pack

package
v1.1.1 Latest Latest
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 Go to latest Published: Apr 14, 2025 License: MIT Imports: 24 Imported by: 0

Documentation

Overview

Package pack provides texture packing utilities, including support for rotation, transparent pixel trimming, automatic resizing and so on.

Supported input image formats include PNG, JPEG, TIFF, BMP, and WEBP. Supported output formats are PNG, JPEG, TIFF, and BMP.

Index

Constants

View Source 
const (
	Version = "0.0.1"
	Repo    = "https://github.com/91xusir/spritepacker"
	Format  = "RGBA8888"
)
View Source 
const (
	NoCompression      clv = 0 // No compression
	BestSpeed          clv = 1 // Best speed
	DefaultCompression clv = 2 // Default compression
	BestCompression    clv = 3 // Best compression
)

Variables

This section is empty.

Functions

func DecImg 

func DecImg(r io.Reader) (image.Image, error)

DecImg Supported formats:

  • JPEG
  • PNG
  • TIFF
  • BMP
  • WEBP

func EncImg 

func EncImg(w io.Writer, img image.Image, format ImageFormat, compressionLevel ...SetClv) error

EncImg encodes the image to the specified format and writes it to the writer. Parameters:

  • w: the writer to write the encoded image
  • img: the image to encode
  • format: the image format to encode
  • compressionLevel: the compression level to use, default is NoCompression

Returns:

  • error: an error if the format is unsupported or if encoding fails

Supported formats:

  • JPEG
  • PNG
  • TIFF
  • BMP

func GetLastFolderName 

func GetLastFolderName(path string) string

GetLastFolderName

Parameters:

  • path: the path

Returns:

  • string: the last folder name

Example: 

folderName := GetLastFolderName("./sprites/atlas/a.png")
// folderName = "atlas"

func GetOpaqueBounds 

func GetOpaqueBounds(img image.Image, tolerance uint8) image.Rectangle

GetOpaqueBounds returns the bounds of the opaque area of the image. The image is assumed to be in RGBA format.

func ListFilePaths 

func ListFilePaths(dirPath string) ([]string, error)

ListFilePaths

Parameters:

  • dirPath: the directory path

Returns:

  • []string: the file paths
  • error: the error

Example: 

filePaths, err := ListFilePaths("./sprites")

func LoadImg 

func LoadImg(pathName string) (image.Image, error)

func MaxInt 

func MaxInt(a, b int) int

MaxInt returns the larger of a and b.

func MinInt 

func MinInt(a, b int) int

MinInt returns the smaller of a and b.

func NaturalLess 

func NaturalLess(a, b string) bool

func NaturalSort 

func NaturalSort(items []string)

NaturalSort sorts the items in natural order.

func NextPowerOfTwo 

func NextPowerOfTwo(n int) int

NextPowerOfTwo returns the next power of two of n.

func Parallel 

func Parallel(start, stop int, fn func(<-chan int))

Parallel processes the data in separate goroutines.

func Rotate90 

func Rotate90(img image.Image) *image.NRGBA

Rotate90 rotates the image 90 degrees counter-clockwise and returns the transformed image.

func Rotate180 

func Rotate180(img image.Image) *image.NRGBA

Rotate180 rotates the image 180 degrees counter-clockwise and returns the transformed image.

func Rotate270 

func Rotate270(img image.Image) *image.NRGBA

Rotate270 rotates the image 270 degrees counter-clockwise and returns the transformed image.

func SafeCreate 

func SafeCreate(outputPath string) (*os.File, error)

func SaveImgAutoExt 

func SaveImgAutoExt(pathNoneExt string, img image.Image, format ImageFormat, compressionLevel ...SetClv) error

func SaveImgByExt 

func SaveImgByExt(outputPath string, img image.Image, compressionLevel ...SetClv) error

func UnpackSprites 

func UnpackSprites(jsonPath string, fn ...UnpackOpts) error

Types

type Algorithm 

type Algorithm int

Algorithm defines the packing algorithm used. 

const (
	AlgoBasic Algorithm = iota
	AlgoSkyline
	AlgoMaxRects
	MaxAlgoIndex
)

type Atlas 

type Atlas struct {
	Name    string   `json:"name"`
	Size    Size     `json:"size"`
	Sprites []Sprite `json:"sprites"`
}

type Bin 

type Bin struct {
	Size
	PackedRects []Rect
	UsedArea    int
}

Bin represents a Bin with a width, height,and a list of rectangles have been packed.

func NewBin 

func NewBin(w, h int, req []Rect) Bin

NewBin creates a new bin with the given width, height, and list of rectangles to be packed.

func (Bin) FillRate 

func (b Bin) FillRate() float64

func (Bin) String 

func (b Bin) String() string

type Heuristic 

type Heuristic int

Heuristic defines the heuristic used by the MaxRects algorithm. 

const (
	BestShortSideFit Heuristic = iota
	BestLongSideFit
	BestAreaFit
	BottomLeftFit
	ContactPointFit
	MaxHeuristicsIndex
)

type ImageFormat 

type ImageFormat int
const (
	JPEG ImageFormat = iota
	PNG
	TIFF
	BMP
	WEBP
)

type Meta 

type Meta struct {
	Repo      string `json:"repo"`
	Format    string `json:"format"`
	Version   string `json:"version"`
	Timestamp string `json:"timestamp"`
}

type Options 

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

func NewOptions 

func NewOptions() *Options

func (*Options) Algorithm 

func (b *Options) Algorithm(algo Algorithm) *Options

Algorithm sets the packing algorithm of the atlas. If the algorithm is not valid, it will be set to AlgoBasic.

func (*Options) AllowRotate 

func (b *Options) AllowRotate(enable bool) *Options

AllowRotate allow sprites to Rotate to optimizeAtlasSize

func (*Options) AutoSize 

func (b *Options) AutoSize(enable bool) *Options

AutoSize atlas size will be automatically adjusted.

func (*Options) Heuristic 

func (b *Options) Heuristic(heuristic Heuristic) *Options

Heuristic sets the heuristic of the atlas. If the heuristic is not valid, it will be set to BestShortSideFit. It is valid only when the algorithm is AlgoMaxRects.

func (*Options) MaxSize 

func (b *Options) MaxSize(w, h int) *Options

MaxSize sets the maximum size of the atlas. If the width or height is less than or equal to 0, it will be set to 512.

func (*Options) Name 

func (b *Options) Name(name string) *Options

Name sets the name of the atlas. If the name is empty, the default name is "atlas".

func (*Options) Padding 

func (b *Options) Padding(padding int) *Options

Padding sets the padding of the atlas. If the padding is less than 0, it will be set to 0.

func (*Options) PowerOfTwo 

func (b *Options) PowerOfTwo(enable bool) *Options

PowerOfTwo sets the power of two of the atlas. The atlas pixels are fixed to a power of 2.

func (*Options) SameDetect 

func (b *Options) SameDetect(enable bool) *Options

SameDetect sets the same detection of the atlas.

func (*Options) Sort 

func (b *Options) Sort(enable bool) *Options

Sort sets the sorting of the atlas. default method is sort by area.

func (*Options) Tolerance 

func (b *Options) Tolerance(tolerance int) *Options

Tolerance sets the tolerance of trimming transparency pixels.

func (*Options) Trim 

func (b *Options) Trim(enable bool) *Options

Trim transparent pixels will be trimmed from the image.

func (*Options) Validate 

func (b *Options) Validate() (*Options, error)

Validate validates the options. If the options are invalid, it will return an error.

type Packer 

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

func NewPacker 

func NewPacker(option *Options) *Packer

func (*Packer) PackRect 

func (p *Packer) PackRect(reqRects []Rect) []Bin

PackRect packs the given rectangles into a bin and returns the result.

func (*Packer) PackSprites 

func (p *Packer) PackSprites(input string) (*SpriteAtlas, []image.Image, error)

PackSprites packs the given sprite images

Parameters:

  • spritePaths: the paths of the sprite images

Returns:

  • *SpriteAtlas: the sprite atlas info
  • []image.Image: the atlas images
  • error

Example: 

spriteAtlas, atlasImages, err := packer.PackSprites("./input")

type Point 

type Point struct {
	X int `json:"x"`
	Y int `json:"y"`
}

func NewPoint 

func NewPoint(x, y int) Point

type Rect 

type Rect struct {
	Point
	Size
	Id        int  `json:"-"`
	IsRotated bool `json:"rotated,omitempty"`
}

Rect represents an immutable rectangle using value semantics.

func NewRect 

func NewRect(x, y, w, h, id int) Rect

NewRect creates a new Rect value.

func NewRectByPosAndSize 

func NewRectByPosAndSize(x, y, w, h int) Rect

func NewRectBySize 

func NewRectBySize(w, h int) Rect

func NewRectBySizeAndId 

func NewRectBySizeAndId(w, h, id int) Rect

func (Rect) Clone 

func (r Rect) Clone() Rect

func (Rect) CloneWithPos 

func (r Rect) CloneWithPos(x, y int) Rect

func (Rect) CloneWithSize 

func (r Rect) CloneWithSize(w, h int) Rect

func (Rect) Rotated 

func (r Rect) Rotated() Rect

func (Rect) String 

func (r Rect) String() string

func (Rect) ToImageRect 

func (r Rect) ToImageRect() image.Rectangle

type SameDetectInfo 

type SameDetectInfo struct {
	DupeToBaseName  map[string]string
	BaseToDupesName map[string][]string
}

func FindDuplicateFiles 

func FindDuplicateFiles(filePaths []string) ([]string, SameDetectInfo, error)

FindDuplicateFiles finds duplicate files in the given file paths.

Parameters:

  • filePaths: the paths of the files to be checked

Returns:

  • []string: the paths of the unique files
  • map[string]string: the map of duplicate file names and their corresponding base names
  • map[string][]string: the map of base file names to their duplicate file names
  • error

type SetClv 

type SetClv func(*encodeImgOpt)

func WithCLV 

func WithCLV(clv clv) SetClv

WithCLV sets the compression level for the image.

type Size 

type Size struct {
	W int `json:"w"`
	H int `json:"h"`
}

Size represents a size with width and height. The width and height must be positive.

func NewSize 

func NewSize(w, h int) Size

func (Size) Area 

func (s Size) Area() int

func (Size) Clone 

func (s Size) Clone() Size

func (Size) PowerOfTwo 

func (s Size) PowerOfTwo() Size

func (Size) Rotated 

func (s Size) Rotated() Size

type Sprite 

type Sprite struct {
	FileName    string `json:"filename"`
	Frame       Rect   `json:"frame"`
	SrcRect     Size   `json:"srcRect"`
	TrimmedRect Rect   `json:"trimmedRect,omitzero"`
	Rotated     bool   `json:"rotated"`
	Trimmed     bool   `json:"trimmed"`
}

func (Sprite) Clone 

func (s Sprite) Clone() Sprite

type SpriteAtlas 

type SpriteAtlas struct {
	Meta    Meta    `json:"meta"`
	Atlases []Atlas `json:"atlases"`
}

type UnpackOpts 

type UnpackOpts func(*unpackedOpts)

func WithImg 

func WithImg(atlasImgPath string) UnpackOpts

func WithOutput 

func WithOutput(outputPath string) UnpackOpts

Source Files

View all Source files

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