Flutter Impeller
impeller::RoundRectGeometry Class Referencefinal

#include <round_rect_geometry.h>

Inheritance diagram for impeller::RoundRectGeometry:
impeller::Geometry

Public Member Functions

 RoundRectGeometry (const Rect &bounds, const Size &radii)
 
 ~RoundRectGeometry ()=default
 
bool CoversArea (const Matrix &transform, const Rect &rect) const override
 Determines if this geometry, transformed by the given transform, will completely cover all surface area of the given rect. More...
 
bool IsAxisAlignedRect () const override
 
- Public Member Functions inherited from impeller::Geometry
virtual GeometryResult::Mode GetResultMode () const
 
virtual bool CanApplyMaskFilter () const
 

Additional Inherited Members

- Static Public Member Functions inherited from impeller::Geometry
static std::shared_ptr< GeometryMakeFillPath (const Path &path, std::optional< Rect > inner_rect=std::nullopt)
 
static std::shared_ptr< GeometryMakeStrokePath (const Path &path, Scalar stroke_width=0.0, Scalar miter_limit=4.0, Cap stroke_cap=Cap::kButt, Join stroke_join=Join::kMiter)
 
static std::shared_ptr< GeometryMakeCover ()
 
static std::shared_ptr< GeometryMakeRect (const Rect &rect)
 
static std::shared_ptr< GeometryMakeOval (const Rect &rect)
 
static std::shared_ptr< GeometryMakeLine (const Point &p0, const Point &p1, Scalar width, Cap cap)
 
static std::shared_ptr< GeometryMakeCircle (const Point &center, Scalar radius)
 
static std::shared_ptr< GeometryMakeStrokedCircle (const Point &center, Scalar radius, Scalar stroke_width)
 
static std::shared_ptr< GeometryMakeRoundRect (const Rect &rect, const Size &radii)
 
static std::shared_ptr< GeometryMakePointField (std::vector< Point > points, Scalar radius, bool round)
 
- Static Protected Member Functions inherited from impeller::Geometry
static GeometryResult ComputePositionGeometry (const ContentContext &renderer, const Tessellator::VertexGenerator &generator, const Entity &entity, RenderPass &pass)
 
static GeometryResult ComputePositionUVGeometry (const ContentContext &renderer, const Tessellator::VertexGenerator &generator, const Matrix &uv_transform, const Entity &entity, RenderPass &pass)
 

Detailed Description

Definition at line 16 of file round_rect_geometry.h.

Constructor & Destructor Documentation

◆ RoundRectGeometry()

impeller::RoundRectGeometry::RoundRectGeometry ( const Rect bounds,
const Size radii 
)
explicit

Definition at line 9 of file round_rect_geometry.cc.

10  : bounds_(bounds), radii_(radii) {}

◆ ~RoundRectGeometry()

impeller::RoundRectGeometry::~RoundRectGeometry ( )
default

Member Function Documentation

◆ CoversArea()

bool impeller::RoundRectGeometry::CoversArea ( const Matrix transform,
const Rect rect 
) const
overridevirtual

Determines if this geometry, transformed by the given transform, will completely cover all surface area of the given rect.

This is a conservative estimate useful for certain optimizations.

Returns
true if the transformed geometry is guaranteed to cover the given rect. May return false in many undetected cases where the transformed geometry does in fact cover the rect.

Reimplemented from impeller::Geometry.

Definition at line 46 of file round_rect_geometry.cc.

47  {
48  if (!transform.IsTranslationScaleOnly()) {
49  return false;
50  }
51  bool flat_on_tb = bounds_.GetWidth() > radii_.width * 2;
52  bool flat_on_lr = bounds_.GetHeight() > radii_.height * 2;
53  if (!flat_on_tb && !flat_on_lr) {
54  return false;
55  }
56  // We either transform the bounds and delta-transform the radii,
57  // or we compute the vertical and horizontal bounds and then
58  // transform each. Either way there are 2 transform operations.
59  // We could also get a weaker answer by computing just the
60  // "inner rect" and only doing a coverage analysis on that,
61  // but this process will produce more culling results.
62  if (flat_on_tb) {
63  Rect vertical_bounds = bounds_.Expand(Size{-radii_.width, 0});
64  Rect coverage = vertical_bounds.TransformBounds(transform);
65  if (coverage.Contains(rect)) {
66  return true;
67  }
68  }
69  if (flat_on_lr) {
70  Rect horizontal_bounds = bounds_.Expand(Size{0, -radii_.height});
71  Rect coverage = horizontal_bounds.TransformBounds(transform);
72  if (coverage.Contains(rect)) {
73  return true;
74  }
75  }
76  return false;
77 }

References impeller::TRect< T >::Contains(), impeller::TRect< T >::Expand(), impeller::TRect< T >::GetHeight(), impeller::TRect< T >::GetWidth(), impeller::TSize< T >::height, impeller::Matrix::IsTranslationScaleOnly(), impeller::TRect< T >::TransformBounds(), and impeller::TSize< T >::width.

◆ IsAxisAlignedRect()

bool impeller::RoundRectGeometry::IsAxisAlignedRect ( ) const
overridevirtual

Reimplemented from impeller::Geometry.

Definition at line 79 of file round_rect_geometry.cc.

79  {
80  return false;
81 }

The documentation for this class was generated from the following files:
impeller::TRect::TransformBounds
constexpr TRect TransformBounds(const Matrix &transform) const
Creates a new bounding box that contains this transformed rectangle.
Definition: rect.h:405
impeller::Size
TSize< Scalar > Size
Definition: size.h:137
impeller::TRect::GetHeight
constexpr Type GetHeight() const
Returns the height of the rectangle, equivalent to |GetSize().height|.
Definition: rect.h:314
impeller::TRect::GetWidth
constexpr Type GetWidth() const
Returns the width of the rectangle, equivalent to |GetSize().width|.
Definition: rect.h:308
impeller::Rect
TRect< Scalar > Rect
Definition: rect.h:661
impeller::TSize::width
Type width
Definition: size.h:22
impeller::TSize::height
Type height
Definition: size.h:23
impeller::TRect::Expand
constexpr TRect< T > Expand(T left, T top, T right, T bottom) const
Returns a rectangle with expanded edges. Negative expansion results in shrinking.
Definition: rect.h:547