images

package
v0.110.1 Latest Latest
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This package is not in the latest version of its module.

 Go to latest Published: Sep 16, 2022 License: MPL-2.0 Imports: 22 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	MaxJpegQuality = 80
	MinJpegQuality = 50

	SmallDim = ResizeDimension(80)
	LargeDim = ResizeDimension(240)

	BannerDim = ResizeDimension(800)

	SmallDimName = "thumbnail"
	LargeDimName = "large"

	BannerIdentityName = "banner"
)

Variables

View Source 
var (
	// ResizeDimensions list of all available image resize sizes
	ResizeDimensions = []ResizeDimension{SmallDim, LargeDim}

	// DimensionSizeLimit the size limits imposed on each resize dimension
	// Figures are based on the following sample data https://github.com/status-im/status-mobile/issues/11047#issuecomment-694970473
	DimensionSizeLimit = map[ResizeDimension]FileSizeLimits{
		SmallDim: {
			Ideal: 2560,
			Max:   5632,
		},
		LargeDim: {
			Ideal: 16384,
			Max:   38400,
		},
	}

	// ResizeDimensionToName maps a ResizeDimension to its assigned string name
	ResizeDimensionToName = map[ResizeDimension]string{
		SmallDim: SmallDimName,
		LargeDim: LargeDimName,
	}

	// NameToResizeDimension maps a string name to its assigned ResizeDimension
	NameToResizeDimension = map[string]ResizeDimension{
		SmallDimName: SmallDim,
		LargeDimName: LargeDim,
	}
)

Functions

func CompressToFileLimits added in v0.108.2 

func CompressToFileLimits(bb *bytes.Buffer, img image.Image, bounds FileSizeLimits) error

CompressToFileLimits takes an image.Image and analyses the pixel dimensions, if the longest side is greater than the `longSideMax` image.Image will be resized, before compression begins. Next the image.Image is repeatedly encoded and resized until the data fits within the given FileSizeLimits. There is no limit on the number of times the cycle is performed, the image.Image is reduced to 95% of its size at the end of every round the file size exceeds the given limits.

func Crop 

func Crop(img image.Image, rect image.Rectangle) (image.Image, error)

func CropCenter added in v0.87.2 

func CropCenter(img image.Image) (image.Image, error)

CropCenter takes an image, usually downloaded from a URL If the image is square, the full image is returned If the image is rectangular, the largest central square is returned calculations at _docs/image-center-crop-calculations.png

func Decode 

func Decode(fileName string) (image.Image, error)

func DecodeFromURL added in v0.87.2 

func DecodeFromURL(path string) (image.Image, error)

func Encode 

func Encode(w io.Writer, img image.Image, config EncodeConfig) error

func EncodeToBestSize 

func EncodeToBestSize(bb *bytes.Buffer, img image.Image, size ResizeDimension) error

func EncodeToLimits added in v0.100.0 

func EncodeToLimits(bb *bytes.Buffer, img image.Image, bounds FileSizeLimits) error

func GetMimeType 

func GetMimeType(buf []byte) (string, error)

func GetPayloadDataURI 

func GetPayloadDataURI(payload []byte) (string, error)

func GetPayloadFromURI added in v0.108.2 

func GetPayloadFromURI(uri string) ([]byte, error)

func Resize 

func Resize(size ResizeDimension, img image.Image) image.Image

func ResizeTo added in v0.108.2 

func ResizeTo(percent int, img image.Image) image.Image

func ShrinkOnly added in v0.100.0 

func ShrinkOnly(size ResizeDimension, img image.Image) image.Image

Types

type CroppedImage added in v0.100.0 

type CroppedImage struct {
	ImagePath string `json:"imagePath"`
	X         int    `json:"x"`
	Y         int    `json:"y"`
	Width     int    `json:"width"`
	Height    int    `json:"height"`
}

type EncodeConfig 

type EncodeConfig struct {
	Quality int
}

type FileSizeError added in v0.108.2 

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

func (*FileSizeError) Error added in v0.108.2 

func (e *FileSizeError) Error() string

type FileSizeLimits added in v0.108.2 

type FileSizeLimits struct {
	Ideal int
	Max   int
}

func GetBannerDimensionLimits added in v0.100.0 

func GetBannerDimensionLimits() FileSizeLimits

type IdentityImage 

type IdentityImage struct {
	KeyUID       string `json:"keyUID"`
	Name         string `json:"name"`
	Payload      []byte `json:"payload"`
	Width        int    `json:"width"`
	Height       int    `json:"height"`
	FileSize     int    `json:"fileSize"`
	ResizeTarget int    `json:"resizeTarget"`
	Clock        uint64 `json:"clock"`
}

func GenerateBannerImage added in v0.100.0 

func GenerateBannerImage(filepath string, aX, aY, bX, bY int) (*IdentityImage, error)

func GenerateIdentityImages 

func GenerateIdentityImages(filepath string, aX, aY, bX, bY int) ([]IdentityImage, error)

func GenerateIdentityImagesFromURL added in v0.87.2 

func GenerateIdentityImagesFromURL(url string) ([]IdentityImage, error)

func GenerateImageVariants added in v0.87.2 

func GenerateImageVariants(cImg image.Image) ([]IdentityImage, error)

func SampleIdentityImages 

func SampleIdentityImages() []IdentityImage

func (*IdentityImage) FromProtobuf added in v0.106.1 

func (i *IdentityImage) FromProtobuf(ii *protobuf.MultiAccount_IdentityImage)

func (IdentityImage) GetDataURI 

func (i IdentityImage) GetDataURI() (string, error)

func (IdentityImage) GetType 

func (i IdentityImage) GetType() (ImageType, error)

func (IdentityImage) Hash 

func (i IdentityImage) Hash() []byte

func (IdentityImage) IsEmpty added in v0.106.1 

func (i IdentityImage) IsEmpty() bool

func (IdentityImage) MarshalJSON 

func (i IdentityImage) MarshalJSON() ([]byte, error)

func (*IdentityImage) ToProtobuf added in v0.106.1 

func (i *IdentityImage) ToProtobuf() *protobuf.MultiAccount_IdentityImage

type ImageType 

type ImageType uint
const (
	UNKNOWN ImageType = 1 + iota

	// Raster image types
	JPEG
	PNG
	GIF
	WEBP
)

func GetType 

func GetType(buf []byte) ImageType

type ResizeDimension 

type ResizeDimension uint

Source Files

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