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());
+  inner_bounds_ = parent_layer->bounds();
+}
+
+OverscanCalibrator::~OverscanCalibrator() {
+}
+
+void OverscanCalibrator::Finish() {
+  calibration_layer_.reset();
+}
+
+void OverscanCalibrator::Commit() {
+  SetDisplayOverscan(display_, insets_);
+}
+
+void OverscanCalibrator::UpdateInsets(const gfx::Insets& insets) {
+  inner_bounds_.Inset(insets_.Scale(-1));
+  inner_bounds_.Inset(insets);

[oshima, 2012/10/19 19:36:11]

Why this is necessary? Can you add comment?

[Jun Mukai, 2012/10/19 21:39:34]

added.

+  insets_ = insets;
+  calibration_layer_->SchedulePaint(calibration_layer_->bounds());
+}
+
+void OverscanCalibrator::OnPaintLayer(gfx::Canvas* canvas) {
+  canvas->FillRect(calibration_layer_->bounds(), SK_ColorBLACK);
+  const SkColor transparent = SkColorSetARGB(0, 0, 0, 0);

[oshima, 2012/10/19 19:36:11]

static const
and move to the beginning
I actually wonder if there is a layer API that punch a hole on layer (android's
compositor had one). Can you ask piman?

[Jun Mukai, 2012/10/19 21:39:34]

done for static const.  I'll ask piman, thanks.

[Jun Mukai, 2012/10/19 22:18:12]

Just for recording: I asked piman for this, but no such mechanism in ui::Layer. 
So going with LayerDelegate would be the only way for now.

+  canvas->FillRect(inner_bounds_, transparent, SkXfermode::kClear_Mode);
+}
+
+void OverscanCalibrator::OnDeviceScaleFactorChanged(
+    float device_scale_factor) {

[oshima, 2012/10/19 19:36:11]

We probably should cancel the operation when display
configuration has changed. Can you add TODO?

[Jun Mukai, 2012/10/19 21:39:34]

added TODO.

+}
+
+base::Closure OverscanCalibrator::PrepareForLayerBoundsChange() {
+  return base::Closure();
+}
+
+}  // namespace chromeos