Merge monitor_reconfigure into powerd.

monitor_reconfigure.cc

Index: monitor_reconfigure.cc
diff --git a/monitor_reconfigure.cc b/monitor_reconfigure.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b60c200518576c1b90facf47909e1fc1015f7dcf
--- /dev/null
+++ b/monitor_reconfigure.cc
@@ -0,0 +1,254 @@
+// Copyright (c) 2011 The Chromium OS 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 "power_manager/monitor_reconfigure.h"
+
+#include <algorithm>
+#include <cstdio>
+#include <cstdlib>
+
+#include "base/logging.h"
+#include "power_manager/backlight_controller.h"
+#include "power_manager/udev_controller.h"
+
+using std::sort;
+using std::vector;
+
+namespace {
+// Name of the internal output.
+const char kLcdOutputName[] = "LVDS1";
+// The screen DPI we pass to X11.
+const float kScreenDpi = 96.0;
+// An inch in mm.
+const float kInchInMm = 25.4;
+}
+
+namespace power_manager {
+
+void MonitorReconfigureDelegate::Run(GIOChannel* /* source */,
+                                     GIOCondition /* condition */) {
+  monitor_reconfigure_->Run();
+}
+
+MonitorReconfigure::MonitorReconfigure()
+    : display_(NULL),
+      window_(0),
+      lcd_output_(0),
+      lcd_output_info_(NULL),
+      external_output_(0),
+      external_output_info_(NULL),
+      backlight_ctl_(NULL),
+      delegate_(NULL),
+      controller_(NULL) {}
+
+MonitorReconfigure::MonitorReconfigure(
+    BacklightController* backlight_ctl)
+    : display_(NULL),
+      window_(0),
+      lcd_output_(0),
+      lcd_output_info_(NULL),
+      external_output_(0),
+      external_output_info_(NULL),
+      backlight_ctl_(backlight_ctl),
+      delegate_(NULL),
+      controller_(NULL) {}
+
+MonitorReconfigure::~MonitorReconfigure() {
+}
+
+bool MonitorReconfigure::Init() {
+  DCHECK(delegate_ == NULL);
+  delegate_ = new MonitorReconfigureDelegate(this);
+  controller_ = new UdevController(delegate_, "drm");
+  return controller_->Init();
+}
+
+void MonitorReconfigure::Run() {
+  lcd_output_ = 0;
+  lcd_output_info_ = NULL;
+  external_output_ = 0;
+  external_output_info_ = NULL;
+  display_ = XOpenDisplay(NULL);
+  CHECK(display_) << "Could not open display";
+
+  window_ = RootWindow(display_, DefaultScreen(display_));
+  screen_info_ = XRRGetScreenResources(display_, window_);
+
+  for (int i = 0; i < screen_info_->nmode; ++i) {
+    XRRModeInfo* current_mode = &screen_info_->modes[i];
+    mode_map_[current_mode->id] = current_mode;
+  }
+  DetermineOutputs();
+  vector<ResolutionSelector::Mode> lcd_modes;
+  SortModesByResolution(lcd_output_, &lcd_modes);
+  DCHECK(!lcd_modes.empty());
+
+  vector<ResolutionSelector::Mode> external_modes;
+  if (IsExternalMonitorConnected()) {
+    SortModesByResolution(external_output_, &external_modes);
+    DCHECK(!external_modes.empty());
+  }
+
+  ResolutionSelector selector;
+  ResolutionSelector::Mode lcd_resolution;
+  ResolutionSelector::Mode external_resolution;
+  ResolutionSelector::Mode screen_resolution;
+
+  CHECK(selector.FindBestResolutions(lcd_modes,
+                                     external_modes,
+                                     &lcd_resolution,
+                                     &external_resolution,
+                                     &screen_resolution));
+  CHECK(!lcd_resolution.name.empty() || !external_resolution.name.empty());
+
+  // Disable the backlight before resizing anything on the screen.
+  if (lcd_resolution.name.empty())
+    backlight_ctl_->SetPowerState(BACKLIGHT_ACTIVE_OFF);
+
+  // Grab the server during mode changes.
+  XGrabServer(display_);
+
+  // Disable the LCD if we were told to do so (because we're using a higher
+  // resolution that'd be clipped on the LCD).
+  // Otherwise enable the LCD if appropriate.
+  if (lcd_resolution.name.empty())
+    DisableDevice(lcd_output_info_);
+  else
+    SetDeviceResolution(lcd_output_, lcd_output_info_, lcd_resolution);
+
+  // If there's no external output connected, disable the device before we try
+  // to set the screen resolution; otherwise xrandr will complain if we're
+  // trying to set the screen to a smaller size than what the now-unplugged
+  // device was using.
+  // Otherwise enable the external device if appropriate.
+  if (external_resolution.name.empty())
+    DisableDevice(external_output_info_);
+  else
+    SetDeviceResolution(external_output_, external_output_info_,
+                        external_resolution);
+
+  // Set the fb resolution.
+  SetScreenResolution(screen_resolution);
+
+  // Now let the server go and sync all changes.
+  XUngrabServer(display_);
+  XSync(display_, False);
+
+  XRRFreeOutputInfo(lcd_output_info_);
+  XRRFreeOutputInfo(external_output_info_);
+  XRRFreeScreenResources(screen_info_);
+
+  // Enable the backlight. We do not want to do this before the resize is
+  // done so that we can hide the resize when going off->on.
+  if (!lcd_resolution.name.empty())
+    backlight_ctl_->SetPowerState(BACKLIGHT_ACTIVE_ON);
+
+  XCloseDisplay(display_);
+}
+
+void MonitorReconfigure::DetermineOutputs() {
+  CHECK(screen_info_->noutput > 1) << "Expected at least two outputs";
+  CHECK(!lcd_output_info_);
+  CHECK(!external_output_info_);
+
+  RROutput first_output = screen_info_->outputs[0];
+  RROutput second_output = screen_info_->outputs[1];
+
+  XRROutputInfo* first_output_info =
+      XRRGetOutputInfo(display_, screen_info_, first_output);
+  XRROutputInfo* second_output_info =
+      XRRGetOutputInfo(display_, screen_info_, second_output);
+
+  if (strcmp(first_output_info->name, kLcdOutputName) == 0) {
+    lcd_output_ = first_output;
+    lcd_output_info_ = first_output_info;
+    external_output_ = second_output;
+    external_output_info_ = second_output_info;
+  } else {
+    lcd_output_ = second_output;
+    lcd_output_info_ = second_output_info;
+    external_output_ = first_output;
+    external_output_info_ = first_output_info;
+  }
+
+  LOG(INFO) << "LCD name: " << lcd_output_info_->name << " (xid "
+            << lcd_output_ << ")";
+  for (int i = 0; i < lcd_output_info_->nmode; ++i) {
+    XRRModeInfo* mode = mode_map_[lcd_output_info_->modes[i]];
+    LOG(INFO) << "  Mode: " << mode->width << "x" << mode->height
+              << " (xid " << mode->id << ")";
+  }
+
+  LOG(INFO) << "External name: " << external_output_info_->name
+            << " (xid " << external_output_ << ")";
+  for (int i = 0; i < external_output_info_->nmode; ++i) {
+    XRRModeInfo* mode = mode_map_[external_output_info_->modes[i]];
+    LOG(INFO) << "  Mode: " << mode->width << "x" << mode->height
+              << " (xid " << mode->id << ")";
+  }
+}
+
+bool MonitorReconfigure::IsExternalMonitorConnected() {
+  return (external_output_info_->connection == RR_Connected);
+}
+
+void MonitorReconfigure::SortModesByResolution(
+    RROutput output,
+    vector<ResolutionSelector::Mode>* modes_out) {
+  modes_out->clear();
+
+  XRROutputInfo* output_info = XRRGetOutputInfo(display_, screen_info_, output);
+  for (int i = 0; i < output_info->nmode; ++i) {
+    const XRRModeInfo* mode = mode_map_[output_info->modes[i]];
+    DCHECK(mode);
+    LOG(INFO) << "Adding mode " << mode->width << " " << mode->height
+              << " (xid " << mode->id << ")";
+    modes_out->push_back(
+        ResolutionSelector::Mode(mode->width, mode->height, mode->name,
+                                 mode->id));
+  }
+
+  sort(modes_out->begin(), modes_out->end(),
+       ResolutionSelector::ModeResolutionComparator());
+
+  XRRFreeOutputInfo(output_info);
+}
+
+bool MonitorReconfigure::SetDeviceResolution(
+    RROutput output,
+    const XRROutputInfo* output_info,
+    const ResolutionSelector::Mode& resolution) {
+  Status s = XRRSetCrtcConfig(display_, screen_info_, output_info->crtcs[0],
+                              CurrentTime, 0, 0, resolution.id, RR_Rotate_0,
+                              &output, 1);
+  return (s == RRSetConfigSuccess);
+}
+
+bool MonitorReconfigure::SetScreenResolution(
+    const ResolutionSelector::Mode& resolution) {
+  LOG(INFO) << "Setting resolution " << resolution.name.c_str() << " "
+            << resolution.width << "x" << resolution.height;
+  // Do not switch resolutions if we don't need to, this avoids blinking.
+  int screen = DefaultScreen(display_);
+  if ( (resolution.width != DisplayWidth(display_, screen))||
+     (resolution.height != DisplayHeight(display_, screen)) )
+    XRRSetScreenSize(display_, window_,
+                     resolution.width,
+                     resolution.height,
+                     resolution.width * kInchInMm / kScreenDpi,
+                     resolution.height * kInchInMm / kScreenDpi);
+
+  return true;
+}
+
+bool MonitorReconfigure::DisableDevice(const XRROutputInfo* output_info) {
+  if (!output_info->crtc)
+    return true;
+  LOG(INFO) << "Disabling output " << output_info->name;
+  Status s = XRRSetCrtcConfig(display_, screen_info_, output_info->crtc,
+    CurrentTime, 0, 0, None, RR_Rotate_0, NULL, 0);
+  return (s == RRSetConfigSuccess);
+}
+
+}  // namespace power_manager