use a library for better image orientation handling

cmd/cli/cli.go

@@ -9,7 +9,6 @@ import (
 
 	"image"
 	"image/jpeg"
-	"image/png"
 	"io"
 	"mime"
 	"mime/multipart"
@@ -20,7 +19,7 @@ import (
 	"strings"
 	"time"
 
-	"github.com/nfnt/resize"
+	"github.com/disintegration/imaging"
 	"github.com/urfave/cli/v2"
 )
 
@@ -149,28 +148,10 @@ func cleanUpTempFile(fileLocation string) error {
 
 func resizeImage(fileLocation string, format string) (string, error) {
 	// load the image
-	file, err := os.Open(fileLocation)
-	if err != nil {
-		return "", fmt.Errorf("error opening file | %w", err)
-	}
-	defer file.Close()
-
 	var img image.Image
-	fileMimeType := mime.TypeByExtension(path.Ext(fileLocation))
-	if fileMimeType == "image/jpeg" {
-		// decode the image
-		img, err = jpeg.Decode(file)
-		if err != nil {
-			return "", fmt.Errorf("error decoding jpeg image | %w", err)
-		}
-	} else if fileMimeType == "image/png" {
-		// decode the image
-		img, err = png.Decode(file)
-		if err != nil {
-			return "", fmt.Errorf("error decoding png image | %w", err)
-		}
-	} else {
-		return "", fmt.Errorf("unsupported file type | %v", fileMimeType)
+	img, err := imaging.Open(fileLocation, imaging.AutoOrientation(true))
+	if err != nil {
+		return "", fmt.Errorf("error opening image | %w", err)
 	}
 
 	// check if the image is already the correct size
@@ -202,47 +183,7 @@ func resizeImage(fileLocation string, format string) (string, error) {
 		y1 = 768
 	}
 
-	inFormat := "wide"
-	if width < height {
-		inFormat = "tall"
-	}
-	if width == height {
-		inFormat = "square"
-	}
-
-	// if not, resize the image
-	// scale the original image to the new size
-	var resizedImage image.Image
-	if format == "wide" {
-		resizedImage = resize.Resize(uint(x1), 0, img, resize.Lanczos3)
-	}
-	if format == "tall" {
-		resizedImage = resize.Resize(0, uint(y1), img, resize.Lanczos3)
-	}
-	if format == "square" {
-		if inFormat == "wide" {
-			resizedImage = resize.Resize(0, uint(y1), img, resize.Lanczos3)
-		}
-		if inFormat == "tall" {
-			resizedImage = resize.Resize(uint(x1), 0, img, resize.Lanczos3)
-		}
-		if inFormat == "square" {
-			resizedImage = resize.Resize(uint(x1), uint(y1), img, resize.Lanczos3)
-		}
-	}
-
-	// crop the image to the final correct size
-
-	// start by getting the center of the image
-	tempBounds := resizedImage.Bounds()
-	x0 := tempBounds.Max.X/2 - x1/2
-	y0 := tempBounds.Max.Y/2 - y1/2
-	xMax := x0 + x1
-	yMax := y0 + y1
-
-	croppedImageRect := image.Rect(x0, y0, xMax, yMax)
-	rgba := convertToRGBA(resizedImage)
-	croppedImage := rgba.SubImage(croppedImageRect)
+	croppedImage := imaging.Fill(img, x1, y1, imaging.Center, imaging.Lanczos)
 
 	// save the image to a temp file
 	tempFile, err := os.CreateTemp("", "i2v*"+path.Ext(fileLocation))