1 // Copyright 2014 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef COMPONENTS_VIZ_SERVICE_DISPLAY_DRAW_POLYGON_H_ 6 #define COMPONENTS_VIZ_SERVICE_DISPLAY_DRAW_POLYGON_H_ 7 8 #include <memory> 9 #include <vector> 10 11 #include "components/viz/service/viz_service_export.h" 12 #include "ui/gfx/geometry/point3_f.h" 13 #include "ui/gfx/geometry/quad_f.h" 14 #include "ui/gfx/geometry/rect_f.h" 15 #include "ui/gfx/geometry/vector3d_f.h" 16 #include "ui/gfx/transform.h" 17 18 namespace viz { 19 class DrawQuad; 20 21 class VIZ_SERVICE_EXPORT DrawPolygon { 22 public: 23 DrawPolygon(); 24 ~DrawPolygon(); 25 26 DrawPolygon(const DrawQuad* original_ref, 27 const std::vector<gfx::Point3F>& in_points, 28 const gfx::Vector3dF& normal, 29 int draw_order_index = 0); 30 DrawPolygon(const DrawQuad* original_ref, 31 const gfx::RectF& visible_layer_rect, 32 const gfx::Transform& transform, 33 int draw_order_index = 0); 34 35 // Split takes this DrawPolygon and splits it into two pieces that are on 36 // either side of |splitter|. Any edges of this polygon that cross the plane 37 // of |splitter| will have an intersection point that is shared by both 38 // polygons on either side. 39 // Split will only return true if it determines that we got back 2 40 // intersection points. Only when it returns true will front and back both be 41 // valid new polygons that are on opposite sides of the splitting plane. 42 void SplitPolygon(std::unique_ptr<DrawPolygon> polygon, 43 std::unique_ptr<DrawPolygon>* front, 44 std::unique_ptr<DrawPolygon>* back, 45 bool* is_coplanar) const; 46 float SignedPointDistance(const gfx::Point3F& point) const; 47 void ToQuads2D(std::vector<gfx::QuadF>* quads) const; 48 void TransformToScreenSpace(const gfx::Transform& transform); 49 void TransformToLayerSpace(const gfx::Transform& inverse_transform); 50 points()51 const std::vector<gfx::Point3F>& points() const { return points_; } normal()52 const gfx::Vector3dF& normal() const { return normal_; } original_ref()53 const DrawQuad* original_ref() const { return original_ref_; } order_index()54 int order_index() const { return order_index_; } is_split()55 bool is_split() const { return is_split_; } 56 std::unique_ptr<DrawPolygon> CreateCopy(); 57 58 // These are helper functions for testing. 59 void RecomputeNormalForTesting(); 60 friend bool IsPlanarForTesting(const DrawPolygon& p); 61 friend bool IsConvexForTesting(const DrawPolygon& p); 62 63 private: 64 void ApplyTransform(const gfx::Transform& transform); 65 void ApplyTransformToNormal(const gfx::Transform& transform); 66 67 void ConstructNormal(); 68 69 std::vector<gfx::Point3F> points_; 70 // Normalized, necessitated by distance calculations and tests of coplanarity. 71 gfx::Vector3dF normal_; 72 // This is an index that can be used to test whether a quad comes before or 73 // after another in document order, useful for tie-breaking when it comes 74 // to coplanar surfaces. 75 int order_index_; 76 // The pointer to the original quad, which gives us all the drawing info 77 // we need. 78 // This DrawQuad is owned by the caller and its lifetime must be preserved 79 // as long as this DrawPolygon is alive. 80 const DrawQuad* original_ref_; 81 bool is_split_; 82 }; 83 84 } // namespace viz 85 86 #endif // COMPONENTS_VIZ_SERVICE_DISPLAY_DRAW_POLYGON_H_ 87