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m_utils.go
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/
m_utils.go
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package main
import (
"image"
"io"
"os"
"time"
"fyne.io/fyne/v2"
"github.com/disintegration/imaging"
"github.com/tajtiattila/metadata/exif"
)
const DefaultDisplayDateFormat = "02.01.2006 15:04:05"
const ListDateFormat = "2006.01.02 15:04:05"
const FileNameDateFormat = "20060102_150405"
// get photo properties (width, height, file size and date, exif date) from file
func (p *Photo) GetPhotoProperties(URI fyne.URI) error {
f, err := os.Open(URI.Path())
if err != nil {
return err
}
defer f.Close()
imgConfig, _, err := image.DecodeConfig(f)
if err == nil {
p.width = imgConfig.Width
p.height = imgConfig.Height
}
fi, err := f.Stat()
if err == nil {
p.Dates[UseFileDate] = fi.ModTime().Format(ListDateFormat)
p.byteSize = fi.Size()
}
// get EXIF metadata from file
f.Seek(0, io.SeekStart)
fileExif, err := exif.Decode(f)
if err == nil {
exifTime, ok := fileExif.DateTime()
if ok {
p.Dates[UseExifDate] = exifTime.Format(ListDateFormat)
}
}
return nil
}
// Save updated image - aply if any new exif data, crop and ajusts
func (p *Photo) SaveUpdatedImage(srcURI, dstURU fyne.URI) error {
srcFile, err := os.Open(srcURI.Path())
if err != nil {
return err
}
defer srcFile.Close()
dstFile, err := os.Create(dstURU.Path())
if err != nil {
return err
}
defer dstFile.Close()
exifData, err := getExif(srcFile)
if err != nil {
return err
}
if p.isDated() {
newDate, _ := time.Parse(ListDateFormat, p.Dates[p.DateUsed])
exifData.SetDateTime(newDate)
}
if !p.isCropped() || !p.isAdjusted() {
return exif.Copy(dstFile, srcFile, exifData)
}
tmpFile, err := os.CreateTemp("", "*")
if err != nil {
return err
}
defer tmpFile.Close()
Img, err := imaging.Decode(srcFile, imaging.AutoOrientation(true))
if err != nil {
return err
}
if p.isCropped() {
Img = imaging.Crop(Img, p.CropRectangle)
}
for i, a := range p.Adjust {
if a != adjustFiltersDict[i].zero {
Img = adjustFiltersDict[i].adjust(Img, a)
}
}
err = imaging.Encode(tmpFile, Img, imaging.JPEG, imaging.JPEGQuality(92))
if err != nil {
return err
}
tmpFile.Seek(0, io.SeekStart)
return exif.Copy(dstFile, tmpFile, exifData)
}
func getExif(src io.ReadSeeker) (*exif.Exif, error) {
defer src.Seek(0, io.SeekStart)
// Decode the existing EXIF metadata
src.Seek(0, io.SeekStart)
exifData, err := exif.Decode(src)
if err != nil && err != exif.NotFound {
return nil, err
}
// If no existing EXIF data, create a new instance
if err == exif.NotFound {
src.Seek(0, io.SeekStart)
c, _, err := image.DecodeConfig(src)
if err != nil {
return nil, err
}
exifData = exif.New(c.Width, c.Height)
exifData.SetDateTime(time.Now())
}
return exifData, nil
}
// Convert list date format to display date
func listDateToDisplayDate(listDate string) string {
return convertDate(ListDateFormat, a.state.DisplayDateFormat, listDate)
}
// Convert list date format to file name date
func listDateToFileNameDate(listDate string) string {
return convertDate(ListDateFormat, FileNameDateFormat, listDate)
}
// Convert display date to list date format
func displayDateToListDate(displayDate string) string {
return convertDate(a.state.DisplayDateFormat, ListDateFormat, displayDate)
}
// Convert a date from one string format to another string format.
func convertDate(from, to, date string) string {
t, err := time.Parse(from, date)
if err != nil {
return ""
}
return t.Format(to)
}