flutter::PerformanceOverlayLayer Class Reference

#include <performance_overlay_layer.h>

Inheritance diagram for flutter::PerformanceOverlayLayer:

Public Member Functions
bool	IsReplacing (DiffContext *context, const Layer *layer) const override
void	Diff (DiffContext *context, const Layer *old_layer) override
const PerformanceOverlayLayer *	as_performance_overlay_layer () const override
	PerformanceOverlayLayer (uint64_t options, const char *font_path=nullptr)
void	Preroll (PrerollContext *context) override
void	Paint (PaintContext &context) const override
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
virtual void	Diff (DiffContext *context, const Layer *old_layer)
virtual void	PreservePaintRegion (DiffContext *context)
virtual void	Preroll (PrerollContext *context)=0
virtual void	Paint (PaintContext &context) const =0
virtual void	PaintChildren (PaintContext &context) 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 ContainerLayer *	as_container_layer () 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

Static Public Member Functions
static sk_sp< SkTextBlob >	MakeStatisticsText (const Stopwatch &stopwatch, const std::string &label_prefix, const std::string &font_path)

Additional Inherited Members
Static Public Attributes inherited from flutter::Layer
static constexpr int	kSaveLayerRenderFlags
static constexpr int	kRasterCacheRenderFlags

Detailed Description

Definition at line 23 of file performance_overlay_layer.h.

Constructor & Destructor Documentation

PerformanceOverlayLayer()

flutter::PerformanceOverlayLayer::PerformanceOverlayLayer ( uint64_t  options, const char *  font_path = nullptr  )

explicit

Definition at line 105 of file performance_overlay_layer.cc.

    : options_(options) {
  if (font_path != nullptr) {
    font_path_ = font_path;
  }
}

Member Function Documentation

as_performance_overlay_layer()

const PerformanceOverlayLayer * flutter::PerformanceOverlayLayer::as_performance_overlay_layer ( ) const

inlineoverridevirtual

Reimplemented from flutter::Layer.

Definition at line 35 of file performance_overlay_layer.h.

                                                                               {
    return this;
  }

Diff()

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

overridevirtual

Reimplemented from flutter::Layer.

Definition at line 113 of file performance_overlay_layer.cc.

                                                           {
  DiffContext::AutoSubtreeRestore subtree(context);
  if (!context->IsSubtreeDirty()) {
    FML_DCHECK(old_layer);
    auto prev = old_layer->as_performance_overlay_layer();
    context->MarkSubtreeDirty(context->GetOldLayerPaintRegion(prev));
  }
  context->AddLayerBounds(paint_bounds());
  context->SetLayerPaintRegion(this, context->CurrentSubtreeRegion());
}

IsReplacing()

bool flutter::PerformanceOverlayLayer::IsReplacing ( DiffContext *  context, const Layer *  layer  ) const

inlineoverridevirtual

Reimplemented from flutter::Layer.

Definition at line 29 of file performance_overlay_layer.h.

                                                                            {
    return layer->as_performance_overlay_layer() != nullptr;
  }

MakeStatisticsText()

sk_sp< SkTextBlob > flutter::PerformanceOverlayLayer::MakeStatisticsText ( const Stopwatch &  stopwatch, const std::string &  label_prefix, const std::string &  font_path  )

static

Definition at line 72 of file performance_overlay_layer.cc.

                                {
  SkFont font;
  sk_sp<SkFontMgr> font_mgr = txt::GetDefaultFontManager();
  if (font_path == "") {
    if (sk_sp<SkTypeface> face = font_mgr->matchFamilyStyle(nullptr, {})) {
      font = SkFont(face, 15);
    } else {
      // In Skia's Android fontmgr, matchFamilyStyle can return null instead
      // of falling back to a default typeface. If that's the case, we can use
      // legacyMakeTypeface, which *does* use that default typeface.
      font = SkFont(font_mgr->legacyMakeTypeface(nullptr, {}), 15);
    }
  } else {
    font = SkFont(font_mgr->makeFromFile(font_path.c_str()), 15);
  }
  // Make sure there's not an empty typeface returned, or we won't see any text.
  FML_DCHECK(font.getTypeface()->countGlyphs() > 0);
 
  double max_ms_per_frame = stopwatch.MaxDelta().ToMillisecondsF();
  double average_ms_per_frame = stopwatch.AverageDelta().ToMillisecondsF();
  std::stringstream stream;
  stream.setf(std::ios::fixed | std::ios::showpoint);
  stream << std::setprecision(1);
  stream << label_prefix << "  " << "max " << max_ms_per_frame << " ms/frame, "
         << "avg " << average_ms_per_frame << " ms/frame";
  auto text = stream.str();
  return SkTextBlob::MakeFromText(text.c_str(), text.size(), font,
                                  SkTextEncoding::kUTF8);
}

Paint()

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

overridevirtual

Implements flutter::Layer.

Definition at line 125 of file performance_overlay_layer.cc.

                                                               {
  const int padding = 8;
 
  if (!options_) {
    return;
  }
 
  SkScalar x = paint_bounds().x() + padding;
  SkScalar y = paint_bounds().y() + padding;
  SkScalar width = paint_bounds().width() - (padding * 2);
  SkScalar height = paint_bounds().height() / 2;
  auto mutator = context.state_stack.save();
 
  VisualizeStopWatch(
      context.canvas, context.impeller_enabled, context.raster_time, x, y,
      width, height - padding, options_ & kVisualizeRasterizerStatistics,
      options_ & kDisplayRasterizerStatistics, "Raster", font_path_);
 
  VisualizeStopWatch(context.canvas, context.impeller_enabled, context.ui_time,
                     x, y + height, width, height - padding,
                     options_ & kVisualizeEngineStatistics,
                     options_ & kDisplayEngineStatistics, "UI", font_path_);
}

Preroll()

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

inlineoverridevirtual

Implements flutter::Layer.

Definition at line 42 of file performance_overlay_layer.h.

{}

---

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

• flow/layers/performance_overlay_layer.h
• flow/layers/performance_overlay_layer.cc