Initial QSfera import

Server/services/thumbnails/pkg/thumbnail/processor.go

@@ -0,0 +1,51 @@
+package thumbnail
+
+import (
+	"image"
+	"strings"
+
+	"github.com/kovidgoyal/imaging"
+)
+
+// Processor processes the thumbnail by applying different transformations to it.
+type Processor interface {
+	ID() string
+	Process(img image.Image, width, height int, filter imaging.ResampleFilter) image.Image
+}
+
+// DefinableProcessor is the simplest processor, it holds a replaceable image converter function.
+type DefinableProcessor struct {
+	Slug      string
+	Converter func(img image.Image, width, height int, filter imaging.ResampleFilter) image.Image
+}
+
+// ID returns the processor identification.
+func (p DefinableProcessor) ID() string { return p.Slug }
+
+// Process transforms the given image.
+func (p DefinableProcessor) Process(img image.Image, width, height int, filter imaging.ResampleFilter) image.Image {
+	return p.Converter(img, width, height, filter)
+}
+
+// ProcessorFor returns a matching Processor
+func ProcessorFor(id, fileType string) (DefinableProcessor, error) {
+	switch strings.ToLower(id) {
+	case "fit":
+		return DefinableProcessor{Slug: strings.ToLower(id), Converter: imaging.Fit}, nil
+	case "resize":
+		return DefinableProcessor{Slug: strings.ToLower(id), Converter: imaging.Resize}, nil
+	case "fill":
+		return DefinableProcessor{Slug: strings.ToLower(id), Converter: func(img image.Image, width, height int, filter imaging.ResampleFilter) image.Image {
+			return imaging.Fill(img, width, height, imaging.Center, filter)
+		}}, nil
+	case "thumbnail":
+		return DefinableProcessor{Slug: strings.ToLower(id), Converter: imaging.Thumbnail}, nil
+	default:
+		switch strings.ToLower(fileType) {
+		case typeGif:
+			return DefinableProcessor{Converter: imaging.Resize}, nil
+		default:
+			return DefinableProcessor{Converter: imaging.Thumbnail}, nil
+		}
+	}
+}