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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ash/fast_ink/cursor/cursor_view.h"
#include <memory>
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/task/single_thread_task_runner.h"
#include "cc/paint/paint_canvas.h"
#include "ui/aura/window.h"
#include "ui/aura/window_tree_host.h"
#include "ui/gfx/geometry/skia_conversions.h"
#include "ui/gfx/image/image_skia_rep_default.h"
namespace ash {
namespace {
// Amount of time without cursor movement before entering stationary state.
const int kStationaryDelayMs = 500;
} // namespace
////////////////////////////////////////////////////////////////////////////////
// CursorView, public:
CursorView::~CursorView() = default;
// static
views::UniqueWidgetPtr CursorView::Create(const gfx::Point& initial_location,
aura::Window* container) {
CursorView* cursor_view = new CursorView(initial_location);
auto widget = FastInkView::CreateWidgetWithContents(
base::WrapUnique(cursor_view), container);
// Initialize after FaskInkHost is set on `cursor_view` and it is attached to
// a widget. So that it could get `buffer_to_screen_transform_`.
cursor_view->Init();
return widget;
}
void CursorView::SetCursorImages(
const std::vector<gfx::ImageSkia>& cursor_images,
const gfx::Size& cursor_size,
const gfx::Point& cursor_hotspot) {
cursor_images_.clear();
for (const gfx::ImageSkia& cursor_image : cursor_images) {
// Scale cursor images to device scale factor.
cursor_images_.push_back(gfx::ImageSkia::CreateFrom1xBitmap(
cursor_image.GetRepresentation(device_scale_factor_).GetBitmap()));
}
cursor_size_ = cursor_size;
cursor_hotspot_ = cursor_hotspot;
UpdateAnimation();
UpdateCursor();
stationary_timer_->Reset();
}
void CursorView::SetLocation(const gfx::Point& location) {
if (location == cursor_location_) {
return;
}
stationary_timer_->Reset();
cursor_location_ = location;
UpdateCursor();
}
////////////////////////////////////////////////////////////////////////////////
// CursorView, private:
CursorView::CursorView(const gfx::Point& initial_location)
: cursor_location_(initial_location),
ui_task_runner_(base::SingleThreadTaskRunner::GetCurrentDefault()) {
stationary_timer_.emplace(
FROM_HERE, base::Milliseconds(kStationaryDelayMs),
base::BindRepeating(&CursorView::OnStationary,
weak_ptr_factory_.GetWeakPtr()));
}
void CursorView::Init() {
buffer_to_screen_transform_ =
host()->window_to_buffer_transform().GetCheckedInverse();
device_scale_factor_ =
GetWidget()->GetNativeView()->GetHost()->device_scale_factor();
}
void CursorView::UpdateAnimation() {
cursor_image_index_ = 0;
if (cursor_images_.size() <= 1) {
animated_cursor_timer_.Stop();
} else if (cursor_images_.size() > 1) {
animated_cursor_timer_.Start(
FROM_HERE, base::Milliseconds(16),
base::BindRepeating(&CursorView::AdvanceFrame,
weak_ptr_factory_.GetWeakPtr()));
}
}
void CursorView::AdvanceFrame() {
cursor_image_index_ = (cursor_image_index_ + 1) % cursor_images_.size();
Draw();
}
void CursorView::Draw() {
{
std::unique_ptr<FastInkHost::ScopedPaint> paint =
GetScopedPaint(damage_rect_);
cc::PaintCanvas* sk_canvas = paint->canvas().sk_canvas();
sk_canvas->translate(cursor_rect_.x(), cursor_rect_.y());
// Undo device scale factor on the canvas.
sk_canvas->scale(SkFloatToScalar(1 / device_scale_factor_));
if (!cursor_images_.empty()) {
paint->canvas().DrawImageInt(cursor_images_[cursor_image_index_], 0, 0);
}
}
// TODO(b/360768376): Disable overlay until we know why
// fast ink cursor glitches.
UpdateSurface(cursor_rect_, damage_rect_,
/*auto_refresh=*/false);
}
void CursorView::OnStationary() {
stationary_timer_->Stop();
Draw();
}
void CursorView::UpdateCursor() {
damage_rect_ = cursor_rect_;
cursor_rect_ = gfx::Rect(cursor_size_);
cursor_rect_.set_x(SkIntToScalar(cursor_location_.x() - cursor_hotspot_.x()));
cursor_rect_.set_y(SkIntToScalar(cursor_location_.y() - cursor_hotspot_.y()));
damage_rect_.Union(cursor_rect_);
// Grow `damage_rect_` on all sides by 1 pixel for the possible rounding
// errors after scaling cursor images to device scale factor.
damage_rect_.Outset(1);
Draw();
}
} // namespace ash
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