flutter::DlImageSkia Class Reference

#include <dl_image_skia.h>

Inheritance diagram for flutter::DlImageSkia:

Public Member Functions
	DlImageSkia (sk_sp< SkImage > image)
	~DlImageSkia () override
sk_sp< SkImage >	skia_image () const override
	If this display list image is meant to be used by the Skia backend, an SkImage instance. Null otherwise.
std::shared_ptr< impeller::Texture >	impeller_texture () const override
	If this display list image is meant to be used by the Impeller backend, an Impeller texture instance. Null otherwise.
bool	isOpaque () const override
	If the pixel format of this image ignores alpha, this returns true. This method might conservatively return false when it cannot guarnatee an opaque image, for example when the pixel format of the image supports alpha but the image is made up of entirely opaque pixels.
bool	isTextureBacked () const override
bool	isUIThreadSafe () const override
	If the underlying platform image held by this object has no threading requirements for the release of that image (or if arrangements have already been made to forward that image to the correct thread upon deletion), this method returns true.
SkISize	dimensions () const override
size_t	GetApproximateByteSize () const override
Public Member Functions inherited from flutter::DlImage
virtual	~DlImage ()
int	width () const
int	height () const
SkIRect	bounds () const
virtual OwningContext	owning_context () const
virtual std::optional< std::string >	get_error () const
bool	Equals (const DlImage *other) const
bool	Equals (const DlImage &other) const
bool	Equals (const sk_sp< const DlImage > &other) const
Public Member Functions inherited from SkRefCntBase
	SkRefCntBase ()
virtual	~SkRefCntBase ()
bool	unique () const
void	ref () const
void	unref () const

Additional Inherited Members
Public Types inherited from flutter::DlImage
enum class	OwningContext { kRaster , kIO }
Static Public Member Functions inherited from flutter::DlImage
static sk_sp< DlImage >	Make (const SkImage *image)
static sk_sp< DlImage >	Make (sk_sp< SkImage > image)
Protected Member Functions inherited from flutter::DlImage
	DlImage ()

Detailed Description

Definition at line 13 of file dl_image_skia.h.

Constructor & Destructor Documentation

DlImageSkia()

flutter::DlImageSkia::DlImageSkia ( sk_sp< SkImage >  image )

explicit

Definition at line 9 of file dl_image_skia.cc.

: image_(std::move(image)) {}

~DlImageSkia()

flutter::DlImageSkia::~DlImageSkia ( )

overridedefault

Member Function Documentation

dimensions()

SkISize flutter::DlImageSkia::dimensions ( ) const

overridevirtual

Returns

The dimensions of the pixel grid.

Implements flutter::DlImage.

Definition at line 46 of file dl_image_skia.cc.

                                      {
  return image_ ? image_->dimensions() : SkISize::MakeEmpty();
}

GetApproximateByteSize()

size_t flutter::DlImageSkia::GetApproximateByteSize ( ) const

overridevirtual

Returns

The approximate byte size of the allocation of this image. This takes into account details such as mip-mapping. The allocation is usually resident in device memory.

Implements flutter::DlImage.

Definition at line 51 of file dl_image_skia.cc.

                                                 {
  auto size = sizeof(*this);
  if (image_) {
    const auto& info = image_->imageInfo();
    const auto kMipmapOverhead = image_->hasMipmaps() ? 4.0 / 3.0 : 1.0;
    const size_t image_byte_size = info.computeMinByteSize() * kMipmapOverhead;
    size += image_byte_size;
  }
  return size;
}

impeller_texture()

std::shared_ptr< impeller::Texture > flutter::DlImageSkia::impeller_texture ( ) const

overridevirtual

If this display list image is meant to be used by the Impeller backend, an Impeller texture instance. Null otherwise.

Returns

An Impeller texture instance or null.

Implements flutter::DlImage.

Definition at line 20 of file dl_image_skia.cc.

                                                                   {
  return nullptr;
}

isOpaque()

bool flutter::DlImageSkia::isOpaque ( ) const

overridevirtual

If the pixel format of this image ignores alpha, this returns true. This method might conservatively return false when it cannot guarnatee an opaque image, for example when the pixel format of the image supports alpha but the image is made up of entirely opaque pixels.

Returns

True if the pixel format of this image ignores alpha.

Implements flutter::DlImage.

Definition at line 25 of file dl_image_skia.cc.

                                 {
  return image_ ? image_->isOpaque() : false;
}

isTextureBacked()

bool flutter::DlImageSkia::isTextureBacked ( ) const

overridevirtual

Implements flutter::DlImage.

Definition at line 30 of file dl_image_skia.cc.

                                        {
  return image_ ? image_->isTextureBacked() : false;
}

isUIThreadSafe()

bool flutter::DlImageSkia::isUIThreadSafe ( ) const

overridevirtual

If the underlying platform image held by this object has no threading requirements for the release of that image (or if arrangements have already been made to forward that image to the correct thread upon deletion), this method returns true.

Returns

True if the underlying image is held in a thread-safe manner.

Implements flutter::DlImage.

Definition at line 35 of file dl_image_skia.cc.

                                       {
  // Technically if the image is null then we are thread-safe, and possibly
  // if the image is constructed from a heap raster as well, but there
  // should never be a leak of an instance of this class into any data that
  // is shared with the UI thread, regardless of value.
  // All images intended to be shared with the UI thread should be constructed
  // via one of the DlImage subclasses designed for that purpose.
  return false;
}

skia_image()

sk_sp< SkImage > flutter::DlImageSkia::skia_image ( ) const

overridevirtual

If this display list image is meant to be used by the Skia backend, an SkImage instance. Null otherwise.

Returns

A Skia image instance or null.

Implements flutter::DlImage.

Definition at line 15 of file dl_image_skia.cc.

                                             {
  return image_;
};

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

• display_list/image/dl_image_skia.h
• display_list/image/dl_image_skia.cc