Home | History | Annotate | Download | only in quads 
      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 CC_QUADS_DRAW_POLYGON_H_
      6 #define CC_QUADS_DRAW_POLYGON_H_
      7 
      8 #include <vector>
      9 
     10 #include "cc/base/math_util.h"
     11 #include "cc/output/bsp_compare_result.h"
     12 #include "ui/gfx/point3_f.h"
     13 #include "ui/gfx/quad_f.h"
     14 #include "ui/gfx/rect_f.h"
     15 #include "ui/gfx/transform.h"
     16 #include "ui/gfx/vector3d_f.h"
     17 
     18 namespace cc {
     19 
     20 class DrawQuad;
     21 
     22 class CC_EXPORT DrawPolygon {
     23  public:
     24   DrawPolygon();
     25   ~DrawPolygon();
     26 
     27   DrawPolygon(DrawQuad* original_ref,
     28               const std::vector<gfx::Point3F>& in_points,
     29               const gfx::Vector3dF& normal,
     30               int draw_order_index = 0);
     31   DrawPolygon(DrawQuad* original_ref,
     32               const gfx::RectF& visible_content_rect,
     33               const gfx::Transform& transform,
     34               int draw_order_index = 0);
     35 
     36   // Split takes this DrawPolygon and splits it into two pieces that are on
     37   // either side of |splitter|. Any edges of this polygon that cross the plane
     38   // of |splitter| will have an intersection point that is shared by both
     39   // polygons on either side.
     40   // Split will only return true if it determines that we got back 2
     41   // intersection points. Only when it returns true will front and back both be
     42   // valid new polygons that are on opposite sides of the splitting plane.
     43   bool Split(const DrawPolygon& splitter,
     44              scoped_ptr<DrawPolygon>* front,
     45              scoped_ptr<DrawPolygon>* back);
     46   float SignedPointDistance(const gfx::Point3F& point) const;
     47   // Checks polygon a against polygon b and returns which side it lies on, or
     48   // whether it crosses (necessitating a split in the BSP tree).
     49   static BspCompareResult SideCompare(const DrawPolygon& a,
     50                                       const DrawPolygon& b);
     51   void ToQuads2D(std::vector<gfx::QuadF>* quads) const;
     52   void TransformToScreenSpace(const gfx::Transform& transform);
     53   void TransformToLayerSpace(const gfx::Transform& inverse_transform);
     54 
     55   const std::vector<gfx::Point3F>& points() const { return points_; }
     56   const gfx::Vector3dF& normal() const { return normal_; }
     57   const DrawQuad* original_ref() const { return original_ref_; }
     58   int order_index() const { return order_index_; }
     59 
     60   scoped_ptr<DrawPolygon> CreateCopy();
     61 
     62   static gfx::Vector3dF default_normal;
     63 
     64  private:
     65   void ApplyTransform(const gfx::Transform& transform);
     66   void ApplyTransformToNormal(const gfx::Transform& transform);
     67 
     68   std::vector<gfx::Point3F> points_;
     69   // Normalized, necessitated by distance calculations and tests of coplanarity.
     70   gfx::Vector3dF normal_;
     71   // This is an index that can be used to test whether a quad comes before or
     72   // after another in document order, useful for tie-breaking when it comes
     73   // to coplanar surfaces.
     74   int order_index_;
     75   // The pointer to the original quad, which gives us all the drawing info
     76   // we need.
     77   // This DrawQuad is owned by the caller and its lifetime must be preserved
     78   // as long as this DrawPolygon is alive.
     79   DrawQuad* original_ref_;
     80 };
     81 
     82 }  // namespace cc
     83 
     84 #endif  // CC_QUADS_DRAW_POLYGON_H_
     85