist";

[Daniel Erat, 2013/09/23 19:31:43]

nit: indent multi-line logging statements like this:

  LOG(ERROR) << "Some string " << a_variable
             << " another string " << ...;

[kcwu, 2013/09/24 13:55:06]

Done.

+    ok = false;
+  } else if (success == Success && actual_type == XA_ATOM &&
+             actual_format == 32 && nitems == 1) {
+    Atom value = reinterpret_cast<Atom*>(values)[0];
+    if (value == XInternAtom(display_, kProtectionUndesiredAtomName, False)) {
+      *state = HDCP_STATE_UNDESIRED;
+    } else if (value == XInternAtom(display_, kProtectionDesiredAtomName,
+                                    False)) {
+      *state = HDCP_STATE_DESIRED;
+    } else if (value == XInternAtom(display_, kProtectionEnabledAtomName,
+                                    False)) {
+      *state = HDCP_STATE_ENABLED;
+    } else {
+      LOG(ERROR) << "Unknown " << kContentProtectionAtomName << " value: " <<

[Daniel Erat, 2013/09/23 19:31:43]

nit: fix indenting here too

[kcwu, 2013/09/24 13:55:06]

Done.

+          value;
+      ok = false;
+    }
+  } else {
+    LOG(ERROR) << "XRRGetOutputProperty failed";
+    ok = false;
+  }
+  if (values)
+    XFree(values);
+
+  VLOG(3) << "HDCP state: " << ok << "," << *state;
+  return ok;
+}
+
+bool RealOutputConfiguratorDelegate::SetHDCPState(RROutput id,
+                                                  HDCPState state) {
+  Atom name = XInternAtom(display_, "Content Protection", False);

[Daniel Erat, 2013/09/23 19:31:43]

kContentProtectionAtomName

[kcwu, 2013/09/24 13:55:06]

Done.

+  Atom value;

[Daniel Erat, 2013/09/23 19:31:43]

nit: initialize this to None in case so it doesn't contain garbage if someone
introduces a bug later

[kcwu, 2013/09/24 13:55:06]

Done.

+  switch (state) {
+    case HDCP_STATE_UNDESIRED:
+      value = XInternAtom(display_, kProtectionUndesiredAtomName, False);
+      break;
+    case HDCP_STATE_DESIRED:
+      value = XInternAtom(display_, kProtectionDesiredAtomName, False);
+      break;
+    default:
+      NOTREACHED() << "Invalid HDCP state: " << state;
+      return false;
+  }
+  base::X11ErrorTracker err_tracker;
+  unsigned char *data = reinterpret_cast<unsigned char*>(&value);
+  XRRChangeOutputProperty(display_, id, name, XA_ATOM, 32,
+                          PropModeReplace, data, 1);
+  if (err_tracker.FoundNewError()) {
+    LOG(ERROR) << "XRRChangeOutputProperty failed";
+    return false;
+  } else {
+    return true;
+  }
+}
+
 void RealOutputConfiguratorDelegate::DestroyUnusedCrtcs(
     const std::vector<OutputConfigurator::OutputSnapshot>& outputs) {
   CHECK(screen_) << "Server not grabbed";
   // Setting the screen size will fail if any CRTC doesn't fit afterwards.
   // At the same time, turning CRTCs off and back on uses up a lot of time.
   // This function tries to be smart to avoid too many off/on cycles:
   // - We disable all the CRTCs we won't need after the FB resize.
   // - We set the new modes on CRTCs, if they fit in both the old and new
   //   FBs, and park them at (0,0)
   // - We disable the CRTCs we will need but don't fit in the old FB. Those
@@ skipping 181 matching lines @@
                 << (*outputs)[i].touch_device_id << " to output #" << i;
         break;
       }
     }
   }
 
   XIFreeDeviceInfo(info);
 }
 
 }  // namespace chromeos