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palettepull.go
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/
palettepull.go
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package main
import (
"fmt"
"github.com/zedseven/coloursorting"
"image"
"image/color"
"image/draw"
_ "image/gif"
_ "image/jpeg"
"image/png"
"math"
"os"
"path/filepath"
"sort"
"strings"
)
const (
bitsPerByte = 8
targetChannels = 3
)
type fmtInfo struct {
Model color.Model
ChannelsPerPix int
BitsPerChannel int
AlphaChannel int
}
func main() {
if len(os.Args) < 2 {
fmt.Println("You have to specify a srcPath to a directory.")
return
}
srcPath := os.Args[1]
palette := make(map[uint]struct{})
var id bool
var err error
if id, err = isDir(srcPath); err != nil {
fmt.Println("The provided srcPath does not exist.")
return
} else if id {
if err := filepath.Walk(srcPath, func(p string, i os.FileInfo, e error) error {
if id, err := isDir(p); err == nil && !id {
return collectColours(&palette, p)
} else if err != nil {
return err
}
return nil
}); err != nil {
fmt.Println("An error occurred while working on the srcPath.", err.Error())
return
}
} else {
if err := collectColours(&palette, srcPath); err != nil {
fmt.Println("An error occurred while working on the srcPath.", err.Error())
return
}
}
paletteColours := make([][3]int, 0, len(palette))
for k := range palette {
paletteColours = append(paletteColours, colourToArr(k))
}
//fmt.Println(paletteColours)
sort.Sort(coloursorting.StepSort(paletteColours))
//fmt.Println(paletteColours)
srcBase := filepath.Base(srcPath)
if !id {
srcBase = strings.TrimSuffix(srcBase, filepath.Ext(srcBase))
}
if strings.Contains(srcBase, " ") {
srcBase += " "
}
paletteImgPath := filepath.Join(filepath.Dir(srcPath), srcBase + "Palette.png")
newFile, err := os.OpenFile(paletteImgPath, os.O_RDWR | os.O_CREATE, os.ModePerm)
if err != nil {
fmt.Println("An error occurred while creating \"" + paletteImgPath + "\":", err.Error())
return
}
defer func() {
if err := newFile.Close(); err != nil {
fmt.Println("An error occurred while writing \"" + paletteImgPath + "\":", err.Error())
}
}()
if len(paletteColours) <= 0 {
fmt.Println("No colours could be found.")
return
}
if err := png.Encode(newFile, paletteToImg(paletteColours)); err != nil {
fmt.Println("An error occurred while writing image data to \"" + paletteImgPath + "\":", err.Error())
return
}
fmt.Println("Done! The palette image was written to \"" + paletteImgPath + "\".")
}
func isDir(path string) (bool, error) {
info, err := os.Stat(path)
if os.IsNotExist(err) {
return false, err
}
return info.IsDir(), nil
}
func getImgData(img image.Image) (info fmtInfo, channels []uint8) {
switch img.(type) {
case *image.RGBA:
info = fmtInfo{color.RGBAModel, 4, 8, 3}
simg := img.(*image.RGBA)
channels = simg.Pix
case *image.RGBA64:
info = fmtInfo{color.RGBA64Model, 4, 16, 3}
simg := img.(*image.RGBA64)
channels = simg.Pix
case *image.NRGBA:
info = fmtInfo{color.NRGBAModel, 4, 8, 3}
simg := img.(*image.NRGBA)
channels = simg.Pix
case *image.NRGBA64:
info = fmtInfo{color.NRGBA64Model, 4, 16, 3}
simg := img.(*image.NRGBA64)
channels = simg.Pix
case *image.Gray:
info = fmtInfo{color.GrayModel, 1, 8, -1}
simg := img.(*image.Gray)
channels = simg.Pix
case *image.Gray16:
info = fmtInfo{color.Gray16Model, 1, 16, -1}
simg := img.(*image.Gray16)
channels = simg.Pix
case *image.Paletted:
info = fmtInfo{color.RGBAModel, 4, 8, 3}
simg := img.(*image.Paletted)
for _, v := range simg.Palette {
r, g, b, a := v.RGBA()
channels = append(channels, uint8(r))
channels = append(channels, uint8(g))
channels = append(channels, uint8(b))
channels = append(channels, uint8(a))
}
default:
info = fmtInfo{color.AlphaModel, 0, 0, -1}
}
return
}
func collectColours(palette *map[uint]struct{}, imgPath string) error {
imgFile, err := os.Open(imgPath)
if err != nil {
return err
}
img, _, err := image.Decode(imgFile)
if err == image.ErrFormat {
return nil
} else if err != nil {
return err
}
lclPalette := *palette
info, channels := getImgData(img)
//fmt.Println(info)
if info.ChannelsPerPix <= 0 {
return nil
}
for i := 0; i < len(channels) / info.ChannelsPerPix; i++ {
if info.AlphaChannel > -1 && channels[i * info.ChannelsPerPix + info.AlphaChannel] <= 0 {
continue
}
// Limits to maximum targetChannels channels, and repeats the last channel of the pixel to meet the target
pix := uint(0)
for c := 0; c < targetChannels; c++ {
pix <<= info.BitsPerChannel
v := c
if c >= info.ChannelsPerPix {
v = info.ChannelsPerPix - 1
}
pix |= uint(channels[i * info.ChannelsPerPix + v])
}
lclPalette[pix] = struct{}{}
}
*palette = lclPalette
return nil
}
func colourToHex(colour uint) string {
r := uint8(colour >> (2 * bitsPerByte))
g := uint8((colour >> bitsPerByte) & 0xff)
b := uint8(colour & 0xff)
//fmt.Printf("%024b | %d %d %d | %08b %08b %08b\n", colour, r, g, b, r, g, b)
return fmt.Sprintf("#%02X%02X%02X", r, g, b)
}
func colourToArr(colour uint) [3]int {
r := int(uint8(colour >> (2 * bitsPerByte)))
g := int(uint8((colour >> bitsPerByte) & 0xff))
b := int(uint8(colour & 0xff))
return [3]int{r, g, b}
}
func paletteToImg(palette [][3]int) image.Image {
paletteLen := len(palette)
outputWidth := int(math.Sqrt(float64(paletteLen)))
outputHeight := paletteLen / outputWidth
if paletteLen % outputWidth != 0 {
outputHeight += 1
}
img := image.NewRGBA(image.Rect(0, 0, outputWidth, outputHeight))
draw.Draw(img, img.Bounds(), &image.Uniform{color.Transparent}, image.Pt(0, 0), draw.Src)
for i := 0; i < paletteLen; i++ {
x := i % outputWidth
y := i / outputWidth
img.Set(x, y, color.RGBA{uint8(palette[i][0]), uint8(palette[i][1]), uint8(palette[i][2]), 255})
}
return img
}