Make DisplayInfoProvider an interface

chrome/browser/extensions/api/system_display/display_info_provider_chromeos.cc

Index: chrome/browser/extensions/api/system_display/display_info_provider_chromeos.cc
diff --git a/chrome/browser/extensions/api/system_display/display_info_provider_chromeos.cc b/chrome/browser/extensions/api/system_display/display_info_provider_chromeos.cc
deleted file mode 100644
index 0aaf5249c1c5067de144c3abdd7acc49813359e5..0000000000000000000000000000000000000000
--- a/chrome/browser/extensions/api/system_display/display_info_provider_chromeos.cc
+++ /dev/null
@@ -1,386 +0,0 @@
-// Copyright 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 "chrome/browser/extensions/api/system_display/display_info_provider.h"
-
-#include "ash/display/display_controller.h"
-#include "ash/display/display_manager.h"
-#include "ash/shell.h"
-#include "base/message_loop/message_loop_proxy.h"
-#include "base/strings/string_number_conversions.h"
-#include "ui/gfx/display.h"
-#include "ui/gfx/point.h"
-#include "ui/gfx/rect.h"
-
-using ash::DisplayManager;
-
-namespace extensions {
-
-using api::system_display::Bounds;
-using api::system_display::DisplayUnitInfo;
-using api::system_display::DisplayProperties;
-using api::system_display::Insets;
-
-namespace {
-
-// TODO(hshi): determine the DPI of the screen.
-const float kDpi96 = 96.0;
-// Maximum allowed bounds origin absolute value.
-const int kMaxBoundsOrigin = 200 * 1000;
-
-// Checks if the given integer value is valid display rotation in degrees.
-bool IsValidRotationValue(int rotation) {
-  return rotation == 0 || rotation == 90 || rotation == 180 || rotation == 270;
-}
-
-// Converts integer integer value in degrees to Rotation enum value.
-gfx::Display::Rotation DegreesToRotation(int degrees) {
-  DCHECK(IsValidRotationValue(degrees));
-  switch (degrees) {
-    case 0:
-      return gfx::Display::ROTATE_0;
-    case 90:
-      return gfx::Display::ROTATE_90;
-    case 180:
-      return gfx::Display::ROTATE_180;
-    case 270:
-      return gfx::Display::ROTATE_270;
-    default:
-      return gfx::Display::ROTATE_0;
-  }
-}
-
-// Checks if the given point is over the radius vector described by it's end
-// point |vector|. The point is over a vector if it's on its positive (left)
-// side. The method sees a point on the same line as the vector as being over
-// the vector.
-bool PointIsOverRadiusVector(const gfx::Point& point,
-                             const gfx::Point& vector) {
-  // |point| is left of |vector| if its radius vector's scalar product with a
-  // vector orthogonal (and facing the positive side) to |vector| is positive.
-  //
-  // An orthogonal vector of (a, b) is (b, -a), as the scalar product of these
-  // two is 0.
-  // So, (x, y) is over (a, b) if x * b + y * (-a) >= 0, which is equivalent to
-  // x * b >= y * a.
-  return static_cast<int64>(point.x()) * static_cast<int64>(vector.y()) >=
-      static_cast<int64>(point.y()) * static_cast<int64>(vector.x());
-}
-
-// Created ash::DisplayLayout value for |rectangle| compared to the |reference|
-// rectangle.
-// The layout consists of two values:
-//   - position: Whether the rectangle is positioned left, right, over or under
-//     the reference.
-//   - offset: The rectangle's offset from the reference origin along the axis
-//     opposite the position direction (if the rectangle is left or right along
-//     y-axis, otherwise along x-axis).
-// The rectangle's position is calculated by dividing the space in areas defined
-// by the |reference|'s diagonals and finding the area |rectangle|'s center
-// point belongs. If the |rectangle| in the calculated layout does not share a
-// part of the bounds with the |reference|, the |rectangle| position in set to
-// the more suitable neighboring position (e.g. if |rectangle| is completely
-// over the |reference| top bound, it will be set to TOP) and the layout is
-// recalculated with the new position. This is to handle case where the
-// rectangle shares an edge with the reference, but it's center is not in the
-// same area as the reference's edge, e.g.
-//
-// +---------------------+
-// |                     |
-// | REFERENCE           |
-// |                     |
-// |                     |
-// +---------------------+
-//                 +-------------------------------------------------+
-//                 | RECTANGLE               x                       |
-//                 +-------------------------------------------------+
-//
-// The rectangle shares an egde with the reference's bottom edge, but it's
-// center point is in the left area.
-ash::DisplayLayout GetLayoutForRectangles(const gfx::Rect& reference,
-                                          const gfx::Rect& rectangle) {
-  // Translate coordinate system so origin is in the reference's top left point
-  // (so the reference's down-diagonal vector starts in the (0, 0)) and scale it
-  // up by two (to avoid division when calculating the rectangle's center
-  // point).
-  gfx::Point center(2 * (rectangle.x() - reference.x()) + rectangle.width(),
-                    2 * (rectangle.y() - reference.y()) + rectangle.height());
-  gfx::Point down_diag(2 * reference.width(), 2 * reference.height());
-
-  bool is_top_right = PointIsOverRadiusVector(center, down_diag);
-
-  // Translate the coordinating system again, so the bottom right point of the
-  // reference is origin (so the references up-diagonal starts at (0, 0)).
-  // Note that the coordinate system is scaled by 2.
-  center.Offset(0, -2 * reference.height());
-  // Choose the vector orientation so the points on the diagonal are considered
-  // to be left.
-  gfx::Point up_diag(-2 * reference.width(), 2 * reference.height());
-
-  bool is_bottom_right = PointIsOverRadiusVector(center, up_diag);
-
-  ash::DisplayLayout::Position position;
-  if (is_top_right) {
-    position = is_bottom_right ? ash::DisplayLayout::RIGHT :
-                                 ash::DisplayLayout::TOP;
-  } else {
-    position =
-        is_bottom_right ? ash::DisplayLayout::BOTTOM : ash::DisplayLayout::LEFT;
-  }
-
-  // If the rectangle with the calculated position would not have common side
-  // with the reference, try to position it so it shares another edge with the
-  // reference.
-  if (is_top_right == is_bottom_right) {
-    if (rectangle.y() > reference.y() + reference.height()) {
-      // The rectangle is left or right, but completely under the reference.
-      position = ash::DisplayLayout::BOTTOM;
-    } else if (rectangle.y() + rectangle.height() < reference.y()) {
-      // The rectangle is left or right, but completely over the reference.
-      position = ash::DisplayLayout::TOP;
-    }
-  } else {
-    if (rectangle.x() > reference.x() + reference.width()) {
-      // The rectangle is over or under, but completely right of the reference.
-      position = ash::DisplayLayout::RIGHT;
-    } else if (rectangle.x() + rectangle.width() < reference.x()) {
-      // The rectangle is over or under, but completely left of the reference.
-      position = ash::DisplayLayout::LEFT;
-    }
-  }
-
-  if (position == ash::DisplayLayout::LEFT ||
-      position == ash::DisplayLayout::RIGHT) {
-    return ash::DisplayLayout::FromInts(position, rectangle.y());
-  } else {
-    return ash::DisplayLayout::FromInts(position, rectangle.x());
-  }
-}
-
-// Updates the display layout for the target display in reference to the primary
-// display.
-void UpdateDisplayLayout(const gfx::Rect& primary_display_bounds,
-                         int primary_display_id,
-                         const gfx::Rect& target_display_bounds,
-                         int target_display_id) {
-  ash::DisplayLayout layout = GetLayoutForRectangles(primary_display_bounds,
-                                                     target_display_bounds);
-  ash::Shell::GetInstance()->display_manager()->
-      SetLayoutForCurrentDisplays(layout);
-}
-
-// Validates that parameters passed to the SetInfo function are valid for the
-// desired display and the current display manager state.
-// Returns whether the parameters are valid. On failure |error| is set to the
-// error message.
-bool ValidateParamsForDisplay(const DisplayProperties& info,
-                              const gfx::Display& display,
-                              DisplayManager* display_manager,
-                              int64 primary_display_id,
-                              std::string* error) {
-  bool is_primary = display.id() == primary_display_id ||
-                    (info.is_primary && *info.is_primary);
-
-  // If mirroring source id is set, a display with the given id should exist,
-  // and if should not be the same as the target display's id.
-  if (info.mirroring_source_id && !info.mirroring_source_id->empty()) {
-    int64 mirroring_id;
-    if (!base::StringToInt64(*info.mirroring_source_id, &mirroring_id) ||
-        display_manager->GetDisplayForId(mirroring_id).id() ==
-            gfx::Display::kInvalidDisplayID) {
-      *error = "Display " + *info.mirroring_source_id + " not found.";
-      return false;
-    }
-
-    if (*info.mirroring_source_id == base::Int64ToString(display.id())) {
-      *error = "Not allowed to mirror self.";
-      return false;
-    }
-  }
-
-  // If mirroring source parameter is specified, no other parameter should be
-  // set as when the mirroring is applied the display list could change.
-  if (info.mirroring_source_id && (info.is_primary || info.bounds_origin_x ||
-      info.bounds_origin_y || info.rotation || info.overscan)) {
-    *error = "No other parameter should be set alongside mirroringSourceId.";
-    return false;
-  }
-
-  // The bounds cannot be changed for the primary display and should be inside
-  // a reasonable bounds. Note that the display is considered primary if the
-  // info has 'isPrimary' parameter set, as this will be applied before bounds
-  // origin changes.
-  if (info.bounds_origin_x || info.bounds_origin_y) {
-    if (is_primary) {
-      *error = "Bounds origin not allowed for the primary display.";
-      return false;
-    }
-    if (info.bounds_origin_x &&
-        (*info.bounds_origin_x > kMaxBoundsOrigin ||
-         *info.bounds_origin_x < -kMaxBoundsOrigin)) {
-      *error = "Bounds origin x out of bounds.";
-      return false;
-    }
-    if (info.bounds_origin_y &&
-        (*info.bounds_origin_y > kMaxBoundsOrigin ||
-         *info.bounds_origin_y < -kMaxBoundsOrigin)) {
-      *error = "Bounds origin y out of bounds.";
-      return false;
-    }
-  }
-
-  // Verify the rotation value is valid.
-  if (info.rotation && !IsValidRotationValue(*info.rotation)) {
-    *error = "Invalid rotation.";
-    return false;
-  }
-
-  // Overscan cannot be changed for the internal display, and should be at most
-  // half of the screen size.
-  if (info.overscan) {
-    if (display.IsInternal()) {
-      *error = "Overscan changes not allowed for the internal monitor.";
-      return false;
-    }
-
-    if (info.overscan->left < 0 || info.overscan->top < 0 ||
-        info.overscan->right < 0 || info.overscan->bottom < 0) {
-      *error = "Negative overscan not allowed.";
-      return false;
-    }
-
-    const gfx::Insets overscan =
-        display_manager->GetOverscanInsets(display.id());
-    int screen_width = display.bounds().width() + overscan.width();
-    int screen_height = display.bounds().height() + overscan.height();
-
-    if ((info.overscan->left + info.overscan->right) * 2 > screen_width) {
-      *error = "Horizontal overscan is more than half of the screen width.";
-      return false;
-    }
-
-    if ((info.overscan->top + info.overscan->bottom) * 2 > screen_height) {
-      *error = "Vertical overscan is more than half of the screen height.";
-      return false;
-    }
-  }
-  return true;
-}
-
-// Gets the display with the provided string id.
-gfx::Display GetTargetDisplay(const std::string& display_id_str,
-                              DisplayManager* manager) {
-  int64 display_id;
-  if (!base::StringToInt64(display_id_str, &display_id)) {
-    // This should return invalid display.
-    return gfx::Display();
-  }
-  return manager->GetDisplayForId(display_id);
-}
-
-// Updates the display with |display_id_str| id according to |info|. Returns
-// whether the display was successfully updated. On failure, no display
-// parameters should be changed, and |error| should be set to the error string.
-bool SetInfoImpl(const std::string& display_id_str,
-                 const DisplayProperties& info,
-                 std::string* error) {
-  DisplayManager* display_manager =
-      ash::Shell::GetInstance()->display_manager();
-  DCHECK(display_manager);
-  ash::DisplayController* display_controller =
-      ash::Shell::GetInstance()->display_controller();
-  DCHECK(display_controller);
-
-  const gfx::Display target = GetTargetDisplay(display_id_str, display_manager);
-
-  if (target.id() == gfx::Display::kInvalidDisplayID) {
-    *error = "Display not found.";
-    return false;
-  }
-
-  int64 display_id = target.id();
-  // TODO(scottmg): Native is wrong http://crbug.com/133312
-  const gfx::Display& primary =
-      gfx::Screen::GetNativeScreen()->GetPrimaryDisplay();
-
-  if (!ValidateParamsForDisplay(info, target, display_manager, primary.id(),
-                                error)) {
-    return false;
-  }
-
-  // Process 'isPrimary' parameter.
-  if (info.is_primary && *info.is_primary && target.id() != primary.id())
-    display_controller->SetPrimaryDisplayId(display_id);
-
-  // Process 'mirroringSourceId' parameter.
-  if (info.mirroring_source_id &&
-      info.mirroring_source_id->empty() == display_manager->IsMirrored()) {
-    display_controller->ToggleMirrorMode();
-  }
-
-  // Process 'overscan' parameter.
-  if (info.overscan) {
-    display_manager->SetOverscanInsets(
-        display_id,
-        gfx::Insets(info.overscan->top, info.overscan->left,
-                    info.overscan->bottom, info.overscan->right));
-  }
-
-  // Process 'rotation' parameter.
-  if (info.rotation) {
-    display_manager->SetDisplayRotation(display_id,
-                                        DegreesToRotation(*info.rotation));
-  }
-
-  // Process new display origin parameters.
-  gfx::Point new_bounds_origin = target.bounds().origin();
-  if (info.bounds_origin_x)
-    new_bounds_origin.set_x(*info.bounds_origin_x);
-  if (info.bounds_origin_y)
-    new_bounds_origin.set_y(*info.bounds_origin_y);
-
-  if (new_bounds_origin != target.bounds().origin()) {
-    gfx::Rect target_bounds = target.bounds();
-    target_bounds.Offset(new_bounds_origin.x() - target.bounds().x(),
-                         new_bounds_origin.y() - target.bounds().y());
-    UpdateDisplayLayout(primary.bounds(), primary.id(),
-                        target_bounds, target.id());
-  }
-
-  return true;
-}
-
-}  // namespace
-
-bool DisplayInfoProvider::SetInfo(const std::string& display_id,
-                                  const DisplayProperties& info,
-                                  std::string* error) {
-  return SetInfoImpl(display_id, info, error);
-}
-
-void DisplayInfoProvider::UpdateDisplayUnitInfoForPlatform(
-    const gfx::Display& display,
-    extensions::api::system_display::DisplayUnitInfo* unit) {
-
-  ash::DisplayManager* display_manager =
-      ash::Shell::GetInstance()->display_manager();
-  unit->name = display_manager->GetDisplayNameForId(display.id());
-  if (display_manager->IsMirrored()) {
-    unit->mirroring_source_id =
-        base::Int64ToString(display_manager->mirrored_display_id());
-  }
-
-  const float dpi = display.device_scale_factor() * kDpi96;
-  unit->dpi_x = dpi;
-  unit->dpi_y = dpi;
-
-  const gfx::Insets overscan_insets =
-      display_manager->GetOverscanInsets(display.id());
-  unit->overscan.left = overscan_insets.left();
-  unit->overscan.top = overscan_insets.top();
-  unit->overscan.right = overscan_insets.right();
-  unit->overscan.bottom = overscan_insets.bottom();
-}
-
-}  // namespace extensions