flutter::DlOpSpy Class Reference

#include <dl_op_spy.h>

Inheritance diagram for flutter::DlOpSpy:

Public Member Functions
bool	did_draw ()
	Returns true if any non transparent content has been drawn.
Public Member Functions inherited from flutter::DlOpReceiver
virtual void	save (uint32_t total_content_depth)
virtual void	saveLayer (const DlRect &bounds, const SaveLayerOptions &options, uint32_t total_content_depth, DlBlendMode max_content_blend_mode, const DlImageFilter *backdrop=nullptr, std::optional< int64_t > backdrop_id=std::nullopt)
virtual void	saveLayer (const DlRect *bounds, const SaveLayerOptions options, const DlImageFilter *backdrop=nullptr, std::optional< int64_t > backdrop_id=std::nullopt) final

Additional Inherited Members
Static Public Attributes inherited from flutter::DlOpReceiver
static constexpr int	kMaxDrawPointsCount = ((1 << 29) - 1)

Detailed Description

Receives to drawing commands of a DisplayListBuilder.

This is used to determine whether any non-transparent pixels will be drawn on the canvas. All the drawImage operations are considered drawing non-transparent pixels.

To use this class, dispatch the operations from DisplayList to a concrete DlOpSpy object, and check the result of did_draw method.

DlOpSpy dl_op_spy;
display_list.Dispatch(dl_op_spy);
bool did_draw = dl_op_spy.did_draw()

Definition at line 29 of file dl_op_spy.h.

Member Function Documentation

did_draw()

bool flutter::DlOpSpy::did_draw

(

)

Returns true if any non transparent content has been drawn.

Definition at line 9 of file dl_op_spy.cc.

                       {
  return did_draw_;
}

Referenced by flutter::EmbedderExternalView::HasEngineRenderedContents(), flutter::testing::TEST(), and flutter::testing::TEST().

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

• shell/common/dl_op_spy.h
• shell/common/dl_op_spy.cc