Overscan calibration UI.

chrome/browser/chromeos/display/overscan_calibrator.cc

+// Copyright (c) 2012 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 "chrome/browser/chromeos/display/overscan_calibrator.h"
+
+#include "ash/display/display_controller.h"
+#include "ash/shell.h"
+#include "ash/shell_window_ids.h"
+#include "base/callback.h"
+#include "chrome/browser/chromeos/display/display_preferences.h"
+#include "ui/aura/window.h"
+#include "ui/compositor/layer.h"
+#include "ui/gfx/canvas.h"
+
+namespace chromeos {
+
+OverscanCalibrator::OverscanCalibrator(
+    const gfx::Display& target_display, const gfx::Insets& initial_insets)
+    : display_(target_display), insets_(initial_insets) {
+  aura::RootWindow* root = ash::Shell::GetInstance()->display_controller()->
+      GetRootWindowForDisplayId(display_.id());
+  ui::Layer* parent_layer = ash::Shell::GetContainer(
+      root, ash::internal::kShellWindowId_OverlayContainer)->layer();
+
+  calibration_layer_.reset(new ui::Layer());
+  calibration_layer_->SetOpacity(0.5f);
+  calibration_layer_->SetBounds(parent_layer->bounds());
+  calibration_layer_->set_delegate(this);
+  parent_layer->Add(calibration_layer_.get());
+  // The initial size of |inner_bounds_| has to be same as the root because the
+  // root size already shrinks due to the current overscan settings.
+  inner_bounds_ = parent_layer->bounds();
+}
+
+OverscanCalibrator::~OverscanCalibrator() {
+}
+
+void OverscanCalibrator::Commit() {
+  SetDisplayOverscan(display_, insets_);
+}
+
+void OverscanCalibrator::UpdateInsets(const gfx::Insets& insets) {
+  // Has to undo the old |insets_| in order to apply the new |insets|.
+  inner_bounds_.Inset(-insets_);
+  inner_bounds_.Inset(insets);
+  insets_ = insets;
+  calibration_layer_->SchedulePaint(calibration_layer_->bounds());
+}
+
+void OverscanCalibrator::OnPaintLayer(gfx::Canvas* canvas) {
+  static const SkColor transparent = SkColorSetARGB(0, 0, 0, 0);
+  canvas->FillRect(calibration_layer_->bounds(), SK_ColorBLACK);
+  canvas->FillRect(inner_bounds_, transparent, SkXfermode::kClear_Mode);
+}
+
+void OverscanCalibrator::OnDeviceScaleFactorChanged(
+    float device_scale_factor) {
+  // TODO(mukai): Cancel the overscan calibration when the device
+  // configuration has changed.
+}
+
+base::Closure OverscanCalibrator::PrepareForLayerBoundsChange() {
+  return base::Closure();
+}
+
+}  // namespace chromeos