缩略图生成器支持 LibRaw (#2109)

* feat: 增加 LibRaw 缩略图生成器。

* feat: 生成 RAW 图像的缩略图时,旋转缩略图的方向。

* update: RAW 缩略图支持镜像方向。
master
sam 2 months ago committed by GitHub
parent 23d009d611
commit 12e3f10ad7
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@ -121,6 +121,9 @@ Neue',Helvetica,Arial,sans-serif; box-sizing: border-box; font-size: 14px; verti
{Name: "thumb_proxy_enabled", Value: "0", Type: "thumb"},
{Name: "thumb_proxy_policy", Value: "[]", Type: "thumb"},
{Name: "thumb_max_src_size", Value: "31457280", Type: "thumb"},
{Name: "thumb_libraw_path", Value: "simple_dcraw", Type: "thumb"},
{Name: "thumb_libraw_enabled", Value: "0", Type: "thumb"},
{Name: "thumb_libraw_exts", Value: "arw,raf,dng", Type: "thumb"},
{Name: "pwa_small_icon", Value: "/static/img/favicon.ico", Type: "pwa"},
{Name: "pwa_medium_icon", Value: "/static/img/logo192.png", Type: "pwa"},
{Name: "pwa_large_icon", Value: "/static/img/logo512.png", Type: "pwa"},

@ -145,6 +145,7 @@ func (fs *FileSystem) generateThumbnail(ctx context.Context, file *model.File) e
"thumb_vips_enabled",
"thumb_ffmpeg_enabled",
"thumb_libreoffice_enabled",
"thumb_libraw_enabled",
))
if err != nil {
_ = updateThumbStatus(file, model.ThumbStatusNotAvailable)

@ -0,0 +1,283 @@
package thumb
import (
"bytes"
"context"
"errors"
"fmt"
"image"
"image/jpeg"
"image/png"
"io"
"os"
"os/exec"
"path/filepath"
"strings"
model "github.com/cloudreve/Cloudreve/v3/models"
"github.com/cloudreve/Cloudreve/v3/pkg/util"
"github.com/gofrs/uuid"
)
func init() {
RegisterGenerator(&LibRawGenerator{})
}
type LibRawGenerator struct {
exts []string
lastRawExts string
}
func (f *LibRawGenerator) Generate(ctx context.Context, file io.Reader, _ string, name string, options map[string]string) (*Result, error) {
const (
thumbLibRawPath = "thumb_libraw_path"
thumbLibRawExt = "thumb_libraw_exts"
thumbTempPath = "temp_path"
)
opts := model.GetSettingByNames(thumbLibRawPath, thumbLibRawExt, thumbTempPath)
if f.lastRawExts != opts[thumbLibRawExt] {
f.exts = strings.Split(opts[thumbLibRawExt], ",")
f.lastRawExts = opts[thumbLibRawExt]
}
if !util.IsInExtensionList(f.exts, name) {
return nil, fmt.Errorf("unsupported image format: %w", ErrPassThrough)
}
inputFilePath := filepath.Join(
util.RelativePath(opts[thumbTempPath]),
"thumb",
fmt.Sprintf("thumb_%s", uuid.Must(uuid.NewV4()).String()),
)
defer func() { _ = os.Remove(inputFilePath) }()
inputFile, err := util.CreatNestedFile(inputFilePath)
if err != nil {
return nil, fmt.Errorf("failed to create temp file: %w", err)
}
if _, err = io.Copy(inputFile, file); err != nil {
_ = inputFile.Close()
return nil, fmt.Errorf("failed to write input file: %w", err)
}
_ = inputFile.Close()
cmd := exec.CommandContext(ctx, opts[thumbLibRawPath], "-e", inputFilePath)
var stdErr bytes.Buffer
cmd.Stderr = &stdErr
if err = cmd.Run(); err != nil {
util.Log().Warning("Failed to invoke LibRaw: %s", stdErr.String())
return nil, fmt.Errorf("failed to invoke LibRaw: %w", err)
}
outputFilePath := inputFilePath + ".thumb.jpg"
defer func() { _ = os.Remove(outputFilePath) }()
ff, err := os.Open(outputFilePath)
if err != nil {
return nil, fmt.Errorf("failed to open temp file: %w", err)
}
defer func() { _ = ff.Close() }()
// use builtin generator
result, err := new(Builtin).Generate(ctx, ff, outputFilePath, filepath.Base(outputFilePath), options)
if err != nil {
return nil, fmt.Errorf("failed to generate thumbnail: %w", err)
}
orientation, err := getJpegOrientation(outputFilePath)
if err != nil {
return nil, fmt.Errorf("failed to get jpeg orientation: %w", err)
}
if orientation == 1 {
return result, nil
}
if err = rotateImg(result.Path, orientation); err != nil {
return nil, fmt.Errorf("failed to rotate image: %w", err)
}
return result, nil
}
func rotateImg(filePath string, orientation int) error {
resultImg, err := os.OpenFile(filePath, os.O_RDWR, 0777)
if err != nil {
return err
}
defer func() { _ = resultImg.Close() }()
imgFlag := make([]byte, 3)
if _, err = io.ReadFull(resultImg, imgFlag); err != nil {
return err
}
if _, err = resultImg.Seek(0, 0); err != nil {
return err
}
var img image.Image
if bytes.Equal(imgFlag, []byte{0xFF, 0xD8, 0xFF}) {
img, err = jpeg.Decode(resultImg)
} else {
img, err = png.Decode(resultImg)
}
if err != nil {
return err
}
switch orientation {
case 8:
img = rotate90(img)
case 3:
img = rotate90(rotate90(img))
case 6:
img = rotate90(rotate90(rotate90(img)))
case 2:
img = mirrorImg(img)
case 7:
img = rotate90(mirrorImg(img))
case 4:
img = rotate90(rotate90(mirrorImg(img)))
case 5:
img = rotate90(rotate90(rotate90(mirrorImg(img))))
}
if err = resultImg.Truncate(0); err != nil {
return err
}
if _, err = resultImg.Seek(0, 0); err != nil {
return err
}
if bytes.Equal(imgFlag, []byte{0xFF, 0xD8, 0xFF}) {
return jpeg.Encode(resultImg, img, nil)
}
return png.Encode(resultImg, img)
}
func getJpegOrientation(fileName string) (int, error) {
f, err := os.Open(fileName)
if err != nil {
return 0, err
}
defer func() { _ = f.Close() }()
header := make([]byte, 6)
defer func() { header = nil }()
if _, err = io.ReadFull(f, header); err != nil {
return 0, err
}
// jpeg format header
if !bytes.Equal(header[:3], []byte{0xFF, 0xD8, 0xFF}) {
return 0, errors.New("not a jpeg")
}
// not a APP1 marker
if header[3] != 0xE1 {
return 1, nil
}
// exif data total length
totalLen := int(header[4])<<8 + int(header[5]) - 2
buf := make([]byte, totalLen)
defer func() { buf = nil }()
if _, err = io.ReadFull(f, buf); err != nil {
return 0, err
}
// remove Exif identifier code
buf = buf[6:]
// byte order
parse16, parse32, err := initParseMethod(buf[:2])
if err != nil {
return 0, err
}
// version
_ = buf[2:4]
// first IFD offset
offset := parse32(buf[4:8])
// first DE offset
offset += 2
buf = buf[offset:]
const (
orientationTag = 0x112
deEntryLength = 12
)
for len(buf) > deEntryLength {
tag := parse16(buf[:2])
if tag == orientationTag {
return int(parse32(buf[8:12])), nil
}
buf = buf[deEntryLength:]
}
return 0, errors.New("orientation not found")
}
func initParseMethod(buf []byte) (func([]byte) int16, func([]byte) int32, error) {
if bytes.Equal(buf, []byte{0x49, 0x49}) {
return littleEndian16, littleEndian32, nil
}
if bytes.Equal(buf, []byte{0x4D, 0x4D}) {
return bigEndian16, bigEndian32, nil
}
return nil, nil, errors.New("invalid byte order")
}
func littleEndian16(buf []byte) int16 {
return int16(buf[0]) | int16(buf[1])<<8
}
func bigEndian16(buf []byte) int16 {
return int16(buf[1]) | int16(buf[0])<<8
}
func littleEndian32(buf []byte) int32 {
return int32(buf[0]) | int32(buf[1])<<8 | int32(buf[2])<<16 | int32(buf[3])<<24
}
func bigEndian32(buf []byte) int32 {
return int32(buf[3]) | int32(buf[2])<<8 | int32(buf[1])<<16 | int32(buf[0])<<24
}
func rotate90(img image.Image) image.Image {
bounds := img.Bounds()
width, height := bounds.Dx(), bounds.Dy()
newImg := image.NewRGBA(image.Rect(0, 0, height, width))
for x := 0; x < width; x++ {
for y := 0; y < height; y++ {
newImg.Set(y, width-x-1, img.At(x, y))
}
}
return newImg
}
func mirrorImg(img image.Image) image.Image {
bounds := img.Bounds()
width, height := bounds.Dx(), bounds.Dy()
newImg := image.NewRGBA(image.Rect(0, 0, width, height))
for x := 0; x < width; x++ {
for y := 0; y < height; y++ {
newImg.Set(width-x-1, y, img.At(x, y))
}
}
return newImg
}
func (f *LibRawGenerator) Priority() int {
return 250
}
func (f *LibRawGenerator) EnableFlag() string {
return "thumb_libraw_enabled"
}
var _ Generator = (*LibRawGenerator)(nil)

@ -23,6 +23,8 @@ func TestGenerator(ctx context.Context, name, executable string) (string, error)
return testFfmpegGenerator(ctx, executable)
case "libreOffice":
return testLibreOfficeGenerator(ctx, executable)
case "libRaw":
return testLibRawGenerator(ctx, executable)
default:
return "", ErrUnknownGenerator
}
@ -72,3 +74,18 @@ func testLibreOfficeGenerator(ctx context.Context, executable string) (string, e
return output.String(), nil
}
func testLibRawGenerator(ctx context.Context, executable string) (string, error) {
cmd := exec.CommandContext(ctx, executable)
var output bytes.Buffer
cmd.Stdout = &output
if err := cmd.Run(); err != nil {
return "", fmt.Errorf("failed to invoke libraw executable: %w", err)
}
if !strings.Contains(output.String(), "LibRaw") {
return "", ErrUnknownOutput
}
return output.String(), nil
}

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