vips

package
v1.3.9-0...-b7ab190 Latest Latest
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 Go to latest Published: Oct 17, 2020 License: MIT Imports: 17 Imported by: 0

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Index

Constants

View Source 
const DefaultFont = "sans 10"
View Source 
const MajorVersion = int(C.VIPS_MAJOR_VERSION)

noinspection GoUnusedConst

View Source 
const MicroVersion = int(C.VIPS_MICRO_VERSION) // A.K.A patch version

noinspection GoUnusedConst

View Source 
const MinorVersion = int(C.VIPS_MINOR_VERSION)

noinspection GoUnusedConst

View Source 
const Version = string(C.VIPS_VERSION)

noinspection GoUnusedConst

Variables

View Source 
var (
	// ErrUnsupportedImageFormat when image type is unsupported
	ErrUnsupportedImageFormat = errors.New("unsupported image format")
)
View Source 
var ImageTypes = map[ImageType]string{
	ImageTypeGIF:    "gif",
	ImageTypeJPEG:   "jpeg",
	ImageTypeMagick: "magick",
	ImageTypePDF:    "pdf",
	ImageTypePNG:    "png",
	ImageTypeSVG:    "svg",
	ImageTypeTIFF:   "tiff",
	ImageTypeWEBP:   "webp",
	ImageTypeHEIF:   "heif",
	ImageTypeBMP:    "bmp",
}

Functions

func ClearCache 

func ClearCache()

noinspection GoUnusedExportedFunction

func IsTypeSupported 

func IsTypeSupported(imageType ImageType) bool

func PrintCache 

func PrintCache()

noinspection GoUnusedExportedFunction

func PrintObjectReport 

func PrintObjectReport(label string)

PrintObjectReport outputs all of the current internal objects in libvips

func ReadRuntimeStats 

func ReadRuntimeStats(stats *RuntimeStats)

func ReadVipsMemStats 

func ReadVipsMemStats(stats *MemoryStats)

func Shutdown 

func Shutdown()

Shutdown libvips

func ShutdownThread 

func ShutdownThread()

ShutdownThread clears the cache for for the given thread

func Startup 

func Startup(config *Config)

Startup sets up the libvips support and ensures the versions are correct. Pass in nil for default configuration.

Types

type Align 

type Align int

Align represents VIPS_ALIGN 

const (
	AlignLow    Align = C.VIPS_ALIGN_LOW
	AlignCenter Align = C.VIPS_ALIGN_CENTRE
	AlignHigh   Align = C.VIPS_ALIGN_HIGH
)

Direction enum

type Angle 

type Angle int

Angle represents VIPS_ANGLE type 

const (
	Angle0   Angle = C.VIPS_ANGLE_D0
	Angle90  Angle = C.VIPS_ANGLE_D90
	Angle180 Angle = C.VIPS_ANGLE_D180
	Angle270 Angle = C.VIPS_ANGLE_D270
)

Angle enum

func GetRotationAngleFromExif 

func GetRotationAngleFromExif(orientation int) (Angle, bool)

type Angle45 

type Angle45 int

Angle45 represents VIPS_ANGLE45 type 

const (
	Angle45_0   Angle45 = C.VIPS_ANGLE45_D0
	Angle45_45  Angle45 = C.VIPS_ANGLE45_D45
	Angle45_90  Angle45 = C.VIPS_ANGLE45_D90
	Angle45_135 Angle45 = C.VIPS_ANGLE45_D135
	Angle45_180 Angle45 = C.VIPS_ANGLE45_D180
	Angle45_225 Angle45 = C.VIPS_ANGLE45_D225
	Angle45_270 Angle45 = C.VIPS_ANGLE45_D270
	Angle45_315 Angle45 = C.VIPS_ANGLE45_D315
)

Angle45 enum

type BandFormat 

type BandFormat int

BandFormat represents VIPS_FORMAT type 

const (
	BandFormatNotSet    BandFormat = C.VIPS_FORMAT_NOTSET
	BandFormatUchar     BandFormat = C.VIPS_FORMAT_UCHAR
	BandFormatChar      BandFormat = C.VIPS_FORMAT_CHAR
	BandFormatUshort    BandFormat = C.VIPS_FORMAT_USHORT
	BandFormatShort     BandFormat = C.VIPS_FORMAT_SHORT
	BandFormatUint      BandFormat = C.VIPS_FORMAT_UINT
	BandFormatInt       BandFormat = C.VIPS_FORMAT_INT
	BandFormatFloat     BandFormat = C.VIPS_FORMAT_FLOAT
	BandFormatComplex   BandFormat = C.VIPS_FORMAT_COMPLEX
	BandFormatDouble    BandFormat = C.VIPS_FORMAT_DOUBLE
	BandFormatDpComplex BandFormat = C.VIPS_FORMAT_DPCOMPLEX
)

BandFormat enum

type BlendMode 

type BlendMode int
const (
	BlendModeClear      BlendMode = C.VIPS_BLEND_MODE_CLEAR
	BlendModeSource     BlendMode = C.VIPS_BLEND_MODE_SOURCE
	BlendModeOver       BlendMode = C.VIPS_BLEND_MODE_OVER
	BlendModeIn         BlendMode = C.VIPS_BLEND_MODE_IN
	BlendModeOut        BlendMode = C.VIPS_BLEND_MODE_OUT
	BlendModeAtop       BlendMode = C.VIPS_BLEND_MODE_ATOP
	BlendModeDest       BlendMode = C.VIPS_BLEND_MODE_DEST
	BlendModeDestOver   BlendMode = C.VIPS_BLEND_MODE_DEST_OVER
	BlendModeDestIn     BlendMode = C.VIPS_BLEND_MODE_DEST_IN
	BlendModeDestOut    BlendMode = C.VIPS_BLEND_MODE_DEST_OUT
	BlendModeDestAtop   BlendMode = C.VIPS_BLEND_MODE_DEST_ATOP
	BlendModeXOR        BlendMode = C.VIPS_BLEND_MODE_XOR
	BlendModeAdd        BlendMode = C.VIPS_BLEND_MODE_ADD
	BlendModeSaturate   BlendMode = C.VIPS_BLEND_MODE_SATURATE
	BlendModeMultiply   BlendMode = C.VIPS_BLEND_MODE_MULTIPLY
	BlendModeScreen     BlendMode = C.VIPS_BLEND_MODE_SCREEN
	BlendModeOverlay    BlendMode = C.VIPS_BLEND_MODE_OVERLAY
	BlendModeDarken     BlendMode = C.VIPS_BLEND_MODE_DARKEN
	BlendModeLighten    BlendMode = C.VIPS_BLEND_MODE_LIGHTEN
	BlendModeColorDodge BlendMode = C.VIPS_BLEND_MODE_COLOUR_DODGE
	BlendModeColorBurn  BlendMode = C.VIPS_BLEND_MODE_COLOUR_BURN
	BlendModeHardLight  BlendMode = C.VIPS_BLEND_MODE_HARD_LIGHT
	BlendModeSoftLight  BlendMode = C.VIPS_BLEND_MODE_SOFT_LIGHT
	BlendModeDifference BlendMode = C.VIPS_BLEND_MODE_DIFFERENCE
	BlendModeExclusion  BlendMode = C.VIPS_BLEND_MODE_EXCLUSION
)

type Coding 

type Coding int

Coding represents VIPS_CODING type 

const (
	CodingError Coding = C.VIPS_CODING_ERROR
	CodingNone  Coding = C.VIPS_CODING_NONE
	CodingLABQ  Coding = C.VIPS_CODING_LABQ
	CodingRAD   Coding = C.VIPS_CODING_RAD
)

Coding enum

type Color 

type Color struct {
	R, G, B uint8
}

Color represents an RGB

type Config 

type Config struct {
	ConcurrencyLevel int
	MaxCacheFiles    int
	MaxCacheMem      int
	MaxCacheSize     int
	ReportLeaks      bool
	CacheTrace       bool
	CollectStats     bool
}

Config allows fine-tuning of libvips library

type Direction 

type Direction int

Direction represents VIPS_DIRECTION type 

const (
	DirectionHorizontal Direction = C.VIPS_DIRECTION_HORIZONTAL
	DirectionVertical   Direction = C.VIPS_DIRECTION_VERTICAL
)

Direction enum

type ExportParams 

type ExportParams struct {
	Format      ImageType
	Quality     int
	Compression int
	Interlaced  bool
	Lossless    bool
	Effort      int
}

ExportParams are options when exporting an image to file or buffer

func NewDefaultExportParams 

func NewDefaultExportParams() *ExportParams

func NewDefaultJPEGExportParams 

func NewDefaultJPEGExportParams() *ExportParams

func NewDefaultPNGExportParams 

func NewDefaultPNGExportParams() *ExportParams

func NewDefaultWEBPExportParams 

func NewDefaultWEBPExportParams() *ExportParams

type ExtendStrategy 

type ExtendStrategy int

ExtendStrategy represents VIPS_EXTEND type 

const (
	ExtendBlack      ExtendStrategy = C.VIPS_EXTEND_BLACK
	ExtendCopy       ExtendStrategy = C.VIPS_EXTEND_COPY
	ExtendRepeat     ExtendStrategy = C.VIPS_EXTEND_REPEAT
	ExtendMirror     ExtendStrategy = C.VIPS_EXTEND_MIRROR
	ExtendWhite      ExtendStrategy = C.VIPS_EXTEND_WHITE
	ExtendBackground ExtendStrategy = C.VIPS_EXTEND_BACKGROUND
)

ExtendStrategy enum

type ImageMetadata 

type ImageMetadata struct {
	Format      ImageType
	Width       int
	Height      int
	Colorspace  Interpretation
	Orientation int
}

type ImageRef 

type ImageRef struct {
	// contains filtered or unexported fields
}

ImageRef contains a libvips image and manages its lifecycle. You need to close an image when done or it will leak

func NewImageFromBuffer 

func NewImageFromBuffer(buf []byte) (*ImageRef, error)

NewImageFromBuffer loads an image buffer and creates a new Image

func NewImageFromFile 

func NewImageFromFile(file string) (*ImageRef, error)

NewImageFromFile loads an image from file and creates a new ImageRef

func NewImageFromReader 

func NewImageFromReader(r io.Reader) (*ImageRef, error)

NewImageFromReader loads an ImageRef from the given reader

func (*ImageRef) AddAlpha 

func (r *ImageRef) AddAlpha() error

func (*ImageRef) AutoRotate 

func (r *ImageRef) AutoRotate() error

func (*ImageRef) BandFormat 

func (r *ImageRef) BandFormat() BandFormat

BandFormat returns the current band format

func (*ImageRef) BandJoin 

func (r *ImageRef) BandJoin(images ...*ImageRef) error

func (*ImageRef) Bands 

func (r *ImageRef) Bands() int

Bands returns the number of bands for this image

func (*ImageRef) Close 

func (r *ImageRef) Close()

Close closes an image and frees internal memory associated with it

func (*ImageRef) Coding 

func (r *ImageRef) Coding() Coding

Coding returns the image coding

func (*ImageRef) ColorSpace 

func (r *ImageRef) ColorSpace() Interpretation

Alias to Interpretation()

func (*ImageRef) Composite 

func (r *ImageRef) Composite(overlay *ImageRef, mode BlendMode, x, y int) error

func (*ImageRef) Copy 

func (r *ImageRef) Copy() (*ImageRef, error)

create a new ref deprecated

func (*ImageRef) Embed 

func (r *ImageRef) Embed(left, top, width, height int, extend ExtendStrategy) error

Embed executes the 'embed' operation

func (*ImageRef) Export 

func (r *ImageRef) Export(params *ExportParams) ([]byte, *ImageMetadata, error)

Export exports the image

func (*ImageRef) ExtractArea 

func (r *ImageRef) ExtractArea(left, top, width, height int) error

ExtractArea executes the 'extract_area' operation

func (*ImageRef) ExtractBand 

func (r *ImageRef) ExtractBand(band int, num int) error

ExtractBand executes the 'extract_band' operation

func (*ImageRef) Flatten 

func (r *ImageRef) Flatten(backgroundColor *Color) error

Flatten executes the 'flatten' operation

func (*ImageRef) Flip 

func (r *ImageRef) Flip(direction Direction) error

Flip executes the 'flip' operation

func (*ImageRef) Format 

func (r *ImageRef) Format() ImageType

Format returns the initial format of the vips image when loaded

func (*ImageRef) GaussianBlur 

func (r *ImageRef) GaussianBlur(sigma float64) error

Gaussblur executes the 'gaussblur' operation

func (*ImageRef) GetOrientation 

func (r *ImageRef) GetOrientation() int

Return the orientation number as appears in the EXIF, if present

func (*ImageRef) HasAlpha 

func (r *ImageRef) HasAlpha() bool

HasAlpha returns if the image has an alpha layer.

func (*ImageRef) HasICCProfile 

func (r *ImageRef) HasICCProfile() bool

alias to HasProfile()

func (*ImageRef) HasIPTC 

func (r *ImageRef) HasIPTC() bool

func (*ImageRef) HasProfile 

func (r *ImageRef) HasProfile() bool

HasProfile returns if the image has an ICC profile embedded.

func (*ImageRef) Height 

func (r *ImageRef) Height() int

Height returns the height of this iamge

func (*ImageRef) Interpretation 

func (r *ImageRef) Interpretation() Interpretation

Interpretation returns the current interpretation

func (*ImageRef) Invert 

func (r *ImageRef) Invert() error

Invert executes the 'invert' operation

func (*ImageRef) IsColorSpaceSupported 

func (r *ImageRef) IsColorSpaceSupported() bool

func (*ImageRef) Label 

func (r *ImageRef) Label(labelParams *LabelParams) error

Label executes the 'label' operation

func (*ImageRef) Linear 

func (r *ImageRef) Linear(a, b []float64) error

func (*ImageRef) Linear1 

func (r *ImageRef) Linear1(a, b float64) error

func (*ImageRef) Metadata 

func (r *ImageRef) Metadata() *ImageMetadata

func (*ImageRef) Modulate 

func (r *ImageRef) Modulate(brightness, saturation, hue float64) error

Modulate the colors

func (*ImageRef) ModulateHSV 

func (r *ImageRef) ModulateHSV(brightness, saturation float64, hue int) error

Modulate the colors

func (*ImageRef) OffsetX 

func (r *ImageRef) OffsetX() int

OffsetX returns the X offset

func (*ImageRef) OffsetY 

func (r *ImageRef) OffsetY() int

OffsetY returns the Y offset

func (*ImageRef) OptimizeICCProfile 

func (r *ImageRef) OptimizeICCProfile() error

func (*ImageRef) PremultiplyAlpha 

func (r *ImageRef) PremultiplyAlpha() error

func (*ImageRef) RemoveICCProfile 

func (r *ImageRef) RemoveICCProfile() error

func (*ImageRef) RemoveMetadata 

func (r *ImageRef) RemoveMetadata() error

won't remove the ICC profile and orientation because we must have them to correctly display the image

func (*ImageRef) RemoveOrientation 

func (r *ImageRef) RemoveOrientation() error

func (*ImageRef) ResX 

func (r *ImageRef) ResX() float64

ResX returns the X resolution

func (*ImageRef) ResY 

func (r *ImageRef) ResY() float64

ResY returns the Y resolution

func (*ImageRef) Resize 

func (r *ImageRef) Resize(scale float64, kernel Kernel) error

Resize executes the 'resize' operation

func (*ImageRef) ResizeWithVScale 

func (r *ImageRef) ResizeWithVScale(hScale, vScale float64, kernel Kernel) error

func (*ImageRef) Rotate 

func (r *ImageRef) Rotate(angle Angle) error

Rotate executes the 'rot' operation

func (*ImageRef) SetOrientation 

func (r *ImageRef) SetOrientation(orientation int) error

func (*ImageRef) Sharpen 

func (r *ImageRef) Sharpen(sigma float64, x1 float64, m2 float64) error

Sharpen executes the 'sharpen' operation

func (*ImageRef) ToBytes 

func (r *ImageRef) ToBytes() ([]byte, error)

ToBytes writes the image to memory in VIPs format and returns the raw bytes, useful for storage.

func (*ImageRef) ToColorSpace 

func (r *ImageRef) ToColorSpace(interpretation Interpretation) error

func (*ImageRef) UnpremultiplyAlpha 

func (r *ImageRef) UnpremultiplyAlpha() error

func (*ImageRef) Width 

func (r *ImageRef) Width() int

Width returns the width of this image

func (*ImageRef) Zoom 

func (r *ImageRef) Zoom(xFactor int, yFactor int) error

Zoom executes the 'zoom' operation

type ImageType 

type ImageType int

ImageType represents an image type 

const (
	ImageTypeUnknown ImageType = C.UNKNOWN
	ImageTypeGIF     ImageType = C.GIF
	ImageTypeJPEG    ImageType = C.JPEG
	ImageTypeMagick  ImageType = C.MAGICK
	ImageTypePDF     ImageType = C.PDF
	ImageTypePNG     ImageType = C.PNG
	ImageTypeSVG     ImageType = C.SVG
	ImageTypeTIFF    ImageType = C.TIFF
	ImageTypeWEBP    ImageType = C.WEBP
	ImageTypeHEIF    ImageType = C.HEIF
	ImageTypeBMP     ImageType = C.BMP
)

ImageType enum

func DetermineImageType 

func DetermineImageType(buf []byte) ImageType

DetermineImageType attempts to determine the image type of the given buffer

func (ImageType) FileExt 

func (i ImageType) FileExt() string

FileExt returns the canonical extension for the ImageType

type Interpretation 

type Interpretation int

Interpretation represents VIPS_INTERPRETATION type 

const (
	InterpretationError     Interpretation = C.VIPS_INTERPRETATION_ERROR
	InterpretationMultiband Interpretation = C.VIPS_INTERPRETATION_MULTIBAND
	InterpretationBW        Interpretation = C.VIPS_INTERPRETATION_B_W
	InterpretationHistogram Interpretation = C.VIPS_INTERPRETATION_HISTOGRAM
	InterpretationXYZ       Interpretation = C.VIPS_INTERPRETATION_XYZ
	InterpretationLAB       Interpretation = C.VIPS_INTERPRETATION_LAB
	InterpretationCMYK      Interpretation = C.VIPS_INTERPRETATION_CMYK
	InterpretationLABQ      Interpretation = C.VIPS_INTERPRETATION_LABQ
	InterpretationRGB       Interpretation = C.VIPS_INTERPRETATION_RGB
	InterpretationRGB16     Interpretation = C.VIPS_INTERPRETATION_RGB16
	InterpretationCMC       Interpretation = C.VIPS_INTERPRETATION_CMC
	InterpretationLCH       Interpretation = C.VIPS_INTERPRETATION_LCH
	InterpretationLABS      Interpretation = C.VIPS_INTERPRETATION_LABS
	InterpretationSRGB      Interpretation = C.VIPS_INTERPRETATION_sRGB
	InterpretationYXY       Interpretation = C.VIPS_INTERPRETATION_YXY
	InterpretationFourier   Interpretation = C.VIPS_INTERPRETATION_FOURIER
	InterpretationGB16      Interpretation = C.VIPS_INTERPRETATION_RGB16
	InterpretationGrey16    Interpretation = C.VIPS_INTERPRETATION_GREY16
	InterpretationMatrix    Interpretation = C.VIPS_INTERPRETATION_MATRIX
	InterpretationScRGB     Interpretation = C.VIPS_INTERPRETATION_scRGB
	InterpretationHSV       Interpretation = C.VIPS_INTERPRETATION_HSV
)

Interpretation enum

type Kernel 

type Kernel int

Kernel represents VipsKernel type 

const (
	KernelAuto     Kernel = -1
	KernelNearest  Kernel = C.VIPS_KERNEL_NEAREST
	KernelLinear   Kernel = C.VIPS_KERNEL_LINEAR
	KernelCubic    Kernel = C.VIPS_KERNEL_CUBIC
	KernelLanczos2 Kernel = C.VIPS_KERNEL_LANCZOS2
	KernelLanczos3 Kernel = C.VIPS_KERNEL_LANCZOS3
	KernelMitchell Kernel = C.VIPS_KERNEL_MITCHELL
)

Kernel enum

type LabelParams 

type LabelParams struct {
	Text      string
	Font      string
	Width     Scalar
	Height    Scalar
	OffsetX   Scalar
	OffsetY   Scalar
	Opacity   float32
	Color     Color
	Alignment Align
}

LabelParams represents a text-based label

type MemoryStats 

type MemoryStats struct {
	Mem     int64
	MemHigh int64
	Files   int64
	Allocs  int64
}

type PreMultiplicationState 

type PreMultiplicationState struct {
	// contains filtered or unexported fields
}

type RuntimeStats 

type RuntimeStats struct {
	OperationCounts map[string]int64
}

type Scalar 

type Scalar struct {
	Value    float64
	Relative bool
}

func ValueOf 

func ValueOf(value float64) Scalar

func (*Scalar) Get 

func (s *Scalar) Get(base int) float64

func (*Scalar) GetRounded 

func (s *Scalar) GetRounded(base int) int

func (*Scalar) IsZero 

func (s *Scalar) IsZero() bool

func (*Scalar) Set 

func (s *Scalar) Set(value float64)

func (*Scalar) SetInt 

func (s *Scalar) SetInt(value int)

func (*Scalar) SetScale 

func (s *Scalar) SetScale(f float64)

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