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convert.go
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convert.go
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package main
import (
"fmt"
"image"
"image/gif"
"image/jpeg"
"image/png"
"io"
"os"
"path/filepath"
"github.com/blezek/tga"
"github.com/hhrutter/tiff"
pnm "github.com/jbuchbinder/gopnm"
"github.com/kevin-cantwell/dotmatrix"
"github.com/samuel/go-pcx/pcx"
"github.com/xyproto/xpm"
"golang.org/x/image/bmp"
"lelux.net/x/image/qoi"
"vimagination.zapto.org/limage/xcf"
megaSD "github.com/bodgit/megasd/image"
"github.com/chai2010/webp"
"github.com/leotaku/mobi/jfif"
)
// ValidOutputTypes
//
// A list of valid encoders by file type.
var ValidOutputTypes = []string{
"png", // std/image
"gif", // std/image
"jpeg", // std/image
"bmp", // golang.org/x/image
"tiff", // golang.org/x/image
"jfif", // github.com/leotaku/mobi/jfif
"webp", // github.com/chai2010/webp
"pbm", // github.com/jbuchbinder/gopnm
"pgm", // github.com/jbuchbinder/gopnm
"ppm", // github.com/jbuchbinder/gopnm
"pcx", // github.com/samuel/go-pcx/pcx
"megasd", // github.com/bodgit/megasd/image
"qoi", // lelux.net/x/image/qoi
"tga", // github.com/blezek/tga
"xpm", // github.com/xyproto/xpm
"xcf", // vimagination.zapto.org/limage/xcf
"dotmatrix.txt", // github.com/kevin-cantwell/dotmatrix
}
var genericExporters = map[string]func(io.Writer, image.Image) error{
"bmp": bmp.Encode,
"png": png.Encode,
"pcx": pcx.Encode,
"megasd": megaSD.Encode,
"qoi": qoi.Encode,
"tga": tga.Encode,
"xpm": xpm.Encode,
}
type QualityInformation struct {
Lossless bool
Quality int
WebpExact bool
TiffPredictor bool
}
func ConvertTo(filename string, outputFileType string, quality QualityInformation, overrideSameTypeSkip bool, overwriteFiles bool) (err error) {
fmt.Printf("starting %s\n", filename)
if (filepath.Ext(filename) == "."+outputFileType) && !overrideSameTypeSkip {
return fmt.Errorf("%s already output type, skipping", filename)
}
if _, err := os.Stat(filename + "." + outputFileType); err == nil && !overwriteFiles {
return fmt.Errorf("%s already exists, skipping", filename+"."+outputFileType)
}
imported, err := Import(filename)
if err != nil {
return fmt.Errorf("%s import failed, skipping (%s)", filename, err.Error())
}
r, err := os.Create(filename + "." + outputFileType)
if err != nil {
_ = r.Close()
return fmt.Errorf("%s.%s couldn't be created, skipping (%s)", filename, outputFileType, err.Error())
}
switch outputFileType {
case "tiff":
err = tiff.Encode(r, imported, &tiff.Options{
Compression: tiff.CompressionType(quality.Quality), Predictor: quality.TiffPredictor,
})
case "gif":
err = gif.Encode(r, imported, &gif.Options{NumColors: quality.Quality})
case "jpeg", "jpg":
err = jpeg.Encode(r, imported, &jpeg.Options{Quality: quality.Quality})
case "jfif":
err = jfif.Encode(r, imported, &jpeg.Options{Quality: quality.Quality})
case "webp":
err = webp.Encode(r, imported, &webp.Options{
Quality: float32(quality.Quality), Lossless: quality.Lossless, Exact: quality.WebpExact,
})
case "pbm":
err = pnm.Encode(r, imported, pnm.PBM)
case "pgm":
err = pnm.Encode(r, imported, pnm.PGM)
case "ppm":
err = pnm.Encode(r, imported, pnm.PPM)
case "xcf":
err = xcf.Encode(r, imported)
case "dotmatrix.txt":
err = (*dotmatrix.NewPrinter(r, &dotmatrix.Config{})).Print(imported)
_:
err = genericExporters[outputFileType](r, imported)
}
if err != nil {
_ = r.Close()
return fmt.Errorf("%s.%s couldn't be encoded (%s)", filename, outputFileType, err.Error())
}
_ = r.Close()
return nil
}