Add vips png->webp conversion, and configurable jpeg quality (#914)

pkg/image/resize_unix.go

@@ -7,6 +7,7 @@ import (
 	"math"
 
 	"github.com/davidbyttow/govips/v2/vips"
+	"github.com/stashapp/stash-box/pkg/manager/config"
 )
 
 func Resize(reader io.Reader, maxSize int) ([]byte, error) {
@@ -26,9 +27,20 @@ func Resize(reader io.Reader, maxSize int) ([]byte, error) {
 		}
 	}
 
+	format := image.Format()
+
+	if format == vips.ImageTypePNG {
+		ep := vips.NewWebpExportParams()
+		ep.StripMetadata = true
+		ep.Lossless = true
+
+		imageBytes, _, err := image.ExportWebp(ep)
+		return imageBytes, err
+	}
+
 	ep := vips.NewJpegExportParams()
 	ep.StripMetadata = true
-	ep.Quality = 80
+	ep.Quality = config.GetImageJpegQuality()
 	ep.Interlace = true
 	ep.OptimizeCoding = true
 	ep.SubsampleMode = vips.VipsForeignSubsampleAuto

pkg/image/utils.go

@@ -18,6 +18,7 @@ import (
 	"github.com/disintegration/imaging"
 	issvg "github.com/h2non/go-is-svg"
 
+	"github.com/stashapp/stash-box/pkg/manager/config"
 	"github.com/stashapp/stash-box/pkg/models"
 )
 
@@ -81,7 +82,7 @@ func resizeImage(srcReader io.Reader, maxDimension int64) ([]byte, error) {
 		}
 	} else {
 		options := jpeg.Options{
-			Quality: 90,
+			Quality: config.GetImageJpegQuality(),
 		}
 		err = jpeg.Encode(buf, resizedImage, &options)
 		if err != nil {

pkg/manager/config/config.go

@@ -77,10 +77,11 @@ type config struct {
 	HostURL   string `mapstructure:"host_url"`
 
 	// Image storage settings
-	ImageLocation string `mapstructure:"image_location"`
-	ImageBackend  string `mapstructure:"image_backend"`
-	FaviconPath   string `mapstructure:"favicon_path"`
-	ImageMaxSize  int    `mapstructure:"image_max_size"`
+	ImageLocation    string `mapstructure:"image_location"`
+	ImageBackend     string `mapstructure:"image_backend"`
+	FaviconPath      string `mapstructure:"favicon_path"`
+	ImageMaxSize     int    `mapstructure:"image_max_size"`
+	ImageJpegQuality int    `mapstructure:"image_jpeg_quality"`
 
 	// Logging options
 	LogFile     string `mapstructure:"logFile"`
@@ -279,6 +280,13 @@ func GetImageMaxSize() *int {
 	return &size
 }
 
+func GetImageJpegQuality() int {
+	if C.ImageJpegQuality <= 0 || C.ImageJpegQuality > 100 {
+		return 75
+	}
+	return C.ImageJpegQuality
+}
+
 // GetLogFile returns the filename of the file to output logs to.
 // An empty string means that file logging will be disabled.
 func GetLogFile() string {