Make filters low-level

processing/apply_filters.go

@@ -2,7 +2,6 @@ package processing
 
 import (
 	"github.com/imgproxy/imgproxy/v3/imagedata"
-	"github.com/imgproxy/imgproxy/v3/imath"
 	"github.com/imgproxy/imgproxy/v3/options"
 	"github.com/imgproxy/imgproxy/v3/vips"
 )
@@ -20,35 +19,7 @@ func applyFilters(pctx *pipelineContext, img *vips.Image, po *options.Processing
 		return err
 	}
 
-	// When image has alpha, we need to premultiply it to get rid of black edges
-	if err := img.Premultiply(); err != nil {
-		return err
-	}
-
-	if po.Blur > 0 {
-		if err := img.Blur(po.Blur); err != nil {
-			return err
-		}
-	}
-
-	if po.Sharpen > 0 {
-		if err := img.Sharpen(po.Sharpen); err != nil {
-			return err
-		}
-	}
-
-	if po.Pixelate > 1 {
-		pixels := imath.Min(po.Pixelate, imath.Min(img.Width(), img.Height()))
-		if err := img.Pixelate(pixels); err != nil {
-			return err
-		}
-	}
-
-	if err := img.Unpremultiply(); err != nil {
-		return err
-	}
-
-	if err := img.CastUchar(); err != nil {
+	if err := img.ApplyFilters(po.Blur, po.Sharpen, po.Pixelate); err != nil {
 		return err
 	}