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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_VIZ_SERVICE_DISPLAY_DRAW_POLYGON_H_
#define COMPONENTS_VIZ_SERVICE_DISPLAY_DRAW_POLYGON_H_
#include <memory>
#include <vector>
#include "base/memory/raw_ptr.h"
#include "components/viz/service/viz_service_export.h"
#include "ui/gfx/geometry/point3_f.h"
#include "ui/gfx/geometry/quad_f.h"
#include "ui/gfx/geometry/rect_f.h"
#include "ui/gfx/geometry/transform.h"
#include "ui/gfx/geometry/vector3d_f.h"
namespace viz {
class DrawQuad;
class VIZ_SERVICE_EXPORT DrawPolygon {
public:
DrawPolygon();
~DrawPolygon();
DrawPolygon(const DrawQuad* original_ref,
const std::vector<gfx::Point3F>& in_points,
const gfx::Vector3dF& normal,
int draw_order_index = 0);
DrawPolygon(const DrawQuad* original_ref,
const gfx::RectF& visible_layer_rect,
const gfx::Transform& transform,
int draw_order_index = 0);
void SplitPolygon(std::unique_ptr<DrawPolygon> polygon,
std::unique_ptr<DrawPolygon>* front,
std::unique_ptr<DrawPolygon>* back,
bool* is_coplanar) const;
float SignedPointDistance(const gfx::Point3F& point) const;
void ToQuads2D(std::vector<gfx::QuadF>* quads) const;
void TransformToScreenSpace(const gfx::Transform& transform);
void TransformToLayerSpace(const gfx::Transform& inverse_transform);
const std::vector<gfx::Point3F>& points() const { return points_; }
const gfx::Vector3dF& normal() const { return normal_; }
const DrawQuad* original_ref() const { return original_ref_; }
int order_index() const { return order_index_; }
bool is_split() const { return is_split_; }
std::unique_ptr<DrawPolygon> CreateCopy();
// These are helper functions for testing.
void RecomputeNormalForTesting();
friend bool IsPlanarForTesting(const DrawPolygon& p);
friend bool IsConvexForTesting(const DrawPolygon& p);
private:
void ApplyTransform(const gfx::Transform& transform);
void ApplyTransformToNormal(const gfx::Transform& transform);
void ConstructNormal();
std::vector<gfx::Point3F> points_;
// Normalized, necessitated by distance calculations and tests of coplanarity.
gfx::Vector3dF normal_;
// This is an index that can be used to test whether a quad comes before or
// after another in document order, useful for tie-breaking when it comes
// to coplanar surfaces.
int order_index_;
// The pointer to the original quad, which gives us all the drawing info
// we need.
// This DrawQuad is owned by the caller and its lifetime must be preserved
// as long as this DrawPolygon is alive.
raw_ptr<const DrawQuad> original_ref_;
bool is_split_;
};
} // namespace viz
#endif // COMPONENTS_VIZ_SERVICE_DISPLAY_DRAW_POLYGON_H_
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