flutter::TransformLayer Class Reference

#include <transform_layer.h>

Inheritance diagram for flutter::TransformLayer:

Public Member Functions
	TransformLayer (const DlMatrix &transform)
void	Diff (DiffContext *context, const Layer *old_layer) override
void	Preroll (PrerollContext *context) override
void	Paint (PaintContext &context) const override
Public Member Functions inherited from flutter::ContainerLayer
	ContainerLayer ()
void	PreservePaintRegion (DiffContext *context) override
virtual void	Add (std::shared_ptr< Layer > layer)
const std::vector< std::shared_ptr< Layer > > &	layers () const
virtual void	DiffChildren (DiffContext *context, const ContainerLayer *old_layer)
void	PaintChildren (PaintContext &context) const override
const ContainerLayer *	as_container_layer () const override
const DlRect &	child_paint_bounds () const
void	set_child_paint_bounds (const DlRect &bounds)
int	children_renderable_state_flags () const
void	set_children_renderable_state_flags (int flags)
Public Member Functions inherited from flutter::Layer
	Layer ()
virtual	~Layer ()
void	AssignOldLayer (Layer *old_layer)
virtual bool	IsReplacing (DiffContext *context, const Layer *old_layer) const
bool	subtree_has_platform_view () const
void	set_subtree_has_platform_view (bool value)
const DlRect &	paint_bounds () const
void	set_paint_bounds (const DlRect &paint_bounds)
bool	is_empty () const
bool	needs_painting (PaintContext &context) const
uint64_t	original_layer_id () const
uint64_t	unique_id () const
virtual RasterCacheKeyID	caching_key_id () const
virtual const DisplayListLayer *	as_display_list_layer () const
virtual const TextureLayer *	as_texture_layer () const
virtual const PerformanceOverlayLayer *	as_performance_overlay_layer () const
virtual const testing::MockLayer *	as_mock_layer () const

Additional Inherited Members
Static Public Attributes inherited from flutter::Layer
static constexpr int	kSaveLayerRenderFlags
static constexpr int	kRasterCacheRenderFlags
Protected Member Functions inherited from flutter::ContainerLayer
void	PrerollChildren (PrerollContext *context, DlRect *child_paint_bounds)

Detailed Description

Definition at line 12 of file transform_layer.h.

Constructor & Destructor Documentation

TransformLayer()

flutter::TransformLayer::TransformLayer ( const DlMatrix &  transform )

explicit

Definition at line 11 of file transform_layer.cc.

    : transform_(transform) {
  FML_DCHECK(transform_.IsFinite());
  if (!transform_.IsFinite()) {
    FML_LOG(ERROR) << "TransformLayer is constructed with an invalid matrix.";
    transform_ = {};
  }
}

References FML_DCHECK, FML_LOG, and impeller::Matrix::IsFinite().

Member Function Documentation

Diff()

void flutter::TransformLayer::Diff ( DiffContext *  context, const Layer *  old_layer  )

overridevirtual

Reimplemented from flutter::ContainerLayer.

Definition at line 20 of file transform_layer.cc.

                                                                      {
  DiffContext::AutoSubtreeRestore subtree(context);
  auto* prev = static_cast<const TransformLayer*>(old_layer);
  if (!context->IsSubtreeDirty()) {
    FML_DCHECK(prev);
    if (transform_ != prev->transform_) {
      context->MarkSubtreeDirty(context->GetOldLayerPaintRegion(old_layer));
    }
  }
  context->PushTransform(transform_);
  DiffChildren(context, prev);
  context->SetLayerPaintRegion(this, context->CurrentSubtreeRegion());
}

References flutter::DiffContext::CurrentSubtreeRegion(), flutter::ContainerLayer::DiffChildren(), FML_DCHECK, flutter::DiffContext::GetOldLayerPaintRegion(), flutter::DiffContext::IsSubtreeDirty(), flutter::DiffContext::MarkSubtreeDirty(), flutter::DiffContext::PushTransform(), and flutter::DiffContext::SetLayerPaintRegion().

Paint()

void flutter::TransformLayer::Paint ( PaintContext &  context ) const

overridevirtual

Reimplemented from flutter::ContainerLayer.

Definition at line 45 of file transform_layer.cc.

                                                      {
  FML_DCHECK(needs_painting(context));
 
  auto mutator = context.state_stack.save();
  mutator.transform(transform_);
 
  PaintChildren(context);
}

References FML_DCHECK, flutter::Layer::needs_painting(), flutter::ContainerLayer::PaintChildren(), flutter::LayerStateStack::save(), flutter::PaintContext::state_stack, and flutter::LayerStateStack::MutatorContext::transform().

Preroll()

void flutter::TransformLayer::Preroll ( PrerollContext *  context )

overridevirtual

Reimplemented from flutter::ContainerLayer.

Definition at line 34 of file transform_layer.cc.

                                                    {
  auto mutator = context->state_stack.save();
  mutator.transform(transform_);
 
  DlRect child_paint_bounds;
  PrerollChildren(context, &child_paint_bounds);
 
  child_paint_bounds = child_paint_bounds.TransformAndClipBounds(transform_);
  set_paint_bounds(child_paint_bounds);
}

References flutter::ContainerLayer::child_paint_bounds(), flutter::ContainerLayer::PrerollChildren(), flutter::LayerStateStack::save(), flutter::Layer::set_paint_bounds(), flutter::PrerollContext::state_stack, flutter::LayerStateStack::MutatorContext::transform(), and impeller::TRect< T >::TransformAndClipBounds().

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The documentation for this class was generated from the following files:

• flow/layers/transform_layer.h
• flow/layers/transform_layer.cc