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// Copyright 2023 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/rounded_display/rounded_display_gutter.h"
#include <algorithm>
#include <memory>
#include <utility>
#include <vector>
#include "ash/frame_sink/ui_resource.h"
#include "cc/paint/paint_flags.h"
#include "third_party/skia/include/core/SkColor.h"
#include "third_party/skia/include/core/SkPath.h"
#include "third_party/skia/include/core/SkScalar.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/geometry/vector2d.h"
namespace ash {
namespace {
using RoundedCornerPosition = RoundedDisplayGutter::RoundedCorner::Position;
using RoundedCorner = RoundedDisplayGutter::RoundedCorner;
} // namespace
RoundedCorner::RoundedCorner(Position position,
int radius,
const gfx::Point& origin)
: position_(position),
radius_(radius),
bounds_in_pixels_(gfx::Rect(origin, gfx::Size(radius, radius))) {}
RoundedCorner& RoundedCorner::operator=(RoundedCorner&& other) = default;
RoundedCorner::RoundedCorner(RoundedCorner&& other) = default;
RoundedCorner::~RoundedCorner() = default;
bool RoundedDisplayGutter::RoundedCorner::DoesPaint() const {
return radius_ > 0;
}
void RoundedDisplayGutter::RoundedCorner::Paint(gfx::Canvas* canvas) const {
if (!DoesPaint()) {
return;
}
PaintCornerHelper(canvas);
}
void RoundedDisplayGutter::RoundedCorner::PaintCornerHelper(
gfx::Canvas* canvas) const {
SkPath path;
SkScalar startAngle = 0.0, sweepAngle = 0.0;
SkScalar dx = 0.0, dy = 0.0;
int translate_dx = 0.0, translate_dy = 0.0;
switch (position_) {
case RoundedCornerPosition::kUpperLeft:
startAngle = -90;
sweepAngle = -90;
dx = radius_;
dy = -radius_;
translate_dx = 0;
translate_dy = 0;
break;
case RoundedCornerPosition::kLowerLeft:
startAngle = 90;
sweepAngle = 90;
dx = radius_;
dy = radius_;
translate_dx = 0;
translate_dy = -radius_;
break;
case RoundedCornerPosition::kUpperRight:
startAngle = 0;
sweepAngle = -90;
dx = radius_;
dy = radius_;
translate_dx = -radius_;
translate_dy = 0;
break;
case RoundedCornerPosition::kLowerRight:
startAngle = 0;
sweepAngle = 90;
dx = radius_;
dy = -radius_;
translate_dx = -radius_;
translate_dy = -radius_;
break;
}
const SkScalar oval_radius = radius_ * 2;
SkRect oval{0, 0, oval_radius, oval_radius};
path.addArc(oval, startAngle, sweepAngle);
if (position_ == RoundedCornerPosition::kUpperLeft ||
position_ == RoundedCornerPosition::kLowerLeft) {
path.rLineTo(0, dy);
path.rLineTo(dx, 0);
}
if (position_ == RoundedCornerPosition::kUpperRight ||
position_ == RoundedCornerPosition::kLowerRight) {
path.rLineTo(dx, 0);
path.rLineTo(0, dy);
}
cc::PaintFlags flags;
flags.setStyle(cc::PaintFlags::Style::kFill_Style);
flags.setAntiAlias(true);
flags.setColor(SK_ColorBLACK);
canvas->Save();
canvas->Translate({translate_dx, translate_dy});
canvas->DrawPath(path, flags);
canvas->Restore();
}
// -----------------------------------------------------------------------------
// RoundedDisplayGutter:
// static
std::unique_ptr<RoundedDisplayGutter> RoundedDisplayGutter::CreateGutter(
std::vector<RoundedCorner>&& corners,
bool is_overlay) {
return std::make_unique<RoundedDisplayGutter>(std::move(corners), is_overlay);
}
RoundedDisplayGutter::RoundedDisplayGutter(std::vector<RoundedCorner>&& corners,
bool is_overlay)
: corners_(std::move(corners)), is_overlay_(is_overlay) {
// A gutter must paint at least one rounded corner and at most four corners.
DCHECK(corners_.size() > 0 && corners_.size() <= 4);
// Since the corners of the gutter cannot be changed, both gutter bounds and
// ui_source_id do not change either.
bounds_in_pixels_ = CalculateGutterBounds();
ui_source_id_ = CalculateUiSourceId();
DCHECK(ui_source_id_ != kInvalidUiSourceId);
}
RoundedDisplayGutter::~RoundedDisplayGutter() = default;
UiSourceId RoundedDisplayGutter::ui_source_id() const {
return ui_source_id_;
}
UiSourceId RoundedDisplayGutter::CalculateUiSourceId() const {
UiSourceId ui_source_id = kInvalidUiSourceId;
// Value of the position mask of the gutter will give a unique value for any
// combination of RoundedDisplayCorners.
for (const auto& corner : corners_) {
ui_source_id |= corner.position();
}
return ui_source_id;
}
gfx::Rect RoundedDisplayGutter::CalculateGutterBounds() const {
gfx::Rect gutter_bounds;
for (const auto& corner : corners_) {
gutter_bounds.Union(corner.bounds());
}
return gutter_bounds;
}
const gfx::Rect& RoundedDisplayGutter::bounds() const {
return bounds_in_pixels_;
}
void RoundedDisplayGutter::Paint(gfx::Canvas* canvas) const {
for (const auto& corner : corners_) {
canvas->Save();
const gfx::Vector2d offset =
corner.bounds().OffsetFromOrigin() - bounds().OffsetFromOrigin();
canvas->Translate(offset);
corner.Paint(canvas);
canvas->Restore();
}
}
} // namespace ash
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