move auto crop to filters

internal/epub/filters/epub_filters_autocrop.go

@@ -1,21 +1,16 @@
-package epubimageprocessing
+package epubfilters
 
 import (
 	"image"
 	"image/color"
-	"path/filepath"
-	"strings"
+
+	"github.com/disintegration/gift"
 )
 
-// only accept jpg, png and webp as source file
-func isSupportedImage(path string) bool {
-	switch strings.ToLower(filepath.Ext(path)) {
-	case ".jpg", ".jpeg", ".png", ".webp":
-		{
-			return true
-		}
-	}
-	return false
+func AutoCrop(img image.Image, cutRatioLeft, cutRatioUp, cutRatioRight, cutRatioBottom int) gift.Filter {
+	return gift.Crop(
+		findMarging(img, cutRatioOptions{cutRatioLeft, cutRatioUp, cutRatioRight, cutRatioBottom}),
+	)
 }
 
 // check if the color is blank enough

internal/epub/filters/epub_filters_autorotate.go

@@ -1,35 +0,0 @@
-/*
-Rotate image if the source width > height.
-*/
-package epubfilters
-
-import (
-	"image"
-	"image/draw"
-
-	"github.com/disintegration/gift"
-)
-
-func AutoRotate() gift.Filter {
-	return &autoRotateFilter{}
-}
-
-type autoRotateFilter struct {
-}
-
-func (p *autoRotateFilter) Bounds(srcBounds image.Rectangle) (dstBounds image.Rectangle) {
-	if srcBounds.Dx() > srcBounds.Dy() {
-		dstBounds = gift.Rotate90().Bounds(srcBounds)
-	} else {
-		dstBounds = srcBounds
-	}
-	return
-}
-
-func (p *autoRotateFilter) Draw(dst draw.Image, src image.Image, options *gift.Options) {
-	if src.Bounds().Dx() > src.Bounds().Dy() {
-		gift.Rotate90().Draw(dst, src, options)
-	} else {
-		draw.Draw(dst, dst.Bounds(), src, src.Bounds().Min, draw.Src)
-	}
-}

internal/epub/image/epub_image_filters.go

@@ -1,24 +1,38 @@
 package epubimage
 
 import (
+	"image"
+
 	epubfilters "github.com/celogeek/go-comic-converter/v2/internal/epub/filters"
 	"github.com/disintegration/gift"
 )
 
 // create filter to apply to the source
-func NewGift(options *Options) *gift.GIFT {
+func NewGift(img image.Image, options *Options) *gift.GIFT {
 	g := gift.New()
 	g.SetParallelization(false)
 
-	if options.AutoRotate {
-		g.Add(epubfilters.AutoRotate())
+	if options.Crop {
+		g.Add(epubfilters.AutoCrop(
+			img,
+			options.CropRatioLeft,
+			options.CropRatioUp,
+			options.CropRatioRight,
+			options.CropRatioBottom,
+		))
 	}
+	if options.AutoRotate && img.Bounds().Dx() > img.Bounds().Dy() {
+		g.Add(gift.Rotate90())
+	}
+
 	if options.Contrast != 0 {
 		g.Add(gift.Contrast(float32(options.Contrast)))
 	}
+
 	if options.Brightness != 0 {
 		g.Add(gift.Brightness(float32(options.Brightness)))
 	}
+
 	g.Add(
 		epubfilters.Resize(options.ViewWidth, options.ViewHeight, gift.LanczosResampling),
 		epubfilters.Pixel(),

internal/epub/imageprocessing/epub_image_processing.go

@@ -29,6 +29,17 @@ type tasks struct {
 	Name   string
 }
 
+// only accept jpg, png and webp as source file
+func isSupportedImage(path string) bool {
+	switch strings.ToLower(filepath.Ext(path)) {
+	case ".jpg", ".jpeg", ".png", ".webp":
+		{
+			return true
+		}
+	}
+	return false
+}
+
 // extract and convert images
 func LoadImages(o *Options) ([]*epubimage.Image, error) {
 	images := make([]*epubimage.Image, 0)
@@ -101,20 +112,7 @@ func LoadImages(o *Options) ([]*epubimage.Image, error) {
 					os.Exit(1)
 				}
 
-				if o.Image.Crop {
-					g := gift.New(gift.Crop(findMarging(src, cutRatioOptions{
-						Left:   o.Image.CropRatioLeft,
-						Up:     o.Image.CropRatioUp,
-						Right:  o.Image.CropRatioRight,
-						Bottom: o.Image.CropRatioBottom,
-					})))
-					newSrc := image.NewNRGBA(g.Bounds(src.Bounds()))
-					g.Draw(newSrc, src)
-					src = newSrc
-				}
-
-				g := epubimage.NewGift(o.Image)
-
+				g := epubimage.NewGift(src, o.Image)
 				// Convert image
 				dst := image.NewGray(g.Bounds(src.Bounds()))
 				g.Draw(dst, src)