From e3220b41113825a2185ddcd474f71ef85f3b48c1 Mon Sep 17 00:00:00 2001
From: kagchi <yonuxbot@gmail.com>
Date: Sun, 19 Nov 2023 11:12:44 +0700
Subject: [PATCH] feat: crop larger image

---
 impl/image_resizer/client/image_resizer.go | 55 ++++++++++++++--------
 1 file changed, 36 insertions(+), 19 deletions(-)

diff --git a/impl/image_resizer/client/image_resizer.go b/impl/image_resizer/client/image_resizer.go
index 8b117c9..928b59f 100644
--- a/impl/image_resizer/client/image_resizer.go
+++ b/impl/image_resizer/client/image_resizer.go
@@ -6,6 +6,8 @@ import (
 	"encoding/hex"
 	"errors"
 	"fmt"
+	"math"
+
 	"github.com/davidbyttow/govips/v2/vips"
 	resty "github.com/go-resty/resty/v2"
 )
@@ -23,30 +25,45 @@ type imageResizerClient struct {
 }
 
 func (i imageResizerClient) ResizeImage(image []byte, width, height int) (result []byte, err error) {
-	img, err := vips.NewImageFromBuffer(image)
-	defer img.Close()
-	if err != nil {
-		err = errors.New(fmt.Sprintf("unable to read image: %v", err.Error()))
-		return
-	}
+img, err := vips.NewImageFromBuffer(image)
+    defer img.Close()
+    if err != nil {
+        err = errors.New(fmt.Sprintf("unable to read image: %v", err.Error()))
+        return
+    }
 
-	// Get original size of image
-	originalWidth := float64(img.Width())
-	originalHeight := float64(img.Height())
+    // Get original size of image
+    originalWidth := float64(img.Width())
+    originalHeight := float64(img.Height())
 
-	if err = img.ResizeWithVScale(float64(width)/originalWidth, float64(height)/originalHeight, vips.KernelNearest); err != nil {
-		return
-	}
+    // Calculate scale factors for width and height
+    scaleWidth := float64(width) / originalWidth
+    scaleHeight := float64(height) / originalHeight
 
-	options := vips.NewJpegExportParams()
-	options.Quality = 100
-	result, _, err = img.ExportJpeg(options)
-	if err != nil {
-		err = errors.New(fmt.Sprintf("unable to export image: %v", err))
-		return
+    // Use the smaller scale factor to ensure the entire image fits within the specified dimensions
+    scaleFactor := math.Min(scaleWidth, scaleHeight)
+
+    if originalWidth == originalHeight {
+		if err = img.Resize(scaleFactor, vips.KernelNearest); err != nil {
+			return
+		}
+	} else {
+    	// Crop the image to the specified dimensions while maintaining the aspect ratio
+    	if err = img.SmartCrop(width, height, vips.InterestingCentre); err != nil {
+        	return
+    	}
 	}
 
-	return
+
+    options := vips.NewJpegExportParams()
+    options.Quality = 100
+    result, _, err = img.ExportJpeg(options)
+    if err != nil {
+        err = errors.New(fmt.Sprintf("unable to export image: %v", err))
+        return
+    }
+
+    return
 }
 
 func (i imageResizerClient) GetOriginImage(url string) (result []byte, err error) {