82 lines
2 KiB
Go
82 lines
2 KiB
Go
package thumb
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import (
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"fmt"
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"image"
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"io"
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"os"
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"path/filepath"
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"github.com/disintegration/imaging"
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"github.com/mandykoh/prism/meta"
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"github.com/mandykoh/prism/meta/autometa"
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"github.com/photoprism/photoprism/pkg/clean"
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"github.com/photoprism/photoprism/pkg/colors"
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)
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// decodeImage opens an image and decodes its color metadata.
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func decodeImage(reader io.Reader, logName string) (md *meta.Data, img image.Image, err error) {
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// Read color metadata.
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md, imgStream, err := autometa.Load(reader)
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if err != nil {
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log.Warnf("thumb: %s in %s (read color metadata)", err, logName)
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img, err = imaging.Decode(reader)
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} else {
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img, err = imaging.Decode(imgStream)
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}
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return md, img, err
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}
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// OpenJpeg loads a JPEG image from disk, rotates it, and converts the color profile if necessary.
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func OpenJpeg(fileName string, orientation int) (image.Image, error) {
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if fileName == "" {
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return nil, fmt.Errorf("filename missing")
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}
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logName := clean.Log(filepath.Base(fileName))
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// Open file.
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fileReader, err := os.Open(fileName)
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if err != nil {
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return nil, err
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}
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defer fileReader.Close()
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// Reset file offset.
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// see https://github.com/golang/go/issues/45902#issuecomment-1007953723
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if _, err := fileReader.Seek(0, 0); err != nil {
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return nil, fmt.Errorf("%s on seek", err)
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}
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// Decode image incl color metadata.
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md, img, err := decodeImage(fileReader, logName)
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// Ok?
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if err != nil {
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return nil, fmt.Errorf("%s while decoding", err)
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}
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// Read ICC profile and convert colors if possible.
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if md != nil {
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if iccProfile, err := md.ICCProfile(); err != nil || iccProfile == nil {
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// Do nothing.
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log.Tracef("thumb: %s has no color profile", logName)
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} else if profile, err := iccProfile.Description(); err == nil && profile != "" {
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log.Tracef("thumb: %s has color profile %s", logName, clean.Log(profile))
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switch {
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case colors.ProfileDisplayP3.Equal(profile):
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img = colors.ToSRGB(img, colors.ProfileDisplayP3)
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}
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}
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}
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// Adjust orientation.
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if orientation > 1 {
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img = Rotate(img, orientation)
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}
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return img, nil
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}
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