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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 #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& in_points, const gfx::Vector3dF& normal, int draw_order_index = 0); DrawPolygon(const DrawQuad* original_ref, const gfx::RectF& visible_content_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* front, scoped_ptr* 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* quads) const; void TransformToScreenSpace(const gfx::Transform& transform); void TransformToLayerSpace(const gfx::Transform& inverse_transform); const std::vector& 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 CreateCopy(); private: void ApplyTransform(const gfx::Transform& transform); void ApplyTransformToNormal(const gfx::Transform& transform); std::vector 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_