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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_GFX_DELEGATED_INK_POINT_H_
#define UI_GFX_DELEGATED_INK_POINT_H_
#include <limits>
#include <optional>
#include <string>
#include "base/component_export.h"
#include "base/time/time.h"
#include "mojo/public/cpp/bindings/struct_traits.h"
#include "ui/gfx/geometry/point_f.h"
namespace gfx {
class DelegatedInkMetadata;
namespace mojom {
class DelegatedInkPointDataView;
} // namespace mojom
// This class stores the information required to draw a single point of a
// delegated ink trail. When the WebAPI |updateInkTrailStartPoint| is called,
// the renderer requests that the browser begin sending these to viz. Viz
// will collect them, and then during |DrawAndSwap| will use the
// DelegatedInkPoints that have arrived from the browser along with the
// DelegatedInkMetadata that the renderer sent to draw a delegated ink trail on
// the screen, connected to the end of the already rendered ink stroke.
//
// Explainer for the feature:
// https://github.com/WICG/ink-enhancement/blob/main/README.md
class COMPONENT_EXPORT(GFX) DelegatedInkPoint {
public:
DelegatedInkPoint() = default;
bool operator==(const DelegatedInkPoint& o) const = default;
DelegatedInkPoint(const PointF& pt,
base::TimeTicks timestamp,
int32_t pointer_id = std::numeric_limits<int32_t>::min())
: point_(pt), timestamp_(timestamp), pointer_id_(pointer_id) {}
const PointF& point() const { return point_; }
base::TimeTicks timestamp() const { return timestamp_; }
std::optional<base::TimeTicks> paint_timestamp() const {
return paint_timestamp_;
}
void set_paint_timestamp(base::TimeTicks ts) { paint_timestamp_ = ts; }
int32_t pointer_id() const { return pointer_id_; }
std::string ToString() const;
bool MatchesDelegatedInkMetadata(const DelegatedInkMetadata* metadata) const;
uint64_t trace_id() const {
// Use mask to distinguish from DelegatedInkMetadata::trace_id().
// Using microseconds provides uniqueness of trace_id per
// DelegatedInkPoint.
return timestamp_.since_origin().InMicroseconds() & 0x7fffffffffffffff;
}
private:
friend struct mojo::StructTraits<mojom::DelegatedInkPointDataView,
DelegatedInkPoint>;
// Location of the input event relative to the root window in device pixels.
// Scale is device scale factor at time of input.
PointF point_;
// Timestamp from the input event.
base::TimeTicks timestamp_;
// Timestamp from the the first time the point is painted.
std::optional<base::TimeTicks> paint_timestamp_;
// Pointer ID from the input event. Used to store all DelegatedInkPoints from
// the same source together in viz so that they are all candidates for a
// single delegated ink trail and DelegatedInkPoints from other sources are
// not.
int32_t pointer_id_;
};
} // namespace gfx
#endif // UI_GFX_DELEGATED_INK_POINT_H_
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