Flutter Impeller
impeller::RectGeometry Class Referencefinal

#include <rect_geometry.h>

Inheritance diagram for impeller::RectGeometry:
impeller::Geometry

Public Member Functions

 RectGeometry (Rect rect)
 
 ~RectGeometry ()=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
 
GeometryResult GetPositionBuffer (const ContentContext &renderer, const Entity &entity, RenderPass &pass) const override
 
GeometryVertexType GetVertexType () const override
 
std::optional< RectGetCoverage (const Matrix &transform) const override
 
GeometryResult GetPositionUVBuffer (Rect texture_coverage, Matrix effect_transform, const ContentContext &renderer, const Entity &entity, RenderPass &pass) 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 12 of file rect_geometry.h.

Constructor & Destructor Documentation

◆ RectGeometry()

impeller::RectGeometry::RectGeometry ( Rect  rect)
explicit

Definition at line 9 of file rect_geometry.cc.

9 : rect_(rect) {}

◆ ~RectGeometry()

impeller::RectGeometry::~RectGeometry ( )
default

Member Function Documentation

◆ CoversArea()

bool impeller::RectGeometry::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 rect_geometry.cc.

46  {
47  if (!transform.IsTranslationScaleOnly()) {
48  return false;
49  }
50  Rect coverage = rect_.TransformBounds(transform);
51  return coverage.Contains(rect);
52 }

References impeller::TRect< T >::Contains(), impeller::Matrix::IsTranslationScaleOnly(), and impeller::TRect< T >::TransformBounds().

◆ GetCoverage()

std::optional< Rect > impeller::RectGeometry::GetCoverage ( const Matrix transform) const
overridevirtual

Implements impeller::Geometry.

Definition at line 42 of file rect_geometry.cc.

42  {
43  return rect_.TransformBounds(transform);
44 }

References impeller::TRect< T >::TransformBounds().

◆ GetPositionBuffer()

GeometryResult impeller::RectGeometry::GetPositionBuffer ( const ContentContext renderer,
const Entity entity,
RenderPass pass 
) const
overridevirtual

Implements impeller::Geometry.

Definition at line 11 of file rect_geometry.cc.

13  {
14  auto& host_buffer = renderer.GetTransientsBuffer();
15  return GeometryResult{
17  .vertex_buffer =
18  {
19  .vertex_buffer = host_buffer.Emplace(
20  rect_.GetPoints().data(), 8 * sizeof(float), alignof(float)),
21  .vertex_count = 4,
22  .index_type = IndexType::kNone,
23  },
24  .transform = entity.GetShaderTransform(pass),
25  };
26 }

References impeller::TRect< T >::GetPoints(), impeller::Entity::GetShaderTransform(), impeller::ContentContext::GetTransientsBuffer(), impeller::kNone, impeller::kTriangleStrip, and impeller::GeometryResult::type.

◆ GetPositionUVBuffer()

GeometryResult impeller::RectGeometry::GetPositionUVBuffer ( Rect  texture_coverage,
Matrix  effect_transform,
const ContentContext renderer,
const Entity entity,
RenderPass pass 
) const
overridevirtual

Implements impeller::Geometry.

Definition at line 29 of file rect_geometry.cc.

33  {
34  return ComputeUVGeometryForRect(rect_, texture_coverage, effect_transform,
35  renderer, entity, pass);
36 }

References impeller::ComputeUVGeometryForRect().

◆ GetVertexType()

GeometryVertexType impeller::RectGeometry::GetVertexType ( ) const
overridevirtual

Implements impeller::Geometry.

Definition at line 38 of file rect_geometry.cc.

38  {
40 }

References impeller::kPosition.

◆ IsAxisAlignedRect()

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

Reimplemented from impeller::Geometry.

Definition at line 54 of file rect_geometry.cc.

54  {
55  return true;
56 }

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::TRect::GetPoints
constexpr std::array< TPoint< T >, 4 > GetPoints() const
Get the points that represent the 4 corners of this rectangle in a Z order that is compatible with tr...
Definition: rect.h:382
impeller::PrimitiveType::kTriangleStrip
@ kTriangleStrip
impeller::IndexType::kNone
@ kNone
Does not use the index buffer.
impeller::Rect
TRect< Scalar > Rect
Definition: rect.h:661
impeller::TRect::Contains
constexpr bool Contains(const TPoint< Type > &p) const
Returns true iff the provided point |p| is inside the half-open interior of this rectangle.
Definition: rect.h:217
impeller::ComputeUVGeometryForRect
GeometryResult ComputeUVGeometryForRect(Rect source_rect, Rect texture_bounds, Matrix effect_transform, const ContentContext &renderer, const Entity &entity, RenderPass &pass)
Computes geometry and UV coordinates for a rectangle to be rendered.
Definition: geometry.cc:113
impeller::kPosition
@ kPosition
Definition: geometry.h:50