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// Copyright 2012 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/display/overscan_calibrator.h"
#include <stdint.h>
#include <limits>
#include <memory>
#include "ash/display/window_tree_host_manager.h"
#include "ash/public/cpp/shell_window_ids.h"
#include "ash/shell.h"
#include "third_party/skia/include/core/SkColor.h"
#include "third_party/skia/include/core/SkPaint.h"
#include "third_party/skia/include/core/SkPath.h"
#include "ui/aura/window.h"
#include "ui/compositor/layer.h"
#include "ui/compositor/paint_recorder.h"
#include "ui/display/manager/display_manager.h"
#include "ui/display/manager/managed_display_info.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/geometry/skia_conversions.h"
namespace ash {
namespace {
// The opacity for the arrows of the overscan calibration.
const float kArrowOpacity = 0.8;
// The height in pixel for the arrows to show the overscan calibration.
const int kCalibrationArrowHeight = 70;
// The gap between the boundary and calibration arrows.
const int kArrowGapWidth = 0;
// Draw the arrow for the overscan calibration to |canvas|.
void DrawTriangle(int x_offset,
int y_offset,
double rotation_degree,
gfx::Canvas* canvas) {
// Draw triangular arrows.
cc::PaintFlags content_flags;
content_flags.setStyle(cc::PaintFlags::kFill_Style);
content_flags.setColor(SkColorSetA(
SK_ColorBLACK, std::numeric_limits<uint8_t>::max() * kArrowOpacity));
cc::PaintFlags border_flags;
border_flags.setStyle(cc::PaintFlags::kStroke_Style);
border_flags.setColor(SkColorSetA(
SK_ColorWHITE, std::numeric_limits<uint8_t>::max() * kArrowOpacity));
SkPath base_path;
base_path.moveTo(0, 0);
base_path.lineTo(SkIntToScalar(-kCalibrationArrowHeight),
SkIntToScalar(-kCalibrationArrowHeight));
base_path.lineTo(SkIntToScalar(kCalibrationArrowHeight),
SkIntToScalar(-kCalibrationArrowHeight));
base_path.close();
SkPath path;
gfx::Transform rotate_transform;
rotate_transform.Rotate(rotation_degree);
gfx::Transform move_transform;
move_transform.Translate(x_offset, y_offset);
rotate_transform.PostConcat(move_transform);
base_path.transform(gfx::TransformToFlattenedSkMatrix(rotate_transform),
&path);
canvas->DrawPath(path, content_flags);
canvas->DrawPath(path, border_flags);
}
gfx::Insets RotateInsets(display::Display::Rotation rotation,
gfx::Insets&& insets) {
switch (rotation) {
case display::Display::ROTATE_0:
return insets;
case display::Display::ROTATE_90:
return gfx::Insets::TLBR(insets.right(), insets.top(), insets.left(),
insets.bottom());
case display::Display::ROTATE_180:
return gfx::Insets::TLBR(insets.bottom(), insets.right(), insets.top(),
insets.left());
case display::Display::ROTATE_270:
return gfx::Insets::TLBR(insets.left(), insets.bottom(), insets.right(),
insets.top());
}
NOTREACHED();
}
gfx::Insets ConvertToDisplay(const display::Display& display,
const gfx::Insets& insets) {
display::ManagedDisplayInfo info =
ash::Shell::Get()->display_manager()->GetDisplayInfo(display.id());
return RotateInsets(
display.rotation(),
gfx::ScaleToFlooredInsets(
insets, info.device_scale_factor() / display.device_scale_factor()));
}
gfx::Insets ConvertToHost(const display::Display& display,
const gfx::Insets& insets) {
display::ManagedDisplayInfo info =
ash::Shell::Get()->display_manager()->GetDisplayInfo(display.id());
display::Display::Rotation inverted_rotation =
static_cast<display::Display::Rotation>(
(4 - static_cast<int>(display.rotation())) % 4);
return RotateInsets(
inverted_rotation,
gfx::ScaleToFlooredInsets(
insets, display.device_scale_factor() / info.device_scale_factor()));
}
} // namespace
OverscanCalibrator::OverscanCalibrator(const display::Display& target_display,
const gfx::Insets& initial_insets)
: display_(target_display),
insets_(ConvertToDisplay(display_, initial_insets)),
initial_insets_(initial_insets),
committed_(false) {
// Undo the overscan calibration temporarily so that the user can see
// dark boundary and current overscan region.
Shell::Get()->display_manager()->SetOverscanInsets(display_.id(),
gfx::Insets());
UpdateUILayer();
}
OverscanCalibrator::~OverscanCalibrator() {
// Overscan calibration has finished without commit, so the display has to
// be the original offset.
if (!committed_) {
Shell::Get()->display_manager()->SetOverscanInsets(display_.id(),
initial_insets_);
}
}
void OverscanCalibrator::Commit() {
Shell::Get()->display_manager()->SetOverscanInsets(
display_.id(), ConvertToHost(display_, insets_));
committed_ = true;
}
void OverscanCalibrator::Reset() {
insets_ = ConvertToDisplay(display_, initial_insets_);
calibration_layer_->SchedulePaint(calibration_layer_->bounds());
}
void OverscanCalibrator::UpdateInsets(const gfx::Insets& insets) {
insets_ = gfx::Insets::TLBR(
std::max(insets.top(), 0), std::max(insets.left(), 0),
std::max(insets.bottom(), 0), std::max(insets.right(), 0));
calibration_layer_->SchedulePaint(calibration_layer_->bounds());
}
void OverscanCalibrator::OnPaintLayer(const ui::PaintContext& context) {
ui::PaintRecorder recorder(context, calibration_layer_->size());
gfx::Rect full_bounds = calibration_layer_->bounds();
gfx::Rect inner_bounds = full_bounds;
inner_bounds.Inset(insets_);
recorder.canvas()->FillRect(full_bounds, SK_ColorBLACK);
recorder.canvas()->FillRect(inner_bounds, SK_ColorTRANSPARENT,
SkBlendMode::kClear);
gfx::Point center = inner_bounds.CenterPoint();
int vertical_offset = inner_bounds.height() / 2 - kArrowGapWidth;
int horizontal_offset = inner_bounds.width() / 2 - kArrowGapWidth;
gfx::Canvas* canvas = recorder.canvas();
DrawTriangle(center.x(), center.y() + vertical_offset, 0, canvas);
DrawTriangle(center.x(), center.y() - vertical_offset, 180, canvas);
DrawTriangle(center.x() - horizontal_offset, center.y(), 90, canvas);
DrawTriangle(center.x() + horizontal_offset, center.y(), -90, canvas);
}
void OverscanCalibrator::OnDeviceScaleFactorChanged(
float old_device_scale_factor,
float new_device_scale_factor) {}
void OverscanCalibrator::OnDisplayMetricsChanged(
const display::Display& display,
uint32_t changed_metrics) {
if (display_.id() != display.id() || committed_)
return;
display_ = display;
UpdateUILayer();
Reset();
}
void OverscanCalibrator::UpdateUILayer() {
display::ManagedDisplayInfo info =
Shell::Get()->display_manager()->GetDisplayInfo(display_.id());
aura::Window* root = Shell::GetRootWindowForDisplayId(display_.id());
ui::Layer* parent_layer =
Shell::GetContainer(root, kShellWindowId_OverlayContainer)->layer();
calibration_layer_ = std::make_unique<ui::Layer>();
calibration_layer_->SetOpacity(0.5f);
calibration_layer_->SetBounds(parent_layer->bounds());
calibration_layer_->set_delegate(this);
parent_layer->Add(calibration_layer_.get());
}
} // namespace ash
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