SkImageInfo Reference

Image Info

Overview

Subtopics

name	description
Constructors	functions that construct SkImageInfo
Member Functions	static functions and member methods
Operators	operator overloading methods

Constants

name	description

Alpha Type

Enum SkAlphaType

Describes how to interpret the alpha component of a pixel.

Constants

Example

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Color Type

Enum SkColorType

Describes how to interpret the components of a pixel. kN32 SkColorType is an alias for whichever 32 bit Color ARGB format is the "" form for skia‘s blitters. Use this if you don’t have a swizzle preference for 32 bit pixels.

Constants

Constants

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Enum SkYUVColorSpace

Describes the color space a YUV pixel.

Constants

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Enum SkDestinationSurfaceColorMode

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Struct SkImageInfo

Describe an image's dimensions and pixel type. Used for both src images and render-targets (surfaces).

Operators

name	description
operator!=(const SkImageInfo& other) const	incomplete
operator==(const SkImageInfo& other) const	incomplete

Member Functions

name	description
ByteSizeOverflowed	incomplete
Make	creates Image Info from dimensions, Color Type, Alpha Type, Color Space
MakeA8	creates Image Info with kAlpha 8 SkColorType, kPremul SkAlphaType
MakeN32	creates Image Info with Native Color Type
MakeN32Premul	creates Image Info with Native Color Type, kPremul SkAlphaType
MakeS32	creates Image Info with Native Color Type, sRGB Color Space
MakeUnknown	creates Image Info with kUnknown SkColorType, kUnknown SkAlphaType
alphaType	incomplete
bounds	incomplete
bytesPerPixel	incomplete
colorSpace	incomplete
colorType	incomplete
computeByteSize	incomplete
computeMinByteSize	incomplete
computeOffset	incomplete
dimensions	incomplete
flatten	incomplete
gammaCloseToSRGB	incomplete
height	incomplete
isEmpty	incomplete
isOpaque	incomplete
makeAlphaType	creates Image Info with changed Alpha Type
makeColorSpace	creates Image Info with changed Color Space
makeColorType	creates Image Info with changed Color Type
makeWH	creates Image Info with changed dimensions
minRowBytes	incomplete
minRowBytes64	incomplete
refColorSpace	incomplete
reset	incomplete
shiftPerPixel	incomplete
unflatten	incomplete
validRowBytes	incomplete
validate	incomplete
width	incomplete

Constructors

name	description
Make	creates Image Info from dimensions, Color Type, Alpha Type, Color Space
MakeA8	creates Image Info with kAlpha 8 SkColorType, kPremul SkAlphaType
MakeN32	creates Image Info with Native Color Type
MakeN32Premul	creates Image Info with Native Color Type, kPremul SkAlphaType
MakeS32	creates Image Info with Native Color Type, sRGB Color Space
MakeUnknown	creates Image Info with kUnknown SkColorType, kUnknown SkAlphaType
SkImageInfo()	creates with zero dimensions, kUnknown SkColorType, kUnknown SkAlphaType
makeAlphaType	creates Image Info with changed Alpha Type
makeColorSpace	creates Image Info with changed Color Space
makeColorType	creates Image Info with changed Color Type
makeWH	creates Image Info with changed dimensions

SkImageInfo

Return Value

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Example

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Make

Parameters

Return Value

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MakeN32

Sets colortype to kN32 SkColorType.

Parameters

Return Value

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MakeS32

Creates Image Info marked as sRGB with kN32 SkColorType swizzle.

Parameters

Return Value

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Example

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MakeN32Premul

Sets colortype to kN32 SkColorType, and the alphatype to premul.

Parameters

Return Value

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Parameters

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MakeA8

Parameters

Return Value

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MakeUnknown

Parameters

Return Value

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Return Value

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width

Return Value

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height

Return Value

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colorType

Return Value

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alphaType

Return Value

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colorSpace

Return Value

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refColorSpace

Return Value

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isEmpty

Return Value

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isOpaque

Return Value

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dimensions

Return Value

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bounds

Return Value

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gammaCloseToSRGB

Return Value

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Example

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makeWH

Creates Image Info with the same colortype and alphatype as this info, but with the specified width and height.

Parameters

Return Value

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makeAlphaType

Parameters

Return Value

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Example

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makeColorType

Parameters

Return Value

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makeColorSpace

Parameters

Return Value

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bytesPerPixel

Return Value

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shiftPerPixel

Return Value

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minRowBytes64

Return Value

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minRowBytes

Return Value

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computeOffset

Parameters

Return Value

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operator==

Parameters

Return Value

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operator!=

Parameters

Return Value

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unflatten

Parameters

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flatten

Parameters

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computeByteSize

Returns the size (in bytes) of the image buffer that this info needs, given the specified rowBytes. The rowBytes must be >= this->minRowBytes. if (height == 0) { return 0; } else { return (height - 1) * rowBytes + width * bytes_per_pixel.

If the calculation overflows this returns SK MaxSizeT.

Parameters

Return Value

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computeMinByteSize

Returns the minimum size (in bytes) of the image buffer that this info needs. If the calculation overflows, or if the height is 0, this returns 0.

Return Value

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ByteSizeOverflowed

Returns true if the result of computeByteSize (or computeMinByteSize) overflowed

Parameters

Return Value

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validRowBytes

Parameters

Return Value

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reset

Example

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validate

Example

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