#include <SkBlurEngine.h>

Classes
class	Algorithm

Public Member Functions
virtual	~SkBlurEngine ()=default

virtual const Algorithm *	findAlgorithm (SkSize sigma, SkColorType colorType) const =0

Static Public Member Functions
static constexpr bool	IsEffectivelyIdentity (float sigma)

static int	SigmaToRadius (float sigma)

Detailed Description

SkBlurEngine is a backend-agnostic provider of blur algorithms. Each Skia backend defines a blur engine with a set of supported algorithms and/or implementations. A given implementation may be optimized for a particular color type, sigma range, or available hardware. Each engine and its algorithms are assumed to operate only on SkImages corresponding to its Skia backend, and will produce output SkImages of the same type.

Algorithms are allowed to specify a maximum supported sigma. If the desired sigma is higher than this, the input image and output region must be downscaled by the caller before invoking the algorithm. This is to provide the most flexibility for input representation (e.g. directly rasterize at half resolution or apply deferred filter effects during the first downsample pass).

skif::FilterResult::Builder::blur() is a convenient wrapper around the blur engine and automatically handles resizing.

Definition at line 45 of file SkBlurEngine.h.

Constructor & Destructor Documentation

◆ ~SkBlurEngine()

virtual SkBlurEngine::~SkBlurEngine ( )

virtualdefault

Member Function Documentation

◆ findAlgorithm()

virtual const Algorithm * SkBlurEngine::findAlgorithm	(	SkSize	sigma,
		SkColorType	colorType
	)		const

pure virtual

◆ IsEffectivelyIdentity()

static constexpr bool SkBlurEngine::IsEffectivelyIdentity ( float sigma )

inlinestaticconstexpr

Definition at line 63 of file SkBlurEngine.h.

63{ return sigma <= 0.03f; }

◆ SigmaToRadius()

static int SkBlurEngine::SigmaToRadius ( float sigma )

inlinestatic

Definition at line 67 of file SkBlurEngine.h.

                                          {
        // sk_float_ceil2int is not constexpr
        return IsEffectivelyIdentity(sigma) ? 0 : sk_float_ceil2int(3.f * sigma);
    }

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

third_party/skia/src/core/SkBlurEngine.h

Classes

Public Member Functions