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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CC_QUADS_DRAW_POLYGON_H_
#define CC_QUADS_DRAW_POLYGON_H_
#include <vector>
#include "cc/base/math_util.h"
#include "cc/output/bsp_compare_result.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/vector3d_f.h"
#include "ui/gfx/transform.h"
namespace cc {
class DrawQuad;
class CC_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);
// Split takes this DrawPolygon and splits it into two pieces that are on
// either side of |splitter|. Any edges of this polygon that cross the plane
// of |splitter| will have an intersection point that is shared by both
// polygons on either side.
// Split will only return true if it determines that we got back 2
// intersection points. Only when it returns true will front and back both be
// valid new polygons that are on opposite sides of the splitting plane.
bool Split(const DrawPolygon& splitter,
scoped_ptr<DrawPolygon>* front,
scoped_ptr<DrawPolygon>* back);
float SignedPointDistance(const gfx::Point3F& point) const;
// Checks polygon a against polygon b and returns which side it lies on, or
// whether it crosses (necessitating a split in the BSP tree).
static BspCompareResult SideCompare(const DrawPolygon& a,
const DrawPolygon& b);
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_; }
scoped_ptr<DrawPolygon> CreateCopy();
void RecomputeNormalForTesting();
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.
const DrawQuad* original_ref_;
bool is_split_;
};
} // namespace cc
#endif // CC_QUADS_DRAW_POLYGON_H_
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