219 lines
4.7 KiB
Go
219 lines
4.7 KiB
Go
package scanner
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import (
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"database/sql"
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"image"
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"image/jpeg"
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"os"
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"github.com/disintegration/imaging"
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"github.com/pkg/errors"
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"github.com/viktorstrate/photoview/api/graphql/models"
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"github.com/viktorstrate/photoview/api/utils"
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)
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type PhotoDimensions struct {
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Width int
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Height int
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}
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func PhotoDimensionsFromRect(rect image.Rectangle) PhotoDimensions {
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return PhotoDimensions{
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Width: rect.Bounds().Max.X,
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Height: rect.Bounds().Max.Y,
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}
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}
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func (dimensions *PhotoDimensions) ThumbnailScale() PhotoDimensions {
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aspect := float64(dimensions.Width) / float64(dimensions.Height)
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var width, height int
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if aspect > 1 {
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width = 1024
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height = int(1024 / aspect)
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} else {
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width = int(1024 * aspect)
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height = 1024
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}
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return PhotoDimensions{
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Width: width,
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Height: height,
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}
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}
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// EncodeImageData is used to easily decode image data, with a cache so expensive operations are not repeated
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type EncodeImageData struct {
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photo *models.Photo
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_photoImage image.Image
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_thumbnailImage image.Image
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_contentType *MediaType
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}
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func EncodeImageJPEG(image image.Image, outputPath string, jpegQuality int) error {
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photo_file, err := os.Create(outputPath)
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if err != nil {
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return errors.Wrapf(err, "could not create file: %s", outputPath)
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}
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defer photo_file.Close()
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err = jpeg.Encode(photo_file, image, &jpeg.Options{Quality: jpegQuality})
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if err != nil {
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return err
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}
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return nil
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}
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func GetPhotoDimensions(imagePath string) (*PhotoDimensions, error) {
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photoFile, err := os.Open(imagePath)
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if err != nil {
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return nil, err
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}
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defer photoFile.Close()
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config, _, err := image.DecodeConfig(photoFile)
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if err != nil {
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return nil, err
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}
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return &PhotoDimensions{
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Width: config.Width,
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Height: config.Height,
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}, nil
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}
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// ContentType reads the image to determine its content type
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func (img *EncodeImageData) ContentType() (*MediaType, error) {
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if img._contentType != nil {
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return img._contentType, nil
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}
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imgType, err := getImageType(img.photo.Path)
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if err != nil {
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return nil, err
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}
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img._contentType = imgType
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return imgType, nil
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}
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func (img *EncodeImageData) EncodeHighRes(tx *sql.Tx, outputPath string) error {
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contentType, err := img.ContentType()
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if err != nil {
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return err
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}
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if !contentType.isSupported() {
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return errors.New("could not convert photo as file format is not supported")
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}
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if contentType.isRaw() {
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if DarktableCli.IsInstalled() {
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err := DarktableCli.EncodeJpeg(img.photo.Path, outputPath, 70)
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if err != nil {
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return err
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}
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} else {
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return errors.New("could not convert photo as no RAW converter was found")
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}
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} else {
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image, err := img.photoImage(tx)
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if err != nil {
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return err
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}
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EncodeImageJPEG(image, outputPath, 70)
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}
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return nil
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}
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func EncodeThumbnail(inputPath string, outputPath string) (*PhotoDimensions, error) {
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inputFile, err := os.Open(inputPath)
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if err != nil {
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return nil, err
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}
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defer inputFile.Close()
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inputImage, _, err := image.Decode(inputFile)
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if err != nil {
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return nil, err
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}
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dimensions := PhotoDimensionsFromRect(inputImage.Bounds())
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dimensions = dimensions.ThumbnailScale()
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thumbImage := imaging.Resize(inputImage, dimensions.Width, dimensions.Height, imaging.NearestNeighbor)
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if err = EncodeImageJPEG(thumbImage, outputPath, 60); err != nil {
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return nil, err
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}
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return &dimensions, nil
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}
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// PhotoImage reads and decodes the image file and saves it in a cache so the photo in only decoded once
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func (img *EncodeImageData) photoImage(tx *sql.Tx) (image.Image, error) {
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if img._photoImage != nil {
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return img._photoImage, nil
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}
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photoFile, err := os.Open(img.photo.Path)
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if err != nil {
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return nil, err
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}
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defer photoFile.Close()
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photoImg, _, err := image.Decode(photoFile)
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if err != nil {
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return nil, utils.HandleError("image decoding", err)
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}
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// Get orientation from exif data
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row := tx.QueryRow("SELECT photo_exif.orientation FROM photo JOIN photo_exif WHERE photo.exif_id = photo_exif.exif_id AND photo.photo_id = ?", img.photo.PhotoID)
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var orientation *int
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if err = row.Scan(&orientation); err != nil {
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// If not found use default orientation (not rotate)
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if err == sql.ErrNoRows {
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orientation = nil
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} else {
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return nil, err
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}
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}
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if orientation == nil {
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defaultOrientation := 0
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orientation = &defaultOrientation
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}
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switch *orientation {
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case 2:
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photoImg = imaging.FlipH(photoImg)
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break
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case 3:
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photoImg = imaging.Rotate180(photoImg)
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break
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case 4:
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photoImg = imaging.FlipV(photoImg)
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break
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case 5:
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photoImg = imaging.Transpose(photoImg)
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break
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case 6:
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photoImg = imaging.Rotate270(photoImg)
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break
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case 7:
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photoImg = imaging.Transverse(photoImg)
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break
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case 8:
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photoImg = imaging.Rotate90(photoImg)
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break
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default:
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break
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}
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img._photoImage = photoImg
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return img._photoImage, nil
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}
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