flutter::ColorFilterLayer Class Reference

#include <color_filter_layer.h>

Inheritance diagram for flutter::ColorFilterLayer:

Public Member Functions
	ColorFilterLayer (std::shared_ptr< const DlColorFilter > filter)
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::CacheableContainerLayer
	CacheableContainerLayer (int layer_cached_threshold=RasterCacheUtil::kMinimumRendersBeforeCachingFilterLayer, bool can_cache_children=false)
const LayerRasterCacheItem *	raster_cache_item () const
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)
Protected Attributes inherited from flutter::CacheableContainerLayer
std::unique_ptr< LayerRasterCacheItem >	layer_raster_cache_item_

Detailed Description

Definition at line 14 of file color_filter_layer.h.

Constructor & Destructor Documentation

ColorFilterLayer()

flutter::ColorFilterLayer::ColorFilterLayer ( std::shared_ptr< const DlColorFilter >  filter )

explicit

Definition at line 14 of file color_filter_layer.cc.

    : CacheableContainerLayer(
          RasterCacheUtil::kMinimumRendersBeforeCachingFilterLayer,
          true),
      filter_(std::move(filter)) {}

Member Function Documentation

Diff()

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

overridevirtual

Reimplemented from flutter::Layer.

Definition at line 20 of file color_filter_layer.cc.

                                                                        {
  DiffContext::AutoSubtreeRestore subtree(context);
  auto* prev = static_cast<const ColorFilterLayer*>(old_layer);
  if (!context->IsSubtreeDirty()) {
    FML_DCHECK(prev);
    if (NotEquals(filter_, prev->filter_)) {
      context->MarkSubtreeDirty(context->GetOldLayerPaintRegion(old_layer));
    }
  }
 
  if (context->has_raster_cache()) {
    context->WillPaintWithIntegralTransform();
  }
 
  DiffChildren(context, prev);
 
  context->SetLayerPaintRegion(this, context->CurrentSubtreeRegion());
}

Paint()

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

overridevirtual

Implements flutter::Layer.

Definition at line 64 of file color_filter_layer.cc.

                                                        {
  FML_DCHECK(needs_painting(context));
 
  auto mutator = context.state_stack.save();
 
  if (context.raster_cache) {
    // Always apply the integral transform in the presence of a raster cache
    // whether or not we will draw from the cache
    mutator.integralTransform();
 
    // Try drawing the layer cache item from the cache before applying the
    // color filter if it was cached with the filter applied.
    if (!layer_raster_cache_item_->IsCacheChildren()) {
      DlPaint paint;
      if (layer_raster_cache_item_->Draw(context,
                                         context.state_stack.fill(paint))) {
        return;
      }
    }
  }
 
  // Now apply the color filter and then try rendering children either from
  // cache or directly.
  mutator.applyColorFilter(paint_bounds(), filter_);
 
  if (context.raster_cache && layer_raster_cache_item_->IsCacheChildren()) {
    DlPaint paint;
    if (layer_raster_cache_item_->Draw(context,
                                       context.state_stack.fill(paint))) {
      return;
    }
  }
 
  PaintChildren(context);
}

Preroll()

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

overridevirtual

Implements flutter::Layer.

Definition at line 39 of file color_filter_layer.cc.

                                                      {
  Layer::AutoPrerollSaveLayerState save =
      Layer::AutoPrerollSaveLayerState::Create(context);
  AutoCache cache = AutoCache(layer_raster_cache_item_.get(), context,
                              context->state_stack.transform_3x3());
 
  ContainerLayer::Preroll(context);
 
  // Our saveLayer would apply any outstanding opacity or any outstanding
  // image filter before it applies our color filter, but that is in the
  // wrong order compared to how these attributes were applied to the tree
  // (they would have come from one of our ancestors). So we cannot apply
  // those attributes with our saveLayer normally.
  // However, some color filters can commute themselves with an opacity
  // modulation so in that case we can apply the opacity on behalf of our
  // ancestors - otherwise we can apply no attributes.
  if (filter_) {
    context->renderable_state_flags =
        filter_->can_commute_with_opacity()
            ? LayerStateStack::kCallerCanApplyOpacity
            : 0;
  }
  // else - we can apply whatever our children can apply.
}

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

• flow/layers/color_filter_layer.h
• flow/layers/color_filter_layer.cc