content/renderer/render_widget_screen_metrics_emulator.cc

// Copyright 2016 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 "content/renderer/render_widget_screen_metrics_emulator.h"

#include "base/numerics/safe_conversions.h"
#include "content/public/common/untrustworthy_context_menu_params.h"
#include "content/renderer/render_widget_screen_metrics_emulator_delegate.h"

namespace content {

RenderWidgetScreenMetricsEmulator::RenderWidgetScreenMetricsEmulator(
    RenderWidgetScreenMetricsEmulatorDelegate* delegate,
    const blink::ScreenInfo& screen_info,
    const gfx::Size& widget_size,
    const gfx::Size& visible_viewport_size,
    const gfx::Rect& view_screen_rect,
    const gfx::Rect& window_screen_rect)
    : delegate_(delegate),
      original_screen_info_(screen_info),
      original_widget_size_(widget_size),
      original_visible_viewport_size_(visible_viewport_size),
      original_view_screen_rect_(view_screen_rect),
      original_window_screen_rect_(window_screen_rect) {}

RenderWidgetScreenMetricsEmulator::~RenderWidgetScreenMetricsEmulator() =
    default;

void RenderWidgetScreenMetricsEmulator::DisableAndApply() {
  delegate_->SetScreenMetricsEmulationParameters(false, emulation_params_);
  delegate_->SetScreenRects(original_view_screen_rect_,
                            original_window_screen_rect_);
  delegate_->SetScreenInfoAndSize(original_screen_info_, original_widget_size_,
                                  original_visible_viewport_size_);
}

void RenderWidgetScreenMetricsEmulator::ChangeEmulationParams(
    const blink::WebDeviceEmulationParams& params) {
  emulation_params_ = params;
  Apply();
}

gfx::Point RenderWidgetScreenMetricsEmulator::ViewRectOrigin() {
  gfx::Point widget_pos = original_view_rect().origin();
  if (emulation_params_.view_position)
    widget_pos = *emulation_params_.view_position;
  else if (!emulating_desktop())
    widget_pos = gfx::Point();
  return widget_pos;
}

void RenderWidgetScreenMetricsEmulator::Apply() {
  // The WidgetScreenRect gets derived from the widget size of the main frame
  // widget, not from the original WidgetScreenRect.
  gfx::Size widget_size = original_widget_size_;
  // The WindowScreenRect gets derived from the original WindowScreenRect,
  // though.
  gfx::Size window_size = original_window_rect().size();

  // If either the width or height are specified by the emulator, then we use
  // that size, and assume that they have the scale pre-applied to them.
  if (emulation_params_.view_size.width) {
    widget_size.set_width(emulation_params_.view_size.width);
  } else {
    widget_size.set_width(
        base::Round(widget_size.width() / emulation_params_.scale));
  }
  if (emulation_params_.view_size.height) {
    widget_size.set_height(emulation_params_.view_size.height);
  } else {
    widget_size.set_height(
        base::Round(widget_size.height() / emulation_params_.scale));
  }

  // For mobile emulation, the window size is changed to match the widget size,
  // as there are no window decorations around the widget.
  if (!emulating_desktop())
    window_size = widget_size;

  gfx::Point widget_pos = original_view_rect().origin();
  gfx::Point window_pos = original_window_rect().origin();

  if (emulation_params_.view_position) {
    // The emulated widget position overrides the widget and window positions.
    widget_pos = *emulation_params_.view_position;
    window_pos = widget_pos;
  } else if (!emulating_desktop()) {
    // For mobile emulation, the widget and window are moved to 0,0 if not
    // explicitly specified.
    widget_pos = gfx::Point();
    window_pos = widget_pos;
  }

  gfx::Rect screen_rect = original_screen_info().rect;

  if (!emulation_params_.screen_size.IsEmpty()) {
    // The emulated screen size overrides the real one, and moves the screen's
    // origin to 0,0.
    screen_rect = gfx::Rect(emulation_params_.screen_size);
  } else if (!emulating_desktop()) {
    // For mobile emulation, the screen is adjusted to match the position and
    // size of the widget rect, if not explicitly specified.
    screen_rect = gfx::Rect(widget_pos, widget_size);
  }

  float device_scale_factor = original_screen_info().device_scale_factor;

  if (emulation_params_.device_scale_factor)
    device_scale_factor = emulation_params_.device_scale_factor;

  blink::mojom::ScreenOrientation orientation_type =
      original_screen_info().orientation_type;
  uint16_t orientation_angle = original_screen_info().orientation_angle;
  if (emulation_params_.screen_orientation_type !=
      blink::mojom::ScreenOrientation::kUndefined) {
    orientation_type = emulation_params_.screen_orientation_type;
    orientation_angle = emulation_params_.screen_orientation_angle;
  }

  // Pass three emulation parameters to the blink side:
  // - we keep the real device scale factor in compositor to produce sharp image
  //   even when emulating different scale factor;
  blink::WebDeviceEmulationParams modified_emulation_params = emulation_params_;
  modified_emulation_params.device_scale_factor =
      original_screen_info().device_scale_factor;
  delegate_->SetScreenMetricsEmulationParameters(true,
                                                 modified_emulation_params);

  delegate_->SetScreenRects(gfx::Rect(widget_pos, widget_size),
                            gfx::Rect(window_pos, window_size));

  blink::ScreenInfo screen_info = original_screen_info();
  screen_info.device_scale_factor = device_scale_factor;
  screen_info.rect = screen_rect;
  screen_info.available_rect = screen_rect;
  screen_info.orientation_type = orientation_type;
  screen_info.orientation_angle = orientation_angle;
  delegate_->SetScreenInfoAndSize(screen_info, /*widget_size=*/widget_size,
                                  /*visible_viewport_size=*/widget_size);
}

void RenderWidgetScreenMetricsEmulator::OnSynchronizeVisualProperties(
    const blink::ScreenInfo& screen_info,
    const gfx::Size& widget_size,
    const gfx::Size& visible_viewport_size) {
  original_screen_info_ = screen_info;
  original_widget_size_ = widget_size;
  original_visible_viewport_size_ = visible_viewport_size;
  Apply();
}

void RenderWidgetScreenMetricsEmulator::OnUpdateScreenRects(
    const gfx::Rect& view_screen_rect,
    const gfx::Rect& window_screen_rect) {
  original_view_screen_rect_ = view_screen_rect;
  original_window_screen_rect_ = window_screen_rect;
  if (emulating_desktop()) {
    Apply();
  }
}

}  // namespace content