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cursor_window_controller.cc
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cursor_window_controller.cc
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// Copyright 2014 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 "ash/display/cursor_window_controller.h"
#include "ash/components/cursor/cursor_view.h"
#include "ash/display/display_color_manager.h"
#include "ash/display/mirror_window_controller.h"
#include "ash/display/window_tree_host_manager.h"
#include "ash/magnifier/magnification_controller.h"
#include "ash/public/cpp/ash_constants.h"
#include "ash/public/cpp/ash_pref_names.h"
#include "ash/public/cpp/ash_switches.h"
#include "ash/public/cpp/shell_window_ids.h"
#include "ash/root_window_controller.h"
#include "ash/session/session_controller_impl.h"
#include "ash/shell.h"
#include "ash/window_factory.h"
#include "base/command_line.h"
#include "base/metrics/histogram_macros.h"
#include "components/prefs/pref_service.h"
#include "ui/aura/env.h"
#include "ui/aura/window_delegate.h"
#include "ui/aura/window_event_dispatcher.h"
#include "ui/base/cursor/cursors_aura.h"
#include "ui/base/hit_test.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/compositor/dip_util.h"
#include "ui/compositor/paint_recorder.h"
#include "ui/display/display.h"
#include "ui/display/manager/display_manager.h"
#include "ui/display/screen.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/geometry/dip_util.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/image/image_skia_operations.h"
#include "ui/views/widget/widget.h"
namespace ash {
namespace {
const int kMinLargeCursorSize = 25;
const int kMaxLargeCursorSize = 64;
} // namespace
class CursorWindowDelegate : public aura::WindowDelegate {
public:
CursorWindowDelegate() = default;
~CursorWindowDelegate() override = default;
// aura::WindowDelegate overrides:
gfx::Size GetMinimumSize() const override { return size_; }
gfx::Size GetMaximumSize() const override { return size_; }
void OnBoundsChanged(const gfx::Rect& old_bounds,
const gfx::Rect& new_bounds) override {}
gfx::NativeCursor GetCursor(const gfx::Point& point) override {
return gfx::kNullCursor;
}
int GetNonClientComponent(const gfx::Point& point) const override {
return HTNOWHERE;
}
bool ShouldDescendIntoChildForEventHandling(
aura::Window* child,
const gfx::Point& location) override {
return false;
}
bool CanFocus() override { return false; }
void OnCaptureLost() override {}
void OnPaint(const ui::PaintContext& context) override {
// No need to cache the output here, the CursorWindow is not invalidated.
ui::PaintRecorder recorder(context, size_);
recorder.canvas()->DrawImageInt(cursor_image_, 0, 0);
}
void OnDeviceScaleFactorChanged(float old_device_scale_factor,
float new_device_scale_factor) override {}
void OnWindowDestroying(aura::Window* window) override {}
void OnWindowDestroyed(aura::Window* window) override {}
void OnWindowTargetVisibilityChanged(bool visible) override {}
bool HasHitTestMask() const override { return false; }
void GetHitTestMask(SkPath* mask) const override {}
// Sets the cursor image for the |display|'s scale factor.
void SetCursorImage(const gfx::Size& size, const gfx::ImageSkia& image) {
size_ = size;
cursor_image_ = image;
}
const gfx::Size& size() const { return size_; }
const gfx::ImageSkia& cursor_image() const { return cursor_image_; }
private:
gfx::ImageSkia cursor_image_;
gfx::Size size_;
DISALLOW_COPY_AND_ASSIGN(CursorWindowDelegate);
};
CursorWindowController::CursorWindowController()
: delegate_(new CursorWindowDelegate()),
is_cursor_motion_blur_enabled_(
base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kAshEnableCursorMotionBlur)) {}
CursorWindowController::~CursorWindowController() {
SetContainer(NULL);
}
void CursorWindowController::SetLargeCursorSizeInDip(
int large_cursor_size_in_dip) {
large_cursor_size_in_dip =
std::min(large_cursor_size_in_dip, kMaxLargeCursorSize);
large_cursor_size_in_dip =
std::max(large_cursor_size_in_dip, kMinLargeCursorSize);
if (large_cursor_size_in_dip_ == large_cursor_size_in_dip)
return;
large_cursor_size_in_dip_ = large_cursor_size_in_dip;
if (display_.is_valid())
UpdateCursorImage();
}
bool CursorWindowController::ShouldEnableCursorCompositing() {
if (is_cursor_motion_blur_enabled_)
return true;
// During startup, we may not have a preference service yet. We need to check
// display manager state first so that we don't accidentally ignore it while
// early outing when there isn't a PrefService yet.
Shell* shell = Shell::Get();
display::DisplayManager* display_manager = shell->display_manager();
if ((display_manager->IsInSoftwareMirrorMode()) ||
display_manager->IsInUnifiedMode() ||
display_manager->screen_capture_is_active()) {
return true;
}
if (shell->magnification_controller()->IsEnabled())
return true;
PrefService* prefs = shell->session_controller()->GetActivePrefService();
if (!prefs) {
// The active pref service can be null early in startup.
return false;
}
if (prefs->GetBoolean(prefs::kNightLightEnabled)) {
// All or some displays don't support setting a CRTC matrix, which means
// Night Light is using the composited color matrix, and hence software
// cursor should be used.
// TODO(afakhry): Instead of switching to the composited cursor on all
// displays if any of them don't support a CRTC matrix, we should provide
// the functionality to turn on the composited cursor on a per-display basis
// (i.e. use it only on the displays that don't support CRTC matrices).
const DisplayColorManager::DisplayCtmSupport displays_ctm_support =
shell->display_color_manager()->displays_ctm_support();
UMA_HISTOGRAM_ENUMERATION("Ash.NightLight.DisplayCrtcCtmSupport",
displays_ctm_support);
if (displays_ctm_support != DisplayColorManager::DisplayCtmSupport::kAll)
return true;
}
return prefs->GetBoolean(prefs::kAccessibilityLargeCursorEnabled) ||
prefs->GetBoolean(prefs::kAccessibilityHighContrastEnabled) ||
prefs->GetBoolean(prefs::kDockedMagnifierEnabled);
}
void CursorWindowController::SetCursorCompositingEnabled(bool enabled) {
if (is_cursor_compositing_enabled_ != enabled) {
is_cursor_compositing_enabled_ = enabled;
if (display_.is_valid())
UpdateCursorImage();
UpdateContainer();
}
}
void CursorWindowController::UpdateContainer() {
if (is_cursor_compositing_enabled_) {
display::Screen* screen = display::Screen::GetScreen();
display::Display display =
screen->GetDisplayNearestPoint(screen->GetCursorScreenPoint());
DCHECK(display.is_valid());
if (display.is_valid())
SetDisplay(display);
} else {
SetContainer(nullptr);
}
// Updates the hot point based on the current display.
UpdateCursorImage();
}
void CursorWindowController::SetDisplay(const display::Display& display) {
if (!is_cursor_compositing_enabled_)
return;
// TODO(oshima): Do not update the composition cursor when crossing
// display in unified desktop mode for now. crbug.com/517222.
if (Shell::Get()->display_manager()->IsInUnifiedMode() &&
display.id() != display::kUnifiedDisplayId) {
return;
}
display_ = display;
aura::Window* root_window = Shell::GetRootWindowForDisplayId(display.id());
if (!root_window)
return;
SetContainer(RootWindowController::ForWindow(root_window)
->GetContainer(kShellWindowId_MouseCursorContainer));
SetBoundsInScreenAndRotation(display.bounds(), display.rotation());
// Updates the hot point based on the current display.
UpdateCursorImage();
}
void CursorWindowController::UpdateLocation() {
if (!cursor_window_)
return;
gfx::Point point = aura::Env::GetInstance()->last_mouse_location();
point.Offset(-bounds_in_screen_.x(), -bounds_in_screen_.y());
point.Offset(-hot_point_.x(), -hot_point_.y());
gfx::Rect bounds = cursor_window_->bounds();
bounds.set_origin(point);
cursor_window_->SetBounds(bounds);
}
void CursorWindowController::SetCursor(gfx::NativeCursor cursor) {
if (cursor_ == cursor)
return;
cursor_ = cursor;
UpdateCursorImage();
UpdateCursorVisibility();
}
void CursorWindowController::SetCursorSize(ui::CursorSize cursor_size) {
cursor_size_ = cursor_size;
UpdateCursorImage();
}
void CursorWindowController::SetVisibility(bool visible) {
visible_ = visible;
UpdateCursorVisibility();
}
void CursorWindowController::SetContainer(aura::Window* container) {
if (container_ == container)
return;
container_ = container;
if (!container) {
cursor_window_.reset();
cursor_view_.reset();
return;
}
bounds_in_screen_ = display_.bounds();
rotation_ = display_.rotation();
if (is_cursor_motion_blur_enabled_) {
UpdateCursorView();
} else {
// Reusing the window does not work when the display is disconnected.
// Just creates a new one instead. crbug.com/384218.
cursor_window_ = window_factory::NewWindow(delegate_.get());
cursor_window_->SetTransparent(true);
cursor_window_->Init(ui::LAYER_TEXTURED);
cursor_window_->SetEventTargetingPolicy(aura::EventTargetingPolicy::kNone);
cursor_window_->set_owned_by_parent(false);
// Call UpdateCursorImage() to figure out |cursor_window_|'s desired size.
UpdateCursorImage();
container->AddChild(cursor_window_.get());
}
UpdateCursorVisibility();
UpdateLocation();
}
void CursorWindowController::SetBoundsInScreenAndRotation(
const gfx::Rect& bounds,
display::Display::Rotation rotation) {
if (bounds == bounds_in_screen_ && rotation == rotation_)
return;
bounds_in_screen_ = bounds;
rotation_ = rotation;
if (cursor_view_)
UpdateCursorView();
UpdateLocation();
}
void CursorWindowController::UpdateCursorImage() {
if (!is_cursor_compositing_enabled_)
return;
// Use the original device scale factor instead of the display's, which
// might have been adjusted for the UI scale.
const float original_scale = Shell::Get()
->display_manager()
->GetDisplayInfo(display_.id())
.device_scale_factor();
// And use the nearest resource scale factor.
float cursor_scale =
ui::GetScaleForScaleFactor(ui::GetSupportedScaleFactor(original_scale));
gfx::ImageSkia image;
if (cursor_.native_type() == ui::CursorType::kCustom) {
SkBitmap bitmap = cursor_.GetBitmap();
if (bitmap.isNull())
return;
image = gfx::ImageSkia::CreateFrom1xBitmap(bitmap);
hot_point_ = cursor_.GetHotspot();
} else {
int resource_id;
if (!ui::GetCursorDataFor(cursor_size_, cursor_.native_type(), cursor_scale,
&resource_id, &hot_point_)) {
return;
}
image =
*ui::ResourceBundle::GetSharedInstance().GetImageSkiaNamed(resource_id);
}
gfx::ImageSkia resized = image;
// Rescale cursor size. This is used with the combination of accessibility
// large cursor. We don't need to care about the case where cursor
// compositing is disabled as we always use cursor compositing if
// accessibility large cursor is enabled.
if (cursor_size_ == ui::CursorSize::kLarge &&
large_cursor_size_in_dip_ != image.size().width()) {
float rescale = static_cast<float>(large_cursor_size_in_dip_) /
static_cast<float>(image.size().width());
resized = gfx::ImageSkiaOperations::CreateResizedImage(
image, skia::ImageOperations::ResizeMethod::RESIZE_GOOD,
gfx::ScaleToCeiledSize(image.size(), rescale));
hot_point_ = gfx::ScaleToCeiledPoint(hot_point_, rescale);
}
const gfx::ImageSkiaRep& image_rep = resized.GetRepresentation(cursor_scale);
delegate_->SetCursorImage(
resized.size(),
gfx::ImageSkia(gfx::ImageSkiaRep(image_rep.GetBitmap(), cursor_scale)));
hot_point_ = gfx::ConvertPointToDIP(cursor_scale, hot_point_);
if (cursor_view_) {
cursor_view_->SetCursorImage(delegate_->cursor_image(), delegate_->size(),
hot_point_);
}
if (cursor_window_) {
cursor_window_->SetBounds(gfx::Rect(delegate_->size()));
cursor_window_->SchedulePaintInRect(
gfx::Rect(cursor_window_->bounds().size()));
}
UpdateLocation();
}
void CursorWindowController::UpdateCursorVisibility() {
bool visible = (visible_ && cursor_.native_type() != ui::CursorType::kNone);
if (visible) {
if (cursor_view_)
cursor_view_->GetWidget()->Show();
if (cursor_window_)
cursor_window_->Show();
} else {
if (cursor_view_)
cursor_view_->GetWidget()->Hide();
if (cursor_window_)
cursor_window_->Hide();
}
}
void CursorWindowController::UpdateCursorView() {
cursor_view_.reset(new cursor::CursorView(
container_, aura::Env::GetInstance()->last_mouse_location(),
is_cursor_motion_blur_enabled_));
UpdateCursorImage();
}
const gfx::ImageSkia& CursorWindowController::GetCursorImageForTest() const {
return delegate_->cursor_image();
}
} // namespace ash