imageutil

package
v1.3.5 Latest Latest
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 Go to latest Published: Nov 27, 2020 License: MIT Imports: 18 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	FileExtensionWebp = ".webp"

	FormatNameJPG  = "jpeg"
	FormatNamePNG  = "png"
	FormatNameWEBP = "webp"
)
View Source 
const (
	JPEGQualityDefault int = 80
	JPEGQualityMax     int = 100
)

Variables

This section is empty.

Functions

func AddBackgroundColor added in v1.2.0 

func AddBackgroundColor(imgSrc image.Image, clr color.Color) image.Image

AddBackgroundColor adds a background of `color.Color` to an image. It is is useful when the image has a transparent background. Use `colornames` for more colors, e.g. `colornames.Blue`.

func AddBackgroundWhite 

func AddBackgroundWhite(imgSrc image.Image) image.Image

AddBackgroundWhite adds a white background which is usable when the image has a transparent background.

func Aspect 

func Aspect(width, height int) float64

func DecodeWebpRGBA added in v1.3.1 

func DecodeWebpRGBA(r io.Reader) (image.Image, string, error)

func ImageAnyToRGBA added in v1.2.0 

func ImageAnyToRGBA(src image.Image) *image.RGBA

func ImageAspect 

func ImageAspect(img image.Image) float64

func ImageToRGBA added in v1.1.0 

func ImageToRGBA(img image.Image) *image.RGBA

func ImageWithSetToRGBA added in v1.2.0 

func ImageWithSetToRGBA(src ImageWithSet) *image.RGBA

func IsImageExt 

func IsImageExt(imagePath string) bool

func IsNilOrEmpty added in v1.3.0 

func IsNilOrEmpty(img image.Image) bool

func MergeHorizontalRGBA 

func MergeHorizontalRGBA(ims ImageMetaSet) image.Image

MergeHorizontalRGBA returns an image that is composed of non-overlapping imagers in ImageMetaSet. The code here is adapted from https://stackoverflow.com/a/35965499/1908967

func MergeXSameY added in v1.3.0 

func MergeXSameY(images []image.Image, larger bool) image.Image

func MergeXSameYRead added in v1.3.0 

func MergeXSameYRead(locations []string, larger bool) (image.Image, error)

func MergeYSameX added in v1.3.0 

func MergeYSameX(images []image.Image, larger bool) image.Image

func MergeYSameXRead added in v1.3.0 

func MergeYSameXRead(locations []string, larger bool) (image.Image, error)

func NRGBAtoRGBA added in v1.1.0 

func NRGBAtoRGBA(imgNRGBA *image.NRGBA) *image.RGBA

func NegativeOffset added in v1.1.0 

func NegativeOffset(width, height, offset uint) image.Point

func NewRGBAColor added in v1.3.0 

func NewRGBAColor(rect image.Rectangle, clr color.RGBA) *image.RGBA

func NewRGBATransparent added in v1.3.0 

func NewRGBATransparent(rect image.Rectangle) *image.RGBA

func NewRGBAWhite added in v1.3.0 

func NewRGBAWhite(rect image.Rectangle) *image.RGBA

func OverlayCenterYLeftAlign 

func OverlayCenterYLeftAlign(imgBg, imgOver image.Image) image.Image

func PaintBorderRGBA added in v1.1.0 

func PaintBorderRGBA(img *image.RGBA, clr color.RGBA, width uint)

func PaintColorRGBA added in v1.1.0 

func PaintColorRGBA(img *image.RGBA, clr color.RGBA)

func PaintColorRGBARectangle added in v1.1.0 

func PaintColorRGBARectangle(img *image.RGBA, clr color.RGBA, rectNew image.Rectangle)

func ParseScaler added in v1.1.0 

func ParseScaler(rawInterpolation string) (draw.Scaler, error)

func ReadImageAny added in v1.1.0 

func ReadImageAny(location string) (image.Image, string, error)

func ReadImageDimensions 

func ReadImageDimensions(imagePath string) (int, int, error)

func ReadImageFile added in v1.1.0 

func ReadImageFile(filename string) (image.Image, string, error)

func ReadImageHttp added in v1.1.0 

func ReadImageHttp(imageUrl string) (image.Image, string, error)

func ReadImages added in v1.3.0 

func ReadImages(locations []string) ([]image.Image, error)

func RectangleBorderXMax added in v1.1.0 

func RectangleBorderXMax(rect image.Rectangle, pixels uint) image.Rectangle

func RectangleBorderXMin added in v1.1.0 

func RectangleBorderXMin(rect image.Rectangle, pixels uint) image.Rectangle

func RectangleBorderYMax added in v1.1.0 

func RectangleBorderYMax(rect image.Rectangle, pixels uint) image.Rectangle

func RectangleBorderYMin added in v1.1.0 

func RectangleBorderYMin(rect image.Rectangle, pixels uint) image.Rectangle

func Resize 

func Resize(width, height uint, src image.Image, scale draw.Scaler) image.Image

Resize scales an image to the provided size units. Use a 0 to scale the aspect ratio. See gitub.com/nfnt/resize for Lanczos3, etc. https://github.com/nfnt/resize .

func ResizeMaxDimension added in v1.1.0 

func ResizeMaxDimension(maxSide uint, src image.Image, scale draw.Scaler) image.Image

func ResizeSameX added in v1.3.0 

func ResizeSameX(images []image.Image, larger bool) []image.Image

func ResizeSameY added in v1.3.0 

func ResizeSameY(images []image.Image, larger bool) []image.Image

func Scale 

func Scale(src image.Image, rect image.Rectangle, scale draw.Scaler) image.Image

Scale will resize the image to the provided rectangle using the provided interpolation function.

func ScalerBest added in v1.1.0 

func ScalerBest() draw.Scaler

func ScalerDefault added in v1.1.0 

func ScalerDefault() draw.Scaler

func SliceXY added in v1.3.0 

func SliceXY(images []image.Image, maxIdx int) (minX, maxX, minY, maxY, sumX, sumY int)

func Square added in v1.1.0 

func Square(src image.Image) image.Image

func WriteFileJPEG 

func WriteFileJPEG(filename string, img image.Image, quality int) error

func WriteFilePNG 

func WriteFilePNG(filename string, img image.Image) error

func WriteFileWEBP added in v1.3.1 

func WriteFileWEBP(filename string, img image.Image, lossless bool, perm os.FileMode) error

func YCbCrToRGBA added in v1.1.0 

func YCbCrToRGBA(src *image.YCbCr) *image.RGBA

Types

type ImageMeta 

type ImageMeta struct {
	File       *os.File
	FormatName string
	Image      image.Image
}

type ImageMetaSet 

type ImageMetaSet struct {
	ImageMetas []ImageMeta
}

func NewImageSetFiles 

func NewImageSetFiles(filenames []string) (ImageMetaSet, error)

func (*ImageMetaSet) CloseFilesAll 

func (ims *ImageMetaSet) CloseFilesAll() error

func (*ImageMetaSet) MaxX 

func (ims *ImageMetaSet) MaxX() int

func (*ImageMetaSet) MaxY 

func (ims *ImageMetaSet) MaxY() int

func (*ImageMetaSet) Stats 

func (ims *ImageMetaSet) Stats() ImageStatsMulti

func (*ImageMetaSet) SumX 

func (ims *ImageMetaSet) SumX(maxIndexInclusive int) int

func (*ImageMetaSet) SumY 

func (ims *ImageMetaSet) SumY(maxIndexInclusive int) int

type ImageStatsMulti 

type ImageStatsMulti struct {
	MaxX int
	SumX int
	MaxY int
	SumY int
}

type ImageWithSet added in v1.2.0 

type ImageWithSet interface {
	// ColorModel returns the Image's color model.
	ColorModel() color.Model
	// Bounds returns the domain for which At can return non-zero color.
	// The bounds do not necessarily contain the point (0, 0).
	Bounds() image.Rectangle
	// At returns the color of the pixel at (x, y).
	// At(Bounds().Min.X, Bounds().Min.Y) returns the upper-left pixel of the grid.
	// At(Bounds().Max.X-1, Bounds().Max.Y-1) returns the lower-right one.
	At(x, y int) color.Color
	Set(x, y int, c color.Color)
}

type Matrix added in v1.3.1 

type Matrix [][]image.Image

func MatrixRead added in v1.3.1 

func MatrixRead(imglocations [][]string) (Matrix, error)

func (Matrix) AddBackgroundColor added in v1.3.1 

func (matrix Matrix) AddBackgroundColor(clr color.Color)

AddBackgroundColor adds a background of `color.Color` to the images. It is is useful when the image has a transparent background. Use `colornames` for more colors, e.g. `colornames.Blue`.

func (Matrix) AddBackgroundColorHex added in v1.3.1 

func (matrix Matrix) AddBackgroundColorHex(hexcolor string) error

func (Matrix) Merge added in v1.3.1 

func (matrix Matrix) Merge(largerX, largerY bool) image.Image

Merge combines a set of images resizing each row element's height for consistent rows, an each row's width for consistent widths.

Source Files

View all Source files

Directories

Path Synopsis
examples
merge_matrix
resize_and_overlay

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