flutter::BackdropFilterLayer Class Reference

#include <backdrop_filter_layer.h>

Inheritance diagram for flutter::BackdropFilterLayer:

Public Member Functions
	BackdropFilterLayer (std::shared_ptr< const DlImageFilter > filter, DlBlendMode blend_mode)
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	Diff (DiffContext *context, const Layer *old_layer) override
void	PreservePaintRegion (DiffContext *context) override
virtual void	Add (std::shared_ptr< Layer > layer)
void	Preroll (PrerollContext *context) override
void	Paint (PaintContext &context) const override
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 SkRect &	child_paint_bounds () const
void	set_child_paint_bounds (const SkRect &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 SkRect &	paint_bounds () const
void	set_paint_bounds (const SkRect &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, SkRect *child_paint_bounds)

Detailed Description

Definition at line 13 of file backdrop_filter_layer.h.

Constructor & Destructor Documentation

BackdropFilterLayer()

flutter::BackdropFilterLayer::BackdropFilterLayer	(	std::shared_ptr< const DlImageFilter >	filter,
		DlBlendMode	blend_mode
	)

Definition at line 9 of file backdrop_filter_layer.cc.

    : filter_(std::move(filter)), blend_mode_(blend_mode) {}

Member Function Documentation

Diff()

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

overridevirtual

Reimplemented from flutter::Layer.

Definition at line 14 of file backdrop_filter_layer.cc.

                                                                           {
  DiffContext::AutoSubtreeRestore subtree(context);
  auto* prev = static_cast<const BackdropFilterLayer*>(old_layer);
  if (!context->IsSubtreeDirty()) {
    FML_DCHECK(prev);
    if (NotEquals(filter_, prev->filter_)) {
      context->MarkSubtreeDirty(context->GetOldLayerPaintRegion(old_layer));
    }
  }
 
  // Backdrop filter paints everywhere in cull rect
  auto paint_bounds = context->GetCullRect();
  context->AddLayerBounds(paint_bounds);
 
  if (filter_) {
    paint_bounds = context->MapRect(paint_bounds);
    auto filter_target_bounds = paint_bounds.roundOut();
    SkIRect filter_input_bounds;  // in screen coordinates
    filter_->get_input_device_bounds(
        filter_target_bounds, context->GetTransform3x3(), filter_input_bounds);
    context->AddReadbackRegion(filter_target_bounds, filter_input_bounds);
  }
 
  DiffChildren(context, prev);
 
  context->SetLayerPaintRegion(this, context->CurrentSubtreeRegion());
}

Paint()

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

overridevirtual

Implements flutter::Layer.

Definition at line 56 of file backdrop_filter_layer.cc.

                                                           {
  FML_DCHECK(needs_painting(context));
 
  auto mutator = context.state_stack.save();
  mutator.applyBackdropFilter(paint_bounds(), filter_, blend_mode_);
 
  PaintChildren(context);
}

Preroll()

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

overridevirtual

Implements flutter::Layer.

Definition at line 42 of file backdrop_filter_layer.cc.

                                                         {
  Layer::AutoPrerollSaveLayerState save =
      Layer::AutoPrerollSaveLayerState::Create(context, true, bool(filter_));
  if (filter_ && context->view_embedder != nullptr) {
    context->view_embedder->PushFilterToVisitedPlatformViews(
        filter_, context->state_stack.device_cull_rect());
  }
  SkRect child_paint_bounds = SkRect::MakeEmpty();
  PrerollChildren(context, &child_paint_bounds);
  child_paint_bounds.join(context->state_stack.local_cull_rect());
  set_paint_bounds(child_paint_bounds);
  context->renderable_state_flags = kSaveLayerRenderFlags;
}

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

• flow/layers/backdrop_filter_layer.h
• flow/layers/backdrop_filter_layer.cc