144 lines
3.7 KiB
Go
144 lines
3.7 KiB
Go
package thumb
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import (
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"errors"
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"fmt"
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"image"
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"image/png"
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"os"
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"path"
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"path/filepath"
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"github.com/photoprism/photoprism/pkg/fs"
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"github.com/photoprism/photoprism/pkg/txt"
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"github.com/disintegration/imaging"
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)
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// Suffix returns the thumb cache file suffix.
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func Suffix(width, height int, opts ...ResampleOption) (result string) {
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method, _, format := ResampleOptions(opts...)
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result = fmt.Sprintf("%dx%d_%s.%s", width, height, ResampleMethods[method], format)
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return result
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}
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// FileName returns the thumb cache file name based on path, size, and options.
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func FileName(hash string, thumbPath string, width, height int, opts ...ResampleOption) (fileName string, err error) {
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if InvalidSize(width) {
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return "", fmt.Errorf("resample: width exceeds limit (%d)", width)
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}
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if InvalidSize(height) {
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return "", fmt.Errorf("resample: height exceeds limit (%d)", height)
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}
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if len(hash) < 4 {
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return "", fmt.Errorf("resample: file hash is empty or too short (%s)", txt.Quote(hash))
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}
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if len(thumbPath) == 0 {
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return "", errors.New("resample: folder is empty")
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}
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suffix := Suffix(width, height, opts...)
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p := path.Join(thumbPath, hash[0:1], hash[1:2], hash[2:3])
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if err := os.MkdirAll(p, os.ModePerm); err != nil {
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return "", err
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}
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fileName = fmt.Sprintf("%s/%s_%s", p, hash, suffix)
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return fileName, nil
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}
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// FromCache returns the thumb cache file name for an image.
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func FromCache(imageFilename, hash, thumbPath string, width, height int, opts ...ResampleOption) (fileName string, err error) {
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if len(hash) < 4 {
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return "", fmt.Errorf("resample: invalid file hash %s", txt.Quote(hash))
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}
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if len(imageFilename) < 4 {
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return "", fmt.Errorf("resample: invalid file name %s", txt.Quote(imageFilename))
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}
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fileName, err = FileName(hash, thumbPath, width, height, opts...)
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if err != nil {
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log.Error(err)
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return "", err
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}
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if fs.FileExists(fileName) {
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return fileName, nil
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}
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return "", ErrThumbNotCached
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}
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// FromFile returns the thumb cache file name for an image, and creates it if needed.
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func FromFile(imageFilename, hash, thumbPath string, width, height, orientation int, opts ...ResampleOption) (fileName string, err error) {
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if fileName, err := FromCache(imageFilename, hash, thumbPath, width, height, opts...); err == nil {
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return fileName, err
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} else if err != ErrThumbNotCached {
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return "", err
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}
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fileName, err = FileName(hash, thumbPath, width, height, opts...)
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if err != nil {
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log.Error(err)
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return "", err
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}
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img, err := imaging.Open(imageFilename)
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if err != nil {
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log.Errorf("resample: %s in %s", err, txt.Quote(filepath.Base(imageFilename)))
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return "", err
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}
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if orientation > 1 {
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img = Rotate(img, orientation)
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}
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if _, err := Create(img, fileName, width, height, opts...); err != nil {
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return "", err
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}
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return fileName, nil
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}
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// Create creates an image thumbnail.
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func Create(img image.Image, fileName string, width, height int, opts ...ResampleOption) (result image.Image, err error) {
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if InvalidSize(width) {
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return img, fmt.Errorf("resample: width has an invalid value (%d)", width)
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}
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if InvalidSize(height) {
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return img, fmt.Errorf("resample: height has an invalid value (%d)", height)
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}
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result = Resample(img, width, height, opts...)
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var saveOption imaging.EncodeOption
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if filepath.Ext(fileName) == "."+string(fs.FormatPng) {
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saveOption = imaging.PNGCompressionLevel(png.DefaultCompression)
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} else if width <= 150 && height <= 150 {
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saveOption = imaging.JPEGQuality(JpegQualitySmall)
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} else {
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saveOption = imaging.JPEGQuality(JpegQuality)
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}
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err = imaging.Save(result, fileName, saveOption)
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if err != nil {
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log.Errorf("resample: failed to save %s", txt.Quote(filepath.Base(fileName)))
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return result, err
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}
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return result, nil
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}
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